JP7059971B2 - Battery cooling system - Google Patents

Description

The present invention relates to a battery cooling system that cools a battery using a refrigerant of an air conditioning system.

Conventionally, as a battery cooling system of this type, a system that cools a battery by using a refrigerant of an air conditioning system has been proposed (see, for example, Patent Document 1). The air conditioning system is composed of a refrigeration cycle in which a compressor, a water cooling condenser, a first expansion valve, a condenser, a second expansion valve and an evaporator are connected in this order via piping. The air conditioning system further bypasses the first operation switching valve provided in the piping between the condenser and the second expansion valve, and the refrigerant passing through the condenser bypasses the first operation switching valve, the second expansion valve, and the evaporator. It is provided with a bypass pipe connected so as to be introduced into the compressor, and a second operation switching valve provided in the bypass pipe. During the cooling operation, the air conditioning system operates the compressor with the first operation switching valve open and the second operation switching valve closed. As a result, the air output from the air outlet by the evaporator is made cold. Further, in the air conditioning system, during the heating operation, the compressor is operated with the first operation switching valve closed and the second operation switching valve open, thereby cooling the high-temperature and high-pressure refrigerant vapor discharged from the compressor with water. It is passed through the compressor and the cooling water is circulated between the water-cooled condenser and the heater core. As a result, the heater core is heated by heat exchange between the refrigerant steam and the circulating cooling water, and the air output from the air outlet by the heater core is made into warm air. The battery cooling system includes a third operation switching valve, an electronic expansion valve, and a radiator, which are sequentially provided in a pipe connected so as to branch from the pipe on the downstream side of the capacitor and join the pipe on the upstream side of the compressor. The battery cooling system operates the compressor with the third operation switching valve open. As a result, the battery is cooled by exchanging heat with the radiator.

Japanese Unexamined Patent Publication No. 2018-151117

By the way, in the battery cooling system, a pressure sensor may be provided on the downstream side of the radiator in order to appropriately cool the battery. In this case, if an abnormality occurs in the pressure sensor, the battery may overheat due to insufficient cooling, so it is necessary to detect the presence or absence of an abnormality in the pressure sensor. It is conceivable to duplicate the pressure sensor when detecting the presence or absence of an abnormality, but the battery cooling system becomes complicated and the cost increases.

The main object of the battery cooling system of the present invention is to enable appropriate detection of the presence or absence of an abnormality in a pressure sensor without duplicating the pressure sensor.

The battery cooling system of the present invention has adopted the following means in order to achieve the above-mentioned main object.

The battery cooling system of the present invention is
A compressor, a heat exchanger for heating, an expansion valve for heating, a condenser, an expansion valve for cooling, a heat exchanger for cooling, and a circulation path of the refrigerant are provided in the compressor, the heat exchanger for heating, the expansion valve for heating, and the condenser. A heating on-off valve that switches to a heating path including the above, and a cooling switch that switches the refrigerant circulation path to a cooling path that includes the compressor, the capacitor, the cooling expansion valve, and the cooling heat exchanger. A battery cooling system that cools a battery using a refrigerant of an air conditioning system including a refrigeration cycle having a valve and an air conditioning side pressure sensor provided in a flow path on the downstream side of the heating heat exchanger.
A battery cooling expansion valve and a battery cooling heat exchanger provided in a battery cooling flow path that branches from the downstream side of the capacitor and joins the upstream side of the compressor.
A battery cooling on-off valve that switches the refrigerant circulation path to a path including the compressor, the capacitor, the battery cooling expansion valve, and the battery cooling heat exchanger.
A battery cooling side pressure sensor provided in a flow path on the downstream side of the battery cooling heat exchanger, and a battery cooling side pressure sensor.
When an abnormality diagnosis of the battery cooling side pressure sensor is requested, the drive of the compressor is stopped and all the valves provided on the path from the battery cooling side pressure sensor to the air conditioning side pressure sensor are opened. An abnormality determining means for determining the presence or absence of an abnormality in the battery cooling side pressure sensor by comparing the pressure detected by the battery cooling side pressure sensor with the pressure detected by the air conditioning side pressure sensor.
The gist is to prepare.

The battery cooling system of the present invention cools the battery by using the refrigerant of the air conditioning system. The air conditioning system includes a compressor, a heat exchanger for heating, an expansion valve for heating, a condenser, an expansion valve for cooling and a heat exchanger for cooling, and a compressor, a heat exchanger for heating, an expansion valve for heating and a condenser for the circulation path of the refrigerant. A heating on-off valve that switches to a heating path including and a cooling on-off valve that switches the refrigerant circulation path to a cooling path that includes a compressor, a capacitor, a cooling expansion valve, and a cooling heat exchanger. It has a refrigeration cycle. Further, the air conditioning system includes an air conditioning side pressure sensor provided in a flow path on the downstream side of the heating heat exchanger. The battery cooling system consists of a battery cooling expansion valve and a battery cooling heat exchanger provided in the battery cooling flow path that branches from the downstream side of the condenser and joins the upstream side of the compressor, and the compressor and the condenser in the circulation path of the refrigerant. And an on-off valve for battery cooling that switches to a path including an expansion valve for cooling the battery and a heat exchanger for cooling the battery. Further, the battery cooling system includes a battery cooling side pressure sensor provided in a flow path on the downstream side of the battery cooling heat exchanger. Then, when an abnormality diagnosis of the battery cooling side pressure sensor is requested, the drive of the compressor is stopped and all the valves provided on the path from the battery cooling side pressure sensor to the air conditioning side pressure sensor are opened to open the battery. By comparing the pressure detected by the cooling side pressure sensor with the pressure detected by the air conditioning side pressure sensor, it is determined whether or not there is an abnormality in the battery cooling side pressure sensor. As a result, since the battery cooling system uses the pressure sensor on the air conditioning side of the air conditioning system, it is possible to appropriately detect the presence or absence of an abnormality in the pressure sensor on the battery cooling side without duplicating the pressure sensor on the battery cooling side.

In such a battery cooling system of the present invention, in the refrigerating cycle, the compressor, the heat exchanger for heating, the expansion valve for heating, the condenser, and the opening / closing for cooling are sequentially provided in the circulation flow path filled with the refrigerant. Bypassing the valve, the cooling expansion valve, the cooling heat exchanger, the cooling on-off valve, the cooling expansion valve, and the cooling evaporator, the refrigerant that has passed through the capacitor is placed on the upstream side of the compressor. The bypass flow path for flowing in may be provided with the heating on-off valve provided in the bypass flow path.

It is a block diagram which shows the outline of the structure of the battery cooling system 50 as an Example of this invention. It is explanatory drawing which shows the flow of the refrigerant at the time of a cooling operation. It is explanatory drawing which shows the flow of the refrigerant at the time of a heating operation. It is explanatory drawing which shows the flow of the refrigerant at the time of a dehumidifying heating operation. It is explanatory drawing which shows the flow of the refrigerant at the time of battery cooling. It is a flowchart which shows an example of the pressure sensor abnormality diagnosis processing executed by a control device 60.

Next, an embodiment for carrying out the present invention will be described with reference to examples.

FIG. 1 is a configuration diagram showing an outline of the configuration of the battery cooling system 50 as an embodiment of the present invention. The battery cooling system 50 of the embodiment cools the battery 1 mounted on an electric vehicle such as an electric vehicle or a hybrid vehicle by using the refrigerant of the air conditioning system 10. Here, for convenience of explanation, first, the configuration of the air conditioning system 10 will be described, and then the configuration of the battery cooling system 50 of the embodiment will be described.

The air conditioning system 10 includes a housing 12, a blower 14, a cooling evaporator 16, and a heater core 18. The housing 12 is provided with an air outlet in the vehicle interior, and an air passage 11 is formed inside the housing 12. The blower 14 takes in air (inside air or outside air) and blows it to the air passage 11. The cooling evaporator 16 is configured as a cooling heat exchanger and is provided on the downstream side of the blower 14 of the air passage 11. The heater core 18 is provided on the downstream side of the cooling evaporator 16 of the air passage 11. The heater core 18 is connected to a water-cooled condenser 22 as a heat exchanger for heating, an engine, a heater, and the like via a circulation pipe 19, and receives a supply of cooling water heated by the water-cooled condenser 22, an engine, and a heater. To dissipate heat. Further, although not shown, the air passage 11 is provided with a bypass path that bypasses the heater core 18, an air mix door for switching between heating and cooling, and the like. Further, the cooling evaporator 16 is provided with a temperature sensor 16a for detecting the temperature (evaporator temperature Tevo).

Further, the air conditioning system 10 includes a refrigerating cycle 20 including a cooling evaporator 16 as a cooling heat exchanger and a water cooling condenser 22 as a heating heat exchanger. In the refrigeration cycle 20, a compressor 21, a water cooling condenser 22, a heating expansion valve 23, a condenser 24, a cooling expansion valve 25, a cooling evaporator 16, and an accumulator 27 are connected in this order via pipes 31, 32, 33 in an annular shape. It is a thing.

As described above, the water-cooled condenser 22 is configured as a heat exchanger for heating, and heats the cooling water supplied to the heater core 18 by heat exchange with the high-temperature and high-pressure refrigerant steam discharged by the compressor 21. In the pipe 31 between the water-cooled condenser 22 and the heating expansion valve 23, a pressure sensor 45 that detects the pressure of the refrigerant that has passed through the water-cooled condenser 22 (water-cooled condenser outlet pressure Pa) and the refrigerant that has passed through the water-cooled condenser 22 A temperature sensor 46 for detecting the temperature (water-cooled condenser outlet temperature) is provided.

The capacitor 24 cools a high-temperature and high-pressure refrigerant into a supercooled state (gas-liquid mixed state). The condenser 24 is arranged outside the vehicle interior and cools the refrigerant by heat exchange with the traveling wind and the blown air of the condenser fan 24a.

A pipe (hereinafter referred to as a cooling pipe) 33 connected to the inlet of the accumulator 27 is connected to the pipe 32 connected to the outlet of the condenser 24. The cooling pipe 33 is provided with a cooling on-off valve 41 configured as a solenoid valve, a cooling expansion valve 25, and a cooling evaporator 16 in this order from the upstream side. A temperature sensor 47 for detecting the temperature of the refrigerant passing through the cooling evaporator 16 (cooling evaporator outlet temperature) is provided on the downstream side of the cooling evaporator 16 of the cooling pipe 33.

Further, a bypass pipe 34 is connected between the outlet of the condenser 24 of the pipe 32 and the on-off valve 41 for cooling, and the inlet of the accumulator 27. The bypass pipe 34 bypasses the cooling on-off valve 41, the cooling expansion valve 25, and the cooling evaporator 16 and allows the refrigerant from the condenser 24 to flow into the accumulator 27. The bypass pipe 34 is provided with a bypass on-off valve 42 configured as a solenoid valve.

Further, a bypass pipe 35 is connected between the outlet of the water cooling condenser 22 of the pipe 31 and the expansion valve 23 for heating, and between the connection point of the bypass pipe 34 of the pipe 32 and the on-off valve 41 for cooling. ing. The bypass pipe 35 is provided with a bypass on-off valve 43 configured as a solenoid valve.

The battery cooling system 50 of the embodiment includes a battery cooling pipe 51 connected in parallel with the cooling pipe 33 to the outlet side of the condenser 24 and the inlet side of the accumulator 27. In this embodiment, the battery cooling pipe 51 has two parallel pipes 51a and 51b that branch on the upstream side and join on the downstream side. The parallel pipes 51a and 51b are provided with battery cooling expansion valves 52a and 52b and battery cooling evaporators 53a and 53b as battery cooling heat exchangers in this order from the upstream side, respectively. In this embodiment, the battery 1 has two battery packs arranged at different locations in the vehicle, and the battery cooling evaporators 53a and 53b are arranged so as to be heat exchangeable with the respective battery packs. Temperature sensors 54a and 54b that detect the temperature of the refrigerant flowing into the battery cooling evaporators 53a and 53b (battery cooling evaporator inlet temperature) near the inlets of the battery cooling evaporators 53a and 53b of the parallel pipes 51a and 51b, respectively. Is provided. Further, near the outlets of the battery cooling evaporators 53a and 53b of the parallel pipes 51a and 51b, a temperature sensor 55a that detects the temperature of the refrigerant flowing out from the battery cooling evaporators 53a and 53b (battery cooling evaporator outlet temperature), respectively. , 55b are provided. Further, a pressure sensor 56 for detecting the pressure of the refrigerant flowing out from the battery cooling evaporators 53a and 53b (battery cooling evaporator outlet pressure Pb) is provided at the confluence portion where the parallel pipes 51a and 51b meet.

The control device 60 controls the air conditioning system 10 and the battery cooling system 50. Although not shown, the control device 60 is configured as a microprocessor centered on a CPU, and includes a ROM for storing a processing program, a RAM for temporarily storing data, an input / output port, and the like, in addition to the CPU.

Signals from various sensors necessary for controlling the air conditioning system 10 are input to the control device 60 via the input port. Examples of the signal input to the control device 60 include a signal from the pressure sensor 45 and a signal from the temperature sensors 16a, 46, 47. On the other hand, a signal necessary for controlling the air conditioning system 10 is output from the control device 60 via the output port. The signals output from the control device 60 include, for example, a control signal to the blower motor 14a, a control signal to the compressor 21, a control signal to the heating expansion valve 23, a control signal to the condenser fan 24a, and a cooling expansion valve 25. A control signal to, an on / off signal to the cooling on-off valve 41, an on / off signal to the bypass on-off valves 42, 43, and the like can be mentioned.

Further, signals from various sensors necessary for controlling the battery cooling system 50 are input to the control device 60 via the input port. Examples of the signal input to the control device 60 include a signal from the pressure sensor 56 and a signal from the temperature sensors 54a, 54b, 55a, 55b. On the other hand, a signal necessary for controlling the battery cooling system 50 is output from the control device 60 via the output port. Examples of the signal output from the control device 60 include a control signal for the battery cooling expansion valves 52a and 52b, an on / off signal for the battery cooling on-off valve 57, and the like.

Next, the operation of the air conditioning system 10 and the operation of the battery cooling system 50 configured in this way will be described. First, the operation of the air conditioning system 10 will be described. In this embodiment, the air conditioning system 10 has a cooling operation, a heating operation, and a dehumidifying heating operation as operation modes. FIG. 2 is an explanatory diagram showing the flow of the refrigerant in the cooling operation mode, FIG. 3 is an explanatory diagram showing the flow of the refrigerant in the heating operation, and FIG. 4 is an explanatory diagram showing the flow of the refrigerant in the dehumidifying and heating operation. It is explanatory drawing which shows.

In the cooling operation, as shown in FIG. 2, the bypass on-off valves 42 and 43 are closed, the heating expansion valve 23 and the cooling on-off valve 41 are opened, and the compressor 21 is driven and cooled in this state. This is done by adjusting the opening degree of the expansion valve 25. The high-temperature and high-pressure refrigerant steam discharged from the compressor 21 passes through the water-cooled condenser 22, the heating expansion valve 23, and the condenser 24 in this order, is cooled by the condenser 24, and reaches a supercooled state (gas-liquid mixed state). Then, the refrigerant that has passed through the condenser 24 is depressurized by the cooling expansion valve 25 and then vaporized by the cooling evaporator 16. The air conditioning system 10 drives the blower motor 14a to blow air from the blower 14 to the air passage 11, and cools the air blown to the air passage 11 by the latent heat accompanying the vaporization of the refrigerant in the cooling evaporator 16. It can be blown into the room. The refrigerant that has passed through the cooling evaporator 16 is sent to the accumulator 27 and is separated into a gas component and a liquid component in the accumulator 27. The compressor 21 pressurizes the low-pressure refrigerant vapor, which is a gas component of the refrigerant, and discharges it as high-temperature and high-pressure refrigerant vapor. In the air conditioning system 10, during the cooling operation, the passenger interior is based on the pressure of the refrigerant that has passed through the cooling evaporator 16 (cooling side evaporator outlet pressure) and the temperature of the refrigerant that has passed through the cooling evaporator 16 (cooling side evaporator outlet temperature). The target rotation speed of the compressor 21 and the target opening degree of the cooling expansion valve 25 are set so that the temperature of the air conditioner 21 approaches the set temperature. Then, the compressor 21 is controlled so as to rotate at the set target rotation speed, and the cooling expansion valve 25 is controlled so as to open the valve at the target opening degree. Here, the cooling evaporator outlet pressure is for battery cooling because the downstream side of the cooling evaporator 26 of the cooling pipe 33 and the downstream side of the battery cooling evaporators 53a and 53b of the battery cooling pipe 51 communicate with each other. It can be detected by the pressure sensor 56 provided on the downstream side of the evaporators 53a and 53b. Further, the temperature at the outlet of the cooling evaporator can be detected by the temperature sensor 47.

In the heating operation, as shown in FIG. 3, the cooling on-off valve 41 and the bypass on-off valve 43 are closed and the bypass on-off valve 42 is opened, and in this state, the compressor 21 is driven and the heating is expanded. This is done by adjusting the opening degree of the valve 23 and circulating cooling water between the water cooling condenser 22 and the heater core 18. The high-temperature and high-pressure refrigerant steam discharged from the compressor 21 passes through the water-cooled condenser 22 and exchanges heat with the cooling water circulating between the water-cooled condenser 22 and the heater core 18. As a result, the air conditioning system 10 can blow air blown from the blower 14 to the air passage 11 to heat the air blown to the air passage 11 with the cooling water passing through the heater core 18 and blow it out into the vehicle interior. The refrigerant cooled by heat exchange with the cooling water in the water-cooled condenser 22 is depressurized by the heating expansion valve 23, vaporized by the condenser 24, sent to the accumulator 27, and discharged from the compressor 21 again. In the air conditioning system 10, during the heating operation, the target rotation speed of the compressor 21 and the target opening degree of the expansion valve 23 for heating are set so that the temperature inside the vehicle approaches the set temperature based on the outlet pressure of the water-cooled condenser and the outlet temperature of the water-cooled condenser. To set. Then, the compressor 21 is controlled so as to rotate at the set target rotation speed, and the heating expansion valve 23 is controlled so as to open the valve at the target opening degree. Here, the outlet pressure of the water-cooled condenser can be detected by the pressure sensor 45, and the outlet temperature of the water-cooled condenser can be detected by the temperature sensor 46.

In the dehumidifying and heating operation, as shown in FIG. 4, in addition to the refrigerant path during the heating operation, the bypass on-off valve 43 and the cooling on-off valve 41 are opened, and a part of the refrigerant that has passed through the water cooling condenser 22. Is performed by forming a path for supplying the cooling evaporator 16 via the cooling expansion valve 25. During the dehumidifying and heating operation, the air conditioning system 10 introduces a part of the refrigerant that has passed through the water cooling condenser 22 and supplies it to the cooling evaporator 16 while reducing the pressure with the cooling expansion valve 25, so that a part of the refrigerant is used for cooling. It is vaporized by the evaporator 16. As a result, the air conditioning system 10 can perform the heating operation while dehumidifying by condensing the moisture in the air blown from the blower 14 by the cooling evaporator 16.

Next, the operation of the battery cooling system 50 will be described. FIG. 5 is an explanatory diagram showing the flow of the refrigerant when the battery is cooled. In the battery cooling operation, as shown in FIG. 5, the bypass on-off valves 42 and 43 are closed, the heating expansion valve 23 and the battery cooling on-off valve 57 are opened, and the compressor 21 is driven in this state. At the same time, the opening degree of the battery cooling expansion valves 52a and 52b is adjusted. The high-temperature and high-pressure refrigerant steam discharged from the compressor 21 passes through the water-cooled condenser 22, the heating expansion valve 23, and the condenser 24 in this order, and is cooled in the condenser 24. The refrigerant that has passed through the condenser 24 is decompressed by the battery cooling expansion valves 52a and 52b, and then vaporized by the battery cooling evaporators 53a and 53b. As a result, the battery cooling system 50 can cool the battery 1 by the latent heat accompanying the vaporization of the refrigerant in the battery cooling evaporators 53a and 53b. The refrigerant that has passed through the cooling evaporator 16 is sent to the accumulator 27 and discharged again by the compressor 21. In the battery cooling system 50, when the battery is cooled, the compressor 21 is set so that the temperature of the battery 1 is within an appropriate temperature range based on the battery cooling evaporator outlet pressure Pb, the battery cooling evaporator inlet temperature, and the battery cooling evaporator outlet temperature. The target rotation speed and the target opening degree of the battery cooling expansion valves 52a and 52b are set. Then, the compressor 21 is controlled so as to rotate at the set target rotation speed, and the battery cooling expansion valves 52a and 52b are controlled so as to open the valve at the target opening degree. Here, the battery cooling evaporator outlet pressure Pb can be detected by the pressure sensor 56. Further, the battery cooling evaporator inlet temperature can be detected by the temperature sensors 54a and 54b. Further, the battery cooling evaporator outlet temperature can be detected by the temperature sensors 55a and 55b. As shown in FIG. 1, the battery cooling pipe 51 and the cooling pipe 33 are connected in parallel to the outlet of the condenser 24 and the inlet of the accumulator 27, and the battery cooling on-off valve 57 and the cooling pipe 33 are connected in parallel. Since it is turned on and off independently of the on-off valve 41, the battery cooling system 50 is the battery cooling on-off valve 57 while the cooling on-off valve 41 is opened in the air conditioning system 10 and the cooling operation is being executed. Can also be opened to cool the battery 1.

Next, the operation of diagnosing the presence or absence of abnormality of the pressure sensor 56 included in the battery cooling system 50 of the embodiment will be described. FIG. 6 is a flowchart showing an example of the pressure sensor abnormality diagnosis process executed by the control device 60. This process is repeatedly executed every predetermined time (for example, every several msec). When the pressure sensor abnormality diagnosis process is executed, the control device 60 first determines whether or not the execution condition of the abnormality diagnosis is satisfied (step S100). Here, in the embodiment, the abnormality diagnosis is executed once in one trip (the period from the ignition on to the ignition off of the vehicle). Therefore, when the abnormality diagnosis is not executed during one trip, it is determined that the execution condition is satisfied, and when the abnormality diagnosis is executed during one trip, it is determined that the execution condition is not satisfied. If it is determined that the execution condition of the abnormality diagnosis is not satisfied, the pressure sensor abnormality diagnosis process is terminated. On the other hand, if it is determined that the execution condition of the abnormality diagnosis is satisfied, it is determined whether or not the air conditioning system 10 is in the cooling operation (step S110). If it is determined that the cooling operation is not in progress, the process proceeds to step S140. On the other hand, if it is determined that the cooling operation is in progress, the evaporator temperature Tevo from the temperature sensor 16a is input (step S120), and it is determined whether or not the input evaporator temperature Tevo is less than the threshold value Tref (step S130). Here, even if the threshold value Tref temporarily stops the supply of the refrigerant to the cooling evaporator 16 during the cooling operation, the air blown from the blower 14 into the vehicle interior through the cooling evaporator 16 causes discomfort to the occupants. It is a threshold value for determining whether the cooling evaporator 16 is cooled to the extent that it is not given. The threshold value Tref can be set based on, for example, the set temperature of the air conditioner. If it is determined that the evaporator temperature Tevo is not less than the threshold value Tref, it is determined that there is a risk of causing discomfort to the occupant by executing the abnormality diagnosis described later, and the pressure sensor abnormality diagnosis process is terminated. On the other hand, if it is determined that the evaporator temperature Tevo is less than the threshold value Tref, the process proceeds to step S140.

Next, the drive of the compressor 21 is stopped (step S140). Subsequently, all the valves of the air conditioning system 10 and the battery cooling system 50, that is, the expansion valve 23 for heating, the expansion valve 25 for cooling, the on-off valve 41 for cooling, the on-off valves 42 and 43 for bypass, the on-off valve 57 for battery cooling, and the like. The battery cooling expansion valves 52a and 52b are opened (step S150), and a predetermined time elapses (step S160). As a result, the battery cooling pipe 51 provided with the pressure sensor 56 and the pipe 31 provided with the pressure sensor 45 can be communicated with each other to make the pressures of both uniform. The predetermined time is a waiting time required for pressure equalization, and an experimentally determined time is used. After a lapse of a predetermined time, the water-cooled condenser outlet pressure Pa from the pressure sensor 56 and the battery cooling evaporator outlet pressure Pb from the pressure sensor 45 are input (step S170), and both pressures are compared (step S180). When it is determined that both pressures are substantially the same, it is determined that both the pressure sensors 45 and 56 are normal, and the pressure sensor abnormality diagnosis process is terminated. On the other hand, if it is determined that the two pressures do not substantially match, it is determined that an abnormality has occurred in one of the pressure sensors 45 and 56 (step S190), and the pressure sensor abnormality diagnosis process is terminated. In the embodiment, when it is determined that an abnormality has occurred in the pressure sensors 45 and 56, the operation of the air conditioning system 10 and the battery cooling system 50 is stopped.

In the battery cooling system 50 of the present embodiment described above, the battery 1 is cooled by using the refrigerant of the air conditioning system 10 including the refrigerating cycle 20 and the pressure sensor 45 provided downstream of the water cooling condenser 22 thereof. In the battery cooling system 50, when an abnormality diagnosis of the pressure sensor 56 provided downstream of the battery cooling evaporators 53a and 53b is requested, the operation of the compressor 21 is stopped and the air conditioning system 10 and the battery cooling system 50 are provided. Open all valves. Then, the pressure detected by the pressure sensor 56 (battery cooling evaporator outlet pressure Pb) is compared with the pressure detected by the pressure sensor 45 (water-cooled condenser outlet pressure Pa) to determine the presence or absence of abnormalities in the pressure sensors 45 and 56. judge. As a result, the presence or absence of the abnormality can be appropriately detected without duplicating the pressure sensor 56 (battery cooling side pressure sensor).

In the embodiment, when the abnormality diagnosis of the pressure sensors 45 and 56 is performed, all the valves included in the air conditioning system 10 and the battery cooling system 50 are opened. However, since it is sufficient that the battery cooling pipe 51 provided with the pressure sensor 56 (battery cooling side pressure sensor) and the pipe 31 provided with the pressure sensor 45 (air conditioning side pressure sensor) can communicate with each other, it is sufficient to communicate with each other on the path of both pipes. Only the valve provided may be opened and the other valves may be closed. For example, only the heating expansion valve 23, the battery cooling on-off valve 57, and the battery cooling expansion valves 52a and 52b may be opened. Alternatively, only the bypass on-off valve 43, the cooling on-off valve 41, and the cooling expansion valve 25 may be opened.

In the embodiment, the air conditioning system 10 has a dehumidifying and heating operation as an operation mode. However, the air conditioning system 10 may not have a dehumidifying / heating operation. In this case, the bypass pipe 35 and the bypass on-off valve 43 may be omitted.

The correspondence between the main elements of the embodiment and the main elements of the invention described in the column of means for solving the problem will be described. In the embodiment, the compressor 21 corresponds to the "compressor", the water-cooled condenser 22 corresponds to the "heat exchanger for heating", the expansion valve 23 for heating corresponds to the "expansion valve for heating", and the condenser 24 corresponds to the "condenser". The cooling expansion valve 25 corresponds to the "cooling expansion valve", the cooling evaporator 16 corresponds to the "cooling heat exchanger", and the cooling on-off valve 41 corresponds to the "cooling on-off valve". The bypass on-off valve 42 corresponds to the "heating on-off valve", the pressure sensor 45 corresponds to the "air conditioning side pressure sensor", and the battery cooling pipe 51 corresponds to the "battery cooling flow path". The expansion valves 52a and 52b for cooling the battery correspond to the "expansion valve for cooling the battery", the evaporators 53a and 53b for cooling the battery correspond to the "heat exchanger for cooling the battery", and the on-off valve 57 for cooling the battery corresponds to the "battery cooling". The pressure sensor 56 corresponds to the "battery cooling side pressure sensor", and the control device 60 that executes the pressure sensor abnormality diagnosis process corresponds to the "abnormality determination means".

As for the correspondence between the main elements of the examples and the main elements of the invention described in the column of means for solving the problem, the invention described in the column of means for solving the problems of the examples is carried out. Since it is an example for specifically explaining the form for solving the problem, the elements of the invention described in the column of means for solving the problem are not limited. That is, the interpretation of the invention described in the column of means for solving the problem should be performed based on the description in the column, and the examples are the inventions described in the column of means for solving the problem. It is just a concrete example.

Although the embodiments for carrying out the present invention have been described above with reference to the embodiments, the present invention is not limited to these examples, and the present invention is not limited to these embodiments, and various embodiments are used without departing from the gist of the present invention. Of course it can be done.

The present invention is available in the battery cooling system manufacturing industry.

10 air conditioning system, 11 air passage, 12 housing, 14 blower, 14a blower fan, 16 cooling evaporator, 16a temperature sensor, 18 heater core, 19 circulation piping, 20 refrigeration cycle, 21 compressor, 22 water cooling condenser, 23 expansion valve for heating. , 24 condenser, 25 cooling expansion valve, 27 accumulator, 31, 32 piping, 33 piping (cooling piping), 34, 35 bypass piping, 41 cooling on-off valve, 42, 43 bypass on-off valve, 45 pressure sensor, 46, 47 temperature sensor, 50 battery cooling system, 51 battery cooling pipe, 51a, 51b pipe 5, 52a, 52b battery cooling expansion valve, 53a, 53b battery cooling evaporator, 54a, 54b, 55a, 55b temperature sensor, 56 pressure sensor, 57 battery cooling on-off valve, 60 control device.

Claims (1)

A compressor, a heat exchanger for heating, an expansion valve for heating, a condenser, an expansion valve for cooling, a heat exchanger for cooling, and a circulation path of the refrigerant are provided in the compressor, the heat exchanger for heating, the expansion valve for heating, and the condenser. A heating on-off valve that switches to a heating path including the above, and a cooling switch that switches the refrigerant circulation path to a cooling path that includes the compressor, the capacitor, the cooling expansion valve, and the cooling heat exchanger. A battery cooling system that cools a battery using a refrigerant of an air conditioning system including a refrigeration cycle having a valve and an air conditioning side pressure sensor provided in a flow path on the downstream side of the heating heat exchanger.
A battery cooling expansion valve and a battery cooling heat exchanger provided in a battery cooling flow path that branches from the downstream side of the capacitor and joins the upstream side of the compressor.
A battery cooling on-off valve that switches the refrigerant circulation path to a path including the compressor, the capacitor, the battery cooling expansion valve, and the battery cooling heat exchanger.
A battery cooling side pressure sensor provided in a flow path on the downstream side of the battery cooling heat exchanger, and a battery cooling side pressure sensor.
When an abnormality diagnosis of the battery cooling side pressure sensor is requested, the drive of the compressor is stopped and all the valves provided on the path from the battery cooling side pressure sensor to the air conditioning side pressure sensor are opened. An abnormality determining means for determining the presence or absence of an abnormality in the battery cooling side pressure sensor by comparing the pressure detected by the battery cooling side pressure sensor with the pressure detected by the air conditioning side pressure sensor.
Battery cooling system with.

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