Vehicle heat management system

Abstract

The present invention is provided with: a refrigerant circuit (1); condenser (5) having first compressor (10A) and second compressor (10B) and releasing heat to heating medium or outside air by means of refrigerant (R), first evaporator (4) for absorbing heat from inside air by means of refrigerant (R) expanded by means of first expansion valve (11) via condenser (5), and refrigerant (R) expanded by means of second expansion valve (12) via condenser (5) a second evaporator (6) that absorbs heat from the cooling medium or the outside air; and at least one of a heating medium circuit (2) having a heating medium pump (16) and a radiator (61) that radiates heat to an object to be heated by means of a heating medium (H), and a cooling medium circuit (3), the heating medium circuit (2) being provided with a heating medium pump (16) and a radiator (61) that radiates heat to the object to be heated by means of a heating medium (H). The cooling medium circuit (3) has a cooling medium pump (36) and a heat absorber (62) that absorbs heat from the object to be cooled by means of a cooling medium (L). At least one of heat release to the heating medium in the condenser (5) and heat absorption from the cooling medium in the second evaporator (4) is performed.

Description

Technical Field

[0001] The present invention relates to a thermal management system for a vehicle. Background Art

[0002] A battery electric vehicle (BEV) is equipped with a lithium ion secondary battery, a nickel-metal hydride secondary battery, or the like as a power storage device for storing electric power to be supplied to a traveling motor.

[0003] Batteries generate heat during charging and discharging, and if the high temperature state continues, deterioration will progress. The same is true for electrical components such as the driving motor and PCU (Power Control Unit). If the temperature is too high during high-speed driving, there is a concern that they may be damaged or malfunction. On the other hand, if the battery temperature is too low, the battery output will decrease. Therefore, a battery temperature control system that can cool and heat batteries and electrical components is required.

[0004] Patent document 1 discloses a conventional vehicle thermal management system capable of battery temperature control. The vehicle thermal management system is mounted on an electric vehicle, performs air conditioning in the vehicle cabin, and adjusts the temperature of a vehicle-mounted battery such as a secondary battery. The vehicle thermal management system includes a refrigerant circuit in which a compressor, an outdoor unit, a first expansion valve, a battery heat exchange unit, a second expansion valve, and an indoor unit are connected in this order through a refrigerant flow path.

[0005] The compressor compresses the refrigerant and circulates the refrigerant in the circuit. The outdoor unit exchanges heat between the outside air and the refrigerant. The first expansion valve and the second expansion valve decompress the refrigerant according to the degree of throttling. The battery heat exchange unit exchanges heat between the vehicle-mounted battery and the refrigerant. The indoor unit exchanges heat between the indoor air supplied to the vehicle cabin and the refrigerant.

[0006] In addition, the refrigerant circuit in the vehicle thermal management system further includes a direction switching unit for switching the circulation direction of the refrigerant circulating in the circuit. Furthermore, the operations of the first expansion valve, the second expansion valve and the direction switching unit in the refrigerant circuit are controlled by the control unit.

[0007] In this vehicle thermal management system, through the control of the control unit, the direction switching unit switches the circulation direction of the refrigerant circulating in the circuit and adjusts the opening of the first expansion valve and the second expansion valve, thereby realizing cooling and heating in the vehicle cabin and cooling and heating of the vehicle battery.

[0008] Prior art literature

[0009] Patent Literature

[0010] Patent Document 1: Japanese Patent Application Publication No. 2018-192968 Summary of the invention

[0011] Problems to be solved by the invention

[0012] In recent years, electric vehicles have attracted attention in the automotive industry from the perspective of improving the global environment, and their popularity has also increased. Therefore, new developments are required for systems that can appropriately cool batteries and electrical components and air condition the interior of an electric vehicle.

[0013] In particular, it is preferable if the heating / cooling capabilities for heating / cooling targets such as indoor air used for air conditioning in a vehicle cabin and a vehicle-mounted battery can be improved.

[0014] The present invention has been made in view of the above circumstances, and aims to provide a vehicle thermal management system that can heat a heating object or cool a cooling object and can improve its heating capacity or cooling capacity as a technical problem to be solved.

[0015] Technical solutions to solve problems

[0016] The vehicle thermal management system of the present invention is characterized in that:

[0017] have:

[0018] a refrigerant circuit comprising a first compressor and a second compressor connected in series via a first flow path and compressing a refrigerant, a condenser into which the refrigerant compressed by the second compressor is introduced and which uses the refrigerant to release heat to a heating medium or outside air, a first expansion valve and a second expansion valve that expand the refrigerant after passing through the condenser, a first evaporator into which the refrigerant expanded by the first expansion valve is introduced and which uses the refrigerant to absorb heat from indoor air, and a second evaporator into which the refrigerant expanded by the second expansion valve is introduced and which uses the refrigerant to absorb heat from a cooling medium or outside air, the first evaporator being connected to the first flow path via the second flow path, and the second evaporator being connected to the first compressor via a third flow path; and

[0019] a medium circuit of at least one of a heating medium circuit and a cooling medium circuit, the heating medium circuit having a heating medium pump for circulating the heating medium and a heat radiator for radiating heat to a heating object using the heating medium, and the cooling medium circuit having a cooling medium pump for circulating the cooling medium and a heat absorber for absorbing heat from a cooling object using the cooling medium,

[0020] At least one of heat release to the heating medium in the condenser and heat absorption from the cooling medium in the second evaporator is performed.

[0021] The vehicle thermal management system of the present invention performs at least one of heat release to the heating medium in the condenser and heat absorption from the cooling medium in the second evaporator.

[0022] If the refrigerant releases heat to the heating medium in the condenser, the heating medium heated by the refrigerant releases heat to the heating object in the radiator. Thus, when the heating object is, for example, indoor air supplied to the vehicle cabin, the indoor air heated by the heating medium can be used for heating the vehicle cabin. In addition, when the heating object is, for example, a vehicle-mounted battery, the vehicle-mounted battery can be heated by the heating medium.

[0023] When the refrigerant absorbs heat from the cooling medium in the second evaporator, the cooling medium cooled by the refrigerant absorbs heat from the cooling object in the heat absorber. Thus, when the cooling object is, for example, a vehicle battery or an electrical component, the vehicle battery or the electrical component can be cooled by the cooling medium.

[0024] Furthermore, by allowing the refrigerant to absorb heat from the indoor air in the first evaporator, the indoor air cooled by the refrigerant can be used to cool the vehicle interior.

[0025] Furthermore, in this vehicle thermal management system, if the refrigerant compressed by the first compressor is further compressed by the second compressor, the compression efficiency of the refrigerant in the refrigerant circuit can be improved, and the heating and cooling capabilities for the interior air, the vehicle battery, etc. can be improved.

[0026] Therefore, according to the vehicle thermal management system of the present invention, it is possible to heat the heating target or cool the cooling target, and to improve the heating capacity and cooling capacity.

[0027] Preferably, the second flow path and the third flow path are connected via a bypass flow path, and a first on-off valve is provided in the bypass flow path.

[0028] In this case, if the first on-off valve is opened, the refrigerant flowing out of the first evaporator can be introduced into the first compressor and the second compressor, and the refrigerant flowing out of the second evaporator can be introduced into the first compressor and the second compressor. On the other hand, if the first on-off valve is closed, the refrigerant flowing out of the first evaporator is introduced into the second compressor, and the refrigerant flowing out of the second evaporator is introduced into the first compressor, as in the case where there is no bypass flow path.

[0029] Preferably, the vehicle thermal management system further includes a control device. Also, preferably, the refrigerant circuit operates in a first mode, a second mode, a third mode, a fourth mode, and a fifth mode under control of the control device.

[0030] In the first mode, the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the second compressor and then releases heat to the heating medium or the outdoor air in the condenser. In the second mode, the refrigerant that absorbs heat from the cooling medium or the outdoor air in the second evaporator is compressed by the first compressor and the second compressor and then releases heat to the heating medium or the outdoor air in the condenser. In the third mode, the refrigerant that absorbs heat from the cooling medium or the outdoor air in the second evaporator is compressed by the second compressor and then releases heat to the heating medium or the outdoor air in the condenser. In the fourth mode, the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the second compressor and then releases heat to the heating medium or the outdoor air in the condenser, and the refrigerant that absorbs heat from the cooling medium or the outdoor air in the second evaporator is compressed by the first compressor and the second compressor and then releases heat to the heating medium or the outdoor air in the condenser. In the 5th mode, the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the second compressor and then releases heat to the heating medium or the outside air in the condenser. In addition, the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the second compressor and then releases heat to the heating medium or the outside air in the condenser.

[0031] Preferably, a second on-off valve is provided in the second flow path, and the second on-off valve is arranged downstream of the connection between the second flow path and the bypass flow path in the refrigerant flow. Also, preferably, the refrigerant circuit operates in the sixth mode under the control of the control device.

[0032] In the 6th mode, the refrigerant that absorbs heat from the indoor air in the 1st evaporator is compressed by the 1st compressor and the 2nd compressor, and then releases heat to the heating medium or the outside air in the condenser, and the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the 1st compressor and the 2nd compressor, and then releases heat to the heating medium or the outside air in the condenser.

[0033] Preferably, the condenser is a water-cooled condenser that performs heat exchange between the refrigerant and the heating medium.

[0034] In this case, the refrigerant releases heat to the heating medium in the water-cooled condenser, thereby heating the heating medium. In the heating medium circuit, the heating medium heated by the refrigerant can be used to heat indoor air, a vehicle battery, electrical components, and the like as heating objects.

[0035] Preferably, the second evaporator is a refrigerator that performs heat exchange between the refrigerant and the cooling medium.

[0036] In this case, the refrigerant absorbs heat from the cooling medium in the refrigerator, so that the cooling medium is cooled. In the cooling medium circuit, the cooling medium cooled by the refrigerant can be used to cool the vehicle-mounted battery, electrical components, etc., which are cooling targets.

[0037] Preferably, the first compressor is a speed type, and the second compressor is a volume type.

[0038] In this case, even when the outside temperature is extremely low and the temperature and density of the refrigerant in the refrigerant circuit are low, a high flow rate of refrigerant can be circulated in the refrigerant circuit using a speed-type compressor, thereby improving heating capacity and warm-up capacity.

[0039] Preferably, when the first compressor is a velocity type and the second compressor is a positive displacement type, a check valve is provided in the first flow path, and the check valve is arranged upstream of a connection between the first flow path and the second flow path in the refrigerant flow.

[0040] In this case, the check valve can prevent the refrigerant from flowing back to the speed type compressor.

[0041] Preferably, when the first compressor is a speed type and the second compressor is a volume type, an oil separator is provided on the refrigerant discharge side of the second compressor to separate lubricating oil from the refrigerant compressed by the second compressor and return it to the refrigerant suction side of the second compressor.

[0042] In this case, it is possible to suppress the lubricating oil from flowing into the speed type compressor and to supply the lubricating oil to the compression section of the positive displacement type compressor and the like.

[0043] Effects of the Invention

[0044] According to the vehicle heat management system of the present invention, it is possible to heat a heating target or cool a cooling target, and the heating capacity or cooling capacity can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 1 is a system configuration diagram conceptually showing the vehicle thermal management system according to the first embodiment.

[0046] Figure 2 1 is a system configuration diagram schematically showing the overall configuration of a vehicle thermal management system according to the first embodiment.

[0047] Figure 3 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a vehicle cabin cooling mode.

[0048] Figure 4 The vehicle heat management system according to the first embodiment is a system configuration diagram for explaining a vehicle interior heating mode.

[0049] Figure 5 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a battery cooling mode.

[0050] Figure 6The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a battery warm-up mode.

[0051] Figure 7 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a vehicle interior heating (at extremely low temperatures) mode.

[0052] Figure 8 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a vehicle interior heating (at extremely low temperatures) mode.

[0053] Fig. 9 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a battery warm-up (at extremely low temperatures) mode.

[0054] Fig.10 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a battery warm-up (at extremely low temperatures) mode.

[0055] Fig.11 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a battery cooling mode for cooling a vehicle interior.

[0056] Fig.12 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a vehicle interior cooling battery cooling (strong) mode.

[0057] Fig.13 The thermal management system for a vehicle according to the first embodiment is a system configuration diagram for explaining a battery warm-up mode for heating a vehicle interior.

[0058] Fig.14 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a battery warm-up mode (at extremely low temperatures) for heating the vehicle interior.

[0059] Fig.15 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining the battery warm-up mode (at extremely low temperatures) for heating the vehicle interior.

[0060] Fig.16 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining the vehicle interior cooling battery cooling (strong + cooling target device cooling) mode.

[0061] Fig.17 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining the dehumidification and heating mode in the vehicle cabin (at extremely low temperatures and with high heating demand).

[0062] Fig.18The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining the in-cabin dehumidification and heating battery warm-up mode (at extremely low temperatures and with high heating demand).

[0063] Fig.19 The vehicle thermal management system according to the first embodiment is a system configuration diagram for explaining a warm-up mode of a cooling target device.

[0064] Fig. 20 1 is a system configuration diagram schematically showing the overall configuration of a vehicle thermal management system according to the second embodiment. DETAILED DESCRIPTION

[0065] Hereinafter, embodiments 1 and 2 of the present invention will be described with reference to the accompanying drawings. The vehicle thermal management system of embodiments 1 and 2 is mounted on a battery-type electric vehicle. The vehicle thermal management system of embodiments 1 and 2 performs air conditioning in the vehicle cabin and adjusts the temperature of the vehicle battery and the cooling target device.

[0066] The vehicle-mounted battery constitutes a power storage device for supplying power to the driving motor. The vehicle-mounted battery has a plurality of battery cells, each of which is composed of a secondary battery such as a lithium-ion secondary battery. The cooling target equipment is, for example, an electric generator as a driving motor, a power control unit (PCU) including a converter for motor control and a DC-DC converter for boosting, electrical components such as a charger, and other vehicle-mounted heating elements.

[0067] (Example 1)

[0068] Figures 1 to 19 The vehicle thermal management system of the first embodiment shown in FIG. Figure 1 As is conceptually shown in the system configuration diagram in FIG. 1 , a refrigerant circuit 1 , a heating medium circuit 2 , a cooling medium circuit 3 , and a control device 9 are provided.

[0069] The refrigerant circuit 1 includes a first compressor 10A and a second compressor 10B, a condenser 5C, a first expansion valve 11, a second expansion valve 12, a first evaporator 4E, and a second evaporator 6E for compressing the refrigerant R. The first compressor 10A and the second compressor 10B are examples of "compressors" in the present invention.

[0070] The refrigerant circuit 1 includes a first annular flow path 14 and an intermediate flow path 15 as flow paths connecting the components.

[0071] In the first annular flow path 14, the first compressor 10A, the second compressor 10B, the condenser 5C, the second expansion valve 12, and the second evaporator 6E are connected and arranged in this order. The first annular flow path 14 has a first flow path 14A and a third flow path 14B as a part thereof. The first flow path 14A connects the first compressor 10A and the second compressor 10B. The third flow path 14B connects the second evaporator 6E and the first compressor 10A.

[0072] In the intermediate flow path 15, the first expansion valve 11 and the first evaporator 4E are connected and arranged in this order. The intermediate flow path 15 is connected to the connection portion 14a between the condenser 5C and the second expansion valve 12 in the first annular flow path 14, and the connection portion 14b between the first compressor 10A and the second compressor 10B in the first annular flow path 14. Thus, the first expansion valve 11 and the second expansion valve 12 are arranged in parallel with each other relative to the condenser 5C. The intermediate flow path 15 has a second flow path 15A as a part thereof, and the second flow path 15A connects the outlet of the first evaporator 4E to the first flow path 14A. The first expansion valve 11 and the second expansion valve 12 are examples of the "expansion valve" in the present invention.

[0073] The first compressor 10A compresses the refrigerant R introduced from the second evaporator 6E. The refrigerant R compressed by the first compressor 10A is introduced into the second compressor 10B, and the refrigerant R is compressed. The refrigerant R compressed by the second compressor 10B is introduced into the condenser 5C, and the refrigerant R releases heat to the heating medium H. The first expansion valve 11 and the second expansion valve 12 expand the refrigerant R after passing through the condenser 5C. The refrigerant R expanded by the first expansion valve 11 is introduced into the first evaporator 4E, and the refrigerant R absorbs heat from the indoor air. The refrigerant R expanded by the second expansion valve 12 is introduced into the second evaporator 6E, and the refrigerant R absorbs heat from the cooling medium L.

[0074] The heating medium circuit 2 includes a heating medium pump 16 for circulating the heating medium H and a radiator 61 for radiating heat to a heating target using the heating medium H. The heating target may be, for example, indoor air supplied to the vehicle interior or a vehicle-mounted battery.

[0075] The cooling medium circuit 3 includes a cooling medium pump 36 for circulating the cooling medium L and a heat absorber 62 for absorbing heat from a cooling target using the cooling medium L. Examples of the cooling target include a vehicle-mounted battery and electrical components.

[0076] In this thermal management system, one of the heating medium circuit 2 and the cooling medium circuit 3 may be omitted. When the heating medium circuit 2 is omitted, the refrigerant R releases heat to the outside air in the condenser 5C. In this case, in the cooling medium circuit 3, the cooling medium L cools the vehicle battery, electrical components, etc. in the heat absorber 62. When the cooling medium circuit 3 is omitted, the refrigerant R absorbs heat from the outside air in the second evaporator 6E. In this case, in the heating medium circuit 2, the heating medium H heats the indoor air, the vehicle battery, etc. in the heat radiator 61.

[0077] Hereinafter, a case where the vehicle interior is cooled and heated and the vehicle-mounted battery is cooled and warmed up using the thermal management system will be described in detail.

[0078] The thermal management system Figure 2 As schematically shown in the system configuration diagram, it includes a refrigerant circuit 1, a heating medium circuit 2, a cooling medium circuit 3, an evaporator 4, a water-cooled condenser 5, a refrigerator 6, a battery heat exchanger 7, a radiator 8, and a control device 9. The evaporator 4 is an example of the "first evaporator" in the present invention. The water-cooled condenser 5 is an example of the "condenser" in the present invention. The refrigerator 6 is an example of the "second evaporator" in the present invention. The battery heat exchanger 7 is an example of the "radiator" in the present invention, and is also an example of the "heat absorber" in the present invention. The radiator 8 is an example of the "radiator" in the present invention, and is also an example of the "heat absorber" in the present invention.

[0079] Here, in Figures 2 to 19 In FIG. 1 , the flow paths (pipes) connecting the components of the refrigerant circuit 1 and the heating medium circuit 2 are shown by solid lines, and the flow paths (pipes) connecting the components of the cooling medium circuit 3 are shown by single-dot chain lines. Figure 3 to Figure 19 In the figure, the flow path (pipe) without refrigerant flow in the refrigerant circuit 1 is indicated by a dotted line, the flow path (pipe) without heating medium flow in the heating medium circuit 2 is indicated by a dotted line, and the flow path (pipe) without cooling medium flow in the cooling medium circuit 3 is indicated by a dotted line. In addition, the flow of heat is indicated by a thick double-dashed arrow. Figure 3 to Figure 19 In the figure, the control device 9 is omitted.

[0080] The water-cooled condenser 5 is integrated into both the refrigerant circuit 1 and the heating medium circuit 2 to connect the refrigerant circuit 1 and the heating medium circuit 2. The refrigerator 6 is integrated into both the refrigerant circuit 1 and the cooling medium circuit 3 to connect the refrigerant circuit 1 and the cooling medium circuit 3.

[0081] The refrigerant circuit 1 cools the vehicle cabin by exchanging heat between the refrigerant R circulating in the circuit and the indoor air that is the indoor air transported into the vehicle cabin. In addition, the refrigerant circuit 1 heats the heating medium H by releasing heat from the refrigerant R to the heating medium H by exchanging heat between the refrigerant R circulating in the circuit and the heating medium H of the heating medium circuit 2; and cools the cooling medium L by absorbing heat from the cooling medium L by exchanging heat between the refrigerant R circulating in the circuit and the cooling medium L of the cooling medium circuit 3. The heating medium H and the cooling medium L are LLC (Long-term Coolant) mainly composed of ethylene glycol and propylene glycol.

[0082] The refrigerant circuit 1 includes a first compressor 10A, a check valve 64, a second compressor 10B, an oil separator 65, a water-cooled condenser 5, a first expansion valve 11, a second expansion valve 12, a vaporizer 4, a refrigerator 6, and an evaporation pressure regulating valve (EPR) 13. In addition, the refrigerant circuit 1 includes a first annular flow path 14, an intermediate flow path 15, and a bypass flow path 63 as flow paths connecting the components.

[0083] In the first annular flow path 14, the first compressor 10A, the check valve 64, the second compressor 10B, the oil separator 65, the water-cooled condenser 5, the second expansion valve 12, and the refrigerator 6 are connected and arranged in this order. In the intermediate flow path 15, the first expansion valve 11, the evaporator 4, and the evaporation pressure regulating valve 13 are connected and arranged in this order. The first annular flow path 14 has a first flow path 14A and a third flow path 14B as a part thereof. The first flow path 14A connects the first compressor 10A and the second compressor 10B. The third flow path 14B connects the refrigerator 6 and the first compressor 10A.

[0084] The intermediate flow path 15 is connected to the connection portion 14a between the water-cooled condenser 5 and the second expansion valve 12 in the first annular flow path 14, and the connection portion 14b between the check valve 64 and the second compressor 10B in the first annular flow path 14. Thus, the first expansion valve 11 and the second expansion valve 12 are arranged in parallel with each other with respect to the water-cooled condenser 5. The intermediate flow path 15 has a second flow path 15A as a part thereof. The second flow path 15A connects the outlet of the vaporizer 4 to the first flow path 14A.

[0085] The bypass flow path 63 connects the second flow path 15A and the third flow path 14B. A first opening and closing valve 66 is provided in the bypass flow path 63. A second opening and closing valve 67 is provided in the second flow path 15A. The second opening and closing valve 67 is arranged on the downstream side of the refrigerant flow than the connection portion 15a between the second flow path 15A and the bypass flow path 63. The first opening and closing valve 66 and the second opening and closing valve 67 are controlled by the control device 9 to open and close.

[0086] The first compressor 10A and the second compressor 10B are controlled by the control device 9 to compress the refrigerant R and circulate the refrigerant R in the first annular flow path 14 and the intermediate flow path 15. The circulation direction of the refrigerant R in the refrigerant circuit 1 is Figure 1 That is, the refrigerant R compressed by the first compressor 10A goes to the check valve 64, and the refrigerant R compressed by the second compressor 10B goes to the oil separator 65. The first compressor 10A is a speed type, specifically a centrifugal compressor. The second compressor 10B is a positive displacement type, specifically a scroll compressor.

[0087] The check valve 64 is provided in the first flow passage 14A. The check valve 64 is arranged on the upstream side of the refrigerant flow relative to the connection portion 14b between the first flow passage 14A and the second flow passage 15A.

[0088] The oil separator 65 is arranged on the refrigerant discharge side of the second compressor 10B, specifically, near the outlet of the second compressor 10B in the first annular flow path 14. The oil separator 65 separates lubricating oil from the refrigerant R discharged from the second compressor 10B, and returns the lubricating oil to the refrigerant suction side of the second compressor 10B, specifically, to the suction passage in the second compressor 10B, via a return flow path not shown.

[0089] The first expansion valve 11 and the second expansion valve 12 are both electronic expansion valves capable of adjusting the valve opening within a range of 0% to 100%. The valve openings of the first expansion valve 11 and the second expansion valve 12 are controlled by the control device 9 .

[0090] The evaporator 4 performs heat exchange between the indoor air sent into the vehicle cabin by the blower fan (not shown) and the refrigerant R. That is, in the evaporator 4, heat is absorbed from the indoor air by the refrigerant R. The indoor air cooled by the heat exchange with the refrigerant R is sent into the vehicle cabin by the blower fan (not shown) and used for cooling the vehicle cabin. When the valve opening of the first expansion valve 11 is 0%, the refrigerant R is not introduced into the evaporator 4, and the function of the evaporator 4 stops.

[0091] The evaporation pressure regulating valve 13 prevents the evaporation pressure of the refrigerant in the evaporator 4 from falling below a set value.

[0092] The refrigerator 6 performs heat exchange between the cooling medium L circulating in the cooling medium circuit 3 and the refrigerant R. That is, in the refrigerator 6, heat is absorbed from the cooling medium L by the refrigerant R. The cooling medium L cooled by the heat exchange with the refrigerant R cools the vehicle-mounted battery in the battery heat exchanger 7 disposed in the cooling medium circuit 3. When the valve opening of the second expansion valve 12 is 0%, the refrigerant R is not introduced into the refrigerator 6, and the function of the refrigerator 6 is stopped.

[0093] The heating medium circuit 2 includes a heating medium pump 16, a water-cooled condenser 5, a heater core 17, a battery heat exchanger 7, a radiator 8, and a cooler 18. In addition, the heating medium circuit 2 includes a second annular flow path 19, a fourth flow path 20, a fifth flow path 21, a sixth flow path 22, a seventh flow path 23, an eighth flow path 24, a ninth flow path 25, and a tenth flow path 26 as flow paths connecting the components.

[0094] A first three-way valve 27 is arranged at the connection portion between the fourth flow path 20 and the fifth flow path 21, and a second three-way valve 28 is arranged at the connection portion between the fifth flow path 21 and the sixth flow path 22. In addition, a third on-off valve 29 is arranged in the second annular flow path 19 between the connection portion 19a between the second annular flow path 19 and the fourth flow path 20 and the connection portion 19b between the second annular flow path 19 and the sixth flow path 22. In the fifth flow path 21, the battery heat exchanger 7 and the fourth on-off valve 30 are arranged in this order. In addition, the arrangement order of the battery heat exchanger 7 and the fourth on-off valve 30 in the fifth flow path 21 may be reversed.

[0095] The third three-way valve 31 is arranged at the connection portion between the seventh flow path 23 and the eighth flow path 24, and the fourth three-way valve 32 is arranged at the connection portion between the eighth flow path 24 and the ninth flow path 25. In addition, the fifth on-off valve 33 is arranged in the second annular flow path 19 between the connection portion 19c between the second annular flow path 19 and the seventh flow path 23 and the connection portion 19d between the second annular flow path 19 and the ninth flow path 25. In the eighth flow path 24, the sixth on-off valve 34 and the radiator 8 are arranged in this order. In addition, the arrangement order of the sixth on-off valve 34 and the radiator 8 in the eighth flow path 24 may be reversed.

[0096] The tenth flow path 26 is connected to the connection portion between the heating medium pump 16 and the water-cooled condenser 5 in the second annular flow path 19, and the connection portion between the water-cooled condenser 5 and the heater core 17 in the second annular flow path 19. The cooler 18 is arranged in the tenth flow path 26. Thus, the water-cooled condenser 5 and the cooler 18 are arranged in parallel. A three-way flow regulating valve 35 is arranged in the connection portion between the heating medium pump 16 and the water-cooled condenser 5 in the second annular flow path 19.

[0097] The three-way flow regulating valve 35 is controlled by the control device 9 so that the heating medium H circulating in the heating medium circuit 2 selectively flows through one of the water-cooled condenser 5 and the cooler 18, or flows through both the water-cooled condenser 5 and the cooler 18 while adjusting the flow rate.

[0098] The heating medium pump 16 is controlled by the control device 9 to circulate the heating medium H in the second annular flow path 19 and the fourth flow path 20 to the tenth flow path 26. The circulation direction of the heating medium H in the heating medium circuit 2 is Figure 1clockwise direction.

[0099] The water-cooled condenser 5 performs heat exchange between the refrigerant R circulating in the refrigerant circuit 1 and the heating medium H circulating in the heating medium circuit 2 .

[0100] The heater core 17 exchanges heat between the interior air delivered to the vehicle cabin by an air supply fan (not shown) and the heating medium H. The air supply fan is provided near the heater core 17 and delivers the interior air to the heater core 17. That is, in the heater core 17, heat is released to the interior air by the heating medium H. The heater core 17 is an example of a "heat radiator" in the present invention. The interior air to which the heating medium H releases heat in the heater core 17 is an example of a "heating object" in the present invention. The interior air heated by the heat exchange with the heating medium H is delivered to the vehicle cabin by an air supply fan (not shown) and used for heating the vehicle cabin. The function of the heater core 17 is stopped by stopping the air supply fan (not shown) or by stopping the air supply to the heater core 17 by operating the damper 17A provided near the heater core 17 and regulating the air supply to the heater core 17.

[0101] The battery heat exchanger 7 performs heat exchange between the heating medium H circulating in the heating medium circuit 2 and the vehicle battery. The fifth flow path 21 is connected to the temperature regulating flow path adjacent to the vehicle battery. In the battery heat exchanger 7, the heating medium H circulating in the temperature regulating flow path performs heat exchange with the vehicle battery, and heat is released from the heating medium H to the vehicle battery, and the vehicle battery is warmed up. In addition, the battery heat exchanger 7 performs heat exchange between the cooling medium L circulating in the cooling medium circuit 3 and the vehicle battery. In the battery heat exchanger 7, the cooling medium L circulating in the temperature regulating flow path performs heat exchange with the vehicle battery, and heat absorption from the vehicle battery by the cooling medium L is performed, and the vehicle battery is cooled. The vehicle battery is an example of a "heating object" in the present invention, and is also an example of a "cooling object" in the present invention.

[0102] The radiator 8 performs heat exchange between the heating medium H circulating in the heating medium circuit 2 and the outside air. The heating medium H releases heat to the outside air by the heat exchange between the heating medium H in the radiator 8 and the outside air. In addition, the radiator 8 performs heat exchange between the cooling medium L circulating in the cooling medium circuit 3 and the outside air. The cooling medium L absorbs heat from the outside air by the heat exchange between the cooling medium L in the radiator 8 and the outside air. A cooling fan (not shown) for conveying outside air to the radiator 8 and a damper 8A for adjusting the air supply to the radiator 8 are provided near the radiator 8. The function of the radiator 8 is stopped by stopping the cooling fan (not shown) or stopping the air supply to the radiator 8 by operating the damper 8A.

[0103] The cooler 18 performs heat exchange between the heating medium H circulating in the heating medium circuit 2 and the cooling target device. The 10th flow path 26 is connected to the temperature control flow path adjacent to the cooling target device. In the cooler 18, the heating medium H circulating in the temperature control flow path performs heat exchange with the cooling target device, and the heating medium H absorbs heat from the cooling target device, so that the cooling target device is cooled.

[0104] The cooling medium circuit 3 includes a cooling medium pump 36, a radiator 8, a battery heat exchanger 7, and a refrigerator 6. In addition, the cooling medium circuit 3 includes a third annular flow path 37, a fourth flow path 20, a fifth flow path 21, a sixth flow path 22, a seventh flow path 23, an eighth flow path 24, and a ninth flow path 25 as flow paths connecting the components.

[0105] A seventh on-off valve 38 is disposed in the third annular flow path 37 between the connection portion 37a between the third annular flow path 37 and the seventh flow path 23 and the connection portion 37b between the third annular flow path 37 and the ninth flow path 25. In addition, an eighth on-off valve 39 is disposed in the third annular flow path 37 between the connection portion 37c between the third annular flow path 37 and the fourth flow path 20 and the connection portion 37d between the third annular flow path 37 and the sixth flow path 22.

[0106] The cooling medium pump 36 is controlled by the control device 9 to circulate the cooling medium L in the third annular flow path 37 and the fourth flow path 20 to the ninth flow path 25. The circulation direction of the cooling medium L in the cooling medium circuit 3 is Figure 1 counterclockwise direction.

[0107] The first three-way valve 27, the second three-way valve 28, the third three-way valve 31, the fourth three-way valve 32, the three-way flow rate regulating valve 35, the first opening and closing valve 66, the second opening and closing valve 67, the third opening and closing valve 29, the fourth opening and closing valve 30, the fifth opening and closing valve 33, the sixth opening and closing valve 34, the seventh opening and closing valve 38, and the eighth opening and closing valve 39 are controlled by the control device 9. The first three-way valve 27, the second three-way valve 28, the third three-way valve 31, the fourth three-way valve 32, the third opening and closing valve 29, the fourth opening and closing valve 30, the fifth opening and closing valve 33, the sixth opening and closing valve 34, the seventh opening and closing valve 38, and the eighth opening and closing valve 39 are referred to as a valve group in the following description.

[0108] The control device 9 includes an electronic control device, and controls the operation of the refrigerant circuit 1, the heating medium circuit 2, and the cooling medium circuit 3. Specifically, the control device 9 controls the operation of the first compressor 10A, the second compressor 10B, the first expansion valve 11, the second expansion valve 12, the first opening and closing valve 66, and the second opening and closing valve 67 in the refrigerant circuit 1. The control device 9 controls the operation of the heating medium pump 16, the heater core 17, the first three-way valve 27, the second three-way valve 28, the third three-way valve 31, the fourth three-way valve 32, the three-way flow rate regulating valve 35, the third opening and closing valve 29, the fourth opening and closing valve 30, the fifth opening and closing valve 33, the sixth opening and closing valve 34, and the radiator 8 in the heating medium circuit 2. The control device 9 controls the operation of the cooling medium pump 36, the first three-way valve 27, the second three-way valve 28, the third three-way valve 31, the fourth three-way valve 32, the fourth on-off valve 30, the sixth on-off valve 34, the seventh on-off valve 38, the eighth on-off valve 39 and the radiator 8 in the cooling medium circuit 3.

[0109] The heater core 17 and the radiator 8 are switched and controlled by the control device 9 as follows.

[0110] That is, the heater core 17 in the heating medium circuit 2 is switched and controlled to be in an operating state in which the air supply fan (not shown) is operated and the damper 17A is opened so that the indoor air is supplied to the heater core 17, and in a stopped state in which the air supply fan (not shown) is stopped or the damper 17A is closed so that the indoor air is not supplied to the heater core 17. In the operating state of the heater core 17, the heating medium H exchanges heat with the indoor air, and the heating medium H releases heat to the indoor air.

[0111] The radiator 8 in the heating medium circuit 2 is switched and controlled to be in an operating state in which the cooling fan (not shown) is operated and the damper 8A is opened to supply the outside air to the radiator 8, and in a stopped state in which the cooling fan (not shown) is stopped or the damper 8A is closed and the outside air is not supplied to the radiator 8. In the operating state of the radiator 8 in the heating medium circuit 2, the heating medium H exchanges heat with the outside air, and the heating medium H releases heat to the outside air.

[0112] The radiator 8 in the cooling medium circuit 3 is switched and controlled to be in an operating state in which the cooling fan (not shown) is operated and the damper 8A is opened to supply the outside air to the radiator 8, and in a stopped state in which the cooling fan (not shown) is stopped or the damper 8A is closed and the outside air is not supplied to the radiator 8. In the operating state of the radiator 8 in the cooling medium circuit 3, the cooling medium L exchanges heat with the outside air, and the cooling medium L absorbs heat from the outside air.

[0113] The flow of the refrigerant R in the refrigerant circuit 1 operates in the following first to sixth modes by the opening and closing control of the first on-off valve 66 and the second on-off valve 67 by the controller 9 .

[0114] exist Figure 3 In the first mode shown, the refrigerant R that absorbs heat from the indoor air in the evaporator 4 is compressed by the second compressor 10B and then releases heat to the heating medium H in the water-cooled condenser 5 .

[0115] exist Figure 7 , 8 In the second mode shown in FIGS. 9 , 10 , 14 , and 15 , the refrigerant R that absorbs heat from the cooling medium L in the refrigerator 6 is compressed by the first compressor 10A and the second compressor 10B, and then releases heat to the heating medium H in the water-cooled condenser 5 .

[0116] exist Figure 4 , 5 In the third mode shown in FIGS. 6 and 13 , the refrigerant R that absorbs heat from the cooling medium L in the refrigerator 6 is compressed by the second compressor 10B and then releases heat to the heating medium H in the water-cooled condenser 5 .

[0117] exist Fig.17 , 18 In the fourth mode shown, the refrigerant R that absorbs heat from the indoor air in the evaporator 4 is compressed by the second compressor 10B and then releases heat to the heating medium H in the water-cooled condenser 5. Moreover, the refrigerant R that absorbs heat from the cooling medium L in the refrigerator 6 is compressed by the first compressor 10A and the second compressor 10B and then releases heat to the heating medium H in the water-cooled condenser 5.

[0118] exist Fig.11 In the fifth mode shown, the refrigerant R that absorbs heat from the indoor air in the evaporator 4 is compressed by the second compressor 10B and then releases heat to the heating medium H in the water-cooled condenser 5. Moreover, the refrigerant R that absorbs heat from the cooling medium L in the refrigerator 6 is compressed by the second compressor 10B and then releases heat to the heating medium H in the water-cooled condenser 5.

[0119] exist Fig.12 , 16 In the sixth mode shown, the refrigerant R that has absorbed heat from the indoor air in the evaporator 4 is compressed by the first compressor 10A and the second compressor 10B, and then releases heat to the heating medium H in the water-cooled condenser 5. In addition, the refrigerant R that has absorbed heat from the cooling medium L in the refrigerator 6 is compressed by the first compressor 10A and the second compressor 10B, and then releases heat to the heating medium H in the water-cooled condenser 5.

[0120] The valve groups in the heating medium circuit 2 and the cooling medium circuit 3 are controlled by the control device 9 to be in the following first to fifth connection states.

[0121] like Figure 3As shown, in the first connection state, the third on-off valve 29 and the sixth on-off valve 34 are in the open state, and the fourth on-off valve 30, the fifth on-off valve 33, the seventh on-off valve 38, and the eighth on-off valve 39 are in the closed state. In addition, the third three-way valve 31 and the fourth three-way valve 32 are in a state where the heating medium H of the heating medium circuit 2 flows in the radiator 8 instead of the cooling medium L of the cooling medium circuit 3. As a result, in the heating medium circuit 2, the heating medium H does not flow in the battery heat exchanger 7 but flows in the radiator 8. In addition, at this time, in the cooling medium circuit 3, the cooling medium L does not flow in both the battery heat exchanger 7 and the radiator 8, and the opening and closing of the seventh on-off valve 38 and the eighth on-off valve 39 are arbitrary.

[0122] like Figure 4 , 7 As shown in FIGS. 8 and 17, in the second connection state, the third on-off valve 29, the fifth on-off valve 33, the sixth on-off valve 34 and the eighth on-off valve 39 are in the open state, and the fourth on-off valve 30 and the seventh on-off valve 38 are in the closed state. In addition, the first three-way valve 27 and the second three-way valve 28 are in a state where the heating medium H of the heating medium circuit 2, rather than the cooling medium L of the cooling medium circuit 3, flows in the battery heat exchanger 7. In addition, the third three-way valve 31 and the fourth three-way valve 32 are in a state where the cooling medium L of the cooling medium circuit 3, rather than the heating medium H of the heating medium circuit 2, flows in the radiator 8. As a result, in the heating medium circuit 2, the heating medium H does not flow in both the battery heat exchanger 7 and the radiator 8. On the other hand, in the cooling medium circuit 3, the cooling medium L flows in the radiator 8, but does not flow in the battery heat exchanger 7. In the second connection state, the first three-way valve 27 and the second three-way valve 28 may be in a state where the cooling medium L of the cooling medium circuit 3 flows through the battery heat exchanger 7 instead of the heating medium H of the heating medium circuit 2 .

[0123] like Figure 5 , 11, 12, and 16, in the third connection state, the third on-off valve 29, the fourth on-off valve 30, the sixth on-off valve 34, and the seventh on-off valve 38 are in the open state, and the fifth on-off valve 33 and the eighth on-off valve 39 are in the closed state. In addition, the first three-way valve 27 and the second three-way valve 28 are in a state where the cooling medium L of the cooling medium circuit 3 flows in the battery heat exchanger 7 instead of the heating medium H of the heating medium circuit 2. In addition, the third three-way valve 31 and the fourth three-way valve 32 are in a state where the heating medium H of the heating medium circuit 2 flows in the radiator 8 instead of the cooling medium L of the cooling medium circuit 3. As a result, in the heating medium circuit 2, the heating medium H does not flow in the battery heat exchanger 7 but flows in the radiator 8. On the other hand, in the cooling medium circuit 3, the cooling medium L does not flow in the radiator 8 but flows in the battery heat exchanger 7.

[0124] like Figure 6 , 9 , 10, 13, 14, 15, and 18, in the fourth connection state, the fourth on-off valve 30, the fifth on-off valve 33, the sixth on-off valve 34, and the eighth on-off valve 39 are in the open state, and the third on-off valve 29 and the seventh on-off valve 38 are in the closed state. In addition, the first three-way valve 27 and the second three-way valve 28 are in a state where the heating medium H of the heating medium circuit 2, rather than the cooling medium L of the cooling medium circuit 3, flows in the battery heat exchanger 7. In addition, the third three-way valve 31 and the fourth three-way valve 32 are in a state where the cooling medium L of the cooling medium circuit 3, rather than the heating medium H of the heating medium circuit 2, flows in the radiator 8. As a result, in the heating medium circuit 2, the heating medium H flows in the battery heat exchanger 7, but does not flow in the radiator 8. On the other hand, in the cooling medium circuit 3, the cooling medium L flows in the radiator 8, but does not flow in the battery heat exchanger 7.

[0125] like Fig.19 As shown, in the fifth connection state, the third on-off valve 29 and the fifth on-off valve 33 are in the open state, and the fourth on-off valve 30, the sixth on-off valve 34, the seventh on-off valve 38, and the eighth on-off valve 39 are in the closed state. As a result, in the heating medium circuit 2, the heating medium H does not flow through both the battery heat exchanger 7 and the radiator 8. In addition, at this time, in the cooling medium circuit 3, the cooling medium L does not flow through both the battery heat exchanger 7 and the radiator 8, and the opening and closing of the seventh on-off valve 38 and the eighth on-off valve 39 are arbitrary.

[0126] In this way, the control device 9 controls the flow of the heating medium H and the cooling medium L to the battery heat exchanger 7 and the radiator 8. That is, the control device 9 selectively flows one of the heating medium H and the cooling medium L to the battery heat exchanger 7 and the radiator 8, or does not flow both of them.

[0127] The vehicle thermal management system of the first embodiment having the above-mentioned structure operates in each operation mode of the cabin cooling mode, cabin heating mode, battery cooling mode, battery warming mode, cabin heating (at extremely low temperature) mode, cabin heating (at extremely low temperature) mode, battery warming (at extremely low temperature) mode, battery warming (at extremely low temperature) mode, cabin cooling battery cooling mode, cabin cooling battery cooling (strong) mode, cabin heating battery warming mode, cabin heating battery warming (at extremely low temperature) mode, cabin heating battery warming (at extremely low temperature) mode, cabin cooling battery cooling (strong + cooling target device cooling) mode, cabin dehumidification and heating (at extremely low temperature, large heating demand) mode, cabin dehumidification and heating battery warming (at extremely low temperature, large heating demand) mode, and cooling target device preheating mode, for example, as described below, under the control of the control device 9. Extremely low temperature refers to a temperature in a predetermined range below the freezing point, for example, and extremely low temperature refers to a temperature lower than extremely low temperature.

[0128] (In-cabin cooling mode)

[0129] like Figure 3 As shown, in the cabin cooling mode, in the refrigerant circuit 1, the second compressor 10B, the first expansion valve 11 and the evaporation pressure regulating valve 13 are in the working state, the first compressor 10A and the second expansion valve 12 are in the stopped state, the first opening and closing valve 66 is in the closed state, and the second opening and closing valve 67 is in the open state. In addition, the heating medium pump 16 and the radiator 8 are in the working state, and the heater core 17 and the cooling medium pump 36 are in the stopped state. In addition, the valve components in the heating medium circuit 2 and the cooling medium circuit 3 are in the first connection state. In addition, the three-way flow regulating valve 35 is in a state in which the heating medium H flows not in the 10th flow path 26 where the cooler 18 is arranged, but in the water-cooled condenser 5 side.

[0130] Thus, the refrigerant circuit 1 operates in the first mode. That is, the refrigerant R compressed and discharged by the second compressor 10B flows through the water-cooled condenser 5, the first expansion valve 11, the evaporator 4, and the evaporation pressure regulating valve 13 in this order. At this time, the refrigerant R is prevented from flowing back to the first compressor 10A by the check valve 64. The refrigerant R discharged from the second compressor 10B is expanded in the first expansion valve 11 via the water-cooled condenser 5, and then introduced into the evaporator 4. Then, in the evaporator 4, through the heat exchange between the refrigerant R and the indoor air, the indoor air releases heat to the refrigerant R. As a result, the indoor air is cooled. The indoor air cooled by the refrigerant R is used for cooling the interior of the vehicle. The refrigerant R flowing out of the evaporator 4 is compressed by the second compressor 10B, and then introduced into the water-cooled condenser 5.

[0131] When the refrigerant R circulates in the refrigerant circuit 1, an oil separator 65 is provided on the refrigerant discharge side of the second compressor 10B, and the lubricating oil separated by the oil separator 65 is returned to the refrigerant suction side of the second compressor 10B via a return flow path (not shown). Therefore, it is possible to suppress the lubricating oil in the second positive displacement compressor 10B from flowing into the first speed type compressor 10A. This is also the same in the following modes.

[0132] In the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5, the heater core 17 in a stopped state, and the radiator 8 in an operating state in this order. In the water-cooled condenser 5, heat exchange is performed between the refrigerant R and the heating medium H, and the refrigerant R releases heat to the heating medium H. As a result, the refrigerant R is cooled. The heating medium H heated by the refrigerant R releases heat to the outside air in the radiator 8.

[0133] In this way, the vehicle interior can be cooled according to the cooling capacity of the refrigerant circuit 1 .

[0134] (In-cabin heating mode)

[0135] like Figure 4 As shown, in the cabin heating mode, in the refrigerant circuit 1, the second compressor 10B and the second expansion valve 12 are in the working state, the first compressor 10A, the first expansion valve 11 and the evaporation pressure regulating valve 13 are in the stopped state, and the first on-off valve 66 and the second on-off valve 67 are in the open state. In addition, the heating medium pump 16, the cooling medium pump 36, the heater core 17 and the radiator 8 are in the working state. And the valve groups in the heating medium circuit 2 and the cooling medium circuit 3 are in the second connection state. In addition, the three-way flow regulating valve 35 is in a state where the heating medium H flows not in the 10th flow path 26 where the cooler 18 is arranged, but on the side of the water-cooled condenser 5.

[0136] Thus, in the cooling medium circuit 3, the cooling medium L pumped by the cooling medium pump 36 flows in this order through the radiator 8 and the refrigerator 6 in the working state. In the radiator 8, the cooling medium L absorbs heat from the outside air through heat exchange between the cooling medium L and the outside air. The cooling medium L heated by the outside air is introduced into the refrigerator 6.

[0137] The refrigerant circuit 1 operates in the third mode. That is, the refrigerant R compressed by the second compressor 10B flows through the water-cooled condenser 5, the second expansion valve 12, and the refrigerator 6 in this order. In the refrigerator 6, the refrigerant R absorbs heat from the cooling medium L through heat exchange between the cooling medium L and the refrigerant R. The refrigerant R heated by the cooling medium L is compressed by the second compressor 10B and further heated, and then introduced into the water-cooled condenser 5.

[0138] In the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5 and the heater core 17 in the working state in this order. In the water-cooled condenser 5, the heating medium H absorbs heat from the refrigerant R through heat exchange between the refrigerant R and the heating medium H. As a result, the heating medium H is heated. The heating medium H heated by the refrigerant R is introduced into the heater core 17. In the heater core 17, the indoor air absorbs heat from the heating medium H through heat exchange between the heating medium H and the indoor air. As a result, the indoor air is heated and used for heating the vehicle cabin.

[0139] In this way, the vehicle interior can be heated according to the heating capacity of the refrigerant circuit 1 while utilizing the heat of the air.

[0140] (Battery Cooling Mode)

[0141] like Figure 5 As shown, in the battery cooling mode, in the refrigerant circuit 1, the second compressor 10B and the second expansion valve 12 are in the working state, the first compressor 10A, the first expansion valve 11 and the evaporation pressure regulating valve 13 are in the stopped state, and the first on-off valve 66 and the second on-off valve 67 are in the open state. In addition, the heating medium pump 16, the cooling medium pump 36 and the radiator 8 are in the working state, and the heater core 17 is in the stopped state. In addition, the valve groups in the heating medium circuit 2 and the cooling medium circuit 3 are in the third connection state. In addition, the three-way flow regulating valve 35 is in a state where the heating medium H flows on the water-cooled condenser 5 side instead of the 10th flow path 26 where the cooler 18 is arranged.

[0142] Thus, the cooling medium circuit 3 operates in the third mode. That is, the cooling medium L pumped by the cooling medium pump 36 flows through the battery heat exchanger 7 and the refrigerator 6 in this order. In the battery heat exchanger 7, the vehicle battery releases heat to the cooling medium L through heat exchange between the cooling medium L and the vehicle battery. As a result, the vehicle battery is cooled. The cooling medium L heated by the vehicle battery is introduced into the refrigerator 6.

[0143] In the refrigerant circuit 1, the refrigerant R compressed by the second compressor 10B flows through the water-cooled condenser 5, the second expansion valve 12, and the refrigerator 6 in this order. In the refrigerator 6, the cooling medium L releases heat to the refrigerant R through heat exchange between the cooling medium L and the refrigerant R. As a result, the cooling medium L is cooled. The refrigerant R heated by the cooling medium L is introduced from the refrigerator 6 to the second compressor 10B, and after being compressed by the second compressor 10B, is introduced to the water-cooled condenser 5.

[0144] In the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5, the heater core 17 in a stopped state, and the radiator 8 in an operating state in this order. In the water-cooled condenser 5, the refrigerant R releases heat to the heating medium H through heat exchange between the refrigerant R and the heating medium H. As a result, the refrigerant R is cooled. The heating medium H heated by the refrigerant R is introduced into the radiator 8 in an operating state. In the radiator 8, the heating medium H releases heat to the outside air through heat exchange between the heating medium H and the outside air. As a result, the heating medium H is cooled.

[0145] In this way, the vehicle-mounted battery can be cooled according to the cooling capacity of the refrigerant circuit 1 .

[0146] (Battery warm-up mode)

[0147] like Figure 6 As shown, in the battery warm-up mode, in the refrigerant circuit 1, the second compressor 10B and the second expansion valve 12 are in the working state, the first compressor 10A, the first expansion valve 11 and the evaporation pressure regulating valve 13 are in the stopped state, and the first on-off valve 66 and the second on-off valve 67 are in the open state. In addition, the heating medium pump 16, the cooling medium pump 36, and the radiator 8 are in the working state, and the heater core 17 is in the stopped state. In addition, the valve groups in the heating medium circuit 2 and the cooling medium circuit 3 are in the fourth connection state. In addition, the three-way flow regulating valve 35 is in a state where the heating medium H flows not in the 10th flow path 26 where the cooler 18 is arranged, but on the side of the water-cooled condenser 5.

[0148] Thus, in the cooling medium circuit 3, the cooling medium L pumped by the cooling medium pump 36 flows in this order through the radiator 8 and the refrigerator 6 in the working state. In the radiator 8, the cooling medium L absorbs heat from the outside air through heat exchange between the cooling medium L and the outside air. As a result, the cooling medium L is heated. The cooling medium L heated by the outside air is introduced into the refrigerator 6.

[0149] The refrigerant circuit 1 operates in the third mode. That is, the refrigerant R compressed by the second compressor 10B flows through the water-cooled condenser 5, the second expansion valve 12, and the refrigerator 6 in this order. In the refrigerator 6, the refrigerant R absorbs heat from the cooling medium L through heat exchange between the cooling medium L and the refrigerant R. As a result, the refrigerant R is heated. The refrigerant R heated by the cooling medium L is introduced from the refrigerator 6 to the second compressor 10B, compressed by the second compressor 10B and further heated, and then introduced to the water-cooled condenser 5.

[0150] In the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5, the heater core 17 in a stopped state, and the battery heat exchanger 7 in this order. In the water-cooled condenser 5, the heating medium H absorbs heat from the refrigerant R through heat exchange between the refrigerant R and the heating medium H. As a result, the heating medium H is heated. The heating medium H heated by the refrigerant R is introduced into the battery heat exchanger 7. In the battery heat exchanger 7, the vehicle-mounted battery absorbs heat from the heating medium H through heat exchange between the heating medium H and the vehicle-mounted battery. As a result, the vehicle-mounted battery is heated.

[0151] In this way, the vehicle-mounted battery can be warmed up according to the warming capacity of the refrigerant circuit 1 while utilizing the heat of the air.

[0152] (In-cabin heating (extremely low temperature) mode)

[0153] like Figure 7 As shown, in the cabin heating (very low temperature) mode, in the refrigerant circuit 1, the first compressor 10A, the second compressor 10B and the second expansion valve 12 are in operation, the first expansion valve 11 and the evaporation pressure regulating valve 13 are in a stopped state, and the first on-off valve 66 and the second on-off valve 67 are in a closed state. In addition, the heating medium pump 16, the cooling medium pump 36, the heater core 17, and the radiator 8 are in operation.

[0154] Thus, the refrigerant circuit 1 operates in the second mode. That is, the refrigerant R heated by the cooling medium L in the refrigerator 6 is introduced into the first compressor 10A. Then, the refrigerant R compressed by the first compressor 10A is further compressed by the second compressor 10B. Therefore, the compression efficiency of the refrigerant R in the refrigerant circuit 1 is improved, so the heating capacity is improved.

[0155] Furthermore, since the first compressor 10A is a speed type, the heating capacity can be improved while avoiding an increase in the size of the first compressor 10A.

[0156] Other components and functions Figure 4 The cabin heating mode shown is the same.

[0157] (In-cabin heating (extremely low temperature) mode)

[0158] like Figure 8 As shown, in the cabin heating (extremely low temperature) mode, in the heating medium circuit 2, the three-way flow control valve 35 is in a state where the heating medium H flows on the water-cooled condenser 5 side and flows in the 10th flow path 26 where the cooler 18 is configured.

[0159] Thus, in the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5 and the heater core 17 in the working state in this order, and the heating medium H pumped by the heating medium pump 16 flows through the cooler 18 and the heater core 17 in the working state in this order. In the cooler 18, the heating medium H absorbs heat from the cooling target device through heat exchange between the heating medium H and electrical components such as the travel motor and PCU as the cooling target device. As a result, the heating medium H is heated. In this way, the heating capacity is further improved by utilizing the heat absorbed from the travel motor, etc. In addition, in the refrigerant circuit 1, it works in the second mode. In addition, in the cooler 18, the cooling target device is cooled by the heating medium H absorbing heat from the cooling target device.

[0160] Other components and functions Figure 7 The same is true for the cabin heating (very low temperature) mode shown.

[0161] (Battery warm-up (extremely low temperature) mode)

[0162] like Fig. 9 As shown, in the battery warm-up mode (at very low temperatures), Figure 7Similarly, in the cabin heating (at extremely low temperature) mode shown, in the refrigerant circuit 1, the first compressor 10A, the second compressor 10B, and the second expansion valve 12 are in operation, the first expansion valve 11 and the evaporation pressure regulating valve 13 are in a stopped state, and the first on-off valve 66 and the second on-off valve 67 are in a closed state. In addition, the heating medium pump 16, the cooling medium pump 36, and the radiator 8 are in operation, and the heater core 17 is in a stopped state.

[0163] Thus, the refrigerant circuit 1 operates in the second mode. That is, the refrigerant R heated by the cooling medium L in the refrigerator 6 is introduced into the first compressor 10A. Then, the refrigerant R compressed by the first compressor 10A is further compressed by the second compressor 10B. Therefore, the compression efficiency of the refrigerant R in the refrigerant circuit 1 is improved, so the warm-up capacity is improved.

[0164] Furthermore, since the first compressor 10A is of a speed type, it is possible to improve the warm-up capability while avoiding an increase in the size of the first compressor 10A.

[0165] Other components and functions Figure 6 The battery warm-up mode shown is the same.

[0166] (Battery warm-up (extremely low temperature) mode)

[0167] like Fig.10 As shown, in the battery warm-up mode (extremely low temperature), Figure 8 In the cabin heating (extremely low temperature) mode shown, in the heating medium circuit 2, the three-way flow control valve 35 is in a state where the heating medium H flows on the water-cooled condenser 5 side and flows in the 10th flow path 26 where the cooler 18 is arranged.

[0168] Thus, in the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5 and the battery heat exchanger 7 in the working state in this order, and the heating medium H pumped by the heating medium pump 16 flows through the cooler 18 and the battery heat exchanger 7 in the working state in this order. In the cooler 18, the heating medium H absorbs heat from the cooling target device through heat exchange between the heating medium H and electrical components such as the travel motor and PCU as the cooling target device. As a result, the heating medium H is heated. In this way, by utilizing the heat absorbed from the travel motor, etc., the warm-up capacity is further improved. In addition, in the refrigerant circuit 1, it works in the second mode.

[0169] Other components and functions Fig. 9 The battery warm-up (very low temperature) mode shown is the same.

[0170] (Battery cooling mode for cabin cooling)

[0171] like Fig.11 As shown, in the vehicle interior cooling battery cooling mode, the second compressor 10B, the first expansion valve 11, the second expansion valve 12, and the evaporation pressure regulating valve 13 are in the working state, the first compressor 10A is in the stopped state, and the first on-off valve 66 and the second on-off valve 67 are in the open state. In addition, the heating medium pump 16, the cooling medium pump 36, and the radiator 8 are in the working state, and the heater core 17 is in the stopped state. In addition, the valve components in the heating medium circuit 2 and the cooling medium circuit 3 are in the third connection state. In addition, the three-way flow regulating valve 35 is in a state where the heating medium H flows not in the 10th flow path 26 where the cooler 18 is configured but on the side of the water-cooled condenser 5.

[0172] Other components and functions Figure 5 The battery cooling pattern shown is the same.

[0173] Thus, in the cooling medium circuit 3, the cooling medium L pumped by the cooling medium pump 36 flows through the battery heat exchanger 7 and the refrigerator 6 in this order. In the battery heat exchanger 7, the vehicle battery releases heat to the cooling medium L through heat exchange between the cooling medium L and the vehicle battery. As a result, the vehicle battery is cooled. The cooling medium L heated by the vehicle battery is introduced into the refrigerator 6.

[0174] The refrigerant circuit 1 operates in the fifth mode. That is, the refrigerant R compressed by the second compressor 10B flows through the water-cooled condenser 5, the first expansion valve 11, the evaporator 4, and the evaporation pressure regulating valve 13 in this order, and the refrigerant R compressed by the second compressor 10B flows through the water-cooled condenser 5, the second expansion valve 12, and the refrigerator 6 in this order. In the refrigerator 6, the cooling medium L releases heat to the refrigerant R through heat exchange between the cooling medium L and the refrigerant R. As a result, the cooling medium L is cooled. The refrigerant R heated by the cooling medium L is introduced from the refrigerator 6 to the second compressor 10B, compressed by the second compressor 10B, and then introduced to the water-cooled condenser 5. In addition, in the evaporator 4, the indoor air releases heat to the refrigerant R through heat exchange between the refrigerant R expanded by the first expansion valve 11 and the indoor air. As a result, the indoor air is cooled. The indoor air cooled by the refrigerant R is used for cooling the interior of the vehicle. The refrigerant R flowing out of the evaporator 4 is introduced into the second compressor 10B, compressed by the second compressor 10B, and then introduced into the water-cooled condenser 5 .

[0175] In the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5, the heater core 17 in a stopped state, and the radiator 8 in an operating state in this order. In the water-cooled condenser 5, the refrigerant R releases heat to the heating medium H through heat exchange between the refrigerant R and the heating medium H. As a result, the refrigerant R is cooled. The heating medium H heated by the refrigerant R is introduced into the radiator 8 in an operating state. In the radiator 8, the heating medium H releases heat to the outside air through heat exchange between the heating medium H and the outside air. As a result, the heating medium H is cooled.

[0176] In this way, the interior of the vehicle cabin can be cooled according to the cooling capacity of the refrigerant circuit 1 , and the vehicle-mounted battery can be cooled according to the cooling capacity of the refrigerant circuit 1 .

[0177] (In-cabin cooling battery cooling (strong) mode)

[0178] like Fig.12 As shown, in the vehicle interior cooling battery cooling (strong) mode, in the refrigerant circuit 1, the first compressor 10A, the second compressor 10B, the first expansion valve 11, the second expansion valve 12 and the evaporation pressure regulating valve 13 are in the operating state, the first on-off valve 66 is in the open state, and the second on-off valve 67 is in the closed state. In addition, the heating medium pump 16, the cooling medium pump 36 and the radiator 8 are in the operating state, and the heater core 17 is in the stopped state. In addition, the three-way flow regulating valve 35 is in a state in which the heating medium H flows not in the 10th flow path 26 where the cooler 18 is arranged, but in the water-cooled condenser 5 side.

[0179] Thus, the refrigerant circuit 1 operates in the sixth mode. That is, both the refrigerant R flowing out of the evaporator 4 and the refrigerant R flowing out of the refrigerator 6 are introduced into the first compressor 10A, compressed by the first compressor 10A, and then further compressed by the second compressor 10B. Therefore, the compression efficiency of the refrigerant R in the refrigerant circuit 1 is improved, so the refrigeration and cooling capacity is improved.

[0180] Furthermore, since the first compressor 10A is a speed type, the refrigeration / cooling capacity can be improved while avoiding an increase in the size of the first compressor 10A.

[0181] Other components and functions Fig.11 The battery cooling mode shown for interior cooling is the same.

[0182] (In-cabin heating battery warm-up mode)

[0183] like Fig.13As shown, in the vehicle cabin heating battery warm-up mode, the second compressor 10B and the second expansion valve 12 are in the working state, the first compressor 10A, the first expansion valve 11 and the evaporation pressure regulating valve 13 are in the stopped state, and the first on-off valve 66 and the second on-off valve 67 are in the open state. In addition, the heating medium pump 16, the cooling medium pump 36, the heater core 17 and the radiator 8 are in the working state. And the valve group in the heating medium circuit 2 and the cooling medium circuit 3 is in the fourth connection state. In addition, the three-way flow regulating valve 35 is in a state where the heating medium H flows not in the 10th flow path 26 where the cooler 18 is arranged, but on the side of the water-cooled condenser 5.

[0184] Thus, in the cooling medium circuit 3, the cooling medium L pumped by the cooling medium pump 36 flows in this order through the radiator 8 and the refrigerator 6 in the working state. In the radiator 8, the cooling medium L absorbs heat from the outside air through heat exchange between the cooling medium L and the outside air. The cooling medium L heated by the outside air is introduced into the refrigerator 6.

[0185] The refrigerant circuit 1 operates in the third mode. That is, the refrigerant R compressed by the second compressor 10B flows through the water-cooled condenser 5, the second expansion valve 12, and the refrigerator 6 in this order. In the refrigerator 6, the cooling medium L releases heat to the refrigerant R through heat exchange between the cooling medium L and the refrigerant R. The refrigerant R heated by the cooling medium L is introduced from the refrigerator 6 to the second compressor 10B, is further compressed and heated by the second compressor 10B, and is then introduced to the water-cooled condenser 5.

[0186] In the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5, the heater core 17 in operation, and the battery heat exchanger 7 in this order. In the water-cooled condenser 5, the heating medium H absorbs heat from the refrigerant R through heat exchange between the refrigerant R and the heating medium H. As a result, the heating medium H is heated. The heating medium H heated by the refrigerant R is introduced to the heater core 17. In the heater core 17, the indoor air absorbs heat from the heating medium H through heat exchange between the heating medium H and the indoor air. As a result, the indoor air is heated and used for heating the vehicle cabin. In addition, the heating medium H after passing through the heater core 17 is introduced to the battery heat exchanger 7. In the battery heat exchanger 7, the vehicle battery absorbs heat from the heating medium H through heat exchange between the heating medium H and the vehicle battery. As a result, the vehicle battery is heated.

[0187] In this way, the vehicle cabin can be heated by the heating capacity of the refrigerant circuit 1 while utilizing the heat of the air, and the vehicle-mounted battery can be warmed up by the warming capacity of the refrigerant circuit 1 .

[0188] (In-cabin heating battery warm-up (extremely low temperature) mode)

[0189] like Fig.14 As shown, in the cabin heating battery warm-up (extremely low temperature) mode, Figure 7 Similarly, in the cabin heating (at extremely low temperature) mode shown, in the refrigerant circuit 1, the first compressor 10A, the second compressor 10B, and the second expansion valve 12 are in operation, the first expansion valve 11 and the evaporation pressure regulating valve 13 are in a stopped state, and the first on-off valve 66 and the second on-off valve 67 are in a closed state. In addition, the heating medium pump 16, the cooling medium pump 36, the heater core 17, and the radiator 8 are in operation.

[0190] Thus, the refrigerant circuit 1 operates in the second mode. That is, the refrigerant R heated by the cooling medium L in the refrigerator 6 is introduced into the first compressor 10A. Then, the refrigerant R compressed by the first compressor 10A is further compressed by the second compressor 10B. Therefore, the compression efficiency of the refrigerant R in the refrigerant circuit 1 is improved, so the heating and warming-up capacity is improved.

[0191] Furthermore, since the first compressor 10A is of a speed type, it is possible to improve the heating and warming-up capabilities while avoiding an increase in the size of the first compressor 10A.

[0192] Other components and functions Fig.13 The battery warm-up mode for interior heating is shown in the same way.

[0193] (In-cabin heating battery warm-up (extremely low temperature) mode)

[0194] like Fig.15 As shown, in the cabin heating battery warm-up (extremely low temperature) mode, Figure 8 In the heating (extremely low temperature) mode shown, in the heating medium circuit 2, the three-way flow control valve 35 is in a state where the heating medium H flows on the water-cooled condenser 5 side and flows in the 10th flow path 26 where the cooler 18 is arranged.

[0195] Thus, in the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows through the water-cooled condenser 5 and the heater core 17 in the working state in this order, and the heating medium H pumped by the heating medium pump 16 flows through the cooler 18 and the heater core 17 in the working state in this order. In the cooler 18, the heating medium H absorbs heat from the cooling target device through heat exchange between the heating medium H and the electric components such as the travel motor and PCU as the cooling target device. As a result, the heating medium H is heated. In this way, by utilizing the heat absorbed from the travel motor, etc., the heating and warming-up capacity is further improved. In addition, in the refrigerant circuit 1, it works in the second mode.

[0196] Other components and functions Fig.14 The battery warm-up (very low temperature) mode for cabin heating shown is the same.

[0197] (In-cabin cooling battery cooling (strong + cooling target equipment cooling) mode)

[0198] like Fig.16 As shown, in the cabin cooling battery cooling (strong + cooling target equipment cooling) mode, Fig.12 Similarly, in the cabin cooling battery cooling (strong) mode shown in the figure, in the refrigerant circuit 1, the first compressor 10A, the second compressor 10B, the first expansion valve 11, the second expansion valve 12 and the evaporation pressure regulating valve 13 are in the operating state, the first on-off valve 66 is in the open state, and the second on-off valve 67 is in the closed state. In addition, the heating medium pump 16, the cooling medium pump 36 and the radiator 8 are in the operating state, and the heater core 17 is in the stopped state. On the other hand, the three-way flow regulating valve 35 and Figure 8 In the illustrated vehicle interior heating (extremely low temperature) mode, the heating medium H flows on the water-cooled condenser 5 side and flows in the tenth flow path 26 where the cooler 18 is arranged.

[0199] Thus, the refrigerant circuit 1 operates in the sixth mode. That is, both the refrigerant R flowing out of the evaporator 4 and the refrigerant R flowing out of the refrigerator 6 are introduced into the first compressor 10A, compressed by the first compressor 10A, and then further compressed by the second compressor 10B. Therefore, the compression efficiency of the refrigerant R in the refrigerant circuit 1 is improved, so the refrigeration and cooling capacity is improved.

[0200] Furthermore, since the first compressor 10A is a speed type, the refrigeration / cooling capacity can be improved while avoiding an increase in the size of the first compressor 10A.

[0201] In addition, in the heating medium circuit 2, the heating medium H that has been cooled by releasing heat to the outside air in the radiator 8 is introduced into the cooler 18. In the cooler 18, the heating medium H absorbs heat from the cooling target device through heat exchange between the heating medium H and the cooling target device. As a result, the cooling target device is cooled.

[0202] Other components and functions Fig.12 The illustrated in-cabin cooling battery cooling (strong) mode is the same.

[0203] (In-cabin dehumidification and heating (extremely low temperature, high heating demand) mode)

[0204] like Fig.17 As shown, in the cabin dehumidification and heating mode (extremely low temperature and large heating demand), in the refrigerant circuit 1, the first compressor 10A, the second compressor 10B, the first expansion valve 11, the second expansion valve 12, and the evaporation pressure regulating valve 13 are in operation, the first on-off valve 66 is in a closed state, and the second on-off valve 67 is in an open state. In addition, the heating medium pump 16, the cooling medium pump 36, the heater core 17, and the radiator 8 are in an operation state.

[0205] Thus, the refrigerant circuit 1 operates in the fourth mode. That is, the refrigerant R heated by the cooling medium L in the refrigerator 6 is introduced into the first compressor 10A. Then, the refrigerant R compressed by the first compressor 10A is further compressed by the second compressor 10B. Therefore, the compression efficiency of the refrigerant R in the refrigerant circuit 1 is improved, so the heating capacity is improved. In addition, in the evaporator 4, the indoor air releases heat to the refrigerant R through the heat exchange between the refrigerant R expanded by the first expansion valve 11 and the indoor air. As a result, the indoor air is dehumidified. The indoor air dehumidified by the refrigerant R is used for dehumidification in the vehicle cabin. The refrigerant R flowing out of the evaporator 4 is introduced into the second compressor 10B, and after being compressed by the second compressor 10B, it is introduced into the water-cooled condenser 5.

[0206] Other components and functions Figure 7 The same is true for the cabin heating (very low temperature) mode shown.

[0207] (In-cabin dehumidification and heating battery warm-up (extremely low temperature, high heating demand) mode)

[0208] exist Fig.17 In the cabin dehumidification and heating mode (extremely low temperature, large heating demand) shown in FIG. 1 , the valve groups in the heating medium circuit 2 and the cooling medium circuit 3 are in the second connection state. In contrast, Fig.18 As shown, in the vehicle interior dehumidification and heating battery warm-up mode (at extremely low temperatures and with high heating demand), the valves in the heating medium circuit 2 and the cooling medium circuit 3 are in the fourth connection state.

[0209] Thus, in the heating medium circuit 2, the heating medium H after heating the indoor air in the heater core 17 is introduced into the battery heat exchanger 7. In the battery heat exchanger 7, the vehicle battery absorbs heat from the heating medium H through heat exchange between the heating medium H and the vehicle battery. As a result, the vehicle battery is heated. In addition, in the refrigerant circuit 1, the operation is performed in the fourth mode.

[0210] Other components and functions Fig.17 The cabin dehumidification and heating (extremely low temperature, high heating demand) mode shown is the same.

[0211] (Cooling target equipment preheating mode)

[0212] like Fig.19 As shown, in the cooling target device preheating mode, the first compressor 10A, the second compressor 10B, the first expansion valve 11, the second expansion valve 12 and the evaporation pressure regulating valve 13 are in a stopped state. In addition, the heating medium pump 16 is in an operating state, and the cooling medium pump 36, the heater core 17 and the radiator 8 are in a stopped state. In addition, the valve components in the heating medium circuit 2 and the cooling medium circuit 3 are in the fifth connection state. In addition, the three-way flow regulating valve 35 is in a state where the heating medium H flows not on the water-cooled condenser 5 side but in the 10th flow path 26 where the cooler 18 is arranged.

[0213] Thus, in the heating medium circuit 2, the heating medium H pumped by the heating medium pump 16 flows in this order through the cooler 18 and the stopped heater core 17. In the cooler 18, the heating medium H and the cooling target device are heat-exchanged to equalize the temperatures of the cooling target devices and preheat the cooling target devices.

[0214] As described above, in the vehicle thermal management system of the first embodiment, in the refrigerant circuit 1, both heat release to the heating medium H in the water-cooled condenser 5 and heat absorption from the cooling medium L in the refrigerator 6 are performed.

[0215] The refrigerant R releases heat to the heating medium H in the water-cooled condenser 5, and the heating medium H heated by the refrigerant R releases heat to the interior air in the heater core 17 and to the vehicle battery in the battery heat exchanger 7. Thus, the vehicle cabin can be heated and the vehicle battery can be heated.

[0216] The refrigerant R absorbs heat from the cooling medium L in the refrigerator 6 , and the cooling medium L cooled by the refrigerant R absorbs heat from the vehicle-mounted battery in the battery heat exchanger 7 . Thus, the vehicle-mounted battery can be cooled.

[0217] In addition, the refrigerant R absorbs heat from the indoor air in the evaporator 4, thereby cooling the interior of the vehicle.

[0218] In the vehicle thermal management system, the refrigerant R compressed by the first compressor 10A can be further compressed by the second compressor 10B. This improves the compression efficiency of the refrigerant in the refrigerant circuit 1, thereby improving the heating and cooling capabilities for the interior air, the vehicle battery, etc.

[0219] Therefore, according to the vehicle thermal management system of the first embodiment, it is possible to heat the heating target or cool the cooling target, and the heating capacity or cooling capacity can be improved.

[0220] In addition, in the vehicle thermal management system, the second flow path 15A and the third flow path 14B are connected via the bypass flow path 63, and the first opening and closing valve 66 is provided in the bypass flow path 63. In addition, the second opening and closing valve 67 is provided in the second flow path 15A. Thus, by opening and closing control of the first opening and closing valve 66 and the second opening and closing valve 67, the refrigerant R flowing out of the evaporator 4 and the refrigerant R flowing out of the refrigerator 6 can be introduced into the first compressor 10A and introduced into the second compressor 10B. As a result, the action of the refrigerant R in the refrigerant circuit 1 can be switched between the first mode to the sixth mode, and the vehicle thermal management system can be operated in various operation modes.

[0221] Since the first compressor 10A is a speed type, it is possible to improve the cooling and heating capabilities in the vehicle cabin and the temperature control capabilities of the vehicle-mounted battery while avoiding the enlargement of the first compressor 10A. In addition, the oil separator 65 can suppress the lubricating oil in the second volumetric compressor 10B from flowing into the speed type first compressor 10A. In addition, the check valve 64 can prevent the refrigerant R from flowing back to the speed type first compressor 10A.

[0222] (Example 2)

[0223] Fig. 20 The vehicle heat management system of the second embodiment shown is based on the vehicle heat management system of the first embodiment, but the configuration of the refrigerant circuit 1 is changed.

[0224] The second on-off valve 67 is omitted from the refrigerant circuit 40 in the vehicle thermal management system of the second embodiment. The other configurations are the same as those of the vehicle thermal management system of the first embodiment.

[0225] The refrigerant circuit 40 does not operate in the sixth mode. Therefore, the vehicle thermal management system does not operate in the vehicle interior cooling battery cooling (strong) mode and the vehicle interior cooling battery cooling (strong+cooling target device cooling) mode.

[0226] The other structures and functions are the same as those of the vehicle thermal management system of the first embodiment.

[0227] As mentioned above, the present invention has been described based on the first and second embodiments. However, the present invention is not limited to the first and second embodiments, and can be applied with appropriate changes without departing from the gist of the present invention.

[0228] For example, in Examples 1 and 2, the flow of the heating medium H and the cooling medium L relative to the battery heat exchanger 7 and the radiator 8 is controlled by controlling the connection state of the valve groups in the heating medium circuit 2 and the cooling medium circuit 3, but the present invention is not limited to this, and the flow of the heating medium H and the cooling medium L relative to the battery heat exchanger 7 and the radiator 8 can also be controlled by appropriately combining various valve mechanisms.

[0229] (Note 1)

[0230] A thermal management system for a vehicle, characterized in that:

[0231] have:

[0232] a refrigerant circuit comprising a first compressor and a second compressor connected in series via a first flow path and compressing a refrigerant, a condenser into which the refrigerant compressed by the second compressor is introduced and which uses the refrigerant to release heat to a heating medium or outside air, a first expansion valve and a second expansion valve that expand the refrigerant after passing through the condenser, a first evaporator into which the refrigerant expanded by the first expansion valve is introduced and which uses the refrigerant to absorb heat from indoor air, and a second evaporator into which the refrigerant expanded by the second expansion valve is introduced and which uses the refrigerant to absorb heat from a cooling medium or outside air, the first evaporator being connected to the first flow path via a second flow path, and the second evaporator being connected to the first compressor via a third flow path; and

[0233] a medium circuit of at least one of a heating medium circuit and a cooling medium circuit, the heating medium circuit having a heating medium pump for circulating the heating medium and a heat radiator for radiating heat to a heating object using the heating medium, and the cooling medium circuit having a cooling medium pump for circulating the cooling medium and a heat absorber for absorbing heat from a cooling object using the cooling medium,

[0234] At least one of: using the refrigerant compressed by the second compressor to release heat to the heating medium in the condenser, and using the refrigerant expanded by the second expansion valve to absorb heat from the cooling medium in the second evaporator is performed.

[0235] (Note 2)

[0236] According to the vehicle thermal management system described in Appendix 1,

[0237] The second flow path is connected to the third flow path via a bypass flow path.

[0238] The bypass flow path is provided with a first on-off valve.

[0239] (Note 3)

[0240] According to the vehicle thermal management system described in Appendix 2,

[0241] It also has a control device.

[0242] The refrigerant circuit operates in a first mode, a second mode, a third mode, a fourth mode, and a fifth mode under the control of the control device.

[0243] In the first mode, the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the second compressor and then releases heat to the heating medium or the outdoor air in the condenser.

[0244] In the second mode, the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the first compressor and the second compressor, and then releases heat to the heating medium or the outside air in the condenser.

[0245] In the third mode, the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the second compressor and then releases heat to the heating medium or the outside air in the condenser.

[0246] In the fourth mode, the refrigerant that has absorbed heat from the indoor air in the first evaporator is compressed by the second compressor and then releases heat to the heating medium or the outdoor air in the condenser, and the refrigerant that has absorbed heat from the cooling medium or the outdoor air in the second evaporator is compressed by the first compressor and the second compressor and then releases heat to the heating medium or the outdoor air in the condenser.

[0247] In the fifth mode, after the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the second compressor, it releases heat to the heating medium or the outside air in the condenser, and after the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the second compressor, it releases heat to the heating medium or the outside air in the condenser.

[0248] (Note 4)

[0249] According to the vehicle thermal management system described in Appendix 3,

[0250] A second opening and closing valve is provided in the second flow path.

[0251] The second on-off valve is arranged on the downstream side of the refrigerant flow relative to the connection portion between the second flow path and the bypass flow path.

[0252] The refrigerant circuit operates in a sixth mode under the control of the control device.

[0253] In the sixth mode, after the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the first compressor and the second compressor, it releases heat to the heating medium or the outside air in the condenser, and after the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the first compressor and the second compressor, it releases heat to the heating medium or the outside air in the condenser.

[0254] (Note 5)

[0255] A thermal management system for a vehicle according to any one of Appendixes 1 to 4,

[0256] The condenser is a water-cooled condenser that performs heat exchange between a refrigerant and a heating medium.

[0257] (Note 6)

[0258] A thermal management system for a vehicle according to any one of Supplementary Notes 1 to 5,

[0259] The second evaporator is a refrigerator that performs heat exchange between a refrigerant and a cooling medium.

[0260] (Note 7)

[0261] A thermal management system for a vehicle according to any one of Supplementary Notes 1 to 6,

[0262] The first compressor is a speed type, and the second compressor is a volume type.

[0263] (Note 8)

[0264] According to the vehicle thermal management system described in Appendix 7,

[0265] A check valve is provided in the first flow path,

[0266] The check valve is arranged on an upstream side of a refrigerant flow relative to a connection portion between the first flow passage and the second flow passage.

[0267] (Note 9)

[0268] A thermal management system for a vehicle according to Appendix 7 or 8,

[0269] An oil separator is provided on the refrigerant discharge side of the second compressor to separate lubricating oil from the refrigerant compressed by the second compressor and return the lubricating oil to the refrigerant suction side of the second compressor.

[0270] Industrial Applicability

[0271] The vehicle thermal management system of the present invention can be suitably used in, for example, a battery-type battery vehicle.

[0272] Description of Reference Numerals

[0273] 1.40 Refrigerant circuit

[0274] 2 Heating medium circuit

[0275] 3 Cooling medium circuit

[0276] 4 Vaporizer (1st evaporator)

[0277] 5. Water-cooled condenser (condenser)

[0278] 6 Refrigerator (2nd evaporator)

[0279] 7Battery heat exchanger (heat emitter, heat absorber)

[0280] 8 Radiator (heat emitter, heat absorber)

[0281] 9. Control Device

[0282] 10A No. 1 compressor (compressor)

[0283] 10B 2nd compressor (compressor)

[0284] 111st expansion valve (expansion valve)

[0285] 12 2nd expansion valve (expansion valve)

[0286] 14A 1st flow path

[0287] 14B 3rd flow path

[0288] 15A 2nd flow path

[0289] 16 Heating medium pump

[0290] 17 Heater core (radiator)

[0291] 36 Cooling medium pump

[0292] 63 bypass flow path

[0293] 64 Check Valve

[0294] 65 Oil separator

[0295] 66 No.1 on-off valve

[0296] 67 2nd on-off valve

Claims

1. A thermal management system for a vehicle, characterized in that: have: a refrigerant circuit comprising a first compressor and a second compressor connected in series via a first flow path and compressing a refrigerant, a condenser into which the refrigerant compressed by the second compressor is introduced and which uses the refrigerant to release heat to a heating medium or outside air, a first expansion valve and a second expansion valve that expand the refrigerant after passing through the condenser, a first evaporator into which the refrigerant expanded by the first expansion valve is introduced and which uses the refrigerant to absorb heat from indoor air, and a second evaporator into which the refrigerant expanded by the second expansion valve is introduced and which uses the refrigerant to absorb heat from a cooling medium or outside air, the first evaporator being connected to the first flow path via a second flow path, and the second evaporator being connected to the first compressor via a third flow path; and a medium circuit of at least one of a heating medium circuit and a cooling medium circuit, the heating medium circuit having a heating medium pump for circulating the heating medium and a heat radiator for radiating heat to a heating object using the heating medium, and the cooling medium circuit having a cooling medium pump for circulating the cooling medium and a heat absorber for absorbing heat from a cooling object using the cooling medium, At least one of: using the refrigerant compressed by the second compressor to release heat to the heating medium in the condenser, and using the refrigerant expanded by the second expansion valve to absorb heat from the cooling medium in the second evaporator is performed.

2. The vehicle thermal management system according to claim 1, The second flow path is connected to the third flow path via a bypass flow path. The bypass flow path is provided with a first on-off valve.

3. The vehicle thermal management system according to claim 2, It also has a control device. The refrigerant circuit operates in a first mode, a second mode, a third mode, a fourth mode, and a fifth mode under the control of the control device. In the first mode, the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the second compressor and then releases heat to the heating medium or the outdoor air in the condenser. In the second mode, the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the first compressor and the second compressor, and then releases heat to the heating medium or the outside air in the condenser. In the third mode, the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the second compressor and then releases heat to the heating medium or the outside air in the condenser. In the fourth mode, the refrigerant that has absorbed heat from the indoor air in the first evaporator is compressed by the second compressor and then releases heat to the heating medium or the outdoor air in the condenser, and the refrigerant that has absorbed heat from the cooling medium or the outdoor air in the second evaporator is compressed by the first compressor and the second compressor and then releases heat to the heating medium or the outdoor air in the condenser. In the fifth mode, after the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the second compressor, it releases heat to the heating medium or the outside air in the condenser, and after the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the second compressor, it releases heat to the heating medium or the outside air in the condenser.

4. The vehicle thermal management system according to claim 3, A second opening and closing valve is provided in the second flow path. The second on-off valve is arranged on the downstream side of the refrigerant flow relative to the connection portion between the second flow path and the bypass flow path. The refrigerant circuit operates in a sixth mode under the control of the control device. In the sixth mode, after the refrigerant that absorbs heat from the indoor air in the first evaporator is compressed by the first compressor and the second compressor, it releases heat to the heating medium or the outside air in the condenser, and after the refrigerant that absorbs heat from the cooling medium or the outside air in the second evaporator is compressed by the first compressor and the second compressor, it releases heat to the heating medium or the outside air in the condenser.

5. The vehicle thermal management system according to any one of claims 1 to 4, The condenser is a water-cooled condenser that performs heat exchange between the refrigerant and the heating medium.

6. The vehicle thermal management system according to any one of claims 1 to 4, The second evaporator is a refrigerator that performs heat exchange between a refrigerant and the cooling medium.

7. The vehicle thermal management system according to any one of claims 1 to 4, The first compressor is a speed type, and the second compressor is a volume type.

8. The vehicle thermal management system according to claim 7, A check valve is provided in the first flow path, The check valve is arranged on an upstream side of a refrigerant flow relative to a connection portion between the first flow passage and the second flow passage.

9. The vehicle thermal management system according to claim 7, An oil separator is provided on the refrigerant discharge side of the second compressor to separate lubricating oil from the refrigerant compressed by the second compressor and return the lubricating oil to the refrigerant suction side of the second compressor.

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