Thermal management control method and thermal management control system of vehicle

Abstract

The invention provides a thermal management control method and system for a vehicle, and the method comprises the steps: recognizing whether a battery of the vehicle has a heating demand or not; if the battery has the heating requirement, the working state of a power source of the vehicle is recognized, and whether the vehicle meets the waste heat heating condition or not is judged according to the recognized working state; if the waste heat heating condition is met, waste heat of the power source is used for heating the battery; if the waste heat heating condition is not met, whether a starting condition for starting a heat pump system of the vehicle is met or not is determined according to the temperature of the environment where the vehicle is located; if the starting condition is met, an evaporator in the heat pump system is started to heat the battery; and if the starting condition is not met, a battery loop PTC and a water heating electric heating WPTC of the vehicle are started to heat the battery. By means of the waste heat recovery system, the waste heat recovery efficiency and utilization rate are improved, and then the purposes of energy conservation and emission reduction are achieved.

Description

Technical Field

[0001] The present application relates to the field of automotive thermal management technology, and in particular to a thermal management control method and a thermal management control system for a vehicle. Background Art

[0002] Current technology integrates multiple heat sources of hybrid vehicles and extended-range vehicles, utilizes the on-off regulation of the air heater PTC (Positive Temperature Coefficient) in the coolant circulation loop, and the precise management of the flow direction of the three-way valve and four-way valve to achieve cooling of the electric drive system, as well as cooling or heating of the passenger compartment and battery pack.

[0003] However, the heat exchange between different heat cycle loops under this technical framework is relatively limited, which hinders the efficient and optimal use of energy. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a vehicle thermal management control method and a thermal management control system, aiming to improve the efficiency and utilization rate of waste heat recovery.

[0005] In a first aspect, the present application provides a thermal management control method for a vehicle, the method comprising: identifying whether a battery of the vehicle has a heating demand; if the battery has a heating demand, identifying the working state of the power source of the vehicle, and judging whether the vehicle meets the waste heat heating condition based on the identified working state; if the waste heat heating condition is met, using the waste heat of the power source to heat the battery; if the waste heat heating condition is not met, determining whether the start-up condition for starting the heat pump system of the vehicle is met based on the ambient temperature of the vehicle; if the start-up condition is met, starting the evaporator in the heat pump system to heat the battery; if the start-up condition is not met, starting the battery circuit PTC and the water heating electric heating WPTC of the vehicle to heat the battery.

[0006] In a possible implementation, the power source includes an engine and an electric drive, and the waste heat heating condition includes a first waste heat heating condition and a second waste heat heating condition, which further includes: when the working state of the engine is a running state, determining that the vehicle satisfies the first waste heat heating condition so as to use the waste heat of the engine to heat the battery; when the working state of the electric drive is a running state, determining that the vehicle satisfies the second waste heat heating condition so as to use the waste heat of the electric drive to heat the battery.

[0007] In one possible embodiment, the waste heat of the engine is used to heat the battery in the following manner: when the vehicle meets the first waste heat heating condition, the first and second ports of the first three-way valve on the engine heating circuit are controlled to be connected, the first and second ports of the second three-way valve on the engine heating circuit are controlled to be connected, and the warm air shut-off valve on the engine heating circuit is controlled to be connected, so as to heat the engine heating circuit with the waste heat of the engine, so that the heat in the engine heating circuit enters the plate heat exchanger arranged on the engine heating circuit via the second three-way valve and the warm air shut-off valve, and at the same time, the first and second ports of the four-way valve on the battery heating circuit are controlled to be connected, and the first and second ports of the third three-way valve on the battery heating circuit are controlled to be connected, so that the heat in the plate heat exchanger provides heat to the battery via the battery heating circuit, so as to heat the battery with the waste heat of the engine.

[0008] In one possible embodiment, the waste heat of the electric drive is used to heat the battery in the following manner: the first and second ports of the third three-way valve on the battery heating circuit are controlled to be connected, all ports on the four-way valve on the battery heating circuit are controlled to be connected, and the first and second ports of the fourth three-way valve on the electric drive heating circuit are controlled to be connected, so as to heat the electric drive heating circuit with the waste heat of the electric drive, so that the heat in the electric drive heating circuit enters the plate heat exchanger arranged on the engine heating circuit via the fourth three-way valve, the four-way valve and the third three-way valve, so that the heat in the plate heat exchanger provides heat to the battery via the battery heating circuit, so as to heat the battery with the waste heat of the electric drive.

[0009] In a possible implementation, it also includes: in response to a heating request for the passenger cabin of the vehicle, identifying the operating state of the engine of the vehicle, and judging whether the vehicle meets the first waste heat heating condition according to the identified operating state; if the first waste heat heating condition is met, controlling the heater cut-off valve on the engine heating circuit to be turned on, controlling the first port and the third port of the first three-way valve on the engine heating circuit to be turned on, and controlling the first port and the second port of the second three-way valve on the engine heating circuit to be turned on, so as to heat the engine heating circuit with the waste heat of the engine, so that the heat in the engine heating circuit enters the HVAC cabin heater core arranged on the engine heating circuit through the second three-way valve and the heater cut-off valve, so as to heat the passenger cabin with the waste heat of the engine; if the first waste heat heating condition is not met, If the engine waste heat heating condition is met, it is determined whether the vehicle meets the starting condition, and the starting condition indicates that the ambient temperature of the vehicle is within a preset temperature range; if the starting condition is met, the heat pump four-way reversing valve on the cabin heating circuit is controlled to be turned on, the evaporator on the cabin heating circuit is controlled to be started, the passenger compartment refrigeration stop valve on the cabin heating circuit is controlled to be turned on, and the thermal expansion valve on the cabin heating circuit is controlled to be turned on, so as to heat the cabin through the evaporator, so that the heat generated by the evaporator enters the HVAC cabin heater core in the cabin heating circuit through the passenger compartment refrigeration stop valve and the thermal expansion valve, so as to heat the cabin through the evaporator; if the starting condition is not met, the wind heating electric heating PTC and the water heating electric heating WPTC of the vehicle are started to heat the cabin.

[0010] In a possible implementation, the step of starting the battery circuit PTC and the water-heating electric heating WPTC of the vehicle to heat the battery includes: controlling the first and second ports of the four-way valve on the battery heating circuit to be connected, controlling the first and second ports of the third three-way valve on the battery heating circuit to be connected, and controlling the first electronic water pump on the battery heating circuit and the battery circuit PTC to be turned on, so that the heat provided by the battery circuit PTC flows through the battery to heat the battery; when receiving an instruction to turn on the water-heating electric heating WPTC, controlling the water-heating electric heating WPTC and the second electronic water pump on the water-heating electric heating circuit to be turned on, controlling the first and second ports of the first three-way valve on the engine heating circuit to be connected, controlling the first and second ports of the second three-way valve to be connected, and controlling the warm air shut-off valve to be turned on, so that the water-heating electric heating WPTC and the battery circuit PTC jointly heat the battery.

[0011] In a possible implementation, it also includes: in response to the cooling demand for the passenger cabin of the vehicle, controlling the HVAC cabin evaporator, the first fan, the compressor and the condenser on the passenger cabin cooling circuit to turn on, controlling the heat pump four-way reversing valve, the passenger cabin refrigeration shut-off valve and the thermal expansion valve on the passenger cabin cooling circuit to be turned on, compressing and condensing the refrigerant through the heat pump four-way reversing valve, the compressor and the condenser to obtain liquid refrigerant, so that the liquid refrigerant enters the HVAC cabin evaporator after being regulated by the thermal expansion valve, and blowing the cooled air in the HVAC cabin evaporator into the passenger cabin through the first fan to provide cooling for the passenger cabin.

[0012] In a possible implementation, it also includes: identifying whether the battery has a cooling demand; if the battery has a cooling demand, controlling the first and second ports of the four-way valve on the battery cooling circuit to be connected, controlling the first and third ports of the third three-way valve on the battery cooling circuit to be connected, and controlling the battery circuit radiator, the second fan, the third electronic water pump and the fourth electronic water pump on the battery cooling circuit to be turned on, so as to provide cooling through the battery circuit radiator, so that the cooling energy flows through the battery through the drive of the third electronic water pump and the fourth electronic water pump and absorbs the heat of the battery, so as to cool the battery through the battery circuit radiator; when the temperature of the electric drive is lower than the temperature of the battery, controlling the third port of the third three-way valve to be closed, and controlling the battery circuit radiator and the third electronic water pump to be closed, and at the same time controlling all ports of the four-way valve to be connected, controlling the second port of the third three-way valve to be connected, and controlling the electric drive circuit radiator, the third fan and the fifth electronic water pump of the electric drive cooling circuit to be turned on , and controlling the first and second ports of the fourth three-way valve to be turned on, so as to provide cooling capacity through the electric drive circuit radiator, so that the cooling capacity flows through the four-way valve, the third three-way valve, and the fourth electronic water pump on the electric drive cooling circuit through the driving of the fifth electronic water pump, flows through the battery and absorbs the heat of the battery, so as to cool the battery through the electric drive circuit radiator; when the battery circuit radiator and the electric drive circuit radiator cannot meet the cooling demand of the battery, the third and fourth ports of the four-way valve are controlled to be closed, the fourth three-way valve is controlled to be closed, the electric drive circuit radiator and the third fan are controlled to be closed, the fifth electronic water pump and the fourth three-way valve are controlled to be closed, and the heat pump four-way reversing valve and the electronic expansion valve on the cabin cooling circuit are controlled to be turned on, the compressor, the battery cooler and the first electronic water pump on the battery cooling circuit are controlled to be turned on, the first and second ports of the four-way valve are controlled to be turned on, and the first and second ports of the third three-way valve are controlled to be turned on, so as to cool the battery through the battery cooler.

[0013] In a possible implementation, it also includes: identifying whether the electric drive of the vehicle has a cooling demand; if the electric drive has a cooling demand, controlling the electric drive circuit radiator, the third fan and the fifth electronic water pump of the electric drive cooling circuit to be turned on, and controlling the fourth three-way valve to be turned on, so as to provide cooling through the electric drive circuit radiator, so that the cooling energy flows through the electric drive via the fifth electronic water pump 1 on the electric drive cooling circuit and the four-way valve and absorbs the heat of the electric drive, so as to cool the electric drive through the electric drive circuit radiator; when the temperature of the electric drive is lower than the temperature of the battery, controlling all ports of the four-way valve to be turned on, controlling the first port and the third port of the third three-way valve on the battery cooling circuit to be turned on, and controlling the battery circuit radiator, the second fan, the third electronic water pump and the fourth electronic water pump on the battery cooling circuit to be turned on, so as to provide cooling energy for cooling the electric drive through the battery circuit radiator and the electric drive circuit radiator.

[0014] In a second aspect, the present application provides a thermal management control system for a vehicle, the system comprising: a battery; a power source, used to heat the battery using waste heat when the vehicle meets waste heat heating conditions; an evaporator, used to heat the battery when the vehicle meets start-up conditions; a battery circuit PTC, used to heat the battery when the vehicle does not meet the start-up conditions; a water heating electric heating WPTC, used to heat the battery when the vehicle does not meet the start-up conditions; a controller, configured to: identify whether the battery of the vehicle has a heating demand; if the battery has a heating demand, identify The working state of the power source of the vehicle is determined, and whether the vehicle meets the waste heat heating condition according to the identified working state; if the waste heat heating condition is met, the waste heat of the power source is used to heat the battery; if the waste heat heating condition is not met, whether the starting condition of the heat pump system of the vehicle is met is determined according to the ambient temperature of the vehicle; if the starting condition is met, the evaporator in the heat pump system is started to heat the battery; if the starting condition is not met, the battery circuit PTC and the water heating electric heating WPTC of the vehicle are started to heat the battery.

[0015] The present application provides a vehicle thermal management control method and thermal management control system, wherein the method includes: identifying whether the battery of the vehicle has a heating demand; if the battery has a heating demand, identifying the working state of the power source of the vehicle, and judging whether the vehicle meets the waste heat heating condition according to the identified working state; if the waste heat heating condition is met, using the waste heat of the power source to heat the battery; if the waste heat heating condition is not met, determining whether the start-up condition of the heat pump system of the vehicle is met according to the ambient temperature of the vehicle; if the start-up condition is met, starting the evaporator in the heat pump system to heat the battery; if the start-up condition is not met, starting the battery circuit PTC and water heating electric heating WPTC of the vehicle to heat the battery. Through the present application, the efficiency and utilization rate of waste heat recovery are improved, thereby achieving the goal of energy saving and emission reduction.

[0016] In order to make the above-mentioned objects, features and advantages of the present application more obvious and easy to understand, preferred embodiments are specifically cited below and described in detail with reference to the attached drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A flow chart of a thermal management control method for a vehicle provided in an embodiment of the present application;

[0019] Figure 2 A schematic diagram of the structure of a thermal management system using engine waste heat to heat a battery provided in an embodiment of the present application;

[0020] Figure 3 A schematic diagram of the structure of a thermal management system using waste heat from electric drive to heat the battery provided in an embodiment of the present application;

[0021] Figure 4 A schematic diagram of the structure of a thermal management system using an evaporator to heat a battery provided in an embodiment of the present application;

[0022] Figure 5 A schematic diagram of the structure of a thermal management system using a battery circuit PTC and a water heating electric heating WPTC to heat a battery provided in an embodiment of the present application;

[0023] Figure 6 A flow chart for heating a cabin provided by an embodiment of the present application;

[0024] Figure 7 A schematic diagram of the structure of a thermal management system for heating a passenger cabin using waste heat from an engine provided in an embodiment of the present application;

[0025] Figure 8 A schematic diagram of the structure of a thermal management system using an evaporator to heat a passenger cabin provided in an embodiment of the present application;

[0026] Fig. 9 A schematic diagram of the structure of a thermal management system using HVAC to cool a passenger cabin provided in an embodiment of the present application;

[0027] Fig.10 A flowchart for battery cooling provided by an embodiment of the present application;

[0028] Fig.11 A schematic diagram of the structure of a thermal management system using a battery circuit radiator to cool a battery provided in an embodiment of the present application;

[0029] Fig.12 A schematic diagram of the structure of a thermal management system using an electric drive circuit radiator to cool a battery provided in an embodiment of the present application;

[0030] Fig.13 A schematic diagram of the structure of a thermal management system using a battery cooler to cool a battery provided in an embodiment of the present application;

[0031] Fig.14 A flow chart for electrically driven refrigeration provided in an embodiment of the present application;

[0032] Fig.15 A schematic diagram of the structure of a thermal management system for cooling a battery using a battery circuit radiator and an electric drive circuit radiator provided in an embodiment of the present application.

[0033] Figure numerals: 101-first three-way valve; 102-second three-way valve; 103-third three-way valve; 104-fourth three-way valve; 105-four-way valve; 201-warm air stop valve; 202-heat pump four-way reversing valve; 203-thermal expansion valve; 204-passenger compartment cooling stop valve; 205-electronic expansion valve; 301-battery circuit PTC; 302-water heating electric heating WPTC; 303-wind heating electric heating PTC; 401-battery circuit radiator; 402-second fan; 403-evaporator; 404-first fan; 4 05-engine radiator; 406-fourth fan; 407-electric drive circuit radiator; 408-third fan; 501-battery; 502-electric drive; 503-engine; 504-plate heat exchanger; 506-HVAC; 601-third electronic water pump; 602-fourth electronic water pump; 603-fifth electronic water pump; 604-second electronic water pump; 701-pressure switch; 702-first expansion water tank; 703-second expansion water tank; 704-third expansion water tank; 801-condenser; 802-battery cooler. DETAILED DESCRIPTION

[0034] To make the purpose, technical scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application usually described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work belongs to the scope of protection of the present application.

[0035] First, the application scenarios to which the present application is applicable are introduced. The present application can be applied to automotive thermal management.

[0036] Research has found that current technology integrates multiple heat sources of hybrid vehicles and extended-range vehicles, utilizes the on-off regulation of the air heater PTC (Positive Temperature Coefficient) in the coolant circulation loop, and the precise management of the flow direction of the three-way valve and four-way valve to achieve the cooling of the electric drive system, as well as the cooling or heating functions of the passenger compartment and battery pack.

[0037] However, the current technology control logic is still simple and fails to fully cover all operating scenarios and working conditions of the vehicle, especially when facing complex requirements such as cabin heating and battery pack cooling. In addition, the heat exchange between different thermal cycle loops under the current technology framework is relatively limited, which hinders the efficient and optimal use of energy.

[0038] Based on this, the embodiment of the present application provides a vehicle thermal management control method and a thermal management control system. Based on the actual vehicle operation status, it considers the tiered utilization and on-demand allocation of heat, determines the priority of starting system components according to the priority of heat utilization, and formulates control strategies for related components to improve the efficiency and utilization rate of waste heat recovery, thereby achieving the goal of energy conservation and emission reduction.

[0039] See also Figure 1 , Figure 1 This is a flow chart of a vehicle thermal management control method provided by an embodiment of the present application. Figure 1 As shown in the figure, the thermal management control method of a vehicle provided by the embodiment of the present application includes:

[0040] S101 , identifying whether the battery 501 of the vehicle has a heating demand.

[0041] Here, the vehicle is a hybrid vehicle, and the heating demand refers to the heating demand generated when the temperature of the battery 501 is lower than a preset temperature. The temperature of the battery 501 is obtained by temperature sensors arranged at both ends of the battery 501.

[0042] S102: If the battery 501 has a heating demand, the working state of the power source of the vehicle is identified, and whether the vehicle meets the residual heat heating condition is determined according to the identified working state.

[0043] In a preferred example of the present application, the power source includes an engine 503 and an electric drive 502, and the waste heat heating condition includes a first waste heat heating condition and a second waste heat heating condition, wherein, when the working state of the engine 503 is the running state, it is determined that the vehicle meets the first waste heat heating condition, so as to use the waste heat of the engine 503 to heat the battery 501, and when the working state of the electric drive 502 is the running state, it is determined that the vehicle meets the second waste heat heating condition, so as to use the waste heat of the electric drive 502 to heat the battery 501.

[0044] S103 : If the waste heat heating condition is met, the waste heat of the power source is used to heat the battery 501 .

[0045] Below through Figure 2 The process of using the waste heat of the engine 503 to heat the battery 501 is introduced.

[0046] Figure 2Schematic diagram of the structure of a thermal management system for heating a battery 501 using waste heat from an engine 503 provided in an embodiment of the present application.

[0047] When the vehicle meets the first waste heat heating condition, the first and second ports of the first three-way valve 101 on the engine heating circuit are controlled to be connected, the first and second ports of the second three-way valve 102 on the engine heating circuit are controlled to be connected, and the warm air stop valve 201 on the engine heating circuit is controlled to be connected, so as to heat the engine heating circuit with the waste heat of the engine 503, so that the heat in the engine heating circuit enters the plate heat exchanger 504 arranged on the engine heating circuit through the second three-way valve 102 and the warm air stop valve 201. At the same time, the first and second ports of the four-way valve 105 on the battery heating circuit are controlled to be connected, and the first and second ports of the third three-way valve 103 on the battery heating circuit are controlled to be connected, so that the heat in the plate heat exchanger 504 provides heat to the battery 501 via the battery heating circuit, so as to heat the battery 501 with the waste heat of the engine 503.

[0048] Here, when using the engine's waste heat to heat the battery, adding a warm air shut-off valve to the engine heating circuit can not only achieve rapid warm-up, but also prevent the battery from being heated unnecessarily when a three-way valve fails.

[0049] S104: If the waste heat heating condition is not met, determine whether the start-up condition for starting the heat pump system of the vehicle is met according to the ambient temperature of the vehicle.

[0050] Below through Figure 3 The process of using the waste heat of the electric drive 502 to heat the battery 501 is introduced.

[0051] Figure 3 Schematic diagram of the structure of a thermal management system for heating a battery 501 using waste heat from an electric drive 502 provided in an embodiment of the present application.

[0052] The first and second ports of the third three-way valve 103 on the battery heating circuit are controlled to be connected, all ports of the four-way valve 105 on the battery heating circuit are controlled to be connected, and the first and second ports of the fourth three-way valve 104 on the electric drive 502 heating circuit are controlled to be connected, so as to heat the electric drive 502 heating circuit with the waste heat of the electric drive 502, so that the heat in the electric drive 502 heating circuit enters the plate heat exchanger 504 arranged on the engine heating circuit through the fourth three-way valve 104, the four-way valve 105 and the third three-way valve 103, so that the heat in the plate heat exchanger 504 provides heat to the battery 501 via the battery heating circuit, so as to heat the battery 501 with the waste heat of the electric drive 502.

[0053] S105 , if the start condition is met, start the evaporator 403 in the heat pump system to heat the battery 501 .

[0054] Below through Figure 4 The process of using the evaporator 403 to heat the battery 501 is described.

[0055] Figure 4 A schematic diagram of the structure of a thermal management system using an evaporator 403 to heat a battery 501 provided in an embodiment of the present application.

[0056] Specifically, the heat pump four-way reversing valve 202 and the electronic expansion valve 205 are controlled to be turned on, and the condenser 801 , the evaporator 403 , and the fourth fan 406 are controlled to be turned on, so as to heat the battery 501 through the evaporator 403 .

[0057] S106 , if the start condition is not met, the vehicle's battery circuit PTC 301 and water heater WPTC 302 are started to heat the battery 501 .

[0058] Below through Figure 5 The process of heating the battery 501 using the battery circuit PTC 301 and the water heating electric heating WPTC 302 is introduced.

[0059] Figure 5 This is a schematic diagram of the structure of a thermal management system that uses a battery circuit PTC 301 and a water-heating electric heater WPTC 302 to heat a battery 501, as provided in an embodiment of the present application.

[0060] The first and second ports of the four-way valve 105 on the battery heating circuit are controlled to be connected, the first and second ports of the third three-way valve 103 on the battery heating circuit are controlled to be connected, and the first electronic water pump and the battery circuit PTC301 on the battery heating circuit are controlled to be turned on, so that the heat provided by the battery circuit PTC301 flows through the battery 501 to heat the battery 501.

[0061] When receiving the instruction to turn on the water heating electric heater WPTC302, the water heating electric heater WPTC302 and the second electronic water pump 604 on the water heating electric heating circuit are controlled to be turned on, the first port and the second port of the first three-way valve 101 on the engine heating circuit are controlled to be turned on, the first port and the second port of the second three-way valve 102 are controlled to be turned on, and the warm air stop valve 201 is controlled to be turned on, so that the water heating electric heater WPTC302 and the battery circuit PTC301 can heat the battery 501 together.

[0062] Figure 6 A flow chart for heating a cabin provided in an embodiment of the present application.

[0063] S201. In response to a request for heating a passenger compartment of a vehicle, identifying an operating state of an engine 503 of the vehicle, and determining whether the vehicle satisfies a first residual heat heating condition according to the identified operating state.

[0064] S202: If the first waste heat heating condition is met, the waste heat of the engine 503 is used to heat the passenger compartment.

[0065] Among them, when the engine 503 is in working state, the first waste heat heating condition is met.

[0066] Figure 7 A schematic diagram of the structure of a thermal management system for heating a passenger cabin using waste heat from an engine 503 provided in an embodiment of the present application.

[0067] The heater shut-off valve 201 on the engine heating circuit is controlled to be turned on, the first and third ports of the first three-way valve 101 on the engine heating circuit are controlled to be turned on, and the first and second ports of the second three-way valve 102 on the engine heating circuit are controlled to be turned on, so as to heat the engine heating circuit with the waste heat of the engine 503, so that the heat in the engine heating circuit enters the HVAC506 cabin heater core arranged on the engine heating circuit through the second three-way valve 102 and the heater shut-off valve 201, so as to heat the passenger cabin with the waste heat of the engine 503.

[0068] S203: If the residual heat heating condition of the engine 503 is not met, determine whether the vehicle meets the start-up condition, and the start-up condition indicates that the ambient temperature of the vehicle is within a preset temperature range.

[0069] S204: If the start-up conditions are met, the cabin is heated via the evaporator 403.

[0070] Figure 8 A schematic diagram of the structure of a thermal management system for heating a passenger cabin using an evaporator 403 provided in an embodiment of the present application.

[0071] The heat pump four-way reversing valve 202 on the cabin heating circuit is controlled to be turned on, the evaporator 403 on the cabin heating circuit is controlled to start, the passenger compartment cooling stop valve 204 on the cabin heating circuit is controlled to be turned on, and the thermal expansion valve 203 on the cabin heating circuit is controlled to be turned on, so as to generate heat through the evaporator 403, so that the heat generated by the evaporator 403 enters the HVAC506 cabin heater core in the cabin heating circuit through the passenger compartment cooling stop valve 204 and the thermal expansion valve, so as to heat the cabin through the evaporator 403.

[0072] S205: If the start condition is not met, start the vehicle's air heating electric heating PTC 303 and the water heating electric heating WPTC 302 to heat the passenger compartment.

[0073] The thermal management control system of the present application is divided into two working modes: cooling and heating. The vehicle thermal management system includes a refrigerant circulation loop and a coolant circulation loop. The refrigerant circulation loop can provide cooling for the passenger cabin and the battery in the heat pump cooling mode, and can also heat the passenger cabin and the battery in the heat pump heating mode. Among them, the evaporator in the HVAC506 cabin provides cooling for the passenger cabin, and the battery cooler 802 provides cooling for the battery coolant. The flow rate of the refrigerant in the loop is allocated according to the cooling requirements of the passenger cabin and the battery. If the total refrigerant flow rate in the loop is Q, the refrigerant flow rate flowing through the evaporator is Q1, and the refrigerant flow rate flowing through the battery cooler 802 is Q2, then Q=Q1+Q2, and Q1 depends on the opening of the thermal expansion valve 203, and Q2 depends on the opening of the electronic expansion valve 205. When the temperature is high in summer and the cooling demand for the cabin and the battery is high, the evaporation temperature of the cabin evaporator is low and the corresponding evaporation pressure is also low. If the evaporation temperature of the cabin evaporator is much lower than that of the battery cooler 802 and the opening of the thermal expansion valve 203 is not controlled, there will be a problem of refrigerant flow distribution in the two branches. Even if the electronic expansion valve is opened to the maximum, the refrigerant flow of the battery cooler 802 circuit is still much smaller than that of the cabin cooling circuit.

[0074] In a preferred example of the present application, HVAC 506 may also be used to cool the passenger cabin.

[0075] Fig. 9 A schematic diagram of the structure of a thermal management system using HVAC506 to cool a passenger cabin provided in an embodiment of the present application.

[0076] In response to the cooling demand for the vehicle's passenger cabin, the HVAC506 cabin evaporator 403, the first fan 404, the compressor and the condenser 801 on the passenger cabin refrigeration circuit are controlled to be turned on, and the heat pump four-way reversing valve 202, the passenger cabin refrigeration stop valve 204 and the thermal expansion valve 203 on the passenger cabin refrigeration circuit are controlled to be turned on, so that the refrigerant is compressed and condensed through the heat pump four-way reversing valve 202, the compressor and the condenser 801 to obtain liquid refrigerant, so that the liquid refrigerant enters the HVAC506 cabin evaporator 403 after being regulated by the thermal expansion valve, and the air that has been cooled in the HVAC506 cabin evaporator 403 is blown into the passenger cabin through the first fan 404 to provide cooling for the passenger cabin.

[0077] If the battery temperature is high at this time, the passenger compartment refrigeration shut-off valve 204 is controlled to be closed, temporarily cutting off the cabin refrigeration circuit to meet the battery cooling needs, prevent the battery from overheating, and meet functional safety.

[0078] In a preferred embodiment of the present application, Fig.10 A flow chart of cooling the battery 501 provided in an embodiment of the present application.

[0079] S301, identifying whether the battery 501 has a cooling demand;

[0080] S302 , if the battery 501 has a cooling demand, the battery 501 is cooled by the battery circuit radiator 401 .

[0081] Fig.11 Schematic diagram of the thermal management system structure for cooling a battery 501 using a battery circuit radiator 401 provided in an embodiment of the present application.

[0082] Controlling the first and second ports of the four-way valve 105 on the battery cooling circuit to be connected, controlling the first and third ports of the third three-way valve 103 on the battery cooling circuit to be connected, and controlling the battery circuit radiator 401, the second fan 402, the third electronic water pump 601, and the fourth electronic water pump 602 on the battery 501 cooling circuit to be turned on, so as to provide cooling through the battery circuit radiator 401, so that the cooling energy flows through the battery 501 through the driving of the third electronic water pump 601 and the fourth electronic water pump 602 and absorbs the heat of the battery 501, so as to cool the battery 501 through the battery circuit radiator 401;

[0083] S303 , when the temperature of the electric drive 502 is lower than the temperature of the battery 501 , the battery 501 is cooled by the electric drive circuit radiator 407 .

[0084] Fig.12 Schematic diagram of the thermal management system structure for cooling the battery 501 using the electric drive circuit radiator 407 provided in an embodiment of the present application.

[0085] Control the third port of the third three-way valve 103 to be closed, and control the battery circuit radiator 401 and the third electronic water pump 601 to be closed, and control all ports of the four-way valve 105 to be turned on, control the second port of the third three-way valve 103 to be turned on, control the electric drive circuit radiator 407, the third fan 408 and the fifth electronic water pump 603 of the electric drive cooling circuit to be turned on, and control the first port and the second port of the fourth three-way valve 104 to be turned on, so as to provide cooling through the electric drive circuit radiator 407, so that the cooling energy flows through the four-way valve 105, the third three-way valve 103, and the fourth electronic water pump 602 on the electric drive cooling circuit through the drive of the fifth electronic water pump 603, flows through the battery 501 and absorbs the heat of the battery 501, so as to cool the battery 501 through the electric drive circuit radiator 407;

[0086] S304 , when both the battery circuit radiator 401 and the electric drive circuit radiator 407 cannot meet the cooling demand of the battery 501 , the battery 501 is cooled by the battery cooler 802 .

[0087] Fig.13A schematic diagram of the structure of a thermal management system using a battery cooler 802 to cool a battery 501 provided in an embodiment of the present application.

[0088] The third and fourth ports of the four-way valve 105 are controlled to be closed, the fourth three-way valve 104 is controlled to be closed, the electric drive circuit radiator 407 and the third fan 408 are controlled to be closed, the fifth electronic water pump 603 and the fourth three-way valve 104 are controlled to be closed, and the heat pump four-way reversing valve 202 and the electronic expansion valve 205 on the cabin cooling circuit are controlled to be turned on, the compressor, the battery cooler 802 and the first electronic water pump on the battery heating circuit are controlled to be turned on, the first and second ports of the four-way valve 105 are controlled to be turned on, and the first and second ports of the third three-way valve 103 are controlled to be turned on, so as to cool the battery 501 through the battery cooler 802.

[0089] Also includes: Fig.14 A flow chart of providing cooling for the electric drive 502 according to an embodiment of the present application.

[0090] S401 , identifying whether the electric drive 502 of the vehicle has a cooling demand.

[0091] S402 , if the electric drive 502 has a cooling demand, the electric drive 502 is cooled by the electric drive circuit radiator 407 .

[0092] Control the electric drive circuit radiator 407, the third fan 408 and the fifth electronic water pump 603 of the electric drive cooling circuit to turn on, and control the fourth three-way valve 104 to be turned on, so as to provide cooling through the electric drive circuit radiator 407, so that the cooling energy flows through the electric drive 502 via the fifth electronic water pump 603 and the four-way valve 105 and absorbs the heat of the electric drive 502, so as to cool the electric drive 502 through the electric drive circuit radiator 407;

[0093] S403 , when the temperature of the electric drive 502 is lower than the temperature of the battery 501 , the battery circuit radiator 401 and the electric drive circuit radiator 407 jointly provide cooling capacity for cooling the electric drive 502 .

[0094] Fig.15 Schematic diagram of the thermal management system structure for cooling the battery 501 using the battery circuit radiator 401 and the electric drive circuit radiator 407 provided in an embodiment of the present application.

[0095] Control all ports of the four-way valve 105 to be open, control the first and third ports of the third three-way valve 103 on the battery cooling circuit to be open, and control the battery circuit radiator 401, the second fan 402, the third electronic water pump 601 and the fourth electronic water pump 602 to be turned on, so as to provide cooling capacity for the electric drive 502 through the battery circuit radiator 401 and the electric drive circuit radiator 407.

[0096] In a possible embodiment of the present application, if the engine 503 has a cooling demand, the engine radiator 405 is started to cool the engine.

[0097] The pressure switch 701 can be used to automatically adjust the pressure in the system to maintain stable operation of the system. The first expansion water tank 702, the second expansion water tank 703 and the third expansion water tank 704 are used to cope with water volume expansion and pressure fluctuations caused by temperature changes in the thermal management control system, and can avoid water pipe rupture or equipment damage caused by water volume expansion.

[0098] Compared with other technologies, the present application is that the software architecture comprehensively considers various operating conditions and usage scenarios of the vehicle, formulates relevant control strategies according to the priority of energy utilization, and then determines the priority of starting system components; based on the needs of the whole vehicle, the software functions are selectively turned on or off through calibration, thereby improving the applicability of the software architecture.

[0099] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0100] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some communication interfaces, and the indirect coupling or communication connection of devices or units can be electrical, mechanical or other forms.

[0101] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0102] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0103] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially be embodied in the form of a software product, or in other words, the part that contributes to the prior art or the part of the technical solution. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0104] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The protection scope of the present application is not limited thereto. Although the present application is described in detail with reference to the above-mentioned embodiments, ordinary technicians in the field should understand that any technician familiar with the technical field can still modify the technical solutions recorded in the above-mentioned embodiments within the technical scope disclosed in the present application, or can easily think of changes, or make equivalent replacements for some of the technical features therein; and these modifications, changes or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A thermal management control method for a vehicle, characterized in that: The method comprises: Identifying whether the battery of the vehicle needs to be heated; If the battery has a heating demand, identifying the working state of the power source of the vehicle, and judging whether the vehicle meets the waste heat heating condition according to the identified working state; If the waste heat heating condition is met, using the waste heat of the power source to heat the battery; If the waste heat heating condition is not met, determining whether a start-up condition for starting a heat pump system of the vehicle is met according to the ambient temperature of the vehicle; If the start condition is met, starting the evaporator in the heat pump system to heat the battery; If the start condition is not met, the battery circuit PTC and water heater WPTC of the vehicle are started to heat the battery.

2. The method according to claim 1, characterized in that The power source includes an engine and an electric drive, the waste heat heating condition includes a first waste heat heating condition and a second waste heat heating condition, Among them, it also includes: When the working state of the engine is the running state, determining that the vehicle meets the first waste heat heating condition, so as to use the waste heat of the engine to heat the battery; When the working state of the electric drive is the running state, it is determined that the vehicle meets the second waste heat heating condition, so as to use the waste heat of the electric drive to heat the battery.

3. The method according to claim 2, characterized in that The waste heat of the engine is used to heat the battery by: When the vehicle meets the first waste heat heating condition, the first and second ports of the first three-way valve on the engine heating circuit are controlled to be connected, the first and second ports of the second three-way valve on the engine heating circuit are controlled to be connected, and the warm air stop valve on the engine heating circuit is controlled to be connected, so as to heat the engine heating circuit with the waste heat of the engine, so that the heat in the engine heating circuit enters the plate heat exchanger arranged on the engine heating circuit via the second three-way valve and the warm air stop valve. At the same time, the first and second ports of the four-way valve on the battery heating circuit are controlled to be connected, and the first and second ports of the third three-way valve on the battery heating circuit are controlled to be connected, so that the heat in the plate heat exchanger provides heat to the battery via the battery heating circuit, so as to heat the battery with the waste heat of the engine.

4. The method according to claim 2, characterized in that: The waste heat of the electric drive is used to heat the battery in the following manner: The first and second ports of the third three-way valve on the battery heating circuit are controlled to be connected, all ports on the four-way valve on the battery heating circuit are controlled to be connected, and the first and second ports of the fourth three-way valve on the electric drive heating circuit are controlled to be connected, so as to heat the electric drive heating circuit with the waste heat of the electric drive, so that the heat in the electric drive heating circuit enters the plate heat exchanger arranged on the engine heating circuit through the fourth three-way valve, the four-way valve and the third three-way valve, so that the heat in the plate heat exchanger provides heat to the battery through the battery heating circuit, so as to heat the battery with the waste heat of the electric drive.

5. The method according to claim 2, characterized in that: Also includes: In response to a request for heating a passenger compartment of the vehicle, identifying an operating state of an engine of the vehicle, and determining whether the vehicle satisfies the first waste heat heating condition according to the identified operating state; If the first waste heat heating condition is met, the heater cut-off valve on the engine heating circuit is controlled to be turned on, the first port and the third port of the first three-way valve on the engine heating circuit are controlled to be turned on, and the first port and the second port of the second three-way valve on the engine heating circuit are controlled to be turned on, so as to heat the engine heating circuit with the waste heat of the engine, so that the heat in the engine heating circuit enters the HVAC cabin heater core disposed on the engine heating circuit through the second three-way valve and the heater cut-off valve, so as to heat the passenger cabin with the waste heat of the engine; If the engine waste heat heating condition is not met, determining whether the vehicle meets the start-up condition, the start-up condition indicating that the ambient temperature of the vehicle is within a preset temperature range; If the start condition is met, the heat pump four-way reversing valve on the cabin heating circuit is controlled to be turned on, the evaporator on the cabin heating circuit is controlled to be started, the passenger compartment cooling stop valve on the cabin heating circuit is controlled to be turned on, and the thermal expansion valve on the cabin heating circuit is controlled to be turned on, so as to heat the cabin through the evaporator, so that the heat generated by the evaporator enters the HVAC cabin heater core in the cabin heating circuit through the passenger compartment cooling stop valve and the thermal expansion valve, so as to heat the cabin through the evaporator; If the start condition is not met, the vehicle's air-heating electric heating PTC and the water-heating electric heating WPTC are started to heat the passenger compartment.

6. The method according to claim 1, characterized in that The steps of starting the battery circuit PTC and the water heating electric heating WPTC of the vehicle to heat the battery include: Controlling the first and second ports of the four-way valve on the battery heating circuit to be connected, controlling the first and second ports of the third three-way valve on the battery heating circuit to be connected, and controlling the first electronic water pump on the battery heating circuit and the battery circuit PTC to be turned on, so that the heat provided by the battery circuit PTC flows through the battery to heat the battery; When receiving an instruction to turn on the water-heating electric heating WPTC, the water-heating electric heating WPTC and the second electronic water pump on the water-heating electric heating circuit are controlled to be turned on, the first port and the second port of the first three-way valve on the engine heating circuit are controlled to be connected, the first port and the second port of the second three-way valve are controlled to be connected, and the warm air shut-off valve is controlled to be turned on, so that the water-heating electric heating WPTC and the battery circuit PTC can heat the battery together.

7. The method according to claim 1, characterized in that Also includes: In response to the cooling demand for the passenger cabin of the vehicle, the HVAC cabin evaporator, the first fan, the compressor and the condenser on the passenger cabin cooling circuit are controlled to be turned on, and the heat pump four-way reversing valve, the passenger cabin refrigeration stop valve and the thermal expansion valve on the passenger cabin cooling circuit are controlled to be turned on, so that the refrigerant is compressed and condensed by the heat pump four-way reversing valve, the compressor and the condenser to obtain liquid refrigerant, so that the liquid refrigerant enters the HVAC cabin evaporator after being regulated by the thermal expansion valve, and the air cooled in the HVAC cabin evaporator is blown into the passenger cabin by the first fan 3 to provide cooling for the passenger cabin.

8. The method according to claim 1, characterized in that Also includes: Identifying whether the battery requires cooling; If the battery has a cooling demand, the first port and the second port of the four-way valve on the battery cooling circuit are controlled to be connected, the first port and the third port of the third three-way valve on the battery cooling circuit are controlled to be connected, and the battery circuit radiator, the second fan, the third electronic water pump and the fourth electronic water pump on the battery cooling circuit are controlled to be turned on to provide cooling through the battery circuit radiator, so that the cooling energy flows through the battery through the driving of the third electronic water pump and the fourth electronic water pump and absorbs the heat of the battery, so as to cool the battery through the battery circuit radiator; When the temperature of the electric drive is lower than the temperature of the battery, the third port of the third three-way valve is controlled to be closed, and the battery circuit radiator and the third electronic water pump are controlled to be closed, and all ports of the four-way valve are controlled to be connected, the second port of the third three-way valve is controlled to be connected, the electric drive circuit radiator, the third fan and the fifth electronic water pump of the electric drive cooling circuit are controlled to be turned on, and the first port and the second port of the fourth three-way valve are controlled to be connected, so as to provide cold energy through the electric drive circuit radiator, so that the cold energy flows through the four-way valve, the third three-way valve and the fourth electronic water pump on the electric drive cooling circuit through the driving of the fifth electronic water pump, flows through the battery and absorbs the heat of the battery, so as to cool the battery through the electric drive circuit radiator; When neither the battery circuit radiator nor the electric drive circuit radiator can meet the cooling demand of the battery, the third and fourth ports of the four-way valve are controlled to be closed, the fourth three-way valve is controlled to be closed, the electric drive circuit radiator and the third fan are controlled to be closed, the fifth electronic water pump and the fourth three-way valve are controlled to be closed, and the heat pump four-way reversing valve and the electronic expansion valve on the cabin cooling circuit are controlled to be turned on, the compressor, the battery cooler and the first electronic water pump on the battery cooling circuit are controlled to be turned on, the first and second ports of the four-way valve are controlled to be turned on, and the first and second ports of the third three-way valve are controlled to be turned on, so as to cool the battery through the battery cooler.

9. The method according to claim 1, characterized in that: Also includes: Identifying whether an electric drive of the vehicle has a cooling demand; If the electric drive has a cooling demand, the electric drive circuit radiator, the third fan and the fifth electronic water pump of the electric drive cooling circuit are controlled to be turned on, and the fourth three-way valve is controlled to be turned on, so as to provide cooling through the electric drive circuit radiator, so that the cooling energy flows through the electric drive via the fifth electronic water pump and the four-way valve on the electric drive cooling circuit and absorbs the heat of the electric drive, so as to cool the electric drive through the electric drive circuit radiator; When the temperature of the electric drive is lower than the temperature of the battery, all ports of the four-way valve are controlled to be open, the first port and the third port of the third three-way valve on the battery cooling circuit are controlled to be open, and the battery circuit radiator, the second fan, the third electronic water pump and the fourth electronic water pump on the battery cooling circuit are controlled to be turned on, so that the battery circuit radiator and the electric drive circuit radiator can jointly provide cold energy for cooling the electric drive.

10. A thermal management control system for a vehicle, characterized in that: The system comprises: Battery; A power source, used to use waste heat to heat the battery when the vehicle meets waste heat heating conditions; an evaporator, used to heat the battery when the vehicle meets the starting conditions; A battery circuit PTC, used to heat the battery when the vehicle does not meet the starting conditions; Water-heating electric heating WPTC, used to heat the battery when the vehicle does not meet the starting conditions; The controller is configured to: identify whether the battery of the vehicle has a heating demand; if the battery has a heating demand, identify the working state of the power source of the vehicle, and determine whether the vehicle meets the waste heat heating condition based on the identified working state; if the waste heat heating condition is met, use the waste heat of the power source to heat the battery; if the waste heat heating condition is not met, determine whether the start-up condition of the heat pump system of the vehicle is met based on the ambient temperature of the vehicle; if the start-up condition is met, start the evaporator in the heat pump system to heat the battery; if the start-up condition is not met, start the battery circuit PTC and water heating electric heating WPTC of the vehicle to heat the battery.

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