WO2021020163A1

WO2021020163A1 - Vehicle air conditioner

Info

Publication number: WO2021020163A1
Application number: PCT/JP2020/027794
Authority: WO
Inventors: 徹也石関
Original assignee: サンデン・オートモーティブクライメイトシステム株式会社
Priority date: 2019-07-29
Filing date: 2020-07-17
Publication date: 2021-02-04
Also published as: JP2021020572A

Abstract

The purpose of the present invention is to provide a vehicle air conditioner capable of relatively easily and accurately specifying a failed control valve. An air conditioning controller (32) according to the present invention sequentially executes respective operation modes, on the basis of information related to the temperature and/or pressure of a refrigerant circuit (R), upon determining that an abnormality has occurred due to a failure of any one of control valves (an outdoor expansion valve (6), an indoor expansion valve (8), an auxiliary expansion valve (73), a heater valve (21), and a dehumidification valve (22)), and executes a failure part defining mode for defining a failed control valve from the temperature and/or pressure of the refrigerant circuit (R) obtained through the executed operation mode .

Description

Vehicle air conditioner

The present invention relates to a heat pump type air conditioner for air-conditioning the interior of a vehicle.

Due to the emergence of environmental problems in recent years, hybrid vehicles and electric vehicles have become widespread. As an air conditioner that can be applied to such a vehicle, a compressor that compresses and discharges the refrigerant, a radiator that is provided on the vehicle interior side to dissipate the refrigerant, and a radiator that is provided on the vehicle interior side are provided. A heat absorber that absorbs the refrigerant, an outdoor heat exchanger that is installed outside the vehicle interior to dissipate or absorb the refrigerant, an outdoor expansion valve that reduces the pressure of the refrigerant flowing into the outdoor heat exchanger, and a plurality of switches for switching the flow of the refrigerant. A heating mode equipped with electromagnetic valves and controlling these electromagnetic valves to dissipate the refrigerant discharged from the compressor in the radiator and absorb the refrigerant dissipated in this radiator in the outdoor heat exchanger, and from the compressor. A dehumidification mode in which the discharged refrigerant is dissipated in the radiator and the refrigerant dissipated in the radiator is absorbed only by the heat absorber, or the heat absorber and the outdoor heat exchanger absorb heat, and the refrigerant discharged from the compressor is exchanged for outdoor heat. A device has been developed that switches between a cooling mode in which heat is dissipated in a container and heat is absorbed in a heat absorber (see, for example, Patent Document 1).

On the other hand, if the battery (vehicle-mounted device) is charged and discharged in an environment where the temperature is high due to self-heating, etc., deterioration will progress, and there is a risk that it will eventually malfunction and be damaged. Therefore, a refrigerant-heat medium heat exchanger (heat exchanger for vehicle-mounted equipment) is provided to exchange heat between the refrigerant circulating in the refrigerant circuit and the heat medium, and the refrigerant-heat medium heat exchanger absorbs heat from the refrigerant. A device has also been developed in which the battery can be cooled by circulating the cooled heat medium (cooling water) through the battery (see, for example, Patent Documents 2 and 3).

JP-A-2017-154521 Japanese Patent No. 5668700 Japanese Patent No. 5440426

If a control valve such as an outdoor expansion valve or a solenoid valve as described above fails, normal operation cannot be achieved, but conventionally, the operator identifies the failed control valve from the temperature and pressure of the refrigerant circuit. Or, since the failure of the control valve is identified by a complicated determination method by the control device, an erroneous determination occurs or the control is complicated. Therefore, there is a problem that the time and cost for maintenance increase.

The present invention has been made to solve the conventional technical problem, and provides an air conditioner for a vehicle capable of identifying a failed control valve relatively easily and accurately. With the goal.

The vehicle air conditioner of the present invention includes a compressor that compresses the refrigerant, a radiator that dissipates the refrigerant and heats the air supplied to the vehicle interior, and a heat absorber that absorbs the refrigerant and cools the air supplied to the vehicle interior. , An outdoor heat exchanger provided outside the vehicle interior to absorb or dissipate the refrigerant, a refrigerant circuit having a plurality of control valves for controlling the flow of the refrigerant, and a control device, and the control valve is provided by this control device. By controlling, a plurality of operation modes are switched and executed, and the control device has an abnormality caused by a failure of one of the control valves based on information on the temperature and / or pressure of the refrigerant circuit. When it is determined that has occurred, each operation mode is executed in sequence, and a failure location determination mode for determining the failed control valve is executed from the temperature and / or pressure of the refrigerant circuit obtained in the executed operation mode. It is characterized by that.

The vehicle air conditioner according to the second aspect of the present invention is characterized in that, in the above invention, the control device does not execute the failure location determination mode when the failed control valve is specified.

The vehicle air conditioner according to claim 3 is characterized in that, in each of the above inventions, the control device executes a failure location determination mode on condition that a predetermined input operation is performed.

The vehicle air conditioner according to the fourth aspect of the present invention has a high pressure sensor capable of detecting the high pressure side pressure of the refrigerant circuit and a low pressure pressure capable of detecting the low pressure side pressure of the refrigerant circuit in all the operation modes in each of the above inventions. It is characterized by having a sensor.

In the vehicle air conditioner according to the invention of claim 5, in the above invention, the control device has a failure location on the condition that the detection value of the high pressure pressure sensor and the detection value of the low pressure pressure sensor are within the range in which the compressor can be operated. It is characterized by starting each operation mode in the confirmation mode.

The vehicle air conditioner according to claim 6 is characterized in that, in each of the above inventions, the temperature sensor capable of detecting the temperature of the refrigerant circuit from the refrigerant outlet of the radiator to the refrigerant inlet of the outdoor heat exchanger is provided. ..

The vehicle air conditioner according to the invention of claim 7 includes a sensor capable of detecting the temperature and / or pressure of the refrigerant circuit from the refrigerant outlet of the outdoor heat exchanger to the refrigerant suction side of the compressor in each of the above inventions. It is characterized by that.

The vehicle air conditioner according to claim 8 is characterized in that, in each of the above inventions, the vehicle air conditioner is provided with a sensor capable of detecting the temperature of the heat absorber or a physical quantity indicating the temperature of the heat absorber.

The vehicle air conditioner according to claim 9 includes an indoor blower that ventilates air to a heat absorber and a radiator and an outdoor blower that ventilates outside air to an outdoor heat exchanger in each of the above inventions, and the control device fails. The location determination mode is characterized in that the air volumes of the indoor blower and the outdoor blower are fixed to a constant value.

The vehicle air conditioner according to claim 10 has, as control valves in each of the above inventions, an outdoor expansion valve that controls the inflow of refrigerant into the outdoor heat exchanger and an indoor expansion that controls the inflow of refrigerant into the heat exchanger. It is equipped with a valve, a heating valve that is opened during heating, and a dehumidifying valve that is opened during dehumidification. The control device sets the operation mode and uses a radiator and / or an outdoor heat exchanger to dissipate the refrigerant discharged from the compressor. A cooling mode in which heat is dissipated and absorbed by a heat absorber, a dehumidifying mode in which the refrigerant discharged from the compressor is dissipated by a radiator and absorbed by an outdoor heat exchanger and a heat exchanger, and a refrigerant discharged from the compressor. It is characterized by having a heating mode in which heat is radiated by a radiator and heat is absorbed by an outdoor heat exchanger.

The vehicle air conditioner according to claim 11 has a heat exchanger for vehicle-mounted equipment for absorbing heat of a refrigerant to cool the vehicle-mounted equipment and a refrigerant for the heat exchanger for the vehicle-mounted equipment in each of the above inventions. An auxiliary expansion valve as a control valve for controlling the inflow of the refrigerant is provided, and the control device further has a vehicle-mounted equipment cooling mode in which the refrigerant is absorbed by the vehicle-mounted equipment heat exchanger as an operation mode. To do.

According to the present invention, a compressor that compresses the refrigerant, a radiator that dissipates the refrigerant and heats the air supplied to the vehicle interior, a heat exchanger that absorbs the refrigerant and cools the air supplied to the vehicle interior, and the outside of the vehicle interior. An outdoor heat exchanger provided to absorb or dissipate the refrigerant, a refrigerant circuit having a plurality of control valves for controlling the flow of the refrigerant, and a control device are provided, and the control valve is controlled by this control device. , In a vehicle air conditioner that switches between multiple operation modes, an abnormality occurs in the control device due to a failure of one of the control valves based on information on the temperature and / or pressure of the refrigerant circuit. If it is determined that the failure has occurred, each operation mode is executed in sequence, and the failure location determination mode for determining the failed control valve is executed from the temperature and / or pressure of the refrigerant circuit obtained in the executed operation mode. Therefore, it becomes possible to identify the failed control valve relatively easily and accurately.

This makes it possible to eliminate the soaring time and cost for maintenance. In this case, when the failed control valve has already been identified, unnecessary operation and time can be saved by preventing the control device from executing the failure location determination mode as in the invention of claim 2. Will be.

Further, if the control device executes the failure location determination mode on the condition that a predetermined input operation is performed as in the invention of claim 3, the operator may perform maintenance by a repair shop or the like. Only when a predetermined input operation is performed, it is possible to execute the failure location determination mode to identify the failed control valve, and the failure location determination mode is executed by an erroneous operation by the vehicle user. It becomes possible to avoid such inconvenience.

In this case, according to the invention of claim 6, the high pressure sensor capable of detecting the high pressure side pressure of the refrigerant circuit, the low pressure pressure sensor capable of detecting the low pressure side pressure of the refrigerant circuit in all the operation modes as in the invention of claim 4. A temperature sensor capable of detecting the temperature of the refrigerant circuit from the refrigerant outlet of the radiator to the refrigerant inlet of the outdoor heat exchanger, and from the refrigerant outlet of the outdoor heat exchanger to the refrigerant suction side of the compressor as in the invention of claim 7. By providing the control device with a sensor capable of detecting the temperature and / or pressure of the refrigerant circuit, and a sensor capable of detecting the temperature of the heat absorber or the physical quantity indicating the temperature of the heat absorber as in the invention of claim 8. , It becomes possible to smoothly confirm the failed control valve by the failure location determination mode.

In this case, each operation mode in the failure location determination mode is started on condition that the detection value of the high pressure pressure sensor and the detection value of the low pressure pressure sensor are within the range in which the compressor can be operated as in the invention of claim 5. Further, in the failure location determination mode as in the invention of claim 9, the air volume of the indoor blower that ventilates the air to the heat absorber and the radiator and the outdoor blower that ventilates the outside air to the outdoor heat exchanger is set to a constant value. If it is fixed, the control device can accurately identify the failed control valve in the failure location determination mode.

The above invention includes an outdoor expansion valve, an indoor expansion valve, a heating valve and a dehumidifying valve as control valves as in the invention of claim 10, and air conditioning for a vehicle that executes a cooling mode, a dehumidifying mode, and a heating mode as operation modes. It is particularly effective for an air conditioner for a vehicle, which is provided with an auxiliary expansion valve as a control valve as in the invention of claim 11 and executes a vehicle-mounted equipment cooling mode as an operation mode.

It is a block diagram of one Example of the air conditioner for a vehicle to which this invention is applied (heating mode). It is a block diagram of the air-conditioning controller as a control device of the air conditioner for a vehicle of FIG. It is a figure explaining the dehumidification mode by the air-conditioning controller of FIG. It is a figure explaining the cooling mode by the air-conditioning controller of FIG. It is a figure explaining the vehicle-mounted equipment cooling mode by the air-conditioning controller of FIG. It is a flowchart explaining the failure location determination mode executed by the air conditioning controller of FIG.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. FIG. 1 shows a configuration diagram of an air conditioner 1 for a vehicle according to an embodiment to which the present invention is applied. The vehicle of the embodiment to which the present invention is applied is an electric vehicle (EV) in which an engine (internal engine) is not mounted, and the vehicle is equipped with a battery 55 (for example, a lithium ion battery), and the battery 55 is supplied from an external power source. It is driven and traveled by supplying the electric power charged to the traveling motor (electric motor). The vehicle air conditioner 1 is also driven by being supplied with power from the battery 55.

That is, the vehicle air conditioner 1 performs the heating mode by the heat pump device HP having the refrigerant circuit R in the electric vehicle that cannot be heated by the waste heat of the engine, and further selectively selects the dehumidifying mode and the cooling mode. By executing this, the air conditioning inside the vehicle interior is performed. Furthermore, a vehicle-mounted device cooling mode for cooling the battery 55 using the heat medium circulation circuit 61 described later is also executed. Needless to say, the present invention is effective not only for the electric vehicle as a vehicle but also for a so-called hybrid vehicle that uses an engine and an electric motor for traveling.

The vehicle air conditioner 1 of the embodiment air-conditions (heating, cooling, dehumidifying, and ventilating) the interior of the electric vehicle, and is an electric compressor that is supplied with power from the battery 55 to compress the refrigerant. The (electric compressor) 2 and the high-temperature and high-pressure refrigerant discharged from the compressor 2 are provided in the air flow passage 3 of the HVAC unit 10 through which the air in the vehicle interior is ventilated and circulated, and flow in through the refrigerant pipe 13G. An outdoor expansion valve 6 as a control valve including a radiator 4 for radiating the refrigerant to heat the air supplied to the vehicle interior and an electric expansion valve for reducing and expanding the refrigerant during heating, and radiating the refrigerant during cooling. Control consisting of an outdoor heat exchanger 7 for exchanging heat between the refrigerant and the outside air so as to function as a condenser and absorb heat of the refrigerant during heating, and an electric expansion valve for decompressing and expanding the refrigerant. An indoor expansion valve 8 as a valve, a heat exchanger 9 provided in the air flow passage 3 for cooling the air supplied to the vehicle interior by absorbing heat from the outside of the vehicle interior to the refrigerant during cooling (during dehumidification). The accumulator 12 and the like are sequentially connected by the refrigerant pipe 13, and the refrigerant circuit R of the heat pump device HP is configured. The outdoor expansion valve 6 and the indoor expansion valve 8 expand the refrigerant under reduced pressure and can be fully opened or fully closed.

The outdoor heat exchanger 7 is provided with an outdoor blower 15. The outdoor blower 15 forcibly ventilates the outdoor air to the outdoor heat exchanger 7 to exchange heat between the outside air and the refrigerant, whereby the outdoor air is outdoors even when the vehicle is stopped (that is, the vehicle speed is 0 km / h). The heat exchanger 7 is configured to ventilate outside air.

Further, the refrigerant pipe 13A connected to the refrigerant outlet side of the outdoor heat exchanger 7 is connected to the refrigerant pipe 13B via the check valve 18. The check valve 18 has a forward direction on the refrigerant pipe 13B side, and the refrigerant pipe 13B is connected to the indoor expansion valve 8.

Further, the refrigerant pipe 13A coming out of the outdoor heat exchanger 7 is branched, and the branched refrigerant pipe 13D is connected to the heat absorber 9 via a heating valve 21 as a control valve including an electromagnetic valve opened at the time of heating. It is communicatively connected to the refrigerant pipe 13C located on the outlet side. Then, the check valve 20 is connected to the refrigerant pipe 13C downstream from the connection point of the refrigerant pipe 13D, the refrigerant pipe 13C downstream from the check valve 20 is connected to the accumulator 12, and the accumulator 12 is the compressor 2. It is connected to the refrigerant suction side of. The check valve 20 has the accumulator 12 side in the forward direction.

Further, the refrigerant pipe 13E on the outlet side of the radiator 4 is branched into the refrigerant pipe 13J and the refrigerant pipe 13F at a branch portion B2 located in front of the outdoor expansion valve 6 (the refrigerant outlet side of the radiator 4 on the upstream side of the refrigerant). One of the branched refrigerant pipes 13J is connected to the refrigerant inlet side of the outdoor heat exchanger 7 via the outdoor expansion valve 6. Further, the other branched refrigerant pipe 13F is on the downstream side of the refrigerant of the check valve 18 via the dehumidifying valve 22 as a control valve composed of a solenoid valve opened at the time of dehumidification, and is on the upstream side of the refrigerant of the indoor expansion valve 8. It is communicatively connected to the located refrigerant pipe 13B.

As a result, the refrigerant pipe 13F is connected in parallel to the series circuit of the outdoor expansion valve 6, the outdoor heat exchanger 7, and the check valve 18, and the outdoor expansion valve 6, the outdoor heat exchanger 7, and the check valve are connected in parallel. It is a bypass circuit that bypasses 18.

Further, in the air flow passage 3 on the air upstream side of the heat absorber 9, each suction port of the outside air suction port and the inside air suction port is formed (represented by the suction port 25 in FIG. 1), and this suction port is formed. The suction switching damper 26 for switching the air introduced into the air flow passage 3 into the inside air (inside air circulation), which is the air inside the vehicle interior, and the outside air (outside air introduction), which is the air outside the vehicle interior, is provided. Further, an indoor blower fan 27 for supplying the introduced inside air and outside air to the air flow passage 3 is provided on the air downstream side of the suction switching damper 26.

Further, in FIG. 1, 23 is an auxiliary heater as an auxiliary heating device. The auxiliary heater 23 is composed of an electric heater such as a PTC heater, and is provided in the air flow passage 3 on the windward side of the radiator 4 with respect to the air flow in the air flow passage 3 in the embodiment. .. Then, by energizing the auxiliary heater 23, the heating of the vehicle interior can be assisted.

Further, in the air flow passage 3 on the air upstream side of the radiator 4, the air (inside air or outside air) in the air flow passage 3 after flowing into the air flow passage 3 and passing through the heat absorber 9 is assisted. An air mix damper 28 for adjusting the ratio of ventilation to the heater 23 and the radiator 4 is provided. Further, FOOT (foot), VENT (vent), and DEF (diff) outlets (represented by the outlet 29 in FIG. 1) are formed in the air flow passage 3 on the air downstream side of the radiator 4. The outlet 29 is provided with an outlet switching damper 31 for switching and controlling the blowing of air from each of the outlets.

Further, the vehicle air conditioner 1 includes a heat medium circulation circuit 61 for circulating a heat medium in the battery 55 to adjust the temperature of the battery 55. That is, in the embodiment, the battery 55 is the vehicle-mounted device according to the present invention.

The heat medium circulation circuit 61 of this embodiment includes a circulation pump 62 as a circulation device and a refrigerant-heat medium heat exchanger 64 as a heat exchanger for vehicle-mounted equipment, and the battery 55 is connected to the heat medium pipe 68. Is connected.

In the case of the embodiment, the heat medium pipe 68A is connected to the discharge side of the circulation pump 62, and the heat medium pipe 68A is connected to the inlet of the heat medium flow path 64A of the refrigerant-heat medium heat exchanger 64. A heat medium pipe 68B is connected to the outlet of the heat medium flow path 64A, and the heat medium pipe 68B is connected to the inlet of the battery 55. The outlet of the battery 55 is connected to the heat medium pipe 68C, and the heat medium pipe 68C is connected to the suction side of the circulation pump 62.

As the heat medium used in the heat medium circulation circuit 61, for example, water, a refrigerant such as HFO-1234yf, a liquid such as coolant, or a gas such as air can be adopted. In the embodiment, water is used as a heat medium. Further, it is assumed that, for example, a jacket structure is provided around the battery 55 so that a heat medium can be distributed in a heat exchange relationship with the battery 55.

On the other hand, the outlet of the refrigerant pipe 13F of the refrigerant circuit R, that is, the branch portion of the refrigerant pipe 13B located on the refrigerant downstream side of the connection portion between the refrigerant pipe 13F and the refrigerant pipe 13B and on the refrigerant upstream side of the indoor expansion valve 8. One end of the branch pipe 72 is connected to B1. The branch pipe 72 is provided with an auxiliary expansion valve 73 as a control valve composed of an electric expansion valve. The auxiliary expansion valve 73 expands the refrigerant flowing into the above-mentioned refrigerant flow path 64B of the refrigerant-heat medium heat exchanger 64 under reduced pressure, and can be fully closed.

The other end of the branch pipe 72 is connected to the refrigerant flow path 64B of the refrigerant-heat medium heat exchanger 64, and one end of the refrigerant pipe 74 is connected to the outlet of the refrigerant flow path 64B to form the refrigerant pipe 74. The other end is the downstream side of the refrigerant of the check valve 20, and is connected to the refrigerant pipe 13C in front of the accumulator 12 (upstream side of the refrigerant). Then, these auxiliary expansion valves 73 and the like also form a part of the refrigerant circuit R of the heat pump device HP, and at the same time, form a part of the heat medium circulation circuit 61.

The branch portion B1 is located on the refrigerant outlet side of the outdoor heat exchanger 7, and the endothermic absorber 9 and the refrigerant-heat medium heat exchanger 64 are connected in parallel on the downstream side of the refrigerant of the branch portion B1. Further, in the embodiment, the refrigerant pipe 13F communicates with the branch portion B1 via the refrigerant pipe 13B.

When the auxiliary expansion valve 73 is open, the refrigerant (part or all of the refrigerant) discharged from the refrigerant pipe 13F and the outdoor heat exchanger 7 flows into the branch pipe 27, is depressurized by the auxiliary expansion valve 73, and then the refrigerant. -It flows into the refrigerant flow path 64B of the heat medium heat exchanger 64 and evaporates there. The refrigerant absorbs heat from the heat medium flowing through the heat medium flow path 64A in the process of flowing through the refrigerant flow path 64B, and then is sucked into the compressor 2 via the accumulator 12.

Next, in FIG. 2, reference numeral 32 denotes an air conditioning controller 32 as a control device that controls the vehicle air conditioner 1. The air conditioning controller 32 is composed of a microcomputer as an example of a computer including a processor.

The input of the air conditioning controller 32 (control device) is sucked into the air flow passage 3 from the outside air temperature sensor 33 that detects the outside air temperature (Tam) of the vehicle, the outside air humidity sensor 34 that detects the outside air humidity, and the suction port 25. The HVAC suction temperature sensor 36 that detects the temperature of the air, the inside air temperature sensor 37 that detects the temperature of the air (inside air) in the vehicle interior, the inside air humidity sensor 38 that detects the humidity of the air inside the vehicle interior, and the refrigerant in the vehicle interior. The indoor CO ₂ concentration sensor 39 that detects the carbon concentration, the blowout temperature sensor 41 that detects the temperature of the air blown into the vehicle interior from the blowout port 29, and the discharge refrigerant pressure (discharge pressure Pd) of the compressor 2 are detected. The discharge pressure sensor 42, the discharge temperature sensor 43 that detects the discharge refrigerant temperature of the compressor 2, and the suction refrigerant temperature of the compressor 2 (the refrigerant circuit from the refrigerant outlet of the outdoor heat exchanger 7 to the refrigerant suction side of the compressor 2). The suction temperature sensor 44 as a sensor for detecting the temperature of R) and the suction refrigerant pressure of the compressor 2 (the pressure of the refrigerant circuit R from the refrigerant outlet of the outdoor heat exchanger 7 to the refrigerant suction side of the compressor 2) are detected. The suction pressure sensor 45 as a low-pressure pressure sensor and the temperature of the radiator 4 (the temperature of the refrigerant passing through the radiator 4: the temperature of the refrigerant circuit R from the refrigerant outlet of the radiator 4 to the refrigerant inlet of the outdoor heat exchanger 7: The radiator temperature sensor 46 as a temperature sensor that detects the radiator temperature TCI) and the radiator pressure as a high-pressure pressure sensor that detects the refrigerant pressure of the radiator 4 (high-pressure side pressure of the refrigerant times R: radiator pressure PCI). Heat absorption as a sensor for detecting the temperature of the sensor 47 and the heat absorber 9 (the temperature of the heat absorber 9 itself or the temperature of the air passing through the heat absorber 9 which is a physical quantity indicating the temperature of the heat absorber 9: the heat absorber temperature Te). The device temperature sensor 48, the heat absorber pressure sensor 49 that detects the refrigerant pressure of the heat absorber 9 (the pressure of the refrigerant in the heat absorber 9 or immediately after leaving the heat absorber 9), and the amount of solar radiation into the vehicle interior are detected. For example, a photosensor type solar radiation sensor 51, a vehicle speed sensor 52 for detecting the moving speed (vehicle speed) of the vehicle, an air conditioning operation unit 53 for setting a set temperature and switching of air conditioning operation, and outdoor heat. The temperature of the exchanger 7 (the temperature of the refrigerant immediately after exiting the outdoor heat exchanger 7 or the temperature of the outdoor heat exchanger 7 itself: the outdoor heat exchanger temperature TXO. When the outdoor heat exchanger 7 functions as an evaporator , The outdoor heat exchanger temperature TXO is the evaporation temperature of the refrigerant in the outdoor heat exchanger 7), and the refrigerant pressure of the outdoor heat exchanger 7 (inside the outdoor heat exchanger 7 or in the outdoor heat exchanger 7). , The refrigerant immediately after coming out of the outdoor heat exchanger 7 Each output of the outdoor heat exchanger pressure sensor 56 that detects pressure) is connected.

Further, the temperature of the battery 55 (the temperature of the battery 55 itself, the temperature of the heat medium leaving the battery 55, or the temperature of the heat medium entering the battery 55: battery temperature Tb) is further input to the air conditioning controller 32. Each output of the battery temperature sensor 76 to detect and the heat medium outlet temperature sensor 77 to detect the temperature of the heat medium (heat medium temperature Tw) exiting the heat medium flow path 64A of the refrigerant-heat medium heat exchanger 64 is also connected. ing.

On the other hand, the output of the air conditioning controller 32 includes the compressor 2, the outdoor blower 15, the indoor blower (blower fan) 27, the suction switching damper 26, the air mix damper 28, the air outlet switching damper 31, and the outdoor. The expansion valve 6, the indoor expansion valve 8, the dehumidifying valve 22, the heating valve 21, each solenoid valve, the circulation pump 62, the auxiliary expansion valve 73, and the auxiliary heater 23 are connected. The air conditioning controller 32 controls the outputs of the sensors and the settings input by the air conditioning operation unit 53.

With the above configuration, the operation of the vehicle air conditioner 1 of the embodiment will be described next. In this embodiment, the air conditioning controller 32 (control device) switches and executes each operation mode of the heating mode, the dehumidification mode, and the cooling mode, and cools the battery 55 (vehicle-mounted device) in the vehicle-mounted device cooling mode (vehicle-mounted device cooling mode). Execute operation mode). First, an operation mode for air-conditioning the interior of the vehicle will be described.

(1) Heating mode First, the heating mode will be described with reference to FIG. FIG. 1 shows the flow of the refrigerant (broken line arrow) in the refrigerant circuit R in the heating mode. When the heating mode is selected by the air conditioning controller 32 (auto mode) or by manual operation to the air conditioning operation unit 53 (manual mode) at low outside temperature such as in winter, the air conditioning controller 32 opens the heating valve 21. The indoor expansion valve 8 is fully closed. Also, the dehumidifying valve 22 is closed.

Then, the compressor 2 and the

blowers

15 and 27 are operated, and the air mix damper 28 adjusts the ratio of the air blown from the indoor blower 27 to the auxiliary heater 23 and the radiator 4. As a result, the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 flows into the radiator 4. Since the air in the air flow passage 3 is ventilated through the radiator 4, the air in the air flow passage 3 is heated by the high temperature refrigerant in the radiator 4, while the refrigerant in the radiator 4 heats the air. It is deprived, cooled, and condensed.

The refrigerant liquefied in the radiator 4 exits the radiator 4 and then reaches the outdoor expansion valve 6 via the

refrigerant pipes

13E and 13J. The refrigerant that has flowed into the outdoor expansion valve 6 is decompressed there, and then flows into the outdoor heat exchanger 7. The refrigerant that has flowed into the outdoor heat exchanger 7 evaporates and draws heat by running or from the outside air that is ventilated by the outdoor blower 15 (endothermic). Then, the low-temperature refrigerant that has exited the outdoor heat exchanger 7 reaches the refrigerant pipe 13C via the refrigerant pipe 13A, the refrigerant pipe 13D, and the heating valve 21, and enters the accumulator 12 via the check valve 20 of the refrigerant pipe 13C. After the gas-liquid separation, the circulation in which the gas refrigerant is sucked into the compressor 2 is repeated. Since the air heated by the radiator 4 is blown out from the outlet 29, the interior of the vehicle is heated by this.

The air conditioning controller 32 has a target radiator pressure PCO (target value of the pressure PCI of the radiator 4) from the target heater temperature TCO (target value of the air temperature on the leeward side of the radiator 4) calculated from the target blowout temperature TAO described later. Is calculated, and the rotation speed of the compressor 2 is calculated based on the target radiator pressure PCO and the refrigerant pressure of the radiator 4 (radiator pressure PCI. High pressure side pressure of the refrigerant circuit R) detected by the radiator pressure sensor 47. In addition to controlling, the valve opening of the outdoor expansion valve 6 is controlled based on the temperature of the radiator 4 (radiator temperature TCI) detected by the radiator temperature sensor 46 and the radiator pressure PCI detected by the radiator pressure sensor 47. , The degree of supercooling of the refrigerant at the outlet of the radiator 4 is controlled. The target heater temperature TCO is basically TCO = TAO, but a predetermined control limit is provided. When the heating capacity of the radiator 4 is insufficient, the auxiliary heater 23 is energized to generate heat to supplement the heating capacity.

In this heating mode, the air conditioning controller 32 opens the dehumidifying valve 22 and auxiliary expansion when, for example, the battery temperature Tb (which may be the heat medium temperature Tw) detected by the battery temperature sensor 76 rises and exceeds a predetermined threshold value. The valve 73 is also opened to control the valve opening degree. As a result, a part of the refrigerant discharged from the radiator 4 is diverted on the upstream side of the refrigerant of the outdoor expansion valve 6, and reaches the upstream side of the refrigerant of the indoor expansion valve 8 via the refrigerant pipe 13F. The refrigerant then enters the branch pipe 72, is depressurized by the auxiliary expansion valve 73, and then flows into the refrigerant flow path 64B of the refrigerant-heat medium heat exchanger 64 through the branch pipe 72 and evaporates. At this time, it exerts an endothermic effect. The refrigerant evaporated in the refrigerant flow path 64B repeats circulation that is sucked into the compressor 2 through the refrigerant pipe 74, the refrigerant pipe 13C, and the accumulator 12 in that order.

Further, the air conditioning controller 32 operates a circulation pump 62 to circulate the heat medium through the heat medium flow path 64A of the refrigerant-heat medium heat exchanger 64 and the battery 55. As a result, the heat medium that has been endothermic from the refrigerant and whose temperature has dropped is circulated to the battery 55, so that the battery 55 is cooled.

(2) Dehumidification mode Next, the dehumidification mode will be described with reference to FIG. FIG. 3 shows the flow of the refrigerant (broken line arrow) in the refrigerant circuit R in the dehumidification mode. In the dehumidification mode, the air conditioning controller 32 opens the dehumidification valve 22 in the heating mode state (the state in which the battery 55 is not cooled) and opens the indoor expansion valve 8 to reduce the pressure and expand the refrigerant. As a result, a part of the condensed refrigerant flowing through the refrigerant pipe 13E via the radiator 4 is diverted, and the diverted refrigerant flows into the refrigerant pipe 13F through the dehumidifying valve 22 and flows from the refrigerant pipe 13B to the indoor expansion valve 8. , The remaining refrigerant flows to the outdoor expansion valve 6. That is, a part of the divided refrigerant is depressurized by the indoor expansion valve 8 and then flows into the heat absorber 9 and evaporates.

The air conditioning controller 32 controls the valve opening degree of the indoor expansion valve 8 so as to maintain the superheat degree (SH) of the refrigerant at the outlet of the heat absorber 9 at a predetermined value, and the endothermic action of the refrigerant generated in the heat absorber 9 at this time. Moisture in the air blown out from the indoor blower 27 condenses and adheres to the heat absorber 9, so that the air is cooled and dehumidified. The remaining refrigerant that has been split and flows into the refrigerant pipe 13J is decompressed by the outdoor expansion valve 6 and then evaporated by the outdoor heat exchanger 7.

The refrigerant evaporated in the heat absorber 9 goes out to the refrigerant pipe 13C, merges with the refrigerant from the refrigerant pipe 13D (refrigerant from the outdoor heat exchanger 7), and then is sucked into the compressor 2 via the check valve 20 and the accumulator 12. Repeat the cycle. The air dehumidified by the heat absorber 9 is reheated in the process of passing through the radiator 4, so that the dehumidifying and heating of the vehicle interior is performed.

The air conditioning controller 32 controls the rotation speed of the compressor 2 based on the target radiator pressure PCO calculated from the target heater temperature TCO and the radiator pressure PCI (high pressure of the refrigerant circuit R) detected by the radiator pressure sensor 47. At the same time, the valve opening degree of the outdoor expansion valve 6 is controlled based on the temperature of the heat absorber 9 (heat absorber temperature Te) detected by the heat absorber temperature sensor 48.

(3) Cooling Mode Next, the cooling mode will be described with reference to FIG. In this cooling mode, which is executed at a high outside temperature such as in summer, the air conditioning controller 32 fully opens the valve opening degree of the outdoor expansion valve 6. Further, the indoor expansion valve 8 is opened to expand the refrigerant under reduced pressure, and the heating valve 21 and the dehumidifying valve 22 are closed. Then, the compressor 2 and the

blowers

15 and 27 are operated, and the air mix damper 28 adjusts the ratio of the air blown from the indoor blower 27 to the auxiliary heater 23 and the radiator 4.

As a result, the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 flows into the radiator 4 as shown by the broken line arrow in FIG. In the cooling mode, the air in the air flow passage 3 is hardly ventilated to the radiator 4, or the ratio is small even when the air is ventilated (because of only reheating during cooling). The refrigerant that has dissipated heat for the reheat during cooling by the radiator 4 reaches the outdoor expansion valve 6 via the refrigerant pipe 13E. At this time, since the outdoor expansion valve 6 is fully opened, the refrigerant passes through the outdoor expansion valve 6 as it is, passes through the refrigerant pipe 13J, flows into the outdoor heat exchanger 7, and is ventilated there by traveling or by the outdoor blower 15. It is air-cooled by the outside air to be condensed and liquefied.

The refrigerant exiting the outdoor heat exchanger 7 enters the refrigerant pipe 13B via the refrigerant pipe 13A and the check valve 18, and reaches the indoor expansion valve 8. After the refrigerant is depressurized by the indoor expansion valve 8, it flows into the heat absorber 9 and evaporates. Due to the endothermic action at this time, the moisture in the air blown out from the indoor blower 27 condenses and adheres to the endothermic device 9, and the air is cooled.

The refrigerant evaporated in the heat absorber 9 reaches the accumulator 12 via the refrigerant pipe 13C and the check valve 20, and is repeatedly sucked into the compressor 2 through the accumulator 12. The air cooled by the heat absorber 9 and dehumidified is blown out into the vehicle interior from the air outlet 29, so that the vehicle interior is cooled. In this cooling mode, the air conditioning controller 32 controls the rotation speed of the compressor 2 based on the temperature of the heat absorber 9 (heat absorber temperature Te) detected by the heat absorber temperature sensor 48.

Even in this cooling mode, the air conditioning controller 32 opens the auxiliary expansion valve 73 when, for example, the battery temperature Tb (which may be the heat medium temperature Tw) detected by the battery temperature sensor 76 rises and exceeds a predetermined threshold value. The valve opening is controlled. As a result, a part of the refrigerant discharged from the outdoor heat exchanger 7 is diverted on the upstream side of the refrigerant of the indoor expansion valve 8 and enters the branch pipe 72, is depressurized by the auxiliary expansion valve 73, and then the refrigerant passes through the branch pipe 72. -It flows into the refrigerant flow path 64B of the heat medium heat exchanger 64 and evaporates. At this time, it exerts an endothermic effect. The refrigerant evaporated in the refrigerant flow path 64B repeats circulation that is sucked into the compressor 2 through the refrigerant pipe 74, the refrigerant pipe 13C, and the accumulator 12 in that order.

(4) Switching control of air conditioning operation The air conditioning controller 32 calculates the target blowout temperature TAO described above from the following formula (I). This target outlet temperature TAO is a target value of the temperature of the air blown into the vehicle interior from the outlet 29.
TAO = (Tset-Tin) x K + Tbal (f (Tset, SUN, Tam))
・・ (I)
Here, Tset is the set temperature in the vehicle interior set by the air conditioning operation unit 53, Tin is the temperature of the vehicle interior air detected by the inside air temperature sensor 37, K is a coefficient, Tbal is the set temperature Tset, and the solar radiation sensor 51 detects it. It is a balance value calculated from the amount of solar radiation SUN and the outside air temperature Tam detected by the outside air temperature sensor 33. In general, the target outlet temperature TAO increases as the outside air temperature Tam decreases, and decreases as the outside air temperature Tam increases.

Then, the air conditioning controller 32 selects one of the above operation modes based on the outside air temperature Tam detected by the outside air temperature sensor 33 and the target blowout temperature TAO at the time of activation. Further, after the start-up, each of the operation modes is selected and switched according to changes in the environment and setting conditions such as the outside air temperature Tam and the target blowout temperature TAO.

(5) Vehicle-mounted equipment cooling mode The air-conditioning controller 32 executes the vehicle-mounted equipment cooling mode when charging the battery 55 with, for example, a quick charger or the like. FIG. 5 shows the flow of the refrigerant in the refrigerant circuit R (broken line arrow) and the flow of the heat medium in the heat medium circulation circuit 61 (solid line arrow) in the vehicle-mounted equipment mode. In the vehicle-mounted equipment cooling mode, the air conditioning controller 32 opens the auxiliary expansion valve 73 to decompress and expand the refrigerant, and opens the dehumidifying valve 22. Further, the outdoor expansion valve 6 and the indoor expansion valve 8 are fully closed, and the heating valve 21 is also closed. Then, the compressor 2 is operated.

As a result, the high-temperature and high-pressure gas refrigerant discharged from the compressor 2 flows into the radiator 4. All the refrigerant radiated by the radiator 4 flows into the refrigerant pipe 13F through the refrigerant pipe 13E, and enters the refrigerant pipe 13B through the refrigerant pipe 13F. The refrigerant that has flowed into the refrigerant pipe 13B flows into the branch pipe 72 and reaches the auxiliary expansion valve 73. Here, after the refrigerant is depressurized, it flows into the refrigerant flow path 64B of the refrigerant-heat medium heat exchanger 64 and evaporates there. At this time, it exerts an endothermic effect. The refrigerant evaporated in the refrigerant flow path 64B repeats circulation that is sucked into the compressor 2 through the refrigerant pipe 74, the refrigerant pipe 13C, and the accumulator 12 in that order.

On the other hand, the air conditioning controller 32 operates the circulation pump 62. The heat medium discharged from the circulation pump 62 reaches the heat medium flow path 64A of the refrigerant-heat medium heat exchanger 64 in the heat medium pipe 68, where heat is absorbed by the refrigerant evaporating in the refrigerant flow path 64B, and the heat medium is absorbed. Will be cooled. The heat medium exiting the heat medium flow path 64A of the refrigerant-heat medium heat exchanger 64 reaches the battery 55 and exchanges heat with the battery 55. As a result, the battery 55 is cooled, and the heat medium after cooling the battery 55 repeats circulation sucked into the circulation pump 62 (indicated by a solid arrow in FIG. 5).

In this vehicle-mounted equipment cooling mode, the air conditioning controller 32 controls the rotation speed of the compressor 2 based on the heat medium temperature Tw (which may be the battery temperature Tb) detected by the heat medium outlet temperature sensor 77, thereby controlling the battery 55. To cool. As a result, the battery 55 can be strongly cooled.

(6) Failure location determination mode Next, the failure location determination mode executed by the air conditioning controller 32 will be described with reference to the flowchart of FIG. In the air conditioning controller 32, the value input from each of the sensors described above indicates an abnormality, and the abnormality is any one of the outdoor expansion valve 6, the indoor expansion valve 8, the auxiliary expansion valve 73, the heating valve 21, and the dehumidifying valve 22. When it is determined that the cause may be a failure of the control valve, the failure location determination mode for identifying which control valve has failed is executed.

If, for example, it is possible to electrically grasp which control valve is out of order, the air conditioning controller 32 does not execute the failure location determination mode, and the air conditioning operation unit 53 displays a predetermined error. Do.

Further, in the air conditioning controller 32, the values of the high pressure side pressure of the refrigerant circuit R detected by the radiator pressure sensor 47 (high pressure pressure sensor) and the low pressure side pressure of the refrigerant circuit R detected by the suction pressure sensor 45 (low pressure pressure sensor) are set. , The failure location determination mode is executed on condition that the compressor 2 is returned to the operable range (the range that is not a high pressure abnormality or a low pressure abnormality).

Next, the operation of this failure location determination mode will be specifically described. First, the air conditioning controller 32 fixes the air volumes of the outdoor blower 15 and the indoor blower 27 to a constant value. Then, in step S1 of FIG. 6, the air conditioning controller 32 first operates the compressor 2 with the operation mode as the cooling mode. Next, the high pressure side pressure of the refrigerant circuit R detected by the radiator pressure sensor 47 in step S2 has risen to a predetermined abnormal value, or the low pressure side pressure of the refrigerant circuit R detected by the suction pressure sensor 45 has a predetermined abnormality. It is determined whether or not there is an abnormality in which the value has dropped to the value or the heat absorber temperature Te detected by the heat absorber temperature sensor 48 does not drop.

If there is such an abnormality in the cooling mode, there is a possibility that the indoor expansion valve 8 or the outdoor expansion valve 6 has failed, so the air conditioning controller 32 proceeds to step S3, and this time, the operation mode is switched to the dehumidification mode. Next, in step S4, it is determined whether or not the endothermic temperature Te has decreased. If the heat absorber temperature Te does not drop in the dehumidification mode, it can be said that the indoor expansion valve 8 has closed (does not operate while fully closed). Therefore, the air conditioning controller 32 proceeds to step S5, and the indoor expansion valve 8 moves. It is identified as having a failure, and a predetermined error display to that effect is displayed on the air conditioning operation unit 53.

When the heat absorber temperature Te is lowered in step S4 of FIG. 6, it can be determined that the indoor expansion valve 8 is normal, so that the air conditioning controller 32 proceeds to step S6 and the outdoor expansion valve 6 is out of order. In particular, the air conditioning operation unit 53 is displayed with a predetermined error to that effect.

Next, even if there is no abnormality in the cooling mode in step S2, the air conditioning controller 32 proceeds to step S7 to switch the operation mode to the dehumidification mode. Next, in step S8, it is determined whether or not there is an abnormality in which the endothermic temperature Te does not decrease. If there is no abnormality in the cooling mode, that is, when the dehumidification mode is set with no abnormality in the outdoor expansion valve 6 or the indoor expansion valve 8, the dehumidifier temperature Te does not decrease, which means that the dehumidification valve 22 is closed (closed). Since it can be said that the air conditioning controller 32 does not operate as it is), the air conditioning controller 32 proceeds to step S10, identifies that the dehumidifying valve 22 is out of order, and displays a predetermined error to that effect on the air conditioning operation unit 53.

On the other hand, if there is no abnormality in step S8 (the heat absorber temperature Te drops), the air conditioning controller 32 proceeds to step S9 and switches the operation mode to the heating mode this time. Next, in step S11, the high pressure side pressure of the refrigerant circuit R has risen to a predetermined abnormal value, or the low pressure side pressure of the refrigerant circuit R detected by the suction pressure sensor 45 has decreased to a predetermined abnormal value. Determine if there is any abnormality.

If there is no abnormality in the cooling mode and the dehumidifying mode, and there is an abnormality in the heating mode, it can be said that the heating valve 21 has closed (does not operate while closed). Therefore, the air conditioning controller 32 proceeds to step S13. It is determined that the heating valve 21 is out of order, and a predetermined error display to that effect is displayed on the air conditioning operation unit 53.

On the other hand, if there is no abnormality in step S11, the air conditioning controller 32 proceeds to step S12, and this time, the operation mode is switched to the vehicle-mounted equipment cooling mode. Next, in step S14, the high pressure side pressure of the refrigerant circuit R rose to a predetermined abnormal value, or the low pressure side pressure of the refrigerant circuit R detected by the suction pressure sensor 45 decreased to a predetermined abnormal value. Determine if there is any abnormality.

If there is no abnormality in the cooling mode, dehumidification mode, and heating mode, and there is an abnormality in the vehicle-mounted equipment cooling mode, it can be said that the auxiliary expansion valve 73 has closed (does not operate while fully closed). The controller 32 proceeds to step S15, identifies that the auxiliary expansion valve 73 is out of order, and displays a predetermined error to that effect on the air conditioning operation unit 53.

If there is no abnormality in step S14, the air conditioning controller 32 proceeds to step S16 to determine that each control valve is normal, and predetermines that an abnormality other than the control valve has occurred in the air conditioning operation unit 53. Error display shall be performed.

As described in detail above, in the present invention, the air conditioning controller 32 is among the outdoor expansion valve 6, the indoor expansion valve 8, the auxiliary expansion valve 73, the heating valve 21, and the dehumidifying valve 22 based on the information regarding the temperature and pressure of the refrigerant circuit R. When it is determined that an abnormality caused by a failure of any of the control valves has occurred, each operation mode of the cooling mode, the dehumidifying mode, the heating mode, and the vehicle-mounted equipment cooling mode is sequentially executed as shown in the flowchart of FIG. At the same time, since the failure location determination mode for determining the failed control valve is executed from the temperature and pressure of the refrigerant circuit R obtained in the executed operation mode, the failed control valve can be identified relatively easily and accurately. You will be able to do it.

This makes it possible to eliminate the soaring time and cost for maintenance (part replacement). In this case, in the embodiment, when the failed control valve has already been identified, the air conditioning controller 32 does not execute the failure location determination mode, so that unnecessary operation and time can be saved.

Further, in the embodiment, a radiator pressure sensor 47 capable of detecting the high pressure side pressure of the refrigerant circuit R and a suction pressure sensor 45 capable of detecting the low pressure side pressure of the refrigerant circuit R are provided in all operation modes, and the radiator R is provided. The radiator temperature sensor 46 that can detect the temperature of the refrigerant circuit R from the refrigerant outlet of the outdoor heat exchanger 7 to the refrigerant inlet of the outdoor heat exchanger 7, and the refrigerant circuit from the refrigerant outlet of the outdoor heat exchanger 7 to the refrigerant suction side of the compressor 2. Since the suction temperature sensor 44 that can detect the temperature and pressure of R, the suction pressure sensor 45, and the heat absorber temperature sensor 48 that can detect the heat absorber temperature Te are connected to the air conditioning controller 32, the failure due to the failure location determination mode It is possible to smoothly determine the control valve.

Further, in the embodiment, each operation mode in the failure location determination mode is started on condition that the detection value of the radiator pressure sensor 47 and the detection value of the suction pressure sensor 45 are within the range in which the compressor 2 can be operated. Furthermore, in the failure location determination mode, the air volumes of the indoor blower 27 and the outdoor blower 15 are fixed to a constant value, so that the control valve in which the air conditioner controller 32 has failed in the failure location determination mode can be accurately controlled. You will be able to identify.

In the above invention, as in the embodiment, the outdoor expansion valve 6, the indoor expansion valve 8, the heating valve 21, and the dehumidifying valve 22 are provided as control valves, and the cooling mode, the dehumidifying mode, and the heating mode are executed as the operation modes, and further controlled. It is particularly effective for the vehicle air conditioner 1 which includes an auxiliary expansion valve 73 as a valve and executes a vehicle-mounted equipment cooling mode as an operation mode.

In the above embodiment, when an abnormality caused by a failure of any of the control valves occurs, the air conditioning controller 32 automatically executes the failure location determination mode, but the present invention is not limited to this, and the air conditioning operation unit 53 Or, the air conditioning controller 32 may start the failure location determination mode on condition that a predetermined input operation is performed to an external personal computer or the like connected to the air conditioning controller 32.

In that case, the air conditioning controller 32 shall notify the air conditioning operating unit 53 that an abnormality may have occurred in any of the control valves by displaying a predetermined error. By doing so, it is possible to execute the failure location determination mode and identify the failed control valve only when a predetermined input operation is performed by the operator during maintenance by a repair shop or the like. Therefore, it is possible to avoid the inconvenience that the failure location determination mode is executed due to an erroneous operation by the vehicle user.

Further, in the embodiment, the battery 55 is taken up as a vehicle-mounted device, but the present invention is not limited to this, and the present invention is also effective for an electric motor for traveling and an inverter device for driving the electric motor. Further, the configuration of the air conditioning controller 32 described in the examples, the configuration of the heat pump device HP of the vehicle air conditioner 1 and the configuration of the heat medium circulation circuit 61 are not limited thereto, and are modified without departing from the spirit of the present invention. It goes without saying that it is possible.

1 Vehicle air conditioner 2 Compressor 4 Heat radiator 6 Outdoor expansion valve (control valve)
7 Outdoor heat exchanger 8 Indoor expansion valve (control valve)
9 Heat absorber 21 Heating valve (control valve)
22 Dehumidifying valve (control valve)
32 Air conditioning controller (control device)
44 Suction temperature sensor (sensor)
45 Suction pressure sensor (low pressure pressure sensor)
46 Dissipator temperature sensor (temperature sensor)
47 Dissipator pressure sensor (high pressure pressure sensor)
55 Battery (Vehicle-mounted equipment)
61 Heat medium circulation circuit 64 Refrigerant-heat medium heat exchanger (heat exchanger for vehicle-mounted equipment)
73 Auxiliary expansion valve (control valve)

Claims

A compressor that compresses the refrigerant, a radiator that dissipates the refrigerant and heats the air supplied to the passenger compartment, a heat exchanger that absorbs the refrigerant and cools the air supplied to the passenger compartment, and a heat absorber provided outside the passenger compartment to supply the refrigerant. A plurality of operations are provided by providing an outdoor heat exchanger that absorbs or dissipates heat, a refrigerant circuit having a plurality of control valves for controlling the flow of the refrigerant, and a control device, and controlling the control valve by the control device. In a vehicle air conditioner that switches modes and executes
Based on the information on the temperature and / or pressure of the refrigerant circuit, the control device sequentially executes each of the operation modes when it is determined that an abnormality caused by a failure of any of the control valves has occurred. At the same time, the air conditioner for a vehicle is characterized in that a failure location determination mode for determining the failed control valve is executed from the temperature and / or pressure of the refrigerant circuit obtained in the executed operation mode.
The vehicle air conditioner according to claim 1, wherein the control device does not execute the failure location determination mode when the failed control valve is specified.
The vehicle air conditioner according to claim 1 or 2, wherein the control device executes the failure location determination mode on condition that a predetermined input operation is performed.
Claims 1 to claim that the high pressure sensor capable of detecting the high pressure side pressure of the refrigerant circuit and the low pressure pressure sensor capable of detecting the low pressure side pressure of the refrigerant circuit are provided in all the operation modes. The vehicle air conditioner according to any one of item 3.
The control device starts each of the operation modes in the failure location determination mode on condition that the detection value of the high pressure pressure sensor and the detection value of the low pressure pressure sensor are within the range in which the compressor can be operated. The vehicle air conditioner according to claim 4.
The invention according to any one of claims 1 to 5, wherein a temperature sensor capable of detecting the temperature of the refrigerant circuit from the refrigerant outlet of the radiator to the refrigerant inlet of the outdoor heat exchanger is provided. Air conditioner for vehicles.
Claims 1 to 6 include a sensor capable of detecting the temperature and / or pressure of the refrigerant circuit from the refrigerant outlet of the outdoor heat exchanger to the refrigerant suction side of the compressor. The vehicle air conditioner described in any of them.
The vehicle air conditioner according to any one of claims 1 to 7, further comprising a sensor capable of detecting the temperature of the heat absorber or a physical quantity indicating the temperature of the heat absorber.
An indoor blower that blows air through the heat absorber and the radiator, and an outdoor blower that blows outside air through the outdoor heat exchanger are provided.
The vehicle according to any one of claims 1 to 8, wherein the control device fixes the air volume of the indoor blower and the outdoor blower to a constant value in the failure location determination mode. Air conditioner for.
As the control valve
An outdoor expansion valve that controls the inflow of refrigerant into the outdoor heat exchanger,
An indoor expansion valve that controls the inflow of refrigerant into the heat absorber,
A heating valve that opens during heating and
Equipped with a dehumidifying valve that opens during dehumidification
The control device is set as the operation mode.
A cooling mode in which the refrigerant discharged from the compressor is dissipated by the radiator and / or the outdoor heat exchanger and is absorbed by the endothermic device.
A dehumidification mode in which the refrigerant discharged from the compressor is dissipated by the radiator and heat is absorbed by the outdoor heat exchanger and the endothermic device.
The invention according to any one of claims 1 to 9, further comprising a heating mode in which the refrigerant discharged from the compressor is dissipated by the radiator and the heat is absorbed by the outdoor heat exchanger. Air conditioner for vehicles.
It is provided with a heat exchanger for vehicle-mounted equipment for absorbing heat of the refrigerant to cool the vehicle-mounted equipment, and an auxiliary expansion valve as the control valve for controlling the inflow of the refrigerant into the heat exchanger for the vehicle-mounted equipment. ,
The control device according to any one of claims 1 to 10, further comprising a vehicle-mounted device cooling mode in which the refrigerant is absorbed by the vehicle-mounted device heat exchanger as the operation mode. The vehicle air conditioner described.