A whole vehicle thermal management system and vehicle

Abstract

The present application provides a vehicle thermal management system and a vehicle; the system realizes dual-path cooling through an indoor heat exchanger and an outdoor heat exchanger, and uses an outdoor heat exchanger to improve the air-conditioning refrigeration performance, thereby solving the problem of slow cooling rate of the passenger compartment and affecting driving comfort due to the fact that only the indoor heat exchanger can be used and the indoor heat exchanger has low heat exchange efficiency under refrigeration conditions; and the present application realizes the reuse of liquid storage drying tanks and coaxial tubes in different circuits through an air-conditioning three-way valve, thereby reducing the number of system components and optimizing the layout of the whole vehicle.

Description

Technical Field

[0001] The present application relates to the field of air-conditioning technology, and in particular to a whole vehicle thermal management system and a vehicle. Background Art

[0002] The new energy vehicle market is developing rapidly, but the range is increasing slowly. At present, when facing the problem of battery heating, air conditioning heat pump heating is usually used to improve the heating energy efficiency ratio, thereby increasing the range.

[0003] The heat of traditional air source comes from the outdoor heat exchanger in the low temperature environment, and the heat in the low temperature air is "absorbed" by the refrigerant through heat exchange with the low temperature air. When the outdoor heat exchanger is frosted or frozen, it will affect the heat exchange effect, and then affect the working efficiency of the heat pump air conditioning system. Based on the above shortcomings, the dual heat source heat pump system came into being. At present, the heat pump system with waste heat recovery mostly absorbs the waste heat of the coolant of high-voltage electrical components, but under the refrigeration condition, only the indoor heat exchanger is used. Affected by the low heat exchange efficiency of the indoor heat exchanger, the cooling rate of the passenger compartment is slow, affecting the driving comfort. Summary of the invention

[0004] The present application provides a vehicle thermal management system and a vehicle to solve the problem in the prior art that the heat pump air-conditioning system only uses an indoor heat exchanger under cooling conditions, resulting in a slow cooling rate of the passenger compartment.

[0005] In a first aspect, the present application provides a vehicle thermal management system, which includes: an air conditioning system;

[0006] The air conditioning system comprises an outdoor heat exchanger refrigeration circuit and an indoor heat exchanger refrigeration circuit, wherein the outdoor heat exchanger refrigeration circuit comprises an outdoor heat exchanger refrigerant side refrigeration circuit; the indoor heat exchanger refrigeration circuit comprises an indoor heat exchanger refrigerant side refrigeration circuit;

[0007] The refrigeration circuit on the refrigerant side of the outdoor heat exchanger includes a compressor, an air conditioning three-way valve, an indoor heat exchanger, a liquid storage drying tank, a coaxial tube and an evaporator;

[0008] The refrigeration circuit on the refrigerant side of the indoor heat exchanger includes the compressor, the air conditioning three-way valve, the outdoor heat exchanger, the liquid storage drying tank, the coaxial tube and the heat exchange device;

[0009] The outlet of the compressor is connected to the indoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the evaporator, the low-pressure side of the coaxial tube, and the compressor inlet in sequence through the air conditioning three-way valve to form a refrigeration circuit on the refrigerant side of the indoor heat exchanger;

[0010] The outlet of the compressor is connected to the outdoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the evaporator, the low-pressure side of the coaxial tube, and the inlet of the compressor in sequence through the air-conditioning three-way valve to form a refrigeration circuit on the refrigerant side of the outdoor heat exchanger.

[0011] In a possible embodiment, the refrigeration circuit on the refrigerant side of the outdoor heat exchanger further includes an air conditioning four-way pipe; the refrigeration circuit on the refrigerant side of the indoor heat exchanger further includes the air conditioning four-way pipe;

[0012] In the refrigeration circuit on the refrigerant side of the indoor heat exchanger, the air conditioning cross-tube is connected between the high-pressure side of the coaxial tube and the evaporator;

[0013] In the refrigeration circuit on the refrigerant side of the outdoor heat exchanger, the air conditioning four-way pipe is connected between the high-pressure side of the coaxial pipe and the heat exchange device.

[0014] In a possible embodiment, the indoor heat exchanger refrigeration circuit further includes an indoor heat exchanger water-side refrigeration circuit;

[0015] The indoor heat exchanger water side refrigeration circuit includes a low temperature radiator, a first electronic water pump, the indoor heat exchanger and a first throttling element;

[0016] The outlet of the low-temperature radiator is connected to the first electronic water pump, the water side of the indoor heat exchanger, the first throttling element, and the inlet of the low-temperature radiator in sequence to form a refrigeration circuit on the water side of the indoor heat exchanger.

[0017] In a possible embodiment, the vehicle thermal management system further includes an electric drive system; the outdoor heat exchanger refrigeration circuit further includes an electric drive system cooling circuit;

[0018] The electric drive system cooling circuit includes a low-temperature radiator, a second throttling element and a second electronic water pump;

[0019] The outlet of the low-temperature radiator is connected to the second electronic water pump, the cold flow channel inside the electric drive system, the second throttling element, and the inlet of the low-temperature radiator in sequence to form a cooling circuit for the electric drive system.

[0020] In a possible embodiment, the heat exchange device includes the evaporator and a refrigerant heat exchanger;

[0021] When the heat exchange device is an evaporator, the refrigeration circuit on the refrigerant side of the outdoor heat exchanger is used to realize the passenger compartment refrigeration function;

[0022] When the heat exchange device is a refrigerant heat exchanger, the refrigerant side refrigeration circuit of the outdoor heat exchanger is also used to realize the power battery pack refrigeration function.

[0023] In a possible embodiment, the vehicle thermal management system further includes a power battery pack;

[0024] The outdoor heat exchanger refrigeration circuit also includes an outdoor heat exchanger water-side refrigeration circuit of the power battery pack;

[0025] The water-side refrigeration circuit of the outdoor heat exchanger of the power battery pack includes a third electronic water pump, a third throttling element and the refrigerant heat exchanger;

[0026] The outlet of the third electronic water pump is connected to the cold flow channel of the power battery pack, the third throttling element, the water side of the refrigerant heat exchanger, and the inlet of the third electronic water pump in sequence to form a refrigeration circuit on the water side of the outdoor heat exchanger of the power battery pack.

[0027] In a possible embodiment, the vehicle thermal management system further includes a heat pump system; the heat pump system includes a refrigerant-side heating circuit and a water-side heating circuit;

[0028] The refrigerant side heating circuit includes the compressor, the air conditioning three-way valve, the indoor heat exchanger, the liquid storage drying tank, the coaxial tube and the heat exchange device;

[0029] The water-side heating circuit includes a first electronic water pump, a first throttling element, the indoor heat exchanger, an auxiliary heat source and a warm air core;

[0030] The outlet of the compressor is connected to the refrigerant side of the indoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the heat exchange device, the low-pressure side of the coaxial tube, and the inlet of the compressor in sequence through the air conditioning three-way valve to form the refrigerant side heating circuit;

[0031] The first electronic water pump is connected in sequence to the water side of the indoor heat exchanger, the first throttling element, the auxiliary heat source, the heater core, and the inlet of the first electronic water pump to form the water side heating circuit.

[0032] In a possible embodiment, the heat exchange device includes an outdoor heat exchanger and a refrigerant heat exchanger;

[0033] When the heat exchange device is the outdoor heat exchanger, the refrigerant-side heating circuit is used to achieve a passenger compartment heating function;

[0034] When the heat exchange device is a refrigerant heat exchanger, the refrigerant side heating circuit is used to realize the power battery pack heating function.

[0035] In a possible embodiment, the vehicle thermal management system further includes an electric drive system; the heat pump system further includes an electric drive system cooling circuit;

[0036] The electric drive system cooling circuit includes a low-temperature radiator, a second throttling element and a second electronic water pump;

[0037] The outlet of the low-temperature radiator is connected to the second electronic water pump, the cold flow channel inside the electric drive system, the second throttling element, and the inlet of the low-temperature radiator in sequence to form a cooling circuit for the electric drive system.

[0038] In a possible embodiment, the heat exchange device is a refrigerant heat exchanger, the vehicle thermal management system further includes an electric drive system; the heat pump system further includes a motor cooling circuit;

[0039] The motor cooling circuit includes a second electronic water pump, a second throttling element, a refrigerant heat exchanger and a third throttling element;

[0040] The second electronic water pump is connected in sequence to the cold flow channel inside the electric drive system, the second throttling element, the third throttling element, the water side of the refrigerant heat exchanger, and the inlet of the second electronic water pump to form the motor cooling circuit.

[0041] In a possible embodiment, the vehicle thermal management system further includes a power battery pack;

[0042] The heat pump system also includes a power battery heating circuit;

[0043] The power battery heating circuit includes the first throttling element, the auxiliary heat source, the heater core and a third electronic water pump;

[0044] The outlet of the third electronic water pump is connected in sequence to the heat flow channel in the power battery pack, the first throttling element, the auxiliary heat source, the heater core, and the inlet of the third electronic water pump to form the power battery heating circuit.

[0045] In a possible embodiment, the heat exchange device includes a refrigerant heat exchanger; the heat pump system also includes a refrigerant-side defrosting circuit;

[0046] The outlet of the compressor is connected to the outdoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the refrigerant side of the refrigerant heat exchanger, the low-pressure side of the coaxial tube, and the inlet of the compressor in sequence through the air-conditioning three-way valve to form the refrigerant side defrost circuit.

[0047] In a second aspect, the present application provides a vehicle, which includes the vehicle thermal management system as described in the first aspect above.

[0048] An embodiment of the present application provides a whole vehicle thermal management system and a vehicle, which realizes dual-path cooling through an indoor heat exchanger and an outdoor heat exchanger, and uses an outdoor heat exchanger to improve the air-conditioning refrigeration performance, thereby solving the problem of slow cooling rate of the passenger compartment and affecting driving comfort due to the fact that only the indoor heat exchanger can be used and the indoor heat exchanger has low heat exchange efficiency under refrigeration conditions; and, the present application realizes the reuse of liquid storage drying tanks and coaxial tubes in different circuits through an air-conditioning three-way valve, thereby reducing the number of system components and optimizing the layout of the whole vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0050] Figure 1 It is a schematic diagram of the structure of the vehicle thermal management system provided by an embodiment of the present application;

[0051] Figure 2 is a flow chart for implementing a control method of a vehicle thermal management system provided in an embodiment of the present application;

[0052] Figure 1 The components of the vehicle thermal management system are as follows:

[0053] Low-temperature radiator 1; outdoor heat exchanger 2; cooling fan 3; overflow pipe check valve 4; overflow tank 5; first three-way pipe 6; overflow pipe check valve 7; second three-way pipe 8; second electronic water pump 9; three-in-one charger 10; motor controller 11; drive bridge 12; water temperature sensor 13; second three-way proportional valve 14; overflow pipe check valve 15; third three-way pipe 16; refrigerant heat exchanger 17; third three-way proportional valve 18; fourth three-way pipe 19; third electronic water pump 20; power battery pack 21; seventh three-way pipe 22; eighth three-way pipe 23; fifth three-way pipe 24; first electronic water pump 25; indoor heat exchanger 26; liquid storage Drying tank 27; Chiller outlet temperature sensor 28; first electronic expansion valve 29; first three-way proportional valve 30; outdoor heat exchanger outlet temperature sensor 31; air conditioning three-way valve 32; temperature and pressure sensor 33; air conditioning check valve 34; compressor 35; compressor inlet pressure sensor 36; compressor inlet temperature sensor 37; coaxial tube 38; air conditioning four-way pipe 39; second electronic expansion valve 40; stop valve 41; air conditioning check valve 42; electromagnetic expansion valve 43; auxiliary heat source 44; HVAC air conditioning system 45; blower 46; evaporator 47; heater core 48; sixth three-way pipe 49. DETAILED DESCRIPTION

[0054] In the following description, specific details such as specific system structures, technologies, etc. are provided for the purpose of illustration rather than limitation, so as to provide a thorough understanding of the embodiments of the present application. However, it should be clear to those skilled in the art that the present application may also be implemented in other embodiments without these specific details. In other cases, detailed descriptions of well-known systems, devices, circuits, and methods are omitted to prevent unnecessary details from obstructing the description of the present application.

[0055] In order to make the purpose, technical solutions and advantages of the present application clearer, specific embodiments will be described below in conjunction with the accompanying drawings.

[0056] Figure 1 A schematic diagram of the structural connection of a vehicle thermal management system provided in an embodiment of the present application includes: the air conditioning system includes an outdoor heat exchanger refrigeration circuit and an indoor heat exchanger refrigeration circuit, the outdoor heat exchanger refrigeration circuit includes an outdoor heat exchanger refrigerant side refrigeration circuit; the indoor heat exchanger refrigeration circuit includes an indoor heat exchanger refrigerant side refrigeration circuit;

[0057] The refrigeration circuit on the refrigerant side of the outdoor heat exchanger includes a compressor 35, an air conditioning three-way valve 32, an indoor heat exchanger 26, a liquid storage drying tank 27, a coaxial tube 38 and an evaporator 47;

[0058] The refrigeration circuit on the refrigerant side of the indoor heat exchanger includes the compressor 35, the air conditioning three-way valve 32, the outdoor heat exchanger 2, the liquid storage drying tank 27, the coaxial tube 38 and the heat exchange device;

[0059] The outlet of the compressor 35 is connected to the indoor heat exchanger 26, the liquid storage drying tank 27, the high-pressure side of the coaxial tube 38, the evaporator 47, the low-pressure side of the coaxial tube 38, and the inlet of the compressor 35 in sequence through the air conditioning three-way valve 32 to form a refrigeration circuit on the refrigerant side of the indoor heat exchanger;

[0060] The outlet of the compressor 35 is connected to the outdoor heat exchanger 2, the liquid storage drying tank 27, the high-pressure side of the coaxial tube 38, the evaporator 47, the low-pressure side of the coaxial tube 38, and the inlet of the compressor 35 in sequence through the air-conditioning three-way valve 32 to form a refrigeration circuit on the refrigerant side of the outdoor heat exchanger.

[0061] Specifically, in the refrigeration circuit on the refrigerant side of the indoor heat exchanger, the outlet of the compressor 35 is connected to the refrigerant side inlet of the indoor heat exchanger 26 through the air conditioning three-way valve 32, the refrigerant side outlet of the indoor heat exchanger 26 is connected to the inlet of the liquid storage drying tank 27, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the inlet of the heat exchange device, the outlet of the heat exchange device is connected to the low-pressure side inlet of the coaxial tube 38, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35;

[0062] In the refrigeration circuit on the refrigerant side of the outdoor heat exchanger, the outlet of the compressor 35 is connected to the inlet of the outdoor heat exchanger 2 through the air-conditioning three-way valve 32, the outlet of the outdoor heat exchanger 2 is connected to the inlet of the liquid storage drying tank 27, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the inlet of the heat exchange device, the outlet of the heat exchange device is connected to the low-pressure side inlet of the coaxial tube 38, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35.

[0063] In a possible embodiment, the refrigeration circuit on the refrigerant side of the outdoor heat exchanger further includes an air conditioning four-way pipe; the refrigeration circuit on the refrigerant side of the indoor heat exchanger further includes the air conditioning four-way pipe 39;

[0064] In the refrigeration circuit on the refrigerant side of the indoor heat exchanger, the air conditioning cross-tube 39 is connected between the high-pressure side of the coaxial tube 38 and the evaporator 47;

[0065] In the refrigeration circuit on the refrigerant side of the outdoor heat exchanger, the air conditioning cross-tube 39 is connected between the high-pressure side of the coaxial tube 38 and the heat exchange device.

[0066] In a possible embodiment, the indoor heat exchanger refrigeration circuit further includes an indoor heat exchanger water-side refrigeration circuit;

[0067] The indoor heat exchanger water side refrigeration circuit includes a low temperature radiator 1, a first electronic water pump 25, the indoor heat exchanger 26 and a first throttling element;

[0068] The outlet of the low-temperature radiator 1 is connected to the first electronic water pump 25, the water side of the indoor heat exchanger 26, the first throttling element, and the inlet of the low-temperature radiator 1 in sequence to form a refrigeration circuit on the water side of the indoor heat exchanger.

[0069] Specifically, in the water-side refrigeration circuit of the indoor heat exchanger, the outlet of the low-temperature radiator 1 is connected to the inlet of the first electronic water pump 25, the outlet of the first electronic water pump 25 is connected to the water-side inlet of the indoor heat exchanger 26, the water-side outlet of the indoor heat exchanger 26 is connected to the third port of the first throttling element, and the second port of the first throttling element is connected to the inlet of the low-temperature radiator 1.

[0070] In a possible embodiment, the vehicle thermal management system further includes an electric drive system; the outdoor heat exchanger refrigeration circuit further includes an electric drive system cooling circuit;

[0071] The electric drive system cooling circuit includes a low-temperature radiator 1, a second throttling element and a second electronic water pump 9;

[0072] The outlet of the low-temperature radiator 1 is connected to the second electronic water pump 9, the cold flow channel inside the electric drive system, the second throttling element, and the inlet of the low-temperature radiator 1 in sequence to form the electric drive system cooling circuit.

[0073] Specifically, in the cooling circuit of the electric drive system, the outlet of the low-temperature radiator 1 is connected to the inlet of the second electronic water pump 9, the outlet of the second electronic water pump 9 is connected to the third port of the second throttling element through the cold flow channel inside the electric drive system, and the second port of the second throttling element is connected to the inlet of the low-temperature radiator 1;

[0074] The first port of the second throttling element is connected to the second port of the first throttling element.

[0075] In a possible embodiment, the heat exchange device includes the evaporator 47 and the refrigerant heat exchanger 17;

[0076] When the heat exchange device is an evaporator 47, the refrigeration circuit on the refrigerant side of the outdoor heat exchanger is used to realize the cooling function of the passenger compartment; when the heat exchange device is a refrigerant heat exchanger 17, the refrigeration circuit on the refrigerant side of the outdoor heat exchanger is also used to realize the cooling function of the power battery pack.

[0077] In a possible embodiment, the vehicle thermal management system further includes a power battery pack 21;

[0078] The outdoor heat exchanger refrigeration circuit also includes an outdoor heat exchanger water-side refrigeration circuit of the power battery pack 21;

[0079] The water-side refrigeration circuit of the outdoor heat exchanger of the power battery pack 21 includes a third electronic water pump, a third throttling element and the refrigerant heat exchanger 17;

[0080] The outlet of the third electronic water pump is connected to the cold flow channel of the power battery pack 21, the third throttling element, the water side of the refrigerant heat exchanger 17, and the inlet of the third electronic water pump in sequence to form a refrigeration circuit on the water side of the outdoor heat exchanger of the power battery pack 21.

[0081] Specifically, in the water-side refrigeration circuit of the outdoor heat exchanger of the power battery pack 21, the outlet of the third electronic water pump 20 is connected to the first port of the third throttling element through the cold flow channel of the power battery pack 21, the third port of the third throttling element is connected to the water-side inlet of the refrigerant heat exchanger 17, and the water-side outlet of the refrigerant heat exchanger 17 is connected to the inlet of the third electronic water pump 20; wherein, the second port of the third throttling element is connected to the inlet of the low-temperature radiator 1.

[0082] In a possible embodiment, the vehicle thermal management system further includes a heat pump system; the heat pump system includes a refrigerant-side heating circuit and a water-side heating circuit;

[0083] The refrigerant side heating circuit includes the compressor 35, the air conditioning three-way valve 32, the indoor heat exchanger 26, the liquid storage drying tank 27, the coaxial tube 38 and the heat exchange device;

[0084] The water-side heating circuit includes a first electronic water pump 25, a first throttling element, the indoor heat exchanger 26, an auxiliary heat source 44 and a warm air core;

[0085] The outlet of the compressor 35 is connected to the refrigerant side of the indoor heat exchanger 26, the liquid storage drying tank 27, the high-pressure side of the coaxial tube 38, the heat exchange device, the low-pressure side of the coaxial tube 38, and the inlet of the compressor 35 in sequence through the air conditioning three-way valve 32 to form the refrigerant side heating circuit;

[0086] The first electronic water pump 25 is connected in sequence to the water side of the indoor heat exchanger 26, the first throttling element, the auxiliary heat source 44, the warm air core 48, and the inlet of the first electronic water pump 25 to form the water-side heating circuit.

[0087] Specifically, in the refrigerant-side heating circuit, the outlet of the compressor 35 is connected to the refrigerant-side inlet of the indoor heat exchanger 26 through the air-conditioning three-way valve 32, the refrigerant-side outlet of the indoor heat exchanger 26 is connected to the inlet of the liquid storage drying tank 27, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the inlet of the heat exchange device, the outlet of the heat exchange device is connected to the low-pressure side inlet of the coaxial tube 38, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35;

[0088] In the water-side heating circuit, the outlet of the first electronic water pump 25 is connected to the water-side inlet of the indoor heat exchanger 26, the water-side outlet of the indoor heat exchanger 26 is connected to the third port of the first throttling element, the first port of the first throttling element is connected to the inlet of the auxiliary heat source 44, the outlet of the auxiliary heat source 44 is connected to the inlet of the warm air core 48, and the outlet of the warm air core 48 is connected to the inlet of the first electronic water pump 25.

[0089] In a possible embodiment, the heat exchange device includes an outdoor heat exchanger 2 and a refrigerant heat exchanger 17;

[0090] When the heat exchange device is the outdoor heat exchanger 2, the refrigerant side heating circuit is used to realize the passenger compartment heating function;

[0091] When the heat exchange device is a refrigerant heat exchanger 17, the refrigerant side heating circuit is used to realize the power battery pack heating function.

[0092] In a possible embodiment, the vehicle thermal management system further includes an electric drive system; the heat pump system further includes an electric drive system cooling circuit;

[0093] The electric drive system cooling circuit includes a low-temperature radiator 1, a second throttling element and a second electronic water pump 9;

[0094] The outlet of the low-temperature radiator 1 is connected to the second electronic water pump 9, the cold flow channel inside the electric drive system, the second throttling element, and the inlet of the low-temperature radiator 1 in sequence to form the electric drive system cooling circuit.

[0095] Specifically, in the cooling circuit of the electric drive system, the outlet of the low-temperature radiator 1 is connected to the inlet of the second electronic water pump 9, the outlet of the second electronic water pump 9 is connected to the third port of the second throttling element through the cold flow channel inside the electric drive system, and the second port of the second throttling element is connected to the inlet of the low-temperature radiator 1.

[0096] In a possible embodiment, the heat exchange device is a refrigerant heat exchanger 17, the vehicle thermal management system further includes an electric drive system; the heat pump system further includes a motor cooling circuit;

[0097] The motor cooling circuit includes a second electronic water pump 9, a second throttling element, a refrigerant heat exchanger 17 and a third throttling element;

[0098] The second electronic water pump 9 is connected in sequence with the cold flow channel inside the electric drive system, the second throttling element, the third throttling element, the water side of the refrigerant heat exchanger 17, and the inlet of the second electronic water pump 9 to form the motor cooling circuit.

[0099] Specifically, in the motor cooling circuit, the outlet of the second electronic water pump 9 is connected to the third port of the second throttling element through the cold flow channel inside the electric drive system, the first port of the second throttling element is connected to the second port of the third throttling element, the third port of the third throttling element is connected to the water side inlet of the refrigerant heat exchanger 17, and the water side outlet of the refrigerant heat exchanger 17 is connected to the inlet of the second electronic water pump 9;

[0100] The first port of the third throttling element is connected to the second port of the first throttling element.

[0101] In a possible embodiment, the heat pump system further includes a power battery heating circuit;

[0102] The power battery heating circuit includes the first throttling element, the auxiliary heat source 44, the heater core 48 and the third electronic water pump 20;

[0103] The outlet of the third electronic water pump 20 is connected in sequence to the heat flow channel in the power battery pack 21, the first throttling element, the auxiliary heat source 44, the heater core 48, and the inlet of the third electronic water pump 20 to form the power battery heating circuit.

[0104] Specifically, in the power battery heating circuit, the outlet of the third electronic water pump 20 flows through the heat flow channel in the power battery pack 21 and is connected to the second port of the first throttling element, the first port of the first throttling element is connected to the inlet of the auxiliary heat source 44, the outlet of the auxiliary heat source 44 is connected to the inlet of the heater core 48, and the outlet of the heater core 48 is connected to the inlet of the third electronic water pump 20.

[0105] In a possible embodiment, the heat exchange device includes a refrigerant heat exchanger 17; the heat pump system also includes a refrigerant side defrosting circuit;

[0106] The outlet of the compressor 35 is connected to the outdoor heat exchanger 2, the liquid storage drying tank 27, the high-pressure side of the coaxial tube 38, the refrigerant side of the refrigerant heat exchanger 17, the low-pressure side of the coaxial tube 38, and the inlet of the compressor 35 in sequence through the air-conditioning three-way valve 32 to form the refrigerant side defrosting circuit.

[0107] Specifically, in the refrigerant side defrost circuit, the outlet of the compressor 35 is connected to the inlet of the outdoor heat exchanger 2 through the air-conditioning three-way valve 32, the outlet of the outdoor heat exchanger 2 is connected to the inlet of the liquid storage drying tank 27, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the refrigerant side inlet of the refrigerant heat exchanger 17, the refrigerant side outlet of the refrigerant heat exchanger 17 is connected to the low-pressure side inlet of the coaxial tube 38, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35.

[0108] In a possible embodiment, the vehicle thermal management system further includes a second three-way pipe 8, a third three-way pipe 16, a fourth three-way pipe 19 and a fifth three-way pipe 24;

[0109] The first port of the second three-way pipe 8 is connected to the outlet of the low-pressure radiator, the second port of the second three-way pipe 8 is connected to the first port of the third three-way pipe 16, the third port of the second three-way pipe 8 is connected to the inlet of the second electronic water pump 9, the second port of the third three-way pipe 16 is connected to the first port of the fourth three-way pipe 19, the third port of the third three-way pipe 16 is connected to the water side outlet of the refrigerant heat exchanger 17, the second port of the fourth three-way pipe 19 is connected to the first port of the fifth three-way pipe 24, the third port of the fourth three-way pipe 19 is connected to the inlet of the third electronic water pump 20, the second port of the fifth three-way pipe 24 is connected to the outlet of the auxiliary heat source 44, and the third port of the fifth three-way pipe 24 is connected to the inlet of the first electronic water pump 25.

[0110] Specifically, the first throttling element is the first three-way proportional valve 30 , the second throttling element is the second three-way proportional valve 14 , and the third throttling element is the third three-way proportional valve 18 .

[0111] It can be seen from the above embodiments that the vehicle thermal management system provided in this embodiment realizes dual-path cooling through the indoor heat exchanger 26 and the outdoor heat exchanger 2, and uses the outdoor heat exchanger 2 to improve the air-conditioning refrigeration performance, thereby solving the problem of slow cooling rate of the passenger compartment and affecting driving comfort due to the fact that only the indoor heat exchanger 26 can be used and the indoor heat exchanger 26 has low heat exchange efficiency under refrigeration conditions; and, the present application realizes switching of the dual-path air-conditioning circulation loop through the air-conditioning three-way valve 32, thereby reducing the number of system components and optimizing the layout of the vehicle.

[0112] In a second aspect, the present application provides a vehicle comprising the vehicle thermal management system as described above.

[0113] like Figure 2 As shown, a control method of a vehicle thermal management system is shown, which is applied to the vehicle thermal management system as described above, and is described in detail as follows:

[0114] S101: If the vehicle has a cooling demand, the outdoor heat exchanger cooling circuit or the indoor heat exchanger cooling circuit is controlled to operate;

[0115] S102: If the vehicle has a heating demand, the refrigerant-side heating circuit and the water-side heating circuit are controlled to operate.

[0116] Specifically, through control Figure 1 The vehicle thermal management system structure can realize multiple functional modes, which are described in detail as follows:

[0117] 1. Air conditioning and cooling function mode of indoor heat exchanger 26

[0118] In a possible embodiment, S101 specifically includes:

[0119] If there is a cooling demand for the passenger compartment of the vehicle, the operation of the refrigerant side refrigeration circuit of the indoor heat exchanger and the water side refrigeration circuit of the indoor heat exchanger are controlled;

[0120] Among them, the heat exchange device in the refrigeration circuit on the refrigerant side of the indoor heat exchanger is an evaporator 47.

[0121] Specifically, Figure 1 As shown, the vehicle thermal management system can use the indoor heat exchanger 26 to achieve air conditioning and refrigeration; specifically, it includes a refrigeration circuit on the refrigerant side of the indoor heat exchanger and a refrigeration circuit on the water side of the indoor heat exchanger.

[0122] Specifically, in the refrigeration circuit on the refrigerant side of the indoor heat exchanger, the outlet of the compressor 35 is connected to the first valve port a of the air conditioning three-way valve 32, the third valve port c of the air conditioning three-way valve 32 is connected to the refrigerant side inlet of the indoor heat exchanger 26, the refrigerant side outlet of the indoor heat exchanger 26 is connected to the inlet of the liquid storage drying tank 27, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the first port of the air conditioning four-way tube 39, the second port of the air conditioning four-way tube 39 is connected to the inlet of the evaporator 47 through the electromagnetic expansion valve 43, the outlet of the evaporator 47 is connected to the low-pressure side inlet of the coaxial tube 38 through the air conditioning one-way valve 42, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35. Among them, the temperature and pressure sensor 33 is installed in the pipeline between the compressor 35 and the air conditioning three-way valve 32; the compressor inlet pressure sensor 36 and the compressor inlet temperature sensor 37 are installed in the pipeline between the low-pressure side outlet of the coaxial tube 38 and the inlet of the compressor 35.

[0123] In the water-side refrigeration circuit of the indoor heat exchanger, the outlet of the low-temperature radiator 1 is connected to the inlet of the first electronic water pump 25 through the first three-way pipe 6, the second three-way pipe 8, the third three-way pipe 16, the fourth three-way pipe 19 and the fifth three-way pipe 24 in sequence, the outlet of the first electronic water pump 25 is connected to the water-side inlet of the indoor heat exchanger 26, the water-side outlet of the indoor heat exchanger 26 is connected to the third port of the first three-way proportional valve 30 through the sixth three-way pipe 49, the second port of the first three-way proportional valve 30 and the second port of the first three-way proportional valve 30 are connected to the first port of the third three-way proportional valve 18 through the eighth three-way pipe 23, the third port of the third three-way proportional valve 18 is connected to the third port of the second three-way proportional valve 14, and the second port of the second three-way proportional valve 14 is connected to the inlet of the low-temperature radiator 1.

[0124] In this embodiment, when there is a cooling request for the passenger compartment, the air-conditioning controller sends the cooling request to the vehicle controller. After the vehicle controller and the air-conditioning controller each determine that the vehicle thermal management system meets the corresponding conditions, they turn on the air-conditioning system to realize the cooling function of the passenger compartment.

[0125] Specifically, the vehicle controller needs to determine whether the vehicle thermal management system meets the following conditions:

[0126] 1. Receive cooling request from air conditioning system; 2. The second three-way proportional valve 14 and the third three-way proportional valve 18 complete self-test and have no faults and feedback to the air conditioning controller; 3. The power battery pack 21 has no active cooling demand; 4. The power battery pack 21 has no temperature equalization demand; 5. No waste heat recovery request signal sent by the air conditioning controller is received; 6. The inlet water temperature of the power battery pack 21 is lower than T1°C. Among them, the active cooling mode means that the refrigerant heat exchanger (Chiller) 17 is used to cool the battery pack, and the temperature equalization mode means that the power battery pack 21 forms a circulation loop for operation.

[0127] Specifically, the air conditioning controller needs to determine whether the vehicle thermal management system meets the following conditions:

[0128] 1. The air conditioning three-way valve 32 has no fault or the air conditioning three-way valve 32 has a fault but the first valve port a and the third valve port c can be connected; 2. The compressor 35 has no fault; 3. The electromagnetic expansion valve 43, the first electronic expansion valve 29, the second electronic expansion valve 40, the air conditioning stop valve 41 and the first three-way proportional valve 30 have no fault; 4. The temperature and pressure sensor 33, the compressor inlet pressure sensor 36 and the compressor inlet temperature sensor 37 have no fault; 5. The first electronic water pump 25 has no fault; 6. The blower 46 has no fault.

[0129] When the vehicle controller determines that all the corresponding conditions are met, and the air conditioning controller determines that all the corresponding conditions are met, the following operations are performed;

[0130] 1. The vehicle controller controls the first valve port a, the second valve port b and the third valve port c of the second three-way proportional valve 14 to be opened;

[0131] 2. The vehicle controller controls the first valve port a and the second valve port b of the third three-way proportional valve 18 to be opened, and the third valve port c to be closed;

[0132] 3. The air conditioning controller controls the second valve port b and the third valve port c of the first three-way proportional valve 30 to be opened, and the first valve port a to be closed;

[0133] 4. The air conditioning controller controls the first electronic water pump 25 to run at a speed of n1;

[0134] 5. The air conditioning controller controls the air conditioning compressor 35 to run at a corresponding speed according to the cooling demand of the passenger compartment;

[0135] 6. The air conditioning controller controls the electromagnetic expansion valve 43 to open;

[0136] 7. The air conditioning controller controls the air conditioning stop valve 41, the first electronic expansion valve 29, and the second electronic expansion valve 40 to close;

[0137] 8. The air conditioning controller controls the operation of the blower 46 according to the blower 46 gear position selected by the passenger or according to the blower 46 gear position calculated by the automatic air conditioning.

[0138] When any of the conditions determined by the vehicle controller and the air conditioning controller are not met, the air conditioning and cooling function of the indoor heat exchanger is exited. During the operation of this functional mode, when the high pressure is higher than P2 Mpa or the low pressure is lower than P1 Mpa, the air conditioning compressor 35 is controlled to stop running and the air conditioning and cooling mode of the indoor heat exchanger is exited. The vehicle controller controls the opening of the second three-way proportional valve 14 and the third three-way proportional valve 18 according to the cooling requirements of the electric drive system and the battery system on the vehicle.

[0139] Furthermore, the air conditioning refrigeration mode of the indoor heat exchanger is used as an auxiliary way of the air conditioning refrigeration function of the whole vehicle. This mode can be enabled when the air conditioning three-way valve 32 fails but the first valve port a and the third valve port c are connected.

[0140] 2. Passenger compartment air conditioning single cooling function mode of outdoor heat exchanger 2

[0141] In a possible embodiment, S101 specifically includes:

[0142] If there is a cooling demand for the passenger compartment of the vehicle, the refrigeration circuit on the refrigerant side of the outdoor heat exchanger and the cooling circuit of the electric drive system are controlled to operate; wherein the heat exchange device in the refrigeration circuit on the refrigerant side of the outdoor heat exchanger is an evaporator 47 .

[0143] In one embodiment of the present application, the vehicle thermal management system can also use the outdoor heat exchanger 2 to achieve passenger compartment air conditioning cooling only. This functional mode includes the outdoor heat exchanger refrigerant side refrigeration circuit and the electric drive system cooling circuit.

[0144] Specifically, in the refrigeration circuit on the refrigerant side of the outdoor heat exchanger, the outlet of the compressor 35 is connected to the inlet of the outdoor heat exchanger 2 through the first valve port a and the second valve port b of the air conditioning three-way valve 32, the outlet of the outdoor heat exchanger 2 is connected to the inlet of the liquid storage drying tank 27 through the air conditioning one-way valve 34, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the first port of the air conditioning four-way tube 39, the second port of the air conditioning four-way tube 39 is connected to the inlet of the evaporator 47 through the electromagnetic expansion valve 43, the outlet of the evaporator 47 is connected to the low-pressure side inlet of the coaxial tube 38 through the air conditioning one-way valve 42, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35. Among them, the outlet of the outdoor heat exchanger 2 is installed with an outdoor heat exchanger outlet temperature sensor 31; the inlet of the compressor 35 is installed with a compressor inlet temperature sensor 37 and a compressor inlet pressure sensor 36.

[0145] In the cooling circuit of the electric drive system, the outlet of the low-temperature radiator 1 is connected to the inlet of the second electronic water pump 9 through the first three-way pipe 6 and the second three-way pipe 8, and the outlet of the second electronic water pump 9 is connected to the third valve port c of the second three-way proportional valve 14 through the cold flow channel inside the electric drive system, and the second valve port b of the second three-way proportional valve 14 is connected to the inlet of the low-temperature radiator 1. A water temperature sensor 13 is provided at the outlet of the cold flow channel of the electric drive system. The electric drive system may include a three-in-one charger 10, a motor controller 11 and a drive bridge 12.

[0146] In this embodiment, when the passenger compartment has a cooling demand and the power battery pack 21 has no active cooling demand, the air conditioning controller determines the following conditions and enters the air conditioning system cooling function if there is no problem:

[0147] 1. The passenger compartment has a cooling demand; 2. The battery pack has no active cooling demand; 3. The air conditioning three-way valve 32 has completed self-test and has no faults; 4. The compressor 35 has no faults; 5. The electromagnetic expansion valve 43 has no faults; 6. The blower 46 has no faults; 7. The first electronic expansion valve 29, the second electronic expansion valve 40, and the air conditioning stop valve 41 have no faults; 8. The temperature and pressure sensor 33, the compressor inlet pressure sensor 36, the compressor inlet temperature sensor 37, and the outdoor heat exchanger outlet temperature sensor 31 have no faults;

[0148] After all the above conditions are met, perform the following operations to enter the function, otherwise no action will be taken:

[0149] 1. Control the air conditioning three-way valve 32 to open the first valve port a and the second valve port b;

[0150] 2. The air conditioning controller controls the air conditioning compressor 35 to operate at different speeds according to the cooling requirements of the passenger compartment;

[0151] 3. The air conditioning controller controls the electromagnetic expansion valve 43 to open;

[0152] 4. The air conditioning controller controls the air conditioning stop valve 41, the first electronic expansion valve 29, and the second electronic expansion valve 40 to close;

[0153] 5. The air conditioning controller controls the operation of the blower 46 according to the blower 46 gear position selected by the passenger or according to the blower 46 gear position calculated by the automatic air conditioning;

[0154] Specifically, the passenger compartment air conditioning single cooling mode of the outdoor heat exchanger 2 is the preferred cooling method for cooling the air conditioning system. This method can improve the air conditioning cooling performance, the passenger compartment cooling rate is fast, and driving comfort is improved because the outdoor heat exchanger 2 has a higher heat exchange efficiency than the indoor heat exchanger 26.

[0155] 3. Dual cooling function mode of passenger compartment and power battery pack 21 of outdoor heat exchanger 2

[0156] In one embodiment of the present application, the specific implementation process of S101 includes:

[0157] If the passenger compartment of the vehicle has a cooling demand and the power battery pack 21 of the vehicle has a cooling demand, the outdoor heat exchanger refrigerant side refrigeration circuit whose heat exchange device is the evaporator 47, the outdoor heat exchanger refrigerant side refrigeration circuit whose heat exchange device is the refrigerant heat exchanger 17 and the outdoor heat exchanger water side refrigeration circuit are controlled to operate, and the electric drive cooling circuit is controlled to operate at the same time.

[0158] Specifically, the vehicle thermal management system can also use the outdoor heat exchanger 2 to achieve dual cooling functions for the passenger compartment and the power battery pack 21. This functional mode includes the outdoor heat exchanger refrigerant side refrigeration circuit of the passenger compartment, the outdoor heat exchanger refrigerant side refrigeration circuit of the power battery pack 21, and the outdoor heat exchanger water side refrigeration circuit.

[0159] In the refrigeration circuit of the outdoor heat exchanger in the passenger compartment, the heat exchange device is an evaporator 47, that is, the outlet of the compressor 35 is connected to the inlet of the outdoor heat exchanger 2 through the first valve port a and the second valve port b of the air conditioning three-way valve 32, the outlet of the outdoor heat exchanger 2 is connected to the inlet of the liquid storage and drying tank 27 through the air conditioning check valve 34, the outlet of the liquid storage and drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the first port of the air conditioning four-way tube 39, the second port of the air conditioning four-way tube 39 is connected to the inlet of the evaporator 47 through the electromagnetic expansion valve 43, the outlet of the evaporator 47 is connected to the low-pressure side inlet of the coaxial tube 38 through the air conditioning check valve 42, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35. The outlet of the outdoor heat exchanger 2 is installed with an outdoor heat exchanger outlet temperature sensor 31; the inlet of the compressor 35 is installed with a compressor inlet temperature sensor 37 and a compressor inlet pressure sensor 36.

[0160] In the refrigeration circuit on the refrigerant side of the outdoor heat exchanger of the power battery pack 21, the heat exchange device is a refrigerant heat exchanger (Chiller) 17, that is: the outlet of the compressor 35 is connected to the inlet of the outdoor heat exchanger 2 through the first valve port a and the second valve port b of the air-conditioning three-way valve 32, the outlet of the outdoor heat exchanger 2 is connected to the inlet of the liquid storage drying tank 27 through the air-conditioning one-way valve 34, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the first port of the air-conditioning four-way tube 39, the fourth port of the air-conditioning four-way tube 39 is connected to the refrigerant side inlet of the refrigerant heat exchanger 17 through the first electronic expansion valve 29, the refrigerant side outlet of the refrigerant heat exchanger 17 is connected to the low-pressure side inlet of the coaxial tube 38, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35. Among them, an outdoor heat exchanger outlet temperature sensor 31 is installed at the outlet of the outdoor heat exchanger 2; a compressor inlet temperature sensor 37 and a compressor inlet pressure sensor 36 are installed at the low-pressure side outlet of the coaxial tube 38; and a Chiller outlet temperature sensor 28 is installed at the refrigerant side outlet of the refrigerant heat exchanger 17.

[0161] In the water-side refrigeration circuit of the outdoor heat exchanger of the power battery pack 21, the outlet of the third electronic water pump 20 is connected to the first valve port a of the third three-way proportional valve 18 through the cold flow channel of the power battery pack 21, the seventh three-way pipe 22, and the eighth three-way pipe 23, and the second valve port b of the third three-way proportional valve 18 is connected to the water-side inlet of the refrigerant heat exchanger 17, and the water-side outlet of the refrigerant heat exchanger 17 is connected to the inlet of the third electronic water pump 20 through the third three-way pipe 16 and the fourth three-way pipe 19.

[0162] In this embodiment, the vehicle thermal management system uses the outdoor heat exchanger 2 to realize the dual cooling functions of the passenger compartment and the power battery pack 21, and can also realize the cooling of the electric drive system through the electric drive system cooling circuit; the details are as follows:

[0163] In the cooling circuit of the electric drive system, the outlet of the low-temperature radiator 1 is connected to the inlet of the second electronic water pump 9 through the first three-way pipe 6 and the second three-way pipe 8, the outlet of the second electronic water pump 9 is connected to the first valve port a of the second three-way proportional valve 14 through the cold flow channel inside the electric drive system, and the second valve port b of the second three-way proportional valve 14 is connected to the inlet of the low-temperature radiator 1.

[0164] In this embodiment, when the passenger compartment has a cooling demand and the power battery pack 21 has an active cooling demand, the air conditioning controller determines the following conditions and can enter the dual cooling function of the passenger compartment and the power battery pack 21 if there is no problem:

[0165] 1. The passenger compartment has a cooling demand; 2. The battery pack has an active cooling demand; 3. The air conditioning three-way valve 32 has completed self-inspection and has no faults; 4. The compressor 35 has no faults; 5. The electromagnetic expansion valve 43, the first electronic expansion valve 29, the second electronic expansion valve 40, and the stop valve 41 have no faults; 6. The third electronic water pump 20 has no faults; 7. The third three-way proportional valve 18 and the first three-way proportional valve 30 have no faults; 8. The blower 46 has no faults; 9. The temperature and pressure sensor 33, the compressor inlet pressure sensor 36, the compressor inlet temperature sensor 37 and the outdoor heat exchanger outlet temperature sensor 31 have no faults.

[0166] If any of the above conditions is not met, the dual cooling function of the passenger compartment and the power battery pack 21 cannot be entered; after all the above conditions are met, perform the following operations to enter the dual cooling function of the passenger compartment and the power battery pack 21;

[0167] 1. Control the first valve port a and the second valve port b of the air conditioning three-way valve 32 to be open;

[0168] 2. The air conditioning controller controls the air conditioning compressor 35 to operate at different speeds according to the cooling requirements of the passenger compartment;

[0169] 3. The air conditioning controller controls the electromagnetic expansion valve 43 to open;

[0170] 4. The air conditioning controller controls the first electronic expansion valve 29 to open to a corresponding degree according to the cooling demand of the power battery pack 21;

[0171] 5. The air conditioning controller controls the second electronic expansion valve 40 to close;

[0172] 6. The air conditioning controller controls the stop valve 41 to close;

[0173] 7. The vehicle controller controls the third electronic water pump 20 to operate at a speed of n2 rpm;

[0174] 8. Control the first valve port a and the third valve port c of the third three-way proportional valve 18 to be open, and the second valve port b to be closed;

[0175] 9. Control the first valve port a and the third valve port c of the first three-way proportional valve 30 to be open, and the second valve port b to be closed;

[0176] 10. The air conditioning controller controls the operation of the blower 46 according to the blower 46 gear position selected by the passenger or according to the blower 46 gear position calculated by the automatic air conditioning;

[0177] In the above dual cooling process, if the passenger compartment closes the cooling demand, the air conditioning controller closes the electromagnetic expansion valve 43 and opens the first electronic expansion valve 29 to meet the single cooling demand of the power battery pack 21.

[0178] 4. Passenger compartment heating function mode of air source heat pump

[0179] In one embodiment of the present application, the specific implementation process of S102 includes:

[0180] If only the passenger compartment in the vehicle has a heating demand, the heat exchange device is controlled to operate the refrigerant side heating circuit and the water side heating circuit of the outdoor heat exchanger 2, and the electric drive system cooling circuit is controlled to operate at the same time.

[0181] Specifically, the vehicle thermal management system can also realize the passenger compartment heating function through the air-conditioning source heat pump. The air-source heat pump refers to using the outdoor heat exchanger 2 as an evaporator 47 to absorb heat in the air, and bringing the heat into the air-conditioning warm air circuit through the indoor heat exchanger 26 (as a condenser), thereby realizing the heating of the passenger compartment.

[0182] The passenger compartment heating function is realized through the air-conditioning source heat pump, including a heat pump system and a cooling system, wherein the heat pump system includes a refrigerant side heating circuit and a water side heating circuit; the cooling system includes an electric drive system cooling circuit.

[0183] Specifically, in the refrigerant side heating circuit that realizes the passenger compartment heating function through the air conditioning source heat pump, the heat exchange device is the outdoor heat exchanger 2, that is, the outlet of the compressor 35 is connected to the refrigerant side inlet of the indoor heat exchanger 26 through the first valve port a and the third valve port c of the air conditioning three-way valve 32, the refrigerant side outlet of the indoor heat exchanger 26 is connected to the inlet of the liquid storage drying tank 27, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the first port of the air conditioning four-way valve, the third port of the air conditioning four-way valve is connected to the inlet of the outdoor heat exchanger 2 through the second electronic expansion valve 40, the outlet of the outdoor heat exchanger 2 is connected to the low-pressure side inlet of the coaxial tube 38 through the stop valve 41, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35. Among them, the outlet of the outdoor heat exchanger 2 is installed with an outdoor heat exchanger outlet temperature sensor 31, and the compressor inlet temperature sensor 37 and the compressor inlet pressure sensor 36 are installed between the low-pressure side outlet of the coaxial tube 38 and the compressor inlet.

[0184] In the water-side heating circuit, the outlet of the first electronic water pump 25 is connected to the water-side inlet of the indoor heat exchanger 26, the water-side outlet of the indoor heat exchanger 26 is connected to the third valve port c of the first three-way proportional valve 30 through the sixth three-way pipe 49, the first valve port a of the first three-way proportional valve 30 is connected to the inlet of the auxiliary heat source 44, the outlet of the auxiliary heat source 44 is connected to the inlet of the warm air core 48, and the outlet of the warm air core 48 is connected to the inlet of the first electronic water pump 25 through the fifth three-way pipe 24.

[0185] In the cooling circuit of the electric drive system, the outlet of the low-temperature radiator 1 is connected to the inlet of the second electronic water pump 9 through the first three-way pipe 6 and the second three-way pipe 8. The outlet of the second electronic water pump 9 flows through the cold flow channel inside the electric drive system and is connected to the third valve port c of the second three-way proportional valve 14. The second valve port b of the second three-way proportional valve 14 is connected to the inlet of the low-temperature radiator 1. The electric drive system includes a three-in-one charger 10, a motor controller 11 and a drive bridge 12 connected in series, and a water temperature sensor 13 is installed at the outlet of the drive bridge 12.

[0186] Specifically, the passenger compartment heating function includes three working modes:

[0187] The first working mode: the passenger cabin has a heating demand and the power battery pack 21 has no passive or active cooling demand;

[0188] The second working mode: the passenger compartment has a heating demand, the power battery pack 21 has a passive cooling demand, and the electric drive system has a cooling demand;

[0189] The third mode: the passenger compartment has a heating demand, the power battery pack 21 has an active cooling demand, and the electric drive system has a cooling demand.

[0190] In the first working mode, the air conditioning system needs to judge the following conditions:

[0191] 1. The passenger compartment has a heating demand; 2. The power battery pack 21 has no active cooling and passive cooling demand; 3. The compressor 35 has no faults; 4. The air conditioning three-way valve 32, the second electronic expansion valve 40, the first electronic expansion valve 29, the electromagnetic expansion valve 43, the stop valve 41, and the first three-way proportional valve 30 have completed self-inspection and have no faults; 5. The first electronic water pump 25 has no faults; 6. The auxiliary heat source 44 has no faults; 7. T2℃<ambient temperature≤T3℃; 8. The blower 46 has no faults; 9. The temperature and pressure sensor 33, the compressor inlet pressure sensor 36, the compressor inlet temperature sensor 37 and the outdoor heat exchanger outlet temperature sensor 31 have no faults.

[0192] If any of the above conditions are not met, the passenger compartment heating function cannot be entered. After the above conditions are met, perform the following operations to enter the single passenger compartment heating function:

[0193] 1. The air conditioning controller controls the auxiliary heat source 44 to start, providing heat for the heater core 48;

[0194] 2. The air conditioning controller controls the compressor 35 to operate at different speeds according to the heating demand;

[0195] 3. The air conditioning controller controls the first valve port a and the third valve port c of the air conditioning three-way valve 32 to be opened;

[0196] 4. The air conditioning controller controls the second electronic expansion valve 40 to open or close;

[0197] 5. The air conditioning controller controls the first electronic expansion valve 29 to close;

[0198] 6. The air conditioning controller controls the electromagnetic expansion valve 43 to open or close according to whether there is a dehumidification demand during the heating process of the passenger compartment;

[0199] 7. The air conditioning controller controls the stop valve 41 to open;

[0200] 8. The air conditioning controller controls the first valve port a and the third valve port c of the first three-way proportional valve 30 to be connected, and the second valve port b is closed;

[0201] 9. The air conditioning controller controls the first electronic water pump 25 to run at a speed of n1 rpm;

[0202] 10. The air conditioning controller controls the operation of the blower 46 according to the blower 46 gear position selected by the passenger or according to the blower 46 gear position calculated by the automatic air conditioning;

[0203] 11. When the electric drive system has a cooling demand, the vehicle controller controls the second electronic water pump 9 to operate at different speeds according to the cooling demand of the electric drive system, provided that the second electronic water pump 9 and the second three-way proportional valve 14 are not faulty; and controls the second valve port b and the third valve port c of the second three-way proportional valve 14 to be opened, and the first valve port a to be closed.

[0204] In this embodiment, the execution of the second working mode requires the following adjustments based on the first working mode:

[0205] 1. The vehicle controller controls the first valve port a, the second valve port b, and the third valve port c of the second three-way proportional valve 14 to be connected;

[0206] 2. The vehicle controller controls the first valve port a and the second valve port b of the third three-way proportional valve 18 to be connected, and the third valve port c is closed;

[0207] 3. The vehicle controller controls the third electronic water pump 20 to run at a speed of n2 rpm;

[0208] In this embodiment, the third working mode needs to make the following adjustments based on the first working mode:

[0209] 1. The air conditioning controller controls the opening of the first electronic expansion valve 29 according to the cooling demand of the power battery pack 21;

[0210] 2. The vehicle controller controls the second valve port b and the third valve port c of the second three-way proportional valve 14 to be connected, and the first valve port a is closed;

[0211] 3. The vehicle controller controls the first valve port a and the third valve port c of the third three-way proportional valve 18 to be connected, and the second valve port b to be closed.

[0212] In the third working mode mentioned above, the power battery pack 21 can be cooled and at the same time, the heat absorbed by the power battery pack can be released to the warm air circuit through the indoor heat exchanger 26 of the heat pump system, thereby reducing the energy consumption of the auxiliary heat source 44, increasing the heating amount of the passenger compartment, improving the heating effect, optimizing the vehicle's endurance, and enhancing the competitiveness of the vehicle product.

[0213] 5. Air source heat pump realizes battery pack single heating function mode

[0214] In one embodiment of the present application, the specific implementation process of S102 further includes:

[0215] If only the power battery pack 21 in the vehicle has a heating demand, the heat exchange device is controlled to operate the refrigerant side heating circuit and the water side heating circuit of the outdoor heat exchanger 2, and the power battery heating circuit is controlled to operate at the same time.

[0216] Specifically, when the power battery pack 21 has a heating demand, the passenger compartment has no heating demand, and the electric drive system has a cooling demand, the air source heat pump can realize the battery pack heating function. This functional mode includes the refrigerant side heating circuit of the power battery pack 21, the water side heating circuit and the power battery heating circuit.

[0217] In the refrigerant side heating circuit of the power battery pack 21, the outlet of the compressor 35 is connected to the first valve port a of the air conditioning three-way valve 32, the third valve port c of the air conditioning three-way valve 32 is connected to the refrigerant side inlet of the indoor heat exchanger 26, the refrigerant side outlet of the indoor heat exchanger 26 is connected to the inlet of the liquid storage drying tank 27, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the first port of the air conditioning four-way tube 39, the third port of the air conditioning four-way tube 39 is connected to the inlet of the outdoor heat exchanger 2 through the second electronic expansion valve 40, the outlet of the outdoor heat exchanger 2 is connected to the low-pressure side inlet of the coaxial tube 38 through the stop valve 41, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35. Among them, the outdoor heat exchanger 2 outlet is equipped with an outdoor heat exchanger outlet temperature sensor 31, and the compressor inlet temperature sensor 37 and the compressor inlet pressure sensor 36 are installed between the low-pressure side outlet of the coaxial tube 38 and the compressor inlet.

[0218] In the water-side heating circuit of the power battery pack 21, the outlet of the first electronic water pump 25 is connected to the water-side inlet of the indoor heat exchanger 26, the water-side outlet of the indoor heat exchanger 26 is connected to the third valve port c of the first three-way proportional valve 30 through the sixth three-way pipe 49, the first valve port a of the first three-way proportional valve 30 is connected to the inlet of the auxiliary heat source 44, the outlet of the auxiliary heat source 44 is connected to the inlet of the warm air core 48, and the outlet of the warm air core 48 is connected to the inlet of the first electronic water pump 25 through the fifth three-way pipe 24.

[0219] In the power battery heating circuit, the outlet of the third electronic water pump 20 flows through the heat flow channel of the power battery pack 21, and then passes through the seventh three-way pipe 22 and the eighth three-way pipe 23 to be connected to the second valve port b of the first three-way proportional valve 30, the first valve port a of the first three-way proportional valve 30 is connected to the inlet of the auxiliary heat source 44, the outlet of the auxiliary heat source 44 is connected to the inlet of the heater core 48, and the outlet of the heater core 48 is connected to the inlet of the third electronic water pump 20 through the fifth three-way pipe 24 and the fourth three-way pipe 19.

[0220] In this embodiment, when there is no heating demand in the passenger compartment and there is a heating demand for the battery pack, the air conditioning system determines the following conditions:

[0221] 1. There is no heating demand in the passenger compartment; 2. There is a heating demand for the power battery pack 21; 3. The compressor 35 has no faults; 4. The air conditioning three-way valve 32, the second electronic expansion valve 40, the first electronic expansion valve 29, the electromagnetic expansion valve 43, the stop valve 41, the first three-way proportional valve 30, the second three-way proportional valve 14 and the third three-way proportional valve 18 have completed self-inspection and have no faults; 5. The first electronic water pump 25 and the third electronic water pump 20 have no faults; 6. The auxiliary heat source 44 has no faults; 7. T2℃<ambient temperature≤T3℃; 8. The blower 46 has no faults; 9. The temperature and pressure sensor 33, the compressor inlet pressure sensor 36, the compressor inlet temperature sensor 37 and the outdoor heat exchanger outlet temperature sensor 31 have no faults.

[0222] If any of the above conditions are not met, the battery pack heating function cannot be entered. After all the above conditions are met, perform the following operations to enter the battery pack heating function:

[0223] 1. The air conditioning controller controls the auxiliary heat source 44 to start according to the target water temperature t1°C for heating the power battery pack 21, so as to provide heat for the power battery pack 21;

[0224] 2. The air conditioning controller controls the compressor 35 to operate at different speeds according to the heating demand of the power battery pack 21 to heat the target water temperature t1°C;

[0225] 3. The air conditioning controller controls the first valve port a and the third valve port c of the air conditioning three-way valve 32 to be connected;

[0226] 4. The air conditioning controller controls the second electronic expansion valve 40 to open or close; controls the first electronic expansion valve 29 to close, controls the electromagnetic expansion valve 43 to close; controls the stop valve 41 to open; controls the first valve port a, the second valve port b and the third valve port c of the first three-way proportional valve 30 to be connected;

[0227] 5. The air conditioning controller controls the first electronic water pump 25 to run at a speed of n1 rpm;

[0228] 6. The air conditioning controller controls the blower 46 to stop;

[0229] 7. The vehicle controller controls the operation of the second electronic water pump 9 according to the cooling requirements of the electric drive system;

[0230] 8. The vehicle controller controls the second valve port b and the third valve port c of the second three-way proportional valve 14 to be connected, and the first valve port a is closed; controls the first valve port a and the second valve port b of the third three-way proportional valve 18 to be connected, and the third valve port c is closed;

[0231] 9. The vehicle controller controls the third electronic water pump 20 to run at n2 rpm.

[0232] 6. Air source heat pump realizes dual heating function mode of passenger compartment and power battery pack

[0233] In one embodiment of the present application, the specific implementation process of S102 further includes:

[0234] If both the passenger compartment and the power battery pack 21 in the vehicle have heating requirements, the heat exchange device is controlled to operate the refrigerant side heating circuit, the water side heating circuit, and the power battery heating circuit of the outdoor heat exchanger 2, and the blower of the vehicle thermal management system is controlled to operate at the same time.

[0235] Specifically, when the power battery pack 21 has a heating demand, the passenger compartment has a heating demand, and the electric drive system has a cooling demand, the air source heat pump can also realize the dual heating function of the passenger compartment and the power battery pack 21. The realization process of this function is the same as the realization process of the battery pack single heating function, which will not be repeated here.

[0236] Specifically, when the air source heat pump heats the power battery pack 21, the air conditioning controller controls the blower 46 to operate, thereby achieving dual heating of the passenger compartment and the power battery pack 21, and at this time, the target temperature of the auxiliary heat source 44 is determined based on the heating demand of the passenger compartment.

[0237] When the inlet water temperature of the power battery pack 21 is higher than T4℃, the air conditioning controller controls the second valve port b of the first three-way proportional valve 30 to be closed, and the first valve port a and the third valve port c are connected. At the same time, the power battery pack 21 turns on the temperature equalization mode. In the temperature equalization mode, the vehicle controller controls the first valve port a and the third valve port c of the third three-way proportional valve 18 to be connected, and the second valve port b is closed; the vehicle controller controls the third electronic water pump 20 to run at n2 rpm. When the inlet water temperature of the power battery pack 21 is lower than T5℃ and the power battery pack 21 still needs to be heated, it will be operated again according to the above scheme, and this will be repeated until the heating is completed.

[0238] 7. Water source heat pump realizes passenger compartment heating function mode

[0239] In one embodiment of the present application, the specific implementation process of S102 further includes:

[0240] If only the passenger compartment in the vehicle has a heating demand, the heat exchange device is controlled to operate the refrigerant side heating circuit and the water side heating circuit of the refrigerant heat exchanger 17, and the motor cooling circuit is controlled to operate at the same time;

[0241] Specifically, the water source heat pump absorbs heat in the water circuit (such as waste heat recovery from the motor or battery pack) through the refrigerant heat exchanger 17, and brings the heat into the air conditioning and heating system through the indoor heat exchanger 26, thereby achieving passenger compartment heating by the water source heat pump.

[0242] The passenger compartment heating function of the water source heat pump includes the water-side heating circuit and the refrigerant-side heating circuit of the air-conditioning system and the motor cooling circuit of the cooling system;

[0243] Among them, the water side heating circuit of the water source heat pump is as shown in the water side heating circuit of the passenger compartment heating function mode (IV) of the air source heat pump, and the motor cooling circuit is not repeated here.

[0244] In the refrigerant side heating circuit, the outlet of the compressor 35 is connected to the first valve port a of the air conditioning three-way valve 32, the third valve port c is connected to the refrigerant side inlet of the indoor heat exchanger 26, the refrigerant side outlet of the indoor heat exchanger 26 is connected to the inlet of the liquid storage drying tank 27, the outlet of the liquid storage drying tank 27 is connected to the high-pressure side inlet of the coaxial tube 38, the high-pressure side outlet of the coaxial tube 38 is connected to the first port of the air conditioning four-way tube 39, the fourth port of the air conditioning four-way tube 39 is connected to the refrigerant side inlet of the refrigerant heat exchanger Chiller through the first electronic expansion valve 29, the refrigerant side outlet of the refrigerant heat exchanger 17 is connected to the low-pressure side inlet of the coaxial tube 38, and the low-pressure side outlet of the coaxial tube 38 is connected to the inlet of the compressor 35. Among them, the compressor outlet is installed with a temperature and pressure sensor 33, the refrigerant side outlet of the refrigerant heat exchanger 17 is installed with a Chiller outlet temperature sensor 28; the compressor 35 inlet is installed with a compressor inlet temperature sensor 37 and a compressor inlet pressure sensor 36.

[0245] In the motor cooling circuit, the outlet of the second electronic water pump 9 flows through the cold flow channel inside the electric drive system and is connected to the first valve port a of the second three-way proportional valve 14, the third valve port c of the second three-way proportional valve 14 is connected to the second valve port b of the third three-way proportional valve 18, the third valve port c of the third three-way proportional valve 18 is connected to the water side inlet of the refrigerant heat exchanger 17, and the water side outlet of the refrigerant heat exchanger 17 is connected to the inlet of the second electronic water pump 9 through the third three-way pipe 16 and the second three-way pipe 8.

[0246] In this embodiment, when the passenger compartment has a heating demand and the battery pack has no cooling, heating, or temperature equalization demand, the air conditioning controller determines the following conditions:

[0247] 1. There is a heating demand in the passenger compartment; 2. The air conditioning controller sends a waste heat recovery request to the vehicle controller; 3. There is no heating, cooling or temperature equalization demand for the power battery pack 21; 4. The compressor 35 has no fault; 5. The air conditioning three-way valve 32, the second electronic expansion valve 40, the first electronic expansion valve 29, the electromagnetic expansion valve 43, the stop valve 41, the first three-way proportional valve 30, the third three-way proportional valve 18 and the second three-way proportional valve 14 have completed self-inspection and have no faults; 6. The first electronic water pump 25, the second electronic water pump 9 and the third electronic water pump 20 have no faults; 7. The auxiliary heat source 44 has no faults; 8. T2℃<ambient temperature≤T3℃; 9. The blower 46 has no faults; 10. The temperature and pressure sensor 33, the compressor inlet pressure sensor 36, the compressor inlet temperature sensor 37 and the outdoor heat exchanger outlet temperature sensor 31 have no faults.

[0248] If any of the above conditions are not met, the passenger compartment heating function mode of the water source heat pump cannot be entered; if the above conditions are met, perform the following operations to enter this function:

[0249] 1. The vehicle controller feeds back the "waste heat recovery request permission" signal;

[0250] 2. The air conditioning controller controls the auxiliary heat source 44 to start according to the heating demand of the passenger compartment, so as to realize the heating of the passenger compartment;

[0251] 3. The air conditioning controller controls the compressor 35 to operate at different speeds according to the heating demand of the passenger compartment;

[0252] 4. The air conditioning controller controls the first valve port a and the third valve port c of the air conditioning three-way valve 32 to be opened, and the second valve port b to be closed;

[0253] 5. The air conditioning controller controls the second electronic expansion valve 40 to close; controls the first electronic expansion valve 29 to open; and controls the stop valve 41 to close;

[0254] 6. When there is a need for defrosting or defoggering in the passenger compartment, the air conditioning controller controls the electromagnetic expansion valve 43 to open, otherwise, the electromagnetic expansion valve 43 is controlled to close;

[0255] 7. The air conditioning controller controls the first valve port a and the third valve port c of the first three-way proportional valve 30 to be connected, and the second valve port b is closed;

[0256] 8. The air conditioning controller controls the first electronic water pump 25 to run at a speed of n1 rpm;

[0257] 9. The air conditioning controller controls the operation of the blower 46 according to the blower 46 gear position selected by the passenger or according to the blower 46 gear position calculated by the automatic air conditioning;

[0258] 10. The vehicle controller controls the operation of the second electronic water pump 9 according to the cooling requirements of the electric drive system;

[0259] 11. The vehicle controller controls the second three-way proportional valve 14 so that the first valve port a and the third valve port c are connected, and the second valve port b is closed;

[0260] 12. The vehicle controller controls the second valve port b and the third valve port c of the third three-way proportional valve 18 to be connected, and the first valve port a is closed;

[0261] 13. The vehicle controller controls the third electronic water pump 20 to stop.

[0262] 8. Water source heat pump realizes dual heating function mode of passenger compartment and power battery pack 21

[0263] In one embodiment of the present application, the specific implementation process of S102 further includes:

[0264] If both the passenger compartment and the power battery pack 21 in the vehicle have heating requirements, the heat exchange device is controlled to operate the refrigerant side heating circuit, the water side heating circuit and the motor cooling circuit of the refrigerant heat exchanger 17; and the first port, the second port and the third port of the first throttling element are controlled to be connected, and the third electronic water pump 20 is controlled to operate.

[0265] Specifically, in the water source heat pump realizing the dual heating function mode of the passenger compartment and the power battery pack 21, when the air conditioning controller detects the battery pack heating demand fed back by the vehicle controller and the passenger compartment has a heating demand, according to the judgment conditions mentioned in the water source heat pump realizing the passenger compartment heating function mode (VII), when it is detected that all components are fault-free, the water source heat pump realizes the passenger compartment heating function mode (VII) operation, wherein the operations involving the first three-way proportional valve 30 and the third electronic water pump 20 need to be changed as follows:

[0266] 1. The air conditioning controller controls the first valve port a, the second valve port b, and the third valve port c of the first three-way proportional valve 30 to be connected;

[0267] 2. The vehicle controller controls the third electronic water pump 20 to run at n2 rpm.

[0268] 9. Water source heat pump realizes passenger compartment heating and battery pack cooling function mode

[0269] In one embodiment of the present application, the specific implementation process of S102 includes:

[0270] If the passenger compartment in the vehicle has a heating demand and the power battery pack 21 has a cooling demand, the heat exchange device is controlled to operate the refrigerant side heating circuit, the water side heating circuit and the motor cooling circuit of the refrigerant heat exchanger 17; at the same time, the first port, the second port and the third port of the third throttling element are controlled to be connected, and the third electronic water pump 20 is controlled to operate.

[0271] In this mode, when the vehicle controller determines that the power battery pack 21 has a cooling demand and detects that the air conditioning controller feeds back a "waste heat recovery request" signal, it will follow the judgment conditions mentioned in the water source heat pump to realize the passenger compartment heating function mode (VII). When all components are detected to be fault-free, the water source heat pump to realize the passenger compartment heating function mode (VII) is executed. Among them, the operations involving the third three-way proportional valve 18 and the third electronic water pump 20 need to be changed as follows:

[0272] 1. The vehicle controller controls the first valve port a, the second valve port b, and the third valve port c of the third three-way proportional valve 18 to be connected;

[0273] 2. The vehicle controller controls the third electronic water pump 20 to run at n2 rpm.

[0274] When the water source heat pump realizes the passenger compartment heating and battery pack cooling function mode, all the heat of the power battery pack 21 and the electric drive system can be recovered for heating the passenger compartment, while satisfying the cooling of the power battery pack 21, further improving the utilization rate of waste heat.

[0275] 10. Water source heat pump and air source heat pump to achieve passenger cabin heating

[0276] In a possible embodiment, the specific implementation process of S102 further includes:

[0277] If only the passenger compartment in the vehicle has a heating demand, the heat exchange device is controlled to be the refrigerant side heating circuit of the refrigerant heat exchanger 17, the heat exchange device is the refrigerant side heating circuit of the outdoor heat exchanger 2, the water side heating circuit and the motor cooling circuit.

[0278] Specifically, when the vehicle controller determines that the vehicle thermal management system meets the waste heat recovery conditions and the air source heat pump trigger conditions, the air-conditioning controller can control the vehicle thermal management system to execute the water source heat pump to realize the passenger compartment heating function mode (seven) and the air source heat pump to realize the passenger compartment heating function mode (four), thereby controlling the vehicle thermal management system to simultaneously realize environmental and power system heat recovery.

[0279] 11. Heat pump defrosting

[0280] In one embodiment of the present application, the control method of the vehicle thermal management system further includes:

[0281] If the vehicle has a defrosting demand, the defrosting circuit on the refrigerant side, the heating circuit on the water side and the motor cooling circuit are controlled to operate.

[0282] Specifically, in the air source heat pump mode, the outdoor heat exchanger 2 acts as an evaporator 47 to absorb heat from the environment. When the surface temperature of the outdoor heat exchanger 2 is lower than t2°C, a layer of frost will be formed on the surface of the outdoor heat exchanger 2, affecting the air intake through the outdoor heat exchanger 2, thereby affecting the heating effect of the heat pump. Therefore, defrosting is required at this time.

[0283] During defrosting, the air conditioning system circuit needs to be switched so that the outdoor heat exchanger 2 is converted from an evaporator 47 to a condenser, and the defrosting function is achieved by condensing and releasing heat.

[0284] The heat pump defrosting function mode includes the air conditioning system water side circuit, the refrigerant side circuit and the motor cooling circuit. Among them, the air conditioning system water side circuit is shown as the water side heating circuit in the passenger compartment heating function mode (IV) of the air source heat pump; the refrigerant side circuit is shown as the refrigerant side refrigeration circuit of the outdoor heat exchanger 2 in the passenger compartment and power battery pack 21 dual cooling function mode (III) of the outdoor heat exchanger 2; the motor cooling circuit is shown as the motor cooling circuit in the water source heat pump to achieve the passenger compartment heating function mode (VII), which will not be repeated here.

[0285] In this embodiment, the air conditioning controller determines the following conditions:

[0286] 1. The passenger compartment has a defrosting demand; 2. The air conditioning controller sends a heat pump defrosting request to the vehicle controller; 3. The power battery pack 21 has no temperature equalization demand; 4. The compressor 35 has no fault; 5. The air conditioning three-way valve 32, the second electronic expansion valve 40, the first electronic expansion valve 29, the electromagnetic expansion valve 43, the stop valve 41, the first three-way proportional valve 30, the third three-way proportional valve 18 and the second three-way proportional valve 14 have completed self-inspection and have no faults; 6. The first electronic water pump 25, the second electronic water pump 9 and the third electronic water pump 20 have no faults; 7. The auxiliary heat source 44 has no faults; 8. T2℃<ambient temperature≤T3℃; 9. The blower 46 has no faults; 10. The temperature and pressure sensor 33, the compressor inlet pressure sensor 36, the compressor inlet temperature sensor 37 and the outdoor heat exchanger outlet temperature sensor 31 have no faults.

[0287] If any of the above conditions are not met, the heat pump defrost function mode cannot be entered; after all the above conditions are met, perform the following operations to enter the heat pump defrost function mode:

[0288] 1. The vehicle controller feeds back the "heat pump defrost allowed" signal;

[0289] 2. The air conditioning controller controls the auxiliary heat source 44 to start according to the heating demand of the passenger compartment, so as to realize the heating of the passenger compartment;

[0290] 3. The air conditioning controller controls the compressor 35 to operate at different speeds according to the defrosting requirements;

[0291] 4. The air conditioning controller controls the first valve port a and the second valve port b of the air conditioning three-way valve 32 to be connected, and the third valve port c is closed;

[0292] 5. The air conditioning controller controls the second electronic expansion valve 40 to close; controls the first electronic expansion valve 29 to open; and controls the stop valve 41 to close;

[0293] 6. When there is a need for defrosting or defoggering in the passenger compartment, the air conditioning controller controls the electromagnetic expansion valve 43 to open, otherwise, the electromagnetic expansion valve 43 is controlled to close;

[0294] 7. The air conditioning controller controls the first valve port a and the third valve port c of the first three-way proportional valve 30 to be connected, and the second valve port b is closed;

[0295] 8. The air conditioning controller controls the first electronic water pump 25 to run at a speed of n1 rpm;

[0296] 9. The air conditioning controller controls the operation of the blower 46 according to the blower 46 gear position selected by the passenger or according to the blower 46 gear position calculated by the automatic air conditioning;

[0297] 10. The vehicle controller controls the operation of the second electronic water pump 9 according to the cooling requirements of the electric drive system;

[0298] 11. The vehicle controller controls the first valve port a and the third valve port c of the second three-way proportional valve 14 to be connected, and the second valve port b is closed;

[0299] 12. The vehicle controller controls the second valve port b and the third valve port c of the third three-way proportional valve 18 to be connected, and the first valve port a is closed;

[0300] 13. The vehicle controller controls the third electronic water pump 20 to stop;

[0301] 14. When the vehicle defrosting time is greater than Xmin, this function will be stopped regardless of whether the frost on the outdoor heat exchanger 2 of the vehicle has been completely defrosted.

[0302] 12. Auxiliary heat source 44 heats the passenger compartment

[0303] In one embodiment of the present application, the control method of the vehicle thermal management system further includes:

[0304] If the passenger compartment of the vehicle has a heating demand but the current ambient temperature is lower than a second temperature threshold, the water-side heating circuit is controlled to operate.

[0305] Specifically, when the ambient temperature is ≤ the second temperature threshold T2°C, the air conditioning system cannot use the heat pump function due to the physical characteristics of the air conditioning refrigerant. At this time, the heating of the passenger compartment can only be achieved through the auxiliary heat source 44.

[0306] In this embodiment, the air conditioning controller determines the following conditions:

[0307] 1. The passenger compartment has a heating demand; 2. The power battery pack 21 has no heating demand; 3. The compressor 35 has no fault; 4. The air conditioning three-way valve 32, the second electronic expansion valve 40, the first electronic expansion valve 29, the electromagnetic expansion valve 43, the stop valve 41, the first three-way proportional valve 30 and the third three-way proportional valve 18 have completed self-inspection and have no faults; 5. The first electronic water pump 25 has no faults; 6. The auxiliary heat source 44 has no faults; 7. The ambient temperature is ≤T2℃; 8. The blower 46 has no faults.

[0308] If any of the above conditions is not met, the function cannot be entered; after all the above conditions are met, the following operations are performed to enter the auxiliary heat source 44 heating passenger compartment function mode:

[0309] 1. The air conditioning controller controls the auxiliary heat source 44 to start according to the heating demand of the passenger compartment, so as to realize the heating of the passenger compartment;

[0310] 2. The air conditioning controller controls the compressor 35 to stop running;

[0311] 3. The air conditioning controller controls the second electronic expansion valve 40, the first electronic expansion valve 29, the electromagnetic expansion valve 43, and the stop valve 41 to close;

[0312] 4. The air conditioning controller controls the first valve port a and the third valve port c of the first three-way proportional valve 30 to be connected, and the second valve port b is closed;

[0313] 5. The air conditioning controller controls the first electronic water pump 25 to run at a speed of n1 rpm;

[0314] 6. The air conditioning controller controls the operation of the blower 46 according to the blower 46 gear position selected by the passenger or according to the blower 46 gear position calculated by the automatic air conditioning.

[0315] 13. Auxiliary heat source 44 heating passenger compartment and power battery pack 21 function mode

[0316] In one embodiment of the present application, the control method of the vehicle thermal management system further includes:

[0317] If the current ambient temperature is lower than the second temperature threshold, both the passenger compartment and the power battery pack 21 of the vehicle have heating requirements, and the water-side heating circuit and the power battery heating circuit are controlled to operate.

[0318] During the heating process of the passenger compartment, the air-conditioning controller detects the "power battery pack 21 heating demand" signal fed back by the vehicle controller. On the premise that the passenger compartment meets the heating needs, the air-conditioning controller sends the "passenger compartment meets the heating needs" signal to the vehicle controller, and at the same time controls the first valve port a, the second valve port b, and the third valve port c of the first three-way proportional valve 30 to be connected. The vehicle controller controls the third electronic water pump 20 to run at a speed of n2 rpm, and at the same time controls the second valve port b and the third valve port c of the third three-way proportional valve 18 to be connected, and the first valve port a is closed.

[0319] The functional mode of the auxiliary heat source 44 heating the passenger compartment and the power battery pack 21 includes a water-side heating circuit and a power battery heating circuit; wherein, the water-side heating circuit is as shown in the water-side heating circuit in the passenger compartment heating functional mode (IV) of the air source heat pump, and the power battery heating circuit is as shown in the power battery heating circuit in the battery pack single heating functional mode (V) of the air source heat pump, which will not be repeated here.

[0320] It can be seen from the above embodiments that, on the first hand, the vehicle thermal management system provided by the present application realizes dual-path cooling through the indoor heat exchanger 26 and the outdoor heat exchanger 2, and uses the outdoor heat exchanger 2 to improve the air-conditioning refrigeration performance, thereby solving the problem that only the indoor heat exchanger 26 is used under refrigeration conditions, and the passenger compartment is cooled slowly due to the low heat exchange efficiency of the indoor heat exchanger 26, thereby affecting driving comfort. In addition, the air-conditioning cooling and heating circuits in the vehicle thermal management system provided by the present application share the liquid storage drying tank 27 and the coaxial tube 38, thereby reducing the use of the gas-liquid separator, improving the system integration, reducing the cost and layout complexity of the air-conditioning system, and avoiding the outdoor heat exchanger 2 of the air-conditioning from switching from the cooling mode to the heat pump mode due to insufficient evaporation of the refrigerant. This leads to the risk of liquid shock in the compressor 35; on the second aspect, the vehicle thermal management system described in the present application utilizes an air-conditioning three-way valve instead of a branch stop valve to achieve switching of the air-conditioning circulation loop, thereby reducing the number of components and optimizing the layout of the vehicle; on the third aspect, the present application can realize a water source heat pump to recover waste heat from the electric drive system and the battery system, while meeting the heating needs of the passenger compartment, while also cooling the power battery pack 21, thereby improving the energy utilization rate of the vehicle, further improving the vehicle's endurance, and increasing the market competitiveness of the vehicle model; on the fourth aspect, the present application can realize a water source heat pump, an air source heat pump mode, and an auxiliary heat source mode to simultaneously or separately meet the heating needs of the passenger compartment and the power battery pack 21, thereby achieving diversified heating forms.

[0321] In the above embodiments, the description of each embodiment has its own emphasis. For parts that are not described or recorded in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0322] In addition, the embodiments shown in the drawings of the present application or the features of the various embodiments mentioned in this specification are not necessarily understood as independent embodiments. Instead, each feature described in one example of an embodiment can be combined with one or more other desired features from other embodiments to produce other embodiments not described in words or with reference to the drawings.

[0323] The embodiments described above are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, a person skilled in the art should understand that the technical solutions described in the aforementioned embodiments may still be modified, or some of the technical features may be replaced by equivalents. Such modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application, and should all be included in the protection scope of the present application.

Claims

1. A vehicle thermal management system, characterized in that: include: Air conditioning system; The air conditioning system comprises an outdoor heat exchanger refrigeration circuit and an indoor heat exchanger refrigeration circuit, wherein the outdoor heat exchanger refrigeration circuit comprises an outdoor heat exchanger refrigerant side refrigeration circuit; the indoor heat exchanger refrigeration circuit comprises an indoor heat exchanger refrigerant side refrigeration circuit; The refrigeration circuit on the refrigerant side of the indoor heat exchanger includes a compressor, an air conditioning three-way valve, an indoor heat exchanger, a liquid storage drying tank, a coaxial tube and an evaporator; The refrigeration circuit on the refrigerant side of the outdoor heat exchanger includes the compressor, the air conditioning three-way valve, the outdoor heat exchanger, the liquid storage drying tank, the coaxial tube and the heat exchange device; The outlet of the compressor is connected to the indoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the evaporator, the low-pressure side of the coaxial tube, and the compressor inlet in sequence through the air conditioning three-way valve to form a refrigeration circuit on the refrigerant side of the indoor heat exchanger; The outlet of the compressor is connected to the outdoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the heat exchange device, the low-pressure side of the coaxial tube, and the inlet of the compressor in sequence through the air-conditioning three-way valve to form a refrigeration circuit on the refrigerant side of the outdoor heat exchanger.

2. The vehicle thermal management system according to claim 1, characterized in that: The refrigeration circuit on the refrigerant side of the outdoor heat exchanger also includes an air conditioning four-way pipe; the refrigeration circuit on the refrigerant side of the indoor heat exchanger also includes the air conditioning four-way pipe; In the refrigeration circuit on the refrigerant side of the indoor heat exchanger, the air conditioning cross-tube is connected between the high-pressure side of the coaxial tube and the evaporator; In the refrigeration circuit on the refrigerant side of the outdoor heat exchanger, the air conditioning four-way pipe is connected between the high-pressure side of the coaxial pipe and the heat exchange device.

3. The vehicle thermal management system according to claim 1, characterized in that: The indoor heat exchanger refrigeration circuit also includes an indoor heat exchanger water-side refrigeration circuit; The indoor heat exchanger water side refrigeration circuit includes a low temperature radiator, a first electronic water pump, the indoor heat exchanger and a first throttling element; The outlet of the low-temperature radiator is connected to the first electronic water pump, the water side of the indoor heat exchanger, the first throttling element, and the inlet of the low-temperature radiator in sequence to form a refrigeration circuit on the water side of the indoor heat exchanger.

4. The vehicle thermal management system according to claim 1, characterized in that: The vehicle thermal management system also includes an electric drive system; the outdoor heat exchanger refrigeration circuit also includes an electric drive system cooling circuit; The electric drive system cooling circuit includes a low-temperature radiator, a second throttling element and a second electronic water pump; The outlet of the low-temperature radiator is connected to the second electronic water pump, the cold flow channel inside the electric drive system, the second throttling element, and the inlet of the low-temperature radiator in sequence to form a cooling circuit for the electric drive system.

5. The vehicle thermal management system according to claim 1, characterized in that: When the heat exchange device is the evaporator, the refrigerant side refrigeration circuit of the outdoor heat exchanger is used to realize the passenger compartment refrigeration function; When the heat exchange device is a refrigerant heat exchanger, the refrigerant side refrigeration circuit of the outdoor heat exchanger is also used to realize the power battery pack refrigeration function.

6. The vehicle thermal management system according to claim 1, characterized in that: The vehicle thermal management system also includes a power battery pack; The outdoor heat exchanger refrigeration circuit also includes an outdoor heat exchanger water-side refrigeration circuit of the power battery pack; The water-side refrigeration circuit of the outdoor heat exchanger of the power battery pack includes a third electronic water pump, a third throttling element and a refrigerant heat exchanger; The outlet of the third electronic water pump is connected to the cold flow channel of the power battery pack, the third throttling element, the water side of the refrigerant heat exchanger, and the inlet of the third electronic water pump in sequence to form a refrigeration circuit on the water side of the outdoor heat exchanger of the power battery pack.

7. The vehicle thermal management system according to claim 1, characterized in that: The vehicle thermal management system also includes a heat pump system; the heat pump system includes a refrigerant side heating circuit and a water side heating circuit; When the refrigerant-side heating circuit is used to realize the passenger compartment heating function, it includes the compressor, the air conditioning three-way valve, the indoor heat exchanger, the liquid storage drying tank, the coaxial tube and the outdoor heat exchanger; When the refrigerant-side heating circuit is used to realize the power battery pack heating function, it includes the compressor, the air conditioning three-way valve, the indoor heat exchanger, the liquid storage drying tank, the coaxial tube and the refrigerant heat exchanger; The outlet of the compressor is connected to the refrigerant side of the indoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the outdoor heat exchanger, the low-pressure side of the coaxial tube, and the inlet of the compressor in sequence through the air conditioning three-way valve to form a refrigerant side heating circuit for realizing the passenger compartment heating function; The outlet of the compressor is connected to the refrigerant side of the indoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the refrigerant heat exchanger, the low-pressure side of the coaxial tube, and the inlet of the compressor in sequence through the air conditioning three-way valve to form a refrigerant side heating circuit for realizing the heating function of the power battery pack; The water-side heating circuit includes a first electronic water pump, a first throttling element, the indoor heat exchanger, an auxiliary heat source and a warm air core; The first electronic water pump is connected in sequence to the water side of the indoor heat exchanger, the first throttling element, the auxiliary heat source, the heater core, and the inlet of the first electronic water pump to form the water side heating circuit.

8. The vehicle thermal management system according to claim 7, characterized in that: The vehicle thermal management system also includes an electric drive system; the heat pump system also includes an electric drive system cooling circuit; The electric drive system cooling circuit includes a low-temperature radiator, a second throttling element and a second electronic water pump; The outlet of the low-temperature radiator is connected to the second electronic water pump, the cold flow channel inside the electric drive system, the second throttling element, and the inlet of the low-temperature radiator in sequence to form a cooling circuit for the electric drive system.

9. The vehicle thermal management system according to claim 8, characterized in that: The heat exchange device is a refrigerant heat exchanger, the vehicle thermal management system also includes an electric drive system; the heat pump system also includes a motor cooling circuit; The motor cooling circuit includes a second electronic water pump, a second throttling element, a refrigerant heat exchanger and a third throttling element; The second electronic water pump is connected in sequence to the cold flow channel inside the electric drive system, the second throttling element, the third throttling element, the water side of the refrigerant heat exchanger, and the inlet of the second electronic water pump to form the motor cooling circuit.

10. The vehicle thermal management system according to claim 7, characterized in that: The vehicle thermal management system also includes a power battery pack; The heat pump system also includes a power battery heating circuit; The power battery heating circuit includes the first throttling element, the auxiliary heat source, the heater core and a third electronic water pump; The outlet of the third electronic water pump is connected in sequence to the heat flow channel in the power battery pack, the first throttling element, the auxiliary heat source, the heater core, and the inlet of the third electronic water pump to form the power battery heating circuit.

11. The vehicle thermal management system according to claim 7, characterized in that: The heat exchange device includes a refrigerant heat exchanger; the heat pump system also includes a refrigerant side defrosting circuit; The outlet of the compressor is connected to the outdoor heat exchanger, the liquid storage drying tank, the high-pressure side of the coaxial tube, the refrigerant side of the refrigerant heat exchanger, the low-pressure side of the coaxial tube, and the inlet of the compressor in sequence through the air-conditioning three-way valve to form the refrigerant side defrost circuit.

12. A vehicle, characterized in that: It comprises a vehicle thermal management system as described in any one of claims 1 to 11.

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