Full-temperature-range whole vehicle heat system framework based on R290 environment-friendly refrigerant

Abstract

The invention belongs to the technical field of electric vehicles, and particularly relates to an R290 environment-friendly refrigerant-based full-temperature-range whole vehicle heat system framework which comprises a compressor, an LCC condenser, a WPTC, a water pump H, a water pump B, a water pump M, a first four-way valve, a second four-way valve, a heating core in an HVAC, an EVAP evaporator, a first three-way valve, a second three-way valve, a chiller 1, a chiller 2, an air conditioner water pump and a battery HVB. According to the technical scheme, R290 environment-friendly refrigerants are used, combustible refrigerants are prevented from entering a passenger compartment through an air conditioner water circulation loop, full-temperature-range heat management can be achieved, heat of all heating parts of the whole vehicle can be effectively utilized, heat loss of the whole vehicle is effectively reduced, the passenger compartment and a battery can be heated through waste heat of a motor in spring and autumn, and energy consumption is reduced.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicles, and in particular relates to a full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant. Background Art

[0002] When electric vehicles are running in low-temperature environments, the thermal management system needs to provide enough heat to the interior of the vehicle to ensure a comfortable environment. The most typical heating method is PTC heating. Although its structure is simple and easy to control, its heating efficiency is low (0.95), which will cause the electric vehicle's range to lose more than 50%.

[0003] Currently, the refrigerant used in automobile air-conditioning systems is R134a, which has a GWP (global warming potential) of 1350. Refrigerants with a GWP value greater than 150 are defined as non-environmentally friendly refrigerants and are restricted for use in many countries and regions.

[0004] The electric vehicles currently in mass production are all based on the R134a heat pump heating architecture, such as Figure 1 As shown, the thermal system mainly includes:

[0005] 1) Battery thermal management: power battery → expansion kettle → electronic water pump → WPTC → chiller → power battery. WPTC (a positive temperature coefficient semiconductor element that heats the battery coolant) provides a heat source for the battery, and the chiller is coupled into the vehicle refrigerant circuit to provide a cold source for the battery.

[0006] 2) Thermal management of passenger compartment: compressor → internal condenser → EXV → outdoor heat exchanger → air conditioning main unit and chiller → gas-liquid separator → compressor.

[0007] The battery exchanges heat with the refrigerant through the battery coolant, and the passenger compartment cooling is coupled with the battery cooling. When the battery is heated, the WPTC consumes electric energy to heat the battery coolant to achieve heating. When the passenger compartment is heated, the refrigerant absorbs heat from the external environment and dissipates the heat to the passenger compartment through the internal condenser to achieve heating of the passenger compartment.

[0008] The disadvantages of R134a heat pump heating architecture are:

[0009] 1) The GWP value of R134a refrigerant is too high and is defined as a non-environmentally friendly refrigerant.

[0010] 2) Since the standard boiling point of R134a is -26.5℃, passenger compartment heating is only suitable for use in environments of -10℃ and above, and the operating temperature range is too small.

[0011] 3) When a single battery is used for cooling, a heat pump cannot be used for heating, and the energy consumption is relatively high.

[0012] 4) The heat generated by other heat-generating components of the vehicle, such as the motor, motor controller, high-voltage power supply, etc., cannot be recycled, resulting in large heat loss of the vehicle.

[0013] R290 refrigerant is considered to be an environmentally friendly refrigerant due to its GWP value of 3. A four-way reversing valve thermal system architecture based on R290 environmentally friendly refrigerant has been proposed. Figure 2 As shown in the figure, the thermal system architecture mainly includes HVAC (integrated air conditioning main unit), which is installed inside the instrument panel of the passenger compartment. The HVAC contains internal cooling (for heat dissipation), internal heat exchanger, four-way reversing valve (for changing the direction of refrigerant), compressor (for the flow of refrigerant), and external heat exchanger (for heat absorption or heat dissipation). The specific refrigerant flow direction and function are broken down as follows:

[0014] 1) Vehicle refrigeration: compressor → four-way valve → external heat exchanger (heat dissipation) → internal cooling → internal heat exchanger (refrigeration) → four-way valve → gas-liquid separator → compressor.

[0015] 2) Vehicle heating: compressor → four-way valve → internal heat exchanger (heat dissipation) → internal cooling (heat dissipation) → external heat exchanger (heat absorption) → four-way valve → gas-liquid separator → compressor.

[0016] The disadvantages of this thermal system architecture are:

[0017] 1) Environmentally friendly refrigerant R290 (propane) is a flammable refrigerant. If it is directly introduced into the cab, there is a high risk of fire after leakage.

[0018] 2) It is impossible to reasonably utilize the heat from other heat-generating components of the vehicle, such as the motor and motor controller, resulting in large heat losses in the vehicle.

[0019] 3) The thermal system is relatively dispersed, and the distance between the compressor (located in the engine compartment) and the HVAC (located in the passenger compartment) is relatively far. A large amount of refrigerant R290 needs to be filled, and the concentration after leakage is too high, resulting in a high risk of explosion. Summary of the invention

[0020] The purpose of the present invention is to provide a full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant, so as to solve the problems that the current automobile air-conditioning refrigerant R134a is not environmentally friendly, the waste heat of components such as motors and motor controllers cannot be utilized, the heat loss of the whole vehicle is large, the existing heat pump system has a narrow heating temperature range (>-10°C), the risk of R290 refrigerant leaking into the passenger compartment and burning, the thermal system is miniaturized, and the amount of R290 refrigerant added is reduced.

[0021] To achieve the above objectives, this application is implemented through the following technical solutions:

[0022] A full-temperature vehicle thermal system architecture based on R290 environmentally friendly refrigerant includes a compressor, the compressor outlet is connected to the LCC condenser inlet through a pipeline, the LCC condenser first outlet is connected to the WPTC inlet through a pipeline, and the WPTC outlet is respectively connected to the water pump H inlet and the first inlet of the second four-way valve through pipelines.

[0023] The outlet of the water pump H is connected to the inlet of the heating core in the HVAC through a pipeline, and the outlet of the heating core is connected to the inlet of the LCC condenser through a pipeline.

[0024] The first outlet of the second four-way valve is connected to the inlet of the second three-way valve through a pipeline, the first outlet and the second outlet of the second three-way valve are both connected to the inlet of the water pump M through a pipeline, the outlet of the water pump M is connected to the first inlet of the first four-way valve through a pipeline, the first outlet of the first four-way valve is connected to the inlet of the first three-way valve through a pipeline, the first outlet of the first three-way valve is connected to the inlet of the LCC condenser through a pipeline, and the second outlet of the first three-way valve is connected to the first inlet of the second four-way valve through a pipeline;

[0025] The second outlet of the LCC condenser is connected to the inlet of the liquid storage tank through a pipeline, and the outlet of the liquid storage tank is connected to the first inlet of chiller 1 and the first inlet of chiller 2 through pipelines respectively, and the first outlet of chiller 1 and the first outlet of chiller 2 are both connected to the inlet of the compressor through pipelines.

[0026] The air conditioning water pump inlet is connected to the second outlet of chiller1 through a pipeline, the air conditioning water pump outlet is connected to the EVAP evaporator inlet of HVAC through a pipeline, and the EVAP evaporator outlet is connected to the second inlet of chiller1 through a pipeline;

[0027] The outlet of water pump B is connected to the inlet of battery HVB through a pipeline, the outlet of battery HVB is connected to the second inlet of the first four-way valve through a pipeline, the second outlet of the first four-way valve is connected to the second inlet of chiller2 through a pipeline, the second outlet of chiller2 is connected to the second inlet of the second four-way valve through a pipeline, and the second outlet of the second four-way valve is connected to the inlet of water pump B through a pipeline.

[0028] Further, the second outlet of the second three-way valve is connected to the inlet of the fan heat exchanger through a pipeline, the outlet of the fan heat exchanger is connected to the inlet of the LTR through a pipeline, and the outlet of the LTR is connected to the inlet of the water pump M through a pipeline.

[0029] Further, it includes a refrigerant circulation loop, an air conditioning water circulation loop, a vehicle water circulation loop and a battery water circulation loop;

[0030] The refrigerant circulation circuit includes a compressor, an LCC condenser, a liquid receiver, chiller 1 and chiller 2;

[0031] The air conditioning water circulation loop includes an air conditioning water pump, an HVAC internal EVAP evaporator and chiller1;

[0032] The vehicle water circulation loop includes an LCC condenser, a WPTC, a water pump H, an HVAC internal heating core, a first four-way valve, a second four-way valve, a first three-way valve, a second three-way valve, a fan heat exchanger, an LTR, a water pump M, a water pump B, a battery HVB, and a motor and an electronic control;

[0033] The battery water circulation loop includes a water pump B, a battery HVB, a first four-way valve, a chiller 2 and a second four-way valve.

[0034] Further, including passenger compartment + battery cooling mode:

[0035] The refrigerant circulation direction is: electric compressor → LCC condenser → liquid receiver → chiller 1 and chiller 2 → compressor;

[0036] The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1;

[0037] The water circulation direction of the whole vehicle is: LCC condenser → WPTC → the first inlet of the second four-way valve → the first inlet of the second three-way valve → LTR → water pump M → motor → the first inlet of the first four-way valve → the inlet of the first three-way valve → LCC condenser;

[0038] The battery water circulation direction is: water pump B→power battery HVB→second inlet of first four-way valve→second outlet of first four-way valve→chiller→second inlet of second four-way valve→second outlet of second four-way valve→water pump B.

[0039] Further, including passenger compartment + battery heat pump heating mode:

[0040] The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1 → compressor;

[0041] The direction of vehicle water circulation + battery water circulation is:

[0042] 1) LCC condenser → WPTC → second four-way valve first inlet → second four-way valve second outlet → water pump B → battery HVB → first four-way valve second inlet → first four-way valve first outlet → first three-way valve inlet → LCC condenser;

[0043] 2) Water pump M → motor electronic control → first inlet of the first four-way valve → second outlet of the first four-way valve → chiller2 → second inlet of the second four-way valve → inlet of the second three-way valve → LTR → water pump M;

[0044] 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

[0045] Further, including battery cooling mode:

[0046] The water circulation direction is: water pump B→battery HVB→second inlet of the first four-way valve→inlet of the first three-way valve→first inlet of the second four-way water valve→inlet of the second three-way valve→LTR→water pump M→motor→first inlet of the first four-way valve→second outlet of the first four-way valve→chiller2→second inlet of the second four-way valve→second outlet of the second four-way valve→water pump B.

[0047] Furthermore, it includes battery heating waste heat recovery mode:

[0048] The water circulation direction is: water pump B→battery HVB→second inlet of the first four-way valve→inlet of the first three-way valve→first inlet of the second four-way valve→first outlet of the second three-way water valve→water pump M→motor→first inlet of the first four-way valve→second outlet of the first four-way valve→chiller2→second inlet of the second four-way valve→second outlet of the second four-way valve→water pump B.

[0049] Further, including heat pump + passenger compartment hot air dehumidification + battery heating mode:

[0050] The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1&chiller2 → compressor;

[0051] The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1;

[0052] The direction of vehicle water circulation + battery water circulation is:

[0053] 1) LCC condenser → first inlet of second four-way valve → second outlet of second four-way valve → water pump B → battery HVB → second inlet of first four-way valve → inlet of first three-way valve → LCC condenser;

[0054] 2) Water pump M → motor electronic control → first inlet of the first four-way valve → second outlet of the first four-way valve → chiller2 → second inlet of the second four-way valve → inlet of the second three-way water valve → LTR → water pump M;

[0055] 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

[0056] Further, including heat pump + passenger compartment hot air dehumidification + battery cooling mode:

[0057] The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1&chiller2 → compressor;

[0058] The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1;

[0059] The direction of vehicle water circulation + battery water circulation is:

[0060] 1) Water pump B → battery HVB → second inlet of the first four-way water valve → second outlet of the first four-way water valve → chiller2 → second inlet of the second four-way water valve → second outlet of the second four-way water valve → water pump B;

[0061] 2) Water pump M → motor electronic control → first inlet of the first four-way valve → first three-way inlet → LCC condenser → WPTC → first inlet of the second four-way valve → second three-way inlet → LTR → water pump M;

[0062] 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

[0063] Furthermore, it includes vehicle and battery heating modes at extremely low temperatures:

[0064] The direction of vehicle water circulation + battery water circulation is: WPTC→first inlet of second four-way water valve→second outlet of second four-way water valve→water pump B→battery HVB→second inlet of first four-way water valve→inlet of first three-way water valve→LCC condenser→WPTC.

[0065] Compared with the prior art, the present invention has the following beneficial effects:

[0066] This technical solution uses R290 environmentally friendly refrigerant, prevents flammable refrigerant from entering the passenger compartment through the air-conditioning water circulation loop, and can achieve full-temperature thermal management. It can effectively utilize the heat of various heat-generating components of the vehicle, effectively reduce the heat loss of the vehicle, and use the waste heat of the motor to heat the passenger compartment and battery in spring and autumn (-5 to 20°C), thereby reducing energy consumption. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 This is a schematic diagram of the current R134a heat pump heating architecture.

[0068] Figure 2 This is a schematic diagram of the thermal system architecture of the four-way reversing valve based on R290 environmentally friendly refrigerant.

[0069] Figure 3 This is a schematic diagram of the full-temperature-range vehicle thermal system architecture based on R290 environmentally friendly refrigerant in the present invention.

[0070] Figure 4 Schematic diagram of the refrigerant circulation circuit.

[0071] Figure 5It is a schematic diagram of the air conditioning water circulation loop and the vehicle water circulation loop.

[0072] Figure 6 Schematic diagram of the battery water circulation loop.

[0073] Figure 7 Schematic diagram of passenger compartment + battery cooling mode.

[0074] Figure 8 Schematic diagram of passenger compartment + battery heat pump heating mode.

[0075] Fig. 9 Schematic diagram of battery cooling mode.

[0076] Fig.10 Schematic diagram of waste heat recovery mode for battery heating.

[0077] Fig.11 This is a schematic diagram of the heat pump + passenger compartment hot air dehumidification + battery heating mode.

[0078] Fig.12 Schematic diagram of heat pump + passenger cabin hot air dehumidification + battery cooling mode.

[0079] Fig.13 Schematic diagram of vehicle and battery heating mode under extremely low temperatures.

[0080] Description of reference numerals: DETAILED DESCRIPTION

[0081] The technical solution of the present invention is described in detail below in conjunction with the accompanying drawings. The following embodiments are merely exemplary and can only be used to explain and illustrate the technical solution of the present invention, but cannot be construed as limiting the technical solution of the present invention.

[0082] like Figure 3 As shown in the figure, this technical solution is a vehicle thermal system architecture based on the full temperature range of R290 environmentally friendly refrigerant. By adding two four-way valves and two three-way valves, the vehicle integrated thermal system architecture can be realized, which can absorb heat from the air, recover waste heat from heating components such as motors, and use WPTC to release heat at extremely low temperatures. The vehicle thermal management realizes full temperature range coverage.

[0083] A full-temperature-range vehicle thermal system architecture based on R290 environmentally friendly refrigerant includes a compressor, wherein the compressor outlet is connected to the LCC condenser inlet through a pipeline, the LCC condenser first outlet is connected to the WPTC inlet through a pipeline, and the WPTC outlet is respectively connected to the water pump H inlet and the first inlet of the second four-way valve through pipelines.

[0084] The outlet of the water pump H is connected to the inlet of the heating core in the HVAC through a pipeline, and the outlet of the heating core is connected to the inlet of the LCC condenser through a pipeline.

[0085] The first outlet of the second four-way valve is connected to the inlet of the second three-way valve through a pipeline, the first outlet and the second outlet of the second three-way valve are both connected to the inlet of the water pump M through a pipeline, the outlet of the water pump M is connected to the first inlet of the first four-way valve through a pipeline, the first outlet of the first four-way valve is connected to the inlet of the first three-way valve through a pipeline, the first outlet of the first three-way valve is connected to the inlet of the LCC condenser through a pipeline, and the second outlet of the first three-way valve is connected to the first inlet of the second four-way valve through a pipeline.

[0086] The second outlet of the LCC condenser is connected to the inlet of the liquid storage tank through a pipeline, the outlet of the liquid storage tank is connected to the first inlet of chiller1 and the first inlet of chiller2 through pipelines respectively, and the first outlet of chiller1 and the first outlet of chiller2 are both connected to the inlet of the compressor through pipelines.

[0087] The air conditioning water pump inlet is connected to the second outlet of chiller1 through a pipeline, the air conditioning water pump outlet is connected to the EVAP evaporator inlet of HVAC through a pipeline, and the EVAP evaporator outlet is connected to the second inlet of chiller1 through a pipeline.

[0088] The outlet of water pump B is connected to the inlet of battery HVB through a pipeline, the outlet of battery HVB is connected to the second inlet of the first four-way valve through a pipeline, the second outlet of the first four-way valve is connected to the second inlet of chiller2 through a pipeline, the second outlet of chiller2 is connected to the second inlet of the second four-way valve through a pipeline, and the second outlet of the second four-way valve is connected to the inlet of water pump B through a pipeline.

[0089] The second outlet of the second three-way valve is connected to the inlet of the fan heat exchanger through a pipeline, the outlet of the fan heat exchanger is connected to the inlet of the LTR through a pipeline, and the outlet of the LTR is connected to the inlet of the water pump M through a pipeline.

[0090] like Figures 4 to 6 As shown, the thermal system architecture of the present application mainly includes four circulation loops, namely, a refrigerant circulation loop, an air-conditioning water circulation loop, a vehicle circulation water loop and a battery water loop.

[0091] like Figure 4 As shown in the blue line part, the refrigerant circulation loop includes a compressor, an LCC condenser (a liquid condenser is used to dissipate heat), a liquid storage tank, chiller 1 (passenger compartment cooling) and chiller 2 (battery HVB cooling). The refrigerant circuit of this technical solution is completely separated from the passenger compartment, which can miniaturize the refrigerant side and reduce the refrigerant charge. That is, in this application, the compressor is integrated with chiller 1, LCC, etc. to reduce piping and reduce the amount of flammable refrigerant charged.

[0092] like Figure 5As shown in the green line, the refrigerant evaporates and absorbs heat inside chiller 1, cooling the liquid (ethylene glycol and water) in the cooling circuit and then bringing it to the EVAP evaporator inside the HVAC through the water pump to cool the passenger compartment air, thus achieving the purpose of cooling. The main function of the cooling circuit is to transfer cold energy and prevent flammable refrigerant from entering the passenger compartment. The air conditioning water circulation circuit includes the air conditioning water pump, the EVAP evaporator inside the HVAC, and chiller 1.

[0093] like Figure 5 The black line part shows the vehicle water circulation loop, which is mainly used for passenger compartment heating, battery heating, battery cooling, battery cooling, motor point control loop cooling, motor electronic control loop heat recovery, etc. The vehicle water circulation loop includes LCC condenser, WPTC, water pump H, HVAC internal heating core, first four-way valve, second four-way valve, first three-way valve, second three-way valve, fan heat exchanger, LTR (low temperature radiator, mainly used to absorb heat from the air or dissipate heat), water pump M, water pump B, battery HVB and motor electronic control and other components.

[0094] like Figure 6 As shown in the red line part, its main function is to provide thermal management for the battery. The battery water circulation loop includes water pump B, battery HVB, the first four-way valve, chiller2 and the second four-way valve.

[0095] The thermal system architecture of this application has 15 working modes, corresponding to different vehicle usage scenarios, and achieves full-temperature heating by switching between heat pump (ambient temperature ≥ -20°C) heating and WPTC heating (ambient temperature < -20°C). The 15 working modes will be introduced below.

[0096] like Figure 7 The solid line part shows the passenger compartment + battery cooling mode:

[0097] The refrigerant circulation direction is: electric compressor → LCC condenser → liquid receiver → chiller 1 and chiller 2 → compressor; among them, the LCC condenser transfers heat to the vehicle water circulation circuit.

[0098] The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1.

[0099] The water circulation direction of the whole vehicle is: LCC condenser → WPTC → first inlet of the second four-way valve → first inlet of the second three-way valve → LTR → water pump M → motor → first inlet of the first four-way valve → inlet of the first three-way valve → LCC condenser.

[0100] The battery water circulation direction is: water pump B→power battery HVB→second inlet of first four-way valve→second outlet of first four-way valve→chiller→second inlet of second four-way valve→second outlet of second four-way valve→water pump B.

[0101] The heat from the passenger compartment and power battery is transferred to the refrigerant cycle through the air-conditioning water cycle, the refrigerant cycle is transferred to the vehicle water cycle through the LCC condenser, and the vehicle water cycle transfers the heat to the air through the LTR, thereby achieving cooling of the battery and passenger compartment and cooling of the motor electronic control circuit.

[0102] like Figure 8 The solid line part shows the passenger compartment + battery heat pump heating mode:

[0103] The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1 → compressor.

[0104] Air conditioning water circulation: not working.

[0105] The direction of vehicle water circulation + battery water circulation is:

[0106] 1) LCC condenser → WPTC (not in operation) → first inlet of second four-way valve → second outlet of second four-way valve → water pump B → battery HVB → second inlet of first four-way valve → first outlet of first four-way valve → inlet of first three-way valve → LCC condenser;

[0107] 2) Water pump M → motor electronic control → first inlet of the first four-way valve → second outlet of the first four-way valve → chiller2 → second inlet of the second four-way valve → inlet of the second three-way valve → LTR → water pump M;

[0108] 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

[0109] The LCC condenser transfers the heat from the refrigerant side to the water circulation loop. The heated hot water flows into the heater core to heat the passenger compartment. The heat from the motor control is absorbed by chiller2 and enters the refrigerant circulation. The cold water cooled by chiller2 enters the LTR to absorb heat from the air. The heat in the refrigerant circuit is transferred from the LCC condenser to the water circulation circuit, and the entire circuit forms a closed loop.

[0110] like Fig. 9 The solid line part shows the battery cooling mode (using the natural environment to dissipate heat, without the intervention of refrigerant):

[0111] Refrigerant cycle: No action.

[0112] Air conditioning water circulation: not working.

[0113] The water circulation direction is: water pump B→battery HVB→second inlet of the first four-way valve→inlet of the first three-way valve→first inlet of the second four-way water valve→inlet of the second three-way valve→LTR→water pump M→motor→first inlet of the first four-way valve→second outlet of the first four-way valve→chiller2→second inlet of the second four-way valve→second outlet of the second four-way valve→water pump B.

[0114] When the external ambient temperature is low and the battery generates too much heat during fast charging, this cycle can be enabled to transfer the battery heat into the air through the LTR, achieving cooling without increasing energy consumption.

[0115] like Fig.10 The solid line part shows the battery heating waste heat recovery mode:

[0116] Refrigerant cycle: No action.

[0117] Air conditioning water circulation: not working.

[0118] The water circulation direction is: water pump B→battery HVB→second inlet of the first four-way valve→inlet of the first three-way valve→first inlet of the second four-way valve→first outlet of the second three-way water valve→water pump M→motor→first inlet of the first four-way valve→second outlet of the first four-way valve→chiller2→second inlet of the second four-way valve→second outlet of the second four-way valve→water pump B.

[0119] When the ambient temperature is about 0°C and the vehicle is traveling at high speed, the waste heat from the motor and electronic control can be used to heat the battery HVB, avoiding waste of motor heat and reducing heat loss of the entire vehicle.

[0120] like Fig.11 The solid line part shows the heat pump + passenger compartment hot air dehumidification + battery heating mode:

[0121] The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1&chiller2 → compressor;

[0122] The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1;

[0123] The direction of vehicle water circulation + battery water circulation is:

[0124] 1) LCC condenser → WPTC (not in operation) → first inlet of the second four-way valve → second outlet of the second four-way valve → water pump B → battery HVB → second inlet of the first four-way valve → inlet of the first three-way valve → LCC condenser;

[0125] 2) Water pump M → motor electronic control → first inlet of the first four-way valve → second outlet of the first four-way valve → chiller2 → second inlet of the second four-way valve → inlet of the second three-way water valve → LTR → water pump M;

[0126] 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

[0127] Dehumidification requires the evaporator to cool and dehumidify, and the air conditioning refrigeration circuit is involved.

[0128] like Fig.12 The solid line part shows the heat pump + passenger compartment hot air dehumidification + battery cooling mode:

[0129] The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1&chiller2 → compressor.

[0130] The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1.

[0131] The direction of vehicle water circulation + battery water circulation is:

[0132] 1) Water pump B → battery HVB → second inlet of the first four-way water valve → second outlet of the first four-way water valve → chiller 2 → second inlet of the second four-way water valve → second outlet of the second four-way water valve → water pump B.

[0133] 2) Water pump M → motor and electronic control → first inlet of the first four-way valve → first three-way inlet → LCC condenser → WPTC → first inlet of the second four-way valve → second three-way inlet → LTR → water pump M.

[0134] 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

[0135] Battery cooling is achieved by chiller2 cooling the battery coolant, the motor electronic control waste heat enters the heater core to heat the passenger compartment, and the air conditioning water circulation loop provides dehumidification and cooling for the passenger compartment.

[0136] like Fig.13 The solid line part shows the vehicle and battery heating mode at extremely low temperatures:

[0137] Refrigerant cycle: No action.

[0138] Air conditioning water circulation: not working.

[0139] The direction of vehicle water circulation + battery water circulation is: WPTC→first inlet of second four-way water valve→second outlet of second four-way water valve→water pump B→battery HVB→second inlet of first four-way water valve→inlet of first three-way water valve→LCC condenser→WPTC.

[0140] When the ambient temperature is less than -20℃, the refrigerant is unable to generate heat due to its physical properties, and WPTC needs to intervene. WPTC heats the water circulation to achieve heating of the passenger compartment and the battery.

[0141] The above are preferred implementation modes of the present invention. The above show and describe the basic principles of the present invention and the advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are only for illustrating the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements shall fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A full-temperature vehicle thermal system architecture based on R290 environmentally friendly refrigerant, characterized in that: It includes a compressor, the compressor outlet is connected to the LCC condenser inlet through a pipeline, the LCC condenser first outlet is connected to the WPTC inlet through a pipeline, and the WPTC outlet is connected to the water pump H inlet and the first inlet of the second four-way valve through pipelines. The outlet of the water pump H is connected to the inlet of the heating core in the HVAC through a pipeline, and the outlet of the heating core is connected to the inlet of the LCC condenser through a pipeline. The first outlet of the second four-way valve is connected to the inlet of the second three-way valve through a pipeline, the first outlet and the second outlet of the second three-way valve are both connected to the inlet of the water pump M through a pipeline, the outlet of the water pump M is connected to the first inlet of the first four-way valve through a pipeline, the first outlet of the first four-way valve is connected to the inlet of the first three-way valve through a pipeline, the first outlet of the first three-way valve is connected to the inlet of the LCC condenser through a pipeline, and the second outlet of the first three-way valve is connected to the first inlet of the second four-way valve through a pipeline; The second outlet of the LCC condenser is connected to the inlet of the liquid storage tank through a pipeline, and the outlet of the liquid storage tank is connected to the first inlet of chiller 1 and the first inlet of chiller 2 through pipelines respectively, and the first outlet of chiller 1 and the first outlet of chiller 2 are both connected to the inlet of the compressor through pipelines. The air conditioning water pump inlet is connected to the second outlet of chiller1 through a pipeline, the air conditioning water pump outlet is connected to the EVAP evaporator inlet of HVAC through a pipeline, and the EVAP evaporator outlet is connected to the second inlet of chiller1 through a pipeline; The outlet of water pump B is connected to the inlet of battery HVB through a pipeline, the outlet of battery HVB is connected to the second inlet of the first four-way valve through a pipeline, the second outlet of the first four-way valve is connected to the second inlet of chiller2 through a pipeline, the second outlet of chiller2 is connected to the second inlet of the second four-way valve through a pipeline, and the second outlet of the second four-way valve is connected to the inlet of water pump B through a pipeline.

2. The full-temperature vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 1 is characterized in that: The second outlet of the second three-way valve is connected to the inlet of the fan heat exchanger through a pipeline, the outlet of the fan heat exchanger is connected to the inlet of the LTR through a pipeline, and the outlet of the LTR is connected to the inlet of the water pump M through a pipeline.

3. The full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 2 is characterized in that: Including refrigerant circulation loop, air conditioning water circulation loop, vehicle water circulation loop and battery water circulation loop; The refrigerant circulation circuit includes a compressor, an LCC condenser, a liquid receiver, chiller 1 and chiller 2; The air conditioning water circulation loop includes an air conditioning water pump, an HVAC internal EVAP evaporator and chiller1; The vehicle water circulation loop includes an LCC condenser, a WPTC, a water pump H, an HVAC internal heating core, a first four-way valve, a second four-way valve, a first three-way valve, a second three-way valve, a fan heat exchanger, an LTR, a water pump M, a water pump B, a battery HVB, and a motor and an electronic control; The battery water circulation loop includes a water pump B, a battery HVB, a first four-way valve, a chiller 2 and a second four-way valve.

4. The full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 3 is characterized in that: Including passenger compartment + battery cooling mode: The refrigerant circulation direction is: electric compressor → LCC condenser → liquid receiver → chiller 1 and chiller 2 → compressor; The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1; The water circulation direction of the whole vehicle is: LCC condenser → WPTC → the first inlet of the second four-way valve → the first inlet of the second three-way valve → LTR → water pump M → motor → the first inlet of the first four-way valve → the inlet of the first three-way valve → LCC condenser; The battery water circulation direction is: water pump B→power battery HVB→second inlet of first four-way valve→second outlet of first four-way valve→chiller→second inlet of second four-way valve→second outlet of second four-way valve→water pump B.

5. The full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 3 is characterized in that: Including passenger compartment + battery heat pump heating mode: The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1 → compressor; The direction of vehicle water circulation + battery water circulation is: 1) LCC condenser → WPTC → second four-way valve first inlet → second four-way valve second outlet → water pump B → battery HVB → first four-way valve second inlet → first four-way valve first outlet → first three-way valve inlet → LCC condenser; 2) Water pump M → motor electronic control → first inlet of the first four-way valve → second outlet of the first four-way valve → chiller2 → second inlet of the second four-way valve → inlet of the second three-way valve → LTR → water pump M; 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

6. The full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 3 is characterized in that: Includes battery cooling mode: The water circulation direction is: water pump B→battery HVB→second inlet of the first four-way valve→inlet of the first three-way valve→first inlet of the second four-way water valve→inlet of the second three-way valve→LTR→water pump M→motor→first inlet of the first four-way valve→second outlet of the first four-way valve→chiller2→second inlet of the second four-way valve→second outlet of the second four-way valve→water pump B.

7. The full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 3 is characterized in that: Including battery heating waste heat recovery mode: The water circulation direction is: water pump B→battery HVB→second inlet of the first four-way valve→inlet of the first three-way valve→first inlet of the second four-way valve→first outlet of the second three-way water valve→water pump M→motor→first inlet of the first four-way valve→second outlet of the first four-way valve→chiller2→second inlet of the second four-way valve→second outlet of the second four-way valve→water pump B.

8. The full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 3 is characterized in that: Including heat pump + passenger compartment hot air dehumidification + battery heating mode: The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1&chiller2 → compressor; The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1; The direction of vehicle water circulation + battery water circulation is: 1) LCC condenser → first inlet of second four-way valve → second outlet of second four-way valve → water pump B → battery HVB → second inlet of first four-way valve → inlet of first three-way valve → LCC condenser; 2) Water pump M → motor electronic control → first inlet of the first four-way valve → second outlet of the first four-way valve → chiller2 → second inlet of the second four-way valve → inlet of the second three-way water valve → LTR → water pump M; 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

9. The full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 3 is characterized in that: Including heat pump + passenger compartment hot air dehumidification + battery cooling mode: The refrigerant circulation direction is: compressor → LCC condenser → liquid receiver → chiller1&chiller2 → compressor; The air conditioning water circulation direction is: chiller1→air conditioning water pump→EVAP evaporator→chiller1; The direction of vehicle water circulation + battery water circulation is: 1) Water pump B → battery HVB → second inlet of the first four-way water valve → second outlet of the first four-way water valve → chiller2 → second inlet of the second four-way water valve → second outlet of the second four-way water valve → water pump B; 2) Water pump M → motor electronic control → first inlet of the first four-way valve → first three-way inlet → LCC condenser → WPTC → first inlet of the second four-way valve → second three-way inlet → LTR → water pump M; 3) LCC condenser → WPTC → water pump H → heater core → LCC condenser.

10. The full-temperature range vehicle thermal system architecture based on R290 environmentally friendly refrigerant according to claim 3 is characterized in that: Including vehicle and battery heating modes at extremely low temperatures: The direction of vehicle water circulation + battery water circulation is: WPTC→first inlet of second four-way water valve→second outlet of second four-way water valve→water pump B→battery HVB→second inlet of first four-way water valve→inlet of first three-way water valve→LCC condenser→WPTC.

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