Vehicle thermal management system

Abstract

According to the vehicle thermal management system provided by the invention, the engine thermal management system, the motor thermal management system and the battery cabin thermal management system are communicated through the seven-way valve, so that rapid transfer and sharing of heat of the engine thermal management system, the motor thermal management system and the battery cabin thermal management system can be realized; the heat of the engine heat management system, the motor heat management system and the battery cabin heat management system can be efficiently managed.

Description

Technical Field

[0001] The present application relates to the technical field of automobile thermal management, and in particular to a vehicle thermal management system. Background Art

[0002] Driven by the goal of "carbon peak and carbon neutrality", new energy vehicles are developing rapidly. Among them, extended-range electric vehicles have gradually become a popular choice for consumers due to their low investment cost, outstanding fuel economy, low emission levels and driving range comparable to traditional fuel vehicles, showing good development prospects. Despite this, there are still many problems with the thermal management system of current extended-range electric vehicles. Among them, the high complexity of the system makes control and maintenance more difficult; the integration of waste heat utilization is low, and each system usually performs thermal management independently, so that the overall energy efficiency of the system cannot be fully utilized. Therefore, it is very necessary to develop a more efficient and more integrated thermal management system. Summary of the invention

[0003] The purpose of the embodiments of the present application is to provide a vehicle thermal management system to solve the above-mentioned technical problems.

[0004] In one aspect, a vehicle thermal management system is provided, comprising: a seven-way valve, an engine thermal management system, a motor thermal management system, a battery cabin thermal management system, and a controller;

[0005] Wherein, the engine thermal management system comprises a first coolant transmission pipeline, the output end of the first coolant transmission pipeline is connected to the first connection end of the seven-way valve, and the input end of the first coolant transmission pipeline is connected to the second connection end of the seven-way valve;

[0006] The motor thermal management system includes a second coolant transmission pipeline connected to the third connection end of the seven-way valve, a third coolant transmission pipeline and a fourth coolant transmission pipeline connected to the output end of the second coolant transmission pipeline; the second coolant transmission pipeline is used to cool the target motor device and the oil cooler; an intercooler is provided on the third coolant transmission pipeline, and the output end of the third coolant transmission pipeline is connected to the fourth connection end of the seven-way valve; a radiator is provided on the fourth coolant transmission pipeline, and the output end of the fourth coolant transmission pipeline is connected to the fifth connection end of the seven-way valve;

[0007] The battery cabin thermal management system includes a heat exchanger, a first refrigerant transmission pipeline and a second refrigerant transmission pipeline connected between two refrigerant transmission ports of the heat exchanger, the two coolant transmission ports of the heat exchanger are respectively connected to the sixth connection end and the seventh connection end of the seven-way valve, the first refrigerant transmission pipeline is used to exchange heat with the battery of the vehicle, and the second refrigerant transmission pipeline is used to exchange heat with the cabin of the vehicle;

[0008] The controller is used to control the communication mode of the seven-way valve according to the current driving condition of the vehicle.

[0009] In one embodiment, the vehicle thermal management system further includes an oil cooler control valve, and the oil cooler control valve is used to control the amount of motor gear oil entering the oil cooler for heat exchange.

[0010] In one of the embodiments, the controller is used to control the connectivity of the seven-way valve according to the current operating mode and temperature information of the vehicle; the temperature information includes at least one of the ambient temperature of the vehicle's current environment and the component temperature of the target component of the vehicle.

[0011] In one of the embodiments, a battery direct cooling and heating plate is provided on the first refrigerant transmission pipeline, and the second refrigerant transmission pipeline includes a first pipeline branch provided with an air-conditioning evaporator, a second pipeline branch provided with a built-in condenser, and a third pipeline branch provided with an external condenser in parallel; an air-conditioning heater core is provided between the output end of the first coolant transmission pipeline and the first connection end; the vehicle thermal management system also includes a heater for heating the air-conditioning heater core.

[0012] In one embodiment, the controller is used to control the first connection terminal and the second connection terminal to be disconnected when it is determined that the vehicle is in a pure electric operating mode, and to control the connection mode between the third connection terminal, the fourth connection terminal, the fifth connection terminal, the sixth connection terminal and the seventh connection terminal according to the temperature information.

[0013] In one embodiment, the controller is used to control the fifth connection end to be disconnected, control the third connection end to be connected to the seventh connection end, and control the fourth connection end to be connected to the sixth connection end when it is determined that the vehicle is in a pure electric working mode and the vehicle meets a first low temperature working condition according to the temperature information;

[0014] and / or,

[0015] The controller is used to control the sixth connection terminal and the seventh connection terminal to be disconnected, and control the third connection terminal to be connected to the fourth connection terminal, and control the third connection terminal to be connected to the fifth connection terminal, when it is determined that the vehicle is in a pure electric working mode and the vehicle meets a first normal temperature working condition according to the temperature information;

[0016] and / or,

[0017] The controller is used to control the fourth connection terminal, the sixth connection terminal and the seventh connection terminal to be disconnected, and control the third connection terminal to be connected to the fifth connection terminal when it is determined that the vehicle is in a pure electric operating mode and when it is determined based on the temperature information that the vehicle meets a first high-temperature operating condition.

[0018] In one embodiment, the controller is used to control the first refrigerant transmission pipeline to be connected to the heat exchanger, and control the opening of the oil cooler control valve when it is determined that the vehicle is in a pure electric working mode, and when it is determined that the vehicle meets a first low-temperature working condition according to the temperature information, and when it is determined that the vehicle meets a battery heating condition;

[0019] and / or,

[0020] The controller is used for controlling the first pipeline branch and the second pipeline branch to be connected to the heat exchanger respectively, and controlling the oil cooler control valve to be opened when it is determined that the vehicle is in a pure electric working mode, and when it is determined that the vehicle meets a first low-temperature working condition according to the temperature information, and when it is determined that the vehicle meets a cabin heating condition;

[0021] and / or,

[0022] The controller is used to control the external condenser to absorb ambient heat, control the third pipeline branch to be connected to the first refrigerant transmission pipeline, and control the oil cooler control valve to be fully closed when it is determined that the vehicle is in a pure electric operating mode, and determines based on the temperature information that the vehicle meets the first low-temperature operating condition, and determines that the vehicle meets the motor insulation condition.

[0023] In one embodiment, the battery heating condition includes: the temperature of the battery of the vehicle is less than a first preset temperature threshold, and the difference between the temperature of the coolant in the motor thermal management system and the temperature of the battery is greater than a second preset temperature threshold.

[0024] In one embodiment, the controller is also used to, when it is determined that the vehicle is in a pure electric operating mode and, based on the temperature information, determines that the vehicle meets a first low-temperature operating condition, if it is determined that the operating condition of the motor of the vehicle meets a preset condition, control turning off the heating function of the heater; if it is determined that the operating condition of the motor does not meet the preset condition, control turning on the heating function of the heater; the preset conditions include the operating time of the motor reaching a preset time and / or the motor being in a high-load working state.

[0025] In one embodiment, the controller is further used to control the first connection end to be connected to the second connection end, control the third connection end to be connected to the seventh connection end, control the fourth connection end to be connected to the sixth connection end, control the disconnection of the fifth connection end, control the first refrigerant transmission pipeline, the first pipeline branch and the second pipeline branch to be connected to the heat exchanger respectively, and control the opening of the heater and the oil cooler control valve when it is determined that the vehicle is in a hybrid working mode and the vehicle meets a second low-temperature working condition according to the temperature information;

[0026] and / or,

[0027] The controller is used for, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a third low-temperature working condition, controlling the first connection end to be connected to the third connection end, controlling the second connection end to be connected to the fourth connection end, controlling the fifth connection end, the sixth connection end and the seventh connection end to be disconnected, controlling the external condenser to absorb ambient heat, controlling the second pipeline branch and the third pipeline branch to be connected to the first refrigerant transmission pipeline respectively, controlling the first refrigerant transmission pipeline to be disconnected from the heat exchanger, controlling the heater to be turned on, and controlling the oil cooler control valve to be fully closed;

[0028] and / or,

[0029] The controller is used for, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a fourth low-temperature working condition, controlling the first connection end to be connected to the seventh connection end, controlling the second connection end to be connected to the fourth connection end, controlling the third connection end to be connected to the sixth connection end, controlling the fifth connection end to be disconnected, controlling the first refrigerant transmission pipeline and the second pipeline branch to be connected to the heat exchanger respectively, controlling the heater to be turned off, and controlling the oil cooler control valve to be opened;

[0030] and / or,

[0031] The controller is used for, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a fifth low-temperature working condition, controlling the first connection end to be connected to the seventh connection end, controlling the second connection end to be connected to the fourth connection end, controlling the third connection end to be connected to the sixth connection end, and controlling the fifth connection end to be disconnected, controlling the first refrigerant transmission pipeline to be connected to the heat exchanger, controlling the air conditioning heater core to heat the cabin of the vehicle and / or the battery, controlling to turn off the heater, and controlling to open the oil cooler control valve;

[0032] and / or

[0033] The controller is used for, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a sixth low-temperature working condition, controlling the first connection end to be connected to the seventh connection end, controlling the second connection end to be connected to the sixth connection end, controlling the third connection end to be connected to the fourth connection end and the fifth connection end respectively, controlling the first refrigerant transmission pipeline to be connected to the heat exchanger, controlling the air conditioning heater core to heat the cabin of the vehicle and / or the battery, controlling to turn off the heater, and controlling to open the oil cooler control valve;

[0034] and / or,

[0035] The controller is used for controlling the fourth connection end to be connected with the sixth connection end, controlling the third connection end to be connected with the seventh connection end, controlling the first connection end, the second connection end and the fifth connection end to be disconnected, controlling the first refrigerant transmission pipeline and the second pipeline branch to be connected with the heat exchanger respectively, and controlling the oil cooler control valve to be opened when it is determined that the vehicle is in a hybrid working mode and the vehicle meets a seventh low-temperature working condition according to the temperature information;

[0036] and / or,

[0037] The controller is used to control the first connection end to be connected with the second connection end, control the third connection end to be connected with the fourth connection end and the fifth connection end respectively, and control the sixth connection end to be disconnected from the seventh connection end when it is determined that the vehicle is in a hybrid working mode and the vehicle meets a second normal temperature working condition according to the temperature information;

[0038] and / or,

[0039] The controller is used to control the third connection end and the fifth connection end to be connected, and control the first connection end, the second connection end, the fourth connection end, the sixth connection end and the seventh connection end to be disconnected when it is determined that the vehicle is in a hybrid operating mode and that the vehicle meets a second high-temperature operating condition based on the temperature information.

[0040] The vehicle thermal management system provided in the present application connects the engine thermal management system, the motor thermal management system and the battery cabin thermal management system through a seven-way valve, thereby realizing rapid transfer and sharing of heat among the engine thermal management system, the motor thermal management system and the battery cabin thermal management system, and efficiently managing the heat among the engine thermal management system, the motor thermal management system and the battery cabin thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 A schematic diagram of a partial structure of a vehicle thermal management system provided in an embodiment of the present application;

[0042] Figure 2 A partial structural diagram of another vehicle thermal management system provided in an embodiment of the present application;

[0043] Figure 3 A schematic diagram of a vehicle thermal management system provided by an embodiment of the present application in a first working state;

[0044] Figure 4 A schematic diagram of a vehicle thermal management system provided by an embodiment of the present application in a second working state;

[0045] Figure 5 A schematic diagram of a vehicle thermal management system provided by an embodiment of the present application in a third working state;

[0046] Figure 6 A schematic diagram of a vehicle thermal management system provided by an embodiment of the present application in a fourth working state;

[0047] Figure 7 A schematic diagram of a vehicle thermal management system provided in an embodiment of the present application in a fifth working state;

[0048] Figure 8 A schematic diagram of a vehicle thermal management system provided in an embodiment of the present application in a sixth working state;

[0049] Fig. 9 A schematic diagram of a vehicle thermal management system provided in an embodiment of the present application in a seventh working state;

[0050] Fig.10 A schematic diagram of a vehicle thermal management system provided in an embodiment of the present application in an eighth working state;

[0051] Fig.11 A schematic diagram of a vehicle thermal management system provided in an embodiment of the present application in a ninth working state;

[0052] Fig.12 A schematic diagram of a vehicle thermal management system provided in an embodiment of the present application in a tenth working state;

[0053] Fig.13 A schematic diagram of a vehicle thermal management system provided in an embodiment of the present application in an eleventh working state;

[0054] Fig.14 A schematic diagram of a vehicle thermal management system provided by an embodiment of the present application in a twelfth working state;

[0055] Fig.15 A schematic diagram of a vehicle thermal management system provided in an embodiment of the present application in a thirteenth working state;

[0056] Reference numerals:

[0057] 11: seven-way valve; 1: the first connection end of the seven-way valve; 2: the second connection end of the seven-way valve; 3: the third connection end of the seven-way valve; 4: the fourth connection end of the seven-way valve; 5: the fifth connection end of the seven-way valve; 6: the sixth connection end of the seven-way valve; 7: the seventh connection end of the seven-way valve; 12: engine thermal management system; 13: the second cooling transmission pipeline; 14: intercooler; 15: radiator; 16: heat exchanger; 17: the first refrigerant transmission pipeline; 18: the second refrigerant transmission pipeline; 19: battery direct cooling and direct heating plate; 20: air conditioning evaporator; 21: built-in condenser; 22: external condenser; 23: air conditioning heater core: 24: heater; 25: drying bottle; 26: electronic compressor engine; 27: first water pump; 28: target motor device; 29: oil cooler; 121: high temperature radiator; 122: second water pump; 123: engine block; 124: engine cylinder head; 125: electronic thermostat; 126: EGR cooler; 127: supercharger; 128: oil cooler; 129: third water pump; SOV1: first solenoid valve; SOV2: second solenoid valve; SOV3: third solenoid valve; SOV4: fourth solenoid valve; SOV5: fifth solenoid valve; SOV6: sixth solenoid valve; EXV1: first electronic expansion valve; EXV2: second electronic expansion valve; EXV3: third electronic expansion valve; EXV4: fourth electronic expansion valve. DETAILED DESCRIPTION

[0058] 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.

[0059] The present application provides a vehicle thermal management system. Figure 1 As shown, it includes a seven-way valve 11, an engine thermal management system 12, a motor thermal management system, a battery cabin thermal management system and a controller.

[0060] The engine thermal management system 12 includes a first coolant transmission pipeline, the output end of the first coolant transmission pipeline is connected to the first connection end of the seven-way valve 11, and the input end of the first coolant transmission pipeline is connected to the second connection end of the seven-way valve 11. The coolant in the first coolant transmission pipeline absorbs the heat generated by the engine, thereby realizing thermal management of the engine system.

[0061] The motor thermal management system includes a second coolant transmission pipeline 13 connected to the third connection end of the seven-way valve, and a third coolant transmission pipeline and a fourth coolant transmission pipeline connected to the output end of the second coolant transmission pipeline; the second coolant transmission pipeline is used to cool the target motor components and the oil cooler; an intercooler 14 is provided on the third coolant transmission pipeline, and the output end of the third coolant transmission pipeline is connected to the fourth connection end of the seven-way valve 11; a radiator 15 is provided on the fourth coolant transmission pipeline, and the output end of the fourth coolant transmission pipeline is connected to the fifth connection end of the seven-way valve 11.

[0062] In the embodiment of the present application, the second coolant transmission pipeline 13, the third coolant transmission pipeline and the fourth coolant transmission pipeline all transmit coolant, through which heat can be exchanged with the motor system, thereby achieving thermal management of the motor system.

[0063] It should be noted that the target motor device refers to the device in the motor control system, including but not limited to at least one of the OBC+DC / DC two-in-one module, the front motor controller and the rear motor controller. Thermal management of the entire motor system can be achieved by performing thermal management on the target motor device.

[0064] When the vehicle is in pure electric working mode, the intercooler does not work, and the third coolant transmission pipeline is only used to transmit coolant. When the vehicle is in hybrid working mode, the intercooler is started. The intercooler not only transmits coolant, but also can reduce the high-temperature air temperature after air turbocharging to reduce the heat load of the engine. That is, the third coolant transmission pipeline at this time is not only used to transmit coolant, but also can exchange heat with the intercooler.

[0065] The battery cabin thermal management system includes a heat exchanger 16, a first refrigerant transmission pipeline 17 and a second refrigerant transmission pipeline 18 connected between two refrigerant transmission ports of the heat exchanger 16, the two coolant transmission ports of the heat exchanger 16 are respectively connected to the sixth connection end and the seventh connection end of the seven-way valve 11, the first refrigerant transmission pipeline 17 is used for heat exchange with the battery of the vehicle, and the second refrigerant transmission pipeline 18 is used for heat exchange with the cabin of the vehicle.

[0066] In the embodiment of the present application, the first refrigerant transmission pipeline 17 and the first refrigerant transmission pipeline 18 transmit refrigerant, and the refrigerant absorbs or releases heat to achieve thermal management of the battery and the cabin.

[0067] When the heat exchange function of the heat exchanger 16 is turned on, the heat exchanger 16 can exchange heat between the coolant transmitted between the two coolant transmission ports and the refrigerant transmitted between the two refrigerant transmission ports.

[0068] The controller in the embodiment of the present application is used to control the connection mode of the seven-way valve 11 according to the current driving condition of the vehicle. Specifically, the seven-way valve 11 can be used to control the engine thermal management system 12 to be connected with the motor thermal management system according to the driving condition, so as to realize the mutual use of heat between the engine thermal management system 12 and the motor thermal management system, the seven-way valve 11 can be used to control the motor thermal management system to be connected with the battery cabin thermal management system according to the driving condition, so as to realize the mutual use of heat between the motor thermal management system and the battery cabin thermal management system, and the seven-way valve 11 can be used to control the engine thermal management system 12 to be connected with the battery cabin thermal management system according to the driving condition, so as to realize the mutual use of heat between the engine thermal management system 12 and the battery cabin thermal management system.

[0069] In the embodiment of the present application, the current driving condition of the vehicle includes but is not limited to the current working mode and / or temperature information of the vehicle. The working mode is a pure electric working mode or a hybrid working mode, and the temperature information includes at least one of the ambient temperature of the vehicle's current environment and the component temperature of the target component of the vehicle, and the target component includes but is not limited to at least one of a motor, a battery, a battery cell, and an engine.

[0070] See also Figure 2As shown, the first refrigerant transmission pipeline 17 is provided with a battery direct cooling and direct heating plate 19, through which the battery direct cooling and direct heating plate 19 can cool or heat the battery. The second refrigerant transmission pipeline 18 includes a first pipeline branch provided with an air conditioning evaporator 20, a second pipeline branch provided with a built-in condenser 21, and a third pipeline branch provided with an external condenser 22 in parallel; an air conditioning heater core 23 is provided between the output end of the first coolant transmission pipeline and the first connection end; the vehicle thermal management system also includes a heater 24 for heating the air conditioning heater core 23. The controller in the embodiment of the present application can control the connection or disconnection of the pipelines between the air conditioning evaporator 20, the built-in condenser 21, the external condenser 22 and the heat exchanger 16.

[0071] Based on the structure of the thermal management system above, the control strategy of the controller is introduced below.

[0072] When the vehicle is in the pure electric working mode, the engine system does not participate in the work, so the controller in the embodiment of the present application is used to control the first connection end and the second connection end to be disconnected when it is determined that the vehicle is in the pure electric working mode, and control the connection mode between the third connection end, the fourth connection end, the fifth connection end, the sixth connection end and the seventh connection end according to the temperature information. At the same time, the controller can also control the heat exchanger 16 to be turned on or off, control the heater to be turned on or off, control the opening and closing of the oil cooler control valve, and when the oil cooler control valve is opened, it can also control the opening degree of the oil cooler control valve, thereby controlling the amount of motor gear oil flowing into the oil cooler.

[0073] Specifically, the control strategy of the controller in the embodiment of the present application includes but is not limited to at least one of the following strategies:

[0074] Strategy 1:

[0075] When the controller determines that the vehicle is in a pure electric operating mode and determines that the vehicle meets the first low-temperature operating condition based on the temperature information, the controller controls the fifth connection terminal to be disconnected, controls the third connection terminal to be connected to the seventh connection terminal, and controls the fourth connection terminal to be connected to the sixth connection terminal.

[0076] The first low-temperature working condition in the embodiment of the present application can be flexibly set by the developer, for example, it can be set to the ambient temperature of the vehicle's environment being lower than a preset first ambient temperature threshold. This first ambient temperature threshold can also be flexibly set by the developer, for example, to 0°C.

[0077] On the basis of the above strategy one, when the controller determines that the vehicle is in the pure electric working mode and determines that the vehicle meets the first low-temperature working condition based on the temperature information, if it is determined that the vehicle also meets the battery heating condition, the controller controls the first refrigerant transmission pipeline 17 and the heat exchanger 16 to be connected, and controls the oil cooler control valve to open, and turns on the heat exchange function of the heat exchanger 16. At this time, through the heat exchanger 16, the heat of the coolant in the second coolant transmission pipeline 13 and the third coolant transmission pipeline can be transferred to the first refrigerant transmission pipeline 17, thereby realizing battery heating and realizing the function of utilizing the surplus of the motor thermal management system to heat the battery.

[0078] The battery heating conditions can be flexibly set by the developer. It is understandable that only when there is a certain temperature difference between the coolant in the motor thermal management system and the battery can the heat of the coolant in the motor thermal management system be effectively used to heat the battery. Therefore, in an optional implementation, the battery heating conditions can be set as follows:

[0079] The temperature of the battery of the vehicle is less than a first preset temperature threshold, and the difference between the temperature of the coolant in the motor thermal management system and the temperature of the battery is greater than a second preset temperature threshold. The values ​​of the first preset temperature threshold and the second preset temperature threshold here can be flexibly set by the developer. For example, the first preset temperature threshold can be set to 10°C, and the second preset temperature threshold can be set to 5°C. The difference between the temperature of the coolant in the motor thermal management system and the temperature of the battery in the embodiment of the present application can be the difference between the temperature of the coolant in the second coolant transmission pipeline 13 and the temperature of the battery pack cell.

[0080] Similarly, based on the above strategy one, when the controller determines that the vehicle is in the pure electric working mode and determines that the vehicle meets the first low-temperature working condition based on the temperature information, if it is determined that the vehicle also meets the cabin heating condition, the first pipeline branch and the second pipeline branch are controlled to be connected to the heat exchanger 16 respectively, and the oil cooler control valve is controlled to open. At this time, the heat of the coolant in the second coolant transmission pipeline 13 and the third coolant transmission pipeline can be transferred to the first pipeline branch and the second pipeline branch through the heat exchanger 16, thereby realizing cabin heating and realizing the function of utilizing the surplus of the motor thermal management system to heat the cabin.

[0081] Similarly, on the basis of the above strategy one, when the controller determines that the vehicle is in the pure electric working mode and determines that the vehicle meets the first low-temperature working condition based on the temperature information, if it is determined that the vehicle also meets the motor insulation condition, the controller controls the external condenser to absorb ambient heat, controls the third pipeline branch to be connected to the first refrigerant transmission pipeline 17, and controls the oil cooler control valve to be fully closed, that is, the motor gear oil will not pass through the oil cooler, so the coolant in the second coolant transmission pipeline 13 will not exchange heat with the motor gear oil, thereby quickly increasing the oil temperature in the motor system, and the heat generated by the motor system is retained inside the motor system. The efficiency of the transmission box is improved by quickly increasing the oil temperature of the transmission box, avoiding the problem of excessive oil stirring loss on the transmission box side caused by the transmission box working at low oil temperature for a long time, thereby ensuring high-efficiency operation of the transmission box.

[0082] The above cabin heating conditions and motor insulation conditions can be flexibly set by the developer. For example, the cabin heating condition can be set as follows: the cabin ambient temperature is less than the preset cabin ambient temperature threshold, or a cabin heating command issued by the user is received. The motor insulation condition can be set as follows: the motor running time is less than the preset motor running time threshold, and the motor temperature is less than the preset motor temperature threshold, or a motor insulation command issued by the user is received.

[0083] The controller in the embodiment of the present application is also used to control turning off the heating function of the heater if it is determined that the vehicle is in a pure electric working mode and that the vehicle meets the first low-temperature working condition based on the temperature information. If it is determined that the operating condition of the vehicle's motor meets the preset condition, the controller is used to control turning on the heating function of the heater if it is determined that the operating condition of the vehicle's motor does not meet the preset condition. The preset condition includes that the running time of the motor reaches a preset time and / or the motor is in a high-load working state.

[0084] Combine the following Figure 2 The above strategy 1 is introduced in detail.

[0085] Figure 2It is a partial structural schematic diagram of a vehicle thermal management system, wherein a drying bottle 25 is arranged on the pipeline between the built-in condenser 21 and the external condenser 22, a first solenoid valve SOV1 is arranged on the pipeline from the external condenser 22 to the drying bottle 25, a first electronic expansion valve EXV1 is arranged on the pipeline from the drying bottle 25 to the external condenser, a heat exchanger 16 is connected to the built-in condenser 21 through an electronic compressor 26 and a fifth solenoid valve SOV5, the heat exchanger 16 is also connected to the external condenser 22 through the electronic compressor 26 and a seventh solenoid valve SOV7, a fourth solenoid valve SOV4 is arranged on the pipeline between the first refrigerant transmission port of the heat exchanger 16 and the first end of the battery direct cooling and direct heating plate 19, and a fourth electronic expansion valve EXV1 is arranged on the pipeline between the second refrigerant transmission port of the heat exchanger 16 and the second end of the battery direct cooling and direct heating plate 19. V4 and the third electronic expansion valve EXV3, a third solenoid valve SOV3 is arranged between the first end of the battery direct cooling and direct heating plate 19 and the fifth solenoid valve SOV5, the second refrigerant transmission port of the heat exchanger 16 is connected to the drying bottle 25, and is connected to the second end of the air-conditioning evaporator 20 through the second electronic expansion valve EXV2, the first refrigerant transmission port of the heat exchanger 16 is connected to the first end of the air-conditioning evaporator 20, and a second solenoid valve SOV2 is arranged on the pipeline from the external condenser 22 to the heat exchanger 16, a sixth solenoid valve SOV6 is arranged between the output end of the first coolant transmission pipeline and the first connecting end of the seven-way valve 11, and a first water pump 27, a target motor device 28 and an oil cooler 29 are arranged on the second coolant transmission pipeline, and heat exchange with the target motor device 28 and the oil cooler 29 can be achieved through the coolant in the second coolant transmission pipeline.

[0086] The engine thermal management system 12 includes a high-temperature radiator 121 , a second water pump 122 , an engine block 123 , an engine cylinder head 124 , an electronic thermostat 125 , an EGR cooler 126 , a supercharger 127 , an oil cooler 128 , and a third water pump 129 .

[0087] Thermal management of the vehicle system can be achieved by controlling the seven-way valve 11 , each solenoid valve and the electronic expansion valve.

[0088] When the vehicle is in the pure electric working mode, and it is determined that the vehicle meets the first low-temperature working condition, and it is determined that the battery heating condition and the cabin heating condition are met, and it is determined that the operation of the motor of the vehicle meets the preset conditions:

[0089] Valve control: control the first connection end, the second connection end and the fifth connection end to be disconnected, and control the third connection end to be connected with the seventh connection end, and control the fourth connection end to be connected with the sixth connection end, control the solenoid valves SOV3 and SOV5 to be opened, the electronic expansion valves EXV3 and EXV4 to be opened, other solenoid valves and electronic expansion valves to be closed, and the oil cooler control valve to be opened.

[0090] Control of the heater 24: The heater 24 is controlled to be turned off.

[0091] Heat pump function control: control the heat pump function to start.

[0092] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Figure 3 As shown, the bold part in the figure is the pipeline connected to the coolant and the pipeline connected to the refrigerant, which reflects the direction of the coolant and the refrigerant in the pipeline. The heat generated by each motor component in the motor system at low temperature is transferred to the coolant through the oil cooler, so that the coolant temperature rises. When the coolant temperature in the motor thermal management system minus the minimum temperature of the battery pack cell>5°C, the seven-way valve 11, the electronic expansion valve and the solenoid valve are controlled in the above mode to realize the function of heating the battery pack and the cabin by utilizing the surplus of the motor system. The specific implementation method is: the heated coolant is circulated to the heat exchanger 16 through the electronic water pump. The heat exchanger 16 is essentially a heat exchanger between the coolant and the refrigerant. When the heat pump function is turned on, the heat exchanger 16 is equivalent to an evaporator, which continuously absorbs heat from the coolant, and then releases the heat to the cabin and the battery pack through the built-in condenser 21 and the battery direct cooling and direct heating plate 19, so that in the low-temperature pure electric mode, the cabin heating and battery heating can be realized without turning on the PTC heater 24 for heating.

[0093] When the vehicle is in the pure electric working mode, and it is determined that the vehicle meets the first low-temperature working condition, and it is determined that the battery heating condition is met, the cabin heating condition is not met, and it is determined that the operation of the vehicle's motor meets the preset conditions:

[0094] Valve control: control the first connection end, the second connection end and the fifth connection end to be disconnected, and control the third connection end to be connected with the seventh connection end, and control the fourth connection end to be connected with the sixth connection end, control the solenoid valve SOV3 to be opened, the electronic expansion valves EXV3 and EXV4 to be opened, the other solenoid valves and the electronic expansion valve to be closed, and the oil cooler control valve to be opened.

[0095] Control of the heater 24: The heater 24 is controlled to be turned off.

[0096] Heat pump function control: control the heat pump function to start.

[0097] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Figure 4As shown, the heat generated by each motor component in the motor system at low temperature is transferred to the coolant through the oil cooler, so that the coolant temperature rises. When the coolant temperature in the motor thermal management system minus the minimum temperature of the battery pack cell>5°C, the seven-way valve 11, the electronic expansion valve and the solenoid valve are controlled in the above mode, and the heated coolant is circulated to the heat exchanger 16 through the first water pump 27. When the heat pump function is turned on, the heat exchanger 16 is equivalent to an evaporator, which continuously absorbs heat from the coolant, and then releases the heat to the battery pack through the battery direct cooling and direct heating plate 19, thereby realizing the function of heating the battery pack by utilizing the surplus capacity of the motor system.

[0098] When the vehicle is in the pure electric working mode, and it is determined that the vehicle meets the first low temperature working condition, and it is determined that the motor insulation condition is met, and it is determined that the operation of the motor of the vehicle does not meet the preset condition:

[0099] Valve control: control the first connection end, the second connection end and the fifth connection end to be disconnected, and control the third connection end to be connected to the seventh connection end, and control the fourth connection end to be connected to the sixth connection end, control the solenoid valves SOV2 and SOV3 to be opened, the electronic expansion valves EXV1 and EXV3 to be opened, and other solenoid valves and electronic expansion valves to be closed, and the opening degree of the oil cooler control valve can be determined according to the temperature; in some embodiments, when the oil temperature is greater than the first preset oil temperature threshold, the oil cooler control valve can be controlled to be opened, and in the process of increasing the oil temperature, the opening degree of the oil cooler control valve is controlled to gradually increase, and when the oil temperature is greater than the second preset oil temperature threshold, the oil cooler control valve can be controlled to be fully opened; exemplarily, the first preset oil temperature threshold can be 20°C, and the second preset oil temperature threshold can be 40°C.

[0100] Control of the heater 24: The heater 24 is controlled to turn on.

[0101] Heat pump function control: control the heat pump function to start.

[0102] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Figure 5 As shown, in this mode, the oil cooler control valve is fully closed, so the motor gear oil does not undergo oil cooling, and heating is first achieved through the wind PTC, which absorbs ambient heat through the external condenser 22 to heat the battery, ensuring that the battery can quickly heat up to the normal operating temperature in a low temperature environment, thereby ensuring the high-efficiency operation of the entire system.

[0103] Strategy 2:

[0104] When the controller determines that the vehicle is in a pure electric operating mode and determines that the vehicle meets the first normal temperature operating condition based on the temperature information, the controller controls the sixth connection terminal and the seventh connection terminal to be disconnected, controls the third connection terminal to be connected to the fourth connection terminal, and controls the third connection terminal to be connected to the fifth connection terminal.

[0105] The first normal temperature working condition can be flexibly set by the developer, for example, it can be set to: the ambient temperature of the vehicle environment is 20℃~25℃. When the vehicle is in pure electric working mode and it is determined that the vehicle meets the first normal temperature working condition:

[0106] Valve control: control the sixth connection terminal and the seventh connection terminal to be disconnected, and control the third connection terminal to be connected to the fourth connection terminal, and control the third connection terminal to be connected to the fifth connection terminal; in this scenario, if it is determined that the battery needs to be cooled, for example, if it is determined that the battery pack temperature is greater than a preset battery pack temperature threshold, turn on the air conditioner to cool the battery pack, specifically: control the solenoid valves SOV4 and SOV7 to be opened, the electronic expansion valves EXV1 and EXV3 to be opened, the oil cooler control valve to be opened, and the other solenoid valves and the electronic expansion valve to be closed, so as to meet the heat dissipation requirements of the battery pack, thereby achieving the purpose of reducing the energy consumption of the entire vehicle.

[0107] Control of the heater 24: The heater 24 is controlled to be turned off.

[0108] Heat pump function control: control the heat pump function to turn off.

[0109] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Figure 6 As shown, in this mode, the seven-way valve 11 is controlled so that the hot water in the motor thermal management system does not pass through the heat exchanger 16 to avoid heating the battery. The coolant in the motor thermal management system is stabilized at a suitable operating temperature, such as 50°C, by proportional adjustment of the fourth connection terminal and the fifth connection terminal.

[0110] Strategy three: When the controller determines that the vehicle is in the pure electric operating mode and determines that the vehicle meets the first high-temperature operating condition based on the temperature information, the controller controls the fourth connection terminal, the sixth connection terminal and the seventh connection terminal to be disconnected, and controls the third connection terminal to be connected to the fifth connection terminal.

[0111] When the controller determines that the vehicle is in the pure electric working mode and that the vehicle meets the first high temperature working condition:

[0112] Valve control: control the fourth connection terminal, the sixth connection terminal and the seventh connection terminal to be disconnected, and control the third connection terminal to be connected to the fifth connection terminal; if the air conditioning of the cabin needs to be turned on and the battery needs to be cooled down at this time, control the solenoid valves SOV1, S0V4, SOV7 to be turned on, the electronic expansion valves EXV2 and EXV3 to be turned on, the other solenoid valves and the electronic expansion valve to be closed, and control the oil cooler control valve to be turned on.

[0113] Control of the heater 24: The heater 24 is controlled to be turned off.

[0114] Heat pump function control: control the heat pump function to turn off.

[0115] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Figure 7 As shown, in this mode, cabin cooling is achieved by opening the electronic expansion valve EXV2, while the electronic expansion valve EXV3 and the solenoid valve SOV4 are opened to cool the battery; by controlling the third connection terminal and the fifth connection terminal of the seven-way valve 11 to be connected, the coolant of the motor system can flow through the radiator 15 to achieve the cooling function.

[0116] Strategy 4: When the controller determines that the vehicle is in the hybrid operating mode and determines that the vehicle meets the second low-temperature operating condition based on the temperature information, the controller controls the first connection end to be connected to the second connection end, controls the third connection end to be connected to the seventh connection end, controls the fourth connection end to be connected to the sixth connection end, controls the fifth connection end to be disconnected, controls the first refrigerant transmission pipeline 17, the first pipeline branch and the second pipeline branch to be connected to the heat exchanger 16 respectively, and controls the heater 24 and the oil cooler control valve to be opened.

[0117] The second low-temperature working condition in the embodiment of the present application can be flexibly set by the developer, for example, it can be set to: the temperature of the coolant in the first coolant transmission pipeline is less than the first preset coolant temperature threshold, and the oil temperature of the motor gear oil is greater than the first preset oil temperature threshold. For example, the first preset coolant temperature threshold and the first preset oil temperature threshold here can be 20°C.

[0118] When the controller determines that the vehicle is in the hybrid working mode, that the vehicle meets the second low temperature working condition, and that the motor operation condition meets the preset condition:

[0119] Valve control: control the first connection end to be connected with the second connection end, control the third connection end to be connected with the seventh connection end, control the fourth connection end to be connected with the sixth connection end, control the disconnection of the fifth connection end, control the solenoid valves SOV3, SOV5 and SOV6 to be opened, the electronic expansion valves EXV2, EXV3 and EXV4 to be opened, and the other solenoid valves and electronic expansion valves to be closed. Similarly, the opening degree of the oil cooler control valve can be determined according to the temperature.

[0120] Control of the heater 24: control the heater 24 to turn on;

[0121] Heat pump function control: control the heat pump function to start;

[0122] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Figure 8As shown, in this mode, the temperature of the coolant in the engine thermal management system 12 can achieve rapid temperature rise, and heating is first achieved through the wind PTC. The heat generated by each motor component in the motor system at low temperature is transferred to the coolant through the oil cooler, so that the coolant temperature rises. When the coolant temperature in the motor thermal management system-the minimum temperature of the battery pack cell is greater than 5°C, the seven-way valve 11, the electronic expansion valve and the solenoid valve are controlled in the above mode to realize the function of utilizing the surplus of the motor system to heat the battery pack.

[0123] Strategy Five: When the controller determines that the vehicle is in the hybrid operating mode and determines that the vehicle meets the third low-temperature operating condition based on the temperature information, the controller controls the first connection end to be connected to the third connection end, controls the second connection end to be connected to the fourth connection end, controls the fifth connection end, the sixth connection end and the seventh connection end to be disconnected, controls the external condenser 22 to absorb ambient heat, controls the second pipeline branch and the third pipeline branch to be connected to the first refrigerant transmission pipeline 17 respectively, controls the first refrigerant transmission pipeline 17 and the heat exchanger 16 to be disconnected, controls the heater 24 to be turned on, and controls the oil cooler control valve to be fully closed.

[0124] The third low-temperature working condition in the embodiment of the present application can be flexibly set by the developer, for example, it can be set to: the temperature of the coolant in the first coolant transmission pipeline is less than the second preset coolant temperature threshold, and the oil temperature of the motor gear oil is less than the second preset oil temperature threshold. For example, the second preset coolant temperature threshold and the second preset oil temperature threshold here can be 20°C.

[0125] When the controller determines that the vehicle is in the hybrid working mode and that the vehicle meets the third low temperature working condition, and the motor operation condition does not meet the preset condition:

[0126] Valve control: control the first connection end to be connected with the third connection end, control the second connection end to be connected with the fourth connection end, control the fifth connection end, the sixth connection end and the seventh connection end to be disconnected, control the solenoid valves SOV2, SOV3, SOV6 and SOV5 to be opened, and control the electronic expansion valves EXV1 and EXV3 to be opened, and control other solenoid valves and the electronic expansion valve to be closed. At this time, the oil cooler control valve is controlled to be fully closed. When the oil temperature is greater than the second preset oil temperature threshold, the oil cooler control valve is opened, and as the oil temperature increases, the opening of the oil cooler control valve is controlled to gradually increase.

[0127] Control of the heater 24: The heater 24 is controlled to turn on.

[0128] Heat pump function control: control the heat pump function to start.

[0129] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Fig. 9 As shown, in this mode, the oil cooler control valve is closed. At this time, the motor gear oil does not pass through the oil cooler. The coolant in the engine thermal management system 12 and the motor thermal management system can be heated up quickly. The heating is first achieved through the wind PTC. By controlling the closing of the oil cooler control valve, the heat generated by the motor system at low temperature causes the oil temperature to rise rapidly, and the heat generated by the engine causes the coolant temperature to rise rapidly. When the ambient temperature is greater than the preset ambient temperature threshold, such as greater than -10°C, the ambient heat is absorbed by the external condenser 22 to heat the battery, ensuring that the battery can be quickly heated to the normal operating temperature in a low temperature environment.

[0130] Strategy six: When the controller determines that the vehicle is in the hybrid operating mode and determines that the vehicle meets the fourth low-temperature operating condition based on the temperature information, the controller controls the first connection end to be connected with the seventh connection end, controls the second connection end to be connected with the fourth connection end, controls the third connection end to be connected with the sixth connection end, controls the fifth connection end to be disconnected, controls the first refrigerant transmission pipeline 17 and the second pipeline branch to be connected with the heat exchanger 16 respectively, controls the heater 24 to be closed, and controls the oil cooler control valve to be opened.

[0131] The fourth low-temperature working condition in the embodiment of the present application can also be flexibly set by the developer, for example, it can be set to: the temperature of the coolant in the engine thermal management system 12 is within a preset first temperature range, for example, 20°C ≤ engine coolant temperature < 40°C.

[0132] When the controller determines that the vehicle is in the hybrid working mode, determines that the vehicle meets the fourth low temperature working condition, and the motor operation condition meets the preset condition:

[0133] Valve control: control the first connection end to be connected with the seventh connection end, control the second connection end to be connected with the fourth connection end, control the third connection end to be connected with the sixth connection end, and control the fifth connection end to be disconnected, control the solenoid valves SOV3 and SOV5 to be opened, the electronic expansion valves EXV3 and EXV4 to be opened, other solenoid valves and electronic expansion valves to be closed, and control the oil cooler control valve to be opened.

[0134] Control of the heater 24: The heater 24 is controlled to be turned off.

[0135] Heat pump function control: control the heat pump function to start.

[0136] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Fig.10As shown, in this mode, a large series connection of the system is realized. In this mode, the engine coolant can be quickly heated up by turning on the heat pump function to realize the functions of cabin heating and battery heating. The specific implementation is as follows: the heat generated by the motor system at low temperature is transferred to the coolant through the oil cooler, so that the coolant temperature rises, and the heated coolant is circulated to the heat exchanger 16 and the engine thermal management system 12 through the water pump. When the heat pump function is turned on, the heat exchanger 16 is equivalent to an evaporator, which continuously absorbs heat from the coolant and releases the heat to the cabin and the battery, thereby realizing cabin heating, battery heating functions and rapid temperature rise of the engine coolant in the low-temperature hybrid mode without turning on the PTC heating.

[0137] Strategy seven: When the controller determines that the vehicle is in the hybrid operating mode and determines that the vehicle meets the fifth low-temperature operating condition based on the temperature information, the controller controls the first connection end to be connected with the seventh connection end, controls the second connection end to be connected with the fourth connection end, controls the third connection end to be connected with the sixth connection end, controls the fifth connection end to be disconnected, controls the first refrigerant transmission pipeline 17 to be connected with the heat exchanger 16, controls the air conditioning heater core 23 to heat the vehicle cabin and / or the battery, controls the heater 24 to be turned off, and controls the oil cooler control valve to be opened.

[0138] The fifth low-temperature working condition in the embodiment of the present application can also be flexibly set by the developer, for example, it can be set to: the temperature of the coolant in the engine thermal management system 12 is within a preset second temperature range, for example, 40°C ≤ engine coolant temperature < 65°C.

[0139] When the controller determines that the vehicle is in the hybrid working mode and determines, based on the temperature information, that the vehicle meets a fifth low-temperature working condition:

[0140] Valve control: control the first connection end to be connected with the seventh connection end, control the second connection end to be connected with the fourth connection end, control the third connection end to be connected with the sixth connection end, and control the fifth connection end to be disconnected, control the solenoid valves SOV3 and SOV6 to be opened, control the electronic expansion valves EXV3 and EXV4 to be opened, close other solenoid valves and electronic expansion valves, and open the oil cooler control valve.

[0141] Control of the heater 24: The heater 24 is controlled to be turned off.

[0142] Heat pump function control: control the heat pump function to start.

[0143] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Fig.11As shown, in this mode, a large series connection of the system is realized. In this mode, the waste heat of the engine is used to realize the functions of cabin heating and battery heating by using the heat pump function when the PTC is turned off, which can realize the rapid temperature rise of the transmission water temperature. The specific implementation is as follows: the heat generated by the engine cylinder at low temperature causes the coolant temperature to rise, and heats the cabin through the heater core; the heated coolant is circulated to the heat exchanger 16 and the motor thermal management system through the water pump, realizing the series connection of the system and making the motor coolant temperature rise rapidly; when the heat pump function is turned on, the heat exchanger 16 is equivalent to an evaporator, which continuously absorbs heat from the coolant and releases the heat to the battery heating circuit, thereby realizing cabin heating, battery heating function and rapid temperature rise of the motor coolant in the low-temperature hybrid mode without turning on the PTC heating.

[0144] Strategy eight: When the controller determines that the vehicle is in the hybrid operating mode and determines that the vehicle meets the sixth low-temperature operating condition based on the temperature information, the controller controls the first connection end to be connected to the seventh connection end, controls the second connection end to be connected to the sixth connection end, controls the third connection end to be connected to the fourth connection end and the fifth connection end respectively, controls the first refrigerant transmission pipeline 17 to be connected to the heat exchanger 16, controls the air conditioning heater core 23 to heat the vehicle cabin and / or the battery, controls the heater 24 to be turned off, and controls the oil cooler control valve to be opened.

[0145] The fifth low temperature working condition in the embodiment of the present application can also be flexibly set by the developer, for example, it can be set to: the temperature of the coolant in the engine thermal management system 12 is within a preset third temperature range, for example, 65°C ≤ engine coolant temperature < 95°C.

[0146] When the controller determines that the vehicle is in the hybrid working mode and determines, based on the temperature information, that the vehicle meets a sixth low-temperature working condition:

[0147] Valve control: control the first connection end to be connected with the seventh connection end, control the second connection end to be connected with the sixth connection end, control the third connection end to be connected with the fourth connection end and the fifth connection end respectively, control the first refrigerant transmission pipeline 17 to be connected with the heat exchanger 16, control the solenoid valves SOV3 and SOV6 to be opened, the electronic expansion valves EXV3 and EXV4 to be opened, other solenoid valves and electronic expansion valves to be closed, and control the oil cooler control valve to be opened.

[0148] Control of the heater 24: The heater 24 is controlled to be turned off.

[0149] Heat pump function control: control the heat pump function to start.

[0150] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Fig.12 As shown, the opening of the oil cooler control valve can be determined according to the temperature. For example, when the oil temperature is greater than the first preset oil temperature threshold, the oil cooler control valve can be controlled to open, and in the process of increasing the oil temperature, the opening of the oil cooler control valve can be controlled to gradually increase. When the oil temperature is greater than the second preset oil temperature threshold, the oil cooler control valve can be controlled to be fully opened. In this mode, the residual heat of the engine is used to realize the functions of cabin heating and battery heating. The specific implementation is as follows: the heat generated by the engine cylinder at low temperature causes the coolant temperature to rise, and the cabin is heated through the heater core; the heated coolant is circulated to the heat exchanger 16 through the water pump; when the heat pump function is turned on, the heat exchanger 16 is equivalent to an evaporator, which continuously absorbs heat from the coolant and releases the heat to the battery heating circuit, so that in the hybrid mode, the cabin heating and battery heating functions can be realized without turning on the PTC heating.

[0151] Strategy nine: When the controller determines that the vehicle is in the hybrid operating mode and determines that the vehicle meets the seventh low-temperature operating condition based on the temperature information, the controller controls the fourth connection end to be connected with the sixth connection end, controls the third connection end to be connected with the seventh connection end, controls the first connection end, the second connection end and the fifth connection end to be disconnected, controls the first refrigerant transmission pipeline 17 and the second pipeline branch to be connected with the heat exchanger 16 respectively, and controls the opening of the oil cooler control valve.

[0152] The fifth low-temperature working condition in the embodiment of the present application can also be flexibly set by the developer, for example, it can be set to: the temperature of the coolant in the engine thermal management system 12 is within a preset fourth temperature range, for example, 95°C ≤ engine coolant temperature.

[0153] When the controller determines that the vehicle is in the hybrid working mode and determines, based on the temperature information, that the vehicle meets a seventh low-temperature working condition:

[0154] Valve control: control the fourth connection end to be connected with the sixth connection end, control the third connection end to be connected with the seventh connection end, and control the first connection end, the second connection end and the fifth connection end to be disconnected; control the solenoid valves SOV3, SOV5, and SOV6 to be opened, the electronic expansion valves EXV3 and EXV4 to be opened, the other solenoid valves and the electronic expansion valve to be closed, and control the oil cooler control valve to be opened.

[0155] Control of the heater 24: The heater 24 is controlled to be turned off.

[0156] Heat pump function control: control the heat pump function to start.

[0157] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Fig.13 As shown, in this mode, the waste heat of the engine is used to achieve cabin heating, and the waste heat of the motor is used to heat the battery pack. The specific implementation is as follows: the heat generated by the motor system at low temperature is transferred to the coolant through the oil cooler, so that the temperature of the coolant rises, and the heated coolant is circulated to the heat exchanger 16 through the water pump. When the heat pump function is turned on, the heat exchanger 16 is equivalent to an evaporator, which continuously absorbs heat from the coolant and releases the heat to the battery pack; the engine coolant heats the cabin through the heater core, thereby achieving cabin heating and battery heating functions in low-temperature hybrid mode without turning on PTC heating.

[0158] Strategy 10: When the controller determines that the vehicle is in the hybrid operating mode and determines that the vehicle meets the second normal temperature operating condition based on the temperature information, the controller controls the first connection end to be connected to the second connection end, controls the third connection end to be connected to the fourth connection end and the fifth connection end respectively, and controls the sixth connection end and the seventh connection end to be disconnected.

[0159] When the controller determines that the vehicle is in the hybrid operating mode and determines, based on the temperature information, that the vehicle meets a second normal temperature operating condition:

[0160] Valve control: control the first connection end to be connected with the second connection end, control the third connection end to be connected with the fourth connection end and the fifth connection end respectively, and control the sixth connection end and the seventh connection end to be disconnected; in this scenario, when it is determined that the air conditioner needs to be turned on to cool the battery, the solenoid valves SOV2, SOV4 and SOV7 are controlled to be opened, the electronic expansion valves EXV1, EXV2 and EXV3 are controlled to be opened, the other solenoid valves and the electronic expansion valve are closed, and the oil cooler control valve is controlled to be opened.

[0161] Control of the heater 24: The heater 24 is controlled to be turned off.

[0162] Heat pump function control: control the heat pump function to turn off.

[0163] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Fig.14 As shown, in this mode, the seven-way valve 11 is controlled so that the coolant of the engine and the motor does not pass through the heat exchanger 16 to avoid heating the battery. The motor coolant is stabilized to a suitable operating temperature, such as 50°C, by proportional adjustment of the fourth connection end and the fifth connection end of the seven-way valve 11; the engine coolant is stabilized to a suitable operating temperature, such as 90°C, by proportional adjustment of the flow rate of the electronic thermostat on the engine side.

[0164] Strategy eleven: When the controller determines that the vehicle is in the hybrid operating mode and determines that the vehicle meets the second high-temperature operating condition based on the temperature information, the controller controls the third connection end and the fifth connection end to be connected, and controls the first connection end, the second connection end, the fourth connection end, the sixth connection end and the seventh connection end to be disconnected.

[0165] When the controller determines that the vehicle is in the hybrid working mode and determines, based on the temperature information, that the vehicle meets a second high temperature working condition:

[0166] Valve control: control the third connection end and the fifth connection end to be connected, and control the first connection end, the second connection end, the fourth connection end, the sixth connection end and the seventh connection end to be disconnected, control the solenoid valves SOV2, SOV4 and SOV7 to be opened, the electronic expansion valves EXV1, EXV2 and EXV3 to be opened, other solenoid valves and electronic expansion valves to be closed, and the oil cooler control valve to be opened.

[0167] Control of the heater 24: The heater 24 is controlled to be turned off.

[0168] Heat pump function control: control the heat pump function to turn off.

[0169] At this time, please refer to the schematic diagram of the working status of the vehicle thermal management system Fig.15 As shown, in this mode, the seven-way valve 11 is controlled so that the coolant of the engine and the motor does not pass through the heat exchanger 16 to avoid heating the battery. In this mode, the air-conditioning system is used: the solenoid valves SOV2, SOV4 and SOV7 are opened, and the electronic expansion valves EXV1, EXV2 and EXV3 are opened to achieve cabin cooling and battery cooling; the electronic thermostat is controlled to enable the engine coolant to flow to the high-temperature radiator 15 to achieve cooling of the engine coolant; the third connection end and the fifth connection end of the seven-way valve 11 are controlled to be connected, so that the coolant of the motor system flows through the radiator 15 for cooling.

[0170] The embodiment of the present application realizes efficient heat management of the three major systems of engine, motor and battery by setting a seven-way valve on the coolant side, thereby improving the working efficiency of the engine, motor, battery and transmission; a heat exchanger is added to the battery cabin thermal management system, and in low-temperature vehicle use scenarios, the direct heat pump function can absorb heat from the engine cooling circuit, motor cooling circuit and atmospheric environment in three modes for cabin heating and battery heating. The heat pump efficiency is not affected by the low-temperature environment, which improves the low-temperature cruising range in short-distance pure electric mode or hybrid mode, improves the low-temperature cruising range, and expands the use scenarios of heat pumps at extremely low temperatures; an oil cooler control valve is added in front of the oil cooler to control the opening of the solenoid valve at different oil temperatures, which can achieve rapid heating of the motor oil side and improve low-temperature performance.

[0171] It should be understood that, although the various steps in the above-mentioned flow chart are displayed in sequence according to the indication of the arrows, these steps are not necessarily executed in sequence according to the order indicated by the arrows. Unless there is a clear explanation in this article, the execution of these steps is not strictly limited in order, and these steps can be executed in other orders. Moreover, at least a part of the steps in the above-mentioned flow chart may include a plurality of sub-steps or a plurality of stages, and these sub-steps or stages are not necessarily executed at the same time, but can be executed at different times, and the execution order of these sub-steps or stages is not necessarily to be carried out in sequence, but can be executed in turn or alternately with other steps or at least a part of the sub-steps or stages of other steps.

[0172] It should be noted that the diagram provided in the present embodiment only illustrates the basic concept of the present invention in a schematic manner, so the diagram only shows the components related to the present invention rather than drawing according to the number, shape and size of the components during actual implementation. The type, quantity and ratio of each component during actual implementation can be a random change, and the component layout type may also be more complicated. The structure, ratio, size, etc. illustrated in the drawings of the present specification are only used to match the content disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions that the present invention can implement, so they have no technical substantive significance. Any modification of the structure, change of the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effect that the present invention can produce and the purpose that can be achieved. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of narration, and are not used to limit the scope of the present invention. The change or adjustment of its relative relationship should also be regarded as the scope of the present invention without substantially changing the technical content.

[0173] The technical features of the above embodiments may be combined arbitrarily. 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.

[0174] The above-mentioned 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.

Claims

1. A vehicle thermal management system, characterized in that: include: Seven-way valve, engine thermal management system, motor thermal management system, battery cabin thermal management system and controller; Wherein, the engine thermal management system comprises a first coolant transmission pipeline, the output end of the first coolant transmission pipeline is connected to the first connection end of the seven-way valve, and the input end of the first coolant transmission pipeline is connected to the second connection end of the seven-way valve; The motor thermal management system includes a second coolant transmission pipeline connected to the third connection end of the seven-way valve, a third coolant transmission pipeline and a fourth coolant transmission pipeline connected to the output end of the second coolant transmission pipeline; the second coolant transmission pipeline is used to cool the target motor device and the oil cooler; an intercooler is provided on the third coolant transmission pipeline, and the output end of the third coolant transmission pipeline is connected to the fourth connection end of the seven-way valve; a radiator is provided on the fourth coolant transmission pipeline, and the output end of the fourth coolant transmission pipeline is connected to the fifth connection end of the seven-way valve; The battery cabin thermal management system includes a heat exchanger, a first refrigerant transmission pipeline and a second refrigerant transmission pipeline connected between two refrigerant transmission ports of the heat exchanger, the two coolant transmission ports of the heat exchanger are respectively connected to the sixth connection end and the seventh connection end of the seven-way valve, the first refrigerant transmission pipeline is used to exchange heat with the battery of the vehicle, and the second refrigerant transmission pipeline is used to exchange heat with the cabin of the vehicle; The controller is used to control the communication mode of the seven-way valve according to the current driving condition of the vehicle.

2. The vehicle thermal management system according to claim 1, characterized in that: The vehicle thermal management system further includes an oil cooler control valve, which is used to control the amount of motor gear oil entering the oil cooler for heat exchange.

3. The vehicle thermal management system according to claim 2, characterized in that: The controller is used to control the connection mode of the seven-way valve according to the current working mode and temperature information of the vehicle; the temperature information includes at least one of the ambient temperature of the current environment of the vehicle and the component temperature of the target component of the vehicle.

4. The vehicle thermal management system according to claim 3, characterized in that: A battery direct cooling and heating plate is arranged on the first refrigerant transmission pipeline, and the second refrigerant transmission pipeline includes a first pipeline branch provided with an air-conditioning evaporator, a second pipeline branch provided with a built-in condenser, and a third pipeline branch provided with an external condenser in parallel; an air-conditioning heater core is arranged between the output end of the first coolant transmission pipeline and the first connection end; the vehicle thermal management system also includes a heater for heating the air-conditioning heater core.

5. The vehicle thermal management system according to claim 4, characterized in that: The controller is used to control the first connection terminal and the second connection terminal to be disconnected when it is determined that the vehicle is in a pure electric operating mode, and to control the connection mode between the third connection terminal, the fourth connection terminal, the fifth connection terminal, the sixth connection terminal and the seventh connection terminal according to the temperature information.

6. The vehicle thermal management system according to claim 5, characterized in that: The controller is used to control the fifth connection end to be disconnected, control the third connection end to be connected to the seventh connection end, and control the fourth connection end to be connected to the sixth connection end when it is determined that the vehicle is in a pure electric working mode and the vehicle meets a first low-temperature working condition according to the temperature information; and / or, The controller is used to control the sixth connection terminal and the seventh connection terminal to be disconnected, and control the third connection terminal to be connected to the fourth connection terminal, and control the third connection terminal to be connected to the fifth connection terminal, when it is determined that the vehicle is in a pure electric working mode and the vehicle meets a first normal temperature working condition according to the temperature information; and / or, The controller is used to control the fourth connection terminal, the sixth connection terminal and the seventh connection terminal to be disconnected, and control the third connection terminal to be connected to the fifth connection terminal when it is determined that the vehicle is in a pure electric operating mode and when it is determined based on the temperature information that the vehicle meets a first high-temperature operating condition.

7. The vehicle thermal management system according to claim 6, characterized in that: The controller is used to control the first refrigerant transmission pipeline to be connected to the heat exchanger and control the opening of the oil cooler control valve when it is determined that the vehicle is in a pure electric working mode, and when it is determined according to the temperature information that the vehicle meets a first low-temperature working condition, and when it is determined that the vehicle meets a battery heating condition; and / or, The controller is used for controlling the first pipeline branch and the second pipeline branch to be connected to the heat exchanger respectively, and controlling the oil cooler control valve to be opened when it is determined that the vehicle is in a pure electric working mode, and when it is determined that the vehicle meets a first low-temperature working condition according to the temperature information, and when it is determined that the vehicle meets a cabin heating condition; and / or, The controller is used to control the external condenser to absorb ambient heat, control the third pipeline branch to be connected to the first refrigerant transmission pipeline, and control the oil cooler control valve to be fully closed when it is determined that the vehicle is in a pure electric operating mode, and determines based on the temperature information that the vehicle meets the first low-temperature operating condition, and determines that the vehicle meets the motor insulation condition.

8. The vehicle thermal management system according to claim 7, characterized in that: The battery heating condition includes: the temperature of the battery of the vehicle is less than a first preset temperature threshold, and the difference between the temperature of the coolant in the motor thermal management system and the temperature of the battery is greater than a second preset temperature threshold.

9. The vehicle thermal management system according to claim 7, characterized in that: The controller is also used to, when it is determined that the vehicle is in a pure electric operating mode and, based on the temperature information, determines that the vehicle meets a first low-temperature operating condition, control turning off the heating function of the heater if it is determined that the operating condition of the motor of the vehicle meets a preset condition, and control turning on the heating function of the heater if it is determined that the operating condition of the motor does not meet the preset condition; the preset conditions include that the operating time of the motor reaches a preset time and / or the motor is in a high-load working state.

10. The vehicle thermal management system according to claim 7, characterized in that: The controller is further configured to, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a second low-temperature working condition, control the first connection end to be connected to the second connection end, control the third connection end to be connected to the seventh connection end, control the fourth connection end to be connected to the sixth connection end, control the disconnection of the fifth connection end, control the first refrigerant transmission pipeline, the first pipeline branch, and the second pipeline branch to be connected to the heat exchanger respectively, and control the opening of the heater and the oil cooler control valves; and / or, The controller is used for, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a third low-temperature working condition, controlling the first connection end to be connected to the third connection end, controlling the second connection end to be connected to the fourth connection end, controlling the fifth connection end, the sixth connection end and the seventh connection end to be disconnected, controlling the external condenser to absorb ambient heat, controlling the second pipeline branch and the third pipeline branch to be connected to the first refrigerant transmission pipeline respectively, controlling the first refrigerant transmission pipeline to be disconnected from the heat exchanger, controlling the heater to be turned on, and controlling the oil cooler control valve to be fully closed; and / or, The controller is used for, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a fourth low-temperature working condition, controlling the first connection end to be connected to the seventh connection end, controlling the second connection end to be connected to the fourth connection end, controlling the third connection end to be connected to the sixth connection end, controlling the fifth connection end to be disconnected, controlling the first refrigerant transmission pipeline and the second pipeline branch to be connected to the heat exchanger respectively, controlling the heater to be turned off, and controlling the oil cooler control valve to be opened; and / or, The controller is used for, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a fifth low-temperature working condition, controlling the first connection end to be connected to the seventh connection end, controlling the second connection end to be connected to the fourth connection end, controlling the third connection end to be connected to the sixth connection end, and controlling the fifth connection end to be disconnected, controlling the first refrigerant transmission pipeline to be connected to the heat exchanger, controlling the air conditioning heater core to heat the cabin of the vehicle and / or the battery, controlling to turn off the heater, and controlling to open the oil cooler control valve; and / or The controller is used for, when it is determined that the vehicle is in a hybrid working mode and it is determined according to the temperature information that the vehicle meets a sixth low-temperature working condition, controlling the first connection end to be connected to the seventh connection end, controlling the second connection end to be connected to the sixth connection end, controlling the third connection end to be connected to the fourth connection end and the fifth connection end respectively, controlling the first refrigerant transmission pipeline to be connected to the heat exchanger, controlling the air conditioning heater core to heat the cabin of the vehicle and / or the battery, controlling to turn off the heater, and controlling to open the oil cooler control valve; and / or, The controller is used for controlling the fourth connection end to be connected with the sixth connection end, controlling the third connection end to be connected with the seventh connection end, controlling the first connection end, the second connection end and the fifth connection end to be disconnected, controlling the first refrigerant transmission pipeline and the second pipeline branch to be connected with the heat exchanger respectively, and controlling the oil cooler control valve to be opened when it is determined that the vehicle is in a hybrid working mode and the vehicle meets a seventh low-temperature working condition according to the temperature information; and / or, The controller is used to control the first connection end to be connected with the second connection end, control the third connection end to be connected with the fourth connection end and the fifth connection end respectively, and control the sixth connection end to be disconnected from the seventh connection end when it is determined that the vehicle is in a hybrid working mode and the vehicle meets a second normal temperature working condition according to the temperature information; and / or, The controller is used to control the third connection end and the fifth connection end to be connected, and control the first connection end, the second connection end, the fourth connection end, the sixth connection end and the seventh connection end to be disconnected when it is determined that the vehicle is in a hybrid operating mode and that the vehicle meets a second high-temperature operating condition based on the temperature information.

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