A powertrain temperature estimation method, device, vehicle controller and medium

Abstract

The present invention discloses a powertrain temperature estimation method, device, vehicle controller and medium. The method comprises: establishing a thermal management system simulation model; wherein the thermal management system simulation model comprises a powertrain simulation model and a thermal management component simulation model; determining the powertrain simulation temperature according to the total power generated by the powertrain, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the powertrain simulation temperature accuracy according to the powertrain simulation temperature and the actual powertrain temperature; obtaining a temperature sensor to collect the powertrain measurement temperature in the real thermal management system in real time, and determining the powertrain measurement temperature accuracy according to the powertrain measurement temperature and the actual powertrain temperature; determining the powertrain optimal temperature according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature and the powertrain measurement temperature accuracy. This scheme realizes the accurate measurement of the powertrain temperature.

Description

Technical Field

[0001] Embodiments of the present invention relate to temperature estimation technology, and more particularly to a powertrain temperature estimation method, device, vehicle controller, and medium. Background Art

[0002] The thermal management system for new energy vehicles (NEVs) connects each powertrain through cooling medium pipelines. This coolant exchanges heat between each powertrain and the external environment, ensuring that each powertrain operates within its optimal temperature range. Specifically, the vehicle controller uses temperature sensors to collect the temperatures of each powertrain and control the thermal management system's water pumps and fans to achieve heat exchange and achieve thermal equilibrium. The acquisition of individual powertrain and coolant temperatures is a key factor in achieving powertrain thermal management.

[0003] In existing technology, temperature sensors can collect temperature information, but the accuracy of different sensors varies, significantly affected by price. To reduce costs, using low-precision temperature sensors can lead to suboptimal control. If the temperature sensor detects a high temperature, the temperature threshold for the thermal management system will be high, causing the powertrain to operate at an inappropriate temperature for a long time, shortening its service life. If the temperature sensor detects a low temperature, the temperature threshold for the thermal management system will be low, increasing vehicle energy consumption and reducing driving range. Summary of the Invention

[0004] The present invention discloses a powertrain temperature estimation method, device, vehicle controller and medium, which realize accurate measurement of powertrain temperature, thereby achieving reliable control of the thermal management system.

[0005] In a first aspect, an embodiment of the present invention provides a method for estimating powertrain temperature, the method comprising:

[0006] Establishing a thermal management system simulation model; wherein the thermal management system simulation model includes a powertrain simulation model and a thermal management component simulation model;

[0007] Determining a powertrain simulated temperature based on the total power generated by the powertrain, the input power of the thermal management component, and simulation parameters determined by the thermal management system simulation model, and determining the accuracy of the powertrain simulated temperature based on the powertrain simulated temperature and the actual powertrain temperature;

[0008] Acquiring a temperature sensor to collect a powertrain measurement temperature in a real thermal management system in real time, and determining the powertrain measurement temperature accuracy based on the powertrain measurement temperature and the powertrain actual temperature;

[0009] An optimal powertrain temperature is determined according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy.

[0010] Optionally, determining the optimal powertrain temperature according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy includes:

[0011] determining the corrected powertrain simulated temperature according to the powertrain simulated temperature and the powertrain simulated temperature accuracy;

[0012] determining the powertrain corrected measured temperature according to the powertrain measured temperature and the powertrain measured temperature accuracy;

[0013] An optimal powertrain temperature is determined according to the powertrain corrected simulated temperature and the powertrain corrected measured temperature.

[0014] Optionally, the method further includes: detecting whether the temperature sensor fails;

[0015] When the temperature sensor fails, the temperature measurement accuracy of the powertrain is adjusted.

[0016] Optionally, also include:

[0017] Determining whether a change in the measured temperature of the powertrain is greater than a preset change within a preset time period;

[0018] If the change in the measured temperature of the powertrain is greater than the preset change, the accuracy of the simulated temperature of the powertrain is adjusted.

[0019] Optionally, the thermal management system simulation model includes a first thermal management system simulation model;

[0020] The first thermal management system simulation model includes a first powertrain simulation model and a first thermal management component model; the first powertrain simulation model includes a power motor, a DC converter and an on-board charger; the first thermal management component model includes a fan, a water pump and a heat exchange device; the power motor, the DC converter, the on-board charger, the water pump and the heat exchange device form a circulation loop through a cooling medium pipeline, and the fan is coupled to the heat exchange device.

[0021] Optionally, the thermal management system simulation model includes a second thermal management system simulation model;

[0022] The second thermal management system simulation model includes a second powertrain simulation model and a second thermal management component model; the second powertrain simulation model includes a power battery; the second thermal management component model includes an electric heating device, an electric cooling device and a water pump; the power battery, the electric heating device, the electric cooling device and the water pump form a circulation loop through a cooling medium pipeline.

[0023] In a second aspect, an embodiment of the present invention provides a powertrain temperature estimation device, the device comprising:

[0024] A simulation model building module is used to build a thermal management system simulation model based on powertrain test condition data; wherein the thermal management system simulation model includes simulation models of each powertrain and thermal management component simulation models;

[0025] a simulation temperature determination module, configured to determine a powertrain simulation temperature based on the total power generated by each powertrain, the input power of the thermal management component, and simulation parameters determined by the thermal management system simulation model, and to determine a powertrain simulation temperature accuracy based on the powertrain simulation temperature and the actual powertrain temperature;

[0026] A measured temperature determination module is used to obtain the measured temperature of each powertrain in the actual thermal management system collected in real time by the temperature sensor, and determine the powertrain measured temperature accuracy based on the powertrain measured temperature and the actual powertrain temperature;

[0027] The optimal temperature determination module is configured to determine the optimal temperature of the powertrain according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy.

[0028] In a third aspect, an embodiment of the present invention provides a vehicle controller, the vehicle controller comprising:

[0029] one or more processors;

[0030] a storage device for storing one or more programs,

[0031] When the one or more programs are executed by the one or more processors, the one or more processors implement the powertrain temperature estimation method as described in the first aspect.

[0032] In a fourth aspect, an embodiment of the present invention provides a storage medium comprising computer-executable instructions, which, when executed by a computer processor, are used to perform the powertrain temperature estimation method as described in the first aspect.

[0033] In an embodiment of the present invention, a thermal management system simulation model is established, wherein the thermal management system simulation model includes a powertrain simulation model and a thermal management component simulation model; the powertrain simulation temperature is then determined based on the total power generated by the powertrain, the input power of the thermal management component, and the simulation parameters determined by the thermal management system simulation model, and the powertrain simulation temperature accuracy is determined based on the powertrain simulation temperature and the actual powertrain temperature; the temperature sensor is then used to collect the powertrain measurement temperature in the actual thermal management system in real time, and the powertrain measurement temperature accuracy is determined based on the powertrain measurement temperature and the actual powertrain temperature; finally, the powertrain optimal temperature is determined based on the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy. In this way, the present solution achieves accurate measurement of the powertrain temperature, thereby achieving reliable control of the thermal management system. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is a flow chart of a powertrain temperature estimation method provided by an embodiment of the present invention;

[0035] Figure 2 Schematic diagram of a thermal management system simulation model provided by an embodiment of the present invention;

[0036] Figure 3 is a flow chart of another powertrain temperature estimation method provided by an embodiment of the present invention;

[0037] Figure 4 1 is a schematic structural diagram of a powertrain temperature estimation device provided by an embodiment of the present invention;

[0038] Figure 5 It is a structural diagram of a vehicle controller provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It will be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of them.

[0040] Figure 1 This is a flow chart of a powertrain temperature estimation method provided by an embodiment of the present invention. This embodiment is applicable to temperature estimation of various powertrains. The method can be executed by a powertrain temperature estimation device, such as Figure 1 As shown, the specific steps include:

[0041] S110 , establishing a thermal management system simulation model; wherein the thermal management system simulation model includes a powertrain simulation model and a thermal management component simulation model.

[0042] in, Figure 2 FIG. 1 is a schematic diagram of a thermal management system simulation model provided by an embodiment of the present invention. Figure 2 As shown, the thermal management system simulation model includes a first thermal management system simulation model 10. The first thermal management system simulation model 10 includes a first powertrain simulation model and a first thermal management component model. The first powertrain simulation model includes a power motor 11, a DC converter 12, and an onboard charger 13. The first thermal management component model includes a fan 31, a water pump 21, and a heat exchanger 41. The power motor 11, the DC converter 12, the onboard charger 13, the water pump 21, and the heat exchanger 41 form a circulation loop through a cooling medium pipeline 42. The water pump 21 drives the cooling medium through the cooling medium pipeline, controlling the flow rate of the cooling medium, thereby changing the amount of heat exchange between the cooling medium and the power batteries and the heat exchanger. The fan 31 accelerates heat exchange between the heat exchanger 41 and the atmosphere. The cooling medium pipeline 42 connects the powertrains to the heat exchanger 41. The first thermal management system simulation model is established based on performance test data from all thermal management operating conditions. The optimal parameters of the thermal management system that cover all operating conditions are fitted, thereby establishing the thermal management system simulation model. All thermal management conditions of the first thermal management system simulation model include power motor cooling conditions, DC converter cooling conditions and on-board charger cooling conditions; exemplarily, the power motor cooling condition process is that the vehicle controller controls the vehicle driving, the vehicle controller collects the electric power of the power motor, and at the same time collects the temperature signal of the power motor temperature sensor, judges the thermal state of the power motor, and controls the fan and water pump at the temperature threshold set by the thermal management control strategy; the power motor temperature sensor collects the temperature signal of the power motor after cooling, so that the optimal parameters of the power motor cooling condition can be determined according to the change of the power motor temperature signal and the electric power of the motor, the heat dissipation power of the fan and the water pump; the DC converter cooling condition and the on-board charger cooling condition determine their respective optimal parameters in a similar manner.

[0043] Optional, see Figure 2 , the thermal management system simulation model includes a second thermal management system simulation model 20;

[0044] The second thermal management system simulation model 20 includes a second powertrain simulation model and a second thermal management component model. The second powertrain simulation model includes the power battery 14. The second thermal management component model includes an electric heater 32, an electric cooler 33, and a water pump 21. The power battery 14, the electric heater 32, the electric cooler 33, and the water pump 21 form a circulation loop through a cooling medium pipeline 42. The electric heater and the electric cooler provide electric heat and cooling sources for the power battery. The second thermal management system simulation model is established based on performance test data from all thermal management operating conditions. The optimal parameters of the thermal management system covering all operating conditions are fitted to establish the simulation model of the second thermal management system. All thermal management conditions of the second thermal management system simulation model include power battery cooling conditions, power battery heating conditions, and power battery self-circulation processes. For example, the power battery cooling condition involves the vehicle controller collecting the power battery's electrical power and the temperature signal from the power battery temperature sensor to determine the power battery's thermal state and control the electric cooling device at the temperature threshold set by the thermal management control strategy. The power battery temperature sensor collects the temperature signal after cooling, and the optimal parameters for the power battery cooling condition can be determined based on the change in the power battery temperature signal, the power battery's electrical power, and the heat dissipation power of the electric cooling device. The optimal parameters for the power battery heating condition and the power battery self-circulation condition are determined similarly. It is understood that the vehicle thermal management system simulation model also includes other powertrain loops. For example, a loop can be formed by a power motor, an electric heating device, and an electric cooling device. The specific composition of the thermal management simulation model is not specifically limited here.

[0045] S120 , determining a powertrain simulated temperature based on the total power generated by the powertrain, the input power of the thermal management component, and simulation parameters determined by the thermal management system simulation model, and determining a powertrain simulated temperature accuracy based on the powertrain simulated temperature and the actual powertrain temperature.

[0046] Among them, the simulation parameters include the mass parameters and specific heat capacity parameters of the powertrain; in one circulation loop, the input power of the thermal management component is related to factors such as the heat dissipation power of the fan and heat exchange device and the flow rate of the water pump; in another circulation loop, the input power of the thermal management component is related to factors such as the heat dissipation power of the electric cooling device, the heat increase power of the electric heating device and the flow rate of the water pump. The input power of the thermal management component can be converted into the heat dissipation power of the powertrain or the heating power of the powertrain; in this way, the powertrain simulation temperature is determined in real time based on the real-time collected total power of the powertrain, the real-time collected input power of the thermal management component and the simulation parameters.

[0047] The powertrain simulation temperature accuracy is the degree of deviation of the powertrain simulation temperature from the actual powertrain temperature, wherein the actual powertrain temperature is the theoretical temperature value of the powertrain calculated according to a specific algorithm under specific working conditions; preferably, the powertrain simulation temperature accuracy can be obtained by calculating the variance of the differences between multiple powertrain simulation temperatures and the actual powertrain temperature, that is, the powertrain simulation temperature accuracy can be represented in the form of variance.

[0048] S130 , acquiring a temperature sensor to collect the measured temperature of each powertrain in the actual thermal management system in real time, and determining the powertrain measured temperature accuracy based on the powertrain measured temperature and the actual powertrain temperature.

[0049] The powertrain temperature measurement accuracy refers to the degree of deviation of the powertrain temperature measurement from the actual powertrain temperature. Preferably, the powertrain temperature measurement accuracy can be obtained by calculating the variance of the differences between multiple powertrain temperature measurements and the actual powertrain temperature. That is, the powertrain temperature measurement accuracy can be represented in the form of variance.

[0050] S140 : Determine the optimal powertrain temperature according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy.

[0051] By fusing the simulated and measured temperature signals, a more accurate temperature signal can be obtained. Specifically, the corrected simulated powertrain temperature is determined based on the simulated powertrain temperature and its accuracy; the corrected measured powertrain temperature is determined based on the measured powertrain temperature and its accuracy; and the optimal powertrain temperature is determined based on the corrected simulated powertrain temperature and the corrected measured powertrain temperature. This solution achieves precise measurement of the powertrain temperature, thereby enabling reliable control of the thermal management system.

[0052] Optionally, based on the above embodiment, further optimization is performed. Figure 3 is a flow chart of a powertrain temperature estimation method provided by an embodiment of the present invention, such as Figure 3 As shown, the method includes the following steps:

[0053] S210: Establish a thermal management system simulation model; wherein the thermal management system simulation model includes a powertrain simulation model and a thermal management component simulation model.

[0054] S220 : Determine a powertrain simulation temperature based on the total power generated by the powertrain, the input power of the thermal management component, and simulation parameters determined by a thermal management system simulation model, and determine a powertrain simulation temperature accuracy based on the powertrain simulation temperature.

[0055] S230: Acquire a temperature sensor to collect the powertrain measurement temperature in the actual thermal management system in real time, and determine the powertrain measurement temperature accuracy based on the powertrain measurement temperature.

[0056] S240 : Determine the optimal powertrain temperature according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy.

[0057] S250: Detect whether the temperature sensor is faulty; if the temperature sensor is faulty, adjust the powertrain temperature measurement accuracy.

[0058] Among them, when the temperature sensor fails, the powertrain measurement temperature in the actual thermal management system cannot be collected, and the powertrain measurement temperature is unreliable. The powertrain measurement temperature accuracy can be adjusted to 0, and the optimal powertrain temperature is directly determined by the powertrain simulation temperature.

[0059] S260: Determine whether the change in the measured temperature of each powertrain is greater than a preset change within a preset time; if the change in the measured temperature of each powertrain is greater than the preset change, adjust the powertrain simulation temperature accuracy.

[0060] Because the thermal management system model is static, the test data is also static, and the simulated powertrain temperature determined by the thermal management system model is also static data. If the temperature change rate detected by the temperature sensor exceeds a certain value, this operating condition is a dynamic characteristic of the thermal management system, which will reduce the simulation accuracy of the thermal management model. Therefore, under such operating conditions, improving the accuracy of the powertrain measured temperature signal and reducing the accuracy of the simulated powertrain temperature can ensure a more reliable and accurate optimal powertrain temperature. This solution, building on the above solution, is also applicable to providing a reliable powertrain temperature signal under different operating conditions.

[0061] An embodiment of the present invention further provides a powertrain temperature estimation device, which can execute the powertrain temperature estimation method provided by any embodiment of the present invention and has corresponding functional modules and beneficial effects of the execution method. Figure 4 FIG. 1 is a schematic diagram of a powertrain temperature estimation device provided by an embodiment of the present invention. Figure 4 As shown, the device includes:

[0062] A simulation model building module 10 is used to build a thermal management system simulation model; wherein the thermal management system simulation model includes a powertrain simulation model and a thermal management component simulation model;

[0063] a simulation temperature determination module 20 for determining a powertrain simulation temperature based on the total power generated by the powertrain, the input power of the thermal management component, and simulation parameters determined by the thermal management system simulation model, and determining the accuracy of the powertrain simulation temperature based on the powertrain simulation temperature and the actual powertrain temperature;

[0064] The measured temperature determination module 30 is used to obtain the powertrain measured temperature in the actual thermal management system collected in real time by the temperature sensor, and determine the powertrain measured temperature accuracy based on the powertrain measured temperature and the actual powertrain temperature;

[0065] The optimal temperature determination module 40 is configured to determine the optimal temperature of the powertrain according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy.

[0066] Optionally, the optimal temperature determination module 40 includes:

[0067] a first correction unit, configured to determine a corrected powertrain simulated temperature according to the powertrain simulated temperature and the powertrain simulated temperature accuracy;

[0068] a second correction unit, configured to determine a corrected powertrain measurement temperature according to the powertrain measurement temperature and the powertrain measurement temperature accuracy;

[0069] The optimal temperature determination unit is configured to determine the optimal temperature of the powertrain according to the corrected simulated temperature of the powertrain and the corrected measured temperature of the powertrain.

[0070] Optionally, also include:

[0071] A first detection module is used to detect whether the temperature sensor fails;

[0072] The first adjustment module is configured to adjust the temperature measurement accuracy of the powertrain when the temperature sensor fails.

[0073] Optionally, also include:

[0074] A second detection module, for determining, within a preset time, whether a change in the measured temperature of the powertrain is greater than a preset change;

[0075] The second adjustment module is configured to adjust the powertrain simulation temperature accuracy when the change in the powertrain measured temperature is greater than the preset change.

[0076] Figure 5 FIG. 1 is a structural diagram of a vehicle controller provided by an embodiment of the present invention. Figure 5As shown, the vehicle controller includes a processor 70, a memory 71, an input device 72 and an output device 73; the number of processors 70 in the vehicle controller can be one or more. Figure 5 In the figure, a processor 70 is used as an example; the processor 70, the memory 71, the input device 72 and the output device 73 in the vehicle controller can be connected by a bus or other means. Figure 5 The bus connection is taken as an example.

[0077] Memory 71, a computer-readable storage medium, can be used to store software programs, computer-executable programs, and modules, such as the program instructions / modules corresponding to the powertrain temperature estimation method in the embodiments of the present invention. Processor 70 executes the software programs, instructions, and modules stored in memory 71 to execute various vehicle controller functions and data processing, thereby implementing the aforementioned powertrain temperature estimation method.

[0078] The memory 71 may primarily include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the terminal's usage. Furthermore, the memory 71 may include high-speed random access memory and non-volatile memory, such as at least one disk storage device, flash memory device, or other non-volatile solid-state memory device. In some examples, the memory 71 may further include memory remotely located relative to the processor 70, and these remote memories may be connected to the vehicle controller via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0079] The input device 72 may be used to receive input digital or character information and generate key signal input related to user settings and function control of the vehicle controller. The output device 73 may include a display device such as a display screen.

[0080] An embodiment of the present invention further provides a storage medium containing computer-executable instructions. When the computer-executable instructions are executed by a computer processor, the computer-executable instructions are used to perform a powertrain temperature estimation method. The method includes:

[0081] Establishing a thermal management system simulation model; wherein the thermal management system simulation model includes a powertrain simulation model and a thermal management component simulation model;

[0082] Determining a powertrain simulated temperature based on the total power generated by the powertrain, the input power of the thermal management component, and simulation parameters determined by the thermal management system simulation model, and determining the accuracy of the powertrain simulated temperature based on the powertrain simulated temperature and the actual powertrain temperature;

[0083] Acquiring a temperature sensor to collect the measured temperature of each powertrain in the actual thermal management system in real time, and determining the powertrain measured temperature accuracy based on the powertrain measured temperature and the actual powertrain temperature;

[0084] An optimal powertrain temperature is determined according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy.

[0085] Of course, the storage medium containing computer-executable instructions provided in an embodiment of the present invention is not limited to the method operations described above, and can also execute related operations in the powertrain temperature estimation method provided in any embodiment of the present invention.

[0086] Through the above description of the implementation methods, those skilled in the art can clearly understand that the present invention can be implemented with the help of software and necessary general-purpose hardware, and of course it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as a computer floppy disk, read-only memory (ROM), random access memory (RAM), flash memory (FLASH), hard disk or optical disk, etc., including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each embodiment of the present invention.

[0087] It is worth noting that in the embodiment of the above-mentioned search device, the various units and modules included are only divided according to functional logic, but are not limited to the above-mentioned division, as long as the corresponding functions can be achieved; in addition, the specific names of the functional units are only for the convenience of distinguishing each other, and are not used to limit the scope of protection of the present invention.

[0088] Note that the above are only preferred embodiments of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and that various obvious changes, readjustments, and substitutions can be made by those skilled in the art without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A method for estimating powertrain temperature, characterized in that: include: Establishing a thermal management system simulation model; wherein the thermal management system simulation model includes a powertrain simulation model and a thermal management component simulation model; Determining a powertrain simulation temperature according to the total power generated by the powertrain, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and determining the accuracy of the powertrain simulation temperature according to the powertrain simulation temperature and the actual powertrain temperature; Acquiring a temperature sensor to collect a powertrain measurement temperature in a real thermal management system in real time, and determining a powertrain measurement temperature accuracy based on the powertrain measurement temperature and the powertrain actual temperature; Determining a powertrain optimal temperature according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy; Wherein, determining the optimal temperature of the powertrain according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature and the powertrain measurement temperature accuracy includes: Determining the powertrain corrected simulated temperature according to the powertrain simulated temperature and the powertrain simulated temperature accuracy; Wherein, the powertrain simulation temperature accuracy is obtained by performing variance calculation on the difference between a plurality of powertrain simulation temperatures and the powertrain actual temperature; determining the powertrain corrected measured temperature according to the powertrain measured temperature and the powertrain measured temperature accuracy; Wherein, the powertrain measurement temperature accuracy is obtained by performing variance calculation on the difference between a plurality of powertrain measurement temperatures and the powertrain actual temperature; The optimal temperature of the powertrain is determined according to the corrected simulated temperature of the powertrain and the corrected measured temperature of the powertrain.

2. The powertrain temperature estimation method according to claim 1, characterized in that: Also includes: Detecting whether the temperature sensor fails; When the temperature sensor fails, the temperature measurement accuracy of the powertrain is adjusted.

3. The powertrain temperature estimation method according to claim 1, characterized in that: Also includes: Determine within a preset time whether a change in the measured temperature of the powertrain is greater than a preset change; If the change in the measured temperature of the powertrain is greater than the preset change, the accuracy of the simulated temperature of the powertrain is adjusted.

4. The powertrain temperature estimation method according to claim 1, characterized in that: The thermal management system simulation model includes a first thermal management system simulation model; The first thermal management system simulation model includes a first powertrain simulation model and a first thermal management component model; the first powertrain simulation model includes a power motor, a DC converter and an on-board charger; the first thermal management component model includes a fan, a water pump and a heat exchange device; the power motor, the DC converter, the on-board charger, the water pump and the heat exchange device form a circulation loop through a cooling medium pipeline, and the fan is coupled to the heat exchange device.

5. The powertrain temperature estimation method according to claim 1, characterized in that: The thermal management system simulation model includes a second thermal management system simulation model; The second thermal management system simulation model includes a second powertrain simulation model and a second thermal management component model; the second powertrain simulation model includes a power battery; the second thermal management component model includes an electric heating device, an electric cooling device and a water pump; the power battery, the electric heating device, the electric cooling device and the water pump form a circulation loop through a cooling medium pipeline.

6. A powertrain temperature estimation device, characterized in that: include: A simulation model building module is used to build a thermal management system simulation model; wherein the thermal management system simulation model includes a powertrain simulation model and a thermal management component simulation model; a simulation temperature determination module, used to determine the powertrain simulation temperature according to the total power generated by the powertrain, the input power of the thermal management component and the simulation parameters determined by the thermal management system simulation model, and to determine the powertrain simulation temperature accuracy according to the powertrain simulation temperature; A measurement temperature determination module, used to obtain the temperature of each powertrain in the real thermal management system collected by the temperature sensor in real time, and determine the accuracy of the powertrain measurement temperature according to the powertrain measurement temperature; an optimal temperature determination module, configured to determine an optimal temperature of a powertrain according to the powertrain simulation temperature, the powertrain simulation temperature accuracy, the powertrain measurement temperature, and the powertrain measurement temperature accuracy; Wherein, the optimal temperature determination module includes: A first correction unit, configured to determine the powertrain correction simulation temperature according to the powertrain simulation temperature and the powertrain simulation temperature accuracy; Wherein, the powertrain simulation temperature accuracy is obtained by performing variance calculation on the difference between a plurality of powertrain simulation temperatures and the powertrain actual temperature; A second correction unit, configured to determine the power assembly corrected measurement temperature according to the power assembly measurement temperature and the power assembly measurement temperature accuracy; Wherein, the powertrain measurement temperature accuracy is obtained by performing variance calculation on the difference between a plurality of powertrain measurement temperatures and the powertrain actual temperature; The optimal temperature determination unit is used to determine the optimal temperature of the powertrain according to the corrected simulated temperature of the powertrain and the corrected measured temperature of the powertrain.

7. A vehicle controller, characterized in that: The vehicle controller comprises: one or more processors; a storage device for storing one or more programs, When the one or more programs are executed by the one or more processors, the one or more processors implement the powertrain temperature estimation method as described in any one of claims 1-5.

8. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to perform the powertrain temperature estimation method as claimed in any one of claims 1 to 5 when executed by a computer processor.

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