JP2005117872A - Electric power regeneration device for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electric power regeneration device for a vehicle that makes it possible to regenerate electric power efficiently by utilizing wind power energy. <P>SOLUTION: This invention relates to the electric power regeneration device 1 for a vehicle provided with a fan 10, a rotary electric machine 20, an electric power regeneration circuit 30, and a battery 40. The electric power regeneration circuit 30 starts chopper control on switching elements 35a, 35b, 35c when rotational speed based on rotational speed detection signals outputted from a motor rotational speed detection portion 50 becomes a predetermined first reference speed or larger, stops the chopper control on switching elements 35a, 35b, 35c when rotational speed based on rotational speed detection signals becomes a second reference speed, which is slower than the first reference speed, and is configured to vary the duty ratio of chopper signals that are outputted to the switching elements 35a, 35b, 35c, according to the rotational speed based on the rotational speed detection signals. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle power regeneration device, and more particularly to a vehicle power regeneration device for regenerating power generated by a rotating electrical machine disposed in a vehicle.

Conventionally, vehicles such as an electric vehicle, a hybrid vehicle, and an internal combustion engine vehicle have been provided with a vehicle power regeneration device for regenerating power. This vehicle power regeneration device uses a rotating electrical machine connected to a drive shaft of a vehicle to convert mechanical energy during braking of the vehicle into power, and regenerates this power to charge the battery. ing. In the vehicle, as described above, the power balance of the charging power with respect to the power consumption of the battery is improved by regenerating power using the vehicle power regeneration device and charging the battery (for example, , See Patent Document 1 and Patent Document 2).
Japanese Patent Laid-Open No. 9-23507 (page 6-9, FIG. 1) JP 2002-61512 A (page 4-7, FIG. 1)

However, in the vehicle power regeneration device described in Patent Document 1, mechanical energy obtained from the drive shaft of the vehicle is used to charge the battery, and wind power obtained from the travel wind received while the vehicle travels. Energy was not effectively utilized.
Further, the vehicle power regeneration device described in Patent Document 2 is configured to regenerate the power generation energy by the traveling wind, but the switching of the power regeneration is the rotation of the rotating electrical machine detected by the rotation speed detecting means. It is done according to the speed. However, in general, when a regenerative current starts to flow from the rotating electrical machine to the battery, the regenerative brake works on the rotating electrical machine due to the attraction and repulsive force caused by the magnetic field generated by the voltage induced in the armature winding and the magnetic field generated by the permanent magnet. As a result, the rotational speed of the rotating electrical machine decreases. Therefore, if the configuration is such that power regeneration is performed when the rotational speed exceeds a certain reference value as in the vehicle power regeneration device described in Patent Document 2, the rotational speed of the rotating electrical machine is not sufficient. However, there is a problem that the power regeneration is forcibly terminated due to the regenerative brake acting immediately after the power regeneration is started, so that the rotational speed falls below the reference value. In addition, in the vehicle power regeneration device described in Patent Document 2, a switch unit that is turned on / off by chopper control is provided in a power regeneration circuit that sends power generated by a rotating electrical machine to a battery. It is difficult to say that the duty ratio of the output chopper signal is constant and the power balance is improved.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to make it possible to efficiently regenerate electric power by utilizing wind energy and to improve electric power balance in the vehicle. The object is to provide a regenerative device.

  According to the power regeneration device for a vehicle according to claim 1, the subject is a fan that can be rotated by a traveling wind received while the vehicle is traveling, and a rotating electrical machine that generates electric power as the fan is rotated by the traveling wind. A power regeneration circuit for regenerating power generated by the rotating electrical machine, and a battery for storing the power regenerated by the power regeneration circuit, wherein the rotating electrical machine includes the rotating electrical machine A rotation speed detection unit capable of outputting a rotation speed detection signal corresponding to the rotation speed of the motor, and the power regeneration circuit short-circuits the armature winding of the rotating electrical machine when turned on. A switch unit that induces a voltage in the armature winding when the armature winding is turned off, and a control unit that performs chopper control on the switch unit, the control unit configured to rotate the rotation speed based on the rotation speed detection signal. When the speed becomes equal to or higher than a predetermined first reference speed, the chopper control for the switch unit is started, and the rotation speed based on the rotation speed detection signal is equal to or lower than the second reference speed that is slower than the first reference speed. The chopper control function for stopping the chopper control for the switch unit when the control signal becomes, and the duty ratio variable for varying the duty ratio of the chopper signal output to the switch unit according to the rotation speed based on the rotation speed detection signal It is solved by having a function.

  Thus, in the vehicle power regeneration device of the present invention, the rotating electrical machine is provided with the rotational speed detection unit capable of outputting a rotational speed detection signal corresponding to the rotational speed of the rotating electrical machine, and the power regeneration circuit is turned on. A switch unit that short-circuits the armature winding of the rotating electric machine and induces a voltage in the armature winding when the rotary arm is turned off, and a control unit that performs chopper control on the switch unit. When the rotation speed based on the rotation speed detection signal becomes equal to or higher than a predetermined first reference speed, the chopper control for the switch section is started, and the rotation speed based on the rotation speed detection signal is changed to the first reference speed. A chopper control function is provided to stop chopper control for the switch unit when the speed becomes lower than the second reference speed that is slower than the second reference speed. With this configuration, even if the rotational speed is reduced by the regenerative brake immediately after the start of power regeneration, the rotating electrical machine can continue to operate as a generator until the speed is reduced to the second reference speed. It is possible to prevent the occurrence of a problem that the process ends automatically. As a result, it is possible to efficiently regenerate the electric power generated in the rotating electrical machine by the wind energy, and the power balance in the vehicle can be improved.

  In addition to the chopper control function, the control unit in the vehicle power regeneration device of the present invention includes a duty that varies the duty ratio of the chopper signal output to the switch unit according to the rotation speed based on the rotation speed detection signal. A variable ratio function is provided. With this configuration, for example, by adjusting the duty ratio optimally according to the rotation speed of the rotating electrical machine, it is possible to efficiently flow more regenerative current to the battery while suppressing a decrease in the rotation speed due to the regenerative brake. Therefore, it is possible to further improve the power balance in the vehicle.

  According to a second aspect of the present invention, the duty ratio variable function has a function of increasing the duty ratio of the chopper signal output to the switch unit in response to a decrease in the rotational speed based on the rotational speed detection signal. May be. With such a function, even when the rotational speed of the rotating electrical machine decreases, the duty ratio of the chopper signal output to the switch unit is increased, thereby allowing more regenerative current to flow to the battery. .

  In addition, according to the power regeneration device for a vehicle according to claim 3, the problem is that a fan that can be rotated by traveling wind received by the vehicle during traveling and power is generated along with the rotation of the fan by traveling wind. In a vehicular power regeneration device comprising: a rotating electrical machine; a power regeneration circuit that regenerates power generated by the rotating electrical machine; and a battery that accumulates the power regenerated by the power regeneration circuit. The power regeneration circuit includes a rotational speed detection unit capable of outputting a rotational speed detection signal corresponding to the rotational speed of the rotating electrical machine, and the power regeneration circuit outputs a regenerative current detection signal corresponding to the amount of regenerative current flowing from the rotating electrical machine. A regenerative current detecting unit capable of short-circuiting the armature winding of the rotating electrical machine when turned on and a switch unit for inducing a voltage in the armature winding when turned off; A control unit that chopper-controls the switch unit, and the control unit is configured to switch the switch unit when a rotation speed based on the rotation speed detection signal is equal to or higher than a predetermined first reference speed. And a chopper control function for stopping chopper control for the switch unit when a rotation speed based on the rotation speed detection signal is equal to or lower than a second reference speed lower than the first reference speed. This is solved by having a duty ratio variable function for varying the duty ratio of the chopper signal output to the switch unit in accordance with the amount of regenerative current based on the regenerative current detection signal.

  Thus, in the vehicle power regeneration device of the present invention, the rotating electrical machine is provided with a rotational speed detection unit capable of outputting a rotational speed detection signal corresponding to the rotational speed of the rotating electrical machine. A regenerative current detector that can output a regenerative current detection signal corresponding to the amount of regenerative current that flows, and an armature winding that shorts the armature winding of the rotating electrical machine when turned on and turns off the armature winding And a control unit that chopper-controls the switch unit, and the control unit detects when the rotation speed based on the rotation speed detection signal is equal to or higher than a predetermined first reference speed. The chopper control for the switch unit is started when the rotation speed based on the rotation speed detection signal becomes equal to or lower than the second reference speed which is lower than the first reference speed. And it has a configuration including a chopper control function to stop. With this configuration, even if the rotational speed is reduced by the regenerative brake immediately after the start of power regeneration, the rotating electrical machine can continue to operate as a generator until the speed is reduced to the second reference speed. It is possible to prevent the occurrence of a problem that the process ends automatically. As a result, it is possible to efficiently regenerate the electric power generated in the rotating electrical machine by the wind energy, and the power balance in the vehicle can be improved.

  In addition to the chopper control function, the control unit in the vehicle power regeneration device of the present invention varies the duty ratio of the chopper signal output to the switch unit according to the amount of regenerative current based on the regenerative current detection signal. A duty ratio variable function is provided. With this configuration, for example, by adjusting the duty ratio optimally according to the amount of regenerative current flowing from the rotating electrical machine to the battery, more regenerative current can be efficiently flowed to the battery. Can be further improved.

  As described in claim 4, the variable duty ratio function detects a duty ratio that maximizes the amount of regenerative current based on the regenerative current detection signal by varying the duty ratio of the chopper signal output to the switch unit. In addition, a function may be provided in which the duty ratio that maximizes the amount of regenerative current can be set as the duty ratio of the chopper signal output to the switch unit. With such a function, even if the rotation speed of the rotating electrical machine changes, it is possible to set a duty ratio that maximizes the amount of regenerative current following the changing rotation speed, so that more regeneration is possible. An electric current can be passed through the battery.

  In the vehicular power regeneration device according to claim 5, more specifically, the rotating electrical machine is configured by a brushless motor, and the switch unit includes a plurality of upper switching elements and the upper switching elements. An upper arm composed of a plurality of upper diodes connected in parallel to each other and a lower arm composed of a plurality of lower switching elements and a plurality of lower diodes connected in parallel to each of the lower switching elements are bridge-connected. The control unit is configured to chopper-control at least one switching element among the switching elements of the upper arm or the lower arm.

  As described above, when the rotating electrical machine is configured by a brushless motor, motor driving control can be performed with relatively little electric power during motor driving operation, so that motor driving efficiency can be improved. In addition, when the switch unit is configured by a full-wave drive circuit, not only the power can be regenerated, but also the drive control of the motor can be performed, so the drive control circuit for driving the motor separately from the power regeneration circuit Therefore, it is possible to prevent an increase in component costs. Furthermore, since the power generation operation and the step-up chopper operation can be performed simultaneously using the full-wave drive circuit unit, the efficiency of the power regeneration operation can be further improved.

  According to the sixth aspect of the present invention, in the power regeneration device for a vehicle, the rotating electrical machine is configured by a brushless motor, and the switch unit is connected in parallel to each of the plurality of switching elements and the switching elements. The control unit may include a half-wave drive circuit including a plurality of diodes, and the control unit may be configured to chopper-control at least one switching element among the plurality of switching elements. Even in such a configuration, the half-wave drive circuit not only regenerates power, but also can perform drive control of the motor, so drive control for driving the motor separately from the power regeneration circuit There is no need to provide a circuit, which makes it possible to prevent an increase in component costs. Further, since the power generation operation and the step-up chopper operation can be performed simultaneously using the half-wave drive circuit, the efficiency of the power regeneration operation can be further improved.

  In the vehicular power regeneration device according to claim 7, the fan is more preferably constituted by a radiator cooling fan for cooling a radiator provided in the vehicle, The radiator cooling fan is configured by a fan motor disposed in the vehicle for rotationally driving the radiator cooling fan. If comprised in this way, since the existing equipment in a vehicle can be used for this electric power regeneration device for vehicles, it becomes possible to hold down the cost increase of the vehicle by having added the equipment for electric power regeneration low. .

  Further, as described in claim 8, in the vehicle power regeneration device, the fan is configured by a blower fan for a vehicle air conditioner disposed in the vehicle, and the rotating electrical machine includes a blower fan for blower. You may comprise with the blower motor arrange | positioned in the vehicle in order to drive it to rotate. Even if configured in this way, since the existing equipment in the vehicle can be used for the power regeneration device for the vehicle, it is possible to suppress the increase in the cost of the vehicle due to the addition of equipment for power regeneration. Become.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. It should be noted that members, arrangements, and the like described below do not limit the present invention, and it goes without saying that various modifications can be made in accordance with the spirit of the present invention.

(First embodiment)
FIG. 1 to FIG. 7 are views showing a first embodiment of the present invention, FIG. 1 is a block diagram showing an overall configuration of a vehicle power regeneration device, and FIG. 2 shows a state in which the vehicle power regeneration device is mounted on a vehicle. FIG. 3 is an explanatory diagram showing the electrical configuration of the vehicle power regeneration device, FIG. 4 is a flowchart showing the operation of the vehicle power regeneration device, and FIG. 5 is the start or end of power regeneration in the vehicle power regeneration device. FIG. 6 is an explanatory diagram showing a relationship between the motor rotational speed and the duty ratio in the vehicle power regeneration device, and FIG. 7 is an explanatory diagram showing a chopper signal in the vehicle power regeneration device. is there.

A vehicle power regeneration device 1 according to the first embodiment of the present invention shown in FIG. 1 is for regenerating power generated in a vehicle such as a hybrid car or an internal combustion engine automobile, and includes a fan 10 and a rotating electrical machine. As a fan motor 20, a power regeneration circuit 30, a battery 40, a motor rotation speed detector 50, and the like.
As shown in FIG. 2, the fan 10 is, for example, for cooling a radiator 61 mounted in front of the vehicle 60, and includes a rotating shaft 11 and a plurality of radially disposed on the rotating shaft 11. The blade 12 is constituted. The fan 10 is connected to the fan motor 20 and can be rotated by traveling wind received by the vehicle during traveling.
As shown in FIG. 3, the fan motor 20 has a stator 22 on which three-phase star-connected armature windings 21U, 21V, 21W are arranged, and a permanent magnet. And a brushless motor having a rotor 23. The fan 10 is connected to the rotating shaft of the rotor 23, and the rotor 23 can be rotated as the fan 10 rotates. The respective end portions of the armature windings 21U, 21V, and 21W are connected to output terminals 31U, 31V, and 31W of a motor circuit unit 33, which will be described later.

The power regeneration circuit 30 is an electric circuit for rotating the fan motor 20 and regenerating the power generated by the fan motor 20 to the battery 40. As shown in FIGS. , A switching unit 32, a motor circuit unit 33, and a driver 34.
The central control circuit unit 31 is configured by an arithmetic processing circuit including a CPU, a memory, and the like, and is illustrated in the vehicle 60 such as a cooling water temperature sensor (not illustrated) disposed in the radiator 61. The input signal from various sensors that are not to be input and the rotational speed detection signal output from the motor rotational speed detection unit 50 are input so that the motor drive operation signal and the power regeneration operation signal can be output to the switching unit 32. It has become. The central control circuit unit 31 can output a motor drive command signal and a power regeneration command signal to a driver 34 described later via the switching unit 32. The motor drive command signal includes a clock signal for switching the switching elements 35a to 35f at a predetermined period, a drive signal for driving the driver, and the like. The power regeneration command signal includes a signal for changing the duty ratio of the chopper signal output from the driver 34, a signal related to the frequency of the chopper signal, a drive signal for driving the driver, and the like.

The switching unit 32 includes, for example, a switch including a relay switch, a transistor, an FET (field effect transistor), an IGBT (base terminal insulated bipolar transistor), and the like, and a motor drive operation signal or power from the central control circuit unit 31. A circuit switching operation is performed according to the regeneration operation signal, and a motor drive switching signal or a power regeneration switching signal can be output to the driver 34.
In the present embodiment, the switching unit 32 is connected between the central control circuit unit 31 and the driver 34. However, the switching unit 32 may be incorporated in the driver 34. Also, the switching elements 35a to 35f may be connected to the driver 34.

The motor circuit unit 33 includes switching elements 35a, 35b, 35c and diodes 36a, 36b, 36c constituting the upper arm, and switching elements 35d, 35e, 35f and diodes 36d, 36e, 36f constituting the lower arm. It consists of a connected full-wave drive circuit.
The switching elements 35a to 35f are bridge-connected to the three phases U, V, and W between the anode power source line 37 and the cathode power source line 38, and an intermediate portion of each bridge connection portion is an output terminal 31U (U phase). , 31V (V phase) and 31W (W phase), respectively. The bases of the switching elements 35a to 35f are connected to the driver 34, respectively.

  The switching elements 35a, 35b, and 35c can switch supply and stop of current from the anode power supply line 37 to the armature windings 21U, 21V, and 21W, respectively, and the switching element 35d. , 35e, and 35f can switch the flow of current from the armature windings 21U, 21V, and 21W to the cathode power supply line 38. In the present embodiment, transistors are used for the switching elements 35a to 35f. However, FETs (field effect transistors) and IGBTs (base-insulated bipolar transistors) may also be used. The diodes 36a to 36f are composed of rectifying elements that can flow current only in the forward direction, and are connected in parallel to the switching elements 35a to 35f in each bridge connection portion, and from the anode power supply line 37 to the cathode power supply line. The wires are connected so as to be in the opposite direction to the current flow to 38.

  The driver 34 is composed of an IC capable of performing electrical processing in accordance with a predetermined input signal, and enters a motor drive operation standby state and a power regeneration operation standby state in accordance with a switching signal from the switching unit 32. It can be switched. When the driver 34 is in a motor drive operation standby state, it enters a motor drive mode by inputting a motor drive command signal from the central control circuit unit 31, and can operate as a motor drive driver. ing. In addition, when the driver 34 is in a power regeneration operation standby state, the driver 34 enters a power regeneration mode by inputting a power regeneration command signal from the central control circuit unit 31, and can operate as a power regeneration driver. . Then, the driver 34 according to the present example inputs a rotor position detection signal from the motor rotation speed detection unit 50, so that a switching signal and a chopper signal corresponding to the motor driving operation and the power regeneration operation are sent to the switching elements 35a to 35f. It can be output to the base.

The battery 40 is configured by an in-vehicle DC storage battery, and is configured to output a predetermined voltage to the fan motor 20 and to store power regenerated by the power regeneration circuit 30. Moreover, the battery 40 is arrange | positioned in the engine room in which the engine 62 of the vehicle 60 is mounted, as shown in FIG.
The motor rotation speed detection unit 50 includes, for example, position detectors 50U, 50V, and 50W made up of Hall elements and the like integrated into the fan motor 20 shown in FIG. The rotor position detection signal can be output to the driver 34 by detecting a change in the magnetic field emitted from the detection magnet. Further, as shown in FIGS. 1 and 3, the output signal from the motor rotation speed detection unit 50 is also output to the central control circuit unit 31 as a rotation speed detection signal. In the present embodiment, the output signal from the motor rotation speed detection unit 50 is directly output to the central control circuit unit 31, but after the driver 34 performs a predetermined process, It may be output to the control circuit unit 31.

  And by each said structure, the electric power regeneration apparatus 1 for vehicles respond | corresponds to the rotational speed detection signal output from the input signal from the various sensors (not shown) arrange | positioned at the vehicle 60, and the motor rotational speed detection part 50. The operation of driving the fan motor 20 (hereinafter referred to as motor driving operation) and the operation of regenerating power from the fan motor 20 (hereinafter referred to as power regeneration operation) can be switched. Yes. Below, the electric power regeneration operation | movement and motor drive operation | movement of the electric power regeneration apparatus 1 for vehicles which concern on 1st embodiment of this invention are demonstrated.

First, the motor drive operation of the vehicle power regeneration device 1 will be described.
When the central control circuit unit 31 receives detection signals from a cooling water temperature sensor (not shown) disposed in the radiator 61 at predetermined intervals, and determines that the temperature of the cooling water exceeds a specified value. Outputs a motor drive operation signal to the switching unit 32. When the motor driving operation signal output from the central control circuit unit 31 is input, the switching unit 32 performs a circuit switching operation and outputs a motor driving switching signal to the driver 34 so that the current from the battery 40 flows to the fan motor 20. To do. When the driver 34 receives the motor drive switching signal output from the switching unit 32, the driver 34 enters a motor drive operation standby state and waits for an input of a motor drive command signal from the central control circuit unit 31. When the central control circuit unit 31 determines that the radiator 61 should be cooled based on the detection signal from the cooling water temperature sensor, the central control circuit unit 31 outputs a motor drive command signal to the driver 34 via the switching unit 32. .

  When the motor 34 receives the motor drive command signal output from the central control circuit unit 31, the driver 34 enters the motor drive mode, and the motor circuit unit is based on the rotor position detection signals from the position detectors 50U, 50V, 50W. The switching signals are output in a predetermined order from 33 to the bases of the switching elements 35a to 35f. Thus, when the switching signals input to the bases of the switching elements 35a, 35b, and 35c are sequentially switched to the HIGH level according to the position of the rotor 23, the collector-emitter between the switching elements 35a, 35b, and 35c. Are sequentially conducted, the current flowing from the anode of the battery 40 to the anode power supply line 37 flows to the armature windings 21U, 21V, 21W in a predetermined order. Similarly, when the switching signals input to the bases of the switching elements 35d, 35e, and 35f are sequentially switched to the HIGH level according to the position of the rotor 23, the collector-emitters of the switching elements 35d, 35e, and 35f are sequentially connected. Since it is conductive, the current that has flowed through the armature windings 21U, 21V, and 21W flows into the cathode power supply line 38.

  Thus, when a current flows through the armature windings 21U, 21V, and 21W in a predetermined order, the winding in which the current flows out of the armature windings 21U, 21V, and 21W and the permanent magnet of the rotor 23 are changed. Suction and repulsion cause the rotor 23 to rotate at a constant speed, and this rotational force is transmitted to the fan 10 to rotate the fan 10. In the vehicle power regeneration device 1 according to the present embodiment, as described above, by rotating the fan 10, cooling air can be blown to the radiator 61 to cool the radiator 61. Further, in the present embodiment, since the fan motor 20 is configured by a brushless motor, motor drive control can be performed with relatively little power, and motor drive efficiency can be improved.

Next, the power regeneration operation of the vehicle power regeneration device 1 will be described.
The central control circuit unit 31 shown in FIG. 3 inputs a detection signal from a cooling water temperature sensor (not shown) disposed inside the radiator 61 and a signal output from a traveling speed sensor of the vehicle at predetermined intervals, When it is determined that the temperature of the cooling water is below the specified value while the vehicle is running, a power regeneration operation signal is output to the switching unit 32. When the switching unit 32 receives the power regeneration operation signal output from the central control circuit unit 31, the switching unit 32 performs a circuit switching operation and causes the driver 34 to stop the power supply from the battery 40 to the fan motor 20. Is output. As a result, the fan 10 and the fan motor 20 can be rotated by an external force.

  When the driver 34 receives the power regeneration switching signal output from the switching unit 32, the driver 34 enters a power regeneration operation standby state and waits for an input of a power regeneration command signal from the central control circuit unit 31. On the other hand, the central control circuit unit 31 stands by so that a power regeneration command signal can be output to the driver 34 via the switching unit 32. At this time, all the switching signals output from the driver 34 to the bases of the switching elements 35a to 35f are at the LOW level. Here, in FIG. 4, the flowchart showing the electric power regeneration operation | movement of the vehicle electric power regeneration apparatus 1 is shown. Hereinafter, the power regeneration operation of the vehicle power regeneration device 1 will be described with reference to FIG. 4 as appropriate.

  First, when the vehicle 60 travels at a high speed or the like, as shown in FIG. 2, traveling wind flows into the engine room from the front of the vehicle 60, and the traveling wind passes through the radiator 61 and is blown to the fan 10. In this way, when traveling wind is blown onto the fan 10, the fan 10 rotates in the same direction as the rotation direction when the motor is driven. When the fan 10 is rotated by the traveling wind, the rotor 23 of the fan motor 20 shown in FIG. 3 rotates in the same direction as the rotation direction when the motor is driven. At this time, the motor rotation speed detection unit 50 detects the rotation speed of the fan motor 20 and outputs a rotation speed detection signal corresponding to the rotation speed to the driver 34 and the central control circuit unit 31, respectively.

  The central control circuit unit 31 receives a rotation speed detection signal output according to the rotation speed of the fan motor 20 from the motor rotation speed detection unit 50 in the output standby state of the power regeneration command signal. The rotational speed is detected (step S1). Next, the central control circuit unit 31 counts and calculates the input rotation speed detection signal to grasp the rotation speed of the fan motor 20, and this rotation speed is the first reference speed (for example, the rotation speed is 1000 rpm). It is determined whether or not it exceeds (step S2). If the central control circuit unit 31 determines that the rotational speed of the fan motor 20 is still below the first reference speed (step S2: NO), the electric power generated by the fan motor 20 is regenerated. Therefore, the system waits without outputting the power regeneration command signal.

  On the other hand, when the central control circuit unit 31 determines that the rotational speed of the fan motor 20 exceeds the first reference speed (step S2: YES), the electric power generated by the fan motor 20 is sufficient to regenerate. Therefore, the power regeneration command signal is output to the driver 34 via the switching unit 32. And driver 34 will be in power regeneration mode, if power regeneration command signal outputted from central control circuit part 31 is inputted, and will start regeneration of power (Step S3). Here, when the fan 10 receives the traveling wind and the rotor 23 of the fan motor 20 rotates in the same direction as the rotation direction during driving, the permanent magnet disposed on the rotor 23 causes a change in the magnetic field to the stator 22. Given, the magnetic flux penetrating each armature winding 21U, 21V, 21W changes. And the magnetic flux which penetrates each armature winding 21U, 21V, 21W changes, and the induced electromotive force of the polarity which tries to continue flowing a short circuit current through each armature winding 21U, 21V, 21W arises.

  In the state where the rotor 23 is rotating, the switching signals output to the bases of the switching elements 35d, 35e, and 35f in a state where all the switching signals output to the bases of the switching elements 35a, 35b, and 35c are maintained at the LOW level. When all are set to the HIGH level, the collector-emitters of the switching elements 35d, 35e, and 35f become conductive, so that the current caused by the induced voltage generated in the armature windings 21U, 21V, and 21W And then flows to the other armature winding through the armature winding that has generated the original induced electromotive force again as a short-circuit current. This short-circuit current is stored as energy in the armature winding.

  Thereafter, when the switching signal output to the bases of the switching elements 35d, 35e, and 35f is set to the LOW level, the current flowing through the armature winding of a specific phase having a specific positional relationship with the rotor 23 is reduced. In addition, an induced voltage due to the self-inductive action in the armature winding is applied to boost the voltage. The boosted induced voltage causes the current flowing from the specific-phase armature winding to be supplied to the anode power supply line 37 via the diode connected to the specific-phase armature winding among the diodes 36a to 36c. The battery 40 is regenerated.

  Here, the vehicle power regeneration device 1 of the present example will be described using a more specific example. When an induced electromotive force is generated in the armature winding 21U, the induced voltage caused by the induced electromotive force is used. The flowing current flows to the armature windings 21V and 21W via the switching element 35d and the diodes 36e and 36f, and then flows again to the armature winding 21U as a short-circuit current. It will be stored as energy. Thereafter, the current flowing from the armature winding 21U is regenerated to the battery 40 via the diode 36a and the anode power line 37. In the other armature windings 21V and 21W, as in the case of the armature winding 21U, the current flowing from the armature windings 21V and 21W is the armature winding of the specific phase among the diodes 36a to 36c. It flows to the anode power supply line 37 through the diodes connected to the lines 21V and 21W and is regenerated by the battery 40.

  In order to efficiently regenerate the current in the battery 40, a chopper signal having a predetermined frequency may be simultaneously output to each base of the switching elements 35d, 35e, and 35f while the rotor 23 is rotating. That is, the switching elements 35d, 35e, and 35f are turned on / off in synchronization. By doing so, the power generation operation by the armature windings 21U, 21V, and 21W and the step-up chopper operation are performed at the same time according to the position of the rotor 23. Therefore, the armature windings 21U, 21V, and 21W The regenerative voltage generated can be maintained higher than the output voltage of the battery. In this way, in the vehicle power regeneration device 1, even when the speed of the vehicle 60 is not so high, the regeneration voltage can be boosted so as to be higher than the output voltage of the battery 40. Can be charged. In the present embodiment, the central control circuit unit 31 outputs the rotational speed detection signal output in accordance with the rotational speed of the fan motor 20 even while the fan 10 is rotated by an external force and the fan motor 20 is generating power. Is input from the motor rotation speed detector 50, and the rotation speed of the fan motor 20 is detected (step S4).

  By the way, when electric power regeneration is performed in the above manner, the braking force generally acting between the stator 22 and the rotor 23 becomes strong, so that the rotational speed of the fan motor 20 decreases. Therefore, in this embodiment, even if the rotational speed of the fan motor 20 decreases immediately after the power regeneration circuit 30 starts the power regeneration, the power regeneration circuit 30 does not end immediately. The power regeneration of the power regeneration circuit 30 is terminated at a speed slower than the rotational speed of the fan motor 20 at the start of power regeneration. Specifically, the example shown in FIG. 5 will be used to explain the central control circuit unit 31 via the switching unit 32 when the rotational speed of the fan motor 20 is equal to or higher than the first reference speed (for example, the rotational speed 1000 rpm). When a power regeneration command signal is output to the driver 34, and when the speed becomes lower than a second reference speed (for example, a rotational speed of 200 rpm) lower than the rotational speed at the start of power regeneration of the fan motor 20, The output of the power regeneration command signal to the driver 34 is stopped.

  As described above, the central control circuit unit 31 can finish power regeneration at a speed slower than the rotational speed of the fan motor 20 at the start of power regeneration. Therefore, the central control circuit 31 rotates by operating the fan motor 20 as a generator. Even if the speed decreases, the fan motor 20 can continue to operate as a generator until the speed decreases to a certain rotational speed, and the power regeneration is forcibly terminated immediately after the power regeneration is started. Can be prevented.

  Here, as described above, when power regeneration is performed, the braking force that acts between the stator 22 and the rotor 23 increases, and the rotational speed of the fan motor 20 decreases. When the rotational speed of the fan motor 20 decreases, the electric power regenerated in the battery 40 decreases. Therefore, in this example, even when the rotational speed of the fan motor 20 is decreased, the duty ratio of the chopper signal output to the bases of the switching elements 35d, 35e, and 35f (1 of the chopper signal) in order to sufficiently secure power regeneration. The time ratio at which the signal is at a high level with respect to the period is adjusted. For example, as shown in FIGS. 6 and 7, when the rotational speed of the fan motor 20 is 2200 rpm, the duty ratio is set to 50%, and thereafter, every time the speed decreases by 400 rpm, the duty ratio is increased by 10%, and finally the rotation When the number reaches 200 rpm, the duty ratio is set to 100%. Thus, the relationship between the rotation speed and the duty ratio is stored as table data in the ROM of the central control circuit unit 31 or the like.

  Thus, in the vehicle power regeneration device 1 according to the present embodiment, even when the rotational speed of the fan motor 20 gradually decreases, the duty of the chopper signal output to the bases of the switching elements 35d, 35e, and 35f. The ratio can be varied to gradually increase. As a result, even if the rotational speed is reduced by the regenerative brake, it becomes possible to efficiently flow a larger amount of regenerative current to the battery 40, and thus the power balance in the vehicle 60 can be further improved.

  Then, the central control circuit unit 31 counts and calculates the input rotational speed detection signal to grasp the rotational speed of the fan motor 20, and the fan motor 20 at the time of power regeneration due to a decrease in the traveling speed of the vehicle 60 or the like. It is determined whether or not the rotation speed is lower than a second reference speed (for example, a rotation speed of 200 rpm) (step S5). Here, when the central control circuit unit 31 determines that the rotational speed of the fan motor 20 still exceeds the second reference speed (step S5: NO), the power generated by the fan motor 20 is regenerated. Therefore, the rotation speed is continuously detected without stopping the output of the power regeneration operation signal. On the other hand, when the central control circuit unit 31 determines that the rotational speed of the fan motor 20 is lower than the second reference speed (step S5: YES), the electric power generated by the fan motor 20 is not sufficient for regeneration. Then, the output of the power regeneration command signal to the driver 34 is stopped, and the regeneration of power is terminated (step S6).

  When the temperature of the engine 62 rises due to a decrease in the running speed of the vehicle 60 and the radiator 61 is cooled, the fan motor 20 needs to be driven to rotate as an electric motor. A determination is made as to whether to move to the operation or to continue the power regeneration operation as it is (step S7). Here, when the fan motor 20 is continuously operated as a generator (step S7: YES), the power regeneration operation is continued, while the fan motor 20 needs to be rotationally driven as an electric motor (step S7: NO). ) Ends the power regeneration operation.

As described above, according to the vehicle power regeneration device 1 of the present embodiment, the power regeneration is started when the rotational speed of the fan motor 20 is equal to or higher than a predetermined speed, and the fan at the time of the power regeneration start is started. Since the power regeneration is completed at a speed slower than the rotational speed of the motor 20, even if the rotational speed is lowered by operating the fan motor 20 as a generator, the rotational speed is reduced to a certain rotational speed. The fan motor 20 can continue to operate as a generator until the power regeneration is forcibly terminated immediately after the power regeneration is started. Even when the rotational speed of the fan motor 20 gradually decreases, the regenerative voltage regeneration efficiency is improved by increasing the duty ratio of the chopper signal output to the bases of the switching elements 35d, 35e, and 35f. be able to. Furthermore, as described above, the power regeneration circuit 30 not only regenerates power as described above, but also can perform drive control of the motor. Therefore, it is necessary to separately provide a drive control circuit for driving the motor. No increase in parts cost can be prevented.
In the present embodiment, when the regenerative voltage exceeds the rated voltage of the battery 40, the duty ratio of the chopper signal output to each base of the switching elements 35d, 35e, and 35f may be lowered. In this way, since an average voltage corresponding to the duty ratio is applied to the battery 40, the regenerative voltage can be kept within the rating of the battery 40.

(Second embodiment)
Next, a vehicle power regeneration device according to a second embodiment of the present invention will be described with reference to FIGS. 8 to 12.
FIGS. 8 to 12 are views showing a second embodiment of the present invention, FIG. 8 is a block diagram showing the overall configuration of the vehicle power regeneration device, and FIG. 9 is an explanation showing the electrical configuration of the vehicle power regeneration device. 10 is a first flowchart showing the operation of the vehicle power regeneration device, FIG. 11 is a second flowchart showing the operation of the vehicle power regeneration device, and FIG. 12 is a third flowchart showing the operation of the vehicle power regeneration device. is there.

  The vehicle power regeneration device according to the second embodiment of the present invention is obtained by adding a regenerative current detection unit 150 to the vehicle power regeneration device 1 according to the first embodiment. The vehicle power regeneration device according to the second embodiment is the same as the configuration according to the first embodiment described above except for the configuration in which the regenerative current detection unit 150 is additionally provided, and the description thereof is omitted. And In the description of the second embodiment, the same reference numerals are used for the same members as those according to the first embodiment.

As shown in FIG. 8, the vehicle power regeneration device 101 according to the second embodiment of the present invention is configured to include a regenerative current detection unit 150 in the power regeneration circuit 130. The regenerative current detection unit 150 is for outputting a regenerative current detection signal corresponding to the amount of regenerative current flowing from the fan motor 20, and includes a regenerative current detection resistor 151 and an amplifier 152.
As shown in FIG. 9, the regenerative current detection resistor 151 is connected in series to the cathode power supply line 38 and can detect the amount of regenerative current flowing through the cathode power supply line 38. The amplifier 152 is connected to the cathode side of the regenerative current detection resistor 151, and can output a regenerative current detection signal corresponding to the amount of regenerative current flowing through the regenerative current detection resistor to the central control circuit unit 131. It is like that.

  The central control circuit unit 131 can receive the regenerative current detection signal output from the regenerative current detection unit 150 and can output a motor drive operation signal and a power regeneration operation signal to the switching unit 32. The motor drive command signal and the power regeneration command signal can be output to the driver 34 via the switching unit 32. The central control circuit unit 131 includes an arithmetic processing circuit such as a CPU, similarly to the central control circuit unit 31 according to the first embodiment.

  And the electric power regeneration apparatus 101 for vehicles which concerns on 2nd embodiment which concerns on this invention by the said each structure from the input signal from the various sensors which are arrange | positioned at the vehicle 60, and the motor rotational speed detection part 50. An operation for driving the fan motor 20 (hereinafter referred to as motor driving operation) and an operation for regenerating electric power from the fan motor 20 (hereinafter referred to as power regeneration operation) in accordance with the output rotational speed detection signal. It can be done by switching. In the following description, only operations different from those in the vehicle power regeneration device 1 according to the first embodiment will be described in the motor drive operation and the power regeneration operation in the vehicle power regeneration device 101 according to the second embodiment of the present invention. For other operations similar to those of the vehicle power regeneration device 1 according to the first embodiment, refer to the description of the first embodiment.

  In the vehicle power regeneration device 101 according to the second embodiment of the present invention, the braking force acting between the stator 22 and the rotor 23 is increased by performing power regeneration, as in the first embodiment. A phenomenon occurs in which the rotational speed of the fan motor 20 decreases. Therefore, even when the rotational speed of the fan motor 20 is reduced, the duty ratio of the chopper signal output to the bases of the switching elements 35d, 35e, and 35f is adjusted in order to ensure power regeneration. That is, in this example, the amount of regenerative current is grasped based on the regenerative current detection signal obtained from the regenerative current detector 150, and the amount of regenerative current is changed by increasing and decreasing the duty ratio of the chopper signal. Further, the duty ratio when the regenerative current amount becomes the largest within the changing range is detected, and the chopper signal is output at the duty ratio when the regenerative current amount becomes the largest. Hereinafter, a method for setting the duty ratio performed during power regeneration in the central control circuit unit 131 will be described in detail with reference to the flowcharts shown in FIGS.

  First, the duty ratio is initially set (step S11). The initial setting value of the duty ratio is a duty ratio when the rotational speed of the fan motor 20 exceeds the first reference speed and power regeneration is started. In this example, as in the first embodiment, since power regeneration is started when the rotation speed reaches 1000 rpm, the initial setting value (n = 1) of the duty ratio is set to 80%. The initial set value is stored in advance in a memory (not shown) provided in the central control circuit unit 131. Then, power regeneration is started by outputting a chopper signal having a duty ratio of 80%. Next, the regenerative current detection unit 150 is used to detect the amount of regenerative current during power regeneration (step S12), and the regenerative current value at this time is set as the regenerative current value for the first time (n = 1). It memorize | stores in the memory in the part 131 (step S13).

Then, count-up (n _{n + 1} = n + 1) is performed (step S14), and the duty ratio is reduced (step S15). The duty ratio at this time is, for example, 75%. Although the increase / decrease of the duty ratio can be arbitrarily selected, in this example, it is increased / decreased by 5% as an example. Next, the duty ratio at this time is stored in the memory in the central control circuit unit 131 as the set value for the second time (n = 2) (step S16). By the way, generally, when the duty ratio is reduced as described above, the amount of regenerative current changes. Therefore, the amount of regenerative current is detected using the regenerative current detection unit 150 (step S17), and the regenerative current value at this time is set as the second (n = 2) regenerative current value in the memory in the central control circuit unit 131. (Step S18).

  Then, the central control circuit 131 compares the regenerative current value detected at the first time (n = 1) and the regenerative current value detected at the second time (n = 2) (step S19). That is, the regenerative current value detected and stored last time is compared with the regenerative current value detected and stored this time. When the regenerative current value detected at the second time is larger than the regenerative current value detected at the first time (step S19: YES), the process proceeds to step S31. On the other hand, when the regenerative current value detected at the second time is smaller than the regenerative current value detected at the first time (step S19: NO), the process proceeds to step S20. When the regenerative current value detected at the first time is smaller than the regenerative current value detected at the second time (step S19: NO), the duty ratio is increased by 5% to 85%, for example ( Step S20). Next, the duty ratio at this time is stored again in the memory in the central control circuit unit 131 as the set value for the second time (n = 2) (step S21). When the duty ratio is reduced as described above, the amount of regenerative current changes. Therefore, the regenerative current detection unit 150 is used to detect the amount of regenerative current (step S22), and the regenerative current value at this time is set as the second (n = 2) regenerative current value in the memory in the central control circuit unit 131. (Step S23).

The central control circuit 131 compares the regenerative current value detected at the first time (n = 1) with the regenerative current value redetected at the second time (n = 2) (step S24). ). That is, the regenerative current value detected and stored last time is compared with the regenerative current value detected and stored this time. When the regenerative current value detected at the second time is larger than the regenerative current value detected at the first time (step S24: YES), the process proceeds to step S41. On the other hand, when the regenerative current value detected at the second time is smaller than the regenerative current value detected at the first time (step S24: NO), count-up (n _{n + 1} = n + 1) is performed (step S25), and the process ends. Is determined (step S26). The determination as to whether or not the process ends is, for example, whether or not the rotational speed of the fan motor 20 has fallen below a second reference value (for example, the rotational speed 200 rpm). If it is determined in step S26 that the process is to be terminated (step S26: YES), the entire process is terminated. On the other hand, if it is determined in step S26 that the process is not ended (step S26: NO), the process returns to step S15. And the process of said step S15-step S26 is performed repeatedly.

On the other hand, when the regenerative current value detected at the second time is larger than the regenerative current value detected at the first time in the process of step S19 (step S19: YES), the count-up (n _{n + 1} ) is performed in step S31. = N + 1). Subsequently, the third (n = 3) regenerative current is detected using the regenerative current detector 150 (step S32), and the regenerative current value at this time is the third (n = 3) regenerative current value. Is stored in the memory in the central control circuit 131 (step S33). The central control circuit 131 compares the regenerative current value detected at the second time (n = 2) and the regenerative current value detected at the third time (n = 3) (step S34). That is, the regenerative current value detected and stored last time is compared with the regenerative current value detected and stored this time. If the regenerative current value detected at the third time is larger than the regenerative current value detected at the second time (step S34: YES), the process returns to step S31, and the processes of steps S31 to S34 are repeated. . On the other hand, when the regenerative current value detected at the third time is smaller than the regenerative current value detected at the second time (step S34: NO), the process returns to step S20.

Further, in the process of step S24, when the regenerative current value detected at the second time is larger than the regenerative current value detected at the first time (step S24: YES), the count-up (n _{n + 1} ) is performed in step S41. = N + 1). Subsequently, the third (n = 3) regenerative current is detected by using the regenerative current detecting unit 150 (step S42), and the regenerative current value at this time is the third (n = 3) regenerative current value. Is stored in the memory in the central control circuit 131 (step S43). Then, the central control circuit unit 131 compares the regenerative current value detected at the second time (n = 2) with the regenerative current value detected at the third time (n = 3) (step S44). That is, the regenerative current value detected and stored last time is compared with the regenerative current value detected and stored this time. If the regenerative current value detected at the third time is larger than the regenerative current value detected at the second time (step S44: YES), the process returns to step S41, and the processes of steps S41 to S44 are repeated. . On the other hand, when the regenerative current value detected in the third time is smaller than the regenerative current value detected in the second time (step S44: NO), the process returns to step S25. And according to the said point, each said process is performed continuously until electric power regeneration is complete | finished.

  Thus, in the vehicle power regeneration device 101 according to the present embodiment, the duty ratio of the chopper signal output to the switching elements 35d, 35d, and 35f is measured from 80% to 75%, for example, while measuring the amount of regenerative current. Increase or decrease such as decreasing or increasing from 80% to 85%. Then, when the duty ratio is increased or decreased in this way, the duty ratio that maximizes the regenerative current amount is detected, and the duty ratio that maximizes the regenerative current amount is output to the switching elements 35d, 35e, and 35f. The duty ratio of the chopper signal can be set. As described above, by adjusting the duty ratio optimally according to the amount of regenerative current flowing from the fan motor 20 to the battery 40, it becomes possible to flow more regenerative current to the battery 40 efficiently.

As described above, according to the present embodiment, the following effects are obtained.
(A) According to the vehicle power regeneration devices 1 and 101 of the present embodiment, the power regeneration is started when the rotational speed of the fan motor 20 becomes equal to or higher than a predetermined speed, and at the time of the power regeneration start. Since the power regeneration is completed at a speed slower than the rotational speed of the fan motor 20, even if the rotational speed is reduced by operating the fan motor 20 as a generator, the rotational speed is reduced to a certain rotational speed. The fan motor 20 can continue to operate as a generator until the power regeneration is completed, and a problem that the power regeneration is forcibly terminated immediately after the power regeneration is started can be prevented. Thereby, it is possible to efficiently regenerate the electric power generated by the fan motor 20 by wind energy, and the power balance in the vehicle 60 can be improved.

  (B) Further, in the vehicle power regeneration device 1 according to the first embodiment, the switching elements 35d and 35e according to the decrease in the rotation speed based on the rotation speed detection signal output from the motor rotation speed detection unit 50. , 35f, the duty ratio of the chopper signal output to the switching elements 35d, 35e, 35f can be increased even when the rotational speed of the fan motor 20 is reduced. As a result, a larger amount of regenerative current can be supplied to the battery 40.

  (C) Furthermore, in the vehicle power regeneration device 101 according to the second embodiment, the amount of regenerative current based on the regenerative current detection signal is maximized by varying the duty ratio of the chopper signal output to the switching elements 35d, 35e, and 35f. The duty ratio that maximizes the amount of regenerative current can be set to the duty ratio of the chopper signal that is output to the switching elements 35d, 35e, and 35f. Thereby, even if the rotational speed of the fan motor 20 changes, it is possible to set a duty ratio that maximizes the amount of regenerative current following the changing rotational speed, and to flow more regenerative current to the battery. It becomes possible

  (D) Moreover, in the vehicle power regeneration devices 1 and 101 according to the present embodiment, the fan motor 20 is constituted by a brushless motor, so that motor drive control can be performed with relatively little power during motor drive operation. As a result, the motor drive efficiency can be improved. In addition, since the motor circuit unit 33 is configured by a full-wave drive circuit, it is possible not only to regenerate power but also to control drive of the motor. This eliminates the need for a drive control circuit for driving the motor separately from the power regeneration circuit, thereby preventing an increase in component costs. Furthermore, since the power generation operation and the step-up chopper operation can be performed simultaneously using the full-wave drive circuit unit, the efficiency of the power regeneration operation can be further improved.

  (E) Furthermore, in the vehicle power regeneration device 1, 101 according to this embodiment, the fan is configured by the radiator cooling fan 10 for cooling the radiator 61 disposed in the vehicle 60, and the rotating electrical machine is the radiator. In order to rotationally drive the cooling fan, the fan motor 20 is provided in the vehicle. If comprised in this way, since the existing equipment in the vehicle 60 can be used for the electric power regeneration device for this vehicle, it is possible to suppress the cost increase of the vehicle 60 due to the addition of equipment for power regeneration. It becomes.

The embodiment of the present invention can be modified as follows.
(A) In the present embodiment, the chopper signal is output to all the bases of the switching elements 35d, 35e, and 35f to boost the induced voltages of the armature windings 21U, 21V, and 21W. The induced voltage may be boosted by outputting a chopper signal to the base of one or two of the switching elements 35e and 35f. Similarly to the chopper control of the switching elements 35d, 35e, and 35f, the switching elements 35a, 35b, and 35c are maintained with all the switching signals output to the bases of the switching elements 35d, 35e, and 35f maintained at the LOW level. Even if the induced voltage of any one of the armature windings 21U, 21V, and 21W is boosted by outputting a chopper signal to the base of at least one of the switching elements and performing chopper control. good.

  (B) In the above embodiment, the frequency of the chopper signal output to the bases of the switching elements 35d, 35e, and 35f has been described as being constant, but the present invention is not limited to this. In addition, for example, the regenerative power efficiency may be varied to be optimal according to the rotation speed based on the rotation speed detection signal, the amount of regenerative current based on the regenerative current detection signal, the traveling speed of the vehicle, etc. Of course.

  (C) In the above embodiment, the fan motor 20 is configured to include the three-phase armature windings 21U, 21V, and 21W, but the present invention is not limited to this. In addition, it is possible to modify the two-phase, four-phase, six-phase, etc. by connecting the armature windings in parallel. At this time, the motor circuit unit 33 is configured so that switching elements are connected in series to the armature windings of each phase, and power is regenerated by switching one or more of the switching elements.

  (D) In the above embodiment, the motor circuit unit 33 is configured by a full-wave drive circuit, but the present invention is not limited to this. In addition, like the power regeneration device 201 illustrated in FIG. 13, the motor circuit unit 233 provided in the power regeneration circuit 230 may be configured with a half-wave drive circuit. The motor circuit unit 233 is configured by a half-wave drive circuit for a brushless motor, and includes a driver 234, switching elements 235a and 235b, and diodes 236a and 236b. At this time, the half-wave drive circuit is not limited to two phases but can be configured in two to six phases. Further, by performing chopper control of at least one switching element among the plurality of switching elements 235 a and 235 b, a regenerative current can flow from the armature windings 221 U and 221 V of the fan motor 220 to the battery 40.

  (E) In the above embodiment, the rotational speed of the fan motor 20 is detected using the motor rotational speed detector 50, and the start and end of power regeneration are switched according to the detection result. However, the present invention is not limited to this. In addition, for example, a travel speed detector such as a wheel speed sensor provided in the vehicle 60 may be used, and the start and end of power regeneration may be switched according to the detection result of the travel speed detector.

  (F) In the above embodiment, a brushless motor is used as the fan motor 20, but the present invention is not limited to this. For example, a DC motor with a brush may be used.

  (G) In the above-described embodiment, the fan is configured by the radiator cooling fan 10 for cooling the radiator 61 disposed in the vehicle 60, and the rotating electric machine causes the vehicle 60 to rotate to drive the radiator cooling fan. Although the fan motor 20 is provided, the present invention is not limited to this. In addition, for example, as shown in FIG. 14, the fan is configured by a blower blower fan 72 of a vehicle air conditioner 71 disposed in the vehicle 70, and the rotating electrical machine rotates the blower blower fan. Therefore, it may be configured by a blower motor 73 disposed in the vehicle 70.

  (H) In the above embodiment, when the rotation speed based on the rotation speed detection signal becomes equal to or higher than a predetermined first reference speed, the chopper control for the switching elements 35d, 35e, and 35f is started and the rotation speed is detected. Although the chopper control for the switching elements 35d, 35e, and 35f is stopped when the rotation speed based on the signal becomes equal to or lower than the second reference speed that is slower than the first reference speed, the present invention is limited to this. Is not to be done. In addition, when the amount of regenerative current based on the regenerative current detection signal output from the regenerative current detection unit exceeds a predetermined first reference value, chopper control for the switching elements 35d, 35e, and 35f is started. In addition, the chopper control for the switching elements 35d, 35e, and 35f may be stopped when the amount of regenerative current based on the regenerative current detection signal is equal to or lower than the second reference value that is lower than the first reference value. Even if it comprises in this way, the malfunction that electric power regeneration is forcedly complete | finished immediately after starting electric power regeneration similarly to the above can be prevented.

  The technical ideas other than the claims that can be grasped from the above embodiments will be described below together with the effects thereof. That is, a fan that can be rotated by a traveling wind that the vehicle receives while traveling, a rotating electrical machine that generates electric power as the fan rotates by traveling wind, and a power regeneration circuit that regenerates the power generated by the rotating electrical machine, And a battery for storing electric power regenerated by the power regenerative circuit, wherein the power regenerative circuit can output a regenerative current detection signal corresponding to the amount of regenerative current flowing from the rotating electrical machine. A regenerative current detection unit, a switch unit that short-circuits the armature winding of the rotating electrical machine when the on-state is turned on and induces a voltage on the armature winding when the off-state is turned off, and the switch unit A control unit that performs chopper control, and the control unit is configured to perform the scan when a regenerative current amount based on the regenerative current detection signal is equal to or greater than a predetermined first reference value. The chopper control for the switch unit is started, and the chopper control for the switch unit is stopped when the amount of regenerative current based on the regenerative current detection signal becomes equal to or lower than the second reference value lower than the first reference value. A vehicular power regeneration system comprising: a chopper control function; and a duty ratio variable function that varies a duty ratio of a chopper signal output to the switch unit according to a regenerative current amount based on the regenerative current detection signal. Device.

  According to the above-described vehicle power regeneration device, even if the rotational speed is reduced by the regenerative brake immediately after the power regeneration is started and the amount of regenerative current is reduced, the rotating electrical machine operates as a generator until it decreases to the second reference value. Therefore, it is possible to prevent the occurrence of a problem that the power regeneration is forcibly terminated. As a result, it is possible to efficiently regenerate the electric power generated in the rotating electrical machine by the wind energy, and the power balance in the vehicle can be improved. In addition to the chopper control function, the control unit in the vehicle power regeneration device includes a variable duty ratio that varies the duty ratio of the chopper signal output to the switch unit according to the amount of regenerative current based on the regenerative current detection signal. Features are provided. With this configuration, for example, by adjusting the duty ratio optimally according to the amount of regenerative current flowing from the rotating electrical machine to the battery, more regenerative current can be efficiently flowed to the battery. Can be further improved.

1 is a block diagram showing an overall configuration of a vehicle power regeneration device according to a first embodiment of the present invention. It is explanatory drawing which shows the state which mounted the vehicle electric power regeneration apparatus which concerns on 1st embodiment of this invention in the vehicle. It is explanatory drawing which shows the electric constitution of the electric power regeneration apparatus for vehicles which concerns on 1st embodiment of this invention. It is a flowchart which shows operation | movement of the vehicle electric power regeneration apparatus which concerns on 1st embodiment of this invention. It is explanatory drawing which shows the relationship between the start or completion | finish of electric power regeneration, and a motor rotational speed in the electric power regeneration apparatus for vehicles which concerns on 1st embodiment of this invention. It is explanatory drawing which shows the relationship between the motor rotational speed and duty ratio in the vehicle electric power regeneration apparatus which concerns on 1st embodiment of this invention. It is explanatory drawing which shows the chopper signal in the electric power regeneration apparatus for vehicles which concerns on 1st embodiment of this invention. It is a block diagram which shows the whole structure of the vehicle electric power regeneration apparatus which concerns on 2nd embodiment of this invention. It is explanatory drawing which shows the electrical structure of the electric power regeneration apparatus for vehicles which concerns on 2nd embodiment of this invention. It is a 1st flowchart which shows operation | movement of the vehicle electric power regeneration apparatus which concerns on 2nd embodiment of this invention. It is a 2nd flowchart which shows operation | movement of the vehicle electric power regeneration apparatus which concerns on 2nd embodiment of this invention. It is a 3rd flowchart which shows operation | movement of the vehicle electric power regeneration apparatus which concerns on 2nd embodiment of this invention. It is explanatory drawing which shows the 1st modification of the electric power regeneration apparatus for vehicles which concerns on this embodiment. It is explanatory drawing which shows the 2nd modification of the electric power regeneration apparatus for vehicles which concerns on this embodiment.

Explanation of symbols

1, 101, 201 Power regeneration device for vehicle, 10 fan, 11 rotating shaft, 12 blades, 20, 220 fan motor, 21U, 21V, 21W, 221U, 221V armature winding, 22 stator, 23 rotor, 30, 130 , 230 Power regeneration circuit, 31, 131 Central control circuit part, 31U, 31V, 31W Output terminal, 32 switching part, 33, 233 Motor circuit part, 34, 234 Driver, 35a, 35b, 35c Switching element, 35d, 35e, 35f, 235a, 235b Switching element, 36a, 36b, 36c, 236a, 236b Diode, 36d, 36e, 36f Diode, 37 Anode power line, 38 Cathode power line, 40 Battery, 50U, 50V, 50W Position detector, 50 Motor Rotational speed detection unit, 60 vehicle 61 a radiator, 62 engine, 70 a vehicle, 71 a vehicle air conditioner, 72 blast blower fan, 73 a blower motor, 150 regenerative current detector, 151 regeneration current detection resistor, 152 an amplifier

Claims (8)

A fan that can be rotated by traveling wind received by the vehicle during traveling, a rotating electrical machine that generates electric power as the fan rotates by traveling wind, a power regeneration circuit that regenerates the power generated by the rotating electrical machine, and the power In a vehicle power regeneration device comprising: a battery that stores electrical power regenerated by a regenerative circuit;
The rotating electrical machine includes a rotational speed detection unit capable of outputting a rotational speed detection signal corresponding to the rotational speed of the rotating electrical machine,
The power regeneration circuit short-circuits the armature winding of the rotating electrical machine when turned on and switches the arm to induce a voltage when the armature winding is turned off. A control unit for chopper control,
The control unit starts chopper control for the switch unit when the rotation speed based on the rotation speed detection signal is equal to or higher than a predetermined first reference speed, and the rotation speed based on the rotation speed detection signal. According to the chopper control function for stopping the chopper control for the switch unit when the speed becomes equal to or lower than the second reference speed, which is slower than the first reference speed, and the rotation speed based on the rotation speed detection signal. And a duty ratio varying function for varying the duty ratio of the chopper signal to be output to the vehicle.   The variable duty ratio function includes a function of increasing a duty ratio of a chopper signal output to the switch unit in response to a decrease in a rotation speed based on the rotation speed detection signal. The vehicle power regeneration device according to 1. A fan that can be rotated by traveling wind received by the vehicle during traveling, a rotating electrical machine that generates electric power as the fan rotates by traveling wind, a power regeneration circuit that regenerates the power generated by the rotating electrical machine, and the power In a vehicle power regeneration device comprising: a battery that stores electrical power regenerated by a regenerative circuit;
The rotating electrical machine includes a rotational speed detection unit capable of outputting a rotational speed detection signal corresponding to the rotational speed of the rotating electrical machine,
The power regeneration circuit short-circuits the armature winding of the rotating electrical machine and a regenerative current detecting unit capable of outputting a regeneration current detection signal corresponding to the amount of regenerative current flowing from the rotating electrical machine, A switch part for inducing a voltage in the armature winding when it is turned off, and a control part for chopper-controlling the switch part,
The control unit starts chopper control for the switch unit when the rotation speed based on the rotation speed detection signal is equal to or higher than a predetermined first reference speed, and the rotation speed based on the rotation speed detection signal. According to a chopper control function for stopping chopper control for the switch unit when the speed becomes equal to or lower than a second reference speed that is slower than the first reference speed, and a regenerative current amount based on the regenerative current detection signal. And a duty ratio varying function for varying the duty ratio of the chopper signal output to the unit.   The duty ratio variable function detects the duty ratio that maximizes the amount of regenerative current based on the regenerative current detection signal by varying the duty ratio of the chopper signal output to the switch unit, and the regenerative current amount is the largest. The vehicle power regeneration device according to claim 3, further comprising a function capable of setting a duty ratio of the chopper signal output to the switch unit to a duty ratio of the chopper signal. The rotating electrical machine is composed of a brushless motor,
The switch unit is connected in parallel to an upper arm including a plurality of upper switching elements and a plurality of upper diodes connected in parallel to the upper switching elements, and to a plurality of lower switching elements and the lower switching elements, respectively. A lower arm composed of a plurality of lower diodes and a full-wave drive circuit formed by bridge connection,
5. The vehicular power according to claim 1, wherein the control unit performs chopper control of at least one switching element among the switching elements of the upper arm or the lower arm. Regenerative device. The rotating electrical machine is composed of a brushless motor,
The switch unit is configured by a half-wave drive circuit including a plurality of switching elements and a plurality of diodes connected in parallel to each of the switching elements,
The vehicular power regeneration device according to any one of claims 1 to 4, wherein the control unit performs chopper control of at least one switching element among the plurality of switching elements. The fan comprises a radiator cooling fan for cooling a radiator disposed in the vehicle,
The vehicle according to any one of claims 1 to 6, wherein the rotating electric machine is configured by a fan motor disposed in the vehicle for rotationally driving the radiator cooling fan. Power regeneration device. The fan is constituted by a blower fan for blowing air from a vehicle air conditioner disposed in the vehicle,
7. The vehicle according to claim 1, wherein the rotating electrical machine is configured by a blower motor disposed in the vehicle in order to rotationally drive the blower blower fan. Power regeneration device.

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