Vehicular temperature control system

Abstract

To improve a COP in a vehicular temperature control system having refrigeration cycles of a plurality of systems.SOLUTION: A vehicular temperature control system 100 includes: a first refrigeration cycle 10; a second refrigeration cycle 20; and a blower 34 that blows air to a first low pressure side heat exchanger 14 in the first refrigeration cycle 10 and a second low pressure side heat exchanger 24 in the second refrigeration cycle 20 to guide the air into a cabin. The second low pressure side heat exchanger 24 is disposed upstream of the first low pressure side heat exchanger 14 in a flowing direction AD of the air guided by the blower 34. When the vehicular temperature control system 100 performs a cooling operation, air cooled by a second refrigerant R2 in the second low pressure side heat exchanger 24 is further cooled by a first refrigerant R1 in the first low pressure side heat exchanger 14.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present disclosure relates to a temperature control system for a vehicle. [Background technology]

[0002] There is an example of a cooling system equipped with two refrigeration cycles to perform air conditioning of the vehicle cabin and temperature management of the battery (Patent Document 1). The cooling system described in Patent Document 1 is equipped with a first refrigerant circuit including an electric compressor, an air-cooled condenser, an evaporator for the vehicle cabin, and an auxiliary chiller for the battery, and a second refrigerant circuit including an engine-driven compressor, an air-cooled condenser, and a main chiller for the battery. The main chiller of the second refrigerant circuit cools the coolant supplied to the battery while the engine is running. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] U.S. Pat. No. 1,063,9957 Summary of the Invention [Problem to be solved by the invention]

[0004] Even if a system has two refrigeration cycles, one for air conditioning and the other for the battery, there are cases where only the refrigeration cycle for air conditioning is operated, for example, under conditions where temperature management of the battery is not required. In the system described in Patent Document 1, an air-cooled condenser is used for each of the two refrigeration cycles, and when the refrigeration cycle for the battery is stopped, the condenser of the refrigeration cycle for the battery does not exchange heat between the refrigerant and the outside air, so the heat transfer area to the air is reduced. Therefore, it is difficult to improve the COP (Coefficient of Performance) of the refrigeration cycle for air conditioning when the refrigeration cycle for the battery is stopped.

[0005] The present disclosure has been made in consideration of the above circumstances, and has an object to improve the COP in a vehicle temperature adjustment system equipped with multiple refrigeration cycles. [Means for solving the problem]

[0006] In order to solve the above problems, the vehicle temperature control system of the present disclosure employs the following measures. A vehicle temperature control system according to one aspect of the present disclosure includes a first refrigeration cycle including a first compressor, a first high-pressure side heat exchanger to which a first refrigerant compressed by the first compressor is supplied, a first expansion valve to expand the first refrigerant supplied from the first high-pressure side heat exchanger, and a first low-pressure side heat exchanger to which the first refrigerant expanded by the first expansion valve is supplied and which guides the first refrigerant to the first compressor; a second compressor, a second high-pressure side heat exchanger to which a second refrigerant compressed by the second compressor is supplied, a second expansion valve to expand the second refrigerant supplied from the second high-pressure side heat exchanger, and a second refrigeration cycle having a second low-pressure side heat exchanger to which the second refrigerant expanded by a pressure expansion valve is supplied and which guides the second refrigerant to the second compressor, and a blower that blows air into the first low-pressure side heat exchanger and the second low-pressure side heat exchanger and guides the air into the vehicle cabin, wherein the second low-pressure side heat exchanger is disposed upstream of the first low-pressure side heat exchanger in a flow direction of the air guided by the blower, and when the vehicle temperature control system performs a cooling operation, the air cooled by the second refrigerant in the second low-pressure side heat exchanger is further cooled by the first refrigerant in the first low-pressure side heat exchanger. Effect of the Invention

[0007] According to the present disclosure, it is possible to improve the COP in a vehicle temperature adjustment system equipped with multiple refrigeration cycles. [Brief description of the drawings]

[0008] [Figure 1] 1 is a schematic configuration diagram showing a vehicle temperature control system according to a first embodiment of the present disclosure, illustrating a state in which the vehicle temperature control system is performing cooling operation. [Diagram 2] 1 is a schematic configuration diagram showing a vehicle temperature control system according to a first embodiment of the present disclosure, illustrating a state in which the vehicle temperature control system is performing heating operation. [Diagram 3] FIG. 11 is a schematic configuration diagram showing a vehicle temperature control system according to a second embodiment of the present disclosure, illustrating a state in which the vehicle temperature control system is performing cooling operation. [Figure 4] FIG. 11 is a schematic configuration diagram showing a vehicle temperature control system according to a second embodiment of the present disclosure, illustrating a state in which the vehicle temperature control system is performing heating operation. [Diagram 5] FIG. 11 is a schematic configuration diagram showing a vehicle temperature control system according to a third embodiment of the present disclosure, illustrating a state in which the vehicle temperature control system is performing cooling operation. [Figure 6] FIG. 11 is a schematic configuration diagram showing a vehicle temperature control system according to a third embodiment of the present disclosure, illustrating a state in which the vehicle temperature control system is performing heating operation. [Figure 7] FIG. 13 is a schematic configuration diagram showing a vehicle temperature control system according to a fourth embodiment of the present disclosure, illustrating a state in which the vehicle temperature control system is performing cooling operation. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] [First embodiment] A vehicle temperature control system 100 according to a first embodiment of the present disclosure will be described with reference to the drawings. The vehicle temperature control system 100 of this embodiment is installed in a vehicle (not shown), such as an electric vehicle that does not have an engine and obtains driving force for running the vehicle from an electric motor for running, or a so-called hybrid vehicle that obtains driving force for running the vehicle from an engine and an electric motor.

[0010] The vehicle temperature control system 100 is responsible for air conditioning such as heating and cooling, dehumidification, and ventilation of the passenger compartment, as well as thermal management and waste heat recovery of on-board devices such as the battery 4, the driving motor 5, and heat-generating electronic devices mounted on the vehicle. Air conditioning to an appropriate temperature and humidity and managing the on-board devices to an appropriate temperature are collectively referred to as "thermal management." Electricity stored in the on-board battery 4 is supplied to the vehicle temperature control system 100 and the electrically-powered devices and electronic devices provided in the on-board devices.

[0011] 1 is a schematic diagram showing a vehicle temperature control system 100 according to a first embodiment of the present disclosure, and shows a state in which the vehicle temperature control system 100 is performing cooling operation. As shown in Fig. 1, the vehicle temperature control system 100 includes a first refrigeration cycle 10, a second refrigeration cycle 20, an HVAC unit 30, a battery heat exchanger 40, a motor heat exchanger 50, an exterior heat exchange unit 60, pumps 71, 72, and 73, switching valves 81, 82, 83, 84, and 85, and a control unit 90.

[0012] The first refrigeration cycle 10 has a first compressor 11, a first high-pressure side heat exchanger 12, a first expansion valve 13, a first low-pressure side heat exchanger 14, a refrigerant flow path 15, an expansion valve 16, and a low-pressure side heat exchanger 17. The first refrigeration cycle 10 is connected by the refrigerant flow path 15, and circulates a first refrigerant R1 between the first compressor 11, the first high-pressure side heat exchanger 12, the first expansion valve 13, and the first low-pressure side heat exchanger 14 when the vehicle temperature control system 100 is in cooling operation.

[0013] The first compressor 11 compresses the first refrigerant R1 guided from the first low-pressure side heat exchanger 14 and discharges it to the first high-pressure side heat exchanger 12. The first high-pressure side heat exchanger 12 is supplied with the first refrigerant R1 compressed by the first compressor 11 and exchanges heat between the high-temperature, high-pressure first refrigerant R1 and the heat exchange medium M3 circulating in the exterior heat exchange unit 60.

[0014] The first expansion valve 13 expands the first refrigerant R1 supplied from the first high-pressure side heat exchanger 12 and supplies it to the first low-pressure side heat exchanger 14. The first low-pressure side heat exchanger 14 is supplied with the first refrigerant R1 expanded by the first expansion valve 13, and exchanges heat between the decompressed first refrigerant R1 and air blown by the blower 34. The first refrigerant R1 that has passed through the first low-pressure side heat exchanger 14 is guided to the first compressor 11.

[0015] The second refrigeration cycle 20 has a second compressor 21, a second high-pressure side heat exchanger 22, a second expansion valve 23, a second low-pressure side heat exchanger 24, a refrigerant flow path 25, an expansion valve 26, and a low-pressure side heat exchanger 27. The second refrigeration cycle 20 is connected by the refrigerant flow path 25, and circulates a second refrigerant R2 between the second compressor 21, the second high-pressure side heat exchanger 22, the second expansion valve 23, and the second low-pressure side heat exchanger 24 when the vehicle temperature control system 100 is in cooling operation.

[0016] The second compressor 21 compresses the second refrigerant R2 guided from the second low-pressure side heat exchanger 24 and discharges it to the second high-pressure side heat exchanger 22. The second high-pressure side heat exchanger 22 is supplied with the second refrigerant R2 compressed by the second compressor 21 and exchanges heat between the high-temperature, high-pressure second refrigerant R2 and the heat exchange medium M3 circulating in the exterior heat exchange unit 60.

[0017] The second expansion valve 23 expands the second refrigerant R2 supplied from the second high-pressure side heat exchanger 22 and supplies it to the second low-pressure side heat exchanger 24. The second low-pressure side heat exchanger 24 is supplied with the second refrigerant R2 expanded by the second expansion valve 23, and exchanges heat between the decompressed second refrigerant R2 and air blown by the blower 34. The second refrigerant R2 that has passed through the second low-pressure side heat exchanger 24 is guided to the second compressor 21.

[0018] The HVAC unit 30 has a first low-pressure side heat exchanger 14, a second low-pressure side heat exchanger 24, an interior heat exchanger 33, a blower 34, and a temperature sensor 35. The second low-pressure side heat exchanger 24 is disposed upstream of the first low-pressure side heat exchanger 14 in the flow direction AD of the air guided by the blower 34. The interior heat exchanger 33 is disposed downstream of the first low-pressure side heat exchanger 14 in the flow direction AD of the air guided by the blower 34.

[0019] When the vehicle temperature adjustment system 100 is in cooling operation, the first refrigerant R1 expanded by the first expansion valve 13 is supplied to the first low-pressure side heat exchanger 14. The first low-pressure side heat exchanger 14 exchanges heat between the air blown by the blower 34 and the first refrigerant R1 to cool the air.

[0020] When the vehicle temperature adjustment system 100 is in cooling operation, the second refrigerant R2 expanded by the second expansion valve 23 is supplied to the second low-pressure side heat exchanger 24. The second low-pressure side heat exchanger 24 exchanges heat between the air blown by the blower 34 and the second refrigerant R2 to cool the air.

[0021] When the vehicle temperature adjustment system 100 performs heating operation, the heating medium HM that has exchanged heat with the first refrigerant R1 in the first high-pressure side heat exchanger 12 is supplied to the interior heat exchanger 33. The interior heat exchanger 33 exchanges heat between the air blown by the blower 34 and the heating medium HM to heat the air.

[0022] The blower 34 is a device that blows air along the flow direction AD to the first low-pressure side heat exchanger 14 and the second low-pressure side heat exchanger 24 and guides the air into the vehicle cabin. The blower 34 blows air, causing it to pass through the first low-pressure side heat exchanger 14, the second low-pressure side heat exchanger 24, and the interior heat exchanger 33, and guides the air into the vehicle cabin.

[0023] The temperature sensor 35 is a device that detects the temperature of the air guided from the blower 34 to the first low-pressure side heat exchanger 14, the second low-pressure side heat exchanger 24, and the interior heat exchanger 33.

[0024] When the vehicle temperature control system 100 is in air-conditioning operation and the battery 4 needs to be cooled, the battery heat exchanger 40 is supplied with a cooling medium CM and exchanges heat with the battery 4 that stores the electric power used in the vehicle. When the vehicle temperature control system 100 is in air-conditioning operation, the battery 4 is cooled by heat exchange with the cooling medium CM.

[0025] When the vehicle temperature regulation system 100 is performing cooling operation or heating operation and cooling of the driving motor 5 or waste heat recovery is required, the motor heat exchanger 50 is supplied with the heat exchange medium M3 and exchanges heat with the driving motor 5. When the vehicle temperature regulation system 100 is performing cooling operation or heating operation, the driving motor 5 is cooled by heat exchange with the heat exchange medium M3.

[0026] The exterior heat exchange unit 60 is a unit that exchanges heat between air (outside air) and a heat exchange medium M3 outside the vehicle, and includes an exterior heat exchanger 61 and a fan 62. The fan 62 blows air toward the exterior heat exchanger 61. The exterior heat exchanger 61 exchanges heat between the heat exchange medium M3 and the air (outside air).

[0027] The control unit 90 is a device that controls the vehicle temperature adjustment system 100. The control unit 90 controls each part of the vehicle temperature adjustment system 100, including the first refrigeration cycle 10, the second refrigeration cycle 20, the pumps 71, 72, 73, and the switching valves 81, 82, 83, 84, 85.

[0028] <Cooling operation> Here, the operation of the vehicle temperature adjustment system 100 during cooling operation will be described with reference to Fig. 1. As shown in Fig. 1, when the vehicle temperature adjustment system 100 performs cooling operation, the control unit 90 controls the first refrigeration cycle 10 so that the first refrigerant R1 circulates through the refrigerant flow path 15. Also, when the vehicle temperature adjustment system 100 performs cooling operation, the control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 circulates through the refrigerant flow path 25.

[0029] In addition, when the vehicle temperature control system 100 is operating in cooling mode, the control unit 90 controls the pump 71, the pump 73, the switching valve 81, the switching valve 82, and the switching valve 83 so as to form a circulation flow path (first circulation flow path) C11 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 73, the switching valve 83, the first high pressure side heat exchanger 12, the pump 71, the switching valve 81, the switching valve 82, and the exterior heat exchanger 61 in that order.

[0030] In addition, when the vehicle temperature control system 100 is operating in cooling mode, the control unit 90 controls the pump 73, the switching valve 82, the switching valve 84, and the switching valve 85 so as to form a circulation flow path (second circulation flow path) C21 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 73, the switching valve 84, the second high-pressure side heat exchanger 22, the switching valve 85, the switching valve 82, and the exterior heat exchanger 61 in that order.

[0031] When the vehicle temperature adjustment system 100 is in cooling operation, the control unit 90 controls the second pressure of the second refrigerant R2 passing through the second expansion valve 23 to be higher than the first pressure of the first refrigerant R1 passing through the first expansion valve 13. In addition, the control unit 90 controls the temperature of the second refrigerant R2 passing through the second low-pressure side heat exchanger 24 to be higher than the temperature of the first refrigerant R1 passing through the first low-pressure side heat exchanger 14.

[0032] During cooling operation, the vehicle temperature adjustment system 100 further cools the air cooled by the second refrigerant R2 in the second low-pressure side heat exchanger 24 with the first refrigerant R1 in the first low-pressure side heat exchanger 14. In this way, the temperature of the air blown from the blower 34 can be gradually reduced as it is blown from the upstream side to the downstream side along the flow direction AD.

[0033] When the vehicle temperature control system 100 is in air-conditioning operation and it is necessary to cool the battery 4, the battery heat exchanger 40 is supplied with the cooling medium CM that has passed through the low-pressure side heat exchanger 27. The low-pressure side heat exchanger 27 is supplied with the second refrigerant R2 expanded by the expansion valve 26, and cools the cooling medium CM with the decompressed second refrigerant R2. The battery heat exchanger 40 cools the battery 4 by exchanging heat between the cooling medium CM and the battery 4.

[0034] When the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is equal to or higher than a first predetermined temperature (e.g., 30°C), the control unit 90 operates the first refrigeration cycle 10 to circulate the first refrigerant R1 through the refrigerant flow path 15, and operates the second refrigeration cycle 20 to circulate the second refrigerant R2 through the refrigerant flow path 25.

[0035] On the other hand, when the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is lower than a first predetermined temperature, the control unit 90 operates the first refrigeration cycle 10 while stopping the second refrigeration cycle 20. When stopping the second refrigeration cycle 20, the control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 does not circulate through the refrigerant flow path 25.

[0036] In addition, the control unit 90 may operate the first refrigeration cycle 10 to circulate the first refrigerant R1 through the refrigerant flow path 15, and operate the second refrigeration cycle 20 to circulate the second refrigerant R2 through the refrigerant flow path 25, when the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is less than a first predetermined temperature (e.g., 30°C) and is equal to or higher than a second predetermined temperature (e.g., 25°C), and the temperature of the battery 4 detected by the temperature sensor 4a is equal to or higher than a third predetermined temperature (e.g., 35°C).

[0037] The vehicle temperature control system 100 of this embodiment has an inside air inlet (not shown) for introducing air inside the vehicle cabin into the HVAC unit 30 and an outside air inlet (not shown) for introducing air outside the vehicle cabin into the HVAC unit 30. The first low-pressure heat exchanger 14 is disposed in a passage including the outside air inlet. When the vehicle temperature control system 100 of this embodiment performs cooling operation, the control unit 90 operates the first refrigeration cycle 10 to supply the first refrigerant R1 to the first low-pressure heat exchanger 14 and operates the second refrigeration cycle 20 to supply the second refrigerant R2 to the second low-pressure heat exchanger 24 when the temperature of the air outside the vehicle cabin guided by the blower 34 to the second low-pressure heat exchanger 24 is equal to or higher than a first predetermined temperature and the state of introducing the air inside the vehicle cabin from the inside air inlet is switched to the state of introducing the air outside the vehicle cabin from the outside air inlet. In this way, it is possible to deal with the sensing delay due to the time constant of the temperature sensor 35.

[0038] <Heating operation> Next, the operation of the vehicle temperature control system 100 during heating operation will be described with reference to Fig. 2. Fig. 2 is a schematic configuration diagram showing the vehicle temperature control system 100 according to the first embodiment of the present disclosure, and shows a state in which the vehicle temperature control system 100 is performing heating operation.

[0039] 2, when the vehicle temperature adjustment system 100 performs heating operation, the control unit 90 controls the first refrigeration cycle 10 so that the first refrigerant R1 circulates through the first compressor 11, the first high-pressure side heat exchanger 12, the expansion valve 16, the low-pressure side heat exchanger 17, and the first compressor 11 in that order. Also, when the vehicle temperature adjustment system 100 performs heating operation, the control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 circulates through the second compressor 21, the second high-pressure side heat exchanger 22, the expansion valve 26, the low-pressure side heat exchanger 27, and the second compressor 21 in that order.

[0040] When the vehicle temperature adjustment system 100 performs heating operation, the heating medium HM1 that has exchanged heat with the first refrigerant R1 in the first high-pressure side heat exchanger 12 is supplied to the interior heat exchanger 33. The control unit 90 controls the pump 71 and the switching valve 81 so that the heating medium HM1 circulates through the first high-pressure side heat exchanger 12, the pump 71, the switching valve 81, the interior heat exchanger 33, and the first high-pressure side heat exchanger 12 in this order.

[0041] In addition, the control unit 90 controls the pump 72, the switching valve 84, and the switching valve 85 so that the heating medium HM2 circulates through the second high-pressure side heat exchanger 22, the switching valve 85, the pump 72, the battery heat exchanger 40, the switching valve 84, and the second high-pressure side heat exchanger 22 in that order.

[0042] In addition, when the vehicle temperature control system 100 performs heating operation, the control unit 90 controls the pump 73, the switching valve 82, and the switching valve 83 so as to form a circulation flow path (first circulation flow path) C12 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 73, the switching valve 83, the low-pressure side heat exchanger 17, the switching valve 82, and the exterior heat exchanger 61 in that order.

[0043] In addition, when the vehicle temperature control system 100 is in heating operation, the control unit 90 controls the pump 73, the switching valve 82, the switching valve 84, and the switching valve 85 so as to form a second circulation flow path C22 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 73, the switching valve 84, the low-pressure side heat exchanger 27, the switching valve 85, the switching valve 82, and the exterior heat exchanger 61 in that order.

[0044] When the vehicle temperature control system 100 needs to heat the battery 4 during heating operation, the battery heat exchanger 40 is supplied with the heating medium HM2 that has passed through the second high-pressure side heat exchanger 22. The battery heat exchanger 40 heats the battery 4 by exchanging heat between the heating medium HM2 and the battery 4.

[0045] The functions and effects of the vehicle temperature adjustment system 100 of the present embodiment described above will be described.

[0046] According to the vehicle temperature adjustment system 100 of this embodiment, during cooling operation, the first refrigerant R1 decompressed by the first expansion valve 13 is supplied to the first low-pressure side heat exchanger 14, and the second refrigerant R2 decompressed by the second expansion valve 23 is supplied to the second low-pressure side heat exchanger 24. In the flow direction AD of the air guided by the blower 34, the second low-pressure side heat exchanger 24 is disposed upstream of the first low-pressure side heat exchanger 14. The air blown by the blower 34 is cooled by heat exchange with the second refrigerant R2 when passing through the second low-pressure side heat exchanger 24, and then cooled by heat exchange with the first refrigerant R1 when passing through the first low-pressure side heat exchanger 14. The air guided into the vehicle interior is cooled in two stages by the first refrigerant R1 and the second refrigerant R2.

[0047] Since two-stage cooling is performed using both the power of the first compressor 11 of the first refrigeration cycle 10 and the power of the second compressor 21 of the second refrigeration cycle 20, the compressor power required to achieve the desired cooling capacity is reduced compared to when one-stage cooling is performed using the power of a single compressor of a single refrigeration cycle, and the COP can be improved in a vehicle temperature control system equipped with multiple refrigeration cycles.

[0048] According to the vehicle temperature control system 100 of this embodiment, when performing cooling operation, the second pressure of the second refrigerant R2 that has passed through the second expansion valve 23 is made higher than the first pressure of the first refrigerant R1 that has passed through the first expansion valve 13, so that the temperature of the air blown from the blower 34 can be gradually reduced as it is blown from the upstream side to the downstream side along the flow direction.

[0049] According to the vehicle temperature control system 100 of this embodiment, during cooling operation, the temperature of the second refrigerant R2 passing through the second low-pressure side heat exchanger 24 is made higher than the temperature of the first refrigerant R1 passing through the first low-pressure side heat exchanger 14, so that the temperature of the air blown from the blower 34 can be gradually reduced as it is blown from the upstream side to the downstream side along the flow direction.

[0050] According to the vehicle temperature adjustment system 100 of this embodiment, during cooling operation, the cooling medium CM cooled by the second refrigerant R2 is supplied to the battery heat exchanger 40, so that the second refrigeration cycle 20 can simultaneously cool the air guided into the vehicle cabin and the battery 4. Furthermore, when cooling of the battery 4 is required, the power of the first compressor 11 can be reduced by using the second refrigeration cycle 20, which has a lower pressure than the first refrigeration cycle 10.

[0051] According to the vehicle temperature control system 100 of this embodiment, by circulating the heat exchange medium M3 in both the circulation flow path C11 and the circulation flow path C21, the heat recovered by the heat exchange medium M3 in both the first high-pressure side heat exchanger 12 and the second high-pressure side heat exchanger 22 can be appropriately dissipated in the external heat exchanger 61.

[0052] According to the vehicle temperature adjustment system 100 of this embodiment, during heating operation, the heating medium HM1 that has exchanged heat with the first refrigerant R1 in the first high pressure side heat exchanger 12 can heat the air that is guided into the vehicle compartment.

[0053] Second Embodiment Next, a vehicle temperature control system 100A according to a second embodiment of the present disclosure will be described with reference to the drawings. The second embodiment is a modified example of the first embodiment, and is the same as the first embodiment except as otherwise specifically described below, and therefore will not be described below.

[0054] In the vehicle temperature adjustment system 100 according to the first embodiment, during heating operation, the heating medium HM1 that has exchanged heat with the first refrigerant R1 in the first high-pressure side heat exchanger 12 is supplied to the interior heat exchanger 33. In contrast, in the vehicle temperature adjustment system 100A according to the present embodiment, during heating operation, the heating medium HM that has exchanged heat with the second refrigerant R2 in the second high-pressure side heat exchanger 22 is supplied to the interior heat exchanger 33.

[0055] 3 is a schematic diagram showing a vehicle temperature control system 100A according to a second embodiment of the present disclosure, showing a state in which the vehicle temperature control system 100A is performing cooling operation. As shown in FIG. 3, the vehicle temperature control system 100A includes a first refrigeration cycle 10, a second refrigeration cycle 20, an HVAC unit 30, a battery heat exchanger 40, a motor heat exchanger 50, an exterior heat exchange unit 60, pumps 71, 72, and 73, switching valves 81, 82, 83, and 84, and a control unit 90.

[0056] The first refrigeration cycle 10 has a first compressor 11, a first high-pressure side heat exchanger 12, a first expansion valve 13, a first low-pressure side heat exchanger 14, and a refrigerant flow path 15. The first refrigeration cycle 10 is connected by the refrigerant flow path 15, and when the vehicle temperature control system 100A performs cooling operation, the first refrigerant R1 is circulated through the first compressor 11, the first high-pressure side heat exchanger 12, the first expansion valve 13, the first low-pressure side heat exchanger 14, and the first compressor 11 in this order. The configuration of each part of the first refrigeration cycle 10 is the same as that of the first embodiment, so a description thereof will be omitted below.

[0057] The second refrigeration cycle 20 has a second compressor 21, a second high-pressure side heat exchanger 22, a second expansion valve 23, a second low-pressure side heat exchanger 24, a refrigerant flow path 25, an expansion valve 26, and a low-pressure side heat exchanger 27. The second refrigeration cycle 20 is connected by the refrigerant flow path 25, and when the vehicle temperature control system 100A performs cooling operation, the second refrigerant R2 is circulated through the second compressor 21, the second high-pressure side heat exchanger 22, the second expansion valve 23, the second low-pressure side heat exchanger 24, and the second compressor 21 in this order. The configuration of each part of the second refrigeration cycle 20 is the same as that of the first embodiment, so the following description will be omitted.

[0058] The HVAC unit 30 has a first low-pressure side heat exchanger 14, a second low-pressure side heat exchanger 24, an in-vehicle heat exchanger 33, a blower 34, and a temperature sensor 35. The second low-pressure side heat exchanger 24 is disposed upstream of the first low-pressure side heat exchanger 14 in the flow direction AD of the air guided by the blower 34. The in-vehicle heat exchanger 33 is disposed downstream of the first low-pressure side heat exchanger 14 in the flow direction AD of the air guided by the blower 34. The configurations of the various parts of the HVAC unit 30 are similar to those of the first embodiment, and therefore will not be described below.

[0059] When the vehicle temperature regulation system 100A is in cooling operation and the battery 4 needs to be cooled, the battery heat exchanger 40 is supplied with a cooling medium CM and exchanges heat with the battery 4 that stores the power used in the vehicle. The cooling medium CM is cooled by the second refrigerant R2, the pressure of which is reduced by the expansion valve 26, as it passes through the low-pressure side heat exchanger 27. When the vehicle temperature regulation system 100A is in cooling operation, the battery 4 is cooled by heat exchange with the cooling medium CM.

[0060] When the vehicle temperature regulation system 100A is performing cooling operation and heating operation and cooling of the driving motor 5 is required, the motor heat exchanger 50 is supplied with the heat exchange medium M3 and exchanges heat with the driving motor 5. When the vehicle temperature regulation system 100A is performing cooling operation and heating operation, the driving motor 5 is cooled by heat exchange with the heat exchange medium M3.

[0061] The exterior heat exchange unit 60 is a unit that exchanges heat between air (outside air) and a heat exchange medium M3 outside the vehicle, and includes an exterior heat exchanger 61 and a fan 62. The fan 62 blows air toward the exterior heat exchanger 61. The exterior heat exchanger 61 exchanges heat between the heat exchange medium M3 and the air (outside air).

[0062] The control unit 90 is a device that controls the vehicle temperature adjustment system 100 A. The control unit 90 controls each part of the vehicle temperature adjustment system 100 A, including the first refrigeration cycle 10, the second refrigeration cycle 20, the pumps 71, 72, and 73, and the switching valves 81, 82, 83, 84, and 85.

[0063] <Cooling operation> Here, the operation of the vehicle temperature adjustment system 100A during cooling operation will be described with reference to Fig. 3. As shown in Fig. 3, when the vehicle temperature adjustment system 100A performs cooling operation, the control unit 90 controls the first refrigeration cycle 10 so that the first refrigerant R1 circulates through the refrigerant flow path 15. Also, when the vehicle temperature adjustment system 100A performs cooling operation, the control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 circulates through the refrigerant flow path 25.

[0064] Furthermore, when the vehicle temperature adjustment system 100A performs cooling operation, the control unit 90 controls the pump 71 and the switching valve 81 to form a circulation flow path C13 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 71, the first high-pressure side heat exchanger 12, the switching valve 81, and the exterior heat exchanger 61 in that order. The control unit 90 also controls the pump 72, the switching valve 81, the switching valve 82, the switching valve 83, and the switching valve 84 to form a circulation flow path C23 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 71, the switching valve 82, the second high-pressure side heat exchanger 22, the pump 72, the switching valve 84, the switching valve 83, the switching valve 81, and the exterior heat exchanger 61 in that order.

[0065] When the vehicle temperature adjustment system 100A performs cooling operation, the control unit 90 controls the second pressure of the second refrigerant R2 that has passed through the second expansion valve 23 to be higher than the first pressure of the first refrigerant R1 that has passed through the first expansion valve 13. The control unit 90 also controls the temperature of the second refrigerant R2 that has passed through the second low-pressure side heat exchanger 24 to be higher than the temperature of the first refrigerant R1 that has passed through the first low-pressure side heat exchanger 14. In this way, the temperature of the air blown from the blower 34 can be gradually reduced as it is blown from the upstream side to the downstream side along the flow direction AD.

[0066] When the vehicle temperature adjustment system 100A is in air-conditioning operation and it is necessary to cool the battery 4, the cooling medium CM that has passed through the low-pressure side heat exchanger 27 is supplied to the battery heat exchanger 40. The cooling medium CM circulates through the low-pressure side heat exchanger 27, the switching valve 83, the switching valve 85, the pump 73, the battery heat exchanger 40, the switching valve 82, and the low-pressure side heat exchanger 27 in that order. The battery heat exchanger 40 cools the battery 4 by exchanging heat between the cooling medium CM and the battery 4.

[0067] When the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is equal to or higher than a first predetermined temperature (e.g., 30°C), the control unit 90 operates the first refrigeration cycle 10 to circulate the first refrigerant R1 through the refrigerant flow path 15, and operates the second refrigeration cycle 20 to circulate the second refrigerant R2 through the refrigerant flow path 25.

[0068] On the other hand, when the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is lower than a first predetermined temperature, the control unit 90 operates the first refrigeration cycle 10 while stopping the second refrigeration cycle 20. When stopping the second refrigeration cycle 20, the control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 does not circulate through the refrigerant flow path 25.

[0069] In addition, the control unit 90 may operate the first refrigeration cycle 10 to circulate the first refrigerant R1 through the refrigerant flow path 15, and operate the second refrigeration cycle 20 to circulate the second refrigerant R2 through the refrigerant flow path 25, when the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is less than a first predetermined temperature (e.g., 30°C) and is equal to or higher than a second predetermined temperature (e.g., 25°C), and the temperature of the battery 4 detected by the temperature sensor 4a is equal to or higher than a third predetermined temperature (e.g., 35°C).

[0070] <Heating operation> Next, the operation of the vehicle temperature control system 100A during heating operation will be described with reference to Fig. 4. Fig. 4 is a schematic configuration diagram showing the vehicle temperature control system 100A according to the second embodiment of the present disclosure, and shows a state in which the vehicle temperature control system 100A is performing heating operation.

[0071] 4, when the vehicle temperature adjustment system 100A performs heating operation, the control unit 90 controls the first refrigeration cycle 10 so that the first refrigerant R1 does not circulate through the refrigerant flow path 15. The control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 circulates through the second compressor 21, the second high-pressure side heat exchanger 22, the expansion valve 26, the low-pressure side heat exchanger 27, and the second compressor 21 in this order.

[0072] In addition, the control unit 90 controls the pump 72 and the switching valve 84 so that the heating medium HM circulates through the second high-pressure side heat exchanger 22, the pump 72, the switching valve 84, the in-vehicle heat exchanger (first in-vehicle heat exchanger) 33, and the second high-pressure side heat exchanger 22 in that order.

[0073] When the vehicle temperature adjustment system 100A performs heating operation, the heating medium HM that has exchanged heat with the second refrigerant R2 in the second high-pressure side heat exchanger 22 is supplied to the interior heat exchanger 33. The air blown by the blower 34 is heated by the heating medium HM as it passes through the interior heat exchanger 33.

[0074] Furthermore, when the vehicle temperature regulation system 100A performs heating operation, the control unit 90 controls the pump 71 and the switching valve 81 to form a circulation flow path C14 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 71, the first high pressure side heat exchanger 12, the switching valve 81, and the exterior heat exchanger 61 in that order. Furthermore, when the vehicle temperature regulation system 100A performs heating operation, the control unit 90 controls the pump 71 and the switching valve 81 to form a circulation flow path C24 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 71, the switching valve 82, the low pressure side heat exchanger 27, the switching valve 83, the switching valve 81, and the exterior heat exchanger 61 in that order.

[0075] According to the vehicle temperature adjustment system 100A of the present embodiment, during heating operation, the heating medium HM that has exchanged heat with the second refrigerant R2 in the second high pressure side heat exchanger 22 can heat the air guided into the vehicle compartment.

[0076] Third Embodiment Next, a vehicle temperature control system 100B according to a third embodiment of the present disclosure will be described with reference to the drawings. The third embodiment is a modified example of the first embodiment, and is the same as the first embodiment except as otherwise specifically described below, and therefore will not be described below.

[0077] The vehicle temperature adjustment system 100 according to the first embodiment supplies the heating medium HM1 that has exchanged heat with the first refrigerant R1 in the first high-pressure side heat exchanger 12 to the vehicle interior heat exchanger 33 during heating operation. In contrast, the vehicle temperature adjustment system 100B according to the present embodiment supplies the first refrigerant R1 compressed by the first compressor 11 to the vehicle interior heat exchanger 33 during heating operation.

[0078] 5 is a schematic diagram showing a vehicle temperature control system 100B according to a third embodiment of the present disclosure, showing a state in which the vehicle temperature control system 100B is performing cooling operation. As shown in FIG. 5, the vehicle temperature control system 100B includes a first refrigeration cycle 10, a second refrigeration cycle 20, an HVAC unit 30, a battery heat exchanger 40, a motor heat exchanger 50, an exterior heat exchange unit 60, pumps 71 and 72, switching valves 81, 82, 83, 84, 85, and 86, and a control unit 90.

[0079] The first refrigeration cycle 10 has a first compressor 11, a first high-pressure side heat exchanger 12, a first expansion valve 13, a first low-pressure side heat exchanger 14, a refrigerant flow path 15, an expansion valve 16, and a low-pressure side heat exchanger 17. The first refrigeration cycle 10 is connected by the refrigerant flow path 15, and when the vehicle temperature control system 100B performs cooling operation, the first refrigerant R1 is circulated through the first compressor 11, the first high-pressure side heat exchanger 12, the first expansion valve 13, the first low-pressure side heat exchanger 14, and the first compressor 11 in this order. The configuration of each part of the first refrigeration cycle 10 is the same as that of the first embodiment, so the following description will be omitted.

[0080] The second refrigeration cycle 20 has a second compressor 21, a second high-pressure side heat exchanger 22, a second expansion valve 23, a second low-pressure side heat exchanger 24, a refrigerant flow path 25, an expansion valve 26, and a low-pressure side heat exchanger 27. The second refrigeration cycle 20 is connected by the refrigerant flow path 25, and when the vehicle temperature control system 100B performs cooling operation, the second refrigerant R2 is circulated through the second compressor 21, the second high-pressure side heat exchanger 22, the second expansion valve 23, the second low-pressure side heat exchanger 24, and the second compressor 21 in this order. The configuration of each part of the second refrigeration cycle 20 is the same as that of the first embodiment, so the following description will be omitted.

[0081] The HVAC unit 30 has a first low-pressure side heat exchanger 14, a second low-pressure side heat exchanger 24, an in-vehicle heat exchanger 33, a blower 34, and a temperature sensor 35. The second low-pressure side heat exchanger 24 is disposed upstream of the first low-pressure side heat exchanger 14 in the flow direction AD of the air guided by the blower 34. The in-vehicle heat exchanger 33 is disposed downstream of the first low-pressure side heat exchanger 14 in the flow direction AD of the air guided by the blower 34. The configurations of the various parts of the HVAC unit 30 are similar to those of the first embodiment, and therefore will not be described below.

[0082] When the vehicle temperature regulation system 100B is in cooling operation and the battery 4 needs to be cooled, the battery heat exchanger 40 is supplied with a cooling medium CM and exchanges heat with the battery 4 that stores the electric power used in the vehicle. The cooling medium CM is cooled by the second refrigerant R2, the pressure of which is reduced by the expansion valve 26, as it passes through the low-pressure side heat exchanger 27. When the vehicle temperature regulation system 100B is in cooling operation, the battery 4 is cooled by heat exchange with the cooling medium CM.

[0083] When the vehicle temperature regulation system 100B is in cooling operation or heating operation and cooling of the driving motor 5 or waste heat recovery is required, the motor heat exchanger 50 is supplied with the heat exchange medium M3 and exchanges heat with the driving motor 5. When the vehicle temperature regulation system 100B is in cooling operation or heating operation, the driving motor 5 is cooled by heat exchange with the heat exchange medium M3.

[0084] The exterior heat exchange unit 60 is a unit that exchanges heat between air (outside air) and a heat exchange medium M3 outside the vehicle, and includes an exterior heat exchanger 61 and a fan 62. The fan 62 blows air toward the exterior heat exchanger 61. The exterior heat exchanger 61 exchanges heat between the heat exchange medium M3 and the air (outside air).

[0085] The control unit 90 is a device that controls the vehicle temperature adjustment system 100B. The control unit 90 controls each part of the vehicle temperature adjustment system 100B, including the first refrigeration cycle 10, the second refrigeration cycle 20, the pumps 71 and 72, and the switching valves 81, 82, 83, 84, and 85.

[0086] <Cooling operation> Here, the operation of the vehicle temperature adjustment system 100B during cooling operation will be described with reference to Fig. 5. As shown in Fig. 5, when the vehicle temperature adjustment system 100B performs cooling operation, the control unit 90 controls the first refrigeration cycle 10 so that the first refrigerant R1 circulates through the refrigerant flow path 15. Also, when the vehicle temperature adjustment system 100B performs cooling operation, the control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 circulates through the refrigerant flow path 25.

[0087] In addition, when the vehicle temperature control system 100B is operating in cooling mode, the control unit 90 controls the pump 71, the switching valve 81, and the switching valve 82 so as to form a circulation flow path C15 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 71, the switching valve 82, the first high-pressure side heat exchanger 12, the switching valve 81, and the exterior heat exchanger 61 in that order.

[0088] In addition, the control unit 90 controls the pump 71, the switching valve 81, the switching valve 84, and the switching valve 85 so as to form a circulation flow path C25 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 71, the switching valve 84, the second high-pressure side heat exchanger 22, the switching valve 85, the switching valve 81, and the exterior heat exchanger 61 in that order.

[0089] When the vehicle temperature adjustment system 100B performs cooling operation, the control unit 90 controls the second pressure of the second refrigerant R2 that has passed through the second expansion valve 23 to be higher than the first pressure of the first refrigerant R1 that has passed through the first expansion valve 13. The control unit 90 also controls the temperature of the second refrigerant R2 that has passed through the second low-pressure side heat exchanger 24 to be higher than the temperature of the first refrigerant R1 that has passed through the first low-pressure side heat exchanger 14. In this way, the temperature of the air blown from the blower 34 can be gradually reduced as it is blown from the upstream side to the downstream side along the flow direction AD.

[0090] When the vehicle temperature adjustment system 100B is in air-conditioning operation and it is necessary to cool the battery 4, the cooling medium CM that has passed through the low-pressure side heat exchanger 27 is supplied to the battery heat exchanger 40. The cooling medium CM circulates through the low-pressure side heat exchanger 27, the switching valve 85, the pump 72, the battery heat exchanger 40, the switching valve 84, and the low-pressure side heat exchanger 27 in that order. The battery heat exchanger 40 cools the battery 4 by exchanging heat between the cooling medium CM and the battery 4.

[0091] When the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is equal to or higher than a first predetermined temperature (e.g., 30°C), the control unit 90 operates the first refrigeration cycle 10 to circulate the first refrigerant R1 through the refrigerant flow path 15, and operates the second refrigeration cycle 20 to circulate the second refrigerant R2 through the refrigerant flow path 25.

[0092] On the other hand, when the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is lower than a first predetermined temperature, the control unit 90 operates the first refrigeration cycle 10 while stopping the second refrigeration cycle 20. When stopping the second refrigeration cycle 20, the control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 does not circulate through the refrigerant flow path 25.

[0093] In addition, the control unit 90 may operate the first refrigeration cycle 10 to circulate the first refrigerant R1 through the refrigerant flow path 15, and operate the second refrigeration cycle 20 to circulate the second refrigerant R2 through the refrigerant flow path 25, when the temperature of the air sucked into the second low-pressure side heat exchanger 24 detected by the temperature sensor 35 is less than a first predetermined temperature (e.g., 30°C) and is equal to or higher than a second predetermined temperature (e.g., 25°C), and the temperature of the battery 4 detected by the temperature sensor 4a is equal to or higher than a third predetermined temperature (e.g., 35°C).

[0094] <Heating operation> Next, the operation of the vehicle temperature control system 100B in heating operation will be described with reference to Fig. 6. Fig. 6 is a schematic configuration diagram showing the vehicle temperature control system 100B according to the third embodiment of the present disclosure, and shows the vehicle temperature control system 100B in heating operation.

[0095] 6, when the vehicle temperature adjustment system 100B performs heating operation, the control unit 90 controls the first refrigeration cycle 10 so that the first refrigerant R1 circulates through the first compressor 11, the in-vehicle heat exchanger 33, the switching valve 83, the expansion valve 16, the low-pressure side heat exchanger 17, and the first compressor 11 in that order. The control unit 90 may also control the second refrigeration cycle 20 so that the second refrigerant R2 circulates through the refrigerant flow path 25.

[0096] When the vehicle temperature adjustment system 100B is in heating operation, the first refrigerant R1 compressed by the first compressor 11 is supplied to the interior heat exchanger 33. The air blown by the blower 34 is heated by the first refrigerant R1 when passing through the interior heat exchanger 33. When the vehicle temperature adjustment system 100B is in heating operation, the damper 33a is disposed at a position retreated from the interior heat exchanger 33 so that the air blown from the blower 34 flows through the interior heat exchanger 33.

[0097] In addition, when the vehicle temperature control system 100B performs heating operation, the control unit 90 controls the second refrigeration cycle 20 so that the second refrigerant R2 circulates through the second compressor 21, the second high-pressure side heat exchanger 22, the expansion valve 26, the low-pressure side heat exchanger 27, and the second compressor 21 in that order.

[0098] When the vehicle temperature adjustment system 100B needs to heat the battery 4 during heating operation, the battery heat exchanger 40 is supplied with the heating medium HM that has passed through the second high-pressure side heat exchanger 22. The heating medium HM circulates through the second high-pressure side heat exchanger 22, the switching valve 85, the pump 72, the battery heat exchanger 40, the switching valve 84, and the second high-pressure side heat exchanger 22 in that order. The battery heat exchanger 40 exchanges heat between the heating medium HM and the battery 4, thereby heating the battery 4.

[0099] In addition, when the vehicle temperature control system 100B performs heating operation, the control unit 90 controls the pump 71 and the switching valve 81 so as to form a circulation flow path (first circulation flow path) C16 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 71, the switching valve 82, the low-pressure side heat exchanger 17, the switching valve 81, and the exterior heat exchanger 61 in that order.

[0100] In addition, the control unit 90 controls the pump 71, the switching valve 81, the switching valve 84, and the switching valve 85 so as to form a circulation flow path C26 in which the heat exchange medium M3 circulates through the exterior heat exchanger 61, the pump 71, the switching valve 84, the second high-pressure side heat exchanger 22, the switching valve 85, the switching valve 81, and the exterior heat exchanger 61 in that order.

[0101] According to the vehicle temperature adjustment system 100B of this embodiment, the air introduced into the vehicle compartment can be heated by the first refrigerant R1 compressed by the first compressor 11 during heating operation.

[0102] [Fourth embodiment] Next, a vehicle temperature control system 100C according to a fourth embodiment of the present disclosure will be described with reference to the drawings. The fourth embodiment is a modified example of the first embodiment, and is the same as the first embodiment except as otherwise specifically described below, and therefore will not be described below.

[0103] In the vehicle temperature adjustment system 100 according to the first embodiment, when cooling of the battery 4 is required during air-conditioning operation, the cooling medium CM that has passed through the low-pressure side heat exchanger 27 is supplied to the battery heat exchanger 40 to cool the battery 4. In contrast, in the vehicle temperature adjustment system 100C according to the present embodiment, the second refrigerant R2 decompressed by the expansion valve 16 is supplied to the battery heat exchanger 40 to cool the battery 4 during air-conditioning operation.

[0104] 7, when the vehicle temperature adjustment system 100C is in cooling operation, the battery heat exchanger 40 is supplied with the second refrigerant R2 and exchanges heat with the battery 4 that stores the electric power used in the vehicle. When the vehicle temperature adjustment system 100C is in cooling operation, the battery 4 is cooled by heat exchange with the second refrigerant R2 decompressed by the expansion valve 16.

[0105] The vehicle temperature control system according to each of the above-described embodiments can be understood, for example, as follows. A vehicle temperature control system according to a first aspect of the present disclosure includes a first refrigeration cycle (10) having a first compressor (11), a first high-pressure side heat exchanger (12) to which a first refrigerant (R1) compressed by the first compressor is supplied, a first expansion valve (13) for expanding the first refrigerant supplied from the first high-pressure side heat exchanger, and a first low-pressure side heat exchanger (14) to which the first refrigerant expanded by the first expansion valve is supplied and which guides the first refrigerant to the first compressor, a second compressor (21), a second high-pressure side heat exchanger (22) to which a second refrigerant compressed by the second compressor is supplied, and a second expansion valve (13) for expanding the second refrigerant supplied from the second high-pressure side heat exchanger. the second refrigeration cycle (20) having a valve (23) and a second low-pressure side heat exchanger (24) to which the second refrigerant expanded by the second expansion valve is supplied and which guides the second refrigerant to the second compressor, and a blower (34) which blows air to the first low-pressure side heat exchanger and the second low-pressure side heat exchanger and guides the air into the vehicle cabin, wherein the second low-pressure side heat exchanger is disposed upstream of the first low-pressure side heat exchanger in the flow direction of the air guided by the blower, and when the vehicle temperature control system performs cooling operation, the air cooled by the second refrigerant in the second low-pressure side heat exchanger is further cooled by the first refrigerant in the first low-pressure side heat exchanger.

[0106] According to the vehicle temperature control system according to the first aspect of the present disclosure, during cooling operation, the first refrigerant decompressed by the first expansion valve is supplied to the first low-pressure side heat exchanger, and the second refrigerant decompressed by the second expansion valve is supplied to the second low-pressure side heat exchanger. In the flow direction of the air guided by the blower, the second low-pressure side heat exchanger is disposed upstream of the first low-pressure side heat exchanger. The air blown by the blower is cooled by heat exchange with the second refrigerant when passing through the second low-pressure side heat exchanger, and is then cooled by heat exchange with the first refrigerant when passing through the first low-pressure side heat exchanger. The air guided into the vehicle cabin is cooled in two stages by the first refrigerant and the second refrigerant.

[0107] Since two stages of cooling are performed using both the power of the first compressor of the first refrigeration cycle and the power of the second compressor of the second refrigeration cycle, the power of the compressor required to achieve the desired cooling capacity is reduced compared to when one stage of cooling is performed using the power of a single compressor of a single refrigeration cycle, and the COP can be improved in a vehicle temperature control system equipped with multiple refrigeration cycles.

[0108] The vehicle temperature control system according to the second aspect of the present disclosure is the first aspect, and further includes the following configuration: A control unit (90) that controls the vehicle temperature control system, and when the vehicle temperature control system performs a cooling operation, the control unit controls the second pressure of the second refrigerant that has passed through the second expansion valve to be higher than the first pressure of the first refrigerant that has passed through the first expansion valve.

[0109] According to the vehicle temperature control system of the second aspect of the present disclosure, when performing cooling operation, the second pressure of the second refrigerant that has passed through the second expansion valve is made higher than the first pressure of the first refrigerant that has passed through the first expansion valve, so that the temperature of the air blown from the blower can be gradually reduced as it is blown from the upstream side to the downstream side along the flow direction.

[0110] The vehicle temperature control system according to the third aspect of the present disclosure is the second aspect, further including the following configuration: That is, when the vehicle temperature control system performs a cooling operation, the control unit controls the temperature of the second refrigerant passing through the second low-pressure side heat exchanger to be higher than the temperature of the first refrigerant passing through the first low-pressure side heat exchanger.

[0111] According to the vehicle temperature control system of the third aspect of the present disclosure, during cooling operation, the temperature of the second refrigerant passing through the second low-pressure side heat exchanger is made higher than the temperature of the first refrigerant passing through the first low-pressure side heat exchanger, so that the temperature of the air blown from the blower can be gradually reduced as it is blown from the upstream side to the downstream side along the flow direction.

[0112] The vehicle temperature control system according to a fourth aspect of the present disclosure is the first or second aspect, and further includes the following configuration: A battery heat exchanger (40) to which a cooling medium (CM) cooled by the second refrigerant is supplied and which exchanges heat with a battery (4) that stores electric power used in the vehicle when the vehicle temperature control system is in cooling operation.

[0113] According to the vehicle temperature control system relating to the fourth aspect of the present disclosure, during air-conditioning operation, a cooling medium cooled by a second refrigerant is supplied to a heat exchanger for a battery, so that the second refrigeration cycle can be used to simultaneously cool the air guided into the vehicle cabin and the battery.

[0114] The vehicle temperature control system according to a fifth aspect of the present disclosure, in the first or second aspect, further includes the following configuration: an exterior heat exchanger (61) that exchanges heat between a heat exchange medium and outside air, a first circulation flow path (C11) that circulates the heat exchange medium between the exterior heat exchanger and the first high-pressure side heat exchanger, and a second circulation flow path (C21) that circulates the heat exchange medium between the exterior heat exchanger and the second high-pressure side heat exchanger.

[0115] According to the vehicle temperature control system relating to the fifth aspect of the present disclosure, by circulating the heat exchange medium in both the first circulation flow path and the second circulation flow path, the heat recovered by the heat exchange medium in both the first high-pressure side heat exchanger and the second high-pressure side heat exchanger can be appropriately dissipated in the exterior heat exchanger.

[0116] The vehicle temperature control system according to a sixth aspect of the present disclosure is the first or second aspect, and further includes the following configuration: When the vehicle temperature control system performs a heating operation, the vehicle temperature control system includes an interior heat exchanger (33) to which a heating medium (HM1) that has exchanged heat with the first refrigerant in the first high-pressure side heat exchanger is supplied, and the interior heat exchanger heats the air introduced by the blower with the heating medium.

[0117] According to the vehicle temperature adjustment system according to the sixth aspect of the present disclosure, during heating operation, the air guided into the vehicle interior can be heated by the heating medium that has exchanged heat with the first refrigerant in the first high-pressure side heat exchanger.

[0118] The vehicle temperature control system according to a seventh aspect of the present disclosure is the first or second aspect, and further includes the following configuration: When the vehicle temperature control system performs a heating operation, the vehicle temperature control system includes an interior heat exchanger (33) to which a heating medium (HM) that has exchanged heat with the second refrigerant in the second high-pressure side heat exchanger is supplied, and the interior heat exchanger heats the air introduced by the blower with the heating medium.

[0119] According to the vehicle temperature adjustment system according to the seventh aspect of the present disclosure, during heating operation, the air guided into the vehicle compartment can be heated by the heating medium HM that has exchanged heat with the second refrigerant in the second high-pressure side heat exchanger.

[0120] The vehicle temperature control system according to an eighth aspect of the present disclosure is the first or second aspect, and further includes the following configuration: When the temperature of the air guided by the blower to the second low-pressure side heat exchanger is equal to or higher than a first predetermined temperature, the first refrigeration cycle is operated to supply the first refrigerant to the first low-pressure side heat exchanger, and the second refrigeration cycle is operated to supply the second refrigerant to the second low-pressure side heat exchanger.

[0121] The vehicle temperature control system according to the ninth aspect of the present disclosure is the fourth aspect, further including the following configuration: That is, when the temperature of the air guided by the blower to the second low-pressure side heat exchanger is equal to or higher than a first predetermined temperature, the first refrigeration cycle is operated to supply the first refrigerant to the first low-pressure side heat exchanger and the second refrigeration cycle is operated to supply the second refrigerant to the second low-pressure side heat exchanger, and when the temperature of the air guided by the blower to the second low-pressure side heat exchanger is equal to or higher than a second predetermined temperature lower than the first predetermined temperature and the temperature of the battery is equal to or higher than a third temperature, the first refrigeration cycle is operated to supply the first refrigerant to the first low-pressure side heat exchanger and the second refrigeration cycle is operated to supply the second refrigerant to the second low-pressure side heat exchanger.

[0122] The vehicle temperature control system according to a tenth aspect of the present disclosure is the eighth aspect, further comprising the following configuration: the vehicle temperature control system includes an inside air inlet that introduces air inside the vehicle cabin into the first low-pressure side heat exchanger and the second low-pressure side heat exchanger, and an outside air inlet that introduces air outside the vehicle cabin into the first low-pressure side heat exchanger and the second low-pressure side heat exchanger, and when a temperature of the air outside the vehicle cabin guided to the second low-pressure side heat exchanger by the blower is equal to or higher than the first predetermined temperature and a state is switched from introducing air inside the vehicle cabin from the inside air inlet to introducing air outside the vehicle cabin from the outside air inlet, the first refrigeration cycle is operated to supply the first refrigerant to the first low-pressure side heat exchanger, and the second refrigeration cycle is operated to supply the second refrigerant to the second low-pressure side heat exchanger. [Explanation of symbols]

[0123] 4. Battery 4a Temperature Sensor 5. Driving motor 10 First refrigeration cycle 11 First compressor 12 First high pressure side heat exchanger 13 First expansion valve 14 First low pressure side heat exchanger 15 Coolant flow path 16 Expansion valve 17 Low pressure side heat exchanger 20 Second refrigeration cycle 21 Second compressor 22 Second high pressure side heat exchanger 23 Second expansion valve 24 Second low pressure side heat exchanger 25 Coolant flow path 26 Expansion valve 27 Low pressure side heat exchanger 30 HVAC units 33 Vehicle heat exchanger 34 Blois 35 Temperature Sensor 40 Battery Heat Exchanger 50 Heat exchanger for motor 60 Exterior heat exchange unit 61 External heat exchanger 62 Fans 71, 72, 73 Pump 81, 82, 83, 84, 85, 86 Switching valve 90 Control section 100, 100A, 100B, 100C Vehicle temperature control system AD Air flow direction C11, C12, C13, C14, C15, C16 Circulation flow path (first circulation flow path) C21, C22, C23, C25, C26 Circulation flow path (second circulation flow path) CM cooling medium HM,HM1,HM2 Heating medium M3 heat exchange medium R1 First refrigerant R2 2nd refrigerant

Claims

1. A vehicle temperature control system, a first refrigeration cycle including a first compressor, a first high-pressure side heat exchanger to which a first refrigerant compressed by the first compressor is supplied, a first expansion valve to expand the first refrigerant supplied from the first high-pressure side heat exchanger, and a first low-pressure side heat exchanger to which the first refrigerant expanded by the first expansion valve is supplied and which guides the first refrigerant to the first compressor; a second refrigeration cycle including a second compressor, a second high-pressure side heat exchanger to which a second refrigerant compressed by the second compressor is supplied, a second expansion valve to expand the second refrigerant supplied from the second high-pressure side heat exchanger, and a second low-pressure side heat exchanger to which the second refrigerant expanded by the second expansion valve is supplied and which guides the second refrigerant to the second compressor; a blower that blows air to the first low-pressure side heat exchanger and the second low-pressure side heat exchanger and guides the air into a vehicle interior, the second low-pressure side heat exchanger is disposed upstream of the first low-pressure side heat exchanger in a flow direction of the air guided by the blower, A vehicle temperature control system, in which, when the vehicle temperature control system is operating in cooling mode, the air cooled by the second refrigerant in the second low-pressure side heat exchanger is further cooled by the first refrigerant in the first low-pressure side heat exchanger.

2. A control unit for controlling the vehicle temperature control system, The vehicle temperature control system of claim 1, wherein when the vehicle temperature control system is operating in cooling mode, the control unit controls the second pressure of the second refrigerant that has passed through the second expansion valve to be higher than the first pressure of the first refrigerant that has passed through the first expansion valve.

3. The vehicle temperature control system according to claim 2, wherein when the vehicle temperature control system is operating in cooling mode, the control unit controls the temperature of the second refrigerant passing through the second low-pressure side heat exchanger to be higher than the temperature of the first refrigerant passing through the first low-pressure side heat exchanger.

4. 3. The vehicle temperature control system according to claim 1, further comprising: a battery heat exchanger to which a cooling medium cooled by the second refrigerant is supplied when the vehicle temperature control system is in cooling operation, and which exchanges heat with a battery that stores electricity used in the vehicle.

5. an exterior heat exchanger that exchanges heat between a heat exchange medium and outside air; a first circulation flow path that circulates the heat exchange medium between the exterior heat exchanger and the first high pressure side heat exchanger; 3. The temperature adjustment system for a vehicle according to claim 1, further comprising: a second circulation flow path that circulates the heat exchange medium between the exterior heat exchanger and the second high pressure side heat exchanger.

6. a vehicle interior heat exchanger to which a heating medium that has exchanged heat with the first refrigerant in the first high-pressure side heat exchanger is supplied when the vehicle temperature control system performs a heating operation; 3. The vehicle temperature control system according to claim 1, wherein the vehicle interior heat exchanger heats the air guided by the blower with the heating medium.

7. a vehicle interior heat exchanger to which a heating medium that has exchanged heat with the second refrigerant in the second high-pressure side heat exchanger is supplied when the vehicle temperature control system performs a heating operation; 3. The vehicle temperature control system according to claim 1, wherein the vehicle interior heat exchanger heats the air guided by the blower with the heating medium.

8. 3. The vehicle temperature control system according to claim 1, wherein when a temperature of the air guided by the blower to the second low-pressure side heat exchanger is equal to or higher than a first predetermined temperature, the first refrigeration cycle is operated so that the first refrigerant is supplied to the first low-pressure side heat exchanger, and the second refrigeration cycle is operated so that the second refrigerant is supplied to the second low-pressure side heat exchanger.

9. when a temperature of the air guided to the second low-pressure side heat exchanger by the blower is equal to or higher than a first predetermined temperature, operating the first refrigeration cycle to supply the first refrigerant to the first low-pressure side heat exchanger, and operating the second refrigeration cycle to supply the second refrigerant to the second low-pressure side heat exchanger; 5. The vehicle temperature control system according to claim 4, wherein when the temperature of the air guided by the blower to the second low-pressure side heat exchanger is equal to or higher than a second predetermined temperature lower than the first predetermined temperature and the temperature of the battery is equal to or higher than a third temperature, the first refrigeration cycle is operated so that the first refrigerant is supplied to the first low-pressure side heat exchanger, and the second refrigeration cycle is operated so that the second refrigerant is supplied to the second low-pressure side heat exchanger.

10. an inside air inlet port that introduces air inside the vehicle cabin into the first low-pressure side heat exchanger and the second low-pressure side heat exchanger, and an outside air inlet port that introduces air outside the vehicle cabin into the first low-pressure side heat exchanger and the second low-pressure side heat exchanger, 9. The vehicle temperature control system according to claim 8, wherein when a temperature of the air outside the vehicle cabin guided by the blower to the second low-pressure side heat exchanger is equal to or higher than the first predetermined temperature and a state is switched from introducing air inside the vehicle cabin through the interior air inlet to introducing air outside the vehicle cabin through the exterior air inlet, the first refrigeration cycle is operated to supply the first refrigerant to the first low-pressure side heat exchanger, and the second refrigeration cycle is operated to supply the second refrigerant to the second low-pressure side heat exchanger.

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