Electronic oil pump control method, oil filtering device and electric driving system

Abstract

The invention discloses an electronic oil pump control method, an oil filtering device and an electric drive system, and relates to the technical field of electric drive systems.The electronic oil pump comprises a pump body, a motor and a motor controller, the motor controller is connected with the motor, the motor is connected with the pump body, an oil suction opening is formed in the pump body, and a filter screen structure is arranged at the oil suction opening; the filter screen structure corresponds to the oil suction port; the electronic oil pump control method comprises the steps that the detection current and the real-time rotating speed of an electronic oil pump are obtained; determining a reference current corresponding to the real-time rotating speed according to the real-time rotating speed and a preset relation table; and if the electronic oil pump rotates in the forward direction and the detection current exceeds the threshold value of the reference current, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction so as to clean impurities of the filter screen structure. The effects that the filter screen is automatically cleaned, and the phenomenon that the filter screen structure is blocked by impurities and consequently the oil pump is blocked is avoided are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric drive systems, and particularly relates to an electronic oil pump control method, an oil filtering device and an electric drive system. BACKGROUND

[0002] During the operation of the electric drive assembly, the oil pump is a key cooling component to ensure that the electric drive assembly effectively dissipates heat under high load. However, during long-term operation, impurity particles of different sizes may be generated in the oil in the electric drive assembly, and when these particles accumulate in the oil pump, especially at the oil inlet of the oil pump, the oil pump may be blocked, affecting the operation efficiency of the cooling system of the electric drive assembly, and even causing system failure of the electric drive assembly. Therefore, how to effectively prevent the cooling system from being disabled due to blockage of the oil pump by impurities is a technical problem to be solved in the electric drive technology. SUMMARY

[0003] The main purpose of the present application is to provide an electronic oil pump control method, an oil filtering device and an electric drive system, which aims to solve the technical problem of how to effectively prevent the cooling system from being disabled due to blockage of the oil pump by impurities.

[0004] To achieve the above-mentioned purpose, the present application provides an electronic oil pump control method, the electronic oil pump comprising a pump body, a motor and a motor controller, the motor controller being connected with the motor, the motor being connected with the pump body, the pump body being provided with an oil suction port, the oil suction port being provided with a filter screen structure, the filter screen structure being correspondingly arranged with the oil suction port; the electronic oil pump control method comprising: obtaining a detection current and a real-time rotating speed of the electronic oil pump; determining a reference current corresponding to the real-time rotating speed according to the real-time rotating speed and a preset relationship table; if the detection current exceeds the threshold value of the reference current when the electronic oil pump rotates in the positive direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure.

[0005] In an embodiment, the motor controller comprises a current sensor; obtaining the detection current of the electronic oil pump comprises: obtaining the detection current of the electronic oil pump by the current sensor.

[0006] In an embodiment, if the detection current exceeds the threshold value of the reference current when the electronic oil pump rotates in the positive direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure, comprising: comparing the detection current with the threshold value of the reference current; If the detection current is greater than the threshold value of the reference current, it is determined that the state of the electronic oil pump is abnormal, and the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure, otherwise, it is determined that the state of the electronic oil pump is normal.

[0007] In an embodiment, if the detection current exceeds the threshold value of the reference current when the electronic oil pump rotates in the forward direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure, including: Comparing the difference between the detection current and the reference current with a preset deviation value; If the difference is greater than the preset deviation value, it is determined that the state of the electronic oil pump is abnormal, and the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure, otherwise, it is determined that the state of the electronic oil pump is normal.

[0008] In an embodiment, if the detection current exceeds the threshold value of the reference current when the electronic oil pump rotates in the forward direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure, including: If the corresponding detection current exceeds the threshold value of the reference current when the electronic oil pump rotates in the forward direction at multiple different speeds, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure.

[0009] In an embodiment, controlling the electronic oil pump to rotate in the reverse direction includes: Controlling the electronic oil pump to rotate in the reverse direction for a preset time length.

[0010] In an embodiment, the side of the filter screen structure away from the oil suction port is provided with a pollution receiving structure; The motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure, including: The motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure, including:

[0011] To achieve the above-mentioned purpose, the application also provides an oil filtering device applied to an electric drive system, the oil filtering device comprising: An electronic oil pump, the electronic oil pump comprising a pump body, a motor and a motor controller, the motor controller being connected with the motor, the motor being connected with the pump body, and the pump body being provided with an oil suction port; A filter screen structure, which is correspondingly arranged at the oil suction port; The motor controller is used to realize the steps of the electronic oil pump control method.

[0012] In an embodiment, the pump body is provided with a front end cover, and the oil suction port is arranged on the front end cover; The filter screen structure comprises a frame and a first filter screen, the frame is connected to the front end cover, the first filter screen is arranged on the frame and corresponds to the oil suction port, and the gap between the frame and the front end cover is less than or equal to the filtering accuracy of the first filter screen.

[0013] In an embodiment, the oil filter device further comprises: A pollution receiving structure is arranged on the side of the filter screen structure away from the oil suction port.

[0014] In an embodiment, the pollution receiving structure comprises a support frame and a magnetic component, one end of the support frame is connected to the frame, and the magnetic component is connected to the support frame.

[0015] In an embodiment, the magnetic component is fixedly connected to the support frame or is integrally formed with the support frame.

[0016] In addition, in order to achieve the above-mentioned purpose, the application further provides an electric drive system comprising the oil filter device as described above.

[0017] The one or more technical solutions provided by the application have at least the following technical effects: An electronic oil pump control method is provided, the electronic oil pump comprising a pump body, a motor and a motor controller, the motor controller being connected to the motor, the motor being connected to the pump body, a filter screen structure being arranged at an oil suction port of the pump body, and the filter screen structure corresponding to the oil suction port; after the motor controller obtains a detection current and a real-time rotating speed of the electronic oil pump, a corresponding reference current is determined according to the real-time rotating speed and a preset relationship table, if the detection current exceeds the threshold value of the reference current when the electronic oil pump rotates in a positive direction, the motor controller sends a signal and controls the electronic oil pump to rotate in a reverse direction, so as to clean impurities of the filter screen structure, realize the function of automatically cleaning the filter screen, prevent the electronic oil pump from being blocked from rotating due to the impurities blocking the filter screen structure, and thus avoid affecting the cooling effect of the electric drive system; and compared with the way of separately arranging an oil filter in the related art, the filter screen structure is directly arranged at the oil suction port of the pump body to filter oil impurities, and the way of avoiding blocking the filter screen not only avoids occupying too much space, but also reduces the cost under the condition of ensuring the oil flow efficiency in the pump body, and improves the working efficiency of the electronic oil pump. BRIEF DESCRIPTION OF DRAWINGS

[0018] The accompanying drawings, which are incorporated into and form part of the specification, illustrate embodiments consistent with the present application and, together with the specification, serve to explain the principles of the application.

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the application or the related art, the accompanying drawings needed to be used in the embodiments or related art description will be briefly introduced. Obviously, for those skilled in the art, other drawings can also be obtained without creative labor based on these drawings.

[0020] Figure 1 Structure diagram of an oil filtering device according to an embodiment of the present application; Figure 2 Flow diagram of an electronic oil pump control method according to an embodiment of the present application; Figure 3 Structure diagram of a front end cover of a pump body in an oil filtering device according to another embodiment of the present application; Figure 4 Structure diagram of a filter screen structure in an oil filtering device according to another embodiment of the present application; Figure 5 Sectional view diagram of a filter screen structure in an oil filtering device according to another embodiment of the present application; Figure 6 Sectional view diagram of part of a structure of an oil filtering device according to yet another embodiment of the present application; Figure 7 Structure diagram of part of an oil filtering device according to still another embodiment of the present application.

[0021] Explanation of reference numerals: 10, filter screen structure; 11, frame; 111, oil passage; 112, insertion slot; 113, mounting port; 12, first filter screen; 121, connecting section; 122, folding section; 13, second filter screen; 20, pump body; 21, front end cover; 211, oil suction port; 30, connecting structure; 31, buckle; 32, clamping groove; 40, contaminant receiving structure; 41, support frame; 42, magnetic component.

[0022] The implementation, functional features and advantages of the present application will be further described in conjunction with the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0023] It should be understood that the specific embodiments described herein are merely intended to explain the technical solutions of the present application, and are not intended to limit the present application. In order to better understand the technical solutions of the present application, the specific embodiments will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0024] During the operation of the electric drive assembly, the oil pump is a key cooling component to ensure that the electric drive assembly can effectively dissipate heat under high load. However, during long-term operation, impurity particles of different sizes may be generated in the oil in the electric drive assembly, and when these particles accumulate in the oil pump, especially at the oil inlet of the oil pump, the oil pump may be blocked, which affects the operation efficiency of the cooling system of the electric drive assembly, and even causes system failure of the electric drive assembly. Therefore, how to prevent the oil pump from being blocked by impurities to cause the cooling system to fail is an important problem in electric drive technology.

[0025] In the prior art, a filter is arranged at the front end of the oil pump to prevent the oil pump from being blocked. However, the filter occupies a large space, has a high cost and a large flow resistance, and is likely to reduce the efficiency of the oil pump.

[0026] Therefore, it is urgent to provide a solution for reducing the space occupied by the filtering system and ensuring long-term stable operation of the electric drive assembly while avoiding failure of the cooling system caused by blockage of the oil pump by impurities.

[0027] To solve the above problems, the embodiments of the present application provide a solution for optimizing the structure and software, and specifically provide an electronic oil pump control method, an oil filtering device and an electric drive system. The present application and the following embodiments will be described below with reference to the drawings.

[0028] The embodiments of the present application provide an electronic oil pump control method.

[0029] In an embodiment of the electronic oil pump control method of the present application, the electronic oil pump includes a pump body, a motor and a motor controller, the motor controller is connected with the motor, the motor is connected with the pump body, the electronic oil pump control method is applied to the motor controller, the motor controller can be a controller, a control module or a micro control unit in the oil filtering device of the electric drive system, or can be a module or a unit integrated in the main controller of the electric drive system, which is not limited here.

[0030] The oil filtering device can filter the oil for cooling and lubricating the motor and the reducer in the electric drive system, cool the filtered oil, and then deliver the cooled oil to the motor and the reducer for cooling and lubrication, that is, the oil filtering device can be the main part of the cooling system in the electric drive system.

[0031] Reference is made to Figure 1 , Figure 1 The structure schematic diagram of the oil filtering device provided in the embodiment is shown in the figure, in which the motor (not shown) is connected with the pump body 20, the pump body 20 is provided with an oil suction port 211, the filter screen structure 10 is arranged at the oil suction port 211, and the filter screen structure 10 is arranged corresponding to the oil suction port 211. Figure 1

[0032] Based on the above oil filtering device, the motor controller can implement the electronic oil pump control method of the embodiment. Reference is made to Figure 2 , Figure 2 The flowchart of the electronic oil pump control method of the embodiment of the present application is shown in the figure, which can include steps S10-S30. Step S10, obtaining the detection current and real-time speed of the electronic oil pump.

[0033] ​It should be noted that the detection current can be detected by setting a current transformer on the pump body and then sent to the motor controller, or detected by setting a current sensor inside the pump body and then sent to the motor controller, which is not specifically limited here. The real-time speed can be directly obtained by the motor controller according to its control of the electronic oil pump, or detected by an external detection device or sensor and then sent to the motor controller, which is not specifically limited here.

[0034] In a possible implementation, the motor controller comprises a current sensor; and the step S10 of obtaining the detection current of the electronic oil pump can comprise: obtaining the detection current of the electronic oil pump by the current sensor.

[0035] It should be noted that the current sensor is integrated into the motor controller, which can directly monitor the motor state inside the pump body and obtain the real-time current of the electronic oil pump with high detection accuracy. In specific applications, the current sensor sends the real-time collected current signal to the motor controller, so that the motor controller analyzes the current signal to obtain the current value, and thus obtains the detection current of the electronic oil pump.

[0036] Exemplarily, a PCB (Printed Circuit Board) is arranged in the pump body, and the current sensor can be arranged on the PCB.

[0037] In step S20, the reference current corresponding to the real-time speed is determined according to the real-time speed and a preset relationship table.

[0038] It should be noted that the preset relationship table comprises the corresponding relationship between different speeds and different currents, which can be stored in the motor controller in the form of a table, a curve or a model, etc. When the motor controller obtains the real-time speed, the corresponding speed in the preset relationship table is matched with the real-time speed, and the current corresponding to the speed is found, which can be used as the reference current corresponding to the real-time speed. The preset relationship table can be set according to the working parameters of the electronic oil pump and the working parameters of the electric drive system.

[0039] In step S30, if the detection current exceeds the threshold value of the reference current when the electronic oil pump rotates in the positive direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure.

[0040] It should be noted that when the electronic oil pump is running at the aforementioned real-time speed, if the oil flows smoothly, the current value of the electronic oil pump at this time should be theoretically the value corresponding to the reference current. However, if the filter screen structure of the electronic oil pump is blocked by too many impurities, the load of the electronic oil pump increases, and the current value will rise. Based on this, the state of the electronic oil pump can be judged by monitoring the change of the current value in real time and analyzing the difference between the real-time value and the theoretical value. The state of the electronic oil pump includes abnormality or normality when the filter screen is blocked. The abnormality when the filter screen is blocked can be manifested as that when the electronic oil pump rotates in the positive direction, the detection current exceeds the threshold value of the reference current. At this time, the electronic oil pump is blocked, and there are too many impurities on the filter screen structure, which causes the current of the electronic oil pump to abnormally rise. At this time, the backwashing function of the electronic oil pump needs to be started, and the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities on the filter screen structure.

[0041] In a feasible implementation, step S30 can include steps S311-S312: Step S311, compare the detection current with the threshold value of the reference current; Step S312, if the detection current is greater than the threshold value of the reference current, determine that the state of the electronic oil pump is abnormal, and the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities on the filter screen structure, otherwise, determine that the state of the electronic oil pump is normal.

[0042] It should be noted that under the abnormal condition of filter screen blockage, the real-time detection current is necessarily greater than the theoretical current. Based on this point, when the value of the detection current exceeds the threshold value of the reference current, it is determined that the state of the electronic oil pump is abnormal, that is, there is filter screen blockage, and the flow of oil in the pump body is limited. When the value of the detection current is less than or equal to the threshold value of the reference current, it is determined that the state of the electronic oil pump is normal, and the oil flows normally in the pump body.

[0043] For example, it is assumed that the preset relationship table contains the corresponding relationship between the speed and the current as shown in Table 1: Table 1

[0044] When the real-time speed Vt is V1, that is, Vt=V1, the reference current corresponding to the determined real-time speed Vt is A1, and the detection current At is compared with the reference current A1. If the detection current At is greater than the reference current A1, that is, At>A1, it is determined that the state of the electronic oil pump is abnormal. When the real-time speed Vt is V2, that is, Vt=V2, the reference current corresponding to the determined real-time speed Vt is A2, and the detection current At is compared with the reference current A2. If the detection current At is greater than the reference current A2, that is, At>A2, it is determined that the state of the electronic oil pump is abnormal.

[0045] Optionally, the reference current can be a threshold value or a range value; if the reference current is a range value, the detection current can be directly compared with the maximum value of the reference current, and if the detection current is greater than the maximum value of the reference current, it is determined that the state of the electronic oil pump is abnormal.

[0046] In this embodiment, the detection current is directly compared with the reference current, and once the detection current is greater than the reference current, it is automatically determined that the electronic oil pump is blocked, so as to start the backwashing function of the electronic oil pump. Specifically, the motor controller sends a signal and controls the electronic oil pump to rotate in the opposite direction to clean the impurities of the filter screen structure and clean the filter screen.

[0047] In another possible implementation, the step S30 can include steps S321-S322: Step S321, comparing the difference between the detection current and the reference current with a preset deviation value; Step S322, if the difference is greater than the preset deviation value, it is determined that the state of the electronic oil pump is abnormal, the motor controller sends a signal and controls the electronic oil pump to rotate in the opposite direction to clean the impurities of the filter screen structure, otherwise, it is determined that the state of the electronic oil pump is normal.

[0048] It should be noted that in the abnormal case of filter screen blockage, the real-time detected current is necessarily greater than the theoretical current. In addition, considering that when the filter screen is partially blocked, the real-time detected current can also be greater than the theoretical current, but at this time the influence on the operation of the electronic oil pump is not too large, so a margin value can be set, so that when the real-time detected current exceeds the theoretical current too much, i.e. when the filter screen is blocked seriously, the backwashing function of the electronic oil pump is started again. Based on the above two points, when the difference between the detection current and the reference current exceeds the preset deviation value, it is determined that the state of the electronic oil pump is abnormal, i.e. the filter screen is blocked, and the flow of oil in the pump body is limited; when the difference between the detection current and the reference current is less than or equal to the preset deviation value, it is determined that the state of the electronic oil pump is normal, and the oil in the pump body flows normally.

[0049] For example, assuming that the preset relationship table contains the corresponding relationship between the rotational speed and the current as shown in Table 1 in the above embodiment, when the real-time rotational speed Vt is V1, i.e., Vt = V1, the reference current corresponding to the real-time rotational speed Vt is determined to be A1, the difference At-A1 between the detection current At and the reference current A1 is compared with the preset deviation value N, and if the difference At-A1 is greater than the preset deviation value N, i.e., At-A1 > N (i.e., At > A1+N), it is determined that the state of the electronic oil pump is abnormal. When the real-time rotational speed Vt is V2, i.e., Vt = V2, the reference current corresponding to the real-time rotational speed Vt is determined to be A2, the difference At-A2 between the detection current At and the reference current A2 is compared with the preset deviation value N, and if the difference At-A2 is greater than the preset deviation value N, i.e., At-A2 > N (i.e., At > A2+N), it is determined that the state of the electronic oil pump is abnormal. The preset deviation value N is a positive number, which can be set according to actual needs.

[0050] Optionally, the preset deviation value can be a threshold value or a range value. If the preset deviation value is a range value, the difference between the detection current and the reference current can be directly compared with the maximum value of the preset deviation value, and if the difference is greater than the maximum value of the preset deviation value, it is determined that the state of the electronic oil pump is abnormal.

[0051] In this embodiment, the difference between the detection current and the reference current is compared with the preset deviation value, and if the detection current exceeds the reference current and exceeds a lot, i.e., the difference is greater than the preset deviation value, it is determined that the electronic oil pump is blocked, so that the backwashing function of the electronic oil pump is started. Specifically, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure and clean the filter screen. Compared with the previous embodiment, this embodiment increases the adjustability of the filter screen blockage, and the backwashing function is started only when the blockage is serious, thereby avoiding repeated start of the backwashing function and affecting the normal working efficiency of the electronic oil pump.

[0052] In another possible implementation, the step S30 can include a step S331: In the step S331, if the detection current corresponding to the electronic oil pump rotating in the positive direction at a plurality of different rotational speeds all exceeds the threshold value of the reference current, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure.

[0053] It should be noted that in the working process of the electronic oil pump, the speed may be continuously adjusted, and the corresponding detection current and the reference current will also change continuously. In order to accurately identify whether there is really an abnormal situation of filter screen blockage, the motor controller can collect the detection currents of the electronic oil pump in the positive direction rotation at multiple different speeds, and respectively compare each detection current with the threshold of the corresponding reference current. When the detection currents at the preset number of different speeds all exceed the threshold of the reference current, it can be determined that the state of the electronic oil pump is abnormal, so that the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure. On the contrary, if only one or two times or the detection current does not reach the preset number of times exceeds the threshold of the reference current, it can be determined that the state of the electronic oil pump is normal.

[0054] In this embodiment, whether the electronic oil pump is abnormal is judged by comparing the currents at multiple speeds, and the identification accuracy of filter screen blockage is higher.

[0055] The above are only three feasible embodiments of step S30 provided by the present embodiment, and the present embodiment does not specifically limit the specific embodiments of step S30.

[0056] In a feasible embodiment, the "controlling the electronic oil pump to rotate in the reverse direction" in step S30 can include: controlling the electronic oil pump to rotate in the reverse direction for a preset time length.

[0057] It should be noted that the preset time length can be set according to actual needs, which is not limited here. When starting the backwashing function of the electronic oil pump, the specific backwashing time length can be customized as needed to avoid insufficient reverse rotation time length, resulting in incomplete filter screen cleaning, or excessive reverse rotation time, affecting the working efficiency of the electronic oil pump and the working efficiency of the oil filter device. When the reverse rotation reaches the preset time length, the motor controller can continue to control the electronic oil pump to rotate in the positive direction, and switch to the normal working state of the electronic oil pump.

[0058] It can be understood that, on the basis of optimizing and improving the structure of the electronic oil pump, and combining the program optimization and improvement of the motor controller, the present embodiment proposes a anti-blocking design for preventing the electronic oil pump from failing due to impurity blockage in the long-term running process from two aspects of structure and software, realizes the anti-blocking performance of the electronic oil pump, can avoid the cooling performance of the electric drive system being invalid due to impurity blockage of the pump body, so as to ensure that the cooling efficiency of the electric drive system always remains in the best state, can improve the overall working efficiency of the electric drive system; and can reduce the occupied space of the oil filter device, and ensure the long-term stable operation of the electric drive system.

[0059] In a feasible embodiment, as Figure 2As shown, the filter screen structure 10 is provided with a dirt collection structure 40 away from one side of the oil suction port 211 in the oil filter device; the "motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure" in step S30 can include: the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction, so that the oil flowing out of the oil suction port 211 in the reverse direction can flush the impurities on the filter screen structure 10 into the dirt collection structure 40 for storage.

[0060] It should be noted that the motor controller controls the electronic oil pump to rotate in the reverse direction, and the oil flowing out of the oil suction port in the reverse direction can flush the impurities on the filter screen structure into the dirt collection structure for storage. By using the dirt collection structure to store the impurities, the filter screen can be cleaned and the normal operation of the electronic oil pump can be restored, and at the same time, the impurities can be prevented from repeatedly flowing in the pump body, thereby causing the filter screen structure to be blocked again.

[0061] The electronic oil pump control method provided in this embodiment includes the following steps: the electronic oil pump includes a pump body, a motor, and a motor controller, the motor controller is connected with the motor, the motor is connected with the pump body, the pump body is provided with a filter screen structure at an oil suction port, and the filter screen structure is correspondingly arranged at the oil suction port; after the motor controller obtains a detection current and a real-time rotating speed of the electronic oil pump, a corresponding reference current is determined according to the real-time rotating speed and a preset relationship table; if the detection current exceeds the threshold value of the reference current when the electronic oil pump rotates in the positive direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities of the filter screen structure, thereby realizing the function of automatically cleaning the filter screen, preventing the electronic oil pump from being blocked from rotating due to the impurities blocking the filter screen structure, and avoiding affecting the cooling effect of the electric drive system, and reducing the maintenance frequency of the electronic oil pump and improving the stability and reliability of the electronic oil pump; in addition, compared with the way of separately arranging an oil filter in the related art, the filter screen structure is directly arranged at the oil suction port of the pump body to filter the impurities of the oil, and the way of avoiding blocking the filter screen not only avoids occupying too much space, but also reduces the cost under the condition of ensuring the oil flow efficiency in the pump body, thereby improving the working efficiency of the electronic oil pump.

[0062] The oil filter device provided in this embodiment can be applied to the electric drive system.

[0063] In an embodiment of the oil filter device provided in this application, the oil filter device is applied to the electric drive system, for example, an electric vehicle. Figure 1 As shown, the oil filter device can include: The electronic oil pump includes a pump body 20, a motor, and a motor controller, the motor controller is connected with the motor, the motor is connected with the pump body 20, and the pump body 20 is provided with an oil suction port 211; The filter screen structure 10 is correspondingly arranged at the oil suction port 211. The motor controller is used to implement the steps of the electronic oil pump control method in the above-mentioned embodiments.

[0064] It should be noted that the pump body 20 is used to drive the oil flow, and since various impurities will inevitably occur in the oil during operation, the pump body 20 itself has robustness, and small particle impurities can pass through the pump body 20 and will not affect the performance of the electronic oil pump; but for large particle impurities, filtering is needed to prevent the pump body 20 from being blocked, so the filter screen structure 10 is used to filter the oil, that is, the filter screen structure 10 is used to preliminarily filter the oil to remove larger impurity particles in the oil. When the electronic oil pump responds to the control of the motor controller to execute the electronic oil pump control method to realize the backwashing function, the motor controller specifically sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities on the filter screen structure 10.

[0065] In a feasible implementation manner, as shown in Figure 1 The oil filtering device can further include: The pollution-accepting structure 40 is arranged on the side of the filter screen structure 10 away from the oil suction port 211.

[0066] It should be noted that the pollution-accepting structure 40 is arranged on the side of the filter screen structure 10 away from the oil suction port 211, that is, the pollution-accepting structure 40 is located at the upper end of the filter screen structure 10. When the electronic oil pump responds to the control of the motor controller to execute the electronic oil pump control method to realize the backwashing function, the motor controller can specifically send a signal and control the electronic oil pump to rotate in the reverse direction, so that the oil flowing out in the reverse direction through the oil suction port 211 flushes the filter screen structure 10. At this time, the pollution-accepting structure 40 is used to collect the flushed impurities, effectively store the filtered impurities, avoid the filter screen of the pump body 20 from being blocked, and affect the operation of the electronic oil pump.

[0067] It can be understood that the oil filtering device adopts the integrated design of the filter screen structure and the pollution-accepting structure, which can reduce the structural complexity of the device. The device is compact and easy to integrate, which is helpful for realizing compact arrangement in the electric drive system. Moreover, through automatic backwashing and storage of the pollution-accepting structure, the accumulation of impurities in the pump body is effectively reduced, the risk of locked-rotor of the electronic oil pump is reduced, and the service life of the electronic oil pump can be prolonged.

[0068] In the oil filtering device provided in the embodiment, the motor controller adopts the electronic oil pump control method in the above-mentioned embodiment, which can solve the technical problem of how to effectively prevent the oil pump from being blocked by impurities to cause the cooling system to fail. Compared with the related art, the oil filtering device provided in the present application has the same beneficial effects as the electronic oil pump control method provided in the above-mentioned embodiment, and other technical features in the oil filtering device are the same as the features disclosed in the electronic oil pump control method in the above-mentioned embodiment, which will not be described herein.

[0069] In another embodiment of the oil filtering device of the present application, the same or similar contents as in the above-mentioned embodiment can be referred to in the above introduction, and will not be described hereinafter. On this basis, refer to Figure 3 andFigure 4 , Figure 3 is a structural schematic view of a front end cover of a pump body in the embodiment, Figure 4 is a structural schematic view of a filter screen structure in the embodiment; as shown in the figure, Figure 3 The pump body 20 is provided with a front end cover 21, and an oil suction port 211 is arranged on the front end cover 21; as shown in the figure, Figure 4 The filter screen structure 10 includes a frame 11 and a first filter screen 12. The frame 11 is connected to the front end cover 21, and the first filter screen 12 is arranged in the frame 11 and corresponds to the oil suction port 211. The gap between the frame 11 and the front end cover 21 is less than or equal to the filtering accuracy of the first filter screen 12. In the related art, the oil suction filter is usually arranged at the front end cover of the oil pump to install the filter screen structure. In order to prevent impurities from entering the oil suction filter through the gap between the front end cover and the filter screen structure, a sealing ring structure needs to be additionally arranged between the front end cover and the filter screen structure. The sealing ring structure is prone to aging after long-term use, which leads to oil leakage and high maintenance and replacement costs. Therefore, the filter screen structure is improved in the embodiment to solve the problem of the sealing ring structure being prone to aging after long-term use, which leads to oil leakage and high maintenance and replacement costs.

[0070] It should be noted that the front end cover 21 is a component of the pump body 20. The frame 11 refers to a rigid frame for bearing the first filter screen 12, which can be implemented by an injection molding part, and is used to provide structural support and maintain the connection and positioning with the front end cover 21, and can also realize the plastic packaging of the edge of the first filter screen 12. The frame 11 is connected to the front end cover 21, and the assembly relationship between the frame 11 and the front end cover 21 can ensure the accurate position of the filter screen structure 10 in the oil circuit. The first filter screen 12 refers to a filtering medium formed by wire weaving or punching plate, which can be implemented by stacking layers of stainless steel mesh. The arrangement of the first filter screen 12 corresponding to the oil suction port 211 enables it to directly intercept impurity particles entering the pump body 20, and the corresponding arrangement of the oil suction port 211 and the first filter screen 12 of the filter screen structure 10 can optimize the oil flow path and reduce the flow resistance caused by the arrangement of the first filter screen 12.

[0071] The oil liquid filtering device provided in the embodiment can prevent impurities from flowing into the gap between the frame 11 and the front end cover 21 by making the gap between the frame 11 and the front end cover 21 less than or equal to the filtering accuracy of the first filter screen 12, so as to ensure the filtering effect of the filter screen structure 10, thereby eliminating the need to additionally arrange a sealing ring structure between the frame 11 and the front end cover 21, and eliminating the design of the sealing ring structure, thereby avoiding the problem that the sealing ring structure is prone to aging after long-term use, which leads to oil leakage and high maintenance and replacement costs.

[0072] In a feasible implementation manner, the first filter screen 12 is provided with a protruding portion in the axial height direction of the pump body 20.

[0073] In this way, the first filter screen 12 can be designed to increase the filtering area by utilizing the space in the axial height direction of the pump body 20, thereby meeting the large flow requirement in a small-volume oil filter device.

[0074] Preferably, the first filter screen 12 is at least partially folded in the direction from one side of the frame 11 to the other side to form a plurality of protruding portions.

[0075] The folded structure of the first filter screen 12 refers to a continuous undulating pleat structure in a single-axis direction, which is formed by a stamping forming process or a folding screen process to form regular wave crests and troughs, thereby forming an expanded filtering surface perpendicular to the fluid flow direction and increasing the effective filtering area. In actual applications, the plurality of wave crests in the continuous wavy folded structure of the first filter screen 12 can be equidistantly distributed or not. Of course, the equidistant distribution of the plurality of wave crests can make the oil flow uniformly through the first filter screen 12, effectively disperse the oil impact force, and reduce the risk of local blockage.

[0076] Specifically, the folded structure extends between the two sides of the frame 11 to form a plurality of interconnected filtering channels. When the oil flows through this area, the actual contact filtering area is significantly larger than the projected area of the flat filter screen due to the three-dimensional path formed by the wave crests and troughs. At the same time, the undulating shape of the folded filter screen guides the oil to produce turbulent flow, reduces the deposition of impurities on the filter screen surface, and avoids the impact of local blockage on the filtering efficiency. This structure expands the effective filtering area by using a three-dimensional filter screen while keeping the overall size of the frame 11 unchanged.

[0077] In this embodiment, the first filter screen is at least partially folded to form a plurality of protruding portions, which can effectively increase the actual filtering area in a limited space by using a three-dimensional structure, thereby increasing the oil flow rate without increasing the projected area of the filter screen, and effectively increasing the effective filtering area of the first filter screen under the same boundary size. That is, it can meet the large flow requirement without causing the overall size of the oil filter device to exceed the standard, thereby adapting to the layout of the compact electric drive system. In addition, the winding flow path formed by the folded structure can also enhance the turbulent flow effect of the oil, reduce the risk of impurity blockage, and maintain the compactness of the overall structure, thereby solving the technical contradiction between the need to increase the area of the traditional flat filter screen and the size exceeding the standard. This space-optimized folded filter screen structure realizes the dual technical effects of flow requirement and compact layout.

[0078] In one possible embodiment, as shown in FIG. 1, the first filter screen 12 is arranged in the oil inlet 21 of the pump body 20. Figure 3 and Figure 4As shown, the frame 11 is provided with an oil passing channel 111 for communicating with the oil suction port 211, and the first filter screen 12 is arranged in the oil passing channel 111.

[0079] It should be noted that the oil passing channel 111 refers to a fluid path arranged inside the frame 11 and communicating with the oil suction port 211, and the cross-sectional shape thereof can be rectangular, circular or other shapes, and can be formed by injection molding or machining. By limiting the flow of oil in the channel, the decrease in filtering efficiency caused by the dispersion of oil flow can be avoided.

[0080] In this embodiment, by arranging a dedicated oil passing channel inside the frame and directly integrating the first filter screen in the channel, the oil in the oil suction port must flow through the filter screen structure in the oil passing channel. This design forces the oil flow path to be constrained in a specific channel, avoiding the low filtering efficiency caused by the dispersion of oil flow, and at the same time, the channel structure reduces the horizontal space occupation of the filter screen assembly. The direct communication between the oil passing channel and the oil suction port ensures that the oil is filtered by the filter screen during the operation of the pump body, and the arrangement of the first filter screen inside the channel realizes the integrated integration of the filtering structure and the fluid channel, which not only guarantees the filtering effect but also optimizes the compactness of the overall structure.

[0081] In a feasible embodiment, referring to Figure 5 , Figure 5 is a sectional view of the filter screen structure in this embodiment; as shown, Figure 5 the first filter screen 12 includes a connecting section 121 and a folded section 122; the connecting section 121 is connected to the inner side wall of the oil passing channel 111; the folded section 122 is connected to the connecting section 121, and the folded section 122 is folded along the direction from one side of the frame 11 to the other side.

[0082] It should be noted that the connecting section 121 refers to a rigid support structure fixedly connected to the inner side wall of the oil passing channel 111, for fixing the folded section 122 in the oil flow path. The folded section 122 refers to a filtering cotton with a continuous undulating shape, which can form a wave-shaped wrinkle structure by stamping or injection molding process, for expanding the filtering area in a limited space.

[0083] In actual application, the connecting section 121 and the folded section 122 can both be structure sections with filter screen holes; or, only the folded section 122 can have structure sections with filter screen holes.

[0084] In this embodiment, the installation stability of the first filter screen is ensured by connecting the connecting section with the inner side wall of the oil passage, so as to avoid displacement or deformation caused by oil flow impact; the folded section is arranged in a wavy manner, so as to form a continuous and undulating filtering surface between the opposite sides of the frame, thereby significantly increasing the effective filtering area without increasing the overall size of the frame. The geometric shape of the wavy folded section not only adapts to the direction of oil flow, but also disperses the impact force of the oil, reduces the risk of local blockage, and improves the impurity capture efficiency through multidirectional folding, thereby meeting the requirements of compact layout and high flow.

[0085] In a feasible embodiment, as shown in Figure 5 the connecting section 121 is arranged in a circumferential direction of the oil passage 111, and the folded section 122 is connected to the inner side of the connecting section 121.

[0086] In actual application, the folded section 122 can be formed on the inner side of the connecting section 121 by using a stamping process. Before stamping, the filter screen structure 10 can be a flat net structure. In order to avoid breaking the filter screen structure 10 during stamping, the two sides of the filter screen structure 10 are first loosened, and a plurality of folded layers are punched out in the middle of the filter screen structure 10 by using a stamping mechanism, so as to form the connected connecting section 121 and folded section 122.

[0087] In this embodiment, the connecting section is arranged in a circumferential direction of the oil passage to form a ring structure, and the folded section is fixed to the inner side of the connecting section to form a circumferential fixation of the folded section, so as to improve the installation reliability of the folded section and keep the folded section stable in shape when bearing the oil pressure.

[0088] In a feasible embodiment, as shown in Figure 5 the inner side wall of the oil passage 111 is provided with a slot 112, the slot 112 is arranged in a circumferential direction of the oil passage 111, and the outer periphery of the connecting section 121 is inserted into the slot 112.

[0089] It should be noted that the slot 112 refers to a groove structure on the inner side wall of the oil passage 111, which can be formed by machining or injection molding, so as to package and encapsulate the part of the connecting section 121 away from the folded section 122, so that the outer periphery of the connecting section 121 is inserted into the slot 112.

[0090] In this embodiment, the outer periphery of the connecting section is embedded in the slot on the inner side wall of the oil passage, which is equivalent to packaging and encapsulating the edge of the first filter screen, so as to avoid damage to the pump body parts caused by burrs on the edge of the first filter screen, and also enhance the physical connection strength between the connecting section and the oil passage, and effectively prevent displacement and falling of the connecting section under oil pressure impact.

[0091] In a feasible embodiment, as shown inFigure 4 and Figure 5 As shown in FIG. 11 and FIG. 12, the side wall of the frame 11 is provided with a mounting port 113 connected with the oil passage 111, and the mounting port 113 is located at the periphery of the first filter screen 12; the filter screen structure 10 further comprises a second filter screen 13, which is arranged at the mounting port 113.

[0092] In this embodiment, the mounting port connected with the oil passage is arranged on the side wall of the frame, and the second filter screen is additionally arranged at the mounting port, thereby forming multiple filtering structures. The mounting port is arranged at the periphery of the first filter screen, so that the second filter screen can be arranged by using the three-dimensional space of the side wall of the frame, thereby avoiding the expansion of the planar area of the frame due to the increase of the number of filter screens. The first filter screen and the second filter screen are complementary in spatial distribution, the first filter screen increases the effective filtering area in the limited planar space by the folding structure, and the second filter screen expands the filtering area by lateral arrangement, and the two work cooperatively to improve the impurity interception capability and the oil treatment efficiency without increasing the structure volume.

[0093] In a feasible embodiment, as shown in FIG. 13 and FIG. 14, the second filter screen 13 is arranged in a radial direction along the oil passage 111. Figure 4 and Figure 5 As shown in FIG. 13 and FIG. 14, the second filter screen 13 is arranged in a radial direction along the oil passage 111.

[0094] It should be noted that the radial arrangement means that the layout direction of the second filter screen 13 is the same as the annular axis of the oil passage 111, and the annular frame or polygonal frame structure can be used to cover the surrounding area of the side wall of the frame 11 where the mounting port 113 is located.

[0095] In this embodiment, the second filter screen is arranged in the circumferential direction along the oil passage, thereby fully utilizing the mounting port area of the side wall of the frame in the limited space to form a circumferential filtering structure. The second filter screen arranged in the circumferential direction significantly increases the effective filtering area without occupying additional axial space, thereby improving the oil throughput and impurity capturing capability.

[0096] In another embodiment of the oil filtering device, the same or similar contents as the above embodiments can be referred to the above description, and will not be described hereinafter. On this basis, referring to FIG. 15 and FIG. 16, which are partial structure sectional views of this embodiment, the pollution collection structure 40 comprises a support frame 41 and a magnetic component 42, one end of the support frame 41 is connected with the frame 11, and the magnetic component 42 is connected with the support frame 41. Figure 6 , Figure 6 As shown in FIG. 15 and FIG. 16, the pollution collection structure 40 comprises a support frame 41 and a magnetic component 42, one end of the support frame 41 is connected with the frame 11, and the magnetic component 42 is connected with the support frame 41. Figure 6 Optionally, the magnetic component 42 is fixedly connected with the support frame 41 or is integrally formed with the support frame 41.

[0097]

[0098] ​It should be noted that the magnetic component 42 and the support frame 41 can be two components, which are connected by fixing the two components, for example, the magnetic component 42 is fixed at the other end of the support frame 41 away from the frame 11, and is arranged corresponding to the first filter screen 12; the magnetic component 42 can also be integrally formed with the support frame 41 to realize the connection.

[0099] It should be noted that the support frame 41 refers to a rigid frame for bearing the magnetic component 42, which can be realized by injection molding, for providing structural support and keeping one end connected and positioned with the frame 11, and the other end away from the frame 11 is connected and positioned with the magnetic component 42; the magnetic component 42 refers to a disc-shaped structure with magnetic adsorption function, which is arranged corresponding to the first filter screen 12, for example, a magnetic suction disc, which has the function of storing impurities, and the opposite sides of the magnetic component 42 can be provided with protruding pieces to facilitate the fixing connection of the protruding pieces with the other end of the support frame 41 away from the frame 11, so that the pollution collecting structure 40 has the effect of structural stability, especially when the electronic oil pump rotates in the opposite direction to flush the oil flowing out of the oil inlet 211 to the first filter screen 12, stably receiving the impurities flushed out of the first filter screen 12 and adsorbed on the magnetic component 42, especially for metal impurities in the oil, the effect is better; the magnetic component 42 can adsorb metal particles in the oil, improve the cleanliness of the oil, and avoid metal particles entering other components in the electric drive system to cause insulation failure. The magnetic component 42 can be a magnet, a magnetic mesh, etc.

[0100] The oil filtering device provided in the embodiment integrates the pollution collecting structure into the corresponding position of the filter screen structure, uses the magnetic adsorption performance of the magnetic component to store the impurities that block the first filter screen in the filter screen structure, and realizes the effect of cleaning the first filter screen; the pollution collecting structure is simple in structure, and the reverse flushing of the electronic oil pump is realized by controlling the electronic oil pump to rotate in the opposite direction by the motor controller, which realizes the effect of effectively preventing the electronic oil pump from blocking from both hardware and software.

[0101] In another embodiment of the oil filtering device of the present application, the same or similar contents as the above embodiments can be referred to the above introduction, and will not be described in detail. On this basis, continue to refer to Figure 6 The frame 11 is connected with the front end cover 21 in gap fit by the connecting structure 30.

[0102] It should be noted that the gap fit connection means that there is a preset gap between the frame 11 and the front end cover 21, which can be realized by adjusting the dimensional tolerance of the connecting structure 30 to accurately set the gap amount to be less than or equal to the filtering accuracy of the filter screen structure 10.

[0103] The oil filtering device provided by the embodiment has the connection structure, so that the gap fit connection between the frame and the front end cover is achieved, and the use of the sealing ring in the related art is replaced, thereby reducing the leakage risk and maintenance cost caused by the use of the sealing ring. In addition, the gap fit connection causes the controllable assembly gap between the frame and the front end cover, avoids the installation difficulty caused by the rigid connection, and prevents impurities from leaking from the connection through the control of the gap amount. The gap fit design can adapt to thermal expansion and contraction or vibration deformation under different working conditions while ensuring assembly precision, and improves the adaptability and reliability of the oil filtering device in a compact space.

[0104] In actual application, the connection structure 30 can be a structure of a buckle matched with a clamping groove, so that the frame 11 and the front end cover 21 are fixed by the buckle connection; or the connection structure 30 can also be a welding layer, so that the frame 11 and the front end cover 21 are fixed by welding; or the connection structure 30 can also be an adhesive layer, so that the frame 11 and the front end cover 21 are fixed by adhesion.

[0105] In a feasible implementation manner, as shown in Figure 6 , the connection structure 30 includes a buckle 31 and a clamping groove 32 matched with each other, one of the front end cover 21 and the frame 11 is provided with the buckle 31, and the other is provided with the clamping groove 32.

[0106] In actual application, the buckle 31 can be arranged at the side edge region of the frame 11, and the clamping groove 32 can be arranged at the inner side wall of the front end cover 21. When the frame 11 is pushed into the front end cover 21 along the axial direction, the buckle 31 is elastically deformed after contacting the entrance of the clamping groove 32, until it is completely embedded in the clamping groove 32 and returns to the original state, thereby forming an irreversible clamping fixation.

[0107] For example, refer to Figure 7 , Figure 7 partial structure schematic diagram of the embodiment; as shown in Figure 4 to Figure 7 , the side edge region of the frame 11 is provided with the buckle 31, and correspondingly, as shown in Figure 3 , the clamping groove 32 is arranged at the inner side wall of the front end cover 21. The cooperation of the buckle 31 and the clamping groove 32 can well fix the filter screen structure 10, can ensure that the filter screen structure 10 is stable during the operation of the electronic oil pump and does not produce axial movement, and can realize convenient integration and disassembly, thereby ensuring the stability and maintainability of the oil filtering device.

[0108] In the embodiment, the quick connection and accurate positioning between the frame and the front end cover are realized through the cooperation of the buckle and the clamping groove. The mutual matching structure of the buckle and the clamping groove enables the installation process to be free of complex operations, and the fixing can be completed through mechanical engagement, and the disassembly can be realized without tools, so that the maintenance efficiency is high, the connection reliability is ensured, the gap error that can be generated by the traditional threaded connection is avoided, and it can be ensured that the filter screen structure can be stably fixed at the oil suction port of the pump body during long-time work.

[0109] The embodiments of the present application also provide an electric drive system, which can comprise the oil filter device according to any of the above embodiments.

[0110] It should be noted that the specific structure of the oil filter device can refer to the above embodiments. Since the electric drive system adopts all the technical solutions of the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, and will not be repeated here.

[0111] The above is only part of the embodiments of the present application, and does not limit the protection scope of the present application. Any equivalent structural transformation, direct / indirect application in other related technical fields based on the technical concept of the present application and the content of the specification and drawings are included in the protection scope of the present application.

Claims

1. An electronic oil pump control method characterized by, The electronic oil pump includes a pump body, a motor, and a motor controller. The motor controller is connected to the motor, and the motor is connected to the pump body. The pump body is provided with an oil suction port, and a filter structure is provided at the oil suction port. The filter structure is provided corresponding to the oil suction port. The electronic oil pump control method includes: The detection current and real-time speed of the electronic oil pump are obtained; Based on the real-time rotation speed and the preset relationship table, determine the reference current corresponding to the real-time rotation speed; If the detected current exceeds the threshold of the reference current when the electronic oil pump rotates in the forward direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities in the filter structure.

2. The electronic oil pump control method according to claim 1, characterized by, The motor controller includes a current sensor; The step of obtaining the detection current of the electronic oil pump includes: The current of the electronic oil pump is obtained through the current sensor.

3. The electronic oil pump control method according to claim 1, characterized by, If the detected current exceeds the threshold of the reference current when the electronic oil pump rotates in the forward direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean impurities from the filter structure, including: The detected current is compared with a threshold value of the reference current; If the detected current is greater than the threshold of the reference current, the electronic oil pump is determined to be in an abnormal state. The motor controller sends a signal and controls the electronic oil pump to rotate in the opposite direction to clean the impurities in the filter structure. Otherwise, the electronic oil pump is determined to be in a normal state.

4. The electronic oil pump control method according to claim 1, characterized by, If the detected current exceeds the threshold of the reference current when the electronic oil pump rotates in the forward direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean impurities from the filter structure, including: The difference between the detected current and the reference current is compared with a preset deviation value; If the difference is greater than the preset deviation value, the state of the electronic oil pump is determined to be abnormal. The motor controller sends a signal and controls the electronic oil pump to rotate in the opposite direction to clean the impurities in the filter structure. Otherwise, the state of the electronic oil pump is determined to be normal.

5. The electronic oil pump control method according to claim 1, characterized by, If the detected current exceeds the threshold of the reference current when the electronic oil pump rotates in the forward direction, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean impurities from the filter structure, including: If the detected current exceeds the threshold of the reference current when the electronic oil pump rotates in the forward direction at multiple different speeds, the motor controller sends a signal and controls the electronic oil pump to rotate in the reverse direction to clean the impurities in the filter structure.

6. The electronic oil pump control method according to claim 1, characterized by The control of the electronic oil pump to rotate in the opposite direction includes: The electronic oil pump is controlled to rotate in the opposite direction for a preset duration.

7. The electronic oil pump control method according to any one of claims 1 to 6, characterized by, The filter structure has a dirt-collecting structure on the side away from the oil inlet; The motor controller sends a signal and controls the electronic oil pump to rotate in the opposite direction to clean impurities from the filter structure, including: The motor controller sends a signal and controls the electronic oil pump to rotate in the opposite direction, so that the oil flowing out in the opposite direction through the oil suction port washes the impurities on the filter structure into the dirt-collecting structure for collection.

8. An oil filter device characterized by comprising: The oil liquid filtering device is applied to an electric drive system and comprises: An electronic oil pump, the electronic oil pump comprising a pump body, a motor and a motor controller, the motor controller being connected with the motor, the motor being connected with the pump body, and the pump body being provided with an oil suction port; A filter screen structure is correspondingly arranged at the oil suction port; The motor controller is used to realize the steps of the electronic oil pump control method according to any one of claims 1 to 7.

9. The oil filter assembly of claim 8 wherein, The pump body is provided with a front end cover, and the oil suction port is arranged at the front end cover. The filter screen structure comprises a frame and a first filter screen, the frame is connected with the front end cover, the first filter screen is arranged on the frame and is correspondingly arranged with the oil suction port, and the gap between the frame and the front end cover is less than or equal to the filtering precision of the first filter screen.

10. The oil filter assembly of claim 9 wherein, The oil liquid filtering device further comprises: A pollution absorption structure is arranged on the side of the filter screen structure away from the oil suction port.

11. The oil filter assembly of claim 10 wherein, The pollution absorption structure comprises a support frame and a magnetic component, one end of the support frame is connected with the frame, and the magnetic component is connected with the support frame.

12. The oil filter assembly of claim 11 wherein, The magnetic component is fixedly connected with the support frame or is integrally formed with the support frame.

13. An electric drive system, characterized by The oil liquid filtering device according to any one of claims 8 to 12 is comprised.

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