Temperature control method and system of power system, storage medium and vehicle

Abstract

The invention provides a temperature control method and system of a power system, a storage medium and a vehicle, and belongs to the technical field of vehicles, and the temperature control method of the power system comprises the steps that a first influence parameter of a gearbox on the temperature of a driving motor assembly is obtained, and a first temperature adjustment interval is determined, based on a second influence parameter of the driving motor assembly on the temperature of the gearbox, a second temperature adjusting interval is determined; and the current temperature of the driving motor assembly is adjusted to the first temperature in the first temperature adjusting interval, and the current temperature of the gearbox is adjusted to the second temperature in the second temperature adjusting interval. According to the method, the temperature adjusting intervals which can be achieved by the driving motor assembly and the gearbox are determined according to the influence parameters of the temperatures of the driving motor assembly and the gearbox, and then the temperatures of the driving motor assembly and the gearbox are controlled to be the temperature with the highest efficiency in the corresponding temperature adjusting intervals, so that the total efficiency of the power system is located at the peak value which can be reached currently; the technical effect of improving the overall efficiency of the power system is achieved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a temperature control method, system, storage medium and vehicle of a power system. Background Art

[0002] The power system refers to the system that provides driving force for the vehicle. In the power system with electric energy as the main energy source, it usually includes the drive motor, the controller of the drive motor, and the gearbox connected to the drive motor. The best temperature range for the highest working efficiency of the drive motor and its controller is usually around 40℃, while the best temperature range for the highest working efficiency of the gearbox is usually around 90℃. In order to achieve the highest working efficiency of the power system, the temperature of the drive motor and its controller can be controlled at 40℃, and the temperature of the gearbox can be controlled at 90℃.

[0003] However, in the actual control process of the power system, there is heat exchange between the drive motor and its controller and the gearbox due to the close separation. Therefore, due to the limitation of the cooling capacity of the cooling system, at least one of the drive motor, the drive motor controller and the gearbox will not be able to operate in the optimal temperature range, thereby making the overall efficiency of the power system always at a low level. Summary of the invention

[0004] Based on this, the present application provides a temperature control method, system, storage medium and vehicle for a power system to solve the problem of how to improve the overall efficiency of the power system.

[0005] In a first aspect of an embodiment of the present application, a temperature control method for a power system is provided, wherein the power system includes a drive motor assembly and a gearbox, and the method includes: Acquire a first influencing parameter of the gearbox on the temperature of the drive motor assembly, and a second influencing parameter of the drive motor assembly on the temperature of the gearbox; Determine a first temperature adjustment interval corresponding to the current temperature of the drive motor assembly based on the first influencing parameter, and determine a second temperature adjustment interval corresponding to the current temperature of the gearbox based on the second influencing parameter; Adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjusting the current temperature of the gearbox to a second temperature in the second temperature adjustment interval; The first temperature is the temperature when the efficiency of the drive motor assembly is at a peak value, and the second temperature is the temperature when the efficiency of the gearbox is at a peak value.

[0006] Optionally, obtaining a first influencing parameter of the gearbox on the temperature of the drive motor assembly, and a second influencing parameter of the drive motor assembly on the temperature of the gearbox, comprises: Acquire state parameters of the current environment of the drive motor assembly and the gearbox, wherein the state parameters include at least one of temperature, humidity and wind speed; The first influencing parameter is determined based on the state parameter corresponding to the driving motor assembly, and the second influencing parameter is determined based on the state parameter corresponding to the gearbox.

[0007] Optionally, before adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval and adjusting the current temperature of the gearbox to a second temperature in the second temperature adjustment interval, the method further includes: Obtaining a target total efficiency, the target total efficiency comprising a maximum total efficiency or a peak total efficiency of the power system, the maximum total efficiency being determined based on a maximum efficiency of the drive motor assembly and a maximum efficiency of the gearbox, the peak total efficiency being determined based on a peak efficiency of the drive motor assembly when the temperature is within the first temperature adjustment interval, and a peak efficiency of the gearbox when the temperature is within the second temperature adjustment interval; determining a current overall efficiency of the powertrain system based on a current first efficiency of the drive motor assembly and a current second efficiency of the gearbox; The step of adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjusting the current temperature of the gearbox to a second temperature in the second temperature adjustment interval, comprises: When the difference between the current total efficiency and the target total efficiency is greater than a preset threshold, the current temperature of the drive motor assembly is adjusted to a first temperature in the first temperature adjustment interval, and the current temperature of the gearbox is adjusted to a second temperature in the second temperature adjustment interval.

[0008] Optionally, before determining the current total efficiency of the power system based on the current first efficiency of the drive motor assembly and the current second efficiency of the gearbox, the method further includes: Inputting the current first operating condition parameter of the drive motor assembly into a first efficiency calculation model to obtain the current first efficiency output by the first efficiency calculation model, wherein the first operating condition parameter includes input voltage, input current and temperature; and inputting a current second operating condition parameter of the gearbox into a second efficiency calculation model to obtain the current second efficiency output by the second efficiency calculation model, wherein the second operating condition parameter includes input torque, input speed, oil sump temperature, and gear position; The first efficiency calculation model includes a derivation relationship between the first operating condition parameter and the first efficiency, and the second efficiency calculation model includes a derivation relationship between the second operating condition parameter and the second efficiency.

[0009] Optionally, before inputting the current first operating condition parameter of the drive motor assembly into the first efficiency calculation model and inputting the current second operating condition parameter of the gearbox into the second efficiency calculation model, the method further includes: Acquire a target model, where the target model includes the first efficiency calculation model and / or the second efficiency calculation model; The step of obtaining the target model comprises: Acquire parameter samples corresponding to the target model, wherein the parameter samples corresponding to the first efficiency calculation model include the plurality of first operating parameters and the first efficiencies corresponding to the respective first operating parameters, and the parameter samples corresponding to the second efficiency calculation model include the plurality of second operating parameters and the second efficiencies corresponding to the respective second operating parameters; Establishing an initial target model based on the parameter samples corresponding to the target model; Acquire test data corresponding to the target model, wherein the test data corresponding to the first efficiency calculation model includes the actual efficiency of the drive motor assembly under a plurality of the first operating parameters, and the test data corresponding to the second efficiency calculation model includes the actual efficiency of the gearbox under a plurality of the second operating parameters; Based on the test data corresponding to the target model, the derivation relationship in the initial target model is modified to obtain the target model.

[0010] Optionally, the power system further includes a first temperature regulating device for regulating the temperature of the drive motor assembly, and a second temperature regulating device for regulating the temperature of the gearbox, wherein the step of adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature regulating interval, and adjusting the current temperature of the gearbox to a second temperature in the second temperature regulating interval comprises: Determine a first temperature adjustment power of the first temperature adjustment device based on the current temperature of the drive motor assembly and the first temperature, and determine a second temperature adjustment power of the second temperature adjustment device based on the current temperature of the gearbox and the second temperature; The first temperature adjustment device is controlled to output the first temperature adjustment power, and the second temperature adjustment device is controlled to output the second temperature adjustment power.

[0011] Optionally, the first temperature regulating device includes a lubricating oil circuit for lubricating the drive motor assembly, and determining a first temperature regulating power of the first temperature regulating device based on a current temperature of the drive motor assembly and the first temperature includes: Determining a first estimated power based on a difference between a current temperature of the drive motor assembly and the first temperature, and determining whether the current temperature of the drive motor assembly is greater than the first temperature; If not, obtaining a second estimated power, and determining the larger of the first estimated power and the second estimated power as the first temperature adjustment power, wherein the second estimated power is determined based on the lubrication requirement of the drive motor assembly; If so, the maximum power and the third estimated power of the first temperature control device are obtained, and the minimum of the first estimated power, the maximum power and the third estimated power is determined as the first temperature control power, and the third estimated power is determined based on the acoustic roughness requirement of the vehicle.

[0012] In a second aspect of an embodiment of the present application, a temperature control system of a power system is provided, wherein the power system includes a drive motor assembly and a gearbox, and the temperature control system includes: An acquisition module, used to acquire a first influence parameter of the gearbox on the temperature of the drive motor assembly, and a second influence parameter of the drive motor assembly on the temperature of the gearbox; a determination module, configured to determine a first temperature adjustment interval corresponding to a current temperature of the drive motor assembly based on the first influencing parameter, and to determine a second temperature adjustment interval corresponding to a current temperature of the gearbox based on the second influencing parameter; an execution module, configured to adjust the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjust the current temperature of the gearbox to a second temperature in the second temperature adjustment interval; The first temperature is the temperature when the efficiency of the drive motor assembly is at a peak value, and the second temperature is the temperature when the efficiency of the gearbox is at a peak value.

[0013] According to a third aspect of an embodiment of the present application, a computer-readable storage medium is provided, on which a computer program is stored. When the program is executed by a processor, the steps of the temperature control method of the power system described in the second aspect of the present application are implemented.

[0014] According to a fourth aspect of an embodiment of the present application, a vehicle is provided, comprising the temperature control system of the power system described in the second aspect of the embodiment of the present application, or comprising a control module, wherein the control module is used to implement the steps of the temperature control method of the power system described in the first aspect of the embodiment of the application.

[0015] The present application provides a temperature control method, system, storage medium and vehicle for a power system, the method comprising: obtaining a first influencing parameter of the gearbox on the temperature of the drive motor assembly, and a second influencing parameter of the drive motor assembly on the temperature of the gearbox; determining a first temperature adjustment interval corresponding to the current temperature of the drive motor assembly based on the first influencing parameter, and determining a second temperature adjustment interval corresponding to the current temperature of the gearbox based on the second influencing parameter; adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjusting the current temperature of the gearbox to a second temperature in the second temperature adjustment interval; wherein the first temperature is the temperature when the efficiency of the drive motor assembly is at its peak, and the second temperature is the temperature when the efficiency of the gearbox is at its peak.

[0016] The present application first determines the first temperature adjustment interval that can be achieved by the drive motor assembly through the first influencing parameter of the gearbox on the temperature of the drive motor assembly, and determines the second temperature adjustment interval that can be achieved by the gearbox through the second influencing parameter of the drive motor assembly on the temperature of the gearbox. After determining the first temperature adjustment interval and the second temperature adjustment interval, the current temperature of the drive motor assembly is adjusted to the first temperature in the first temperature adjustment interval, and the current temperature of the gearbox is adjusted to the second temperature in the second temperature adjustment interval. The present application first determines the temperature adjustment interval that can be achieved by each of the drive motor assembly and the gearbox through the influencing parameters of each other's temperature, and then controls each temperature to the most efficient temperature in the corresponding temperature adjustment interval, so that the total efficiency of the power system is at the peak value that can be achieved at present, and achieves the technical effect of improving the overall efficiency of the power system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the description of the embodiments of the present application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 It is a step diagram of a temperature control method of a power system provided in an embodiment of the present application; Figure 2 It is a step diagram of a method for determining influencing parameters provided in an embodiment of the present application; Figure 3 It is a step diagram of a method for determining the timing of temperature control of a power system provided in an embodiment of the present application; Figure 4It is a schematic diagram of a curve showing the relationship between the efficiency of a drive motor assembly and a gearbox and the change in temperature provided in an embodiment of the present application; Figure 5 It is a schematic diagram of a curve showing the relationship between the efficiency of a drive motor and a controller of the drive motor and temperature changes provided in an embodiment of the present application; Figure 6 It is a step diagram of a method for obtaining a target model provided in an embodiment of the present application; Figure 7 This is a step diagram of a method for adjusting temperature provided in an embodiment of the present application; Figure 8 It is a structural schematic diagram of a first temperature regulating device and a second temperature regulating device provided in an embodiment of the present application; Fig. 9 is a step diagram of a method for determining a first temperature adjustment power provided in an embodiment of the present application; Fig.10 is a flow chart of a temperature control method of a power system provided in an embodiment of the present application; Fig.11 It is a structural schematic diagram of a temperature control system of a power system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] The power system refers to the system that provides driving force for the vehicle. In the power system with electric energy as the main energy source, it usually includes the drive motor, the controller of the drive motor, and the gearbox connected to the drive motor. The best temperature range for the highest working efficiency of the drive motor and its controller is usually around 40℃, while the best temperature range for the highest working efficiency of the gearbox is usually around 90℃. In order to achieve the highest working efficiency of the power system, the temperature of the drive motor and its controller can be controlled at 40℃, and the temperature of the gearbox can be controlled at 90℃.

[0021] However, in the actual control process of the power system, there is heat exchange between the drive motor and its controller and the gearbox due to the close separation. Therefore, due to the limitation of the cooling capacity of the cooling system, at least one of the drive motor, the drive motor controller and the gearbox will not be able to operate in the optimal temperature range, thereby making the overall efficiency of the power system always at a low level.

[0022] Based on this, in order to solve the problem of how to improve the overall efficiency of the power system, the present application provides a temperature control method, system, storage medium and vehicle for a power system. First, the first temperature adjustment range that can be achieved by the drive motor assembly is determined through the first influencing parameter of the gearbox on the temperature of the drive motor assembly, and the second temperature adjustment range that can be achieved by the gearbox is determined through the second influencing parameter of the drive motor assembly on the temperature of the gearbox. After determining the first temperature adjustment range and the second temperature adjustment range, the current temperature of the drive motor assembly is adjusted to the first temperature in the first temperature adjustment range, and the current temperature of the gearbox is adjusted to the second temperature in the second temperature adjustment range. The present application first determines the temperature adjustment range that can be achieved by each of the drive motor assembly and the gearbox based on the influencing parameters of each other's temperature, and then controls each temperature to the most efficient temperature in the corresponding temperature adjustment range, so that the total efficiency of the power system is at the peak value that can be achieved at present, and achieves the technical effect of improving the overall efficiency of the power system. The specific method is as follows: The first aspect of the present application proposes an embodiment, such as Figure 1 As shown in the step diagram of a temperature control method for a power system, the method is applied to the power system of a vehicle, and is specifically applied to the controller of the power system, and the power system includes a drive motor assembly and a gearbox. The main steps of the method include: Step S101 : acquiring a first influencing parameter of the gearbox on the temperature of the drive motor assembly and a second influencing parameter of the drive motor assembly on the temperature of the gearbox.

[0023] Due to the limited space of the vehicle body, the distance between the gearbox and the drive motor assembly is usually relatively close. Therefore, there will be a certain amount of heat exchange between the gearbox and the drive motor assembly, so that the heat of the gearbox itself will affect the temperature of the drive motor assembly, and the heat of the drive motor assembly itself will also affect the gearbox. Generally speaking, the greater the temperature difference between the gearbox and the drive motor assembly, the greater the impact of each on the other's temperature.

[0024] The first influencing parameter described in this application is a parameter used to evaluate the degree of influence of the heat of the gearbox on the temperature of the drive motor assembly, and the second influencing parameter is a parameter used to evaluate the degree of influence of the heat of the drive motor assembly on the temperature of the gearbox. A larger value of the first influencing parameter indicates a greater degree of influence of the heat of the gearbox on the temperature of the drive motor assembly; a larger value of the second influencing parameter indicates a greater degree of influence of the heat of the drive motor assembly on the temperature of the gearbox.

[0025] In an optional implementation, the drive motor assembly may include a drive motor and a controller of the drive motor. The first influencing parameter may be determined based on the degree of influence of the heat of the gearbox on the drive motor and the controller of the drive motor, respectively.

[0026] In an optional implementation, the first influencing parameter and the second influencing parameter may be preset values ​​pre-set by a technician based on actual experience and stored in a storage module of the power system controller.

[0027] Step S102: determining a first temperature adjustment interval corresponding to the current temperature of the drive motor assembly based on the first influencing parameter, and determining a second temperature adjustment interval corresponding to the current temperature of the gearbox based on the second influencing parameter.

[0028] The first temperature adjustment range refers to the temperature floating range that the drive motor component can reach after temperature adjustment by a temperature adjustment device such as a cooling system based on the current temperature. The second temperature adjustment range refers to the temperature floating range that the gearbox can reach after temperature adjustment by a temperature adjustment device such as a cooling system based on the current temperature.

[0029] In an optional implementation, after obtaining the first influencing parameter, the first temperature adjustment interval can be determined by a preset first correspondence between the first influencing parameter and the first temperature adjustment interval, and after obtaining the second influencing parameter, the second temperature adjustment interval can be determined by a preset second correspondence between the second influencing parameter and the second temperature adjustment interval. The first correspondence and the second correspondence can be a linear correlation or a mapping relationship.

[0030] Step S103: adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjusting the current temperature of the gearbox to a second temperature in the second temperature adjustment interval.

[0031] The first temperature is the temperature when the efficiency of the drive motor assembly is at a peak value, and the second temperature is the temperature when the efficiency of the gearbox is at a peak value.

[0032] The efficiency of the drive motor assembly and the gearbox changes with the change of their temperature, and different temperatures correspond to different efficiencies. Therefore, the drive motor assembly has a first efficiency change interval corresponding to the first temperature adjustment interval, and the gearbox also has a second efficiency change interval corresponding to the second temperature adjustment interval. Among them, there is a one-to-one correspondence between the temperature value in the first temperature adjustment interval and the efficiency value in the first efficiency change interval, and between the temperature value in the second temperature adjustment interval and the efficiency value in the second efficiency change interval.

[0033] In an optional embodiment, the first temperature and the second temperature may be determined before step S103. The steps for determining the first temperature and the second temperature may be the same. Taking the first temperature as an example, the determination process of the first temperature and the second temperature is illustrated. First, according to the relationship between the efficiency of the drive motor assembly and the temperature, the first efficiency change interval corresponding to the first temperature adjustment interval is determined. Subsequently, the efficiency peak value of the drive motor assembly in the interval is determined from the first efficiency change interval, and then the temperature corresponding to the efficiency peak value in the first temperature adjustment interval is determined as the first temperature, and the first temperature can be obtained. Similarly, based on the same technical idea as the first temperature determination process, the second temperature can be determined. The determination process of the second temperature is based on the knowledge of the determination process of the first temperature described in this application by those skilled in the art, combined with relevant technologies, and will not be repeated in this application.

[0034] When the drive motor assembly is at the first temperature and the gearbox is at the second temperature, the efficiency of the drive motor assembly and the gearbox both reach the maximum efficiency that can be achieved currently. Since the total efficiency of the power system is equal to the product of the efficiencies of the various parts, the total efficiency of the power system also reaches the maximum value that can be achieved at this time, so that the power system can always achieve the maximum efficiency that can be achieved currently during the driving process of the vehicle.

[0035] In an optional implementation, the method described in step S101 to step S103 of the present application may be executed periodically during the driving of the vehicle, wherein the execution cycle length may be determined according to the driving condition of the vehicle.

[0036] This embodiment first determines the first temperature adjustment range that can be achieved by the drive motor assembly through the first influencing parameter of the gearbox on the temperature of the drive motor assembly, and determines the second temperature adjustment range that can be achieved by the gearbox through the second influencing parameter of the drive motor assembly on the temperature of the gearbox. After determining the first temperature adjustment range and the second temperature adjustment range, the current temperature of the drive motor assembly is adjusted to the first temperature in the first temperature adjustment range, and the current temperature of the gearbox is adjusted to the second temperature in the second temperature adjustment range. This embodiment first determines the temperature adjustment range that can be achieved by each of the drive motor assembly and the gearbox through the influencing parameters of each other's temperature, and then controls each temperature to the most efficient temperature in the corresponding temperature adjustment range, so that the total efficiency of the power system is at the peak value that can be achieved at present, and achieves the technical effect of improving the overall efficiency of the power system.

[0037] Optionally, refer to Figure 2A method step diagram for determining influencing parameters is shown, wherein obtaining a first influencing parameter of the gearbox on the temperature of the drive motor assembly and a second influencing parameter of the drive motor assembly on the temperature of the gearbox in step S101 specifically includes the following steps: Step S11, obtaining state parameters of the current environment of the drive motor assembly and the gearbox.

[0038] The state parameter includes at least one of temperature, humidity and wind speed.

[0039] Step S12, determining the first influencing parameter based on the state parameter corresponding to the drive motor assembly, and determining the second influencing parameter based on the state parameter corresponding to the gearbox.

[0040] The drive motor assembly and the gearbox affect each other's temperature by absorbing each other's heat or dissipating heat to each other. Therefore, in the process of heat exchange between the drive motor assembly and the gearbox, the heat needs to pass through the environment where the drive motor assembly and the gearbox are located. From this analysis, it can be seen that the amount of heat absorbed by each other or dissipated to each other is not only affected by the temperature of the drive motor assembly and the gearbox assembly themselves, but also determined by the state parameters of the current environment such as temperature, humidity and wind speed. Therefore, the first influencing parameter can be determined based on the state parameters corresponding to the drive motor assembly, and the second influencing parameter can be determined based on the state parameters corresponding to the gearbox.

[0041] In an optional implementation, the temperature in the state parameter may be acquired through a temperature sensor, the humidity in the state parameter may be acquired through a humidity sensor, and the wind speed in the state parameter may be acquired through a wind speed sensor.

[0042] This embodiment determines the first influencing parameter and the second influencing parameter respectively by using the state parameters of the current environments of the driving motor assembly and the gearbox, so that in the process of temperature control of the power system, the influence of the environment on its temperature is also taken into account, thereby improving the accuracy of temperature control of the power system.

[0043] Optionally, refer to Figure 3 A method step diagram for determining the timing of temperature control of a power system is shown, wherein the method further includes the following steps before adjusting the current temperature of the drive motor assembly to the first temperature in the first temperature adjustment interval and adjusting the current temperature of the gearbox to the second temperature in the second temperature adjustment interval in step S103: Step S104, obtaining a target total efficiency, where the target total efficiency includes a maximum total efficiency or a peak total efficiency of the power system.

[0044] The maximum total efficiency is determined based on the maximum efficiency of the drive motor assembly and the maximum efficiency of the gearbox, and the peak total efficiency is determined based on the peak efficiency of the drive motor assembly when the temperature is within the first temperature regulation range and the peak efficiency of the gearbox when the temperature is within the second temperature regulation range.

[0045] Step S105 , determining the current total efficiency of the power system based on the current first efficiency of the drive motor assembly and the current second efficiency of the gearbox.

[0046] When the difference between the current total efficiency and the target total efficiency is greater than a preset threshold, step S103 is executed.

[0047] When the difference between the current total efficiency and the target total efficiency is less than or equal to the preset threshold, the method described in the present application is terminated.

[0048] The target total efficiency includes the maximum total efficiency or peak total efficiency of the power system. The maximum total efficiency of the power system refers to the total efficiency of the power system when the drive motor assembly and the gearbox are at their respective maximum efficiencies. The peak total efficiency of the power system refers to the total efficiency of the power system when the efficiency of the drive motor assembly is at its peak when its temperature is within the first temperature adjustment interval, and the efficiency of the gearbox is at its peak when its temperature is within the second temperature adjustment interval.

[0049] The maximum efficiency of the drive motor assembly and the gearbox respectively refers to the maximum efficiency that the drive motor assembly and the gearbox can achieve on the entire temperature axis.

[0050] For example, refer to Figure 4 A schematic diagram of the relationship curve between the efficiency of a drive motor assembly and a gearbox and the change in temperature is shown. Among them, point A is the maximum efficiency of the gearbox, point B is the most efficient drive motor assembly, point C is the peak efficiency of the gearbox when the temperature is in the second temperature adjustment interval, and point D is the peak efficiency of the drive motor assembly when the temperature is in the first temperature adjustment interval. Therefore, the maximum total efficiency actually refers to the product of the efficiency value corresponding to point A and the efficiency value corresponding to point B, and the peak total efficiency actually refers to the product of the efficiency value corresponding to point C and the efficiency value corresponding to point D.

[0051] In an optional embodiment, the drive motor assembly may include a drive motor and a controller of the drive motor. Figure 5 A schematic diagram of a curve showing the relationship between the efficiency of a drive motor and its controller varying with temperature is shown. The relationship between the efficiency of the drive motor and its controller varying with temperature is the same, but at the same temperature, the efficiency of the drive motor and its controller may be different. Figure 4The curve of the efficiency of the drive motor assembly changing with temperature can be obtained by Figure 5 The efficiency curve of the drive motor changes with temperature, and the efficiency curve of the drive motor controller changes with temperature are synthesized.

[0052] When the difference between the current total efficiency of the power system and the target total efficiency is less than or equal to the preset threshold, it indicates that the temperature adjustment space of the drive motor assembly and the gearbox is small. At this time, in order to reduce the temperature control frequency of the power system, the method described in this application can be directly terminated.

[0053] When the difference between the current total efficiency of the power system and the target total efficiency is greater than a preset threshold, it indicates that the temperature adjustment space of the drive motor assembly and the gearbox is large. At this time, in order to improve the total efficiency of the power system, step S103 can be executed.

[0054] In an optional implementation, the preset threshold may be 0.5%.

[0055] Before executing step S103, this embodiment first determines the size of the temperature adjustment space of the drive motor assembly and the gearbox through the difference between the target total efficiency and the current total efficiency, so that when the temperature adjustment space is small, the power system is not temperature controlled, and control is performed only when the temperature adjustment space is large, thereby reducing the temperature control frequency of the power system and saving energy consumption of the vehicle.

[0056] Optionally, before step S105, the method further includes the following steps: Inputting the current first operating condition parameter of the drive motor assembly into a first efficiency calculation model to obtain the current first efficiency output by the first efficiency calculation model, wherein the first operating condition parameter includes input voltage, input current and temperature; And, inputting the current second operating condition parameters of the gearbox into a second efficiency calculation model to obtain the current second efficiency output by the second efficiency calculation model, wherein the second operating condition parameters include input torque, input speed, oil pan temperature and gear position.

[0057] The first efficiency calculation model includes a derivation relationship between the first operating condition parameter and the first efficiency, and the second efficiency calculation model includes a derivation relationship between the second operating condition parameter and the second efficiency.

[0058] The derivation relationship between the first operating condition parameter and the first efficiency may be a relational expression between the first operating condition parameter and the first efficiency, or a mapping table between the first operating condition parameter and the first efficiency. The first efficiency calculation model may be pre-stored in a storage unit of the power system controller.

[0059] Similarly, the derivation relationship between the second operating condition parameter and the second efficiency may be a relational expression between the second operating condition parameter and the second efficiency, or a mapping table between the second operating condition parameter and the second efficiency. The second efficiency calculation model may be pre-stored in a storage unit of the power system controller.

[0060] In an optional embodiment, the drive motor assembly may include a drive motor and a controller of the drive motor. Correspondingly, the first operating condition parameter may include an input voltage of the drive motor and its controller, an input current of the drive motor and its controller, and a temperature of the drive motor and its controller.

[0061] This embodiment calculates the current first efficiency of the drive motor assembly and the current second efficiency of the gearbox through the first efficiency calculation model and the second efficiency calculation model, which simplifies the efficiency calculation process and improves the temperature control efficiency of the power system.

[0062] Optionally, before inputting the current first operating condition parameter of the drive motor assembly into the first efficiency calculation model and inputting the current second operating condition parameter of the gearbox into the second efficiency calculation model, the method further includes: Acquire a target model, wherein the target model includes the first efficiency calculation model and / or the second efficiency calculation model.

[0063] refer to Figure 6 A method step diagram for obtaining a target model is shown, and the steps of obtaining the target model specifically include the following: Step S21, obtaining parameter samples corresponding to the target model.

[0064] The parameter samples corresponding to the first efficiency calculation model include the plurality of the first operating parameters and the first efficiency corresponding to each of the first operating parameters. The parameter samples corresponding to the second efficiency calculation model include the plurality of the second operating parameters and the second efficiency corresponding to each of the second operating parameters.

[0065] Step S22: establishing an initial target model based on the parameter samples corresponding to the target model.

[0066] Step S23, obtaining test data corresponding to the target model.

[0067] The test data corresponding to the first efficiency calculation model includes the actual efficiency of the drive motor assembly under a plurality of the first operating parameters, and the second efficiency calculation model includes the actual efficiency of the gearbox under a plurality of the second operating parameters.

[0068] Step S24: based on the test data corresponding to the target model, modify the derivation relationship in the initial target model to obtain the target model.

[0069] The target model may be the first efficiency calculation model or the second efficiency calculation model. Accordingly, when the target model is the first efficiency calculation model, the parameter samples corresponding to the target model are the parameter samples corresponding to the first efficiency calculation model, and the test data corresponding to the target model are the test data corresponding to the first efficiency calculation model. When the target model is the second efficiency calculation model, the parameter samples corresponding to the target model are the parameter samples corresponding to the second efficiency calculation model, and the test data corresponding to the target model are the test data corresponding to the second efficiency calculation model.

[0070] Taking the target model as the first efficiency calculation model as an example, steps S21 to S24 are explained by way of example, and the method for obtaining the second efficiency calculation model can be referred to. The multiple first operating condition parameters contained in the parameter sample corresponding to the first efficiency calculation model and the first efficiency corresponding to the multiple first operating condition parameters can be obtained through a theoretical calculation formula. After obtaining the parameter sample corresponding to the first efficiency calculation model, an initial first efficiency calculation model is established through the parameters in the parameter sample to obtain the derivation relationship between the first operating condition parameter and the initial first efficiency. Subsequently, based on the test data corresponding to the first efficiency calculation model, the derivation relationship between the first operating condition parameter and the initial first efficiency is corrected to finally obtain the first efficiency calculation model.

[0071] In this embodiment, when establishing the first efficiency calculation model and the second efficiency calculation model, the initial first efficiency calculation model and the initial second efficiency calculation model are first established based on the parameter sample. Further, based on the test data, the initial model is corrected to obtain the first efficiency calculation model and the second efficiency calculation model, thereby ensuring the high simulation degree of the model and improving the accuracy of determining the first efficiency and the second efficiency.

[0072] Optionally, the power system further comprises a first temperature regulating device for regulating the temperature of the drive motor assembly, and a second temperature regulating device for regulating the temperature of the gearbox. Figure 7 A method for adjusting temperature is shown in the step diagram, wherein the current temperature of the drive motor assembly is adjusted to the first temperature in the first temperature adjustment interval, and the current temperature of the gearbox is adjusted to the second temperature in the second temperature adjustment interval in step S103, specifically including the following steps: Step S31, determining a first temperature control power of the first temperature control device based on the current temperature of the drive motor assembly and the first temperature, and determining a second temperature control power of the second temperature control device based on the current temperature of the gearbox and the second temperature.

[0073] Step S32, controlling the first temperature adjustment device to output the first temperature adjustment power, and controlling the second temperature adjustment device to output the second temperature adjustment power.

[0074] Thermostatic power refers to the power consumed by the thermostatic device to regulate the temperature of the drive motor assembly or the gearbox. Different thermostatic powers will result in different temperature values ​​of the drive motor assembly or the gearbox when the temperature is stable.

[0075] refer to Figure 8 A structural schematic diagram of a first temperature control device and a second temperature control device is shown. In the case where the drive motor assembly includes a drive motor and a controller of the drive motor, the first temperature control device may include a first sub-device for adjusting the temperature of the drive motor, and a second sub-device for adjusting the temperature of the controller of the drive motor. The first sub-device may be a cooling oil pipeline of the drive motor, which adjusts the temperature of the drive motor by directing the cooling oil to the drive motor; the second sub-device may be a cooling water pipeline, which adjusts the temperature of the controller of the drive motor by the cooling water in the cold zone water pipeline. The second temperature control device may be a cooling oil pipeline of a gearbox, which adjusts the temperature of the gearbox by directing the cooling oil to the gearbox. In addition, in order to improve the cooling efficiency of the cooling system, Figure 8 The structure shown in also includes an oil cooling system for cooling the cooling oil. The oil cooling system includes an oil cooler, a vehicle radiator, a cooling fan, a water pump, etc. The pipeline of the oil cooling system contains cooling water. For specific connection relationships, please refer to Figure 8 , this application will not go into details.

[0076] by Figure 8 Taking the structures of the first temperature regulating device and the second temperature regulating device shown as an example, step S31 is explained. The first temperature regulating power should specifically be the target power of the driving pump. Step S31 can be based on the relationship between the current temperature of the driving motor assembly and the first temperature to determine the target power of the driving pump, thereby adjusting the flow rate of the cooling oil. For example, when the current temperature of the driving motor assembly is greater than the first temperature, the target power of the driving pump can be determined to be a value greater than its current power, thereby increasing the flow rate of the cooling oil and reducing the temperature of the driving motor assembly to the first temperature. Similarly, the second temperature regulating power can also be determined in this way, which will not be repeated in this application.

[0077] In an optional embodiment, the second temperature control device may further include a cooling fan and a circulating water pump, and the temperature control power of the second temperature control device includes the power of the cooling fan and the power of the circulating water pump. The greater the second temperature control power, the greater the power of the cooling fan and the circulating water pump; the smaller the second temperature control power, the smaller the power of the cooling fan and the circulating water pump.

[0078] This embodiment adjusts the temperature control power of the temperature control device so that the drive motor assembly and the gearbox reach their respective target temperatures. The temperatures of the drive motor assembly and the gearbox can be controlled during the temperature control process, thereby improving the temperature control efficiency of the power system.

[0079] Optionally, the first temperature regulating device comprises a lubricating oil circuit for lubricating the driving motor assembly. Fig. 9 A method step diagram for determining a first temperature adjustment power is shown, wherein step S31 determines the first temperature adjustment power of the first temperature adjustment device based on the current temperature of the drive motor assembly and the first temperature, specifically comprising the following steps: Step S311, determining a first estimated power based on a difference between the current temperature of the drive motor assembly and the first temperature, and determining whether the current temperature of the drive motor assembly is greater than the first temperature.

[0080] If the current temperature of the driving motor assembly is less than or equal to the first temperature, the process proceeds to step S312 ; if the current temperature of the driving motor assembly is greater than the first temperature, the process proceeds to step S313 .

[0081] Step S312: acquiring a second estimated power, and determining the larger one between the first estimated power and the second estimated power as the first temperature adjustment power.

[0082] The second estimated power is determined based on a lubrication requirement of the drive motor assembly.

[0083] Step S313, obtaining the maximum power and the third estimated power of the first temperature adjustment device, and determining the minimum of the first estimated power, the maximum power and the third estimated power as the first temperature adjustment power.

[0084] The third estimated power is determined based on the acoustic roughness requirement of the vehicle, where acoustic roughness is also called NVH (Noise, Vibration, Harshness).

[0085] The first temperature control device includes a lubricating oil circuit for lubricating the drive motor assembly. The greater the first temperature control power, the greater the lubricating oil flow in the lubricating oil circuit, the higher the heat dissipation efficiency of the drive motor assembly, and the stronger the lubrication ability of the drive motor assembly; the smaller the first temperature control power, the smaller the lubricating oil flow in the lubricating oil circuit, the lower the heat dissipation efficiency of the drive motor assembly, and the weaker the lubrication ability of the drive motor assembly.

[0086] When the difference between the current temperature of the drive motor assembly and the first temperature indicates that the current temperature of the drive motor assembly is greater than the first temperature, the first estimated power should be higher than the current temperature adjustment power of the first temperature adjustment device, thereby increasing the flow of the lubricating oil circuit and reducing the current temperature of the drive motor assembly to the first temperature. At the same time, the greater the absolute value of the difference, the greater the first estimated power.

[0087] Similarly, when the difference between the current temperature of the drive motor assembly and the first temperature indicates that the current temperature of the drive motor assembly is less than or equal to the first temperature, the first estimated power should be lower than the current temperature adjustment power of the first temperature adjustment device, thereby reducing the flow of the lubricating oil circuit and raising the current temperature of the drive motor assembly to the first temperature. At the same time, the larger the absolute value of the difference, the smaller the first estimated power.

[0088] The current temperature of the drive motor assembly is less than or equal to the first temperature, indicating that the first temperature control device should reduce its temperature control power. At this time, since the lubricating oil circuit in the first temperature control device is not only used to adjust the temperature of the drive motor assembly, but also to achieve the lubrication of the drive motor assembly. Therefore, in order to avoid the situation where the drive motor assembly is insufficiently lubricated after the temperature control power of the first temperature control device decreases, the lubrication demand of the drive motor assembly should also be considered. Specifically, the larger of the second estimated power and the first estimated power is determined as the first temperature control power. In an optional embodiment, the second estimated power can increase with the increase of the lubrication demand of the drive motor assembly.

[0089] The current temperature of the drive motor assembly is greater than the first temperature, indicating that the first temperature control device should increase its temperature control power. At this time, the change in the temperature control power of the first temperature control device will also cause a change in the acoustic roughness of the vehicle. Therefore, in order to avoid abnormal noise or abnormal vibration of the drive motor assembly after the temperature control power of the first temperature control device increases, the acoustic roughness requirement of the drive motor assembly should also be considered. Specifically, the minimum of the maximum power of the first temperature control device, the third estimated power, and the first estimated power is determined as the first temperature control power. In an optional embodiment, the third estimated power can decrease as the acoustic roughness requirement of the vehicle increases.

[0090] In this embodiment, when the first temperature control device includes a lubrication oil circuit, the lubrication requirements of the drive motor assembly and the acoustic roughness requirements of the vehicle are taken into consideration together, thereby avoiding abnormal wear or vibration of the vehicle after the temperature control power of the first temperature control device is adjusted, thereby increasing the service life of the vehicle.

[0091] Based on the above embodiments, reference Fig.10 A flow chart of a temperature control method for a power system is shown. The temperature control method for the power system described in this application will be exemplarily described below: The temperature control method of the power system described in the present application is applied to the power system of a vehicle, and is specifically applied to the controller of the power system. The power system includes a drive motor assembly, a gearbox, a first temperature control device, and a second temperature control device. The first temperature control device is used to adjust the temperature of the drive motor assembly, and the second temperature control device is used to adjust the temperature of the gearbox.

[0092] The controller of the power system includes a storage module, in which a first efficiency calculation model and a second efficiency calculation model are stored. The first efficiency calculation model includes a derivation relationship between a first operating parameter of a drive motor assembly and a first efficiency, and the second efficiency calculation model includes a derivation relationship between a second operating parameter of a gearbox and a second efficiency.

[0093] The first efficiency calculation model and the second efficiency calculation model can be obtained by the following steps, specifically including: First, parameter samples corresponding to the first efficiency calculation model and the second efficiency calculation model are obtained. The parameter samples corresponding to the first efficiency calculation model include a plurality of first operating parameters and a first efficiency corresponding to each first operating parameter, and the parameter samples corresponding to the second efficiency calculation model include a plurality of second operating parameters and a second efficiency corresponding to each second operating parameter.

[0094] Subsequently, an initial first efficiency calculation model is established based on the parameter samples corresponding to the first efficiency calculation model, and an initial second efficiency calculation model is established based on the parameter samples corresponding to the second efficiency calculation model.

[0095] After obtaining the initial first efficiency calculation model and the initial second efficiency calculation model, the test data corresponding to the first efficiency calculation model and the second efficiency calculation model are obtained, wherein the test data corresponding to the first efficiency calculation model includes the actual efficiency of the drive motor assembly under a plurality of first operating parameters, and the test data corresponding to the second efficiency calculation model includes the actual efficiency of the gearbox under a plurality of second operating parameters.

[0096] Finally, based on the test data corresponding to the first efficiency calculation model, the initial first efficiency calculation model is corrected to obtain the first efficiency calculation model. And based on the test data corresponding to the second efficiency calculation model, the initial second efficiency calculation model is corrected to obtain the second efficiency calculation model.

[0097] The method described in this application specifically includes the following steps: At the beginning of the method, state parameters of the current environment of the drive motor assembly and the gearbox are obtained, as well as the current temperature of the drive motor assembly and the gearbox. Subsequently, a first influencing parameter is determined based on the state parameters corresponding to the drive motor assembly, and a second influencing parameter is determined based on the state parameters corresponding to the gearbox.

[0098] After obtaining the first influencing parameter and the second influencing parameter, a first temperature adjustment interval corresponding to the current temperature of the drive motor assembly is determined based on the first influencing parameter, and a second temperature adjustment interval corresponding to the current temperature of the gearbox is determined based on the second influencing parameter.

[0099] After that, the current first operating condition parameter of the drive motor assembly is input into the first efficiency calculation model to obtain the current first efficiency output by the first efficiency calculation model. Also, the current second operating condition parameter of the gearbox is input into the second efficiency calculation model to obtain the current second efficiency output by the second efficiency calculation model. Further, based on the current first efficiency of the drive motor assembly and the current second efficiency of the gearbox, the current total efficiency of the power system is determined.

[0100] After obtaining the current total efficiency of the power system, determine whether the difference between the current total efficiency and the target total efficiency is greater than a preset threshold. If the difference between the current total efficiency and the target total efficiency is greater than the preset threshold, determine the first temperature control power of the first temperature control device based on the current temperature of the drive motor component and the first temperature, and determine the second temperature control power of the second temperature control device based on the current temperature of the gearbox and the second temperature. Finally, control the first temperature control device to output the first temperature control power, and control the second temperature control device to output the second temperature control power.

[0101] If the difference between the current total efficiency and the target total efficiency is less than or equal to the preset threshold, the method of the present application is terminated.

[0102] In addition, when the first temperature control device includes a lubricating oil circuit for lubricating the drive motor assembly, the method described in the present application can also determine the first temperature control power through the following steps. Specifically, based on the difference between the current temperature of the drive motor assembly and the first temperature, determine the first estimated power, and determine whether the current temperature of the drive motor assembly is greater than the first temperature.

[0103] If the current temperature of the drive motor assembly is less than or equal to the first temperature, the second estimated power is obtained, and the larger of the first estimated power and the second estimated power is determined as the first temperature adjustment power. The second estimated power is determined based on the lubrication requirement of the drive motor assembly.

[0104] If the current temperature of the drive motor assembly is greater than the first temperature, the maximum power and the third estimated power of the first temperature regulating device are obtained, and the minimum of the first estimated power, the maximum power and the third estimated power is determined as the first temperature regulating power. The third estimated power is determined based on the acoustic roughness requirement of the vehicle.

[0105] Based on the same inventive concept, the present application also provides a temperature control system for a power system, wherein the power system includes a drive motor assembly and a gearbox, such as Fig.11 As shown in the structural schematic diagram of a temperature control system of a power system, the temperature control system includes: An acquisition module, used to acquire a first influence parameter of the gearbox on the temperature of the drive motor assembly, and a second influence parameter of the drive motor assembly on the temperature of the gearbox; a determination module, configured to determine a first temperature adjustment interval corresponding to a current temperature of the drive motor assembly based on the first influencing parameter, and to determine a second temperature adjustment interval corresponding to a current temperature of the gearbox based on the second influencing parameter; an execution module, configured to adjust the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjust the current temperature of the gearbox to a second temperature in the second temperature adjustment interval; The first temperature is the temperature when the efficiency of the drive motor assembly is at a peak value, and the second temperature is the temperature when the efficiency of the gearbox is at a peak value.

[0106] Optionally, the acquisition module is also used to obtain state parameters of the current environment of the drive motor assembly and the gearbox, wherein the state parameters include at least one of temperature, humidity and wind speed; determine the first influencing parameter based on the state parameters corresponding to the drive motor assembly, and determine the second influencing parameter based on the state parameters corresponding to the gearbox.

[0107] Optionally, the execution module is also used to obtain a target total efficiency, the target total efficiency including a maximum total efficiency or a peak total efficiency of the power system, the maximum total efficiency being determined based on a maximum efficiency of the drive motor assembly and a maximum efficiency of the gearbox, and the peak total efficiency being determined based on a peak efficiency of the drive motor assembly when the temperature is within the first temperature adjustment interval and a peak efficiency of the gearbox when the temperature is within the second temperature adjustment interval; determining a current total efficiency of the power system based on a current first efficiency of the drive motor assembly and a current second efficiency of the gearbox; and adjusting a current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjusting a current temperature of the gearbox to a second temperature in the second temperature adjustment interval when a difference between the current total efficiency and the target total efficiency is greater than a preset threshold.

[0108] Optionally, the execution module is also used to input the current first operating condition parameter of the drive motor assembly into a first efficiency calculation model to obtain the current first efficiency output by the first efficiency calculation model before determining the current total efficiency of the power system based on the current first efficiency of the drive motor assembly and the current second efficiency of the gearbox, the first operating condition parameter including input voltage, input current and temperature; and input the current second operating condition parameter of the gearbox into a second efficiency calculation model to obtain the current second efficiency output by the second efficiency calculation model, the second operating condition parameter including input torque, input speed, oil pan temperature and gear position; wherein the first efficiency calculation model includes a derivation relationship between the first operating condition parameter and the first efficiency, and the second efficiency calculation model includes a derivation relationship between the second operating condition parameter and the second efficiency.

[0109] Optionally, the execution module is also used to obtain a target model before inputting the current first operating condition parameters of the drive motor assembly into the first efficiency calculation model and inputting the current second operating condition parameters of the gearbox into the second efficiency calculation model, and the target model includes the first efficiency calculation model and / or the second efficiency calculation model.

[0110] The step of obtaining the target model comprises: Acquire parameter samples corresponding to the target model, wherein the parameter samples corresponding to the first efficiency calculation model include the multiple first operating parameters and the first efficiency corresponding to each of the first operating parameters, and the parameter samples corresponding to the second efficiency calculation model include the multiple second operating parameters and the second efficiency corresponding to each of the second operating parameters; establish an initial target model based on the parameter samples corresponding to the target model; acquire test data corresponding to the target model, wherein the test data corresponding to the first efficiency calculation model includes the actual efficiency of the drive motor assembly under the multiple first operating parameters, and the test data corresponding to the second efficiency calculation model includes the actual efficiency of the gearbox under the multiple second operating parameters; based on the test data corresponding to the target model, correct the derivation relationship in the initial target model to obtain the target model.

[0111] Optionally, the power system also includes a first temperature control device for adjusting the temperature of the drive motor assembly, and a second temperature control device for adjusting the temperature of the gearbox. The execution module is further used to determine a first temperature control power of the first temperature control device based on the current temperature of the drive motor assembly and the first temperature, and to determine a second temperature control power of the second temperature control device based on the current temperature of the gearbox and the second temperature; control the first temperature control device to output the first temperature control power, and control the second temperature control device to output the second temperature control power.

[0112] Optionally, the execution module is also used to determine a first estimated power based on the difference between the current temperature of the drive motor assembly and the first temperature, and to determine whether the current temperature of the drive motor assembly is greater than the first temperature; if not, obtain a second estimated power, and determine the larger of the first estimated power and the second estimated power as the first temperature control power, and the second estimated power is determined based on the lubrication requirement of the drive motor assembly; if so, obtain the maximum power and a third estimated power of the first temperature control device, and determine the minimum of the first estimated power, the maximum power and the third estimated power as the first temperature control power, and the third estimated power is determined based on the acoustic roughness requirement of the vehicle.

[0113] An embodiment of the present application also provides a computer-readable storage medium on which a computer program / instruction is stored. When the computer program / instruction is executed by a processor, a temperature control method of a power system as disclosed in an embodiment of the present application is implemented.

[0114] An embodiment of the present application also provides a vehicle, including a temperature control system of a power system provided in the present application, or including a control module, wherein the control module is used to implement the steps of the temperature control method of the power system described in the embodiment of the present application.

[0115] The present application provides a temperature control method, system, storage medium and vehicle for a power system, the method comprising: obtaining a first influencing parameter of the gearbox on the temperature of the drive motor assembly, and a second influencing parameter of the drive motor assembly on the temperature of the gearbox; determining a first temperature adjustment interval corresponding to the current temperature of the drive motor assembly based on the first influencing parameter, and determining a second temperature adjustment interval corresponding to the current temperature of the gearbox based on the second influencing parameter; adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjusting the current temperature of the gearbox to a second temperature in the second temperature adjustment interval; wherein the first temperature is the temperature when the efficiency of the drive motor assembly is at its peak, and the second temperature is the temperature when the efficiency of the gearbox is at its peak.

[0116] The present application first determines the first temperature adjustment interval that can be achieved by the drive motor assembly through the first influencing parameter of the gearbox on the temperature of the drive motor assembly, and determines the second temperature adjustment interval that can be achieved by the gearbox through the second influencing parameter of the drive motor assembly on the temperature of the gearbox. After determining the first temperature adjustment interval and the second temperature adjustment interval, the current temperature of the drive motor assembly is adjusted to the first temperature in the first temperature adjustment interval, and the current temperature of the gearbox is adjusted to the second temperature in the second temperature adjustment interval. The present application first determines the temperature adjustment interval that can be achieved by each of the drive motor assembly and the gearbox through the influencing parameters of each other's temperature, and then controls each temperature to the most efficient temperature in the corresponding temperature adjustment interval, so that the total efficiency of the power system is at the peak value that can be achieved at present, and achieves the technical effect of improving the overall efficiency of the power system.

[0117] The various embodiments in this specification are described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the various embodiments can be referenced to each other.

[0118] The embodiments of the present application are described with reference to the flowcharts and / or block diagrams of the methods, systems, electronic devices, and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing terminal device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing terminal device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0119] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing terminal device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce a manufactured product including an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0120] These computer program instructions can also be loaded onto a computer or other programmable data processing terminal device so that a series of operating steps are executed on the computer or other programmable terminal device to produce a computer-implemented process, thereby providing instructions for executing on the computer or other programmable terminal device to implement the process. Figure 1A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0121] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the embodiments of the present application.

[0122] Finally, it should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or terminal device 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 terminal device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or terminal device including the elements.

[0123] The above is a detailed introduction to the temperature control method, system, storage medium and vehicle of a power system provided by the present application. Specific examples are used in this article to illustrate the principles and implementation methods of the present application. The description of the above embodiments is only used to help understand the method of the present application and its core idea; at the same time, for general technical personnel in this field, according to the idea of ​​the present application, there will be changes in the specific implementation method and application scope. In summary, the content of this specification should not be understood as a limitation on the present application.

Claims

1. A temperature control method for a power system, characterized in that: The power system includes a drive motor assembly and a gearbox, and the method includes: Acquire a first influencing parameter of the gearbox on the temperature of the drive motor assembly, and a second influencing parameter of the drive motor assembly on the temperature of the gearbox; Determine a first temperature adjustment interval corresponding to the current temperature of the drive motor assembly based on the first influencing parameter, and determine a second temperature adjustment interval corresponding to the current temperature of the gearbox based on the second influencing parameter; Adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjusting the current temperature of the gearbox to a second temperature in the second temperature adjustment interval; The first temperature is the temperature when the efficiency of the drive motor assembly is at a peak value, and the second temperature is the temperature when the efficiency of the gearbox is at a peak value.

2. The temperature control method of the power system according to claim 1, characterized in that: The obtaining of a first influence parameter of the gearbox on the temperature of the drive motor assembly, and a second influence parameter of the drive motor assembly on the temperature of the gearbox, comprises: Acquire state parameters of the current environment of the drive motor assembly and the gearbox, wherein the state parameters include at least one of temperature, humidity and wind speed; The first influencing parameter is determined based on the state parameter corresponding to the driving motor assembly, and the second influencing parameter is determined based on the state parameter corresponding to the gearbox.

3. The temperature control method of the power system according to claim 1, characterized in that: Before adjusting the current temperature of the drive motor assembly to the first temperature in the first temperature adjustment interval and adjusting the current temperature of the gearbox to the second temperature in the second temperature adjustment interval, the method further includes: Obtaining a target total efficiency, the target total efficiency comprising a maximum total efficiency or a peak total efficiency of the power system, the maximum total efficiency being determined based on a maximum efficiency of the drive motor assembly and a maximum efficiency of the gearbox, the peak total efficiency being determined based on a peak efficiency of the drive motor assembly when the temperature is within the first temperature adjustment interval, and a peak efficiency of the gearbox when the temperature is within the second temperature adjustment interval; determining a current overall efficiency of the powertrain system based on a current first efficiency of the drive motor assembly and a current second efficiency of the gearbox; The step of adjusting the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjusting the current temperature of the gearbox to a second temperature in the second temperature adjustment interval, comprises: When the difference between the current total efficiency and the target total efficiency is greater than a preset threshold, the current temperature of the drive motor assembly is adjusted to a first temperature in the first temperature adjustment interval, and the current temperature of the gearbox is adjusted to a second temperature in the second temperature adjustment interval.

4. The temperature control method of the power system according to claim 3, characterized in that: Before determining the current total efficiency of the power system based on the current first efficiency of the drive motor assembly and the current second efficiency of the gearbox, the method further includes: Inputting the current first operating condition parameters of the drive motor assembly into a first efficiency calculation model to obtain the current first efficiency output by the first efficiency calculation model, wherein the first operating condition parameters include input voltage, input current and temperature; and inputting a current second operating condition parameter of the gearbox into a second efficiency calculation model to obtain the current second efficiency output by the second efficiency calculation model, wherein the second operating condition parameter includes input torque, input speed, oil sump temperature, and gear position; The first efficiency calculation model includes a derivation relationship between the first operating condition parameter and the first efficiency, and the second efficiency calculation model includes a derivation relationship between the second operating condition parameter and the second efficiency.

5. The temperature control method of the power system according to claim 4, characterized in that: Before inputting the current first operating condition parameter of the drive motor assembly into the first efficiency calculation model and inputting the current second operating condition parameter of the gearbox into the second efficiency calculation model, the method further includes: Acquire a target model, where the target model includes the first efficiency calculation model and / or the second efficiency calculation model; The step of obtaining the target model comprises: Acquire parameter samples corresponding to the target model, wherein the parameter samples corresponding to the first efficiency calculation model include the plurality of first operating parameters and the first efficiencies corresponding to the first operating parameters, and the parameter samples corresponding to the second efficiency calculation model include the plurality of second operating parameters and the second efficiencies corresponding to the second operating parameters; Establishing an initial target model based on the parameter samples corresponding to the target model; Acquire test data corresponding to the target model, wherein the test data corresponding to the first efficiency calculation model includes the actual efficiency of the drive motor assembly under a plurality of the first operating parameters, and the test data corresponding to the second efficiency calculation model includes the actual efficiency of the gearbox under a plurality of the second operating parameters; Based on the test data corresponding to the target model, the derivation relationship in the initial target model is modified to obtain the target model.

6. The temperature control method of a power system according to claim 1, characterized in that: The power system further includes a first temperature regulating device for regulating the temperature of the drive motor assembly, and a second temperature regulating device for regulating the temperature of the gearbox, wherein the current temperature of the drive motor assembly is adjusted to a first temperature in the first temperature regulating interval, and the current temperature of the gearbox is adjusted to a second temperature in the second temperature regulating interval, including: Determining a first temperature adjustment power of the first temperature adjustment device based on the current temperature of the drive motor assembly and the first temperature, and determining a second temperature adjustment power of the second temperature adjustment device based on the current temperature of the gearbox and the second temperature; The first temperature regulating device is controlled to output the first temperature regulating power, and the second temperature regulating device is controlled to output the second temperature regulating power.

7. The temperature control method of the power system according to claim 6, characterized in that: The first temperature regulating device includes a lubricating oil circuit for lubricating the drive motor assembly, and determining a first temperature regulating power of the first temperature regulating device based on a current temperature of the drive motor assembly and the first temperature includes: Determining a first estimated power based on a difference between a current temperature of the drive motor assembly and the first temperature, and determining whether the current temperature of the drive motor assembly is greater than the first temperature; If not, obtaining a second estimated power, and determining the larger of the first estimated power and the second estimated power as the first temperature adjustment power, wherein the second estimated power is determined based on the lubrication requirement of the drive motor assembly; If so, the maximum power and the third estimated power of the first temperature control device are obtained, and the minimum of the first estimated power, the maximum power and the third estimated power is determined as the first temperature control power, and the third estimated power is determined based on the acoustic roughness requirement of the vehicle.

8. A temperature control system for a power system, characterized in that: The power system includes a drive motor assembly and a gearbox, and the temperature control system includes: An acquisition module, used to acquire a first influence parameter of the gearbox on the temperature of the drive motor assembly, and a second influence parameter of the drive motor assembly on the temperature of the gearbox; a determination module, configured to determine a first temperature adjustment interval corresponding to a current temperature of the drive motor assembly based on the first influencing parameter, and to determine a second temperature adjustment interval corresponding to a current temperature of the gearbox based on the second influencing parameter; an execution module, configured to adjust the current temperature of the drive motor assembly to a first temperature in the first temperature adjustment interval, and adjust the current temperature of the gearbox to a second temperature in the second temperature adjustment interval; The first temperature is the temperature when the efficiency of the drive motor assembly is at a peak value, and the second temperature is the temperature when the efficiency of the gearbox is at a peak value.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the program is executed by a processor, the steps of the temperature control method of a power system according to any one of claims 1 to 7 are implemented.

10. A vehicle, characterized in that: A temperature control system comprising the power system as claimed in claim 8, or a control module, wherein the control module is used to implement the steps of the temperature control method for the power system as claimed in any one of claims 1-7.

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