Control method for electronic oil pump, lubrication system, storage medium and controller

Abstract

The embodiment of the application provides a control method for an electronic oil pump, a lubricating system, a storage medium and a controller. The control method is applied to the lubricating system, the lubricating system comprises the electronic oil pump, and the control method comprises the following steps: determining a target output flow of the electronic oil pump; acquiring a real-time oil temperature and a real-time working pressure of the electronic oil pump; determining a target rotating speed of the electronic oil pump according to the target output flow, the real-time oil temperature and the real-time working pressure based on a preset MAP (Mapping), wherein the preset MAP is generated according to a plurality of sample oil temperatures, a plurality of sample working pressures, a plurality of sample output flows and a plurality of rotating speeds of the electronic oil pump; and adjusting the rotating speed of an oil pump motor of the electronic oil pump according to the target rotating speed, so as to adjust the actual output flow of the electronic oil pump to the target output flow. The output flow of the oil pump is accurately controlled based on the oil temperature, the oil pressure signal and the rotating speed, so that the actual lubricating demand of the system is met, energy consumption is reduced and efficiency is improved.

Description

Technical Field

[0001] This application relates to the field of electric drive assembly lubrication system technology, specifically to a control method, lubrication system, storage medium and controller for an electronic oil pump. Background Technology

[0002] The core of high-speed, heavy-duty electric drive technology lies in high speed, high efficiency, high integration, and high power density. Structurally, a high-speed, heavy-duty electric drive system integrates a high-speed drive motor and a multi-speed gearbox, which presents new challenges to the assembly's lubrication system: at high speeds, centrifugal force can lead to poor lubrication; furthermore, high speeds result in significant oil churning losses in the gears, reducing efficiency; and the high power density and poor heat dissipation of the system can easily cause the lubricating oil to overheat. Traditional splash lubrication methods are no longer sufficient for the lubrication requirements of this assembly. While mechanical pump lubrication technology can improve the lubrication effect to some extent, it also presents the following problems: it is not decoupled from the drive motor speed, making the lubrication flow uncontrollable; and to accommodate both low-speed and high-speed conditions, its displacement is large, leading to high energy consumption.

[0003] However, there is no suitable lubrication control method for high-speed, heavy-load electric drive systems in the existing technology. It is impossible to solve the problem of how to accurately control the oil pump to provide lubrication flow to meet the actual needs of the system in high-speed, heavy-load electric drive systems, which leads to energy waste and low efficiency. Summary of the Invention

[0004] The purpose of this application is to provide a control method, lubrication system, storage medium, and controller for an electronic oil pump.

[0005] To achieve the above objectives, the first aspect of this application provides a control method for an electronic oil pump, applied to a lubrication system, the lubrication system including an electronic oil pump, and the control method comprising:

[0006] Determine the target output flow rate of the electronic oil pump;

[0007] Obtain the real-time oil temperature and real-time operating pressure of the electronic oil pump;

[0008] Based on the preset MAP, the target speed of the electronic oil pump is determined according to the target output flow rate, real-time oil temperature, and real-time working pressure. The preset MAP is generated based on multiple sample oil temperatures, multiple sample working pressures, multiple sample output flow rates, and multiple electronic oil pump speeds.

[0009] The speed of the electric oil pump motor is adjusted according to the target speed to adjust the actual output flow of the electric oil pump to the target output flow.

[0010] In the embodiments of this application, adjusting the speed of the oil pump motor of the electronic oil pump according to the target speed to adjust the actual output flow of the electronic oil pump to the target output flow includes: adjusting the speed of the oil pump motor to the target speed; repeating the steps of obtaining the real-time oil temperature and real-time working pressure of the electronic oil pump until an updated target speed is obtained; and adjusting the speed of the oil pump motor to the updated target speed.

[0011] In embodiments of this application, the control method further includes: acquiring sample output flow rates of the electronic oil pump under different test parameter sets, wherein the test parameter sets include the oil temperature of the lubricating oil in the oil reservoir, the working pressure of the electronic oil pump, and the rotational speed of the oil pump motor of the electronic oil pump; and generating a preset MAP diagram of the electronic oil pump based on multiple test parameter sets and the sample output flow rates corresponding to each test parameter set.

[0012] In embodiments of this application, the lubrication system further includes an oil reservoir and a gearbox. The oil reservoir stores lubricating oil inside the gearbox, and an electronic oil pump pumps the lubricating oil from the oil reservoir to the lubrication channels of the gearbox. Determining the target output flow rate of the electronic oil pump includes: acquiring the real-time speed and real-time torque of the drive motor of the gearbox; determining the characteristic region where the real-time speed and real-time torque are located in the output characteristic graph of the drive motor, and defining this characteristic region as the target region. The output characteristic graph includes characteristic curves corresponding to the drive motor at different speeds and torques, with each two adjacent characteristic curves forming a characteristic region; determining the maximum required flow rate of the gearbox in the target region; and defining the maximum required flow rate as the target output flow rate of the electronic oil pump.

[0013] In the embodiments of this application, determining the maximum demand flow of the gearbox in the target area includes: determining the characteristic curve with the larger speed and torque among the two characteristic curves corresponding to the target area as the target characteristic curve, wherein the target characteristic curve includes multiple operating points, and the speed and torque of the drive motor corresponding to each operating point are different; obtaining the demand flow of the gearbox at each operating point; and determining the demand flow with the largest value as the maximum demand flow of the gearbox in the target area.

[0014] In the embodiments of this application, the multiple operating points of the target characteristic curve include at least the operating points of the drive motor at maximum torque, maximum power, and maximum speed; the maximum demand flow rate among the operating points of the drive motor at maximum torque, maximum power, and maximum speed is the maximum demand flow rate of the target area.

[0015] In embodiments of this application, the control method further includes: generating an output characteristic map of the drive motor based on the correspondence between the drive motor of the gearbox at multiple speeds and torques, wherein the output characteristic map includes at least the output characteristic curves of the drive motor at four different torque ranges; and dividing the output characteristic map into multiple characteristic regions according to the multiple output characteristic curves.

[0016] In the embodiments of this application, obtaining the real-time speed and real-time torque of the drive motor of the gearbox includes: controlling the electronic oil pump to start; and obtaining the real-time speed and real-time torque of the drive motor of the gearbox when the start-up time of the electronic oil pump reaches a preset time and the oil temperature of the lubricating oil in the oil tank is greater than a third preset temperature.

[0017] In embodiments of this application, controlling the start-up of the electronic oil pump includes: acquiring the oil temperature of the lubricating oil in the oil reservoir in real time; determining the starting speed and the slope of the starting speed of the electronic oil pump based on the oil temperature; wherein, when the oil temperature is greater than a first preset temperature and less than a second preset temperature, the electronic oil pump is controlled to start at a first speed, and the slope of the starting speed is a first slope; when the oil temperature is greater than or equal to the second preset temperature and less than a third preset temperature, the electronic oil pump is controlled to start at a second speed, and the slope of the starting speed is a second slope; when the oil temperature is greater than or equal to the third preset temperature and less than a fourth preset temperature, the electronic oil pump is controlled to start at a third speed, and the slope of the starting speed is a third slope; the first speed is less than the second speed, the second speed is less than the third speed, the first slope is less than the second slope, and the second slope is less than the third slope.

[0018] In embodiments of this application, the control method further includes: prohibiting the electronic oil pump from starting when the oil temperature is less than or equal to a first preset temperature; and allowing the electronic oil pump to start when the oil temperature is greater than the first preset temperature.

[0019] In embodiments of this application, determining the target output flow rate of the electronic oil pump includes: acquiring the flow rate input by the user; and determining the input flow rate as the target output flow rate.

[0020] In the embodiments of this application, the lubrication system in the above control method is the lubrication system of a high-speed heavy-duty electric drive gearbox.

[0021] A second aspect of this application provides a controller configured to perform the control method described above for an electronic oil pump.

[0022] A third aspect of this application provides a lubrication system including a controller configured to perform the control method for an electronic oil pump described above.

[0023] In the embodiments of this application, the lubrication system is the lubrication system of a high-speed heavy-duty electric drive gearbox.

[0024] A fourth aspect of this application provides a machine-readable storage medium storing instructions that, when executed by a controller, configure the controller to perform the aforementioned control method for an electronic oil pump.

[0025] The above technical solution, after determining the target output flow rate of the electronic oil pump, acquires the real-time oil temperature and real-time operating pressure of the electronic oil pump. Based on a preset MAP (Motion Mapping Chart), the target rotational speed of the electronic oil pump is determined according to the target output flow rate, real-time oil temperature, and real-time operating pressure. The preset MAP is generated based on multiple sample oil temperatures, multiple sample operating pressures, multiple sample output flow rates, and multiple rotational speeds of the electronic oil pump. The rotational speed of the electronic oil pump motor is adjusted according to the target rotational speed to adjust the actual output flow rate of the electronic oil pump to the target output flow rate. This technical solution can precisely control the oil pump according to the actual flow rate required by the system, thereby achieving on-demand lubrication flow. By precisely controlling the output flow rate of the oil pump based on oil temperature, oil pressure signals, and rotational speed, it reduces energy consumption and improves efficiency while meeting lubrication requirements.

[0026] Other features and advantages of the embodiments of this application will be described in detail in the following detailed description section. Attached Figure Description

[0027] The accompanying drawings are provided to further illustrate the embodiments of this application and form part of the specification. They are used together with the following detailed description to explain the embodiments of this application, but do not constitute a limitation on the embodiments of this application. In the drawings:

[0028] Figure 1 A schematic diagram of the structural framework of a lubrication system according to an embodiment of this application is shown.

[0029] Figure 2 A schematic flowchart of a control method for an electronic oil pump according to an embodiment of this application is shown.

[0030] Figure 3 An output characteristic diagram of a drive motor according to an embodiment of this application is schematically shown;

[0031] Figure 4 A schematic diagram illustrating the lubrication demand flow rate according to an embodiment of this application is shown.

[0032] Figure 5 This schematically illustrates the startup flowchart of an electronic oil pump according to an embodiment of this application;

[0033] Figure 6 The diagram illustrates the internal structure of a computer device according to an embodiment of this application.

[0034] Figure Labels

[0035] 110 Oil reservoir 120 Suction filter

[0036] 130 Electric oil pump 140 Cooler

[0037] 150 Oil pressure sensor 160 Oil temperature sensor

[0038] 170 Oil pump controller; 180 Drive motor controller

[0039] 190 gearbox Detailed Implementation

[0040] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for illustration and explanation of the embodiments of this application and are not intended to limit the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0041] The control method for electronic oil pumps provided in this application can be applied to, for example... Figure 1 The lubrication system shown. (As illustrated) Figure 1 As shown, a lubrication system for a high-speed, heavy-duty electric drive transmission is provided. The lubrication system includes:

[0042] Oil reservoir 110 is used to store lubricating oil, and oil reservoir 110 is connected to suction filter 120;

[0043] The suction filter 120 has its first end connected to the electronic oil pump 130 and its second end connected to the oil reservoir 110. The suction filter 120 is used to filter the lubricating oil delivered to the electronic oil pump 130.

[0044] An electronic oil pump 130 is provided. The first end of the electronic oil pump 130 is connected to the cooler 140 and the oil pump controller 170, and the second end of the electronic oil pump 130 is connected to the suction filter 120. The electronic oil pump 130 is used to deliver lubricating oil to the gearbox 190.

[0045] Cooler 140, with its first end connected to gearbox 190 and its second end connected to electronic oil pump 130 and oil pump controller 170, is used to cool the lubricating oil delivered to gearbox 190.

[0046] The oil pressure sensor 150 is installed at the outlet of the electronic oil pump 130 to detect the working pressure of the electronic oil pump 130 in real time and feed it back to the oil pump controller 170.

[0047] The oil temperature sensor 160 is installed inside the oil reservoir 110 and connected to the oil pump controller 170 to provide real-time feedback on the oil temperature inside the oil reservoir 110 to the oil pump controller 170.

[0048] The oil pump controller 170 has its first terminal connected to the oil pressure sensor 150 and the oil temperature sensor 160, its second terminal connected to the electronic oil pump 130 and the cooler 140, and its third terminal connected to the drive motor controller 180. These components are used to acquire the torque and speed of the drive motor in real time and to control the speed of the electronic oil pump 130. The oil pump controller 170 and the electronic oil pump 130 can be integrated or separate units. If separate, they need to be connected using a wiring harness. The oil pump controller 170 and the drive motor controller 180 are connected via a CAN bus.

[0049] The drive motor controller 180 is connected to the drive motor (not shown) of the gearbox 190, and is used to control the drive motor and feed back the torque and speed of the drive motor to the oil pump controller 170.

[0050] The gearbox 190 includes multiple lubrication channels for delivering lubricating oil supplied by the electronic oil pump 130 to the parts requiring lubrication within each lubrication channel. These multiple lubrication channels may refer to lubrication branches 1-4 in the diagram.

[0051] Figure 2 A schematic flowchart illustrating a control method for an electronic oil pump according to an embodiment of this application is shown. Figure 2 As shown, in one embodiment of this application, a control method for an electronic oil pump is provided. This embodiment mainly applies this method to the above-mentioned... Figure 1 The lubrication system in the middle includes the following steps:

[0052] Step 201: Determine the target output flow rate of the electronic oil pump.

[0053] Step 202: Obtain the real-time oil temperature and real-time operating pressure of the electronic oil pump.

[0054] Step 203: Based on the preset MAP, determine the target speed of the electronic oil pump according to the target output flow rate, real-time oil temperature, and real-time working pressure. The preset MAP is generated based on multiple sample oil temperatures, multiple sample working pressures, multiple sample output flow rates, and multiple electronic oil pump speeds.

[0055] Step 204: Adjust the speed of the electric oil pump motor according to the target speed to adjust the actual output flow of the electric oil pump to the target output flow.

[0056] An electronic oil pump is an electrically driven oil pump primarily used for compressing or transporting liquids. Compared to traditional mechanical oil pumps, electronic oil pumps offer advantages such as higher efficiency, more precise flow control, and simpler operation and maintenance. It should be understood that the flow rate of the oil pump can be adjusted by regulating the motor speed or by adjusting the opening of the internal impeller. Precise flow control allows the oil pump to meet various operational requirements. In this technical solution, the output flow rate of the electronic oil pump can be controlled by the motor speed. It should be understood that the above method can be applied to… Figure 1 In the lubrication system, the output flow rate of the electronic oil pump can refer to the lubricating oil. Lubricating oil is a liquid or semi-solid lubricant used in various types of mechanical equipment to reduce friction and protect machinery and processed parts. Its main functions include lubrication, auxiliary cooling, rust prevention, cleaning, sealing, and buffering. The electronic oil pump is connected to the gearbox and is responsible for delivering lubricating oil to it. The gearbox includes multiple lubrication channels that require lubrication. The amount of lubricating oil needed for these channels is determined by the actual conditions of the mechanical equipment. Based on the premise of improving resource utilization, the electronic oil pump delivers the corresponding amount of lubricating oil to the gearbox according to the required flow rate of the lubrication channels. Therefore, in this technical solution, the total flow rate required by the gearbox can be used as the target output flow rate of the electronic oil pump.

[0057] It should be understood that in this technical solution, the output flow rate of the electronic oil pump is regulated by the speed of the oil pump motor. Therefore, after determining the target output flow rate of the electronic oil pump under the current conditions, the current real-time speed of the electronic oil pump needs to be adjusted to the target speed corresponding to the target output flow rate. Once the real-time speed of the electronic oil pump reaches the target speed, it can output the total flow rate required by the transmission. For example, if the current real-time speed of the electronic oil pump is 1000 r / min, and the transmission requires 20 L / min of lubricating oil, the real-time speed corresponding to 20 L / min of lubricating oil is 2000 r / min. Therefore, by adjusting the speed of the electronic oil pump from 1000 r / min to 2000 r / min, when the real-time speed of the electronic oil pump is 2000 r / min, the electronic oil pump can output 20 L / min of lubricating oil to the transmission to meet the transmission's needs.

[0058] Furthermore, in this technical solution, the target rotational speed corresponding to the target output flow rate is not determined solely by the target output flow rate, but also includes three other conditions: a preset MAP (Motor Range Map), real-time oil temperature, and real-time operating pressure. Specifically, an oil temperature sensor is installed inside the oil reservoir, which is connected to the electronic oil pump and delivers lubricating oil to it. The oil temperature sensor allows for real-time monitoring of the lubricating oil temperature delivered to the electronic oil pump. An oil pressure sensor is installed at the outlet of the electronic oil pump, which allows for real-time monitoring of the pump's operating pressure. The preset MAP can refer to a flow rate MAP of the electronic oil pump obtained through extensive experimental calculations. Specifically, this MAP can be generated based on multiple sample oil temperatures, multiple sample operating pressures, multiple sample output flow rates, and multiple rotational speeds of the electronic oil pump.

[0059] The above technical solution can accurately control the oil pump according to the actual flow requirements of the system, thereby achieving on-demand lubrication flow. The output flow of the oil pump is precisely controlled based on oil temperature, oil pressure signals and speed, thereby reducing energy consumption and improving efficiency while meeting lubrication requirements.

[0060] Figure 2 This is a flowchart illustrating a control method for an electronic oil pump in one embodiment. It should be understood that, although... Figure 2 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise explicitly stated herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figure 2 At least some of the steps in the process may include multiple sub-steps or multiple stages. These sub-steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these sub-steps or stages is not necessarily sequential, but can be executed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.

[0061] In one embodiment, the target rotational speed corresponding to the target output flow rate is not determined solely by the target output flow rate, but also by three other conditions: a preset MAP (Motion Mapping Chart), real-time oil temperature, and real-time operating pressure. Therefore, after determining the target output flow rate of the electronic oil pump 130 under the current conditions, the current real-time rotational speed of the electronic oil pump 130 is adjusted to the target rotational speed corresponding to the target output flow rate. Once the real-time rotational speed of the electronic oil pump 130 reaches the target rotational speed, it can output the total flow rate required by the transmission 190. It should be understood that adjusting the real-time rotational speed of the electronic oil pump 130 to the target rotational speed takes a certain amount of time, and the real-time temperature and real-time operating pressure inside the lubrication system will gradually change over time due to the change in the rotational speed of the electronic oil pump 130. Therefore, when the electronic oil pump 130 reaches the target rotational speed, the real-time oil temperature and real-time operating pressure inside the lubrication system are different from the initial oil temperature and initial operating pressure. Thus, for the electronic oil pump 130, the target rotational speed is determined by the target output flow rate, the preset MAP, the real-time oil temperature, and the real-time operating pressure; when the real-time oil temperature and real-time operating pressure change, the target rotational speed will also change. Therefore, when the electronic oil pump 130 reaches the target speed, the latest target speed needs to be recalculated based on the latest real-time oil temperature and real-time working pressure, so as to adjust the speed of the electronic oil pump 130 to the updated target speed.

[0062] In one embodiment, it should be understood that in practical applications, the time required to adjust the real-time speed of the electronic oil pump 130 to the target speed is very short, and the temperature of the lubricating oil changes slowly; slight fluctuations within a short period can be considered negligible. However, for the real-time working pressure within the lubrication system, even if the speed change occurs only briefly, the real-time working pressure will fluctuate significantly due to the speed change. Therefore, when the electronic oil pump 130 reaches the target speed, the real-time working pressure within the lubrication system differs from the initial working pressure. Theoretically, the target speed of the electronic oil pump 130 can be determined by the target output flow rate, the preset MAP diagram, the real-time oil temperature, and the real-time working pressure. When the real-time working pressure changes, the target speed also changes. Therefore, when the electronic oil pump 130 reaches the target speed, a second speed adjustment is required; that is, the latest target speed is recalculated based on the latest real-time working pressure, thereby adjusting the speed of the electronic oil pump 130 to the updated target speed.

[0063] In one embodiment, the preset MAP can refer to a flow rate MAP of the electronic oil pump 130 obtained through extensive experimental calculations. Specifically, sample output flow rates of the electronic oil pump 130 under different test parameter sets are obtained. These test parameter sets include the oil temperature of the lubricating oil in the oil tank 110, the operating pressure of the electronic oil pump 130, and the rotational speed of the pump motor. A preset MAP of the electronic oil pump 130 is generated based on multiple test parameter sets and the sample output flow rates corresponding to each test parameter set. It should be understood that since the output flow rate is from lubricating oil, which is a liquid, the state and characteristics of the liquid are related to its temperature. For example, at low temperatures, the liquid may be close to solid, and the high viscosity of the liquid will bring greater resistance to the system operation. Therefore, each different liquid will have an optimal operating temperature range for the corresponding system. In this technical solution, three temperature ranges can be set for the lubricating oil. Taking T0, T1, T2, and T3 as examples, the temperature ranges of the lubricating oil can be as follows:

[0064] (1) T0 < T < T1, at this time it can be determined that the system temperature is low, the viscosity of the lubricating oil is high, and the operating resistance of the electronic oil pump 130 is large.

[0065] (2) T1≤T<T2, at this time it can be determined that the system temperature is normal, the viscosity of the lubricating oil is moderate, and the operating resistance of the electronic oil pump 130 is moderate.

[0066] (3) T2≤T<T3, at this time it can be determined that the system temperature is high. At this time, the viscosity of the lubricating oil is small and the running resistance of the electronic oil pump 130 is small.

[0067] Clearly, the oil viscosity is lowest and the operating resistance of the electronic oil pump 130 is lowest when the temperature is between T2 and T < T3. Therefore, this temperature range can be set as the optimal operating temperature range for the lubrication system. It should be understood that for a system to meet actual needs, it must first reach a stable operating state. Therefore, only when the lubrication system's temperature meets the requirement of T2 ≤ T < T3 (i.e., stable operation) will the flow rate requirement of the transmission 190 be obtained, thereby controlling the rotational speed of the electronic oil pump 130 to adjust to the target speed to deliver the target flow rate to the various lubrication passages of the transmission 190.

[0068] Furthermore, the determination of the preset MAP should be obtained experimentally within the temperature range during stable system operation. Specifically, for example, the preset flow rate MAP represents the output flow rate of the electronic oil pump 130 at different oil temperatures, pressures, and speeds. The flow rate MAP needs to be obtained through multiple bench tests, with the following test conditions:

[0069] 1) Within the oil temperature range of T2≤T<T3, select several temperature points evenly;

[0070] 2) Within the speed range from zero to the maximum speed, several different speed points are selected evenly;

[0071] 3) Select several pressure points evenly within the pressure range from zero to the maximum pressure.

[0072] Based on the above conditions, a large number of experiments were conducted, and a flow rate MAP diagram for an electronic oil pump 130, as shown in Table 1, was obtained, including:

[0073]

[0074]

[0075] Table 1. Flow rate MAP of electronic oil pump 130

[0076] In one embodiment, the lubrication system further includes an oil reservoir 110 and a gearbox 190. The oil reservoir 110 stores lubricating oil inside the gearbox 190, and the electronic oil pump 130 pumps the lubricating oil from the oil reservoir 110 to the lubrication channels of the gearbox 190. The target output flow rate of the electronic oil pump 130 is the total flow rate required by the gearbox 190. In this technical solution, the total flow rate required by the gearbox 190 is determined by the speed and torque of the drive motor of the gearbox 190. Therefore, to determine the target output flow rate of the electronic oil pump 130, the real-time speed and real-time torque of the drive motor of the gearbox 190 are first obtained. Secondly, the characteristic region where the real-time speed and real-time torque are located in the output characteristic diagram of the drive motor is determined, and this characteristic region is defined as the target region. The output characteristic diagram includes the characteristic curves corresponding to the drive motor at different speeds and torques, with each two adjacent characteristic curves forming a characteristic region. After determining the characteristic region, the maximum required flow rate of the gearbox 190 in the target region is determined, thereby the maximum required flow rate can be determined as the target output flow rate of the electronic oil pump 130.

[0077] Specifically, such as Figure 3 As shown, an output characteristic diagram of a drive motor is provided. Figure 3 In the diagram, the output characteristics of the drive motor are divided into four output characteristic regions: I, II, III, and IV. Curves a, b, c, and d are all output characteristic curves of the drive motor. Curve a is the external characteristic curve, curve b is the rated output characteristic curve, and curves c and d are the output characteristic curves of the motor under medium and low loads, respectively. All of these can be customized based on the output characteristics of the drive motor.

[0078] In one embodiment, the characteristic curve with the larger speed and torque among the two characteristic curves corresponding to the target region can be determined as the target characteristic curve. The target characteristic curve includes multiple operating points, each corresponding to a different speed and torque of the drive motor. The required flow rate of the gearbox 190 at each operating point is obtained, and the maximum required flow rate is determined as the maximum required flow rate of the gearbox 190 within the target region. Specifically, using... Figure 3 Taking the output characteristic diagram shown as an example, the lubrication flow required by the system when the gearbox 190 operates at the maximum torque point, maximum power point, and maximum speed point on the aforementioned curves is calculated based on the design standards of the meshing gears and bearings inside the gearbox 190. For example, three operating points of the drive motor can be selected on curves a, b, c, and d, respectively, which represent the maximum torque point, maximum power point, and maximum speed point on that curve. Figure 3 As shown, the points of maximum torque, maximum power, and maximum speed on curves a, b, c, and d are respectively: point A, point B, point C, point D, point E, point F, point G, point H, point K, point L, point M, and point N.

[0079] Furthermore, the target characteristic curve includes at least the operating points of the drive motor at its maximum torque, maximum power, and maximum speed, and the maximum flow demand among these operating points is the maximum flow demand in the target region. Specifically, such as... Figure 4 As shown, a lubrication demand flow rate diagram is provided. For each curve, after selecting the maximum torque point, maximum power point, and maximum speed point respectively, the flow rate demand of the transmission 190 at the maximum torque point, maximum power point, and maximum speed point on each curve is compared, and the maximum flow rate Qmax among the three operating points is selected as the lubrication demand flow rate for each region. For example: the maximum demand flow rate Qmax-a on curve a is the flow rate demand of the transmission 190 when the drive motor is working in region I; the maximum demand flow rate Qmax-b on curve b is the flow rate demand of the transmission 190 when the drive motor is working in region II; the maximum demand flow rate Qmax-c on curve c is the flow rate demand of the transmission 190 when the drive motor is working in region III; and the maximum demand flow rate Qmax-d on curve d is the flow rate demand of the transmission 190 when the drive motor is working in region IV.

[0080] Furthermore, the oil pump controller 170 uses the speed and torque values ​​of the drive motor to determine which region the motor is currently in (region I, region II, region III), and determines the lubrication flow rate (Qmax-a, Qmax-b, Qmax-c, Qmax-d) required by the gearbox 190 when the motor is operating in this region. This lubrication flow rate is then used as the target flow rate output by the electronic oil pump 130. For example, when the drive motor is operating in region I, the target flow rate of the electronic oil pump 130 is Qmax-a; when the drive motor is operating in region II, the target flow rate of the electronic oil pump 130 is Qmax-b; when the drive motor is operating in region III, the target flow rate of the electronic oil pump 130 is Qmax-c; and when the drive motor is operating in region IV, the target flow rate of the electronic oil pump 130 is Qmax-d.

[0081] In one embodiment, an output characteristic map of the drive motor is generated based on the correspondence between the drive motor of the gearbox 190 at multiple speeds and torques. The output characteristic map includes at least the output characteristic curves of the drive motor at four different torque ranges. The output characteristic map is divided into multiple characteristic regions based on the multiple output characteristic curves.

[0082] In one embodiment, the total flow rate required by the transmission 190 is determined by the rotational speed and torque of the drive motor of the transmission 190. Therefore, to determine the target output flow rate of the electric oil pump 130, the real-time rotational speed and real-time torque of the drive motor of the transmission 190 are first obtained. Specifically, to obtain the real-time rotational speed and real-time torque of the drive motor of the transmission 190, the electric oil pump 130 needs to be controlled to start first. When the startup duration of the electric oil pump 130 reaches the preset duration and the oil temperature of the lubricating oil in the oil storage tank 110 is greater than the third preset temperature, the real-time rotational speed and real-time torque of the drive motor of the transmission 190 are obtained. It should be understood that for an electric mechanical device such as an electric oil pump, there is a minimum startup temperature. Once the ambient temperature is lower than the minimum startup temperature, the pressure and resistance on the electric oil pump will be too large, resulting in abnormal startup and serious equipment damage. Similarly, in this technical solution, after the vehicle is powered on, the oil pump controller 170 collects the signal of the oil temperature sensor 160 in real time and judges based on the current oil temperature fed back by the oil temperature sensor 160 whether the current oil temperature is higher than the minimum startup temperature of the electric oil pump 130. If it is lower than the minimum startup temperature, the electric oil pump 130 cannot be started. If it is higher than the minimum startup temperature, the electric oil pump 130 can be started normally. Therefore, the first preset temperature can be the minimum startup temperature of the electric oil pump 130. Taking the first preset temperature T0 as an example, the oil pump controller 170 collects the signal of the oil temperature sensor 160 in real time and judges based on the current oil temperature T fed back by the oil temperature sensor 160. When the current oil temperature T < T0, the electric oil pump 130 is not started. When the current oil temperature T ≥ T0, the electric oil pump 130 is started normally.

[0083] Further, after the electric oil pump 130 starts normally, the temperature of the lubricating oil in the oil storage tank 110 rises continuously over time. To reduce the energy consumption of the lubrication system, when the lubricating oil temperature is between the first preset temperature and the third preset temperature, the real-time rotational speed and real-time torque of the drive motor of the transmission 190 are not collected. Only when the lubricating oil temperature reaches the third preset temperature, the real-time rotational speed and real-time torque of the drive motor of the transmission 190 are collected, and then the total flow rate required by the transmission 190, that is, the target output flow rate of the electric oil pump 130, is determined according to the current real-time rotational speed and real-time torque. Specifically, in this technical solution, the third preset temperature can be regarded as a judgment condition for whether the lubrication system enters the best working mode. When the lubricating oil temperature reaches the third preset temperature, the lubrication system operates stably in the best working mode, and the electric oil pump 130 enters the rotational speed control mode of the real-time working condition. In this mode, the controller can calculate the total flow rate required by the transmission 190 based on the rotational speed and torque of the drive motor.

[0084] In one embodiment, the electronic oil pump 130 can start normally when the start-up time of the electronic oil pump 130 reaches a preset time and the oil temperature of the lubricating oil in the oil reservoir 110 reaches a first preset temperature. It should be understood that the system temperature before the electronic oil pump 130 starts can be any value. For example, if the electronic oil pump 130 has worked normally under certain temperature conditions before being shut down, then when restarting the electronic oil pump 130, the system temperature may be higher than the first preset temperature. Therefore, before controlling the start of the electronic oil pump 130, the oil temperature in the system needs to be detected, i.e., the oil temperature of the lubricating oil in the oil reservoir 110 needs to be obtained in real time. Based on the oil temperature, the starting speed and the slope of the starting speed of the electronic oil pump 130 are determined. Specifically, when the oil temperature is greater than or equal to the first preset temperature and less than the second preset temperature, the electronic oil pump 130 is controlled to start at a first speed, and the slope of the starting speed is the first slope. When the oil temperature is greater than or equal to the second preset temperature and less than the third preset temperature, the electronic oil pump 130 is controlled to start at a second speed, and the slope of the starting speed is the second slope. When the oil temperature is greater than or equal to the third preset temperature and less than the fourth preset temperature, the electronic oil pump 130 is controlled to start at a third speed, and the slope of the starting speed is the third slope. The first speed is less than the second speed, the second speed is less than the third speed, the first slope is less than the second slope, and the second slope is less than the third slope. Specifically, taking the first preset temperature as T0, the second preset temperature as T1, the third preset temperature as T2, and the fourth preset temperature as T3 as an example, ... Figure 5 The diagram illustrates a startup flowchart for an electronic oil pump. When T0 ≤ T < T1, the temperature is low, the oil viscosity is high, and the pump's operating resistance is high. The electronic oil pump 130 is started at a low speed n1, with the startup speed slope set to Δn1. When T1 ≤ T < T2, the temperature reaches room temperature, and the electronic oil pump 130 starts at speed n2, with the startup speed slope set to Δn2. When T2 ≤ T < T3, the temperature reaches a high temperature, the electronic oil pump 130's operating resistance is low, and the electronic oil pump 130 starts at speed n3, with the startup speed slope set to Δn3. After startup, the pump needs to run at the startup speed for a certain period. The specific running time can be calibrated based on the actual lubrication system to ensure that the lubricating oil pumped by the electronic oil pump 130 reaches all lubrication points of the transmission 190 during the startup running time.

[0085] Furthermore, after startup, the electronic oil pump 130 controller needs to determine whether to enter the speed control mode based on real-time operating conditions based on the real-time oil temperature fed back by the oil temperature sensor 160. If the oil temperature remains within the range of T0≤T<T1 after a certain period of startup, the electronic oil pump 130 continues to operate at speed n1; if the oil temperature has risen to the range of T1≤T<T2 after a certain period of startup, the speed of the electronic oil pump 130 increases from n1 to n2, with a speed increase slope of Δn2, and operates at speed n2; if the oil temperature has risen to the range of T2≤T<T3 after a certain period of startup, the electronic oil pump 130 enters the speed control mode based on real-time operating conditions. If the oil temperature remains within the range of T1≤T<T2 after a certain period of startup, the electronic oil pump 130 continues to operate at speed n2; if the oil temperature has risen to the range of T2≤T<T3 after a certain period of startup, the electronic oil pump 130 enters the speed control mode based on real-time operating conditions. If the oil temperature T ≥ T2 after a certain period of operation, the electronic oil pump 130 directly enters the speed control mode based on real-time operating conditions. After the electronic oil pump 130 enters the speed control mode based on real-time operating conditions, the controller first obtains the speed and torque values ​​of the drive motor to calculate the lubrication flow required by the system, and then calculates the target speed of the electronic oil pump 130 based on the flow rate MAP map of the electronic oil pump 130 preset inside the controller.

[0086] In one embodiment, after the vehicle is powered on, the oil pump controller 170 collects the signal from the oil temperature sensor 160 in real time and determines whether the current oil temperature is higher than the minimum start-up temperature of the electronic oil pump 130, i.e., the first preset temperature, based on the current oil temperature fed back by the oil temperature sensor 160. If the current oil temperature is lower than the first preset temperature, the pump will not start; if it is higher than the first preset temperature, the electronic oil pump 130 will start. For example, taking the first preset temperature as 0°C, the oil pump controller 170 collects the signal from the oil temperature sensor 160 in real time and determines whether the current oil temperature is higher than 0°C. When the current system oil temperature is detected to be lower than 0°C, the electronic oil pump 130 is not allowed to start; when the current system oil temperature is detected to be higher than 0°C, the electronic oil pump 130 is allowed to start normally.

[0087] In one embodiment, the gearbox 190 includes multiple lubrication channels that require lubrication. The amount of lubricating oil needed for these channels is determined by the actual conditions of the machinery. Based on the premise of maximizing resource utilization, the electronic oil pump 130 supplies the appropriate amount of lubricating oil to the gearbox 190 according to the required flow rate of the lubrication channels. Therefore, in this technical solution, the total flow rate required by the gearbox 190 can be used as the target output flow rate of the electronic oil pump 130. Since the electronic oil pump 130 cannot obtain the total flow rate required by the gearbox 190, the user, after obtaining the total flow rate required by the gearbox 190, inputs the flow rate demand into the electronic oil pump 130 as its target output flow rate.

[0088] This technical solution is a comprehensive control scheme for the lubrication system of a high-speed, heavy-duty transmission, including the starting control method of the electronic oil pump, the calculation of the total lubrication flow required by the transmission (190), and the calculation method of the actual output flow of the electronic oil pump. This technical solution has advantages such as more reasonable matching of the oil pump and motor, better lubrication effect, lower system energy consumption, and higher accuracy in lubrication flow control. Specifically, it includes:

[0089] Firstly, high-speed, heavy-duty transmissions typically use high-viscosity lubricating oil, especially at low temperatures, where its viscosity increases significantly, reaching over 4500 cst at 0°C. This places high demands on the low-temperature starting performance of the electronic oil pump. If the starting speed or speed ramp rate is too high at low temperatures, it can lead to electronic oil pump overload, causing damage. Furthermore, the low-temperature environment necessitates a higher-power electronic oil pump to meet the excessively high starting speed and speed ramp rate. However, the lubrication flow requirement under low-temperature conditions is minimal, making the use of a high-power electronic oil pump prohibitively expensive. Therefore, this technical solution addresses the problem of electronic oil pump overload at low temperatures by developing control strategies for the pump's starting speed and speed ramp rate based on the lubricating oil viscosity and system lubrication flow requirements at different temperatures. This approach effectively reduces costs while meeting the system's lubrication flow requirements at varying temperatures.

[0090] Secondly, for transmissions, the lubrication flow required by internal gears and bearings is directly related to the transmission's input power, torque, and speed; the higher the input power, the greater the lubrication flow required. However, even with the same input power, the required lubrication flow varies depending on the real-time torque and speed. In existing technologies, due to cost and installation considerations, transmission lubrication systems generally do not use flow sensors, relying solely on oil pump speed to control the lubrication flow, resulting in low flow control accuracy. This is mainly because lubrication pumps are typically fixed-displacement pumps; the actual output flow = speed × displacement × volumetric efficiency. While speed control is relatively precise, volumetric efficiency changes dynamically during actual operation, and varies significantly under different oil temperatures and pressures, making it difficult to obtain accurate volumetric efficiency. This leads to a large error between the actual output flow and the required flow. Therefore, the calculation of the transmission's lubrication flow requirement is usually a fixed flow or uses only the speed of the input lubrication motor (electronic oil pump) as a calculation parameter, resulting in inaccurate calculation of the actual lubrication flow and a mismatch between the actual supply flow and the actual flow.

[0091] Since the input power, torque, and speed of the electric transmission originate from the drive motor, this technical solution determines the required flow rate of the transmission lubrication system based on the output characteristics of the drive motor. First, the system is divided into zones according to the output characteristics of the drive motor. Then, the maximum required lubrication flow rate of the transmission in each zone is calculated based on power, torque, and speed, and these values ​​are used as the target lubrication flow rate for each zone. In actual operating condition control, the target zone of the transmission in the characteristic graph is determined based on the real-time acquired torque and speed of the transmission's drive motor. The maximum required flow rate of the transmission in the target zone is then determined, thereby determining the target lubrication flow rate of the electronic oil pump. This method of determining the target output flow rate based on the real-time speed, real-time torque, and output characteristic graph of the transmission's drive motor can accurately determine the real-time maximum flow requirement of the transmission, thereby accurately determining the output flow rate of the electronic oil pump. Furthermore, while meeting lubrication requirements, it can also reduce system energy consumption and improve efficiency.

[0092] After accurately calculating the target output flow rate of the electronic oil pump, the output speed of the electronic oil pump needs to be adjusted to a certain value to output the corresponding target output flow rate. To accurately calculate this "certain value," this technical solution addresses the two main factors affecting volumetric efficiency: oil temperature and pressure. First, the output flow rate of the oil pump at different temperatures, speeds, and pressures is obtained through oil pump bench testing, forming a flow rate MAP (output flow rate at different temperatures, pressures, and speeds) for the electronic oil pump. This flow rate MAP represents the actual flow output characteristics of the electronic oil pump and is then preset in the oil pump controller. In actual flow control, the speed of the electronic oil pump is determined based on the current oil temperature, oil pressure signal, required flow rate, and the preset flow rate MAP, and then the pump speed is controlled. This implementation method not only accurately controls the oil pump according to the actual flow rate required by the system, thus achieving on-demand lubrication flow, but also precisely controls the output flow rate of the oil pump based on oil temperature, oil pressure signal, and speed, thereby meeting lubrication requirements while reducing energy consumption and improving efficiency.

[0093] This application provides a storage medium storing a program that, when executed by a controller, implements the above-described control method for an electronic oil pump.

[0094] This application provides a controller for running a program, wherein the program executes the above-described control method for an electronic oil pump.

[0095] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 6 As shown. The computer device includes a controller A01, a network interface A02, a memory (not shown), and a database (not shown) connected via a system bus. The controller A01 provides computing and control capabilities. The memory includes internal memory A03 and a non-volatile storage medium A04. The non-volatile storage medium A04 stores an operating system B01, a computer program B02, and a database (not shown). The internal memory A03 provides an environment for the operation of the operating system B01 and the computer program B02 stored in the non-volatile storage medium A04. The database stores control data for the electric oil pump. The network interface A02 communicates with external terminals via a network connection. When the computer program B02 is executed by the controller A01, it implements a control method for the electric oil pump.

[0096] Those skilled in the art will understand that Figure 6The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0097] This application provides an apparatus including a controller, a memory, and a program stored in the memory and executable on the controller. When the controller executes the program, it implements a control method for an electronic oil pump.

[0098] This application also provides a computer program product that, when executed on a data processing device, is adapted to execute a program having initialization steps for a control method for an electronic oil pump.

[0099] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0100] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a controller of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the controller of the computer or other programmable data processing apparatus, generate instructions for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0101] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0102] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0103] In a typical configuration, a computing device includes one or more controllers (CPUs), input / output interfaces, network interfaces, and memory.

[0104] Memory may include non-persistent memory in computer-readable media, such as random access memory (RAM) and / or non-volatile memory, such as read-only memory (ROM) or flash RAM. Memory is an example of computer-readable media.

[0105] Computer-readable media includes both permanent and non-permanent, removable and non-removable media that can store information using any method or technology. Information can be computer-readable instructions, data structures, modules of programs, or other data. Examples of computer storage media include, but are not limited to, phase-change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, CD-ROM, digital versatile optical disc (DVD) or other optical storage, magnetic tape, magnetic disk storage or other magnetic storage devices, or any other non-transferable medium that can be used to store information accessible by a computing device. As defined herein, computer-readable media does not include transient computer-readable media, such as modulated data signals and carrier waves.

[0106] It should also be noted that the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus. Unless otherwise specified, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes that element.

[0107] The above are merely embodiments of this application and are not intended to limit the scope of this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the scope of the claims of this application.

Claims

1. A control method for an electronic oil pump, characterized in that, The system is applied to a lubrication system, which includes an electronic oil pump, an oil reservoir, and a transmission. The oil reservoir stores lubricating oil from inside the transmission, and the electronic oil pump pumps the lubricating oil from the oil reservoir to the transmission's lubrication channels. The control method includes: Obtain the real-time speed and real-time torque of the drive motor of the gearbox; The target output flow rate of the electronic oil pump is determined based on the real-time rotational speed and real-time torque. Obtain the real-time oil temperature and real-time operating pressure of the electronic oil pump; Based on a preset MAP, the target speed of the electronic oil pump is determined according to the target output flow rate, the real-time oil temperature, and the real-time working pressure. The preset MAP is generated based on multiple sample oil temperatures, multiple sample working pressures, multiple sample output flow rates, and multiple speeds of the electronic oil pump. The speed of the pump motor of the electronic oil pump is adjusted according to the target speed to adjust the actual output flow of the electronic oil pump to the target output flow. The acquisition of the real-time speed and real-time torque of the drive motor of the gearbox includes: The temperature of the lubricating oil in the oil tank is acquired in real time; The starting speed and slope of the electronic oil pump are determined based on the oil temperature. When the start-up time of the electronic oil pump reaches a preset time and the oil temperature of the lubricating oil in the oil tank is greater than a third preset temperature, the real-time speed and real-time torque of the drive motor of the gearbox are obtained. Wherein, when the oil temperature is greater than the first preset temperature and less than the second preset temperature, the electronic oil pump is controlled to start at a first speed, and the slope of the starting speed is the first slope. When the oil temperature is greater than or equal to the second preset temperature and less than the third preset temperature, the electronic oil pump is controlled to start at a second speed, and the slope of the starting speed is the second slope. When the oil temperature is greater than or equal to the third preset temperature and less than the fourth preset temperature, the electronic oil pump is controlled to start at a third speed, and the slope of the starting speed is the third slope. The first rotational speed is less than the second rotational speed, the second rotational speed is less than the third rotational speed, the first slope is less than the second slope, and the second slope is less than the third slope.

2. The control method for an electronic oil pump according to claim 1, characterized in that, Adjusting the speed of the electric oil pump motor according to the target speed to adjust the actual output flow of the electric oil pump to the target output flow includes: Adjust the speed of the oil pump motor to the target speed; Repeat the steps of obtaining the real-time oil temperature and real-time operating pressure of the electronic oil pump until the updated target speed is obtained; Adjust the speed of the oil pump motor to the updated target speed.

3. The control method for an electronic oil pump according to claim 1, characterized in that, The control method further includes: The sample output flow rate of the electronic oil pump is obtained under different test parameter sets, wherein the test parameter sets include the oil temperature of the lubricating oil in the oil tank, the working pressure of the electronic oil pump, and the speed of the oil pump motor of the electronic oil pump. A preset MAP diagram of the electronic oil pump is generated based on multiple test parameter groups and the sample output flow rate corresponding to each test parameter group.

4. The control method for an electronic oil pump according to claim 1, characterized in that, Determining the target output flow rate of the electronic oil pump based on the real-time rotational speed and real-time torque includes: The characteristic regions where the real-time speed and the real-time torque are located in the output characteristic diagram of the drive motor are determined, and the characteristic region is determined as the target region. The output characteristic diagram includes the characteristic curves of the drive motor at different speeds and torques, and each two adjacent characteristic curves constitute a characteristic region. Determine the maximum required flow rate of the transmission in the target area; The maximum required flow rate is determined as the target output flow rate of the electronic oil pump.

5. The control method for an electronic oil pump according to claim 4, characterized in that, Determining the maximum demand flow of the transmission in the target area includes: The characteristic curve with the larger speed and torque among the two characteristic curves corresponding to the target region is determined as the target characteristic curve. The target characteristic curve includes multiple operating points, and the speed and torque of the drive motor are different for each operating point. Obtain the required flow rate of the transmission at each operating point; The maximum demand flow rate is determined as the maximum demand flow rate of the gearbox within the target area.

6. The control method for an electronic oil pump according to claim 5, characterized in that, The target characteristic curve includes at least the operating points of the drive motor at its maximum torque, maximum power, and maximum speed. The maximum flow rate required by the drive motor at its operating points of maximum torque, maximum power, and maximum speed is the maximum flow rate required by the target area.

7. The control method for an electronic oil pump according to claim 4, characterized in that, The control method further includes: The output characteristic map of the drive motor is generated based on the correspondence between the drive motor of the gearbox at multiple speeds and torques. The output characteristic map includes at least the output characteristic curves of the drive motor at four different torque ranges. The output characteristic map is divided into multiple characteristic regions based on multiple output characteristic curves.

8. The control method for an electronic oil pump according to claim 1, characterized in that, The control method further includes: The electronic oil pump is prohibited from starting when the oil temperature is less than or equal to the first preset temperature; The electronic oil pump is allowed to start when the oil temperature is higher than the first preset temperature.

9. The control method for an electronic oil pump according to claim 1, characterized in that, Determining the target output flow rate of the electronic oil pump includes: Get the user-input traffic; The input flow rate is determined as the target output flow rate.

10. The control method for an electronic oil pump according to any one of claims 1 to 9, characterized in that, The lubrication system is the lubrication system for a high-speed, heavy-duty electric drive transmission.

11. A controller, characterized in that, It is configured to perform the control method for an electronic oil pump according to any one of claims 1 to 10.

12. A lubrication system, characterized in that, Includes the controller according to claim 11.

13. The lubrication system according to claim 12, characterized in that, The lubrication system is the lubrication system for a high-speed, heavy-duty electric drive transmission.

14. A machine-readable storage medium storing instructions thereon, characterized in that, When executed by the controller, the instruction causes the controller to be configured to perform the control method for an electronic oil pump according to any one of claims 1 to 10.

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