Oil-cooled electric drive oil pump control method and system

Abstract

An oil-cooled electric drive oil pump control method and system. The control method comprises: acquiring a plurality of preset temperature control target reference values of a current oil-cooled electric drive oil pump; correcting a temperature control target value to obtain an output temperature control target value; on the basis of the current output temperature control target value, determining the rotational speed of the oil-cooled electric drive oil pump; acquiring a current temperature of a motor of the oil-cooled electric drive oil pump; determining the rotational speed change rate of the oil-cooled electric drive oil pump; acquiring a maximum peak rotational speed of the oil-cooled electric drive oil pump; determining a corrected rotational speed of the oil-cooled electric drive oil pump; and on the basis of the corrected rotational speed and the rotational speed change rate, determining an output rotational speed of the oil-cooled electric drive oil pump.

Description

Oil-cooled electric drive oil pump control method and system

[0001] This application claims priority to Chinese Patent Application No. 202410820865.6, filed on June 24, 2024, the contents of which are incorporated herein by reference in its entirety. TECHNICAL FIELD

[0002] The present application relates to the field of automobile technology, in particular to an oil-cooled electric drive oil pump control method and system. BACKGROUND

[0003] Currently, there are mainly the following ways for oil pump control strategy in the market: control according to the rated speed of the oil pump, which is relatively simple but has large energy consumption of the oil pump and obvious NVH problem; obtaining the working mode of the vehicle, the heating power of the motor, the inlet oil temperature of the radiator and the motor speed, when the working mode is any one of the torque mode, the pulse heating mode and the direct current boosting mode, the first oil pump speed under the corresponding working mode is determined according to the heating power of the motor and the inlet oil temperature of the radiator; the second oil pump speed is determined according to the motor speed and the inlet oil temperature of the radiator, and the larger value of the first oil pump speed and the second oil pump speed is taken as the target demand speed of the oil pump. This control method mainly relies on the data of the previous calibration for control. If there is a large scatter for the batch production product, it is easy to cause the motor to overheat. TECHNICAL PROBLEM

[0004] The purpose of the present application is to provide an oil-cooled electric drive oil pump control method and system, which solves the problems of large energy consumption of the oil pump and NVH. TECHNICAL SOLUTION

[0005] In order to achieve the above-mentioned purpose, the present application provides an oil-cooled electric drive oil pump control method, which comprises:

[0006] obtaining a plurality of preset temperature control target reference values of a current oil-cooled electric drive oil pump;

[0007] correcting the temperature control target value according to the plurality of preset temperature control target reference values to obtain an output temperature control target value;

[0008] determining the speed of the oil-cooled electric drive oil pump according to the current output temperature control target value;

[0009] obtaining the current temperature of the motor of the oil-cooled electric drive oil pump;

[0010] determining the speed change rate of the oil-cooled electric drive oil pump according to the plurality of preset temperature reference values, the current temperature and the speed of the oil-cooled electric drive oil pump;

[0011] obtaining the maximum peak speed of the oil-cooled electric drive oil pump;

[0012] determining a corrected rotation speed of the oil-cooled electrically-driven oil pump according to the maximum peak rotation speed of the oil-cooled electrically-driven oil pump;

[0013] determining an output rotation speed of the oil-cooled electrically-driven oil pump according to the corrected rotation speed and the rotation speed change rate.

[0014] In an embodiment, the preset plurality of temperature control target reference values comprises a first preset temperature control target value and a second preset temperature control target value, and the second preset temperature control target value is greater than the first preset temperature control target value.

[0015] In an embodiment, the correcting the temperature control target value according to the preset plurality of temperature control target reference values to obtain an output temperature control target value comprises:

[0016] determining whether the current temperature control target value is equal to a last temperature control target value;

[0017] in a case where the current temperature control target value is equal to the last temperature control target value, the output temperature control target value is the current temperature control target value;

[0018] in a case where the current temperature control target value is not equal to the last temperature control target value, determining whether the current temperature control target value is greater than the last temperature control target value;

[0019] in a case where the current temperature control target value is greater than the last temperature control target value, the output temperature control target value is the second preset temperature control target value;

[0020] in a case where the current temperature control target value is less than the last temperature control target value, determining whether the current temperature of the motor is greater than the first preset temperature control target value;

[0021] in a case where the current temperature of the motor is greater than the first preset temperature control target value, the output temperature control target value is the second preset temperature control target value;

[0022] in a case where the current temperature of the motor is less than the first preset temperature control target value, the output temperature control target value is the first preset temperature control target value.

[0023] In an embodiment, the determining the rotation speed of the oil-cooled electrically-driven oil pump according to the current output temperature control target value comprises:

[0024] determining whether the current temperature of the motor is greater than a third preset temperature control target value;

[0025] in a case where the current temperature of the motor is less than the third preset temperature control target value, the oil pump rotation speed is the last output oil pump rotation speed;

[0026] In a case where the current temperature of the motor is greater than a third preset temperature control target value, the oil pump speed is increased to a maximum peak speed at a speed of 50 rpm / s or 100 rpm / s, and the current temperature of the motor is stabilized within the output temperature control target value.

[0027] In an embodiment, the preset plurality of temperature reference values include a first preset temperature value and a second preset temperature value, and the second preset temperature value is greater than the first preset temperature value.

[0028] In an embodiment, the speed change rate of the oil-cooled electric drive oil pump is determined according to the preset plurality of temperature reference values, the current temperature, and the speed of the oil-cooled electric drive oil pump, including:

[0029] determining whether the current temperature of the motor is less than the first preset temperature value;

[0030] In a case where the current temperature of the motor is less than the first preset temperature value, determining whether the current oil pump speed is less than a first preset speed;

[0031] In a case where the current oil pump speed is less than the first preset speed, the speed change rate of the oil-cooled electric drive oil pump is accelerated to a first speed value;

[0032] In a case where the current oil pump speed is greater than the first preset speed, the speed change rate of the oil-cooled electric drive oil pump is slowed down to a second speed value.

[0033] In an embodiment, the speed change rate of the oil-cooled electric drive oil pump is determined according to the preset plurality of temperature reference values and the current temperature, including:

[0034] In a case where the current temperature of the motor is greater than the first preset temperature value, determining whether the current temperature of the motor is greater than a second preset temperature value;

[0035] In a case where the current temperature of the motor is greater than the second preset temperature value, the speed change rate of the oil-cooled electric drive oil pump is accelerated to a first speed value;

[0036] In a case where the current temperature of the motor is less than the second preset temperature value, the speed change rate of the oil-cooled electric drive oil pump is maintained at the last speed change rate of the oil-cooled electric drive oil pump.

[0037] In an embodiment, the corrected speed of the oil-cooled electric drive oil pump is determined according to the maximum peak speed of the oil-cooled electric drive oil pump, including:

[0038] obtaining an oil pump lubrication speed of the oil-cooled electric drive oil pump;

[0039] determining whether the current oil pump speed is greater than the oil pump lubrication speed;

[0040] In a case where it is judged that the current oil pump rotating speed is greater than the oil pump lubricating speed, the corrected rotating speed is the oil pump lubricating speed.

[0041] In a case where it is judged that the current oil pump rotating speed is less than the oil pump lubricating speed, it is judged whether the current oil pump rotating speed is greater than the maximum peak rotating speed of the oil pump.

[0042] In a case where it is judged that the current oil pump rotating speed is greater than the maximum peak rotating speed of the oil pump, the corrected rotating speed is the maximum peak rotating speed of the oil pump.

[0043] In an embodiment, the determining the current rotating speed of the oil-cooled electrically-driven oil pump according to the maximum peak rotating speed of the oil-cooled electrically-driven oil pump comprises: in a case where it is judged that the current oil pump rotating speed is less than the maximum peak rotating speed of the oil pump, the corrected rotating speed is the current oil pump rotating speed.

[0044] In another aspect, the application provides an oil-cooled electrically-driven oil pump control system, which comprises a controller configured to execute the control method according to any one of the above. Advantages

[0045] By the above technical solution, the temperature control target value can be compared with the last temperature control target value, and the temperature control target value can be corrected in real time according to the actual use environment. At the same time, the temperature control target value can be distinguished according to the motor loss difference, which can significantly reduce the oil pump rotating speed. The application also considers the control method in the tip in and tip out (rapidly stepping on or releasing the accelerator) situation, and the rising and falling slopes of the oil pump are controlled according to the current temperature of the oil-cooled electric motor, the preset plurality of temperature reference values, and the rotating speed of the oil-cooled electrically-driven oil pump through steps S4 and S5, so as to determine the rotating speed change rate of the oil pump. The application can effectively cool the oil-cooled electric motor system in real time with low energy consumption, can reduce the energy consumption of the oil pump, and can improve the NVH of the product. BRIEF DESCRIPTION OF DRAWINGS

[0046] The accompanying drawings are included to provide a further understanding of the application, and constitute a part of the specification, and are used together with the following detailed description to explain the application, but do not constitute a limitation on the application. In the drawings:

[0047] FIG. 1 is a flow chart of an oil-cooled electrically-driven oil pump control method according to an embodiment of the application;

[0048] FIG. 2 is a flow chart of an oil-cooled electrically-driven oil pump control method according to an embodiment of the application;

[0049] FIG. 3 is a flow chart of an oil-cooled electrically-driven oil pump control method according to an embodiment of the application;

[0050] FIG. 4 is a flow chart of an oil-cooled electrically-driven oil pump control method according to an embodiment of the present application;

[0051] FIG. 5 is a flow chart of an oil-cooled electrically-driven oil pump control method according to an embodiment of the present application. Embodiments of the present application

[0052] The specific embodiments of the present application will be described in detail hereinafter with reference to the drawings. It should be understood that the specific embodiments described herein are merely illustrative and explanatory and are not intended to limit the present application.

[0053] In the embodiments of the present application, the orientation words such as "upper", "lower", "top", "bottom" are generally used for the directions shown in the drawings or the positional relationships between the components in the vertical, perpendicular or gravity directions, unless otherwise specified.

[0054] In addition, if the present application has a description of "first", "second", etc., the description of "first", "second", etc. is only for the purpose of description and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features limited by "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of a person skilled in the art. When the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist and is not within the protection scope required by the present application.

[0055] As shown in FIG. 1, FIG. 1 is a flow chart of an oil-cooled electrically-driven oil pump control method according to an embodiment of the present application. In FIG. 1, the control method comprises the following steps:

[0056] In step S1, a plurality of preset temperature control target reference values of the current oil-cooled electrically-driven device are obtained;

[0057] In step S2, the temperature control target value is corrected according to the plurality of preset temperature control target reference values to obtain an output temperature control target value;

[0058] In step S3, the rotation speed of the oil-cooled electrically-driven oil pump is determined according to the current output temperature control target value;

[0059] In step S4, the current temperature of the motor of the oil-cooled electrically-driven oil pump is obtained;

[0060] In step S5, the rotation speed change rate of the oil-cooled electrically-driven oil pump is determined according to the plurality of preset temperature reference values, the current temperature of the motor and the rotation speed of the oil-cooled electrically-driven oil pump;

[0061] In step S6, the maximum peak speed of the oil-cooled electric-driven oil pump is obtained;

[0062] In step S7, the corrected speed of the oil-cooled electric-driven oil pump is determined according to the maximum peak speed of the oil-cooled electric-driven oil pump;

[0063] In step S8, the output speed of the oil-cooled electric-driven oil pump is determined according to the corrected speed and the speed change rate.

[0064] In this figure 1, step S2 is used to determine the output temperature control target value, so as to determine the speed of the oil-cooled electric-driven oil pump. In the prior art oil-cooled electric-driven control method, the control target of the motor temperature sensor is not defined, and in an embodiment of the present application, the temperature control target value can be compared with the last temperature control target value, and the temperature control target value can be corrected in real time according to the actual use environment. At the same time, according to the loss difference of the motor, the temperature control target value can be distinguished, which can significantly reduce the speed of the oil pump. The present application also considers the control method in the tip in and tip out (rapidly stepping on or releasing the accelerator) situation, and through steps S4 and S5, the current temperature of the motor of the oil-cooled electric-driven oil pump, the preset plurality of temperature reference values and the speed of the oil-cooled electric-driven oil pump are used to control the rising and falling slope of the oil pump, so as to determine the speed change rate of the oil pump.

[0065] In this embodiment, the temperature setting of the preset plurality of temperature control target reference values can be various temperature settings known to those skilled in the art, and in an embodiment of the present application, the preset plurality of temperature control target reference values include a first preset temperature control target value and a second preset temperature control target value, wherein the second preset temperature control target value is greater than the first preset temperature control target value. Specifically, the first preset temperature control target value and the second preset temperature control target value are obtained by looking up the motor torque and speed table, wherein the first preset temperature control target value is 120℃, and the second preset temperature control target value is 140℃.

[0066] In this embodiment, the way to obtain the output temperature control target value can be various ways known to those skilled in the art, and in an embodiment of the present application, as shown in figure 2, the output temperature control target value is determined by the following steps:

[0067] In step S201, it is judged whether the current temperature control target value is equal to the last temperature control target value;

[0068] In step S202, in the case where it is judged that the current temperature control target value is equal to the last temperature control target value, the output temperature control target value is the current temperature control target value;

[0069] In step S203, in the case where it is judged that the current temperature control target value is not equal to the last temperature control target value, it is judged whether the current temperature control target value is greater than the last temperature control target value;

[0070] In step S204, in the case where it is judged that the current temperature control target value is greater than the last temperature control target value, the output temperature control target value is the second preset temperature target value;

[0071] In step S205, in the case where it is judged that the current temperature control target value is less than the last temperature control target value, it is judged whether the current temperature of the motor is greater than the first preset temperature control target value;

[0072] In step S206, in the case where it is judged that the current temperature of the motor is greater than the first preset temperature target value, the output temperature control target value is the second preset temperature control target value;

[0073] In step S207, in the case where it is judged that the current temperature of the motor is less than the first preset temperature control target value, the output temperature control target value is the first preset temperature control target value.

[0074] In this embodiment, in the case where the current temperature control target value obtained by the table lookup is equal to the last output temperature control target value, the current output temperature control target value is unchanged, i.e., the output temperature control target value is the current temperature control target value; in the case where the current temperature control target value obtained by the table lookup is not equal to the last output temperature control target value, it is judged whether the current temperature control target value obtained by the table lookup is greater than the last output temperature control target value, in the case where the current temperature control target value obtained by the table lookup is less than the last output temperature control target value, it is judged whether the current temperature of the motor is greater than the first temperature control target value 120℃, in the case where the current temperature of the motor is greater than the first temperature control target value 120℃, the output temperature control target value is the second temperature control target value 140℃; in the case where the current temperature of the motor is less than the first temperature control target value 120℃, the output temperature control target value is the first temperature control target value 120℃.

[0075] In this embodiment, the manner of determining the rotation speed of the oil-cooled electrically-driven oil pump according to the output temperature control target value can be various manners known by those skilled in the art, in an embodiment of the present application, as shown in FIG. 3, the rotation speed of the oil-cooled electrically-driven oil pump is determined by the following steps:

[0076] In step S301, it is judged whether the current temperature of the motor is greater than the third preset temperature control target value;

[0077] In step S302, in the case where it is judged that the current temperature of the motor is less than the third preset temperature control target value, the rotation speed of the oil pump is the last output rotation speed of the oil pump;

[0078] In step S303, in the case where it is judged that the current temperature of the motor is greater than the third preset temperature control target value, the rotation speed of the oil pump is increased to the maximum peak rotation speed at a rotation speed of 50 rpm / s or 100 rpm / s, and the current temperature of the motor is stabilized within the output temperature control target value.

[0079] In the embodiment, the third preset temperature control target value is the output temperature control target value plus 3 DEG C. When the current temperature of the motor is greater than the third preset temperature control target value, the oil pump speed is increased to the maximum peak speed at a speed of 50 rpm / s or 100 rpm / s, and the current temperature of the motor is stabilized within the output temperature control target value. When the current temperature of the motor is less than the third preset temperature control target value, the oil pump speed is the last output oil pump speed.

[0080] In the embodiment, the plurality of preset temperature reference values can be various known by those skilled in the art. In an embodiment of the present application, the plurality of preset temperature reference values include a first preset temperature value and a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value. Specifically, in the present application, the first preset temperature value is 110 DEG C, and the second preset temperature value is 120 DEG C.

[0081] In the embodiment, the manner of determining the speed change rate of the oil-cooled electric drive oil pump according to the plurality of preset temperature reference values, the current temperature, and the speed of the oil-cooled electric drive oil pump can be various known by those skilled in the art. In an embodiment of the present application, as shown in FIG. 4, the specific steps of the manner of determining the speed change rate of the oil-cooled electric drive oil pump according to the plurality of preset temperature reference values, the current temperature, and the speed of the oil-cooled electric drive oil pump are as follows:

[0082] In step S501, it is determined whether the current temperature of the motor is less than the first preset temperature value.

[0083] In step S502, in the case where it is determined that the motor NTC temperature is less than the first preset temperature value, it is determined whether the current oil pump speed is less than the first preset speed.

[0084] In step S503, in the case where it is determined that the current oil pump speed is less than the first preset speed, the speed change rate of the oil-cooled electric drive oil pump is accelerated to the first speed value.

[0085] In step S504, in the case where it is determined that the current oil pump speed is greater than the first preset speed, the speed change rate of the oil-cooled electric drive oil pump is decelerated to the first speed value.

[0086] In step S505, in the case where it is determined that the current temperature of the motor is greater than the first preset temperature value, it is determined whether the current temperature of the motor is greater than the second preset temperature value.

[0087] In step S506, in the case where it is determined that the current temperature of the motor is greater than the second preset temperature value, the speed change rate of the oil-cooled electric drive oil pump is accelerated to the first speed value.

[0088] In step S507, in the case where it is judged that the current temperature of the motor is less than the second preset temperature value, the rotation rate variation of the oil-cooled electric drive oil pump is maintained as the rotation rate variation of the last oil-cooled electric drive oil pump.

[0089] In this embodiment, when the current temperature of the motor is less than the first preset temperature value 110℃, and the current oil pump rotation rate is less than the first preset rotation rate, the first preset rotation rate is 1000 rpm / s, the rotation rate variation of the oil-cooled electric drive oil pump is accelerated to the first rotation rate value, i.e., the rising and falling slopes of the oil pump rotation rate output are accelerated to the first rotation rate value, the first rotation rate value is 5000 rpm / s, otherwise, the rotation rate variation of the oil-cooled electric drive oil pump is decelerated to the second rotation rate value, i.e., the rising and falling slopes of the oil pump rotation rate output are decelerated to the second rotation rate value, the second rotation rate value is 500 rpm / s; when the current temperature of the motor is greater than the second preset temperature value 120℃, the rotation rate variation of the oil-cooled electric drive oil pump is accelerated to the first rotation rate value, i.e., the rising and falling slopes of the oil pump rotation rate output are accelerated to the first rotation rate value, otherwise, the rotation rate variation of the oil-cooled electric drive oil pump is maintained as the rotation rate variation of the last oil-cooled electric drive oil pump, i.e., the last rising and falling slopes are maintained.

[0090] In this embodiment, the way of how to determine the corrected rotation rate of the oil-cooled electric drive oil pump according to the maximum peak rotation rate of the oil-cooled electric drive oil pump can be various ways known by those skilled in the art, in one embodiment of the present application, as shown in FIG. 5, the specific steps of how to determine the corrected rotation rate of the oil-cooled electric drive oil pump according to the maximum peak rotation rate of the oil-cooled electric drive oil pump are as follows:

[0091] In step S701, the oil pump lubrication speed of the oil-cooled electric drive oil pump is obtained;

[0092] In step S702, it is judged whether the current oil pump rotation rate is greater than the oil pump lubrication speed;

[0093] In step S703, in the case where it is judged that the current oil pump rotation rate is greater than the oil pump lubrication speed, the corrected rotation rate is the oil pump lubrication speed;

[0094] In step S704, in the case where it is judged that the current oil pump rotation rate is less than the oil pump lubrication speed, it is judged whether the current oil pump rotation rate is greater than the maximum peak rotation rate of the oil pump;

[0095] In step S705, in the case where it is judged that the current oil pump rotation rate is greater than the maximum peak rotation rate of the oil pump, the corrected rotation rate is the maximum peak rotation rate of the oil pump;

[0096] In step S706, in the case where it is judged that the current oil pump rotation rate is less than the maximum peak rotation rate of the oil pump, the corrected rotation rate is the current oil pump rotation rate.

[0097] In this embodiment, the oil pump lubrication speed is related to the speed of the motor, and is obtained by looking up the lubrication MAP table. The speed of the motor is obtained by looking up the motor torque and rotational speed table. The maximum peak rotational speed is 4800 rpm / s.

[0098] The application also includes an oil-cooled electrically-driven oil pump control system, which comprises a controller configured to perform the control method described above.

[0099] Through the above technical solution, the control target of the motor temperature sensor is not defined in the oil-cooled electrically-driven control method in the prior art. In an embodiment of the application, a correctable temperature control target value is set, which can be compared with the last temperature control target value, and the temperature control target value is corrected in real time according to the actual use environment. At the same time, the temperature control target value can be distinguished according to the loss difference of the motor, which can significantly reduce the speed of the oil pump. The application also considers the control method in the tip in and tip out (rapidly stepping on or releasing the accelerator) situation, and steps S4 and S5 are used to control the rising and falling slopes of the oil pump according to the current temperature of the oil-cooled electrically-driven oil pump, the plurality of preset temperature reference values, and the speed of the oil-cooled electrically-driven oil pump, so as to determine the speed change rate of the oil pump.

[0100] The embodiments of the application are described in detail above in combination with the drawings, but the embodiments of the application are not limited to the specific details in the above-described embodiments. Within the technical concept range of the embodiments of the application, the technical solutions of the embodiments of the application can be subjected to various simple modifications, and these simple modifications all belong to the protection range of the embodiments of the application.

[0101] In addition, it should be noted that each specific technical feature described in the above-described specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again in the embodiments of the application.

[0102] In addition, various different embodiments of the embodiments of the application can also be combined in any appropriate manner, as long as they do not deviate from the idea of the embodiments of the application, and they should also be considered as disclosed in the embodiments of the application.

Claims

1. A control method for an oil-cooled electrically driven oil pump, wherein, The control method includes: Obtain multiple preset temperature control target reference values ​​for the current oil-cooled electric drive oil pump; The temperature control target value is corrected according to multiple preset temperature control target reference values ​​to obtain the output temperature control target value; The rotational speed of the oil-cooled electric drive oil pump is determined based on the current target output temperature value; Obtain the current temperature of the motor of the oil-cooled electric oil pump; The rate of change of the rotational speed of the oil-cooled electric pump is determined based on multiple preset temperature reference values, the current temperature, and the rotational speed of the oil-cooled electric pump. Obtain the maximum peak speed of the oil-cooled electric drive oil pump; The corrected speed of the oil-cooled electric drive oil pump is determined based on the maximum peak speed of the oil-cooled electric drive oil pump; The output speed of the oil-cooled electric drive oil pump is determined based on the corrected rotational speed and the rate of change of rotational speed.

2. The control method according to claim 1, wherein, The preset multiple temperature control target reference values ​​include a first preset temperature control target value and a second preset temperature control target value, wherein the second preset temperature control target value is greater than the first preset temperature control target value.

3. The control method according to claim 2, wherein, The step of correcting the temperature control target value based on multiple preset temperature control target reference values ​​to obtain the output temperature control target value includes: Determine whether the current temperature control target value is equal to the previous temperature control target value; If the current temperature control target value is equal to the previous temperature control target value, the output temperature control target value is the current temperature control target value. If the current temperature control target value is not equal to the previous temperature control target value, determine whether the current temperature control target value is greater than the previous temperature control target value; If the current temperature control target value is greater than the previous temperature control target value, the output temperature control target value is the second preset temperature target value; If the current temperature control target value is less than the previous temperature control target value, then determine whether the current temperature of the motor is greater than the first preset temperature control target value. If the current temperature of the motor is determined to be greater than the first preset temperature target value, the output temperature control target value is the second preset temperature control target value; If the current temperature of the motor is determined to be less than the first preset temperature control target value, the output temperature control target value is the first preset temperature control target value.

4. The control method according to claim 3, wherein, Determining the rotational speed of the oil-cooled electric drive oil pump based on the current output temperature control target value includes: Determine whether the current temperature of the motor is greater than the third preset temperature control target value; If the current temperature of the motor is determined to be less than the third preset temperature control target value, the oil pump speed is the oil pump speed output last time. If the current temperature of the motor is determined to be greater than the third preset temperature control target value, the oil pump speed is increased to the maximum peak speed at a speed of 50 rpm / s or 100 rpm / s, and the current temperature of the motor is stabilized within the output temperature control target value.

5. The control method according to claim 1, wherein, The preset multiple temperature reference values ​​include a first preset temperature value and a second preset temperature value, wherein the second preset temperature value is greater than the first preset temperature value.

6. The control method according to claim 5, wherein, The rate of change of the rotational speed of the oil-cooled electric pump is determined based on multiple preset temperature reference values, the current temperature, and the rotational speed of the oil-cooled electric pump, including: Determine whether the current temperature of the motor is lower than the first preset temperature value; If the current temperature of the motor is determined to be lower than the first preset temperature value, then determine whether the current oil pump speed is lower than the first preset speed. If it is determined that the current oil pump speed is less than the first preset speed, the rate of change of the oil-cooled electric drive oil pump is accelerated to the first speed value; If it is determined that the current oil pump speed is greater than the first preset speed, the rate of change of the oil-cooled electric drive oil pump is slowed down to the second speed value.

7. The control method according to claim 6, wherein, The rate of change of the rotational speed of the oil-cooled electric pump is determined based on multiple preset temperature reference values, the current temperature, and the rotational speed of the oil-cooled electric pump, including: If it is determined that the current temperature of the motor is greater than the first preset temperature value, then it is determined whether the current temperature of the motor is greater than the second preset temperature value. If the current temperature of the motor is determined to be greater than the second preset temperature value, the rate of change of the oil-cooled electric drive oil pump is accelerated to the first speed value. If the current temperature of the motor is determined to be lower than the second preset temperature value, the speed change rate of the oil-cooled electric drive oil pump remains the same as the speed change rate of the previous oil-cooled electric drive oil pump.

8. The control method according to claim 1, wherein, The step of determining the corrected speed of the oil-cooled electric drive pump based on its maximum peak speed includes: Obtain the oil pump lubrication speed of the oil-cooled electric drive oil pump; Determine whether the current oil pump speed is greater than the oil pump lubrication speed; If it is determined that the current oil pump speed is greater than the oil pump lubrication speed, the speed is corrected to the oil pump lubrication speed. If the current oil pump speed is determined to be less than the oil pump lubrication speed, determine whether the current oil pump speed is greater than the maximum peak speed of the oil pump. If the current oil pump speed is determined to be greater than the maximum peak speed of the oil pump, the speed is corrected to the maximum peak speed of the oil pump.

9. The control method according to claim 8, wherein, Determining the current speed of the oil-cooled electric drive pump based on its maximum peak speed includes: correcting the speed to the current pump speed if the current pump speed is determined to be less than the maximum peak speed.

10. A control system for an oil-cooled electrically driven oil pump, wherein, The control system includes a controller for performing the control method as described in any one of claims 1 to 9.

Images