Motor cooling control method and apparatus, device, and storage medium

Abstract

The present application discloses a motor cooling control method and apparatus, a device, and a storage medium. The method comprises: on the basis of the torque of a motor and the rotation speed of the motor, determining target heat dissipation power; on the basis of a current oil-water temperature difference and the target heat dissipation power, determining a contour line corresponding to the target heat dissipation power, the contour line being used for representing the target heat dissipation power at different oil flow rates and different water flow rates; on the basis of the contour line, determining an amount of change in the water flow rate corresponding to a current oil flow rate and an amount of change in the oil flow rate corresponding to a current water flow rate; on the basis of the smaller of the amount of change in the water flow rate and the amount of change in the oil flow rate, determining a target oil flow rate and a target water flow rate; and on the basis of the target oil flow rate, controlling the rotation speed or the duty ratio of an electronic oil pump, and on the basis of the target water flow rate, controlling the rotation speed or the duty ratio of an electronic water pump. By means of the above solution, the oil-water temperature difference, the oil flow rate, and the water flow rate can be finely controlled, so that the heat dissipation power meets the cooling requirements of the motor, and precise heat dissipation according to requirements is achieved, thereby reducing the power consumption of an electric driving system and an entire vehicle.

Description

Motor cooling control method, device, equipment and storage medium Technical Field

[0001] The present application belongs to the field of vehicle control technology, and in particular relates to a motor cooling control method, device, equipment and storage medium. Background Art

[0002] In hybrid and pure electric vehicles, an oil-water heat exchanger is typically used to transfer heat from the electric drive cooling oil to the cooling water. Heat is then dissipated into the air through the heat exchanger's heat dissipation components, thereby cooling the cooling oil. The basic characteristics of a heat exchanger are: given a certain specific heat capacity, the greater the temperature difference between the oil and water, the greater its heat dissipation efficiency—that is, its heat dissipation capacity. Given a certain oil-water temperature difference, the greater the oil flow rate and / or water flow rate, the greater the heat dissipation efficiency. Therefore, in addition to the specific heat capacity of the heat exchanger itself, the main factors affecting its heat dissipation efficiency are the oil-water temperature difference, the oil flow rate, and the water flow rate.

[0003] How to precisely control the oil-water temperature difference, oil flow rate and water flow rate so that the heat exchanger's heat dissipation power meets the cooling needs of the motor and achieves precise heat dissipation on demand is an urgent problem that needs to be solved.

[0004] Summary of the Invention

[0005] The embodiments of the present application provide a motor cooling control method, device, equipment and storage medium, which can finely control the oil-water temperature difference, oil flow and water flow, so that the heat dissipation power of the heat exchanger meets the cooling requirements of the motor, and achieves precise heat dissipation on demand, thereby reducing the power consumption of the electric drive system and the entire vehicle.

[0006] Other features and advantages of the present application will become apparent from the following detailed description, or may be learned in part by practice of the present application.

[0007] According to a first aspect of an embodiment of the present application, a motor cooling control method is provided, comprising:

[0008] Determine the target heat dissipation power based on the motor torque and motor speed;

[0009] Determining, based on the current oil-water temperature difference and the target heat dissipation power, an isoline corresponding to the target heat dissipation power, wherein the isoline is used to represent the target heat dissipation power under different oil flow rates and different water flow rates;

[0010] Determine, based on the contour lines, a change in water flow corresponding to the current oil flow and a change in oil flow corresponding to the current water flow;

[0011] determining a target oil flow rate and a target water flow rate according to the smaller of the water flow rate change and the oil flow rate change;

[0012] The speed or duty cycle of the electronic oil pump is controlled according to the target oil flow rate, and the speed or duty cycle of the electronic water pump is controlled according to the target water flow rate.

[0013] In some embodiments of the present application, based on the aforementioned solution, determining the contour line corresponding to the target heat dissipation power according to the current oil-water temperature difference and the target heat dissipation power includes:

[0014] determining a first distribution map corresponding to the current oil-water temperature difference, wherein the first distribution map is used to characterize heat dissipation power under different oil flow rates and different water flow rates;

[0015] The heat dissipation power in the first distribution diagram and the target heat dissipation power are interpolated to obtain a contour line corresponding to the target heat dissipation power.

[0016] In some embodiments of the present application, based on the above solution, determining the first distribution map corresponding to the current oil-water temperature difference includes:

[0017] Acquire a second distribution map, the second distribution map including a plurality of first distribution maps corresponding to preset oil-water temperature differences;

[0018] When the current oil-water temperature difference is greater than the current preset oil-water temperature difference, the first distribution map corresponding to the next preset oil-water temperature difference is determined as the first distribution map corresponding to the current oil-water temperature difference.

[0019] In some embodiments of the present application, based on the aforementioned solution, determining, according to the contour lines, the water flow change corresponding to the current oil flow and the oil flow change corresponding to the current water flow, includes:

[0020] Determining the water flow corresponding to the current oil flow and the oil flow corresponding to the current water flow according to the contour lines;

[0021] determining the difference between the water flow corresponding to the current oil flow and the current water flow as the water flow change;

[0022] The difference between the oil flow corresponding to the current water flow and the current oil flow is determined as the oil flow change.

[0023] In some embodiments of the present application, based on the aforementioned solution, determining the target oil flow rate and the target water flow rate according to the smaller of the water flow rate change and the oil flow rate change includes:

[0024] When the oil flow rate change is less than or equal to the water flow rate change, the current water flow rate is determined as the target water flow rate, and the sum of the oil flow rate change and the current oil flow rate is determined as the target oil flow rate;

[0025] When the oil flow rate change is greater than the water flow rate change, the current oil flow rate is determined as the target oil flow rate, and the sum of the water flow rate change and the current water flow rate is determined as the target water flow rate.

[0026] In some embodiments of the present application, based on the aforementioned solution, determining the target heat dissipation power according to the motor torque and the motor speed includes:

[0027] The target heat dissipation power is searched in a preset mapping table according to the motor torque and the motor speed, where the preset mapping table is used to represent a correspondence between the motor torque, the motor speed and the target heat dissipation power.

[0028] In some embodiments of the present application, based on the aforementioned solution, controlling the speed or duty cycle of the electronic oil pump according to the target oil flow rate includes:

[0029] determining a target speed of the electronic oil pump according to the target oil flow rate and the displacement of the electronic oil pump, and controlling the electronic oil pump to operate at the target speed;

[0030] Alternatively, the target duty cycle of the electronic oil pump is determined from a duty cycle and flow relationship table of the electronic oil pump according to the target oil flow, and the electronic oil pump is controlled to operate according to the target duty cycle.

[0031] According to a second aspect of an embodiment of the present application, a motor cooling control device is provided, comprising:

[0032] a target heat dissipation power determination unit, configured to determine the target heat dissipation power according to the motor torque and the motor speed;

[0033] a contour line determining unit configured to determine, based on a current oil-water temperature difference and the target heat dissipation power, a contour line corresponding to the target heat dissipation power, the contour line being used to represent the target heat dissipation power under different oil flow rates and different water flow rates;

[0034] a flow rate change determination unit configured to determine, based on the contour lines, a water flow rate change corresponding to a current oil flow rate and an oil flow rate change corresponding to a current water flow rate;

[0035] a target flow rate determination unit configured to determine a target oil flow rate and a target water flow rate according to the smaller of the water flow rate change and the oil flow rate change;

[0036] The flow control unit is configured to control the rotation speed or duty cycle of the electronic oil pump according to the target oil flow rate, and to control the rotation speed or duty cycle of the electronic water pump according to the target water flow rate.

[0037] According to a third aspect of an embodiment of the present application, a motor cooling control device is provided, comprising a processor and a memory, wherein the memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method described in any one of the first aspects above are implemented.

[0038] According to a fourth aspect of an embodiment of the present application, a computer-readable storage medium is provided, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method described in any one of the first aspects above.

[0039] In this application, the target heat dissipation power is determined according to the motor torque and motor speed; the contour line corresponding to the target heat dissipation power is determined according to the current oil-water temperature difference and the target heat dissipation power, and the contour line is used to characterize the target heat dissipation power under different oil flow rates and different water flow rates; the water flow change corresponding to the current oil flow rate and the oil flow change corresponding to the current water flow rate are determined according to the contour line; the target oil flow rate and the target water flow rate are determined according to the smaller of the water flow change and the oil flow change; the speed or duty cycle of the electronic oil pump is controlled according to the target oil flow rate, and the speed or duty cycle of the electronic water pump is controlled according to the target water flow rate. The above scheme can finely control the oil-water temperature difference, oil flow rate and water flow rate, so that the heat dissipation power meets the cooling requirements of the motor, and achieves precise heat dissipation on demand, thereby reducing the power consumption of the electric drive system and the entire vehicle.

[0040] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The accompanying drawings are incorporated into and constitute a part of the specification, illustrating embodiments consistent with the present application and, together with the specification, serving to explain the principles of the present application. It is obvious that the drawings described below are merely some embodiments of the present application, and a person skilled in the art can derive other drawings based on these drawings without inventive effort. In the drawings:

[0042] FIG1 is a schematic diagram showing the principle of a motor cooling control method according to an embodiment;

[0043] FIG2 is a schematic flow chart of a motor cooling control method according to an embodiment;

[0044] FIG3 shows a schematic diagram of a second distribution diagram in one embodiment;

[0045] FIG4 shows a schematic diagram of contour lines in one embodiment;

[0046] FIG5 shows a block diagram of a motor cooling control device according to an embodiment;

[0047] FIG6 shows a schematic structural diagram of a motor cooling control device in one embodiment. DETAILED DESCRIPTION

[0048] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0049] In addition, described feature, structure or characteristic can be combined in one or more embodiments in any suitable manner.In the following description, many specific details are provided so as to provide a full understanding of the embodiments of the present application. However, it will be appreciated by those skilled in the art that the technical scheme of the present application can be put into practice without one or more of the specific details, or other methods, components, devices, steps etc. can be adopted. In other cases, known methods, devices, implementations or operations are not shown or described in detail to avoid blurring the various aspects of the application.

[0050] The block diagrams shown in the accompanying drawings are merely functional entities and do not necessarily correspond to physically separate entities. That is, these functional entities may be implemented in software, in one or more hardware modules or integrated circuits, or in different networks and / or processor devices and / or microcontroller devices.

[0051] The flowcharts shown in the accompanying drawings are for illustrative purposes only and do not necessarily include all contents and operations / steps, nor must they be executed in the order described. For example, some operations / steps may be decomposed, while others may be combined or partially combined. Therefore, the actual execution order may vary depending on the actual situation.

[0052] In order to enable those skilled in the art to better understand the present application, the working principle of the motor cooling control system involved in the present application is first briefly described with reference to FIG1 .

[0053] 1 , which shows a schematic diagram of the principle of a motor cooling control method applicable to an embodiment of the present application. The schematic diagram shown in FIG1 is divided into a water flow cycle, an oil flow cycle, and a control flow.

[0054] The cooling water passes through an electronic water pump, a degassing chamber, an oil-water heat exchanger, a radiator (such as fan cooling), an electronic water pump, etc. to form a water flow cycle. A temperature sensor is provided in the water flow cycle to monitor the water temperature.

[0055] The motor's cooling oil passes through the oil pan, filter, electronic oil pump, oil-water heat exchanger, drive motor, oil pan... to form an oil flow circulation. A temperature sensor is provided in the oil flow circulation to monitor the oil temperature. Part of the oil also passes through the oil distribution channel to meet other needs (such as bearing lubrication) and then returns to the oil pan.

[0056] In the control flow, the MTCU (Motor and Transmission Control Unit) collects information such as water flow, oil flow, water temperature, oil temperature, torque, and speed. The motor torque-speed-thermal power consumption distribution diagram can be checked according to the torque and speed to obtain the motor thermal power consumption, that is, the target heat dissipation power. The oil-water temperature difference-oil flow-water flow-heat dissipation power distribution diagram can be checked according to the water flow, oil flow, water temperature, and oil temperature to obtain the target speed or target duty cycle of the electronic water pump and electronic oil pump, and finally control the electronic water pump and electronic oil pump to operate at the target speed or target duty cycle.

[0057] As shown in FIG2 , a motor cooling control method is provided. The method is described by taking the application of the method to the MTCU in FIG1 as an example. The method may include the following steps 201 to 205 .

[0058] In step 201 , a target heat dissipation power is determined according to the motor torque and the motor speed.

[0059] It is understandable that in the hybrid electric drive system and the pure electric drive system, the cooling oil needs to be cooled by an oil-water heat exchanger. Therefore, the target heat dissipation power is the target heat dissipation power of the oil-water heat exchanger.

[0060] During implementation, the target heat dissipation power can be determined in a variety of ways.

[0061] In some embodiments, the target heat dissipation power may be searched in a preset mapping table according to the motor torque and the motor speed. The preset mapping table is used to characterize the correspondence between the motor torque, the motor speed and the target heat dissipation power.

[0062] In other embodiments, the target heat dissipation power can also be obtained by calculation. Specifically, the motor working efficiency under the motor speed and motor torque (the motor working efficiency is a percentage less than 100%), as well as the voltage and current data under the motor speed and motor torque can be obtained. When the motor is driven, the product of the voltage and the current is used as the input electric power, and the input electric power is subtracted from the product of the electric power and the motor working efficiency (i.e., the output mechanical work power) to obtain the motor power consumption, i.e., the target heat dissipation power; when the motor generates electricity, the motor speed is multiplied by the motor torque and then divided by 9550 to obtain the input mechanical power, and the input mechanical power is subtracted from the product of the mechanical power and the motor working efficiency (i.e., the output power generation power) to obtain the motor power consumption, i.e., the target heat dissipation power.

[0063] In step 202, the contour lines corresponding to the target heat dissipation power are determined according to the current oil-water temperature difference and the target heat dissipation power. The contour lines are used to represent the target heat dissipation power under different oil flow rates and different water flow rates.

[0064] It is understandable that the current oil temperature and the current water temperature can be measured by the temperature sensor, and the current oil temperature minus the current water temperature can be used to obtain the current oil-water temperature difference.

[0065] During the implementation process, a first distribution map corresponding to the current oil-water temperature difference is determined, and the first distribution map is used to characterize the heat dissipation power under different oil flow rates and different water flow rates; the heat dissipation power in the first distribution map and the target heat dissipation power are interpolated to obtain the contour line corresponding to the target heat dissipation power.

[0066] Among them, the first distribution map can be an oil-water temperature difference-oil flow-water flow-heat dissipation power distribution map, and the first distribution map corresponding to the current oil-water temperature difference can be obtained through the following steps: obtaining a second distribution map, the second distribution map includes multiple first distribution maps corresponding to preset oil-water temperature differences; when the current oil-water temperature difference is greater than the current preset oil-water temperature difference, determining the first distribution map corresponding to the next preset oil-water temperature difference as the first distribution map corresponding to the current oil-water temperature difference.

[0067] Figure 3 shows a schematic diagram of a second distribution diagram in one embodiment. As shown in Figure 3, the second distribution diagram includes a first distribution diagram when the oil-water temperature difference is ΔT1, a first distribution diagram when the oil-water temperature difference is ΔT2, a first distribution diagram when the oil-water temperature difference is ΔT3, and a first distribution diagram when the oil-water temperature difference is ΔT4. Each first distribution diagram includes the heat dissipation power when the oil flow rate is 6-14 L / min and the water flow rate is 6-12 L / min under the corresponding oil-water temperature difference. As can be seen from Figure 3, under the same flow rate conditions, the greater the oil-water temperature difference, the higher the heat dissipation power; under the same oil-water temperature difference conditions, the greater the oil flow rate and / or water flow rate, the higher the heat dissipation power.

[0068] When selecting the first distribution map according to the current oil-water temperature difference, if the current oil-water temperature difference is greater than the current preset oil-water temperature difference (for example, △Ti, i=1, 2, 3...), the first distribution map corresponding to △Ti+1 can be selected; otherwise, the first distribution map corresponding to △Ti can be selected.

[0069] It should be noted that, in the second distribution diagram, the smaller the intervals between the multiple preset oil-water temperature differences, that is, the smaller the intervals between ΔTi and ΔTi+1, the higher the control accuracy and the lower the power consumption.

[0070] Figure 4 shows a schematic diagram of contour lines in one embodiment. After selecting the first distribution diagram corresponding to the current oil-water temperature difference, the heat dissipation power under different oil flow rates and different water flow rates can be obtained. By interpolating the heat dissipation power and the target heat dissipation power, the contour lines corresponding to the target heat dissipation power can be obtained, such as the contour line of the target heat dissipation power P = N KW in Figure 4.

[0071] In step 203, the water flow change corresponding to the current oil flow and the oil flow change corresponding to the current water flow are determined based on the contour lines.

[0072] During the implementation process, the water flow corresponding to the current oil flow and the oil flow corresponding to the current water flow can be determined based on the contour lines; the difference between the water flow corresponding to the current oil flow and the current water flow is determined as the water flow change; and the difference between the oil flow corresponding to the current water flow and the current oil flow is determined as the oil flow change.

[0073] Continuing to refer to Figure 4, assuming that the current oil flow is L OA , the current water flow is L WA , at the current oil flow L OA Under the condition of no change, after increasing the water flow to the isoline, the water flow is L WG , the change in water flow is △L W ; At the current water flow L WA Under the condition of no change, after increasing the oil flow to the isoline, the oil flow is L OG , the oil flow rate change is △L O .

[0074] In step 204 , a target oil flow rate and a target water flow rate are determined based on the smaller of the water flow rate change and the oil flow rate change.

[0075] In some embodiments, when the oil flow change is less than or equal to the water flow change, the current water flow can be determined as the target water flow, and the sum of the oil flow change and the current oil flow can be determined as the target oil flow; when the oil flow change is greater than the water flow change, the current oil flow can be determined as the target oil flow, and the sum of the water flow change and the current water flow can be determined as the target water flow.

[0076] It can be understood that when the oil flow rate changes by △L O ≤The change in water flow is △L W When the target water flow is the current water flow L WA， The target oil flow is the increased oil flow L OG ; Otherwise, the target water flow is the increased water flow L WG , the target oil flow is the current oil flow L OA .

[0077] It should be emphasized that by increasing the flow rate of only the pump with the smaller increase in demand, the combined increase in flow rate of the electronic oil pump and the electronic water pump can be minimized, thereby minimizing power consumption.

[0078] In step 205 , the speed or duty cycle of the electronic oil pump is controlled according to the target oil flow rate, and the speed or duty cycle of the electronic water pump is controlled according to the target water flow rate.

[0079] During the implementation process, the target speed of the electronic oil pump can be determined based on the target oil flow and the displacement of the electronic oil pump, and the electronic oil pump can be controlled to operate at the target speed; or the target duty cycle of the electronic oil pump can be determined from the duty cycle and flow relationship table of the electronic oil pump based on the target oil flow, and the electronic oil pump can be controlled to operate according to the target duty cycle.

[0080] Of course, the target speed of the electronic water pump can be determined based on the target water flow rate and the displacement of the electronic water pump, and the electronic water pump can be controlled to operate at the target speed; or the target duty cycle of the electronic water pump can be determined from the duty cycle and flow relationship table of the electronic water pump based on the target water flow rate, and the electronic water pump can be controlled to operate according to the target duty cycle.

[0081] The embodiment of the present application determines the target heat dissipation power according to the motor torque and the motor speed; determines the contour line corresponding to the target heat dissipation power according to the current oil-water temperature difference and the target heat dissipation power, and the contour line is used to characterize the target heat dissipation power under different oil flow rates and different water flow rates; determines the water flow change corresponding to the current oil flow rate and the oil flow change corresponding to the current water flow rate according to the contour line; determines the target oil flow rate and the target water flow rate according to the smaller of the water flow change and the oil flow change; controls the speed or duty cycle of the electronic oil pump according to the target oil flow rate, and controls the speed or duty cycle of the electronic water pump according to the target water flow rate. The above scheme can precisely control the oil-water temperature difference, oil flow rate and water flow rate, so that the heat dissipation power meets the cooling requirements of the motor, achieves accurate heat dissipation on demand, and thus reduces the power consumption of the electric drive system and the entire vehicle.

[0082] The following describes an embodiment of the device of the present application, which can be used to implement the motor cooling control method in the above embodiment of the present application. For details not disclosed in the embodiment of the device of the present application, please refer to the embodiment of the motor cooling control method in the above embodiment of the present application.

[0083] 5 , which shows a block diagram of a motor cooling control device in an embodiment of the present application.

[0084] As shown in Figure 5, the motor cooling control device of an embodiment of the present application includes: a target heat dissipation power determination unit 501, which is configured to determine the target heat dissipation power based on the motor torque and the motor speed; a contour line determination unit 502, which is configured to determine the contour line corresponding to the target heat dissipation power based on the current oil-water temperature difference and the target heat dissipation power, and the contour line is used to characterize the target heat dissipation power under different oil flow rates and different water flow rates; a flow change determination unit 503, which is configured to determine the water flow change corresponding to the current oil flow rate and the oil flow change corresponding to the current water flow rate based on the contour line; a target flow determination unit 504, which is configured to determine the target oil flow rate and the target water flow rate based on the smaller of the water flow change and the oil flow change; a flow control unit 505, which is configured to control the speed or duty cycle of the electronic oil pump according to the target oil flow rate, and to control the speed or duty cycle of the electronic water pump according to the target water flow rate.

[0085] In some embodiments of the present application, based on the aforementioned scheme, the contour line determination unit 502 is further configured to determine a first distribution map corresponding to the current oil-water temperature difference, where the first distribution map is used to characterize the heat dissipation power under different oil flow rates and different water flow rates; the heat dissipation power in the first distribution map and the target heat dissipation power are interpolated to obtain the contour line corresponding to the target heat dissipation power.

[0086] In some embodiments of the present application, based on the aforementioned scheme, the contour line determination unit 502 is further configured to obtain a second distribution map, the second distribution map including a plurality of first distribution maps corresponding to preset oil-water temperature differences; when the current oil-water temperature difference is greater than the current preset oil-water temperature difference, the first distribution map corresponding to the next preset oil-water temperature difference is determined as the first distribution map corresponding to the current oil-water temperature difference.

[0087] In some embodiments of the present application, based on the aforementioned scheme, the flow change determination unit 503 is also configured to determine the water flow corresponding to the current oil flow and the oil flow corresponding to the current water flow according to the contour lines; determine the difference between the water flow corresponding to the current oil flow and the current water flow as the water flow change; and determine the difference between the oil flow corresponding to the current water flow and the current oil flow as the oil flow change.

[0088] In some embodiments of the present application, based on the aforementioned scheme, the target flow determination unit 504 is also configured to, when the oil flow change is less than or equal to the water flow change, determine the current water flow as the target water flow, and determine the sum of the oil flow change and the current oil flow as the target oil flow; when the oil flow change is greater than the water flow change, determine the current oil flow as the target oil flow, and determine the sum of the water flow change and the current water flow as the target water flow.

[0089] In some embodiments of the present application, based on the aforementioned scheme, the target heat dissipation power determination unit 501 is also configured to search for the target heat dissipation power in a preset mapping table according to the motor torque and the motor speed. The preset mapping table is used to characterize the correspondence between the motor torque, the motor speed and the target heat dissipation power.

[0090] In some embodiments of the present application, based on the aforementioned scheme, the flow control unit 505 is also configured to determine the target speed of the electronic oil pump according to the target oil flow and the displacement of the electronic oil pump, and control the electronic oil pump to operate at the target speed; or determine the target duty cycle of the electronic oil pump from the duty cycle and flow relationship table of the electronic oil pump according to the target oil flow, and control the electronic oil pump to operate according to the target duty cycle.

[0091] Based on the same inventive concept, an embodiment of the present application further provides a motor cooling control device. Referring to FIG6 , a schematic diagram of the structure of the motor cooling control device in an embodiment of the present application is shown. The motor cooling control device includes one or more memories 604, one or more processors 602, and at least one computer program (computer program instructions) stored in the memories 604 and executable on the processors 602. When the processors 602 execute the computer program, the aforementioned method is implemented.

[0092] In FIG6 , a bus architecture (represented by bus 600) is shown. Bus 600 may include any number of interconnected buses and bridges. Bus 600 links various circuits together, including one or more processors represented by processor 602 and memory represented by memory 604. Bus 600 may also link various other circuits together, such as peripherals, voltage regulators, and power management circuits, all of which are well known in the art and, therefore, will not be described further herein. Bus interface 605 provides an interface between bus 600 and receiver 601 and transmitter 603. Receiver 601 and transmitter 603 may be the same component, namely a transceiver, providing a unit for communicating with various other devices over a transmission medium. Processor 602 is responsible for managing bus 600 and general processing, while memory 604 may be used to store data used by processor 602 when performing operations.

[0093] Based on the same inventive concept, an embodiment of the present application provides a computer-readable storage medium, in which computer program instructions are stored. When the computer program instructions are executed by a processor, the processor is prompted to implement the steps of the method as described above.

[0094] The functions described herein may be implemented in hardware, software executed by a processor, firmware, or any combination thereof. If implemented in software executed by a processor, the functions may be stored as one or more instructions or codes on or transmitted via a computer-readable medium. Other examples and implementations are within the scope and spirit of this application and the appended claims. For example, due to the nature of software, the functions described above may be implemented using software executed by a processor, hardware, firmware, hardwiring, or a combination of any of these. Furthermore, the functional units may be integrated into a single processing unit, each unit may exist physically separately, or two or more units may be integrated into a single unit.

[0095] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only exemplary. For example, the division of the units can be a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0096] The units described as separate components may or may not be physically separate, and the components of the control device may or may not be physical units, that is, they may be located in one place or distributed across multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0097] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for enabling a computer device (which can be a personal computer, a server or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk, etc. Various media that can store computer program instructions.

[0098] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of the claims of the present application.

Claims

1. A motor cooling control method, characterized in that: The control method comprises: Determine the target heat dissipation power according to the motor torque and motor speed; According to the current oil-water temperature difference and the target heat dissipation power, determining the contour line corresponding to the target heat dissipation power, wherein the contour line is used to characterize the target heat dissipation power under different oil flow rates and different water flow rates; According to the contour lines, determining the water flow change corresponding to the current oil flow and the oil flow change corresponding to the current water flow; determining a target oil flow rate and a target water flow rate according to the smaller one of the water flow rate change and the oil flow rate change; The rotation speed or duty cycle of the electronic oil pump is controlled according to the target oil flow rate, and the rotation speed or duty cycle of the electronic water pump is controlled according to the target water flow rate.

2. The motor cooling control method according to claim 1, characterized in that: Determining the contour line corresponding to the target heat dissipation power according to the current oil-water temperature difference and the target heat dissipation power includes: Determine a first distribution diagram corresponding to the current oil-water temperature difference, wherein the first distribution diagram is used to characterize heat dissipation power under different oil flow rates and different water flow rates; The heat dissipation power in the first distribution diagram and the target heat dissipation power are interpolated to obtain contour lines corresponding to the target heat dissipation power.

3. The motor cooling control method according to claim 2, characterized in that: The determining of the first distribution map corresponding to the current oil-water temperature difference comprises: Acquire a second distribution map, wherein the second distribution map includes a plurality of first distribution maps corresponding to preset oil-water temperature differences; In the case that the current oil-water temperature difference is greater than the current preset oil-water temperature difference, the first distribution diagram corresponding to the next preset oil-water temperature difference is determined as the first distribution diagram corresponding to the current oil-water temperature difference.

4. The motor cooling control method according to any one of claims 1 to 3, characterized in that: Determining the water flow change corresponding to the current oil flow and the oil flow change corresponding to the current water flow according to the contour line includes: According to the contour lines, determining the water flow corresponding to the current oil flow and the oil flow corresponding to the current water flow; Determine the difference between the water flow corresponding to the current oil flow and the current water flow as the water flow change; The difference between the oil flow corresponding to the current water flow and the current oil flow is determined as the oil flow change.

5. The motor cooling control method according to any one of claims 1 to 3, characterized in that: The step of determining a target oil flow rate and a target water flow rate according to the smaller one of the water flow rate change and the oil flow rate change comprises: In the case where the oil flow change is less than or equal to the water flow change, the current water flow is determined as the target water flow, and the sum of the oil flow change and the current oil flow is determined as the target oil flow; When the oil flow change is greater than the water flow change, the current oil flow is determined as the target oil flow, and the sum of the water flow change and the current water flow is determined as the target water flow.

6. The motor cooling control method according to any one of claims 1 to 3, characterized in that: Determining the target heat dissipation power according to the motor torque and the motor speed includes: The target heat dissipation power is searched in a preset mapping table according to the motor torque and the motor speed, and the preset mapping table is used to characterize the corresponding relationship between the motor torque, the motor speed and the target heat dissipation power.

7. The motor cooling control method according to any one of claims 1 to 3, characterized in that: The controlling the speed or duty cycle of the electronic oil pump according to the target oil flow rate includes: Determining a target speed of the electronic oil pump according to the target oil flow rate and the displacement of the electronic oil pump, and controlling the electronic oil pump to operate at the target speed; Alternatively, the target duty cycle of the electronic oil pump is determined from a duty cycle and flow relationship table of the electronic oil pump according to the target oil flow, and the electronic oil pump is controlled to operate according to the target duty cycle.

8. A motor cooling control device, characterized in that: The device comprises: a target heat dissipation power determination unit, configured to determine the target heat dissipation power according to the motor torque and the motor speed; A contour line determination unit is configured to determine a contour line corresponding to the target heat dissipation power according to the current oil-water temperature difference and the target heat dissipation power, wherein the contour line is used to characterize the target heat dissipation power under different oil flow rates and different water flow rates; a flow rate change determination unit configured to determine the water flow rate change corresponding to the current oil flow rate and the oil flow rate change corresponding to the current water flow rate according to the contour line; a target flow rate determination unit configured to determine a target oil flow rate and a target water flow rate according to the smaller of the water flow rate change amount and the oil flow rate change amount; The flow control unit is configured to control the rotation speed or duty cycle of the electronic oil pump according to the target oil flow rate, and to control the rotation speed or duty cycle of the electronic water pump according to the target water flow rate.

9. A motor cooling control device, comprising a processor and a memory, characterized in that: The memory stores computer program instructions that can be executed by the processor, and when the processor executes the computer program instructions, the steps of the method according to any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores computer program instructions, which, when executed by a processor, prompt the processor to implement the steps of the method according to any one of claims 1 to 7.

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