JP2009090721A - Vehicular air-conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prolong cooling operation time and to enhance comfortableness by preventing overcooling by a vehicular air-conditioner which can perform the cooling operation even under an operation stop state of the refrigeration cycle by storing cold in a heater. <P>SOLUTION: The vehicular air-conditioner can perform the cooling operation when the operation of a refrigeration cycle 30 is stopped, by storing cold in a heater 4 during the cooling operation and discharging the cold storage energy from a cooler 3 and the heater 4. The air-conditioner is provided with a first detour door 71, a second detour door 72, a first intermediate door 73, and a second intermediate door 74, which can switch the supply air route in a supply air passage 13 to a series mode for passing the cooler 3 and the heater 4 in series, to a cooler single mode for passing only through the cooler 3 from the cooler 3 to a heater detour circuit 15, and to a heater single mode for passing only through the heater 4 from a cooler detour circuit 14. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a vehicle air conditioner, and more particularly to a vehicle air conditioner that performs a cooling operation using cold storage energy in a compressor stopped state.

  In recent years, the fuel efficiency of vehicles has progressed, and so-called idling stop that stops the engine during idling may be performed.

  Since the compressor driven by the engine is also stopped at the time of idling stop, there is a need for a vehicle air conditioner that can perform a cooling operation as much as possible even when the refrigeration cycle is stopped.

  As a vehicle air conditioner that enables a cooling operation when such a refrigeration cycle is stopped, for example, one described in Patent Document 1 is known.

  The vehicle air conditioner described in Patent Document 1 stops the supply of the heating refrigerant to the heater when cooling is driven by the compressor, stores the refrigerant in the refrigerant of the heater, and stores the cold in the heater when the compressor is stopped. Cooling operation can be continued using cold storage energy.

That is, when the compressor is stopped, air is blown in series with the cooler and the heater, and the cooling operation can be continued using the residual cool energy of the cooler and the cool energy of the heater.
JP 2004-142596 A

  However, in the above-described conventional technology, all the airflow of the air conditioning unit passes through the cooler, and when the compressor is stopped, the airflow always passes through the cooler and the heater in series. Initially, although a large amount of cold storage energy was obtained, as the heat exchange progressed, the cold storage energy of the cooler and the heater was lost at the same time, and the time for cooling operation was not sufficient.

  In addition, as described above, the cool storage energy of the cooler and the cool storage energy of the heater are allowed to cool in series. Therefore, there is a risk of overcooling and discomfort to the occupant at the initial stage of cooling by the cool storage energy. It was.

  The present invention has been made paying attention to the above-described conventional problems, and extends the cooling operation possible time in a vehicle air conditioner that cools the heater and allows the cooling operation even when the compressor is stopped. It is possible to improve the comfort by preventing overcooling.

  In order to achieve the above-mentioned object, the invention according to claim 1 is characterized in that a blower passage is formed by a blower from a suction port communicated with a passenger compartment to a blower outlet communicated with the passenger compartment. And a heat exchanger that cools the blast by heat exchange with a refrigerant forming a refrigeration cycle, and heat exchange with engine cooling water that is disposed downstream of the chiller and circulated from the engine in the air passage. A heater that heats the air by a heater, a heater bypass circuit that is formed in the air passage and that passes through the cooler, bypasses the heater and guides the air to the air mix section downstream of the heater, A cooling valve that shuts off the engine coolant from the engine and traps the engine coolant in the heater, and stores the cold in the heater during cooling, and when the operation of the refrigeration cycle is stopped, A vehicle air conditioner capable of cooling by discharging cool storage energy between the cooler and the heater, wherein the cooling is formed in the air passage and guides the air to the heater by bypassing the cooler A bypass mode, a serial mode for passing the air flow path in series with the cooler and the heater, a cooler single mode for passing the heater bypass path from the cooler, and the cooler bypass route The vehicle air conditioner is characterized by including a blower switching door that can be switched to a heater single mode that allows the heater to pass through the road.

  Further, the invention according to claim 2 is the vehicle air conditioner according to claim 1, wherein the air blowing switching door causes the air to pass through the heater bypass route from the cooler. A vehicle air conditioner capable of forming a parallel mode in which the air mix unit downstream of the heater passes through a path to pass through and a path through which the heater passes from the bypass circuit of the cooler. It was.

  The invention according to claim 3 is the vehicle air conditioner according to claim 2, wherein the blower switching door is a first bypass door capable of forming an open state and a shut-off state of the cooler bypass route. A second bypass door capable of forming an open state and a shut-off state of the heater bypass route, a bypass route blocking position where the cooler bypass route is shut off, and a space between the cooler and the heater. A first intermediate door that is movably attached to the existing intermediate blocking position, a bypass blocking position that blocks the heater bypass, and extends between the cooler and the heater, A second intermediate door that is movably attached to an intermediate cutoff position that is arranged continuously with the first intermediate door at the intermediate cutoff position so as to block between the cooler and the heater; It was set as the vehicle air conditioner characterized by these.

  According to a fourth aspect of the present invention, in the vehicle air conditioner according to any one of the first to third aspects, a control device that controls mode switching of the air blowing switching door and opening / closing of the shutoff valve. The control device performs a normal cooling process for performing cooling in the operating state of the refrigeration cycle and a regenerative cooling process for performing cooling in the stopped state of the refrigeration cycle, and further, during the normal cooling process While the preset condition is established, the storage valve is configured to store the cooling air in the heater in the series mode with the blower switching door in the state where the shut-off valve is shut off and the engine cooling water is confined in the heater. In the cool storage cooling process, the cooler single cooling process for cooling the cooler by using the cool energy stored in the cooler in the cooler single mode, A heater alone cooling process to cool the cold accumulating energy of the heater the conversion door as a heater alone mode, and the vehicle air-conditioning system, characterized in selectively performing a.

  Moreover, the invention of claim 5 is the vehicle air conditioner of claim 4, wherein the blower switching door is capable of forming the parallel mode of claim 2 or claim 3. And the control device detects a signal from a blower outlet temperature sensor that detects a blower outlet temperature that is a blower outlet temperature and a cooler blowout temperature that is a blower temperature immediately after passing through the cooler. A signal from the blowing temperature sensor and a signal indicating the operating state of the refrigeration cycle are input, and in the cold storage cooling process, first, the cooler blowing temperature is lower than the first set value while the cooler When the cooler outlet temperature exceeds the first set value, the air blowing door is set in a parallel mode until the outlet temperature exceeds the second set value. Before cooling and cooling A vehicle that performs a parallel cooling process in which the cooling of the heater is performed in parallel, and then, when the outlet temperature exceeds a second set value, executes the heater single cooling process. The air conditioner was used.

  In the vehicle air conditioner of the present invention, during the cooling operation, the cooler and the heater are stored cold, and the cooling operation can be continued even when the refrigeration cycle is stopped by using the stored cold energy. In this case, the cooler can store cold using the refrigerant supplied during the operation of the refrigeration cycle. On the other hand, in the heater, the engine cooling water is confined in the heater by the shut-off valve, and in this state, the air switching door is set in the serial mode, and the cold air that has passed through the cooler can be sent to the heater and stored in the heater .

  And in the stop state of a refrigerating cycle, at the time of air_conditioning | cooling by cooling of the cool storage energy with a cooler and a heater, in this invention, a cooler and a heater are connected in series like before by switching the mode of a ventilation switching door. In addition to the path to pass, a path through which the air flows only through the cooler can be formed as the cooler single mode, and a path through which the air flows only through the heater can be formed as the heater single mode.

  Therefore, by using the air passage of the cooler single mode or the heater single mode, it is possible to suppress the discharge amount of the cold storage energy per unit time as compared with the case where the air is cooled by the air passage of only the serial mode. In addition to extending the cooling time using the cold energy, overcooling can be prevented and comfort can be improved.

  In addition, in both the single modes, the air blowing resistance can be reduced as compared with the series mode, and efficient cooling is possible.

  Furthermore, in the invention according to claim 2, the air blowing switching door causes the air blowing to branch into a path that passes only the cooler and a path that passes only the heater, and then merges in the air mix unit. The mode can be formed.

  Therefore, by adding the cooling in the parallel mode between the cooling in the cooler single mode and the cooling in the single heater mode, the cold storage energy of one of the cooler and the heater alone keeps the cold air temperature low. When the amount becomes unacceptable, it is possible to cool the stored energy while keeping the cooling air temperature low, improve the cooling efficiency, and extend the cooling time using the stored energy. Can do.

  In the invention according to claim 3, the four doors of the first bypass door, the second bypass door, the first intermediate door, and the second intermediate door are used as the switching door, and the series mode described above is used. In addition, it is possible to switch between four modes of air blowing, that is, a cooler single mode, a heater single mode, and a parallel mode.

  That is, in the serial mode, at least one of the first bypass door and the first intermediate door is shut off, the cooler bypass is shut off, the second bypass door is shut off, the heater bypass is shut off, 1 intermediate door and 2nd intermediate door are arrange | positioned in positions other than an intermediate | middle interruption | blocking position, and it opens between a cooler and a heater. Thereby, ventilation passes in series with a cooler and a heater.

  In the cooler single mode, the first bypass door is shut off, the cooler bypass is shut off, the second bypass door is opened, the heater bypass is opened, and the first intermediate door and the second intermediate door are opened. It arrange | positions in an intermediate | middle interruption | blocking position, and is set as the state which interrupted | blocked between a cooler and a heater. Thereby, ventilation passes through a heater detour without passing a heater from a cooler.

  In the heater single mode, the first bypass door is opened, the cooler bypass is opened, the second bypass door is shut off, the heater bypass is shut off, and the first intermediate door and the second intermediate door are opened. It arrange | positions in an intermediate | middle interruption | blocking position, and interrupts | blocks between a cooler and a heater.

  In this case, the blast passes through the heater via the cooler bypass without passing through the cooler.

  In the parallel mode, the first bypass door is opened, the cooler bypass is opened, the second bypass door is opened, the heater bypass is opened, and the first intermediate door and the second intermediate door are As an intermediate cutoff position, the cooler and the heater are shut off.

  In this case, the air flow is branched independently into two paths: a path passing through the cooler and passing through the heater bypass, and a path passing from the cooler bypass and passing through the heater.

  In the invention according to the third aspect, the door for blocking between the cooler and the heater is composed of two doors of the first intermediate door and the second intermediate door, which is compared with the case where one door is used. Thus, the space required for the movement of the door can be reduced, and the apparatus can be reduced in size.

  In addition, since the flow rate between the cooler and the heater can be adjusted by the first intermediate door and the second intermediate door, it can function as an air mix door during normal cooling. The number of doors can be reduced as compared with the case where the doors are provided, and the structure can be simplified to reduce the cost, reduce the weight, and reduce the size.

  In the invention according to claim 4, the control device performs a cold storage process of storing cold using engine cooling water confined in the heater when the preset condition is satisfied during the cooling operation, and then the idling is performed. When the operation of the refrigeration cycle is stopped due to a stop or the like, the control device executes a cold storage cooling process in which cooling is continued using the cold storage energy of the cooler and the heater.

  In this cool storage cooling process, the control device sets the ventilation switching door to the cooler single mode, cooler single cooling processing for cooling the cooler storage energy, and sets the ventilation switching door to the heater single mode to cool storage energy of the heater. And a single cooling process for the heater that cools the battery.

  Therefore, the cooling time can be extended and the comfort can be improved by preventing overcooling, compared to the case where the air flow path simply passes through the cooler and the heater in series.

  In the invention according to claim 5, when executing the regenerative cooling process, first, the cooler single cooling process is executed until the cooler outlet temperature exceeds the first set value, and the cooler energy stored in the cooler single mode is executed. Allow to cool.

  Therefore, until the cool storage energy of the cooler is allowed to cool to some extent, the cool storage energy of the heater is maintained, and overcooling is prevented and comfortable cooling is performed.

  Thereafter, when the cooler energy stored in the cooler is released to some extent and the cooler outlet temperature exceeds the first set value, the control device executes the parallel cooling process until the outlet temperature exceeds the second set value. The cool storage energy of the cooler and the cool storage energy of the heater are allowed to cool.

  In this case, the cold storage energy of the cooler is lowered by the cooler single cooling process, and the temperature of the cold air cannot be kept low by itself, but in the state where the cooler can still be cooled, While the temperature of the cooling air is kept low by allowing the cooler to cool, the cool storage energy can be released while the cooler can cool, improving the cooling efficiency and extending the cooling time using the cool storage energy.

  Thereafter, when the blow-out temperature exceeds the second set value, the control device executes a heater single cooling process, and cools the regenerator energy of the heater in the heater single mode.

  In this case, since the blast does not pass through the cooler that has released the cool storage energy, the cooler that has released the cool storage energy when the air cooled by the heater and blown into the vehicle interior is sucked again. In this case, the temperature of the blowout port can be lowered as compared with the case where the blower is passed through the cooler. Therefore, the cooling time can be extended.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  The vehicle air conditioner according to this embodiment has an air passage (13) in which air is directed from an inlet (11) communicated with a vehicle compartment to an air outlet (12) communicated with the vehicle compartment by a blower (2). ) And a cooler (3) that is arranged in the air passage (13) and cools the air by heat exchange with a refrigerant forming the refrigeration cycle (30), and in the air passage (13), the cooler ( 3) is arranged in the downstream of the blast and is formed in the heater (4) for heating the blast by heat exchange with the engine cooling water circulated from the engine (EG), and the blast passage (13). 3) A heater bypass circuit (15) that guides the air that has passed through the heater (4) to the air mix section (16) downstream of the air heater (4), and the engine (EG) The engine cooling water from (4) a shut-off valve (6) for confining engine cooling water in the cooler (4), storing the cold in the heater (4) during cooling, and when the operation of the refrigeration cycle (30) is stopped, the cooler (3) A vehicle air conditioner that discharges cold storage energy with a heater (4) and is capable of cooling, and is formed in the air passage (13), and the air is bypassed through the cooler (3) A cooler bypass circuit (14) leading to the heater (4), a serial mode for passing the air flow path in series with the cooler (3) and the heater (4), and the cooler (3 ) Can be switched between a cooler single mode for passing the heater bypass circuit (15) and a heater single mode for passing the heater (4) from the cooler bypass circuit (14). Switching doors (71, 72, 73, 74) It is a vehicle air-conditioning system according to claim.

  Below, based on FIGS. 1-7, the vehicle air conditioner A of Example 1 of the best embodiment of this invention is demonstrated.

  FIG. 1 is an overall schematic diagram showing an outline of the configuration of a vehicle air conditioner A. The vehicle air conditioner A includes an air conditioning unit AU installed in an instrument panel (not shown).

  The air conditioning unit AU includes a unit case 1 in which a ventilation passage 13 is formed which extends from an intake port 11 capable of selectively taking inside and outside air to an air outlet 12 to which various ducts (not shown) connected to the vehicle interior are connected. I have.

  A blower fan 2, a cooler 3, and a heater 4 are installed in the air passage 13 of the unit case 1 in order from the air upstream side.

  The blower fan 2 forms air blow W from the inlet 11 toward the outlet 12 in the unit case 1. The blower fan 2 is driven by a drive control signal from the fan controller 20.

  The cooler 3 is one of the components of the refrigeration cycle 30 that circulates a known refrigerant. The well-known refrigeration cycle 30 includes a compressor 31 that is driven by a traveling engine EG and compresses the refrigerant, a condenser 32 that cools the high-pressure gaseous refrigerant to a saturated liquid, and a low-temperature and low-pressure refrigerant. An expansion valve 33 that serves as a vapor and a liquid tank 34 that performs gas-liquid separation of the refrigerant are provided.

  Moreover, the cooler 3 is installed substantially orthogonally with respect to the ventilation direction so that heat exchange is possible when the ventilation of the ventilation path 13 passes like illustration.

  And in the ventilation path 13, the cooler detour circuit 14 which detours the cooler 3 to the upper direction is formed.

  The heater 4 heats the air blown by known engine cooling water. When the air blown through the air passage 13 passes through at a position in the air blower downstream direction of the cooler 3, heat can be exchanged in the air blowing direction. In contrast, it is installed substantially orthogonally.

  A heater bypass circuit 15 that bypasses the heater 4 downward is formed in the air passage 13, and the air that has passed through the heater 4 (usually downstream of the heater 4 in the air blowing direction) The air mix unit 16 is formed to mix the warm air) and the cool air that has passed through the heater bypass 15.

  In the first embodiment, the shutoff valve 6 is provided that shuts off the engine coolant supplied to the heater 4 and allows the engine coolant to be confined in the heater 4. The shutoff valve 6 is opened and closed by driving a valve actuator 60.

  Further, the air conditioning unit AU has four sheets of a first bypass door 71, a second bypass door 72, a first intermediate door 73, and a fourth intermediate door 74 as a ventilation switching door for switching the flow of the air flow in the air passage 13. The door is provided.

  The first bypass door 71 is rotatably supported by the unit case 1 at the end position on the upstream side in the air blowing direction of the cooler bypass 14, and along the upper surface of the unit case 1 as shown in FIG. 2. Between the position where the cooler bypass 14 is opened and the position where the tip is brought into contact with the cooler 3 and the cooler bypass 14 is shut off as shown in FIG. It is supported so as to be rotatable in the vertical direction within the range.

  The second bypass door 72 is rotatably installed in the unit case 1 at the upstream end position of the heater bypass 15 in the air blowing direction, and is disposed along the lower surface of the unit case 1 as shown in FIG. The position where the heater bypass 15 is opened, and the tip is in contact with the vicinity of the rotation center of the second intermediate door 74 at the lower end of the heater 4 as shown in FIG. It is supported so as to be rotatable in the vertical direction within the range of the position to be in the state.

  The first intermediate door 73 and the second intermediate door 74 allow the passage between the cooler 3 and the heater 4 to be shut off, and allow the amount of air that has passed through the cooler 3 to go to the heater 4 to be adjusted. The first intermediate door 73 is rotatably attached to the upper end portion of the cooler 3 on the downstream side in the air blowing direction, and the second intermediate door 74 is attached to the lower end portion on the upstream surface in the air blowing direction of the heater 4. It is pivotally attached.

  As shown in FIG. 3, the first intermediate door 73 has a tip abutted against the upper surface of the unit case 1 and shuts off the cooler bypass 14 at its downstream end, as shown in FIG. In addition, the top end of the second intermediate door 74 contacts the front end of the second intermediate door 74 obliquely downward, and the second intermediate door 74 is rotated in the vertical direction within a range between the cooler 3 and the heater 4. Supported as possible.

  As shown in FIG. 3, the second intermediate door 74 abuts the front end of the first intermediate door 73 with the front end inclined obliquely upward, and blocks between the cooler 3 and the heater 4 together with the first intermediate door 73. As shown in FIG. 2, it is supported so as to be rotatable in the vertical direction between the position and a position where the tip is brought into contact with the lower surface of the unit case 1 to block the heater bypass 15.

  By the first bypass door 71, the second bypass door 72, the first intermediate door 73, and the second intermediate door 74 described above, the air blow W in the unit case 1 is connected in series mode, parallel mode, cooler single mode, and heating. Four air blowing paths can be formed.

  That is, the serial mode is a mode for guiding the air blow W through the cooler 3 and the heater 4 in series as shown in FIG. In this case, the first bypass door 71 is arranged at a position where the cooler bypass 14 is opened (this may be a blocking position), and the first intermediate door 73 is set at a position where the cooler bypass 14 is blocked. The second intermediate door 74 is disposed at a position where the heater bypass 15 is blocked, and the second bypass door 72 is disposed at a position where the heater bypass 15 is opened.

  Therefore, in this series mode, the air blow W flows through the cooler 3 and the heater 4 in series as indicated by an arrow CW.

  As shown in FIG. 5, the parallel mode is a mode in which the air blow W is branched independently into one that passes through the cooler 3 and one that passes through the heater 4. In this case, the first bypass door 71 is disposed at a position where the cooler bypass 14 is opened, and the first intermediate door 73 and the second intermediate door 74 are disconnected from the cooler 3 and the heater 4. The second detour door 72 is disposed at a position where the heater detour 15 is opened.

  Therefore, in this parallel mode, the blower W is branched into a blower that passes through the cooler 3 and a blower that bypasses the cooler 3, and the blown air that passes through the cooler 3 is heated through the heater bypass circuit 15. Detour around the vessel 4 toward the air mix unit 16. On the other hand, the air that has bypassed the cooler 3 passes through the cooler bypass circuit 14, passes through the heater 4, and then travels to the air mix unit 16.

  The cooler single mode is a mode in which only the cooler 3 passes the blower W as shown in FIG. In this case, the first bypass door 71 is disposed at a position where the cooler bypass 14 is blocked, and the first intermediate door 73 and the second intermediate door 74 are blocked between the cooler 3 and the heater 4. The second detour door 72 is disposed at a position where the heater detour 15 is opened.

  Accordingly, in this cooler single mode, the entire amount of the blown air W passes through the cooler 3, passes through the heater bypass 15, and travels to the outlet 12 via the air mix unit 16.

  The heater single mode is a mode in which only the heater 4 passes the blower W as shown in FIG. In this case, the first bypass door 71 is disposed at a position where the cooler bypass 14 is opened, and the first intermediate door 73 and the second intermediate door 74 are disconnected from the cooler 3 and the heater 4. The second detour door 72 is disposed at a position where the heater detour 15 is blocked.

  Therefore, in this heater single mode, the entire amount of the blown air W bypasses the cooler 3 and travels through the cooler bypass circuit 14, then passes through the heater 4, passes through the air mix unit 16, and goes to the outlet 12. .

  The first intermediate door 73 and the second intermediate door 74 have a function of a well-known air mix door. That is, after the first bypass door 71 blocks the cooler bypass 14 and the second bypass door 72 opens the heater bypass 15, the first intermediate door 73 and the second intermediate door 74 are opened. By adjusting the distance between the tips of the two, that is, the opening degree, the amount of the blast cooled by passing through the cooler 3 can be adjusted to the heater 4, and the warm air heated by the heater 4; The ratio at which the cool air traveling around the heater 4 is mixed in the air mix unit 16, that is, the outlet temperature can be adjusted.

  The first bypass door 71, the second bypass door 72, the first intermediate door 73, and the second intermediate door 74 described above are opened and closed by the door driving device 70 that drives the rotation shafts of the respective doors 71 to 74. Done.

  The operations of the door drive device 70, the fan controller 20, and the valve actuator 60 are controlled by the air conditioning control unit 100.

  The air-conditioning control unit 100 executes well-known air-conditioning control for controlling the temperature of the blown air and the amount of blown air based on a set temperature, an outside air temperature, a vehicle interior temperature, an amount of solar radiation, and the like, which will be described later.

  That is, the air conditioning control unit 100 is input from the outside air sensor 101, the inside air sensor 102, the solar radiation sensor 103, the setting device 104, the cooler outlet temperature sensor 105, the heater outlet temperature sensor 106, the outlet temperature sensor 107, and the engine control unit 200. The operation of the door driving device 70, the fan controller 20, and the valve actuator 60 is controlled based on the received signal.

  The outside air sensor 101 is installed outside the vehicle and detects the outside air temperature.

  The inside air sensor 102 is installed in the passenger compartment and detects the room temperature.

  The solar radiation sensor 103 is installed in the passenger compartment and detects the amount of solar radiation and the direction of solar radiation.

  The setting device 104 is installed in the passenger compartment and outputs signals such as room temperature, blowing mode, and air volume set by the operation of the occupant.

  The heater blowing temperature sensor 106 is installed immediately after the heater 4, that is, downstream in the blowing direction, and detects a heater blowing temperature Tho that is a blowing temperature immediately after passing through the heater 4.

  The cooler outlet temperature sensor 105 is installed immediately after the cooler 3, that is, downstream in the blowing direction, and detects a cooler outlet temperature Tev that is a blowing temperature immediately after passing through the cooler 3.

  The blower outlet temperature sensor 107 is installed in the blower outlet 12, and detects the blower outlet temperature Tout which is the ventilation temperature of the blower outlet 12. FIG.

  The engine control unit 200 controls the driving of the engine EG, and a signal for stopping the engine EG by a known idling stop control is input to the air conditioning control unit 100. The idling stop control is a control in which the engine EG is automatically stopped when the vehicle is idling stopped, and the engine EG is automatically restarted by a start operation such as depression of an accelerator pedal.

  On the basis of these inputs, the air conditioning control unit 100 executes cooling control, which is a feature of the present invention, in addition to executing known air conditioning control.

  As this cooling control, the air conditioning control unit 100 executes a normal cooling process and a cold storage cooling process.

  The normal cooling process is a cooling process that has been performed conventionally, and the cooling operation is performed by determining the blowing temperature based on the setting of the setting device 104. In the normal cooling process, the engine EG is driven. It is assumed that the refrigeration cycle 30 is operating. In this normal cooling process, each of the doors 71 to 74 is set to the cooler single mode shown in FIG. 3, and the air that has passed through the cooler 3 bypasses the heater 4 to the outlet 12. Led. At this time, when the above air mix is necessary, the opening of the first intermediate door 73 and the second intermediate door 74 is adjusted to control the outlet temperature according to the set temperature.

  The cold storage cooling process is a characteristic feature of the first embodiment, in which the engine control unit 200 performs idling stop control to stop the engine EG and perform a cooling operation in a non-operating state of the refrigeration cycle 30. It is.

  Hereinafter, the flow of processing in this cold storage cooling processing will be described based on the flowchart of FIG. In addition, the process of step S1-S3 of this flowchart is a process performed during normal control before starting execution of a cool storage cooling process.

  In step S1, it is determined whether or not the room temperature is stable. When the room temperature is stable, the process proceeds to the next step S2, and when the room temperature is stable, the determination in step S1 is repeated. Note that the room temperature is stable refers to a state in which the difference between the room temperature detected by the inside air sensor 102 and the set temperature of the setting device 104 is close to the set temperature, which is a so-called full cool state in which rapid cooling is performed. It is determined that it has passed.

  In step S2, the cold storage process to the heater 4 is performed. This cold storage process is a process of storing cold storage energy in the heater 4 by the cold air cooled by the cooler 3, and outputs the doors 71 to 74 to the serial mode shown in FIG. I do.

  In the first embodiment, at the start of the cooling operation, the air conditioning control unit 100 closes the shutoff valve 6 to the valve actuator 60 and shuts off the supply of engine cooling water to the heater 4 to cool the engine. It is assumed that a process of confining water in a path including the heater 4 is performed. In addition, you may perform the process which makes this shut-off valve 6 a closed state at the time of the start of the cool storage process of step S2.

  Further, as the heater 4, it is preferable to use an engine cooling water storage section provided with the heater 4 itself or between the shutoff valve 6 and the heater 4.

  In the next step S3, it is determined whether or not the idling stop control is being executed based on the input from the engine control unit 200. When the idling stop control is being executed, the process proceeds to step S4, and when not being executed, the process returns to step S1.

  In step S4, a cooler single cooling process is executed. This cooler independent cooling process is a process of cooling the blower W using the cold energy stored in the cooler 3 by the refrigerant sent to the cooler 3 immediately before the compressor 31 is stopped. In addition, a signal for switching the doors 71 to 74 to the cooler single mode shown in FIG. 3 is output.

  In the next step S5, it is determined whether or not the cooler outlet temperature Tev is equal to or higher than a preset cooling reference temperature Tr based on the detection value of the cooler outlet temperature sensor 105, and the cooler outlet temperature Tev is determined as the cooling reference. If the temperature is lower than the temperature Tr, the cooler single cooling process in step S4 is continued. When the cooler blowing temperature Tev becomes equal to or higher than the cooling reference temperature Tr, the process proceeds to the next step S6 and the parallel cooling process is executed.

  In addition, when returning to the cooler single cooling process of step S4, it is determined whether the idling stop process of step S11 is continuing, and when not continuing, it returns to step S1.

  Further, the cooling reference temperature Tr is a temperature effective for cooling the passenger compartment, and is, for example, a temperature within a range of about 10 to 15 ° C., and is 12 ° C. in the first embodiment.

  The parallel cooling process in step S6 is a process in which the cooler 3 and the heater 4 perform cooling in parallel, and a signal for switching the doors 71 to 74 to the parallel mode shown in FIG. Output.

  In the next step S7, it is determined whether or not the outlet temperature Tout of the outlet 12 of the air conditioning unit AU is equal to or higher than the cooling reference temperature Tr. If the outlet temperature Tout is lower than the cooling reference temperature Tr, the process proceeds to step S6. If the parallel cooling process is continued and the outlet temperature Tout is equal to or higher than the cooling reference temperature Tr, the process proceeds to the next step S8.

  In addition, when returning to the parallel cooling process of step S6, it is determined whether the idling stop process of step S12 is continuing, and when not continuing, it returns to step S1.

  In step S8, a heater single cooling process is executed. This heater single cooling process is a mode in which the cooling of the air blow is performed using the cold energy stored only in the heater 4, and the doors 71 to 74 are switched to the heater single mode shown in FIG. .

  In subsequent step S9, based on the detection value of the heater outlet temperature sensor 106, it is determined whether the heater outlet temperature Tho is equal to or higher than the cooling reference temperature Tr. If the heater outlet temperature Tho is lower than the cooling reference temperature Tr, step S8 is performed. When the heater blow-off temperature Tho is equal to or higher than the cooling reference temperature Tr, the process proceeds to step S10, the engine start process is executed, and an engine start command is output to the engine control unit 200. To do.

  In addition, when returning to the heater single cooling process of step S8, it is determined whether the idling stop process of step S13 is continuing, and when not continuing, it returns to step S1.

  Next, the operation of the first embodiment will be described.

(When cooling)
During the cooling operation, the shutoff valve 6 is closed, the engine cooling water is confined in the heater 4, and the high-temperature engine cooling water is not supplied to the heater 4.

  Here, when the room temperature becomes close to the set temperature and the room temperature is stabilized, the air conditioning control unit 100 executes the cold storage process based on the process from step S1 to step S2.

  Accordingly, the doors 71 to 74 are set to the serial mode shown in FIG. 2, and the cool air CW cooled by the cooler 3 is guided to the heater 4, and the engine coolant confined in the heater 4 is cooled. Thus, the heater 4 is stored cold.

(When idle ring is stopped)
When the engine control unit 200 stops the engine EG along with the stop of the adling, the air conditioning control unit 100 executes a cold storage cooling process using the cold storage energy of the cooler 3 and the heater 4.

  Immediately after the start of this cool storage cooling process, since the evaporative refrigerant is supplied to the cooler 3 and the cool storage energy is large, the air conditioning control unit 100 first selects the cooler alone based on the process from step S3 to step S4. The cooling process is executed.

  In this case, the doors 71 to 74 are switched to the cooler single mode shown in FIG. 3, and all of the blown air W in the blower passage 13 passes through the cooler 3 and is cooled by the cool energy stored in the cooler 3. CW3 is guided to the outlet 12. In this case, the cooler outlet temperature Tev is kept below the cooling reference temperature Tr, and the room temperature can be sufficiently cooled, and overcooling can be avoided.

  By performing this cooler independent cooling process, the temperature of the cooler 3 rises when the cool storage energy of the cooler 3 is released with time.

  Therefore, when the cooler outlet temperature Tev detected by the cooler outlet temperature sensor 105 exceeds the preset cooling reference temperature Tr, the air conditioning control unit 100 performs the parallel cooling process based on the process from step S5 to S6. Execute.

  By this parallel cooling treatment, the doors 71 to 74 are switched to the parallel mode shown in FIG. 5, and the air flow in the air passage 13 first proceeds to the cooler 3, and bypasses the cooler 3 to cool the cooler 3. It branches to what goes to the heater 4 through the detour 14.

  Then, the cold air CW 51 cooled by the cooler 3 and the cold air CW 52 cooled by the cold energy stored in the heater 4 are mixed by the air mix unit 16 and blown out from the air outlet 12.

  At this time, the cooler 3 has already cooled, and the cooler outlet temperature Tev exceeds the cooling reference temperature Tr, but cooling of the air blow W to some extent is possible, while the heater 4 is It has sufficient cold storage energy, and the cooling performance by the heater 4 is sufficiently high.

  Therefore, it is possible to effectively release the cold storage energy of the cooler 3 while keeping the air temperature from the outlet 12 low.

  With the elapse of the cooling time due to the parallel cooling process, the cold storage energy of the cooler 3 that has been left alone for the first time decreases.

  Therefore, when the air outlet temperature Tout from the air outlet 12 exceeds the cooling reference temperature Tr, the air conditioning control unit 100 executes the heater single cooling process based on the process from step S7 to step S8.

  Each door 71-74 is switched to the heater single mode shown in FIG. 4 by this heater independent cooling process, and the ventilation of the ventilation path 13 bypasses the cooler 3, and is cooled by the heater 4. CW4 is led to the air outlet 12.

  In this case, since the air is cooled only by the heater 4 in which the cold storage energy remains without passing through the cooler 3 that has released the cold storage energy, the blower outlet is compared with the one that blows in series with the cooler 3. The temperature Tout can be lowered to reliably cool.

  As the cooling time by the heater single cooling process elapses, the cool storage energy of the heater 4 is released and the cooling performance is lowered. When the heater blowing temperature Th exceeds the cooling reference temperature Tr, the air conditioning control unit 100 Based on the process from step S9 to step S10, the cool storage cooling process is terminated, a signal for starting the engine EG is output to the engine control unit 200, the compressor 31 is driven, and the normal cooling process is resumed.

  That is, when the heater blow-out temperature Th exceeds the cooling reference temperature Tr, it means that the cool storage energy of the heater 4 has been released, and thus cooling by discharging more cool storage energy deteriorates the indoor environment. The compressor 31 is driven to operate the refrigeration cycle, and the normal cooling by the cooler 3 is restored.

  In the middle of the cool storage cooling process, the driver returns to the normal cooling process in a separate routine even when the start operation is performed and the idling stop by the engine control unit 200 is canceled and the engine EG is started. Based on the NO determination in any of steps S11, S12, and S13, the process returns to the cold storage determination in step S1.

  According to the cold storage cooling process described above, the cooler 3 and the heater 4 are always allowed to cool in series in order to selectively cool the cool energy of the cooler 3 and the cool energy of the heater 4. As compared with the above, the outlet temperature Tout can be maintained at a temperature lower than the cooling reference temperature Tr for a long time.

  FIG. 7 shows the cooling energy of the cooler and the heater as described in Patent Document 1 when cooling (T01) in which only the cooler energy is not allowed to cool by the conventional heater. It is a figure which shows the comparative example of the blower outlet temperature Tout with time passage by the time of cooling (T02) letting it cool in series, and the cooling at the time of idling stop of this Example 1 (T03).

  As shown in this figure, the time from the start of cooling until each outlet temperature T01, T02, T03 exceeds the cooling reference temperature Tr is the longest in the first embodiment, compared to the case of series cooling. It can be seen that the time can be extended by tz.

  As described above, in the vehicle air conditioner A according to the first embodiment, the cooling energy stored in the cooler 3 and the heater 4 is used for cooling while the refrigeration cycle 30 is stopped during cooling. Compared with the case where the cooler 3 and the heater 4 are always allowed to cool in series because the cooler 3 and the heater 4 can be selectively cooled when performing the regenerative cooling process. Thus, the outlet temperature Tout from the air conditioning unit AU can be kept low for a long time.

  Therefore, it is possible to extend the time during which the cooling operation can be performed by the regenerative cooling process, and to achieve a balance between fuel efficiency and comfort at a higher level.

  Further, in the first embodiment, at the time of executing the cold storage cooling process, first, the cooler 3 is allowed to cool alone, and then, when the heat storage energy of the cooler 3 is reduced to some extent, the cool storage energy of the cooler 3 is completely reduced. Until it is allowed to cool, parallel cooling of the cooler 3 and the heater 4 is performed to prevent the outlet temperature Tout from becoming high, and then the cooler 3 may reversely heat the airflow. When this occurred, the heater 4 was allowed to stand alone, and the heater 4 was allowed to stand alone until the heater blowing temperature Tho exceeded a preset cooling reference temperature Tr.

  Therefore, compared with taking out the cool storage energy of the cooler 3 and the cool storage energy of the heater 4 in order, it can cool as long as possible, keeping the blower outlet temperature Tout low.

  In addition, in the first embodiment, the first bypass door 71 and the first intermediate door 73 are provided so that the cooler bypass 14 can be cut off at the upstream end and the downstream end of the cooler bypass 14 respectively. The first intermediate door 73 is disposed so as to be able to block between the cooler 3 and the heater 4 together with the second intermediate door 74 disposed at the lower end of the heater 4, and the heater bypass circuit 15 can be blocked. A second bypass door 72 is provided.

  Thereby, compared with what uses one door as a door which interrupts | blocks between the cooler 3 and the heater 4, the space required for rotation of a door is made small, and the cooler 3 and the heater 4 Can be kept small.

  Therefore, it is possible to form four air blowing paths of the series mode, the parallel mode, the heater single mode, and the cooler single mode while keeping the external dimensions of the air conditioning unit AU small.

  In addition, the first intermediate door 73 and the second intermediate door 74 function as an air mix door that adjusts the amount of cold air that has passed through the cooler 3 to pass through the heater 4. It is possible to reduce the number of doors compared to the one in which the door is installed, and the structure can be simplified to reduce the cost, reduce the weight, and reduce the size.

  As mentioned above, although Embodiment and Example 1 of this invention were explained in full detail with reference to drawings, the concrete structure is not restricted to this Embodiment and Example 1, and does not deviate from the summary of this invention. A degree of design change is included in the present invention.

  For example, in the first embodiment, as the doors 71 to 74, doors that rotate around the axis and change the flow path cross-sectional area are used. However, as these doors, the flow path cross-sectional area can be changed. If so, other doors such as a sliding door may be used.

  In the first embodiment, the compressor 31 of the refrigeration cycle 30 is directly driven by the engine EG. However, the compressor 31 is not limited to this, and is electrically driven, for example, combined use of power generation by the engine and battery power. You may use things.

  In the first embodiment, the cool storage cooling process is executed at the time of idling stop control. However, the present invention is not limited to this, and may be executed when the operation of the refrigeration cycle 30 is stopped by another control. Good.

  Moreover, in Example 1, although the completion | finish judgment of the cooler independent cooling process of step S5 showed what was performed with the cooler blowing temperature Tev, it is not limited to this, For example, it performs with the blower outlet temperature Tout. Also good. That is, the cooling performance of the cooler 3 may determine whether or not the outlet temperature Tout can be kept below the set temperature, and when the outlet temperature Tout exceeds the set temperature, the cooling performance may be shifted to the parallel cooling process. .

  Moreover, although the completion | finish judgment of the parallel cooling process of step S7 was shown with the blower outlet temperature Tout, you may make it with the cooler blowout temperature Tev. That is, when the cooler outlet temperature Tev exceeds the set temperature, it is determined that the cold energy has been released, the parallel cooling process is terminated, and the process proceeds to the next heater single cooling process. Good.

  Furthermore, in Example 1, the completion | finish judgment of the cooler independent cooling of step S5, the completion | finish judgment of the parallel cooling process of step S7, and the completion | finish judgment of the heater independent cooling of step S9 are respectively common cooling reference temperature. Although an example in which the determination is made based on whether or not it is greater than or equal to Tr has been described, these determination values may be set to different temperatures individually.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration explanatory diagram illustrating a configuration of a vehicle air conditioner A according to Example 1 of the best mode of the present invention. It is mode explanatory drawing explaining the state which set each door 71-74 of the vehicle air conditioner A of Example 1 to the serial mode. It is mode explanatory drawing explaining the state which set each door 71-74 of the vehicle air conditioner A of Example 1 to the cooler single mode. It is mode explanatory drawing explaining the state which set each door 71-74 of the vehicle air conditioner A of Example 1 to the heater single mode. It is mode explanatory drawing explaining the state which set each door 71-74 of the vehicle air conditioner A of Example 1 to the parallel mode. It is a flowchart which shows the flow of the process in the cool storage cooling process of the air-conditioning control unit of the vehicle air conditioner A of Example 1. FIG. It is a blowing temperature characteristic figure which shows the blower outlet temperature change accompanying the time passage at the time of the cool storage air_conditioning | cooling process of the vehicle air conditioner A of Example 1, and a prior art.

Explanation of symbols

2 Blower fan (blower)
DESCRIPTION OF SYMBOLS 3 Cooler 4 Heater 6 Shut-off valve 11 Inlet 12 Outlet 13 Blower passage 14 Cooler bypass 15 Heater bypass 16 Air mix part 30 Refrigeration cycle 31 Compressor 71 1st bypass door (blower switching door)
72 Second bypass door (blower switching door)
73 1st intermediate door (blower switching door)
74 Second intermediate door (blower switching door)
100 Air conditioning control unit (control device)
105 Cooler outlet temperature sensor 106 Heater outlet temperature sensor 107 Outlet temperature sensor A Vehicle air conditioner EG Engine

Claims (5)

An air passage that forms air flow from the suction port communicated with the passenger compartment to the air outlet communicated with the passenger compartment, by a blower;
A cooler that is arranged in the air passage and cools the air by heat exchange with a refrigerant forming a refrigeration cycle;
In the air passage, a heater that is disposed downstream of the cooler and heats the air by heat exchange with engine coolant circulated from the engine, and
A heater bypass circuit that is formed in the air passage and that passes through the cooler, bypasses the heater, and leads to an air mix section downstream of the heater.
A shutoff valve that shuts off the engine coolant from the engine and traps the engine coolant in the heater;
An air conditioner for a vehicle that cools by storing heat in the heater at the time of cooling and releasing cool storage energy of the cooler and the heater when the operation of the refrigeration cycle is stopped,
A cooler bypass circuit that is formed in the ventilation passage and that guides the airflow to the heater by bypassing the cooler;
A serial mode for passing the air flow path in series with the cooler and the heater, a cooler single mode for passing the heater bypass from the cooler, and the heater from the cooler bypass A blower switching door that can be switched to a heater single mode that passes through
A vehicle air conditioner characterized by comprising:   The air blowing switching door passes the air from the cooler through the heater detour and the cooler, and the path from the cooler detour through the heater. The vehicle air conditioner according to claim 1, wherein a parallel mode for joining at an air mix section downstream of the heater can be formed. The air blowing switching door is
A first bypass door capable of forming an open state and a shut-off state of the cooler bypass route;
A second bypass door capable of forming an open state and a shut-off state of the heater bypass route;
A first intermediate door movably attached to a detour blocking position that blocks the cooler detour and an intermediate blocking position that extends between the cooler and the heater;
The detour path blocking position for blocking the heater detour path, and extending between the cooler and the heater and continuously disposed with the first intermediate door at the intermediate block position, so that the cooling An intermediate blocking position for blocking between the heater and the heater; and a second intermediate door movably attached to the intermediate blocking position;
The vehicle air conditioner according to claim 2, comprising: A control device for controlling mode switching of the air blowing switching door and opening and closing of the shutoff valve;
The control device performs a normal cooling process for performing cooling in an operating state of the refrigeration cycle, and a regenerative cooling process for performing cooling in an operation stopped state of the refrigeration cycle,
Further, during the normal cooling process, while a preset condition is satisfied, the blower switching door is set to the series mode in the state where the shutoff valve is shut off and the engine cooling water is trapped in the heater. Execute cold storage process to store cold in the heater,
And in the said cool storage air_conditioning | cooling process, the cooler single cooling process which cools by the cool storage energy of the cooler by making the said ventilation switch door into a cooler single mode, and the cooler independent energy by the cooler energy of a heater by making a ventilation switch door into a heater single mode The vehicle air conditioner according to any one of claims 1 to 3, wherein a heater single cooling process for cooling is selectively performed. The vehicle air conditioner according to claim 4,
As the air blowing switching door, one capable of forming the parallel mode according to claim 2 or claim 3 is used,
The control device includes a signal from a blower outlet temperature sensor that detects a blower outlet temperature that is a blower temperature of the blower outlet, and a cooler blowout temperature that detects a cooler blowout temperature that is a blower temperature immediately after passing through the cooler. A signal from the sensor and a signal indicating the operating state of the refrigeration cycle are input,
And in the said cool storage air_conditioning | cooling process, first, while the said cooler blowing temperature is less than a 1st setting value, the said cooler independent cooling process is performed, and after that, the said cooler blowing temperature exceeds the said 1st setting value And until the said blower outlet temperature exceeds 2nd setting value, the said ventilation switching door is made into parallel mode, and the parallel cooling process which performs the cooling of the said cooler and the cooling of the said heater in parallel is performed. The vehicle air conditioner is executed, and when the outlet temperature exceeds a second set value, the heater single cooling process is executed.

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