A thermal management system and method for hybrid electric vehicles

Abstract

This application discloses a thermal management system and method for a hybrid electric vehicle. The thermal management system includes a first branch and a second branch. The first branch includes an electric main water pump and an engine water jacket connected to each other. Along the water flow direction of the engine water jacket, the inlet end is the first end of the first branch, and the outlet end is the second end of the first branch. The second branch includes a high-pressure electric heater for the battery circulation system coolant and a first electric water pump connected to each other. The second end of the first branch is connected to the first end of the second branch, and the first end of the first branch is connected to the second end of the second branch. This application forms a heating circuit between the high-pressure electric heater for the battery circulation system coolant and the engine water jacket, achieving engine water preheating and ensuring the engine is in a warm-up state before starting, significantly improving the emission pollution of hybrid vehicles.

Description

Technical Field

[0001] This application relates to the field of automotive technology, and more specifically, to a thermal management system and thermal management method for a hybrid electric vehicle. Background Technology

[0002] Hybrid electric vehicle technology is currently widely favored by major automakers. However, in order to improve the driving experience, hybrid electric vehicles use the engine to assist when the battery output power is insufficient. However, the emissions from the engine's cold start and warm-up process are generally quite severe.

[0003] On the other hand, for the sake of fuel economy, the engine will frequently start and stop, which also puts a lot of pressure on emissions. Summary of the Invention

[0004] This application provides a thermal management system and method for hybrid electric vehicles. By forming a heating circuit between the high-voltage electric heater of the battery circulation system coolant and the engine water jacket, the engine's water circuit is preheated, allowing the engine to reach a warm-up state before starting, which greatly improves the emission of pollutants from hybrid vehicles.

[0005] This application provides a thermal management system for a hybrid electric vehicle, including a first branch and a second branch;

[0006] The first branch includes an electric main water pump and an engine water jacket that are connected to each other. Along the water flow direction of the engine water jacket, the water inlet end is the first end of the first branch, and the water outlet end is the second end of the first branch.

[0007] The second branch includes an interconnected battery circulation system coolant high-pressure electric heater and a first electronic water pump;

[0008] The second end of the first branch is connected to the first end of the second branch, and the first end of the first branch is connected to the second end of the second branch.

[0009] Preferably, the second end of the first branch and the first end of the second branch are respectively connected to the first and second branches of the first three-way two-way solenoid valve, and a liquid-liquid heat exchanger and an air conditioning heater are provided between the third branch of the first three-way two-way solenoid valve and the second end of the second branch.

[0010] Preferably, it also includes a refrigeration circuit, which includes an engine condenser, an engine electric compressor, an air conditioning evaporator, and a battery cooler. The air conditioning evaporator and the battery cooler are connected in parallel, and an electric compressor and a condenser are connected in series between the two ends of the air conditioning evaporator.

[0011] Preferably, the system further includes a battery pack and a second electronic water pump. The first end of the battery pack is connected to the second electronic water pump, and the other end of the second electronic water pump is connected to the second path of a second three-way two-position solenoid valve. The third path and the first path of the second three-way two-position solenoid valve are respectively connected to a liquid-liquid heat exchanger and a battery cooler. The other ends of both the liquid-liquid heat exchanger and the battery cooler are connected to the second end of the battery pack.

[0012] This application also provides a thermal management method for a hybrid electric vehicle, including:

[0013] If the vehicle's power demand is less than the maximum output power that the pure electric system can provide, the ambient temperature is greater than the preset temperature, and the battery charge is less than the battery system's state of charge boundary between the charge holding phase and the charge consumption phase, and the engine coolant temperature is less than the critical warm-up temperature, then the electronic thermostat is kept closed, and the first and second channels of the first three-way two-way solenoid valve are connected while the third channel is closed. This controls the battery circulation system coolant high-pressure electric heater and the electric main water pump to work, so that the battery circulation system coolant high-pressure electric heater and the engine water jacket form a heating circuit until the engine coolant temperature is greater than or equal to the critical warm-up temperature.

[0014] Preferably, when the vehicle's required power is greater than the maximum output power that the pure electric system can provide, the engine is controlled to start, and if the engine coolant temperature is lower than the critical warm-up temperature, the engine is controlled to remain running.

[0015] Preferably, when the vehicle's required power is less than the maximum output power that the pure electric system can provide, and the battery charge is greater than the battery system's state of charge boundary between the charge holding phase and the charge consumption phase, if the battery's internal temperature is less than a preset temperature, the electronic thermostat is kept closed, the high-pressure electric heater of the battery circulation system coolant is activated, the second and third channels of the first three-way two-way solenoid valve are connected while the first channel is closed, the third and second channels of the second three-way two-way solenoid valve are connected while the first channel is closed, and the first and second electronic water pumps are activated until the battery's internal temperature is greater than or equal to the preset temperature.

[0016] Preferably, it further includes:

[0017] The engine coolant temperature was collected when the engine was cold and not started.

[0018] The electronic thermostat is kept closed, and the first and second channels of the first three-way two-way solenoid valve are connected while the third channel is closed. The battery circulation system coolant high-pressure electric heater and electric main water pump are operated.

[0019] After a preset time, calculate the change in engine coolant temperature;

[0020] Diagnostic methods for the high-voltage electric heater of the battery circulation system coolant are used to assess changes in engine water temperature.

[0021] Preferably, when the engine is running, if the engine coolant temperature is greater than or equal to the critical warm-up temperature, the electronic thermostat is kept closed, the first and third channels of the first three-way two-way solenoid valve are connected and the second channel is closed, the third and second channels of the second three-way two-way solenoid valve are connected and the first channel is closed, and the air conditioning heater, electric main water pump and second electronic water pump are operated.

[0022] Preferably, when the engine is running, if the engine coolant temperature is lower than the critical warm-up temperature, the electronic thermostat is kept closed, the first and second channels of the first three-way two-way solenoid valve are connected to the third channel, the third and second channels of the second three-way two-way solenoid valve are connected, and the first channel is closed, thereby controlling the operation of the air conditioning heater, the electric main water pump, the first electronic water pump, and the second electronic water pump.

[0023] Other features and advantages of this application will become clear from the following detailed description of exemplary embodiments with reference to the accompanying drawings. Attached Figure Description

[0024] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments of the present application and, together with their description, serve to explain the principles of the present application.

[0025] Figure 1 A schematic diagram of the thermal management system of the hybrid electric vehicle provided in this application;

[0026] Figure 2 A schematic diagram of the signal control for the thermal management system of the hybrid electric vehicle provided in this application;

[0027] Figure 3 A flowchart of the thermal management method for hybrid electric vehicles provided in this application. Detailed Implementation

[0028] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps set forth in these embodiments do not limit the scope of the present application.

[0029] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the scope of this application and its application or use.

[0030] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0031] In all the examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values.

[0032] This application provides a thermal management system and method for hybrid electric vehicles. By forming a heating circuit between the battery circulation system coolant high-pressure electric heater and the engine water jacket, the engine's water circuit is preheated, ensuring the engine is in a warm-up state before starting, significantly improving emissions from hybrid vehicles. Furthermore, this application prevents the engine from shutting down until the engine coolant temperature reaches a preset level, thereby reducing emissions. Simultaneously, this application allows for different heating circuits to be used for air conditioning heating and battery pack heating under different engine coolant temperatures. Additionally, this application utilizes the heating circuit formed between the battery circulation system coolant high-pressure electric heater and the engine water jacket to perform health checks on the battery circulation system coolant high-pressure electric heater, ensuring the normal operation of the thermal management system.

[0033] like Figure 1 As shown, the thermal management system of a hybrid electric vehicle includes an engine heating circuit, a battery pack circuit, and a cooling circuit.

[0034] The engine heating circuit includes a liquid-liquid heat exchanger, an air conditioning heater, a first branch, a second branch, and a heat dissipation branch.

[0035] The first branch includes an interconnected electric main water pump and an engine water jacket. Along the water flow direction of the engine water jacket (see arrow), the inlet end serves as the first end of the first branch. Figure 1 The middle part is the upper end), and the end from which the water flows out serves as the second end of the first branch. Figure 1 (The middle section is shown as the upper end). A first water temperature sensor is installed on the first branch. The second branch includes an interconnected battery circulation system coolant high-pressure electric heater (WPTC) and a first electric water pump. The second end of the first branch is connected to the first end of the second branch (…). Figure 1 The middle part (shown as the lower end) is connected, and the first end of the first branch is connected to the second end of the second branch (shown as the lower end). Figure 1 (The middle part is shown as the upper end) connection.

[0036] Specifically, such as Figure 1 As shown, the second end of the first branch and the first end of the second branch are respectively connected to the first channel 1 and the second channel 2 of the first three-way two-way solenoid valve. A liquid-liquid heat exchanger and an air conditioning heater are provided between the third channel 3 of the first three-way two-way solenoid valve and the second end of the second branch.

[0037] Therefore, the hot water in the engine water jacket and the water heated by the WPTC can be supplied to the air conditioning heater to meet the heating needs of the air conditioning system. The water can also pass through the heater and enter the liquid-liquid heat exchanger for heat exchange, generating hot water within the heat exchanger. Simultaneously, with the third channel (3) of the first three-way two-way solenoid valve closed, the water heated by the WPTC can also exchange heat with the water in the engine water jacket, heating the water in the engine water jacket and raising the engine's water temperature.

[0038] The cooling branch includes an electronic thermostat and an engine radiator located between the first and second ends of the first branch. The engine radiator is equipped with a fan. A second water temperature sensor is also installed on the cooling branch. Therefore, when the electronic thermostat is open, the engine radiator can cool the water in the engine's water jacket.

[0039] The refrigeration circuit includes an engine condenser, an engine electric compressor, an air conditioning evaporator, and a battery cooler (Chiller). The air conditioning evaporator and battery cooler are connected in parallel. A first expansion valve is installed on the branch containing the evaporator, and a second expansion valve is installed on the branch containing the Chiller. An electric compressor and a condenser are connected in series between the two ends of the air conditioning evaporator. When the first expansion valve is open, the chilled water in the condenser passes through the air conditioning evaporator to provide cool air to the cockpit, forming the air conditioning refrigeration circuit. When the second expansion valve is open, the chilled water in the condenser exchanges heat with the Chiller, cooling the water in the Chiller, forming the battery cooler cooling circuit.

[0040] The battery pack circuit includes the battery pack, the second electric water pump, and the aforementioned liquid-liquid heat exchanger and chiller. The first end of the battery pack ( Figure 1 The lower end (shown in the middle) is connected to the second electronic water pump, and the other end of the second electronic water pump ( Figure 1 The lower end (shown in the middle) is connected to the second channel 2 of the second and third-way two-way solenoid valve. The third channel 3 and the first channel 1 of the second and third-way two-way solenoid valve are connected to the liquid-liquid heat exchanger and the battery cooler, respectively. The other ends of the liquid-liquid heat exchanger and the battery cooler are both connected to the second end of the battery pack. Thus, heat exchange occurs between the liquid-liquid heat exchanger and the battery pack, heating the battery pack and forming a heating circuit. Heat exchange also occurs between the cooler and the battery pack, cooling the battery pack and forming a cooling circuit.

[0041] Hybrid vehicles are also equipped with ambient temperature sensors.

[0042] like Figure 2As shown, the first water temperature sensor, the second water temperature sensor, and the ambient temperature sensor are connected to the Electronic Control Unit (ECU) to provide temperature information to the ECU. The electronic thermostat and the electronic main water pump are also connected to the ECU and are turned on and off under the control of the ECU.

[0043] The ECU is connected to the Vehicle Control Unit (VCU) via a CAN bus. The electronic throttle pedal is connected to the VCU via a signal, providing throttle pedal information to the VCU. The first three-way two-way solenoid valve, the second three-way two-way solenoid valve, the WPTC, the second electronic water pump, the fan, and the first electronic water pump are all connected to the VCU via signals and are turned on and off under the control of the VCU.

[0044] Based on the above-described thermal management system, this application also provides a thermal management method for hybrid electric vehicles.

[0045] like Figure 3 As shown, when the high and low voltage systems are powered on and there are no system faults, and the vehicle is in the READY state, the vehicle is drivable and can be driven by inputting an accelerator pedal signal. Thermal management methods include:

[0046] S3010: Determine the driver's required power (P) 驾 Is it greater than the maximum output power (P) that a pure electric system can provide? BATMAX If yes, then execute S3020-S3050; otherwise, execute S3060.

[0047] S3020: If P 驾 >P BATMAX This indicates that the energy provided by the vehicle's pure electric system cannot meet the vehicle's driving needs. In order to meet the driver's driving needs, the VCU commands the ECU to immediately start the engine to participate in energy replenishment and continue to execute S3030.

[0048] S3030: Determine engine coolant temperature T A Is it greater than or equal to the critical warm-up water temperature T? 暖 (Generally 60℃). If so, execute S3040; otherwise, execute S3050.

[0049] S3040: If T A ≥T 暖 This indicates that the engine has completed warm-up and can charge the battery pack, at which point the ECU allows the engine to respond to the stop signal.

[0050] S3050: If T A <T 暖If the engine is still in the warm-up phase, then it is not yet fully warmed up. Each engine start generates significant pollutants, and frequent start-stop cycles during the warm-up process are detrimental to emissions control. Therefore, if T... A <T 暖 If the engine stops responding to the shutdown signal, the ECU will remain running and return to S3030. This strategy of preventing engine shutdown during warm-up when the engine starts immediately can reduce emissions during this phase.

[0051] S3060: If P 驾 ≤P BATMAX This indicates that the energy provided by the vehicle's pure electric system is sufficient to meet the vehicle's driving needs, and the vehicle operates in pure electric mode, temporarily without the need for engine intervention. At this point, it is determined whether the battery's State of Charge (SOC) is lower than the S0 point, the boundary between the battery's state of charge during the charge hold phase and the charge consumption phase. If yes, proceed to step S3070; otherwise, proceed to step S3080.

[0052] S3070: If SOC < S0, it indicates that the pure electric system's capacity is insufficient, and the engine will need to intervene after a certain period of time. At this point, the ambient temperature T should be determined. ENV Is it greater than or equal to the preset temperature T? L If yes, then execute S3090; otherwise, execute S3080.

[0053] S3080: If SOC ≥ S0, it indicates that the pure electric system has sufficient capacity and engine intervention is not required for the time being. Maintaining the battery's internal temperature is sufficient to sustain normal vehicle operation. The battery's internal temperature T is then determined. BAT Is it less than the preset temperature T? L If yes, then execute S3140; otherwise, end the process.

[0054] S3090: Determine engine coolant temperature T A Is it less than the critical warm-up water temperature T? 暖 If yes, then execute S3100-S3130; otherwise, end the process.

[0055] S3100: If T A <T 暖 In order to improve the cold engine emissions during cold start, it is necessary to increase the engine coolant temperature and preheat the engine. Therefore, the electronic thermostat is kept closed, and the first channel 1 and the second channel 2 of the first three-way two-way solenoid valve are connected, while the third channel 3 is closed.

[0056] S3110: Controls the electric main water pump to operate at the first speed n1, and the WPTC to heat at maximum power, so that the WPTC and the engine water jacket form an engine heating circuit. By controlling the WPTC to directly heat the engine water circuit at maximum power, the engine water temperature is increased.

[0057] S3120: Determine engine coolant temperature T A Is it greater than or equal to the critical warm-up water temperature T? 暖 If yes, then execute S3130; otherwise, return to S3110.

[0058] S3130: If T A ≥T 暖 If the engine warm-up is successful, WPTC heating is stopped, the VCU commands the engine to start to charge the battery pack, and the process ends.

[0059] S3140: If T BAT <T L This indicates that the internal temperature of the battery is insufficient and the battery pack needs to be heated. The electronic thermostat is kept closed, and the second channel 2 and the third channel 3 of the first three-way two-way solenoid valve are connected, while the first channel 1 is closed. The third channel 3 of the second three-way two-way solenoid valve is connected to the second channel 2, while the first channel 1 is closed.

[0060] S3150: Controls the first and second electronic water pumps to operate at the second speed n2 and the third speed n3 respectively, controls the WPTC to operate at maximum power, so that the hot water in the WPTC exchanges heat with the liquid-liquid heat exchanger, increases the water temperature in the liquid-liquid heat exchanger, and then uses the liquid-liquid heat exchanger to heat the battery system, so that the battery pack can quickly enter the optimal operating temperature range.

[0061] S3160: Determine the internal temperature T of the battery BAT Is it greater than or equal to the preset temperature T? L If yes, then execute S3170; otherwise, return to S3150.

[0062] S3170: Stop WPTC heating and end the process.

[0063] The thermal management method of this application also includes air conditioning heating and battery pack heating functions.

[0064] Specifically, when the engine is running, if T A ≥T 暖 The system controls the electronic thermostat to remain closed, connects the first channel 1 and the third channel 3 of the first three-way two-way solenoid valve, and closes the second channel 2. It also controls the third channel 3 of the second three-way two-way solenoid valve to connect the second channel 2, and closes the first channel 1. This controls the operation of the air conditioning heater, the electric main water pump, and the second electronic water pump. The engine provides both air conditioning heating and battery pack heating.

[0065] If T is in the engine starting state A <T 暖Then, the electronic thermostat is kept closed, and the first two channels (1 and 2) of the first three-way two-way solenoid valve are connected to the third channel (3). The third channel (3) of the second three-way two-way solenoid valve is connected to the second channel (2), and the first channel (1) is closed. This controls the operation of the air conditioning heater, electric main water pump, first electronic water pump, and second electronic water pump. By simultaneously operating the engine and WPTC, air conditioning heating and battery pack heating are quickly achieved until T... A ≥T 暖 .

[0066] When the engine is running, if the engine coolant temperature T A If the temperature exceeds the first threshold T0, the electronic thermostat will activate and the engine radiator will start, using the fan to cool the engine until the engine coolant temperature reaches T. A It is below the first threshold T0.

[0067] The thermal management method of this application also includes air conditioning cooling and battery pack cooling functions. At this time, the first channel 1, the second channel 2 and the third channel 3 of the first three-way two-way solenoid valve are closed at the same time, the first channel 1 and the second channel 2 of the second three-way two-way solenoid valve are connected and the third channel 3 is closed, the first electronic water pump is closed, the second electronic water pump is working, and the electric compressor and condenser are controlled to provide cooling for the air conditioner and the chiller.

[0068] Because the thermal management system plays a crucial role, it requires regular diagnostic monitoring. The thermal management method described in this application also includes diagnostics of the WPTC.

[0069] Specifically, the WPTC diagnostic process is initiated when the engine is cold and not started, and the engine coolant temperature is recorded as T by collecting the temperature signal from the first coolant temperature sensor. A1 The ECU controls the electronic thermostat to close, the electric main water pump operates at the first speed n1, the VCU controls the first three-way two-port solenoid valve to connect the first channel 1 and the second channel 2, and close the third channel 3, and controls the WPTC to heat at maximum power, thereby raising the engine coolant temperature through the WPTC. After time t0, if the engine coolant temperature change ΔT is greater than the second threshold ΔT... α If the engine coolant temperature change ΔT is less than the second threshold ΔT, then the WPTC function is considered normal; α And greater than the third threshold ΔT β If the engine coolant temperature change ΔT is less than the third threshold ΔT, the diagnosis is WPTC malfunction and heating power is limited. β If so, the diagnosis is that the WPTC is not working or is completely damaged.

[0070] This application can effectively improve the emissions of hybrid vehicles (especially plug-in hybrid electric vehicles) during cold start and warm-up, while also heating the battery pack so that it can operate within a more reasonable temperature range, thereby improving power output and battery pack life.

[0071] While specific embodiments of this application have been described in detail by way of examples, those skilled in the art should understand that the above examples are for illustrative purposes only and are not intended to limit the scope of this application. Those skilled in the art should understand that modifications can be made to the above embodiments without departing from the scope and spirit of this application. The scope of this application is defined by the appended claims.

Claims

1. A thermal management method for a hybrid vehicle based on a thermal management system, characterized by, Comprise: S3010: Determine the driver's power demand P 驾 Is it greater than the maximum output power P that a pure electric system can provide? BATMAX If yes, then execute S3020-S3050; otherwise, execute S3060. S3020: If P 驾 > P BATMAX , it indicates that the energy provided by the pure electric system of the vehicle cannot meet the driving demand of the vehicle, at this time the VCU commands the ECU to start the engine immediately to participate in energy supply, and continues to execute S3030; S3030: Determine whether the engine water temperature T A is greater than or equal to the warm-up critical water temperature T 暖 ; if so, perform S3040; otherwise, perform S3050; S3040: If T A ≥ T 暖 , it indicates that the engine has completed the warm-up, and the battery pack can be charged, at this time the ECU allows the engine to respond to the stop signal; S3050: if T A <T 暖 indicates that the engine is still in the warm-up stage, at which the ECU prohibits the engine from responding to the stop signal, and maintains the starting state, and returns to S3030, which is used to reduce emissions in the warm-up stage. S3060: if P 驾 ≤ P BATMAX , it indicates that the energy provided by the pure electric system of the vehicle meets the driving demand of the vehicle, the vehicle works in the pure electric mode, and the engine does not need to intervene temporarily; at this time, it is judged whether the battery SOC is less than the battery system state-of-charge dividing point S0 of the battery power maintaining stage and the battery power consumption stage; if yes, S3070 is executed; otherwise, S3080 is executed. S3070: If SOC < S0, it indicates that the pure electric system is insufficient, and the engine needs to be involved after a certain time; at this time, the ambient temperature T is judged ENV whether it is greater than or equal to the preset temperature T L ; if yes, S3090 is executed; otherwise, S3080 is executed; S3080: If SOC≥S0, it indicates that the pure electric system capacity is relatively abundant, and the engine intervention is temporarily not needed at this time. At this time, the battery internal temperature is maintained to maintain the normal operation of the vehicle, and at this time, it is judged whether the battery internal temperature T BAT is less than the preset temperature T L ; if yes, S3140 is executed; otherwise, the flow is ended. S3090: Determine whether the engine water temperature T A is less than the warm-up critical water temperature T 暖 ; if so, execute S3100-S3130; otherwise, end the flow; S3100: If T A <T 暖 Then, the electronic thermostat is controlled to keep the closed state, and the first and second paths of the first three-path two-way electromagnetic valve are controlled to be communicated, and the third path is closed. S3110: control the electric main water pump to work at the first rotating speed n1, control the WPTC to heat at the maximum power, make the WPTC and the engine water jacket form the engine heating loop, and heat the engine water loop directly by controlling the WPTC at the maximum power; S3120: judge whether the engine water temperature T A is greater than or equal to the warm-up critical water temperature T 暖 ; if yes, execute S3130; otherwise, return to S3110; S3130: If T A ≥ T 暖 , it indicates that the engine warm-up is successful, at this time the WPTC heating is stopped, the VCU commands the engine to start to charge the battery pack, and the flow ends. S3140: If T BAT <T L indicates that the internal temperature of the battery is insufficient, the battery pack needs to be heated, the electronic thermostat is controlled to remain closed, the second and third paths of the first three-way two-way electromagnetic valve are controlled to be communicated, and the first path is closed, the third and second paths of the second three-way two-way electromagnetic valve are controlled to be communicated, and the first path is closed. S3150: control the first electronic water pump and the second electronic water pump to work at the second rotating speed n2 and the third rotating speed n3 respectively, control the WPTC to work at the maximum power, so that the hot water in the WPTC exchanges heat with the liquid-liquid heat exchanger; use the liquid-liquid heat exchanger to heat the battery system, so that the battery pack quickly enters the preset optimal working temperature interval; S3160: Determine whether the battery internal temperature T BAT is greater than or equal to a preset temperature T L ; if yes, execute S3170; otherwise, return to S3150; S3170: stop the WPTC heating, and end the process; Wherein, the thermal management system at least includes a first branch and a second branch; The first branch includes an electric main water pump and an engine water jacket connected with each other, along the water flow direction of the engine water jacket, the water inlet end is the first end of the first branch, and the water outlet end is the second end of the first branch; The second branch includes a battery circulation system cooling liquid high-voltage electric heater and a first electronic water pump connected with each other; The second end of the first branch is connected with the first end of the second branch, and the first end of the first branch is connected with the second end of the second branch; Wherein, the second end of the first branch and the first end of the second branch are connected with the first road and the second road of the first three-way two-way electromagnetic valve respectively, the third road of the first three-way two-way electromagnetic valve and the second end of the second branch are provided with a liquid-liquid heat exchanger and an air conditioner heater; and, Further comprising a refrigeration circuit, the refrigeration circuit includes an engine condenser, an engine electric compressor, an air conditioner evaporator and a battery cooler, the air conditioner evaporator and the battery cooler are connected with each other in parallel, the electric compressor and the condenser are connected with each other in series between the two ends of the air conditioner evaporator; Further comprising a battery pack and a second electronic water pump, the first end of the battery pack is connected with the second electronic water pump, the other end of the second electronic water pump is connected with the second road of the second three-way two-way electromagnetic valve, the third road and the first road of the second three-way two-way electromagnetic valve are connected with the liquid-liquid heat exchanger and the battery cooler respectively, the other end of the liquid-liquid heat exchanger and the battery cooler is connected with the second end of the battery pack.

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