An electric drive heat management method and device, vehicle and storage medium

Abstract

This invention discloses an electric drive thermal management method, a device, a vehicle, and a storage medium, relating to the field of electric drive thermal systems. The electric drive thermal management method includes the following steps: acquiring the temperature of the electric drive, the over-temperature and torque limiting temperatures under driving conditions, and the over-temperature and torque limiting temperatures under energy recovery conditions; adjusting the coolant flow rate provided by the vehicle based on the temperature of the electric drive; and controlling the linear limiting torque of the electric drive based on the temperature of the electric drive, the over-temperature and torque limiting temperatures under driving conditions, and the over-temperature and torque limiting temperatures under energy recovery conditions. This invention can achieve intelligent regulation of cooling demand, reducing the possibility of over-temperature alarms during electric drive operation.

Description

Technical Field

[0001] This invention belongs to the field of electric thermal drive system technology, and specifically relates to an electric thermal drive management method, device, vehicle, and storage medium. Background Technology

[0002] Against the backdrop of the rapid development of new energy vehicle technology, cooling methods and over-temperature protection strategies for electric drive systems have become one of the key research topics.

[0003] Currently, the most widely used cooling method is electric drive cooling control based on fixed flow rate demand. However, it suffers from slow cooling response and rigid control.

[0004] The most common over-temperature protection strategy currently used in the market is to limit torque simultaneously under both drive and energy recovery conditions. However, this cannot cool down the electric drive system in a short time, and the temperature will continue to rise after torque limitation, seriously affecting the vehicle's drivability and acceleration performance. Summary of the Invention

[0005] The purpose of this invention is to provide an electric thermal management method, device, vehicle, and storage medium to solve one or more technical problems existing in the prior art.

[0006] The technical solution adopted to solve the above-mentioned technical problems is as follows: This invention discloses an electric drive thermal management method, comprising the following steps: Acquire the temperature of the electric drive, the over-temperature and over-torque temperature under drive conditions, and the over-temperature and over-torque temperature under energy recovery conditions; The flow rate of coolant supplied to the vehicle is adjusted according to the temperature of the electric drive. The linear limiting torque of the electric drive is controlled based on the temperature of the electric drive, the over-temperature and over-torque limiting temperature of the drive operation, and the over-temperature and over-torque limiting temperature of the energy recovery operation.

[0007] The present invention has at least the following beneficial effects: It predicts the temperature performance of the coolant during operation based on the electric drive temperature, adjusts the output coolant flow rate in advance, eliminates the cooling delay caused by coolant transmission lag, and avoids abnormal rises in electric drive temperature. It controls the drive torque limit and energy recovery torque limit of the electric drive based on the electric drive temperature, the over-temperature torque limit temperature of the drive operation, and the over-temperature torque limit temperature of the energy recovery operation. This allows the braking system to participate in the electric drive thermal management cooling, ensuring that the vehicle speed does not deteriorate and reducing or eliminating the driver's perception of temperature changes. The cooling purpose is achieved without affecting the overall drivability of the vehicle.

[0008] Furthermore, since both coolant flow regulation and torque limiting control are performed simultaneously based on the electric drive temperature, the electric drive thermal management method combines cooling and torque limiting to efficiently achieve faster cooling of the electric drive and reduce the possibility of the electric drive temperature continuing to rise. The electric drive thermal management method can intelligently regulate cooling requirements, reduce the possibility of over-temperature alarms during electric drive operation, and does not affect the control strategies of other controllers in the vehicle. It requires no additional work and incurs no cost, resulting in low development costs and a short development cycle.

[0009] As a further improvement to the above technical solution, the coolant flow rate includes a first flow rate, a second flow rate, and a third flow rate, ranging from high to low. Adjusting the coolant flow rate provided by the vehicle according to the temperature of the electric drive includes the following steps: when At that time, adjust the coolant flow rate supplied by the vehicle to the first flow rate; when and At that time, adjust the coolant flow rate supplied by the vehicle to the first flow rate; when and Adjust the coolant flow rate supplied by the vehicle to the second flow rate; when and At that time, adjust the coolant flow rate supplied by the vehicle to the third flow rate; in, The temperature of the electric drive, The over-temperature and torque limiting temperature for the aforementioned drive operating conditions. The temperature rise slope of the electric drive. To set a time, This is the maximum permissible temperature for electric drives.

[0010] As a further improvement to the above technical solution, the step of controlling the linear limiting torque of the electric drive based on the temperature of the electric drive, the over-temperature and over-torque limiting temperature of the drive condition, and the over-temperature and over-torque limiting temperature of the energy recovery condition further includes the following steps: when At that time, the electric drive linearly limits the peak torque of the drive; when At that time, the electric drive linearly limits the peak torque of energy recovery.

[0011] As a further improvement to the above technical solution, the electric drive thermal management method also includes the following steps: The over-temperature and over-torque limit temperature of the energy recovery operating condition is lower than that of the over-temperature and over-torque limit temperature of the drive operating condition.

[0012] As a further improvement to the above technical solution, the over-temperature and torque limiting temperature of the energy recovery operating condition is determined by... Calculated and obtained.

[0013] As a further improvement to the above technical solution, when When the control energy recovery torque limit is zero, the electric drive linearly limits the peak torque of the drive.

[0014] As a further improvement to the above technical solution, the electric drive thermal management method is applied to motors or electronic controls.

[0015] This invention discloses an electric thermal management device, comprising: The acquisition module is used to acquire the temperature of the electric drive, the over-temperature and over-torque limit temperature under drive conditions, and the over-temperature and over-torque limit temperature under energy recovery conditions. The adjustment module is used to adjust the flow rate of coolant supplied to the vehicle according to the electric drive temperature; The control module is used to control the linear limiting torque of the electric drive based on the temperature of the electric drive, the over-temperature and over-torque limiting temperature of the drive operation, and the over-temperature and over-torque limiting temperature of the energy recovery operation.

[0016] The present invention discloses a vehicle, the vehicle including a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the electric drive thermal management method described above.

[0017] The present invention discloses a computer-readable storage medium storing a computer program, characterized in that the computer program, when executed by a processor, implements the electric drive thermal management method described above. Attached Figure Description

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a flowchart of the electric drive thermal management method provided in the embodiments of the present invention; Figure 2 This is a flowchart of adjusting the coolant flow rate provided in an embodiment of the present invention; Figure 3 This is a flowchart of the control electric drive linear limiting torque provided in the embodiment of the present invention; Figure 4 This is a schematic diagram of the cooling system provided in an embodiment of the present invention; Figure 5 This is a control block diagram of the cooling system provided in an embodiment of the present invention. Detailed Implementation

[0019] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0020] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0021] In the description of this invention, the use of terms such as "a number" means one or more, with "more than" meaning two or more. Terms like "greater than," "less than," and "exceeding" are understood to exclude the stated number, while terms like "above," "below," and "within" are understood to include the stated number. The use of terms like "first," "second," and "third" is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, the number of indicated technical features, or the sequential relationship between indicated technical features.

[0022] In the description of this invention, unless otherwise explicitly defined, terms such as "setting," "installing," and "connecting" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0023] In related technologies, the cooling method for electric drive systems uses temperature sensors to collect temperature data and sends cooling demand signals of different levels, with the vehicle providing a fixed flow rate to achieve heat dissipation and cooling of the electric drive system. However, this solution has significant shortcomings: First, the cooling response is slow, failing to promptly suppress the rise in electric drive temperature. From the issuance of the signal to the control of the flow rate and its application to the electric drive, it typically takes about 1 minute, causing the temperature to continue rising shortly after the electric drive over-temperature alarm, thus triggering a higher level of torque limiting. Second, the control is rigid and does not dynamically adjust according to actual operating conditions. Under low-speed, light-load conditions, the electric drive generates less heat, and outputting a fixed flow rate of cooling water according to the corresponding level results in energy waste.

[0024] In related technologies, the method of limiting torque in electric drive systems that simultaneously operate under both drive and energy recovery conditions has significant shortcomings: First, when an over-temperature alarm occurs, the heat has often already accumulated to a certain extent, and even increasing the coolant flow rate cannot achieve cooling in a short time; Second, after torque limitation occurs, the temperature will continue to rise, and the degree of torque limitation will continue to increase. Frequent over-temperature torque limitation in electric drives will seriously affect the drivability and acceleration performance of the vehicle, and may even pose safety hazards under special operating conditions; Third, if the problem of frequent over-temperature torque limitation is to be solved, the electromagnetic scheme needs to be redesigned, which involves a large amount of development work and high costs. Moreover, when the conditions for whole-vehicle testing are met, mass production is often already close, and the tight schedule may lead to delays in mass production.

[0025] Reference Figures 1 to 5The following are several embodiments of an electric thermal management method, apparatus, vehicle, and storage medium of the present invention.

[0026] like Figures 1 to 3 As shown, the electric drive thermal management method of this invention includes the following steps: Step S100: Obtain the temperature of the electric drive, the over-temperature and over-torque limit temperature under drive conditions, and the over-temperature and over-torque limit temperature under energy recovery conditions.

[0027] Step S200: Adjust the flow rate of coolant supplied by the vehicle according to the temperature of the electric drive.

[0028] Step S300: Control the linear limiting torque of the electric drive based on the temperature of the electric drive, the over-temperature torque limiting temperature of the drive operating condition, and the over-temperature torque limiting temperature of the energy recovery.

[0029] Understandably, electric drive thermal management methods are applied to vehicles in their entirety. At the vehicle level, electric drive thermal management methods need to work in conjunction with other systems such as batteries and air conditioning to achieve efficient energy utilization through an integrated thermal management system. This enables overall coordination of vehicle thermal management and helps optimize energy distribution, which is especially crucial in winter or under high-load conditions.

[0030] It is understandable that the electric drive thermal management method is applied to an electric motor, and obtaining the temperature of the electric drive can be the stator temperature or the rotor temperature of the motor. In this embodiment, obtaining the temperature of the electric drive is actually obtaining the stator temperature of the motor, and the electric drive thermal management method uses the stator temperature of the motor to regulate the motor's cooling function and torque limiting function.

[0031] In some embodiments, the electric drive thermal management method can be applied to a motor controller (i.e., an electronic control unit). Obtaining the temperature of the electric drive is actually obtaining the temperature of the key parts of the electronic control unit that generate the most heat and are most prone to overheating, such as the chip of the power module or its corresponding heat dissipation substrate. The temperature of these parts directly determines whether the electronic control unit can operate safely. This enables the electric drive thermal management method to regulate the cooling function and torque limiting function of the electronic control unit.

[0032] In other embodiments, the electric drive thermal management method can be applied to both the motor and the motor controller. When the coolant flow rates required by the motor and the controller are different, the coolant flow rate provided by the vehicle is adjusted according to the larger flow rate. When the torque limiting functions required by the motor and the controller are different, the control is executed according to the stricter torque limiting value.

[0033] In step S100, the electric drive is equipped with a temperature sensor for detecting temperature, and the temperature of the electric drive is obtained by detecting the temperature through the temperature sensor.

[0034] Understandably, the over-temperature and torque limiting temperature for drive operation is set according to the electric drive settings. For example, in this embodiment, the electric drive is a motor with insulation class H. The maximum temperature limit for a class H motor is 180°C. Since the temperature sensor is located on the stator winding, due to process and material limitations, the temperature detected by the temperature sensor will deviate from the actual temperature of the motor by about 20°C. Therefore, the maximum allowable temperature of the motor is set to 160°C. When the obtained motor temperature exceeds 160°C, the motor will experience insulation failure and other problems, resulting in irreversible damage. In this case, the over-temperature and torque limiting temperature for drive operation is set to 150°C based on the maximum allowable temperature.

[0035] Understandably, the over-temperature and torque limiting temperature under energy recovery conditions is calculated based on the over-temperature and torque limiting temperature under drive conditions and the temperature rise slope of the motor.

[0036] In step S200, based on the acquired electric drive temperature, the motor control unit (MCU) sends a first cooling demand signal, a second cooling demand signal, or a third cooling demand signal to the cooling system. The coolant flow rate provided by the vehicle's cooling system includes a first flow rate, a second flow rate, and a third flow rate, from high to low. When the motor sends the first cooling demand signal, the coolant flow rate provided by the vehicle is the first flow rate; when the motor sends the second cooling demand signal, the coolant flow rate provided by the vehicle is the second flow rate; and when the motor sends the third cooling demand signal, the coolant flow rate provided by the vehicle is the third flow rate. The control logic and signal interaction of the cooling system are optimized based on the electric drive temperature.

[0037] In step S300, the electric drive thermal management method automatically adjusts the linear torque limit of the drive condition and the linear torque limit of the energy recovery condition based on the electric drive temperature, the over-temperature and over-torque limit temperature of the drive condition, and the over-temperature and over-torque limit temperature of the energy recovery condition.

[0038] This configuration, by predicting the temperature performance of the coolant during operation, pre-adjusts the output coolant flow rate, eliminating the cooling delay caused by coolant delivery lag and preventing abnormal temperature rise in the electric drive. Based on the electric drive temperature, over-temperature torque limiting temperatures during drive operation, and over-temperature torque limiting temperatures during energy recovery operation, the drive torque limit and energy recovery torque limit are controlled, allowing the braking system to participate in electric drive thermal management for cooling. The vehicle speed will not decrease, and the reduction or imperceptibility to the driver is minimized, achieving the cooling goal without affecting the vehicle's drivability.

[0039] Furthermore, since both coolant flow regulation and torque limiting control are performed simultaneously based on the electric drive temperature, the electric drive thermal management method combines cooling and torque limiting to efficiently achieve faster cooling of the electric drive and reduce the possibility of the electric drive temperature continuing to rise. The electric drive thermal management method can intelligently regulate cooling requirements, reduce the possibility of over-temperature alarms during electric drive operation, and does not affect the control strategies of other controllers in the vehicle. It requires no additional work and incurs no cost, resulting in low development costs and a short development cycle.

[0040] It is understood that step S200 includes steps S210, S220, S230, and S240, such as... Figure 2 As shown.

[0041] Step S210, when At that time, adjust the coolant flow rate provided by the vehicle to the first flow rate.

[0042] in, This refers to the electric drive temperature, which is the temperature detected by the temperature sensor. To obtain the over-temperature and torque limit temperature of the drive condition, when the electric drive temperature exceeds the over-temperature and torque limit temperature of the drive condition, a high-grade first-flow coolant is used to cool the electric drive.

[0043] Step S220, when and At that time, adjust the coolant flow rate provided by the vehicle to the first flow rate.

[0044] in, The temperature rise slope of the electric drive; To set a time; This is the maximum permissible temperature for electric drives.

[0045] Understandably, in electric drive thermal management, the temperature rise slope is the rate at which the temperature of critical components of the electric drive rises over time during operation. It is a key dynamic indicator that can assess the rate of change of the electric drive's thermal load, predict overheating risks, and trigger protection strategies. The temperature rise slope reflects how quickly the controller's temperature rises per unit time, directly affecting the response decision of the coolant flow rate.

[0046] By adjusting the coolant flow rate supplied to the vehicle through the temperature rise slope, factors such as ambient temperature, user driving style, and current driving conditions are indirectly taken into account. This effectively improves the adaptability and energy efficiency of the coolant supply to the cooling system and eliminates the influence of various factors such as ambient temperature and vehicle driving conditions on the electric drive thermal management method.

[0047] With this configuration, the electric thermal management method can reduce coolant flow and coolant circulation energy consumption under low ambient temperature and low load conditions, thereby saving energy consumption of the entire vehicle.

[0048] It is understandable that the maximum allowable temperature of the electric drive is less than the high temperature protection limit of the motor shaft end.

[0049] Step S230, when and Adjust the coolant flow rate supplied by the vehicle to the second flow rate.

[0050] Step S240, when and At that time, adjust the coolant flow rate provided by the vehicle to the third flow rate.

[0051] In this embodiment, the first flow rate is 12. The second flow rate is 8. The third flow rate is 4. .

[0052] In this embodiment, This indicates the temperature difference between the temperature measured by the temperature sensor and the temperature 6 seconds ago. The 6-second setting is based on the vehicle's 0-100 km / h acceleration time of 6 seconds. Set to 1 minute.

[0053] Understandable ,in, This refers to the over-temperature and torque limit temperature under energy recovery operating conditions.

[0054] It is understandable that step S300 also includes steps S310 and S320, such as... Figure 3 As shown.

[0055] Step S310, when At that time, the electric drive linearly limits the peak torque of the drive.

[0056] Step S320, when At that time, the electric drive linearly limits the peak torque of energy recovery.

[0057] With this configuration, when the electric drive temperature is higher than the over-temperature torque limit temperature for energy recovery operation but lower than the over-temperature torque limit temperature for drive operation, the peak torque for energy recovery is linearly limited; when the electric drive temperature is higher than the over-temperature torque limit temperature for drive operation, the peak torque for drive operation is linearly limited. This electric drive thermal management method allows the linear limiting of peak torque for energy recovery and peak torque for drive to alternate as the electric drive temperature increases.

[0058] Understandably, the over-temperature and over-torque limit temperature during energy recovery operation passes through... Obtained through calculation.

[0059] Furthermore, when the electric drive temperature reaches the over-temperature torque limit temperature of the drive operation, the energy recovery torque of the electric drive is controlled to be zero, and the peak drive torque is limited.

[0060] This invention also provides an electric thermal management device, including an acquisition module, an adjustment module, and a control module.

[0061] Understandably, the acquisition module is used to acquire the temperature of the electric drive, the over-temperature and over-torque limits under drive conditions, and the over-temperature and over-torque limits under energy recovery conditions. Specifically, the acquisition module includes a temperature control unit and a calculation unit. The temperature control unit is used to detect the temperature of the electric drive; the calculation unit is used to input the over-temperature and over-torque limits under drive conditions, the set time, and the time change based on the data of the electric drive (such as the insulation class of the motor). and the temperature change of the electric drive within the time change. The calculation unit calculates the temperature rise slope of the electric drive, and then calculates the over-temperature and over-torque temperature of the energy recovery condition based on the temperature rise slope, the set time, and the over-temperature and over-torque temperature of the drive condition.

[0062] Understandably, the adjustment module is used to regulate the coolant flow rate provided by the vehicle based on the electric drive temperature obtained by the acquisition module. The adjustment module includes a motor control unit and a vehicle control unit (VCU). The motor control unit receives the cooling demand signal from the motor and sends the corresponding coolant flow rate request to the vehicle control unit. The vehicle control unit then controls the water pump to output the corresponding coolant flow rate, such as... Figure 5 As shown.

[0063] Understandably, a cooling system includes a radiator and a water pump, such as... Figure 4 As shown. Taking an electric motor as an example, the water pump outputs coolant to the motor. The motor control unit detects the flow rate of the coolant output by the water pump. The motor is cooled by the coolant. The coolant is input into the radiator for heat dissipation and then flows back into the water tank to be pumped out by the water pump again to the motor.

[0064] Understandably, the control module is used to control the linear torque limiting of the electric drive based on the electric drive temperature, the over-temperature torque limiting temperature of the drive operating condition, and the over-temperature torque limiting temperature of the energy recovery operating condition. Specifically, when the acquired electric drive temperature is higher than the over-temperature torque limiting temperature of the energy recovery operating condition, the control module controls the peak torque of the energy recovery operating condition to begin linear torque limiting; when the acquired electric drive temperature continues to rise to the over-temperature torque limiting temperature of the drive operating condition, the control module controls the energy recovery torque to zero and begins to control the peak torque of the drive operating condition to begin linear torque limiting.

[0065] This invention also provides a vehicle, including a memory, a processor, and a program stored in the memory and executable on the processor. When the program is executed by the processor, it implements the electric drive thermal management method of the above embodiments.

[0066] Taking the example of a processor and memory in a vehicle being connected via a bus, memory, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs and non-transitory computer-executable programs. Furthermore, memory may include high-speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, memory may optionally include memory remotely located relative to the control processor, and these remote memories can be connected to the control device via a network.

[0067] The non-transient software program and instructions required to implement the electric drive thermal management method of the above embodiments are stored in memory. When executed by a processor, the electric drive thermal management method of the above embodiments is executed. For example, executing... Figure 1 Method steps S100 to S300 Figure 2 Method steps S210 to S240, Figure 3 The method steps S310 and S320, etc.

[0068] The device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separate; that is, they may be located in one place or distributed across multiple network units. Some or all of the modules can be selected to achieve the purpose of this embodiment according to actual needs.

[0069] The vehicles in this embodiment of the invention can be electric or hybrid private cars, such as sedans, SUVs, MPVs, or pickup trucks. The vehicles can also be electric or hybrid commercial vehicles, such as vans, buses, small trucks, or large trailers.

[0070] Since the vehicle applies all the technical solutions of the above-described electric thermal management method, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0071] Furthermore, one embodiment of the present invention provides a computer-readable storage medium storing computer-executable instructions for performing the aforementioned air conditioner control method. Exemplarily, the above-described method is executed... Figures 1 to 3 The methods and steps in the text.

[0072] It is worth noting that, since the computer-readable storage medium of the present invention can execute the electric thermal management method of any of the above embodiments, the specific implementation and technical effects of the computer-readable storage medium of the present invention can be referred to the specific implementation and technical effects of the electric thermal management method of any of the above embodiments.

[0073] Furthermore, one embodiment of the present invention also provides a computer program product, including a computer program or computer instructions, which are stored in a computer-readable storage medium. A processor of a computer device reads the computer program or computer instructions from the computer-readable storage medium and executes the computer program or computer instructions, causing the computer device to perform the above-described electric thermal management method. Exemplarily, the above-described method is performed... Figures 1 to 3 The methods and steps in the text.

[0074] It is worth noting that, since the computer program product of this embodiment can execute the electric drive thermal management method of any of the above embodiments, the specific implementation method and technical effect of the computer program product of this embodiment can refer to the specific implementation method and technical effect of the electric drive thermal management method of any of the above embodiments.

[0075] It will be understood by those skilled in the art that all or some of the steps and systems in the methods disclosed above can be implemented as software, firmware, hardware, and suitable combinations thereof. Some or all of the physical components can be implemented as software executed by a processor, such as a central processing unit, digital signal processor, or microprocessor, or as hardware, or as an integrated circuit, such as an application-specific integrated circuit. Such software can be distributed on a computer-readable medium, which can include computer storage media (or non-transitory media) and communication media (or transient media). As is known to those skilled in the art, the term computer storage media includes volatile and non-volatile, removable and non-removable media implemented in any method or technology for storing information (such as computer-readable instructions, data structures, program modules, or other data). Computer storage media includes, but is not limited to, RAM, ROM, EEPROM, flash memory or other memory technologies, CD-ROM, digital versatile disc (DVD) or other optical disc storage, magnetic cartridges, magnetic tape, disk storage or other magnetic storage devices, or any other medium that can be used to store desired information and is accessible to a computer. Furthermore, as is known to those skilled in the art, communication media typically include computer-readable instructions, data structures, program modules, or other data in modulated data signals such as carrier waves or other transmission mechanisms, and may include any information delivery medium.

[0076] The preferred embodiments of the present invention have been described in detail above, but the present invention is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of the present invention, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. An electric drive thermal management method, characterized in that, Includes the following steps: Acquire the temperature of the electric drive, the over-temperature and over-torque temperature under drive conditions, and the over-temperature and over-torque temperature under energy recovery conditions; The flow rate of coolant supplied to the vehicle is adjusted according to the temperature of the electric drive. The linear limiting torque of the electric drive is controlled based on the temperature of the electric drive, the over-temperature and over-torque limiting temperature of the drive operation, and the over-temperature and over-torque limiting temperature of the energy recovery operation.

2. The electric drive thermal management method according to claim 1, characterized in that, The coolant flow rate includes a first flow rate, a second flow rate, and a third flow rate, ranging from high to low. Adjusting the coolant flow rate supplied by the vehicle according to the electric drive temperature includes the following steps: when At that time, adjust the coolant flow rate supplied by the vehicle to the first flow rate; when and At that time, adjust the coolant flow rate supplied by the vehicle to the first flow rate; when and Adjust the coolant flow rate supplied by the vehicle to the second flow rate; when and At that time, adjust the coolant flow rate supplied by the vehicle to the third flow rate; in, The temperature of the electric drive, The over-temperature and torque limiting temperature for the aforementioned drive operating conditions. The temperature rise slope of the electric drive. To set a time, This is the maximum permissible temperature for electric drives.

3. The electric drive thermal management method according to claim 1, characterized in that, The method of controlling the linear limiting torque of the electric drive based on the temperature of the electric drive, the over-temperature and over-torque limiting temperature of the drive condition, and the over-temperature and over-torque limiting temperature of the energy recovery condition further includes the following steps: when At that time, the electric drive linearly limits the peak torque of the drive; when At that time, the electric drive linearly limits the peak torque of energy recovery.

4. The electric drive thermal management method according to claim 3, characterized in that, It also includes the following steps: The over-temperature and over-torque limit temperature of the energy recovery operating condition is lower than that of the over-temperature and over-torque limit temperature of the drive operating condition.

5. The electric drive thermal management method according to claim 4, characterized in that, The energy recovery operating condition over-temperature and torque limiting temperature is passed by Calculated and obtained.

6. The electric drive thermal management method according to claim 4, characterized in that, when When the control energy recovery torque limit is zero, the electric drive linearly limits the peak torque of the drive.

7. The electric drive thermal management method according to claim 1, characterized in that, The electric drive thermal management method is applied to motors or electronic controls.

8. An electric thermal management device, characterized in that, Including: The acquisition module is used to acquire the temperature of the electric drive, the over-temperature and over-torque limit temperature under drive conditions, and the over-temperature and over-torque limit temperature under energy recovery conditions. The adjustment module is used to adjust the flow rate of coolant supplied to the vehicle according to the electric drive temperature; The control module is used to control the linear limiting torque of the electric drive based on the temperature of the electric drive, the over-temperature and over-torque limiting temperature of the drive operation, and the over-temperature and over-torque limiting temperature of the energy recovery operation.

9. A vehicle, characterized in that, The vehicle includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the electric thermal management method according to any one of claims 1 to 7.

10. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the electric thermal management method according to any one of claims 1 to 7.

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