JP2005132199A - Control unit for vehicle power seat - Google Patents

Abstract

Control of a vehicle power seat capable of sliding a seat by operating an operation switch even when a relay switch is welded to a contact and the motor drive relay is in an output abnormality detection state. Providing units.
In a control unit 10 for a vehicle power seat according to the present invention, the control means 21 is configured such that one of the relay switches is in an output abnormality detection state in which one of the relay switches continues to be ON regardless of operation of the operation amount adjusting switch 2. When the operation amount adjustment switch is operated in the direction in which the seat is operated when only the switch is turned ON, the current is supplied from the one relay switch to the motor by turning OFF the other relay switch. Activate the seat.
[Selection] Figure 2

Description

  The present invention relates to a control unit for a vehicle power seat capable of electrically operating a seat movable portion in accordance with an operation of an operation switch.

  2. Description of the Related Art Nowadays, a vehicle power seat is known that uses a driving force of a motor or the like to adjust a movable part of a seat, for example, an angle of a seat back, a front and rear position of the seat, and the like (for example, see Patent Document 1). As shown in FIG. 4, the power seat has a control unit 1 for controlling the slide amount of the seat, an operation switch 2 for adjusting the slide amount, and a slide position detection for detecting the slide position (operating position) of the seat. A sensor 3 and a slide drive motor 4 for sliding the seat are provided.

  FIG. 4 shows only sensors and motors (slide position detection sensor 3 and slide drive motor 4) necessary for sliding the seat, but in addition to this, the seat back is reclined. The reclining drive motor used when performing the lift, the lift driving motor used when lifting the seat cushion up and down, the reclining angle detection sensor for detecting the reclining angle, and the shift position detecting sensor for detecting the lift position Etc. are provided.

  The control unit 1 includes a motor drive relay 5 that switches between energization / disconnection of the slide drive motor 4, an output abnormality detection circuit 6 that detects an output state of the motor drive relay 5, and a microcomputer 7. .

  The microcomputer 7 controls the motor drive relay 5 on the basis of an operation signal input in response to the operation of the operation switch 2 or on slide position information stored in a memory (not shown) to drive the slide. The motor 4 is rotated.

  The motor drive relay 5 is provided with two relay switches, a forward relay switch 8 for moving the seat forward and a reverse relay switch 9 for moving the seat backward, and the microcomputer 7 turns on the relay switch. By switching / OFF, the direction of the current applied to the slide drive motor 4 is changed, and the sheet slide direction is switched. More specifically, when the microcomputer does not slide the seat, both the relay switches 8 and 9 are turned OFF as shown in FIG. 5A, and when the seat is advanced, the microcomputer shown in FIG. Thus, when only the forward relay switch 8 is turned ON and a current in the direction of arrow A is supplied to the slide drive motor 4 to move the seat backward, the reverse relay as shown in FIG. Only the switch 9 is turned on to pass a current in the direction of arrow B to the slide drive motor 4.

  The output abnormality detection circuit 6 is a detector that determines whether or not the motor drive relay 5 is abnormal when the relay switch is ON. The output abnormality detection circuit 6 monitors the voltage value of each relay switch 8 and 9 to monitor the relay. The ON / OFF state of the switches 8 and 9 is detected, and this detected state is transmitted to the microcomputer 7. For example, when the relay switch 8 is welded to the contact while the forward relay switch 8 is turned on, the forward relay switch 8 is kept on even after the operation of the operation switch 2 is finished, and the sheet Continue to slide forward. Based on the operation signal of the operation switch 2 and the information from the output abnormality detection circuit, the microcomputer 7 determines that the forward relay switch 8 is in an output abnormal state, and as shown in FIG. The relay switch 9 is turned on. Thus, when the forward relay switch 8 and the reverse relay switch 9 are turned on, the potentials at both ends of the slide drive motor 4 become the same potential, so that the slide drive motor 4 stops. Similarly, when it is determined that the reverse relay switch 9 is in an abnormal output state, the microcomputer 7 turns on the forward relay switch 8 to turn on the slide drive motor 4 as shown in FIG. Stop.

In this way, when either the forward relay switch 8 or the reverse relay switch 9 continues to be turned on by welding or the like at the contact point, the microcomputer 7 turns on the other relay switch to turn on the sheet. The operation is stopped and the drive control of the slide drive motor 4 is stopped to enter the fail save state.
Japanese Utility Model Publication No. 4-96541

  However, if the output abnormality detection state described above is entered, the drive control of the slide drive motor 4 is stopped due to the fail save state, and therefore the seat cannot be moved at all even if the operation switch 2 is operated. There was an inconvenience.

  The present invention has been made in view of the above problems, and even when the relay switch is welded to a contact and the motor drive relay is in an output abnormality detection state, by operating the operation switch, It is an object of the present invention to provide a control unit for a vehicle power seat that allows the slide drive motor to be driven and allows the seat to slide.

  In order to solve the above problems, the invention according to claim 1 is directed to a motor that electrically operates a movable portion of a seat, an operation amount adjustment switch for adjusting the operation amount of the seat, and an operation of the operation amount adjustment switch. And a first relay switch for supplying current from one direction to the motor to drive the motor in the forward rotation direction, and to the motor to drive the motor in the reverse rotation direction. A second relay switch for supplying a current from another direction, a switch state detecting means for detecting an ON / OFF state of the first relay switch and the second relay switch, and the operation amount adjusting switch according to an operation of the operation amount adjusting switch. ON / OFF control of the first relay switch and the second relay switch, and based on the information detected by the switch state detection means 1 relay switch and control means for judging the output state of the second relay switch, and based on the information detected by the switch state detection means, either the first relay switch or the second relay switch When the relay switch detects an output abnormality detection state that remains ON regardless of the operation amount adjustment switch operation, the control means turns on the other relay switch to stop the operation of the motor. A control unit for a power seat for a vehicle, wherein the control means operates the operation amount adjustment switch in a direction in which the seat is operated when only the one relay switch is turned on in the output abnormality detection state. If the other relay switch is turned off, the mode is Wherein by supplying a current from one of the relay switch, characterized in that to operate the sheet against.

  According to the first aspect of the present invention, the seat can be operated by operating the operation amount adjustment switch even when the output abnormality detection state is reached.

  Hereinafter, a control unit according to the present invention will be described with reference to the drawings. Note that components having the same functions as those of the control unit described in [Background Art] will be described using the same reference numerals.

  FIG. 1 shows a vehicle power seat 11 on which a control unit 10 is installed. The vehicle power seat 11 includes a seat back (back portion) 12 and a seat cushion (seat surface portion) 13. The seat back 12 is attached to the rear end portion of the seat cushion 13 via a link mechanism 14 so as to be reclining. The seat cushion 12 is slidable back and forth (movable forward and backward) via a slider 17 with respect to a base rail 16 fixed to the vehicle body floor 15.

  The seat cushion 13 incorporates a slide drive motor 4 for moving the seat cushion 13 forward and backward and a slide position detection sensor 3 for detecting the slide position, and the seat back 12 similarly. A reclining drive motor 18 for raising and lowering a reclining position and a reclining position detection sensor 19 for detecting a reclining position (reclining angle) are incorporated.

  Further, the seat cushion 13 includes a control unit 10 and an operation switch 2. The control unit 10 receives the operation signal of the operation switch 2 and controls the slide drive motor 4 and the reclining drive motor 18 to realize the reclining operation of the seat back 12 and the advance / retreat operation of the seat cushion 13.

  FIG. 2 is a block diagram showing the operation switch 2, the control unit 10, the slide drive motor 4, and the slide position detection sensor 3. The control unit 10 includes a microcomputer 21, a motor drive relay 5, and an output abnormality detection circuit 6. The microcomputer 21 controls ON / OFF control of the forward / backward relay switch 8 and the reverse relay switch 9 of the motor drive relay 5 according to the operation signal received from the operation switch 2 to control the drive direction of the slide drive motor 4. Controls the seat slide position.

  In FIG. 2, one set of drive unit 30 necessary for moving the seat forward / backward, specifically, slide drive motor 4, slide position detection sensor 3, output abnormality detection circuit 6, and motor drive relay 5 is provided. Although only shown, these drive units 30 are set in the seat with the same configuration as drive units for reclining the seat back, and drive units for performing the front lift of the seat cushion It can also be installed as a drive unit for performing a rear lift.

  The operation switch 2 is installed on the side of the seat cushion 3, and includes a slide switch 2a for adjusting the slide position of the seat cushion 13 and a recliner switch 2b for adjusting the reclining angle of the seat back 12. A front lifter switch 2c for adjusting the lift of the front portion of the seat cushion 13 and a rear lifter switch 2d for adjusting the lift of the rear portion of the seat cushion 13 are installed as necessary. .

  The microcomputer 21 controls the motor drive relay 5 based on the operation signal input in response to the operation of the slide switch 2a or based on the slide position information of the sheet stored in the memory (storage unit). The drive motor 4 is driven. The memory can store the optimum sheet position for each user. When the ignition is turned on, the microcomputer 21 drives each driving motor according to the sheet position information stored in the memory. Thus, it is possible to automatically adjust the sheet position.

  The motor drive relay 5 includes a forward relay switch 8 and a reverse relay switch 9, and the microcomputer 21 switches the ON / OFF of the relay switches 8, 9 to energize the slide drive motor 4. Change the slide direction of the sheet. Since the specific operation of the relay switches 8 and 9 has already been described in [Background Art], description thereof is omitted here.

  The output abnormality detection circuit 6 is a detector that determines whether or not the motor drive relay 5 is abnormal when the forward relay switch 8 or the reverse relay switch 9 is ON. Is turned on, the transistor of the output abnormality detection circuit 6 is turned on, and information indicating that the relay switches 8 and 9 are turned on is transmitted to the microcomputer 21.

  Although the microcomputer 21 does not control the relay switches 8 and 9 to be turned on based on the received signal received from the operation switch 2 or the sheet position information stored in the memory, the output abnormality detection circuit 6 When the information indicating that the forward relay switch 8 or the reverse relay switch 9 is turned on is detected, it is determined that the motor drive relay 5 is in an output abnormality detection state. When the microcomputer 21 determines that the motor drive relay 5 is in the output abnormality detection state, for example, when the forward relay switch 8 or the reverse relay switch 9 is welded to the contact of the relay switch, the microcomputer 21 moves forward. The relay switch 8 and the reverse relay switch 9 are operated so as to be turned on to stop the driving of the slide drive motor and enter the fail save state. Specific control of the forward relay switch 8 or the reverse relay switch 9 of the microcomputer 21 in the output abnormality detection state will be described later.

  The slide position detection sensor 3 outputs a pulse signal to the microcomputer 21 according to the rotation of the slide drive motor 4, that is, according to the front / rear position of the seat. The microcomputer 21 determines the slide position of the sheet based on the received pulse signal.

  Next, the motor drive relay 5 control process of the microcomputer 21 accompanying the operation of the slide switch 2a will be described using the flowcharts shown in FIGS.

  First, the microcomputer 21 determines whether or not the forward operation of the seat cushion 13 has been performed by the slide switch 2a based on whether or not the forward operation signal has been received by the operation switch 2 (step S10). When the microcomputer 21 determines that the forward operation is performed by the slide switch 2a, the forward relay switch 8 of the motor drive relay 5 is turned ON (step S30), and the direction in which the seat advances the slide drive motor 4 is set. To drive.

  If it is determined that the forward operation is not performed by the slide switch 2a, the microcomputer 21 turns off the forward relay switch 8 (step S20) and then determines whether or not the backward operation signal is received from the operation switch 2. Then, it is determined whether or not the seat cushion 13 has been retracted by the slide switch 2a (step S40).

  If the microcomputer 21 determines that the reverse operation has been performed by the slide switch 2a, the reverse relay switch 9 of the motor drive relay 5 is turned ON (step S60), and the seat moves backward in the slide drive motor 4. Drive in the direction.

  If the microcomputer 21 determines that the reverse operation has not been performed by the slide switch 2a, the microcomputer 21 turns off the reverse relay switch 9 (step S50), and then the seat cushion 13 is based on the seat position stored in the memory. Then, it is determined whether slide processing is being executed by another control processing reach or the like (step S70).

  When the slide treatment based on the seat position or the like stored in the memory is not being executed, the microcomputer 21 determines whether or not the forward relay switch 8 and the forward switch 8 based on the signal input from the output abnormality detection circuit 6 (whether the transistor is ON). The ON / OFF state of the reverse relay switch 9 is determined, and it is determined whether or not an output abnormality has occurred in the motor drive relay 5 (step S80).

  When it is determined by the signal from the output abnormality detection circuit 6 that the forward relay switch 8 or the reverse relay switch 9 is ON, the forward relay switch 8 and the reverse relay are processed in the processing of step S20 and step S50. Regardless of whether or not the control for turning off the switch 9 has been performed and the slide treatment based on the seat position stored in the memory is not executed, at least the forward relay switch 8 or the reverse switch Since one of the relay switches 9 is NO, the microcomputer 21 determines that the forward relay switch 8 or the reverse relay switch 9 is welded or the like and is in the ON state. In this case, the microcomputer 21 controls the forward relay switch 8 and the reverse relay switch 9 to turn on the relay switch, and turns on the forward relay switch 8 and the reverse relay switch 9 to perform the slide drive. By making the voltage applied to the motor 4 equal, the drive of the slide drive motor 4 is stopped (fail save state, step S90). In this way, by turning ON the forward relay switch 8 and the reverse relay switch 9 of the motor drive relay 5, it is possible to prevent current from always flowing into the slide drive motor 4 due to the ON state of the welded relay switch. In addition, unintentional movement of the sheet can be avoided.

  The process up to this point (steps S10 to S90 shown in FIG. 3A) ends the motor drive relay output abnormality detection process.

  After entering the fail-save state in step 90 (after the process of step S90), after turning on the forward relay switch 8 or the reverse relay switch 9 in step S30 or step S60 (after the process of step S30 or step S60), After the slide treatment based on the seat position or the like stored in the memory is executed (when YES is determined in step S70), or the forward relay switch 8 or the reverse relay switch 9 is activated by a signal from the output abnormality detection circuit 6. If it is determined that the sheet is OFF (NO in step S80), the microcomputer 21 determines again whether or not the seat has been advanced by the slide switch 2a (step S100).

  If it is determined that the forward operation is not performed by the slide switch 2a, the microcomputer 21 shifts the processing to the determination (step S160) whether or not the backward operation of the sheet is performed by the slide switch 2a.

  If the microcomputer 21 determines that the forward operation has been performed by the slide switch 2a, whether or not the motor drive relay 5 is in the fail save state by the process of step S90 (the forward relay switch 8 and the reverse relay). It is determined whether or not both switches 9 are ON (step S110).

  If it is determined that the fail save state is set, the microcomputer 21 cancels the fail save state (step S120). Here, the release of the fail save state is a process in which the microcomputer 21 controls the motor drive relay 5 so as to turn off the forward relay switch 8 and the reverse relay switch 9 to allow drive control of the slide drive motor. Means.

  After the fail-safe state is released (after execution of step S120 or NO in step S110), the microcomputer 21 controls the motor drive relay 5 so that the forward relay switch 8 is turned on, and the slide drive motor 4 is driven (step S130). By this processing, when the reverse relay switch 9 is welded, the forward relay switch 8 and the reverse relay switch 9 are turned ON, and the slide drive motor 4 is not driven. Although the seat is not operated, it is possible to avoid a situation in which the seat moves backward. When the forward relay switch 8 is welded, the backward relay switch 8 is turned off by releasing the fail save state. Therefore, the sheet continues to advance, and the sheet can be moved according to the operation of the operation switch.

  Thereafter, the microcomputer 21 determines whether or not the forward operation of the seat cushion 13 by the slide switch 2a has been completed (whether the forward operation by the slide switch 2a has been turned off) (step S140). When the forward operation is finished, the microcomputer 21 controls the motor drive relay 5 so that the forward relay switch 8 is turned OFF, and performs the output abnormality detection by the output abnormality detection circuit 6 (step S150).

  After executing the process of step S150, or when it is determined in step S140 that the forward operation has not ended, the microcomputer 21 determines whether or not the seat backward operation has been performed by the slide switch 2a (step S160). ). When the microcomputer 21 determines that the backward operation is not performed by the slide switch 2a, the process of the flowchart shown in FIG. 3-B is ended, and the process of the flowchart shown in FIG. Repeat the process of ~.

  If it is determined that the slide switch 2a is operated to move backward, the microcomputer 21 determines whether or not the motor drive relay 5 is in the fail save state by the process of step S90 (step S170). If it is determined that the fail save state is set, the microcomputer 21 performs a process of canceling the fail save state (step S180), and after the fail safe state is released (after execution of step S180 or NO in step S170). ), The microcomputer 21 controls the motor drive relay 5 so that the reverse relay switch 9 is turned on, and drives the slide drive motor 4 (step S190). By this process, when the forward relay switch 8 is welded, the forward relay switch 8 and the reverse relay switch 9 are turned ON, and the slide drive motor 4 is not driven. The situation in which the seat moves forward despite not being operated can be avoided. When the reverse relay switch 9 is welded, the forward relay switch 8 is turned OFF by releasing the fail save state. Therefore, the sheet moves backward, and the sheet can be moved according to the operation of the slide switch 2a.

  Thereafter, the microcomputer 21 determines whether or not the operation of retracting the sheet by the slide switch 2a is completed (whether the operation of retreating by the slide switch is turned off) (step S200). When the reverse operation is completed, the microcomputer 21 controls the motor drive relay 5 so that the reverse relay switch 9 is turned OFF, and performs an output abnormality detection by the output abnormality detection circuit 6 (step S210). After the process of the flowchart shown in FIG. 3 is finished, the same process (the process of step S10 shown in FIG. 3A) is repeated again. Even when the backward operation is not finished, the microcomputer 21 finishes the process as it is, and repeats the same process (the process of step S10) again.

  Thus, by using the control unit 21 according to the present invention, the forward relay switch 8 or the reverse relay switch 9 is welded or the like, and even when the output abnormality detection state (fail save state) is entered, When the forward relay switch 8 is welded and ON, the seat can be advanced by operating the slide switch 2a, and when the reverse relay switch 9 is welded and ON. The seat can be moved backward by operating the slide switch 2a. Further, when the forward relay switch 8 is welded and turned ON, it is possible to prevent the seat from moving forward when the slide switch 2a is not operated. Similarly, the reverse relay When the switch 9 is welded and turned on, it is possible to prevent the seat from moving backward without operating the slide switch 2a.

  The control unit according to the present invention has been described above using the slide control unit used for sliding the seat back and forth. However, the present invention is a control unit used when the seat slides. Even in the case of a control unit that performs seat reclining control, it is possible to achieve the same effect by performing the same control as the slide control unit. Further, a similar control may be performed in a lift control unit that controls the lift operation of the front part or the rear part of the seat cushion.

It is a schematic block diagram of the power seat for vehicles provided with the control unit which concerns on this invention. It is the block diagram which showed the operation switch, control unit, slide drive motor, and slide position detection sensor which concern on this invention. It is the flowchart which showed the abnormal output detection process by a microcomputer. It is the flowchart which showed the slide drive process in the fail save state by a microcomputer. It is the block diagram which showed the operation switch, the control unit, the slide drive motor, and the slide position detection sensor which were used conventionally. It is the schematic which showed the structure of the motor drive relay and the slide drive motor.

Explanation of symbols

1, 10 Control unit 2 Operation switch (Operating amount adjustment switch)
3 Slide position detector 4 Slide drive motor (motor)
5 Motor drive relay 6 Output abnormality detection circuit (switch state detection means)
7, 21 Microcomputer (control means)
8 Forward relay switch (first relay switch)
9 Reverse relay switch (second relay switch)

Claims (1)

A motor that electrically operates the movable portion of the seat, an operation amount adjustment switch for adjusting the operation amount of the seat, and the motor for driving the motor in the forward rotation direction in accordance with an operation of the operation amount adjustment switch. A first relay switch for supplying current from one direction to the motor; a second relay switch for supplying current from another direction to the motor to drive the motor in a reverse rotation direction; ON / OFF control of the first relay switch and the second relay switch according to the operation of the switch amount detecting means for detecting ON / OFF states of the first relay switch and the second relay switch and the operation amount adjusting switch And the output of the first relay switch and the second relay switch based on the information detected by the switch state detecting means. And control means for determining a state,
Based on the information detected by the switch state detection means, an output abnormality detection state in which one of the first relay switch and the second relay switch remains ON regardless of the operation amount adjustment switch operation. A control unit for a vehicle power seat that stops the operation of the motor by turning on the other relay switch when the control means detects
In the output abnormality detection state, the control means sets the other relay switch when the operation amount adjustment switch is operated in a direction in which the seat is operated when only one of the relay switches is turned on. The vehicle power seat control unit according to claim 1, wherein when the power is turned off, a current is supplied to the motor from the one relay switch to operate the seat.

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