Extended-range vehicle thermal management system and method

Abstract

The invention relates to a heat management system and method for a range-extended vehicle. The heat management system for the range-extended vehicle comprises a range extender cooling loop and a heat pump air conditioner loop which are connected through a plate heat exchanger. The heat pump air conditioner loop is used for providing a refrigerating and / or heating function for the extended-range vehicle and comprises a gas-liquid separator, a compressor, an external condensation evaporator, a first electronic expansion valve one-way valve assembly, a second electronic expansion valve one-way valve assembly, an internal condensation evaporator and a power battery pack. The second end of the external condensation evaporator is connected with the second end of the internal condensation evaporator through the first electronic expansion valve one-way valve assembly, the four-way pipe, the fourth proportional three-way valve and the second electronic expansion valve one-way valve assembly in sequence. According to the extended-range vehicle, by installing the extended-range vehicle heat management system architecture, waste heat isolation of the range extender during refrigeration is achieved, the waste heat transfer and utilization efficiency during heating is improved, and the endurance mileage and the use experience in extreme environments such as severe cold or intense summer heat are improved.

Description

Technical Field

[0001] The embodiments of the present invention relate to the field of thermal management of extended-range vehicles, and more particularly to a thermal management system and method for extended-range vehicles. Background Art

[0002] In the modern automobile industry, extended-range electric vehicles (EREVs), as a hybrid vehicle that combines a traditional internal combustion engine and an electric motor, have gradually become the focus of market attention. EREVs provide driving force through a built-in pure electric motor, while a small internal combustion engine (also known as a range extender) with fuel installed inside is used to generate electricity for the power battery to extend the discharge of the power battery and increase the vehicle's range.

[0003] The existing EREV thermal management system usually uses a PTC (Positive Temperature Coefficient) heater to heat the passenger compartment and power battery. When the vehicle starts the heating mode, if the range extender is started, the warm air coolant circuit is generally used to incorporate the waste heat generated by the range extender into the thermal management system to achieve waste heat recovery. However, when the vehicle is in pure electric mode, the range extender is in the off state. In this case, the thermal management system can only use a PTC (Positive Temperature Coefficient) heater for heating. Under this condition, the heat conversion rate is low, 1 kilowatt (kW) of electrical energy can only be converted into 1 kilowatt of heat energy, the energy efficiency is low, and the vehicle's endurance in low temperature environments in pure electric mode is poor, which will increase customers' range anxiety. Summary of the invention

[0004] In view of the above-mentioned deficiencies or shortcomings, the present application provides a range-extended vehicle thermal management system and method. By installing the range-extended vehicle thermal management system architecture of the present application, the range-extended vehicle achieves waste heat isolation of the range extender during cooling, improves the waste heat transfer and utilization efficiency during heating, and improves the cruising range and user experience in extreme environments such as severe cold or extreme heat.

[0005] According to a first aspect, the present application provides a range-extended vehicle thermal management system, the range-extended vehicle thermal management system comprising a range-extended vehicle cooling circuit and a heat pump air-conditioning circuit connected via a plate heat exchanger; the heat pump air-conditioning circuit is used to provide cooling and / or heating functions for a passenger compartment and a power battery pack;

[0006] The heat pump air conditioning circuit includes a gas-liquid separator, a compressor, an external condenser evaporator, a first EXV (Electronic Expansion Valve) one-way valve assembly, a second EXV one-way valve assembly, a built-in condenser evaporator, and a power battery pack;

[0007] The outlet of the gas-liquid separator is connected to the inlet of the compressor, and the outlet of the compressor is connected to the first end of the built-in condenser evaporator through the second proportional three-way valve and the third proportional three-way valve in sequence, and the outlet of the compressor is also connected to the first end of the external condenser evaporator through the second proportional three-way valve and the first three-way pipe in sequence;

[0008] The second end of the external condenser evaporator is connected to the second end of the internal condenser evaporator through the first EXV one-way valve assembly, the four-way pipe, the fourth proportional three-way valve, and the second EXV one-way valve assembly in sequence;

[0009] The first end and the second end of the plate heat exchanger are respectively connected to a fourth proportional three-way valve and a four-way pipe;

[0010] The first end of the power battery pack is connected to the four-way pipe through the EXV, and the second end is connected to the inlet of the gas-liquid separator through the third three-way pipe and the second three-way pipe in sequence;

[0011] The second three-way pipe is also connected to the third proportional three-way valve, and the third three-way pipe is also connected to the first three-way pipe.

[0012] In some embodiments, the range extender cooling circuit includes an electronic water pump, a main water pump, a first proportional three-way valve, a radiator, a thermostat, a cylinder head water jacket and a cylinder block water jacket that are interconnected, a waste recirculation cooling device, and a plurality of expansion water tanks;

[0013] The third end of the plate heat exchanger passes through the fourth three-way pipe connected to the water outlet of the electronic water pump, the third end of the first proportional three-way valve to the first end, and then is connected to the fourth end of the plate heat exchanger;

[0014] The fourth three-way pipe is connected to the first water inlet of the main water pump through the sixth three-way pipe, and the water outlet of the main water pump is connected to the water inlet of the cylinder water jacket and the water inlet of the waste recirculation cooling device through the fifth three-way pipe;

[0015] The first water outlet of the cylinder head water jacket is connected to the second end of the first proportional three-way valve, the second water outlet is connected to the water inlet of the thermostat, and the third water outlet is connected to a type of water inlet of each expansion water tank;

[0016] The first water outlet of the thermostat is connected to the radiator, the first water outlet of the radiator is connected to the second water inlet of the main water pump, the second water outlet of the thermostat is connected to the third water inlet of the main water pump, and the second water outlet of the radiator is connected to the second type of water inlet of each expansion water tank;

[0017] The water outlet of the expansion water tank is connected to the sixth three-way pipe.

[0018] In some embodiments, the first EXV one-way valve assembly and the second EXV one-way valve assembly both include an electronic expansion valve EXV and a one-way valve, and the pipeline where each EXV is located is connected in parallel with the pipeline where the corresponding one-way valve is located.

[0019] In some embodiments, the range extender cooling circuit further includes a positive temperature coefficient (PTC) heater, and the PTC heater is installed between the first proportional three-way valve and the plate heat exchanger.

[0020] According to a second aspect, the present application provides a thermal management method for an extended-range vehicle, wherein the extended-range vehicle comprises the thermal management system for an extended-range vehicle as claimed in claim 4, wherein a first end of the second proportional three-way valve is connected to an outlet of a compressor, a second end is connected to a first three-way pipe, and a third end is connected to a third end of a third proportional three-way valve; a first end of the third proportional three-way valve is connected to an inlet of a gas-liquid separator, and a second end is connected to a built-in condenser evaporator; a first end of a fourth proportional three-way valve is connected to a second EXV one-way valve assembly, a second end is connected to a four-way pipe, and a third end is connected to a first end of a plate heat exchanger; and the method further comprises:

[0021] When the extended-range vehicle starts the heating mode, the second end of the second proportional three-way valve, the first end of the third proportional three-way valve and the second end of the fourth proportional three-way valve in the heat pump air-conditioning circuit are shut off, and the first end and the third end of the second proportional three-way valve, the second end and the third end of the third proportional three-way valve, and the first end and the third end of the fourth proportional three-way valve are controlled to be connected;

[0022] Close the electronic expansion valve in the second EXV one-way valve assembly, and open the electronic expansion valve in the first EXV one-way valve assembly;

[0023] Start the compressor to allow the condensate in the heat pump air conditioning circuit to flow through the plate heat exchanger to absorb the waste heat of the coolant.

[0024] In some embodiments, the above method further comprises:

[0025] When the range-extended vehicle has entered the heating mode and the range extender is working, the first end, the second end and the third end of the first proportional three-way valve are controlled to be connected to each other;

[0026] The electronic water pump and the main water pump are started to allow the coolant flowing through the cylinder head water jacket and the cylinder block water jacket to flow through the plate heat exchanger for waste heat exchange.

[0027] In some embodiments, the above method further comprises:

[0028] When the range-extended vehicle has entered the heating mode and the pure electric mode, the second end of the first proportional three-way valve is turned off, and the first end and the third end of the first proportional three-way valve are controlled to be connected;

[0029] Turn off the electronic water pump to prevent the low-temperature coolant flowing through the cylinder head water jacket and the cylinder block water jacket from flowing through the plate heat exchanger.

[0030] In some embodiments, the above method further comprises:

[0031] When the extended-range vehicle has entered the heating mode and the pure electric mode, and the ambient temperature drops to a set low temperature threshold, the second end of the first proportional three-way valve is maintained in an off state, and the first end and the third end are maintained in a conducting state;

[0032] Restart the electronic water pump and increase the duty cycle of the PTC heater to increase the coolant temperature on the plate heat exchanger side.

[0033] In some embodiments, the above method further comprises:

[0034] When the range-extended vehicle enters the cooling mode, the third end of the second proportional three-way valve, the third end of the third proportional three-way valve, and the third end of the fourth proportional three-way valve are turned off, and the first end and the second end of the second proportional three-way valve, the first end and the second end of the third proportional three-way valve, and the first end and the second end of the fourth proportional three-way valve are controlled to be connected;

[0035] Close the electronic expansion valve in the first EXV one-way valve assembly, and open the electronic expansion valve in the second EXV one-way valve assembly to prevent the condensate in the heat pump air conditioning circuit from flowing through the plate heat exchanger; start the compressor.

[0036] In some embodiments, the above method further comprises:

[0037] When the ambient temperature exceeds the set high temperature threshold, the range-extended vehicle has entered the cooling mode and the range extender is working, the second end of the first proportional three-way valve is turned off, and the second end and the third end of the first proportional three-way valve are controlled to be connected; the electronic water pump and the PTC heater are turned off;

[0038] The main water pump is turned on and the duty cycle of the radiator is increased to dissipate the coolant in the range extender cooling circuit.

[0039] According to a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any one of the above-mentioned extended-range vehicle thermal management methods when the computer program is executed by a processor.

[0040] According to a fourth aspect, the present application provides a computer device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements any of the steps of the above-mentioned extended-range vehicle thermal management method when executing the computer program.

[0041] The extended-range vehicle thermal management system of the above-mentioned embodiment can be installed in an EREV, wherein the cylinder head water jacket and the cylinder body water jacket that are interconnected are used to wrap and cool the range extender. When the driver starts the cooling mode of the EREV, the third end of the second proportional three-way valve, the third end of the third proportional three-way valve, and the third end of the fourth proportional three-way valve are first turned off, and the first end and the second end of the second proportional three-way valve itself, the first end and the second end of the third proportional three-way valve itself, and the first end and the second end of the fourth proportional three-way valve itself are controlled to be conductive. Then close the electronic expansion valve in the first EXV one-way valve assembly, open the electronic expansion valve in the second EXV one-way valve assembly, and finally start the compressor to prevent the condensing agent (which can be a hydrofluorocarbon HFCs substance) in the heat pump air conditioning circuit from flowing through the plate heat exchanger. Through such a thermal management system architecture design, the waste heat isolation of the range extender during cooling is achieved.

[0042] When the driver starts the heating mode of EREV, first shut off the second end of the second proportional three-way valve, the first end of the third proportional three-way valve and the second end of the fourth proportional three-way valve in the heat pump air conditioning circuit, and control the first end and the third end of the second proportional three-way valve itself, the second end and the third end of the third proportional three-way valve itself, and the first end and the third end of the fourth proportional three-way valve itself. Then close the electronic expansion valve in the second EXV one-way valve assembly, open the electronic expansion valve in the first EXV one-way valve assembly, and finally start the compressor, so that the condensing agent in the heat pump air conditioning circuit flows through the plate heat exchanger to absorb the waste heat of the coolant. Among them, the first end of the power battery pack is connected to the four-way pipe through the EXV. When the condensing agent flows through the EXV and the first EXV one-way valve assembly, it is depressurized and atomized (the residual condensing agent is broken into fine liquid droplets). The volume of the liquid condensing agent expands rapidly, a phase change occurs, and the temperature drops sharply, turning into a condensing agent mist mixed with gas and fine liquid droplets. At this time, since the temperature of the condenser mist is much lower than the temperature of the liquid condenser, the heat absorption efficiency of the power battery pack and the external condenser evaporator is higher, thereby improving the waste heat transfer and utilization efficiency of EREV in heating mode.

[0043] Finally, for EREVs that use the above thermal management system architecture design, when experiencing severe cold, the heating mode can be activated, which not only allows the heat pump air conditioning circuit to absorb the waste heat of the coolant on the side of the range extender cooling circuit, but also absorbs the waste heat of the power battery pack to heat the cockpit. And when the EREV experiences extreme heat, the heat exchange between the heat pump air conditioning circuit and the range extender cooling circuit is isolated, which prevents the waste heat of the range extender from entering the passenger compartment, improving the EREV's range and user experience in extreme environments such as severe cold or heat. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 A schematic diagram of a thermal management system structure of an EREV in one or more embodiments of the present application;

[0045] Figure 2 A schematic diagram of the operation of a thermal management system of an EREV in a heating mode in one or more embodiments of the present application;

[0046] Figure 3 A flow chart of a thermal management method of an EREV in a heating mode in one or more embodiments of the present application;

[0047] Figure 4 A schematic diagram of the operation of a thermal management system of an EREV in a pure electric mode and a heating mode in one or more embodiments of the present application;

[0048] Figure 5 A flow chart of a thermal management method of an EREV in a pure electric mode and a heating mode in one or more embodiments of the present application;

[0049] Figure 6 A schematic diagram of the operation of a thermal management system of an EREV in pure electric mode, heating mode and severe cold environment in one or more embodiments of the present application;

[0050] Figure 7 A schematic diagram of the operation of a thermal management system of an EREV in a cooling mode in one or more embodiments of the present application;

[0051] Figure 8 A flow chart of a thermal management method of an EREV in a heating mode in one or more embodiments of the present application;

[0052] Fig. 9 A schematic diagram of the operation of a thermal management system of an EREV in a cooling mode and a hot summer environment in one or more embodiments of the present application;

[0053] Fig.10 A schematic diagram of the structure of a computer device in one or more embodiments of the present application. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0055] According to a first aspect, the present application provides a range-extended vehicle thermal management system, the range-extended vehicle thermal management system comprising a range-extended vehicle cooling circuit and a heat pump air-conditioning circuit connected via a plate heat exchanger; the heat pump air-conditioning circuit is used to provide cooling and / or heating functions for a passenger compartment and a power battery pack;

[0056] The heat pump air conditioning circuit includes a gas-liquid separator, a compressor, an external condenser evaporator, a first EXV (Electronic Expansion Valve) one-way valve assembly, a second EXV one-way valve assembly, a built-in condenser evaporator, and a power battery pack;

[0057] The outlet of the gas-liquid separator is connected to the inlet of the compressor, and the outlet of the compressor is connected to the first end of the built-in condenser evaporator through the second proportional three-way valve and the third proportional three-way valve in sequence, and the outlet of the compressor is also connected to the first end of the external condenser evaporator through the second proportional three-way valve and the first three-way pipe in sequence;

[0058] The second end of the external condenser evaporator is connected to the second end of the internal condenser evaporator through the first EXV one-way valve assembly, the four-way pipe, the fourth proportional three-way valve, and the second EXV one-way valve assembly in sequence;

[0059] The first end and the second end of the plate heat exchanger are respectively connected to a fourth proportional three-way valve and a four-way pipe;

[0060] The first end of the power battery pack is connected to the four-way pipe through the EXV, and the second end is connected to the inlet of the gas-liquid separator through the third three-way pipe and the second three-way pipe in sequence;

[0061] The second three-way pipe is also connected to the third proportional three-way valve, and the third three-way pipe is also connected to the first three-way pipe.

[0062] For example, the above-mentioned extended-range vehicle thermal management system may be as follows: Figure 1The architecture shown in the figure, wherein the heat pump air conditioning circuit includes a gas-liquid separator, a compressor, an external condenser evaporator, an EXV1 one-way valve assembly (equivalent to the first EXV one-way valve assembly mentioned above), an EXV2 one-way valve assembly (equivalent to the second EXV one-way valve assembly mentioned above), a built-in condenser evaporator, and a power battery pack; the outlet of the gas-liquid separator is connected to the inlet of the compressor, and the outlet of the compressor is connected to the first end of the built-in condenser evaporator through proportional three-way valve 2 (equivalent to the second proportional three-way valve mentioned above) and proportional three-way valve 3 (equivalent to the third proportional three-way valve mentioned above), and the outlet of the compressor is also connected to the first end of the built-in condenser evaporator through proportional three-way valve 2 (equivalent to the second proportional three-way valve mentioned above) and proportional three-way valve 3 (equivalent to the third proportional three-way valve mentioned above). 2. The three-way pipe 1 is connected to the first end of the external condenser evaporator; the second end of the external condenser evaporator is connected to the second end of the internal condenser evaporator through the EXV1 one-way valve assembly, the four-way pipe, the proportional three-way valve 4 (equivalent to the fourth proportional three-way valve mentioned above), and the EXV2 one-way valve assembly in sequence; the first end and the second end of the refrigerant side of the plate heat exchanger are respectively connected to the proportional three-way valve 4 and the four-way pipe; the first end of the power battery pack is connected to the four-way pipe through EXV, and the second end is connected to the inlet of the gas-liquid separator through the three-way pipe 3 and the three-way pipe 2 in sequence; the three-way pipe 2 is also connected to the proportional three-way valve 3, and the three-way pipe 2 is also connected to the three-way pipe 1. The EREV equipped with this extended-range vehicle thermal management system architecture can achieve the isolation of the range extender waste heat during cooling, improve the waste heat transfer and utilization efficiency during heating, and improve the cruising range and use experience in extreme environments such as severe cold or heat.

[0063] In some embodiments, the range extender cooling circuit includes an electronic water pump, a main water pump, a first proportional three-way valve, a radiator, a thermostat, a cylinder head water jacket and a cylinder block water jacket that are interconnected, a waste recirculation cooling device, and a plurality of expansion water tanks;

[0064] The third end of the plate heat exchanger passes through the fourth three-way pipe connected to the water outlet of the electronic water pump, the third end of the first proportional three-way valve to the first end, and then is connected to the fourth end of the plate heat exchanger;

[0065] The fourth three-way pipe is connected to the first water inlet of the main water pump through the sixth three-way pipe, and the water outlet of the main water pump is connected to the water inlet of the cylinder water jacket and the water inlet of the waste recirculation cooling device through the fifth three-way pipe;

[0066] The first water outlet of the cylinder head water jacket is connected to the second end of the first proportional three-way valve, the second water outlet is connected to the water inlet of the thermostat, and the third water outlet is connected to a type of water inlet of each expansion water tank;

[0067] The first water outlet of the thermostat is connected to the radiator, the first water outlet of the radiator is connected to the second water inlet of the main water pump, the second water outlet of the thermostat is connected to the third water inlet of the main water pump, and the second water outlet of the radiator is connected to the second type of water inlet of each expansion water tank;

[0068] The water outlet of the expansion water tank is connected to the sixth three-way pipe.

[0069] For example, in Figure 1 In the extended-range vehicle thermal management system architecture shown, the range extender cooling circuit includes an electronic water pump, a main water pump, a proportional three-way valve 1 (equivalent to the first proportional three-way valve mentioned above), a radiator, a thermostat, a cylinder head water jacket and a cylinder water jacket that are interconnected, a waste recirculation cooling device, and multiple expansion water tanks; the third end of the plate heat exchanger coolant side passes through the three-way pipe 4 connected to the water outlet of the electronic water pump, the third end to the first end of the proportional three-way valve 1, and then connects to the fourth end of the plate heat exchanger coolant side; the three-way pipe 4 is connected to the first water inlet of the main water pump through the three-way pipe 6, and the water outlet of the main water pump is connected to the water inlet of the cylinder water jacket and the water inlet of the EGR (Exhaust Gas Re-circulation-Cooler) through the three-way pipe 5;

[0070] The first water outlet of the cylinder head water jacket is connected to the second end of the proportional three-way valve 1, the second water outlet is connected to the water inlet of the thermostat, and the third water outlet is connected to the first water inlet of each expansion water tank; the first water outlet of the thermostat is connected to the radiator, the first water outlet of the radiator is connected to the second water inlet of the main water pump, the second water outlet of the thermostat is connected to the third water inlet of the main water pump, and the second water outlet of the radiator is connected to the second water inlet of each expansion water tank 1; the lower water outlet of the expansion water tank 1 is connected to the three-way pipe 6. The EREV equipped with the extended-range vehicle thermal management system architecture avoids the waste heat of the range extender affecting the cooling effect during cooling by switching the flow direction of the coolant in the cooling circuit of the range extender, and realizes the transfer and utilization of waste heat during heating, improving the cruising range and user experience in extreme environments such as severe cold or heat.

[0071] In some embodiments, the first EXV one-way valve assembly and the second EXV one-way valve assembly both include an electronic expansion valve EXV and a one-way valve, and the pipeline where each EXV is located is connected in parallel with the pipeline where the corresponding one-way valve is located.

[0072] For example, in Figure 1 In the extended-range vehicle thermal management system architecture shown, the pipelines where EXV1 and EXV2 are located are connected in parallel with the pipelines where the corresponding one-way valves are located. An EREV equipped with such an EXV component design can start EXV2 to atomize the liquid refrigerant from the proportional three-way valve 4 during cooling, and at the same time close EXV1 to allow the liquid refrigerant from the external condenser evaporator to pass through the one-way valve, thereby avoiding repeated or invalid atomization processes of the liquid refrigerant and improving the transfer and utilization of waste heat. In addition, the EREV will start EXV1 to atomize the liquid refrigerant from the external condenser evaporator during heating, and at the same time close EXV2 to allow the liquid refrigerant from the proportional three-way valve 4 to pass through the one-way valve to avoid repeated or invalid atomization processes.

[0073] In some embodiments, the range extender cooling circuit further includes a positive temperature coefficient (PTC) heater, and the PTC heater is installed between the first proportional three-way valve and the plate heat exchanger.

[0074] For example, in Figure 1 In the extended-range vehicle thermal management system architecture shown, the PTC heater is installed between the proportional three-way valve 1 and the coolant side of the plate heat exchanger. For an EREV equipped with this extended-range vehicle thermal management system architecture, when the EREV has entered the heating mode and the pure electric mode, and the ambient temperature drops to the set low temperature threshold (which can be -20 degrees Celsius), the second end of the proportional three-way valve 1 is maintained in the off state, and the first and third ends are maintained in the on state; the electronic water pump is restarted, and the duty cycle of the PTC heater is increased to increase the coolant temperature on the plate heat exchanger side, which improves the use experience of the EREV in severe cold or cold environments.

[0075] According to a second aspect, the present application provides a thermal management method for an extended-range vehicle, wherein the extended-range vehicle comprises the above-mentioned Figure 1 In the extended-range vehicle thermal management system shown in FIG. 1 , the first end of the proportional three-way valve 2 is connected to the outlet of the compressor, the second end is connected to the three-way pipe 1, and the third end is connected to the third end of the proportional three-way valve 3; the first end of the proportional three-way valve 3 is connected to the inlet of the gas-liquid separator, and the second end is connected to the built-in condenser evaporator; the first end of the proportional three-way valve 4 is connected to the EXV2 one-way valve assembly, the second end is connected to the four-way pipe, and the third end is connected to the first end of the refrigerant side of the plate heat exchanger; Figure 2 , 3 As shown, the method includes:

[0076] S110: When the extended-range vehicle starts the heating mode, the second end of the second proportional three-way valve, the first end of the third proportional three-way valve and the second end of the fourth proportional three-way valve in the heat pump air-conditioning circuit are turned off, and the first end and the third end of the second proportional three-way valve, the second end and the third end of the third proportional three-way valve, and the first end and the third end of the fourth proportional three-way valve are controlled to be connected;

[0077] Specifically, the heating mode of the EREV can be manually activated by the driver, or the EREV can be automatically activated after detecting that the external ambient temperature drops to a set low temperature threshold (which can be 10 to -20 degrees Celsius).

[0078] S120: closing the electronic expansion valve in the second EXV one-way valve assembly, and opening the electronic expansion valve in the first EXV one-way valve assembly;

[0079] S130: Start the compressor to allow the condensate in the heat pump air conditioning circuit to flow through the plate heat exchanger to absorb the waste heat of the coolant.

[0080] For example, Figure 2 As shown, after the heating mode is started, the second end of the proportional three-way valve 2, the first end of the proportional three-way valve 3 and the second end of the proportional three-way valve 4 are first turned off, and the first end and the third end of the proportional three-way valve 2, the second end and the third end of the proportional three-way valve 3, and the first end and the third end of the proportional three-way valve 4 are controlled to be connected. Then close EXV2, open EXV1, and finally start the compressor to allow the condensing agent to flow through the refrigerant side of the plate heat exchanger to absorb the waste heat of the coolant. Among them, the first end of the power battery pack is connected to the four-way pipe through EXV. When the condensing agent flows through EXV and EXV1, it is depressurized and atomized. The liquid condensing agent is converted into a condensing agent mist mixed with gas and fine liquid droplets, which improves the heat absorption efficiency of the condensing agent mist to the power battery pack and the external condensing evaporator, thereby improving the waste heat transfer and utilization efficiency of EREV in the heating mode.

[0081] In some embodiments, Figure 3 As shown, the above method also includes:

[0082] S140: When the range-extended vehicle has entered the heating mode and the range extender is working, controlling the first end, the second end and the third end of the first proportional three-way valve to be connected to each other;

[0083] S150: Start the electronic water pump and the main water pump to allow the coolant flowing through the cylinder head water jacket and the cylinder block water jacket to flow through the plate heat exchanger for waste heat exchange.

[0084] For example, during the operation of the heating mode, when the EREV detects that the range extender is working, the first and second ends of the proportional three-way valve 1 are controlled to be connected to each other, and the electronic water pump and the main water pump are started to allow the coolant flowing through the cylinder head water jacket and the cylinder body water jacket to flow through the coolant side of the plate heat exchanger for waste heat exchange. At this time, the temperature of the coolant can be increased to 80 to 100 degrees Celsius. In this way, the coolant circulation heat exchange is realized when the range extender is running, and the waste heat transfer efficiency of the range extender of the EREV in the heating mode is improved.

[0085] In some embodiments, Figure 4 , 5 As shown, the above method also includes:

[0086] S210: When the extended-range vehicle has entered the heating mode and the pure electric mode, the second end of the first proportional three-way valve is turned off, and the first end and the third end of the first proportional three-way valve are controlled to be connected;

[0087] S220: Turn off the electronic water pump to prevent the low-temperature coolant flowing through the cylinder head water jacket and the cylinder block water jacket side from flowing through the plate heat exchanger.

[0088] For example, Figure 4As shown in the figure, during the operation of the heating mode, when the EREV detects that the range extender stops working and enters the pure electric mode, the second end of the proportional three-way valve 1 is turned off, and the first end and the third end of the proportional three-way valve 1 are controlled to be connected; the electronic water pump is turned off, and the temperature of the coolant can be reduced to 30 to -20 degrees Celsius. In this way, the coolant circulation isolation in the pure electric mode is achieved, and the low-temperature coolant flowing through the cylinder head water jacket and the cylinder body water jacket side is prevented from flowing through the plate heat exchanger.

[0089] In some embodiments, Figure 5 , 6 As shown, the above method also includes:

[0090] S230: When the extended-range vehicle has entered the heating mode and the pure electric mode, and the ambient temperature drops to a set low temperature threshold, maintaining the second end of the first proportional three-way valve in an off state and the first end and the third end in a conducting state;

[0091] S240: Restart the electronic water pump and increase the duty cycle of the PTC heater to increase the coolant temperature on the plate heat exchanger side.

[0092] For example, Figure 6 As shown, when the EREV is in pure electric mode and the external ambient temperature drops to the set low temperature threshold, the second end of the proportional three-way valve 1 is maintained in the off state, and the first end and the third end are maintained in the on state; the electronic water pump is restarted, and the duty cycle of the PTC heater is increased to increase the coolant temperature on the plate heat exchanger side to avoid coolant freezing, thereby improving the use experience of EREV in severe cold environments.

[0093] In some embodiments, Figure 7 , 8 As shown, the above method also includes:

[0094] S310: When the extended-range vehicle enters the cooling mode, the third end of the second proportional three-way valve, the third end of the third proportional three-way valve, and the third end of the fourth proportional three-way valve are turned off, and the first end and the second end of the second proportional three-way valve, the first end and the second end of the third proportional three-way valve, and the first end and the second end of the fourth proportional three-way valve are controlled to be connected;

[0095] Specifically, the cooling mode of the EREV can be manually activated by the driver, or the EREV can be automatically activated after detecting that the external ambient temperature has risen to a set air-conditioning activation threshold (which may be 32 degrees Celsius).

[0096] S320: close the electronic expansion valve in the first EXV one-way valve assembly, and open the electronic expansion valve in the second EXV one-way valve assembly to prevent the condensate in the heat pump air conditioning circuit from flowing through the plate heat exchanger; start the compressor.

[0097] For example, Figure 7 As shown, after the cooling mode is started, the third end of the proportional three-way valve 2, the third end of the proportional three-way valve 3, and the third end of the proportional three-way valve 4 are first turned off, and the first end and the second end of the proportional three-way valve 2, the first end and the second end of the proportional three-way valve 3, and the first end and the second end of the proportional three-way valve 4 are controlled to be conductive. Then close EXV1, open EXV2, and finally start the compressor to prevent the condensing agent (which can be a hydrofluorocarbon HFCs substance) in the heat pump air conditioning circuit from flowing through the plate heat exchanger. Through such a thermal management system architecture design, the waste heat isolation of the range extender during cooling is achieved.

[0098] In some embodiments, Figure 8 , 9 As shown, the above method also includes:

[0099] S330: When the ambient temperature exceeds the set high temperature threshold, the range-extended vehicle has entered the cooling mode and the range extender is working, the second end of the first proportional three-way valve is turned off, and the second end and the third end of the first proportional three-way valve are controlled to be connected;

[0100] S340: Turn off the electronic water pump and PTC heater;

[0101] S350: Turn on the main water pump and increase the duty cycle of the radiator to dissipate the coolant in the range extender cooling circuit.

[0102] For example, Fig. 9 As shown, the high temperature threshold can be set to 38 degrees Celsius. When the external temperature of the EREV exceeds 38 degrees Celsius, it has entered the cooling mode and the range extender is working, the second end of the proportional three-way valve 1 is shut off, and the second end and the third end of the proportional three-way valve 1 are controlled to be connected; the electronic water pump and the PTC heater are turned off; the main water pump is turned on, and the duty cycle of the radiator is increased to dissipate the coolant in the cooling circuit of the range extender, while isolating the waste heat of the range extender, thereby improving the use experience of the EREV in hot summer environments.

[0103] For the specific limitations on the thermal management method for extended-range vehicles, please refer to the limitations on the thermal management system for extended-range vehicles mentioned above, which will not be repeated here.

[0104] According to a third aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which implements the steps of any one of the above-mentioned extended-range vehicle thermal management methods when the computer program is executed by a processor.

[0105] According to a fourth aspect, the present application provides a computer device, such as Fig.10As shown, it includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of any one of the above-mentioned extended-range vehicle thermal management methods are implemented.

[0106] According to a fifth aspect, the present application provides an EREV, comprising the above-mentioned thermal management system architecture, which implements the steps of any one of the above-mentioned extended-range vehicle thermal management methods during operation.

[0107] Among them, any reference to memory, storage, database or other media used in the embodiments provided in the present application may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. As an illustration and not limitation, RAM is available in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), synchronous link (Synchlink) DRAM (SLDRAM), memory bus (RamCUs), direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM).

[0108] The technical features of the above embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0109] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

[0110] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the statement "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

Claims

1. A thermal management system for an extended-range vehicle, characterized in that: The range-extended vehicle thermal management system includes a range-extender cooling circuit and a heat pump air-conditioning circuit connected via a plate heat exchanger; the heat pump air-conditioning circuit is used to provide cooling and / or heating functions for the passenger compartment and the power battery pack; The heat pump air conditioning circuit includes a gas-liquid separator, a compressor, an external condenser evaporator, a first electronic expansion valve check valve assembly, a second electronic expansion valve check valve assembly, a built-in condenser evaporator, and a power battery pack; The outlet of the gas-liquid separator is connected to the inlet of the compressor, and the outlet of the compressor is connected to the first end of the built-in condenser evaporator through the second proportional three-way valve and the third proportional three-way valve in sequence, and the outlet of the compressor is also connected to the first end of the external condenser evaporator through the second proportional three-way valve and the first three-way pipe in sequence; The second end of the external condenser evaporator is connected to the second end of the internal condenser evaporator through the first electronic expansion valve one-way valve assembly, the four-way pipe, the fourth proportional three-way valve, and the second electronic expansion valve one-way valve assembly in sequence; The first end and the second end of the plate heat exchanger are respectively connected to the fourth proportional three-way valve and the four-way pipe; The first end of the power battery pack is connected to the four-way pipe through an electronic expansion valve, and the second end is connected to the inlet of the gas-liquid separator through a third three-way pipe and a second three-way pipe in sequence; The second three-way pipe is also connected to the third proportional three-way valve, and the third three-way pipe is also connected to the first three-way pipe.

2. The extended-range vehicle thermal management system according to claim 1, characterized in that: The range extender cooling circuit includes an electronic water pump, a main water pump, a first proportional three-way valve, a radiator, a thermostat, a cylinder head water jacket and a cylinder body water jacket that are interconnected, a waste recirculation cooling device, and a plurality of expansion water tanks; The third end of the plate heat exchanger passes through the fourth three-way pipe connected to the water outlet of the electronic water pump, the third end of the first proportional three-way valve to the first end, and then is connected back to the fourth end of the plate heat exchanger; The fourth three-way pipe is connected to the first water inlet of the main water pump through the sixth three-way pipe, and the water outlet of the main water pump is connected to the water inlet of the cylinder water jacket and the water inlet of the waste recirculation cooling device through the fifth three-way pipe; The first water outlet of the cylinder head water jacket is connected to the second end of the first proportional three-way valve, the second water outlet is connected to the water inlet of the thermostat, and the third water outlet is connected to a type of upper water inlet of each expansion water tank; The first water outlet of the thermostat is connected to the radiator, the first water outlet of the radiator is connected to the second water inlet of the main water pump, the second water outlet of the thermostat is connected to the third water inlet of the main water pump, and the second water outlet of the radiator is connected to the second type of water inlet of each expansion water tank; The water outlet of the expansion water tank is connected to the sixth three-way pipe.

3. The extended-range vehicle thermal management system according to claim 2, characterized in that: The first electronic expansion valve check valve assembly and the second electronic expansion valve check valve assembly both include an electronic expansion valve and a check valve, and the pipeline where each electronic expansion valve is located is connected in parallel with the pipeline where the corresponding check valve is located.

4. The extended-range vehicle thermal management system according to claim 3, characterized in that: The range extender cooling circuit further includes a positive temperature coefficient (PTC) heater, which is installed between the first proportional three-way valve and the plate heat exchanger.

5. A thermal management method for an extended-range vehicle, characterized in that: The extended-range vehicle comprises the extended-range vehicle thermal management system according to claim 4, wherein the first end of the second proportional three-way valve is connected to the outlet of the compressor, the second end is connected to the first three-way pipe, and the third end is connected to the third end of the third proportional three-way valve; the first end of the third proportional three-way valve is connected to the inlet of the gas-liquid separator, and the second end is connected to the built-in condenser evaporator; the first end of the fourth proportional three-way valve is connected to the second electronic expansion valve one-way valve assembly, the second end is connected to the four-way pipe, and the third end is connected to the first end of the plate heat exchanger; the method further comprises: When the extended-range vehicle starts the heating mode, the second end of the second proportional three-way valve, the first end of the third proportional three-way valve and the second end of the fourth proportional three-way valve in the heat pump air-conditioning circuit are turned off, and the first end and the third end of the second proportional three-way valve, the second end and the third end of the third proportional three-way valve, and the first end and the third end of the fourth proportional three-way valve are controlled to be connected; closing the electronic expansion valve in the second electronic expansion valve check valve assembly, and opening the electronic expansion valve in the first electronic expansion valve check valve assembly; The compressor is started to allow the condensing agent in the heat pump air conditioning circuit to flow through the plate heat exchanger to absorb the waste heat of the coolant.

6. The method according to claim 5, characterized in that The method further comprises: When the range-extended vehicle has entered a heating mode and the range extender is working, the first end, the second end and the third end of the first proportional three-way valve are controlled to be connected to each other; The electronic water pump and the main water pump are started to allow the coolant flowing through the cylinder head water jacket and the cylinder body water jacket to flow through the plate heat exchanger to perform waste heat exchange.

7. The method according to claim 6, characterized in that The method further comprises: When the extended-range vehicle has entered the heating mode and the pure electric mode, the second end of the first proportional three-way valve is turned off, and the first end and the third end of the first proportional three-way valve are controlled to be connected; The electronic water pump is turned off to prevent the low-temperature coolant flowing through the cylinder head water jacket and the cylinder block water jacket from flowing through the plate heat exchanger.

8. The method according to claim 7, characterized in that The method further comprises: When the extended-range vehicle has entered the heating mode and the pure electric mode, and the ambient temperature drops to a set low temperature threshold, maintaining the second end of the first proportional three-way valve in an off state and the first end and the third end in a conducting state; The electronic water pump is restarted, and the duty cycle of the PTC heater is increased to increase the coolant temperature on the plate heat exchanger side.

9. The method according to claim 5, characterized in that The method further comprises: When the extended-range vehicle enters the cooling mode, the third end of the second proportional three-way valve, the third end of the third proportional three-way valve and the third end of the fourth proportional three-way valve are turned off, and the first end and the second end of the second proportional three-way valve, the first end and the second end of the third proportional three-way valve and the first end and the second end of the fourth proportional three-way valve are controlled to be connected; Closing the electronic expansion valve in the first electronic expansion valve check valve assembly and opening the electronic expansion valve in the second electronic expansion valve check valve assembly to prevent the condensate in the heat pump air conditioning circuit from flowing through the plate heat exchanger; The compressor is started.

10. The method according to claim 9, characterized in that The method further comprises: When the ambient temperature exceeds a set high temperature threshold, the range-extended vehicle has entered a cooling mode and the range extender is working, the second end of the first proportional three-way valve is turned off, and the second end and the third end of the first proportional three-way valve are controlled to be connected; Turn off the electronic water pump and the PTC heater; The main water pump is turned on and the duty cycle of the radiator is increased to dissipate heat from the coolant in the range extender cooling circuit.

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