Vehicle thermal management method, device, equipment and storage medium

Abstract

The present invention relates to the field of vehicle control technology, and in particular to a vehicle thermal management method, device, equipment and storage medium. The present invention determines the heat recovery mode of the vehicle according to the vehicle state parameters, battery state parameters and electric drive circuit parameters of the target vehicle, thereby adapting to different environments. Under different environments, the operating state of each component in the thermal management device in the vehicle is controlled according to the heat recovery mode and control strategy corresponding to the environment, thereby avoiding the technical problem of low vehicle kinetic energy recovery efficiency under extreme environments in the prior art.

Description

Technical Field

[0001] The present invention relates to the field of vehicle control technology, and in particular to a vehicle thermal management method, device, equipment and storage medium. Background Art

[0002] At present, most new energy vehicles are equipped with a power recovery system. When the vehicle is coasting or braking, the system converts kinetic energy into electrical energy and stores it in the power battery. This energy can be reused for normal driving of the vehicle, greatly reducing the energy consumption and mileage anxiety of electric vehicles. However, when the battery is at low temperature and high SOC, the vehicle's energy recovery capacity is very low. When the vehicle is coasting or braking, the recovery capacity is weakened, and the recovered energy can only be consumed in the friction torque of the brake disc, resulting in a large amount of recovered energy waste.

[0003] The above contents are only used to assist in understanding the technical solution of the present invention and do not constitute an admission that the above contents are prior art. Summary of the invention

[0004] The main purpose of the present invention is to provide a vehicle thermal management method, device, equipment and storage medium, aiming to solve the technical problem of low vehicle kinetic energy recovery efficiency under extreme environments in the prior art.

[0005] To achieve the above-mentioned object, the present invention provides a vehicle thermal management method, which is applied to a thermal management device, wherein the thermal management device comprises: an electric drive cooling circuit, a battery cooling circuit, a warm air cooling circuit and a refrigerant circuit, wherein the electric drive cooling circuit comprises a first water pump, an electromagnetic three-way valve, a four-way valve and an electric drive circuit heat exchanger, wherein the electric drive cooling circuit is connected to the refrigerant circuit via the electric drive circuit heat exchanger, wherein the electric drive cooling circuit is connected to the battery cooling circuit via the four-way valve, wherein the electromagnetic three-way valve is used to adjust the water flow direction of the electric drive cooling circuit, wherein the refrigerant circuit comprises a water-cooled heat exchanger, wherein the refrigerant circuit is connected to the warm air cooling circuit via the water-cooled heat exchanger, wherein the battery cooling circuit comprises a second water pump and a battery, wherein the second water pump is used to control the water flow in the battery cooling circuit to heat the battery;

[0006] The method comprises the following steps:

[0007] Obtain vehicle status parameters, battery status parameters, and electric drive circuit parameters of the target vehicle;

[0008] Determining a heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter, and the electric drive circuit parameter;

[0009] The operating state of the thermal management device is controlled according to the control strategy corresponding to the heat recovery mode.

[0010] Optionally, determining the heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter and the electric drive circuit parameter includes:

[0011] generating a battery recycling ratio according to the battery status parameter and the vehicle status parameter;

[0012] When the battery recovery ratio is less than a preset ratio threshold, determining that the battery of the target vehicle is in a low recovery state;

[0013] Controlling the electric drive circuit to operate in a low recovery state;

[0014] The heat recovery mode of the vehicle is determined according to the ratio interval of the battery recovery ratio.

[0015] Optionally, determining the heat recovery mode of the vehicle according to the ratio interval of the battery recovery ratio includes:

[0016] When the battery recovery ratio is in a first efficiency range, determining that the vehicle is operated in a first heat recovery mode;

[0017] When the battery recovery ratio is in a second efficiency range, determining that the vehicle is operated in a second heat recovery mode, and a minimum value of the second efficiency range is greater than a maximum value of the first efficiency range;

[0018] When the battery recovery ratio is in a third efficiency range, it is determined that the vehicle is running in a third heat recovery mode, and a minimum value of the third efficiency range is greater than a maximum value of the second efficiency range.

[0019] Optionally, the vehicle status parameters include vehicle speed, accelerator pedal opening, brake pedal opening and motor speed, and the battery status parameters include battery health status and battery cell temperature;

[0020] The generating a battery recycling ratio according to the battery status parameter and the vehicle status parameter comprises:

[0021] Calculating battery recovery power according to the battery health status and battery cell temperature;

[0022] Calculating the vehicle recovery torque according to the vehicle speed, the accelerator pedal opening and the brake pedal opening;

[0023] Calculating vehicle recovery power according to the vehicle recovery torque and the motor speed;

[0024] A battery recovery ratio is generated according to the battery recovery power and the vehicle recovery power.

[0025] Optionally, the electric drive circuit parameter includes a coolant temperature in the electric drive circuit;

[0026] The determining of the heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter and the electric drive circuit parameter further includes:

[0027] When there is a heating demand in the vehicle air conditioning system and the coolant temperature is greater than a first temperature threshold, driving the vehicle to operate in a second heat recovery mode;

[0028] When there is no heating demand in the vehicle air conditioning system, determining a temperature difference between the coolant temperature and the battery core temperature;

[0029] When the temperature difference is greater than a second temperature threshold and the battery cell temperature is less than a rated heating temperature of the battery, the vehicle is driven to operate in a third heat recovery mode.

[0030] Optionally, controlling the operating state of the thermal management device according to the control strategy corresponding to the heat recovery mode includes:

[0031] adjusting the connection state between the electromagnetic three-way valve and the four-way valve according to the control strategy corresponding to the heat recovery mode; and / or

[0032] The operating state of the first water pump and / or the second water pump is adjusted according to the control strategy corresponding to the heat recovery mode.

[0033] Optionally, the vehicle thermal management method further includes:

[0034] When the heat recovery mode is the first heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve are connected, the first selection end of the four-way valve and the second selection end of the four-way valve are connected, the third selection end of the four-way valve and the fourth selection end of the four-way valve are connected, and the first water pump is controlled to run at a first speed;

[0035] When the heat recovery mode is the second heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve, the first selection end of the four-way valve and the second selection end of the four-way valve are connected, the third selection end of the four-way valve and the fourth selection end of the four-way valve are connected, the first water pump is controlled to operate at a first speed, and the air conditioning circuit is controlled to operate in an electric drive heat absorption mode;

[0036] When the heat recovery mode is the third heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve, the first selection end of the four-way valve and the fourth selection end of the four-way valve, the third selection end of the four-way valve and the second selection end of the four-way valve are connected, the first water pump is controlled to operate at a second speed, the second water pump is controlled to operate at a third speed, and the air-conditioning circuit is controlled to operate in a battery heat absorption mode, the first speed is less than the third speed, and the third speed is less than the second speed.

[0037] In addition, to achieve the above-mentioned purpose, the present invention further proposes a vehicle thermal management device, which is applied to a thermal management device, and the thermal management device includes: an electric drive cooling circuit, a battery cooling circuit, a warm air cooling circuit and a refrigerant circuit, the electric drive cooling circuit includes a first water pump, an electromagnetic three-way valve, a four-way valve and an electric drive circuit heat exchanger, the electric drive cooling circuit is connected to the refrigerant circuit through the electric drive circuit heat exchanger, the electric drive cooling circuit is connected to the battery cooling circuit through the four-way valve, the electromagnetic three-way valve is used to adjust the water flow direction of the electric drive cooling circuit, the refrigerant circuit includes a water-cooled heat exchanger, the refrigerant circuit is connected to the warm air cooling circuit through the water-cooled heat exchanger, the battery cooling circuit includes a second water pump and a battery, and the second water pump is used to control the flow of water in the battery cooling circuit to heat the battery;

[0038] The vehicle thermal management device comprises:

[0039] An acquisition module, used to acquire vehicle state parameters, battery state parameters and electric drive circuit parameters of the target vehicle;

[0040] a determination module, configured to determine a heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter, and the electric drive circuit parameter;

[0041] A control module is used to control the operating state of the thermal management device according to a control strategy corresponding to the heat recovery mode.

[0042] In addition, to achieve the above-mentioned objectives, the present invention also proposes a vehicle thermal management device, which includes: a memory, a processor, and a vehicle thermal management program stored in the memory and executable on the processor, wherein the vehicle thermal management program is configured to implement the steps of the vehicle thermal management method described above.

[0043] In addition, to achieve the above-mentioned purpose, the present invention also proposes a storage medium, on which a vehicle thermal management program is stored, and when the vehicle thermal management program is executed by a processor, the steps of the vehicle thermal management method described above are implemented.

[0044] The present invention discloses a vehicle thermal management method, which includes: obtaining vehicle state parameters, battery state parameters and electric drive circuit parameters of a target vehicle; determining a heat recovery mode of the vehicle according to at least one of the vehicle state parameters, battery state parameters and electric drive circuit parameters; and controlling the operating state of the thermal management device according to a control strategy corresponding to the heat recovery mode. Compared with the prior art, the present invention adapts to different environments by determining the heat recovery mode of the vehicle according to the vehicle state parameters, battery state parameters and electric drive circuit parameters of the target vehicle, and controls the operating state of each component in the thermal management device in the vehicle according to the heat recovery mode and control strategy corresponding to the environment under different environments, thereby avoiding the technical problem of low vehicle kinetic energy recovery efficiency under extreme environments in the prior art. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] Figure 1 It is a structural schematic diagram of a vehicle thermal management device in a hardware operating environment involved in an embodiment of the present invention;

[0046] Figure 2 It is a schematic flow chart of a first embodiment of a vehicle thermal management method of the present invention;

[0047] Figure 3 A schematic diagram of a mapping between battery recharge power and battery cell temperature according to an embodiment of a vehicle thermal management method of the present invention;

[0048] Figure 4 A schematic diagram of a thermal management device according to an embodiment of a vehicle thermal management method of the present invention;

[0049] Figure 5 A schematic diagram of the interaction of a thermal management control device according to an embodiment of a vehicle thermal management method of the present invention;

[0050] Figure 6 A schematic diagram of a flow chart of a second embodiment of a vehicle thermal management method according to the present invention;

[0051] Figure 7 A schematic diagram of preset torque-efficiency of an embodiment of a vehicle thermal management method of the present invention;

[0052] Figure 8 A schematic diagram of a thermal management process of a vehicle thermal management method according to an embodiment of the present invention;

[0053] Fig. 9 This is a structural block diagram of the first embodiment of the vehicle thermal management device of the present invention.

[0054] Description of reference numerals:

[0055]

[0056] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0057] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0058] Reference Figure 1 , Figure 1 A schematic diagram of the structure of a vehicle thermal management device in the hardware operating environment involved in an embodiment of the present invention.

[0059] like Figure 1 As shown, the vehicle thermal management device may include: a processor 1001, such as a central processing unit (CPU), a communication bus 1002, a user interface 1003, a network interface 1004, and a memory 1005. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a wireless fidelity (Wireless-Fidelity, Wi-Fi) interface). The memory 1005 may be a high-speed random access memory (Random Access Memory, RAM), or a stable non-volatile memory (Non-Volatile Memory, NVM), such as a disk storage. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0060] Those skilled in the art will understand that Figure 1 The structure shown in the figure does not constitute a limitation on the vehicle thermal management device, and may include more or less components than shown in the figure, or combine certain components, or arrange the components differently.

[0061] like Figure 1 As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a vehicle thermal management program.

[0062] exist Figure 1In the vehicle thermal management device shown, the network interface 1004 is mainly used for data communication with the network server; the user interface 1003 is mainly used for data interaction with the user; the processor 1001 and the memory 1005 in the vehicle thermal management device of the present invention can be set in the vehicle thermal management device, and the vehicle thermal management device calls the vehicle thermal management program stored in the memory 1005 through the processor 1001, and executes the vehicle thermal management method provided by the embodiment of the present invention.

[0063] The embodiment of the present invention provides a vehicle thermal management method, referring to Figure 2 , Figure 2 It is a schematic flow chart of a first embodiment of a vehicle thermal management method of the present invention.

[0064] In this embodiment, the vehicle thermal management method includes the following steps:

[0065] Step S10: Obtain vehicle state parameters, battery state parameters, and electric drive circuit parameters of the target vehicle.

[0066] It should be noted that the executor of the method of this embodiment can be a device with functions such as data processing, data collection and program running, such as: an on-board computer and / or a controller inside the vehicle, etc., or other devices that can achieve the same or similar functions. This embodiment does not impose specific restrictions on this. In this embodiment and the following embodiments, the controller inside the vehicle will be used as an example for explanation.

[0067] It is worth noting that the basic principle of the power recovery system is that during coasting or braking, the vehicle controller requests the motor to output negative torque to achieve vehicle energy recovery. The energy recovery intensity is limited by the battery's allowable charging power. The battery's recharging power is generally related to the SOC and the battery cell temperature, such as Figure 3 As shown, when the battery is at low temperature and high SOC, the vehicle's energy recovery ability is very low. When the vehicle is coasting or braking, the recovery ability is weakened and a large amount of energy can only be consumed in the friction torque of the brake disc.

[0068] To solve the above problems, refer to Figure 4, this embodiment proposes a thermal management device arranged in a vehicle, including: an electric drive cooling circuit, a battery cooling circuit, a warm air cooling circuit and a refrigerant circuit, the electric drive cooling circuit includes a kettle 1, a first water pump 2, an AC / DC converter 3, a rear electric drive 4, a front electric drive 5, an electromagnetic three-way valve 6, a radiator 7, an electric drive circuit heat exchanger 8 and a four-way valve 9; the battery coolant circuit includes a water pump 11, a battery 10 and a four-way valve 9; the warm air coolant circuit includes a water pump 18, a water-cooled condenser 13, an electric heater 16 and a warm air core 17; the refrigerant circuit includes a compressor 12, a water-cooled condenser 13, an electronic expansion valve 14, an external heat exchanger 15 and an electric drive circuit heat exchanger 8.

[0069] In a specific implementation, the battery recharging power is generally related to the SOC and the battery cell temperature. In extreme environments, in order to increase the battery recharging power, the present embodiment can increase the battery cell temperature so that the battery cell temperature is in a more appropriate range. When adjusting the battery cell temperature, the operation of the compressor of the refrigerant circuit can allow the high-temperature and high-pressure refrigerant to exchange heat with the electric drive coolant circuit through the electric drive circuit heat exchanger 8, and then through the battery coolant circuit, the battery cell temperature is increased to improve the energy recovery efficiency.

[0070] In addition, the high-temperature and high-pressure refrigerant can also undergo heat exchange through the water-cooled condenser 13 in the warm air coolant circuit, thereby transferring excess heat to the interior of the vehicle for heating or cooling, adjusting the temperature inside the cabin, and improving energy recovery efficiency and user experience.

[0071] The thermal management control device in this embodiment also includes a vehicle controller VCU, a battery management system BMS, an electric drive controller MCU, an air conditioning system AC, and a thermal management system execution end. The interaction relationship between each system is referenced Figure 5 .

[0072] In addition, the temperature of the vehicle's electric drive can also be controlled through the electric drive circuit heat exchanger 8 in the electric drive coolant circuit, so as to warm up the vehicle and reduce vehicle energy consumption when the temperature is low in winter. In this scenario, when the first selection end and the second selection end of the three-way valve are connected, the refrigerant can reduce the coolant temperature in the electric drive circuit through the external heat exchanger, thereby controlling the temperature of the entire vehicle's electric drive. If the second selection end and the third selection end of the electromagnetic three-way valve are connected, the entire electric drive circuit can be kept at a suitable temperature to maintain the vehicle's operating stability.

[0073] It can be understood that the vehicle status parameters include but are not limited to vehicle speed, accelerator pedal opening, brake pedal opening and motor speed; the battery status parameters include but are not limited to battery health status and battery cell temperature; the electric drive circuit parameters include the coolant temperature in the electric drive circuit.

[0074] Step S20: Determine the heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter and the electric drive circuit parameter.

[0075] It should be noted that the vehicle in this embodiment has three heat recovery modes, namely the first heat recovery mode, the second heat recovery mode and the third heat recovery mode. The first heat recovery mode mainly recovers excess heat through the electric drive cooling circuit; the second heat recovery mode mainly recovers excess heat through the air-conditioning system for heating the cabin; the third heat recovery mode mainly recovers excess heat through the battery.

[0076] Step S30: controlling the operating state of the thermal management device according to the control strategy corresponding to the heat recovery mode.

[0077] It is understandable that different control modes correspond to different control strategies to achieve different heat recovery effects, wherein the operating state of the thermal management device is controlled mainly by the connectivity state of the electromagnetic three-way valve, the connectivity state of the four-way valve, the adjustment of the operating state of the first water pump, and at least one of the operating state of the second water pump. This embodiment does not impose specific restrictions on this.

[0078] This embodiment determines the heat recovery mode of the vehicle according to the vehicle state parameters, battery state parameters and electric drive circuit parameters of the target vehicle, thereby adapting to different environments. In different environments, the operating state of each component in the thermal management device in the vehicle is controlled according to the heat recovery mode and control strategy corresponding to the environment, thereby avoiding the technical problem of low vehicle kinetic energy recovery efficiency in extreme environments in the prior art.

[0079] refer to Figure 6 , Figure 6 It is a flow chart of a second embodiment of a vehicle thermal management method of the present invention.

[0080] Based on the above first embodiment, in this embodiment, step S20 includes:

[0081] Step S201: Generate a battery recycling ratio according to the battery status parameter and the vehicle status parameter.

[0082] It should be noted that a low battery recovery ratio indicates that the vehicle’s energy recovery efficiency is low and the battery is in a low energy recovery state, requiring other means to improve the energy recovery efficiency.

[0083] In order to calculate an accurate battery recycling ratio, the generating of the battery recycling ratio according to the battery state parameter and the vehicle state parameter includes:

[0084] Calculating battery recovery power according to the battery health status and battery cell temperature;

[0085] Calculating the vehicle recovery torque according to the vehicle speed, the accelerator pedal opening and the brake pedal opening;

[0086] Calculating vehicle recovery power according to the vehicle recovery torque and the motor speed;

[0087] A battery recovery ratio is generated according to the battery recovery power and the vehicle recovery power.

[0088] In the specific implementation, the calculation formula of battery recovery power is:

[0089] Pbat=f(SOC,Tbat)

[0090] Wherein, f() is obtained based on the fitting of the battery bench test results, SOC is the battery charge, and Tbat is the battery temperature.

[0091] The calculation formula of vehicle recovery torque is:

[0092]

[0093] Where V is the vehicle speed, is the accelerator pedal opening, is the brake pedal opening;

[0094] The calculation formula of vehicle recovery power is:

[0095] Pveh=Tveh*n / 9550

[0096] Where n is the motor speed and Tveh is the vehicle recovery torque.

[0097] The formula for calculating the battery recycling ratio is:

[0098] δ=Pbat / Pveh

[0099] Among them, Pbat is the battery recovery power and Pveh is the vehicle recovery power.

[0100] Step S202: When the battery recovery ratio is less than a preset ratio threshold, it is determined that the battery of the target vehicle is in a low recovery state.

[0101] It can be understood that the preset ratio threshold can be set to 90%, that is, if the battery recycling ratio is <90%, it can be determined that the battery is in a low recycling state.

[0102] Step S203: Control the electric drive circuit to operate in a low recovery state.

[0103] In a specific implementation, controlling the electric drive circuit to operate in a low recovery state refers to sending a request for a low-efficiency power state to the electric drive so that a low-efficiency working point is selected for operation while ensuring the driving torque. In this embodiment, the working efficiency of the electric drive can be divided into three working intervals: [60%, 70%], [70%, 80%], and [80%, 90%]. The efficiency interval of the electric drive can be set with reference to a preset torque-efficiency chart, wherein the preset torque-efficiency chart can be set with reference to Figure 7 .

[0104] Step S204: determining the heat recovery mode of the vehicle according to the ratio interval of the battery recovery ratio.

[0105] It should be understood that the first heat recovery mode mainly recovers excess heat through the electric drive cooling circuit; the second heat recovery mode mainly recovers excess heat through the air-conditioning system for heating the cabin; and the third heat recovery mode mainly recovers excess heat through the battery.

[0106] Further, determining the heat recovery mode of the vehicle according to the ratio interval of the battery recovery ratio includes:

[0107] When the battery recovery ratio is in a first efficiency range, determining that the vehicle is operated in a first heat recovery mode;

[0108] When the battery recovery ratio is in a second efficiency range, determining that the vehicle is operated in a second heat recovery mode, and a minimum value of the second efficiency range is greater than a maximum value of the first efficiency range;

[0109] When the battery recovery ratio is in a third efficiency range, it is determined that the vehicle is running in a third heat recovery mode, and a minimum value of the third efficiency range is greater than a maximum value of the second efficiency range.

[0110] In the specific implementation, the battery recovery ratio can be divided into three gears: [0, δ1), [δ1, δ2], (δ2, 90%), and the corresponding electric drive working efficiency can be divided into three working ranges: [60%, 70%], [70%, 80%], and [80%, 90%].

[0111] Further, the electric drive circuit parameter includes a coolant temperature in the electric drive circuit;

[0112] The determining of the heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter and the electric drive circuit parameter further includes:

[0113] When there is a heating demand in the vehicle air conditioning system and the coolant temperature is greater than a first temperature threshold, driving the vehicle to operate in a second heat recovery mode;

[0114] When there is no heating demand in the vehicle air conditioning system, determining a temperature difference between the coolant temperature and the battery core temperature;

[0115] When the temperature difference is greater than a second temperature threshold and the battery cell temperature is less than a rated heating temperature of the battery, the vehicle is driven to operate in a third heat recovery mode.

[0116] It can be understood that the first temperature threshold can be set to 0° C., and the second temperature threshold can be set to 5° C., and this embodiment does not impose any specific limitation on this.

[0117] In the specific implementation, refer to Figure 8 , the air conditioner will request heating and the coolant temperature TCOOLANT>0℃, drive the vehicle to operate in the second heat recovery mode; when the air conditioner does not need to recover the heat of the electric drive, judge whether the battery recovery mode meets the conditions. When the coolant temperature TCOOLANT-Tbat>5℃ and the battery cell temperature Tbat<the rated heating temperature of the battery T0, drive the vehicle to operate in the third heat recovery mode, where T0 refers to the upper limit of the battery heating temperature. When the conditions are met, the third heat recovery mode, i.e., the battery recovery mode, can be entered.

[0118] Furthermore, the vehicle thermal management method further includes:

[0119] When the heat recovery mode is the first heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve are connected, the first selection end of the four-way valve and the second selection end of the four-way valve are connected, the third selection end of the four-way valve and the fourth selection end of the four-way valve are connected, and the first water pump is controlled to run at a first speed;

[0120] When the heat recovery mode is the second heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve, the first selection end of the four-way valve and the second selection end of the four-way valve are connected, the third selection end of the four-way valve and the fourth selection end of the four-way valve are connected, the first water pump is controlled to operate at a first speed, and the air conditioning circuit is controlled to operate in an electric drive heat absorption mode;

[0121] When the heat recovery mode is the third heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve, the first selection end of the four-way valve and the fourth selection end of the four-way valve, the third selection end of the four-way valve and the second selection end of the four-way valve are connected, the first water pump is controlled to operate at a second speed, the second water pump is controlled to operate at a third speed, and the air-conditioning circuit is controlled to operate in a battery heat absorption mode, the first speed is less than the third speed, and the third speed is less than the second speed.

[0122] In the specific implementation, in the first heat recovery mode, the three-way valve 6 takes the ②① path, the water pump 2 operates at 60%, and the four-way valve 9①② / ③④ is connected. At this time, the electric drive water circuit will recover excess heat; in the second heat recovery mode, the three-way valve 6 takes the ②① path, the water pump 2 operates at 60%, the four-way valve 9①② / ③④ is connected, the air conditioner enters the electric drive heat absorption mode, the compressor 12 and the electronic expansion valve 14 work as requested, and the air conditioning system will recover excess heat for heating the cabin; in the third heat recovery mode, the three-way valve 6 takes the ②① path, the water pump 2 operates at 90%, the water pump 11 operates at 70%, the four-way valve 9①④ / ③② is connected, and the battery will recover excess heat.

[0123] This embodiment determines the working efficiency of the vehicle's electric drive and further determines the heat recovery mode of the vehicle by calculating the battery recovery ratio. The heat recovery mode of the vehicle can also be determined by the coolant temperature in the electric drive circuit and whether there is a heating demand for the air conditioner, thereby improving the heat recovery efficiency, meeting the user's usage needs, and improving comfort.

[0124] In addition, an embodiment of the present invention further provides a storage medium, on which a vehicle thermal management program is stored. When the vehicle thermal management program is executed by a processor, the steps of the vehicle thermal management method described above are implemented.

[0125] Since the storage medium adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be described one by one here.

[0126] Reference Fig. 9 , Fig. 9 This is a structural block diagram of the first embodiment of the vehicle thermal management device of the present invention.

[0127] like Fig. 9 As shown, the vehicle thermal management device proposed in the embodiment of the present invention includes:

[0128] The acquisition module 10 is used to acquire vehicle state parameters, battery state parameters and electric drive circuit parameters of the target vehicle.

[0129] It is worth noting that the basic principle of the power recovery system is that during coasting or braking, the vehicle controller requests the motor to output negative torque to achieve vehicle energy recovery. The energy recovery intensity is limited by the battery's allowable charging power. The battery's recharging power is generally related to the SOC and the battery cell temperature, such as Figure 3 As shown, when the battery is at low temperature and high SOC, the vehicle's energy recovery ability is very low. When the vehicle is coasting or braking, the recovery ability is weakened and a large amount of energy can only be consumed in the friction torque of the brake disc.

[0130] To solve the above problems, refer to Figure 3 , this embodiment proposes a thermal management device arranged in a vehicle, including: an electric drive cooling circuit, a battery cooling circuit, a warm air cooling circuit and a refrigerant circuit, the electric drive cooling circuit includes a kettle 1, a first water pump 2, an AC / DC converter 3, a rear electric drive 4, a front electric drive 5, an electromagnetic three-way valve 6, a radiator 7, an electric drive circuit heat exchanger 8 and a four-way valve 9; the battery coolant circuit includes a water pump 11, a battery 10 and a four-way valve 9; the warm air coolant circuit includes a water pump 18, a water-cooled condenser 13, an electric heater 16 and a warm air core 17; the refrigerant circuit includes a compressor 12, a water-cooled condenser 13, an electronic expansion valve 14, an external heat exchanger 15 and an electric drive circuit heat exchanger 8.

[0131] In a specific implementation, the battery recharging power is generally related to the SOC and the battery cell temperature. In extreme environments, in order to increase the battery recharging power, the present embodiment can increase the battery cell temperature so that the battery cell temperature is in a more appropriate range. When adjusting the battery cell temperature, the operation of the compressor of the refrigerant circuit can allow the high-temperature and high-pressure refrigerant to exchange heat with the electric drive coolant circuit through the electric drive circuit heat exchanger 8, and then through the battery coolant circuit, the battery cell temperature is increased to improve the energy recovery efficiency.

[0132] In addition, the high-temperature and high-pressure refrigerant can also undergo heat exchange through the water-cooled condenser 13 in the warm air coolant circuit, thereby transferring excess heat to the interior of the vehicle for heating or cooling, adjusting the temperature inside the cabin, and improving energy recovery efficiency and user experience.

[0133] The thermal management control device in this embodiment also includes a vehicle controller VCU, a battery management system BMS, an electric drive controller MCU, an air conditioning system AC, and a thermal management system execution end. The interaction relationship between each system is referenced Figure 4 .

[0134] In addition, the temperature of the vehicle's electric drive can also be controlled through the electric drive circuit heat exchanger 8 in the electric drive coolant circuit, so as to warm up the vehicle and reduce vehicle energy consumption when the temperature is low in winter. In this scenario, when the first selection end and the second selection end of the three-way valve are connected, the refrigerant can reduce the coolant temperature in the electric drive circuit through the external heat exchanger, thereby controlling the temperature of the entire vehicle's electric drive. If the second selection end and the third selection end of the electromagnetic three-way valve are connected, the entire electric drive circuit can be kept at a suitable temperature to maintain the vehicle's operating stability.

[0135] It can be understood that the vehicle status parameters include but are not limited to vehicle speed, accelerator pedal opening, brake pedal opening and motor speed; the battery status parameters include but are not limited to battery health status and battery cell temperature; the electric drive circuit parameters include the coolant temperature in the electric drive circuit.

[0136] The determination module 20 is used to determine the heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter and the electric drive circuit parameter.

[0137] It should be noted that the vehicle in this embodiment has three heat recovery modes, namely the first heat recovery mode, the second heat recovery mode and the third heat recovery mode. The first heat recovery mode mainly recovers excess heat through the electric drive cooling circuit; the second heat recovery mode mainly recovers excess heat through the air-conditioning system for heating the cabin; the third heat recovery mode mainly recovers excess heat through the battery.

[0138] The control module 30 is used to control the operating state of the thermal management device according to the control strategy corresponding to the heat recovery mode.

[0139] It is understandable that different control modes correspond to different control strategies to achieve different heat recovery effects, wherein the operating state of the thermal management device is controlled mainly by the connectivity state of the electromagnetic three-way valve, the connectivity state of the four-way valve, the adjustment of the operating state of the first water pump, and at least one of the operating state of the second water pump. This embodiment does not impose specific restrictions on this.

[0140] In one embodiment, the determination module 20 is further used to generate a battery recovery ratio based on the battery status parameters and the vehicle status parameters; when the battery recovery ratio is less than a preset ratio threshold, determine that the battery of the target vehicle is in a low recovery state; control the electric drive circuit to operate in a low recovery state; and determine the thermal recovery mode of the vehicle based on the ratio interval in which the battery recovery ratio is located.

[0141] In one embodiment, the determination module 20 is further used to determine that the vehicle is operating in a first heat recovery mode when the battery recovery ratio is in a first efficiency range; to determine that the vehicle is operating in a second heat recovery mode when the battery recovery ratio is in a second efficiency range, and the minimum value of the second efficiency range is greater than the maximum value of the first efficiency range; and to determine that the vehicle is operating in a third heat recovery mode when the battery recovery ratio is in a third efficiency range, and the minimum value of the third efficiency range is greater than the maximum value of the second efficiency range.

[0142] In one embodiment, the determination module 20 is further used to calculate the battery recovery power according to the battery health status and the battery cell temperature; calculate the vehicle recovery torque according to the vehicle speed, the accelerator pedal opening and the brake pedal opening; calculate the vehicle recovery power according to the vehicle recovery torque and the motor speed; and generate a battery recovery ratio according to the battery recovery power and the vehicle recovery power.

[0143] In one embodiment, the determination module 20 is further used to drive the vehicle to operate in a second heat recovery mode when there is a heating demand in the vehicle air-conditioning system and the coolant temperature is greater than a first temperature threshold; to determine a temperature difference between the coolant temperature and the battery cell temperature when there is no heating demand in the vehicle air-conditioning system; and to drive the vehicle to operate in a third heat recovery mode when the temperature difference is greater than a second temperature threshold and the battery cell temperature is less than a rated heating temperature of the battery.

[0144] In one embodiment, the control module 30 is also used to adjust the connectivity status of the electromagnetic three-way valve and the four-way valve according to the control strategy corresponding to the heat recovery mode; and / or adjust the operating status of the first water pump and / or the second water pump according to the control strategy corresponding to the heat recovery mode.

[0145] In one embodiment, the control module 30 is further used to connect the first selection end of the three-way valve and the second selection end of the three-way valve, connect the first selection end of the four-way valve and the second selection end of the four-way valve, connect the third selection end of the four-way valve and the fourth selection end of the four-way valve, and control the first water pump to operate at a first speed when the heat recovery mode is the first heat recovery mode; connect the first selection end of the three-way valve and the second selection end of the three-way valve, the first selection end of the four-way valve and the second selection end of the four-way valve, connect the third selection end of the four-way valve and the fourth selection end of the four-way valve when the heat recovery mode is the second heat recovery mode. The fourth selection end of the three-way valve is connected, the first water pump is controlled to run at a first speed, and the air-conditioning circuit is controlled to run in an electric drive heat absorption mode; when the heat recovery mode is the third heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve, the first selection end of the four-way valve and the fourth selection end of the four-way valve are connected, the third selection end of the four-way valve and the second selection end of the four-way valve are connected, the first water pump is controlled to run at a second speed, the second water pump is controlled to run at a third speed, and the air-conditioning circuit is controlled to run in a battery heat absorption mode, the first speed is less than the third speed, and the third speed is less than the second speed.

[0146] This embodiment determines the heat recovery mode of the vehicle according to the vehicle state parameters, battery state parameters and electric drive circuit parameters of the target vehicle, thereby adapting to different environments. In different environments, the operating state of each component in the thermal management device in the vehicle is controlled according to the heat recovery mode and control strategy corresponding to the environment, thereby avoiding the technical problem of low vehicle kinetic energy recovery efficiency in extreme environments in the prior art.

[0147] It should be understood that the above is only an example and does not constitute any limitation on the technical solution of the present invention. In specific applications, technicians in this field can make settings as needed, and the present invention does not limit this.

[0148] It should be noted that the workflow described above is merely illustrative and does not limit the scope of protection of the present invention. In practical applications, technicians in this field can select part or all of them according to actual needs to achieve the purpose of the present embodiment, and no limitation is made here.

[0149] In addition, for technical details that are not described in detail in this embodiment, reference can be made to the vehicle thermal management method provided in any embodiment of the present invention, and will not be repeated here.

[0150] In addition, it should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0151] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0152] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present invention, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as a read-only memory (ROM) / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention.

[0153] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A vehicle thermal management method, characterized in that: The vehicle thermal management method is applied to a thermal management device, the thermal management device comprising: an electric drive cooling circuit, a battery cooling circuit, a warm air cooling circuit and a refrigerant circuit, the electric drive cooling circuit comprising a first water pump, an electromagnetic three-way valve, a four-way valve and an electric drive circuit heat exchanger, the electric drive cooling circuit is connected to the refrigerant circuit through the electric drive circuit heat exchanger, the electric drive cooling circuit is connected to the battery cooling circuit through the four-way valve, the electromagnetic three-way valve is used to adjust the water flow direction of the electric drive cooling circuit, the refrigerant circuit comprises a water-cooled heat exchanger, the refrigerant circuit is connected to the warm air cooling circuit through the water-cooled heat exchanger, the battery cooling circuit comprises a second water pump and a battery, the second water pump is used to control the flow of water in the battery cooling circuit to heat the battery; The vehicle thermal management method comprises: Obtain vehicle status parameters, battery status parameters, and electric drive circuit parameters of the target vehicle; Determining a heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter, and the electric drive circuit parameter; Controlling the operating state of the thermal management device according to the control strategy corresponding to the heat recovery mode; The determining the heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter and the electric drive circuit parameter comprises: generating a battery recovery ratio for recovering kinetic energy according to the battery state parameter and the vehicle state parameter; When the battery recovery ratio is less than a preset ratio threshold, determining that the battery of the target vehicle is in a low recovery state; Controlling the electric drive circuit to operate in a low recovery state; Determining a heat recovery mode of the vehicle according to a ratio interval in which the battery recovery ratio is located; The determining the heat recovery mode of the vehicle according to the ratio interval of the battery recovery ratio includes: When the battery recovery ratio is in a first efficiency range, determining that the vehicle is operated in a first heat recovery mode, wherein the first heat recovery mode mainly recovers excess heat through the electric drive cooling circuit; When the battery recovery ratio is in a second efficiency range, determining that the vehicle is operated in a second heat recovery mode, a minimum value of the second efficiency range is greater than a maximum value of the first efficiency range, and the second heat recovery mode mainly recovers excess heat through an air conditioning system for heating the vehicle cabin; When the battery recovery ratio is in a third efficiency range, it is determined that the vehicle is operating in a third heat recovery mode, the minimum value of the third efficiency range is greater than the maximum value of the second efficiency range, and the third heat recovery mode mainly recovers excess heat through the battery.

2. The vehicle thermal management method according to claim 1, characterized in that: The vehicle status parameters include vehicle speed, accelerator pedal opening, brake pedal opening and motor speed, and the battery status parameters include battery health status and battery cell temperature; The generating a battery recycling ratio according to the battery status parameter and the vehicle status parameter comprises: Calculating battery recovery power according to the battery health status and battery cell temperature; Calculating the vehicle recovery torque according to the vehicle speed, the accelerator pedal opening and the brake pedal opening; Calculating vehicle recovery power according to the vehicle recovery torque and the motor speed; A battery recovery ratio is generated according to the battery recovery power and the vehicle recovery power.

3. The vehicle thermal management method according to claim 1, characterized in that: The electric drive circuit parameters include the coolant temperature in the electric drive circuit; The determining of the heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter and the electric drive circuit parameter further includes: When there is a heating demand in the vehicle air conditioning system and the coolant temperature is greater than a first temperature threshold, driving the vehicle to operate in a second heat recovery mode; When there is no heating demand in the vehicle air conditioning system, determining a temperature difference between the coolant temperature and the battery cell temperature; When the temperature difference is greater than a second temperature threshold and the battery cell temperature is less than a rated heating temperature of the battery, the vehicle is driven to operate in a third heat recovery mode.

4. The vehicle thermal management method according to any one of claims 1 to 3, characterized in that: The controlling the operating state of the thermal management device according to the control strategy corresponding to the heat recovery mode includes: adjusting the connection state between the electromagnetic three-way valve and the four-way valve according to the control strategy corresponding to the heat recovery mode; and / or The operating state of the first water pump and / or the second water pump is adjusted according to the control strategy corresponding to the heat recovery mode.

5. The vehicle thermal management method according to any one of claims 1 to 4, characterized in that: The vehicle thermal management method further includes: When the heat recovery mode is the first heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve are connected, the first selection end of the four-way valve and the second selection end of the four-way valve are connected, the third selection end of the four-way valve and the fourth selection end of the four-way valve are connected, and the first water pump is controlled to run at a first speed; When the heat recovery mode is the second heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve, the first selection end of the four-way valve and the second selection end of the four-way valve are connected, the third selection end of the four-way valve and the fourth selection end of the four-way valve are connected, the first water pump is controlled to operate at the first speed, and the air conditioning circuit is controlled to operate in the electric drive heat absorption mode; When the heat recovery mode is the third heat recovery mode, the first selection end of the three-way valve and the second selection end of the three-way valve, the first selection end of the four-way valve and the fourth selection end of the four-way valve, the third selection end of the four-way valve and the second selection end of the four-way valve are connected, the first water pump is controlled to operate at a second speed, the second water pump is controlled to operate at a third speed, and the air-conditioning circuit is controlled to operate in a battery heat absorption mode, the first speed is less than the third speed, and the third speed is less than the second speed.

6. A vehicle thermal management device, characterized in that: The vehicle thermal management device is applied to a thermal management device, and the thermal management device includes: an electric drive cooling circuit, a battery cooling circuit, a warm air cooling circuit and a refrigerant circuit. The electric drive cooling circuit includes a first water pump, an electromagnetic three-way valve, a four-way valve and an electric drive circuit heat exchanger. The electric drive cooling circuit is connected to the refrigerant circuit through the electric drive circuit heat exchanger, and the electric drive cooling circuit is connected to the battery cooling circuit through the four-way valve. The electromagnetic three-way valve is used to adjust the water flow direction of the electric drive cooling circuit. The refrigerant circuit includes a water-cooled heat exchanger, and the refrigerant circuit is connected to the warm air cooling circuit through the water-cooled heat exchanger. The battery cooling circuit includes a second water pump and a battery. The second water pump is used to control the flow of water in the battery cooling circuit to heat the battery. The vehicle thermal management device comprises: An acquisition module, used to acquire vehicle state parameters, battery state parameters and electric drive circuit parameters of the target vehicle; a determination module, configured to determine a heat recovery mode of the vehicle according to at least one of the vehicle state parameter, the battery state parameter, and the electric drive circuit parameter; The determination module is further configured to generate a battery recovery ratio for recovering kinetic energy according to the battery state parameter and the vehicle state parameter; determine that the battery of the target vehicle is in a low recovery state when the battery recovery ratio is less than a preset ratio threshold; control the electric drive circuit to operate in a low recovery state; and determine a heat recovery mode of the vehicle according to a ratio interval in which the battery recovery ratio is located; The determination module is further used to determine that the vehicle is running in a first heat recovery mode when the battery recovery ratio is in a first efficiency range, and the first heat recovery mode mainly recovers excess heat through the electric drive cooling circuit; when the battery recovery ratio is in a second efficiency range, determine that the vehicle is running in a second heat recovery mode, the minimum value of the second efficiency range is greater than the maximum value of the first efficiency range, and the second heat recovery mode mainly recovers excess heat through the air conditioning system for heating the cabin; when the battery recovery ratio is in a third efficiency range, determine that the vehicle is running in a third heat recovery mode, the minimum value of the third efficiency range is greater than the maximum value of the second efficiency range, and the third heat recovery mode mainly recovers excess heat through the battery; A control module is used to control the operating state of the thermal management device according to a control strategy corresponding to the heat recovery mode.

7. A vehicle thermal management device, characterized in that: The vehicle thermal management device comprises: a memory, a processor, and a vehicle thermal management program stored in the memory and executable on the processor, wherein the vehicle thermal management program is configured to implement the vehicle thermal management method according to any one of claims 1 to 5.

8. A storage medium, characterized in that: The storage medium stores a vehicle thermal management program, and when the vehicle thermal management program is executed by the processor, the vehicle thermal management method according to any one of claims 1 to 5 is implemented.

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