阅读说明：本技术 电动油泵的控制方法、装置及存储介质 (Control method and device for electric oil pump and storage medium ) 是由 任宗丹 余学浩 李亚南 于 2021-08-30 设计创作，主要内容包括：本公开提供了一种电动油泵的控制方法、装置及存储介质,属于汽车技术领域。该控制方法包括：获取驱动电机的工作电流和工作温度；基于所述工作电流和所述工作温度确定所述电动油泵的工作模式,不同所述工作模式下,所述电动油泵采用不同的工作功率工作。本公开能及时润滑、冷却动力系统,且保证动力系统的冷却效果,使动力系统高效且可靠地运转。(The disclosure provides a control method and device of an electric oil pump and a storage medium, and belongs to the technical field of automobiles. The control method comprises the following steps: acquiring the working current and the working temperature of a driving motor; and determining the working mode of the electric oil pump based on the working current and the working temperature, wherein the electric oil pump works with different working powers in different working modes. The system can lubricate and cool the power system in time, ensures the cooling effect of the power system, and enables the power system to operate efficiently and reliably.)

1. A control method of an electric oil pump, characterized by comprising:

acquiring the working current and the working temperature of a driving motor;

and determining the working mode of the electric oil pump based on the working current and the working temperature, wherein the electric oil pump works with different working powers in different working modes.

2. The control method of an electric oil pump according to claim 1, wherein the determining an operation mode of the electric oil pump based on the operation current and the operation temperature includes:

determining the comprehensive temperature rate of the electric oil pump, wherein the comprehensive temperature rate is the maximum value in the ratio of each temperature parameter in the electric oil pump to the derating temperature limit value of the electric oil pump;

and if the comprehensive temperature rate is smaller than a first threshold value, determining the working mode based on the working current and the working temperature and the first corresponding relation among the current interval, the temperature interval and the working mode, wherein the larger the current interval and the temperature interval, the larger the corresponding working power of the working mode is.

3. The control method of an electric oil pump according to claim 2, characterized in that the operation modes include a first mode, a second mode, a third mode, and a fourth mode in which the operation power is sequentially increased, the current intervals include a first interval, a second interval, and a third interval that are sequentially increased and continuous, and the temperature intervals include a fourth interval, a fifth interval, a sixth interval, and a seventh interval that are sequentially increased and continuous;

the first correspondence is as follows:

when the working mode is the first mode, the working current is positioned in the first interval, and the working temperature is positioned in the fourth interval or the fifth interval; or, the working current is located in the second interval, and the working temperature is located in the fourth interval;

when the working mode is the second mode, the working current is positioned in the third interval, and the working temperature is positioned in the fourth interval; or, the working current is located in the second interval, and the working temperature is located in the fifth interval; or, the working current is located in the first interval, and the working temperature is located in the sixth interval;

when the working mode is the third mode, the working current is in the third interval, and the working temperature is in the fifth interval; or, the working current is located in the second interval, and the working temperature is located in the sixth interval; or, the working current is located in the first interval, and the working temperature is located in the seventh interval;

when the working mode is the fourth mode, the working current is in the third interval, and the working temperature is in the sixth interval or the seventh interval; or, the working current is located in the second interval, and the working temperature is located in the seventh interval.

4. The control method of an electric oil pump according to claim 3, wherein the determining an operation mode of the electric oil pump based on the operation current and the operation temperature further comprises:

and if the comprehensive temperature rate is not less than the first threshold and less than a second threshold, determining the working mode based on the working current and the working temperature and a second corresponding relation among the current interval, the temperature interval and the working mode, wherein for the same current interval and temperature interval, the working power of the working mode corresponding to the second corresponding relation is less than the working power of the working mode corresponding to the first corresponding relation.

5. The control method of the electric oil pump according to claim 4, characterized in that the second correspondence relationship is as follows:

when the working mode is the first mode, the working current is positioned in the first interval, and the working temperature is positioned in the fourth interval or the fifth interval; or, the working current is located in the second interval, and the working temperature is located in the fourth interval; or, the working current is located in the third interval, and the working temperature is located in the fourth interval; or, the working current is located in the second interval, and the working temperature is located in the fifth interval; or, the working current is located in the first interval, and the working temperature is located in the sixth interval;

when the working mode is the second mode, the working current is in the third interval, and the working temperature is in the fifth interval; or, the working current is located in the second interval, and the working temperature is located in the sixth interval; or, the working current is located in the first interval, and the working temperature is located in the seventh interval;

when the working mode is the third mode, the working current is in the third interval, and the working temperature is in the sixth interval or the seventh interval; or, the working current is located in the second interval, and the working temperature is located in the seventh interval.

6. The control method of an electric oil pump according to claim 4, wherein the determining an operation mode of the electric oil pump based on the operation current and the operation temperature further comprises:

and if the comprehensive temperature rate is not less than the second threshold value, determining the working mode as the first mode.

7. The control method of an electric oil pump according to any one of claims 1 to 6, characterized in that the operating current is equal to the sum of the square of the direct-axis current of the drive motor and the square of the quadrature-axis current of the drive motor, squared.

8. A control device of an electric oil pump, characterized by comprising:

the acquisition module is used for acquiring the working current and the working temperature of the driving motor;

and the determining module is used for determining the working mode of the electric oil pump based on the working current and the working temperature, and under different working modes, the electric oil pump works with different working powers.

9. A control device of an electric oil pump, characterized by comprising:

a processor;

a memory for storing processor-executable instructions;

wherein the processor is configured to implement the control method of the electric oil pump according to any one of claims 1 to 7 when executing the instructions.

10. A computer-readable storage medium, comprising at least one instruction which, when executed by a processor, performs a method of controlling an electric oil pump according to any one of claims 1 to 7.

Technical Field

The present disclosure relates to the field of automotive technologies, and in particular, to a method and an apparatus for controlling an electric oil pump, and a storage medium.

Background

An electric oil pump is generally arranged in a power system of a new energy automobile and a hybrid automobile to meet the cooling and lubricating requirements of the power system, so that the power system can operate efficiently and stably.

In the related art, when controlling the operation of the electric oil pump, it is general to control the operation of the electric oil pump according to the temperature of the lubricating oil and the operating temperature of the drive motor in the power system. For example, when the temperature of the lubricating oil or the working temperature of the driving motor reaches a set threshold, and the power system needs cooling and lubrication at the moment, the electric oil pump is controlled to start working; when the temperature of the lubricating oil and the working temperature of the driving motor do not reach the set threshold value, the cooling and lubricating requirements of the power system are not high, and the electric oil pump is controlled to stop working.

However, by the above-mentioned manner of controlling the electric oil pump, cooling and lubrication are prone to be out of time; and the electric oil pump is only started or stopped according to the set threshold, and the cooling and lubricating effects of the power system are poor when the temperature is low and is close to the set threshold. Therefore, the control method of the electric oil pump in the related art causes the work efficiency of the power system to be poor.

Disclosure of Invention

The embodiment of the disclosure provides a control method and device of an electric oil pump and a storage medium, which can lubricate and cool a power system in time, ensure the cooling effect of the power system and enable the power system to operate efficiently and reliably. The technical scheme is as follows:

in a first aspect, an embodiment of the present disclosure provides a control method for an electric oil pump, including: acquiring the working current and the working temperature of a driving motor; and determining the working mode of the electric oil pump based on the working current and the working temperature, wherein the electric oil pump works with different working powers in different working modes.

In one implementation of the embodiment of the present disclosure, the determining the operation mode of the electric oil pump based on the operation current and the operation temperature includes: determining the comprehensive temperature rate of the electric oil pump, wherein the comprehensive temperature rate is the maximum value in the ratio of each temperature parameter in the electric oil pump to the derating temperature limit value of the electric oil pump; and if the comprehensive temperature rate is smaller than a first threshold value, determining the working mode based on the working current and the working temperature and the first corresponding relation among the current interval, the temperature interval and the working mode, wherein the larger the current interval and the temperature interval, the larger the corresponding working power of the working mode is.

In another implementation manner of the embodiment of the present disclosure, the operating modes include a first mode, a second mode, a third mode, and a fourth mode in which the operating power is sequentially increased, the current intervals include a first interval, a second interval, and a third interval that are sequentially increased and continuous, and the temperature intervals include a fourth interval, a fifth interval, a sixth interval, and a seventh interval that are sequentially increased and continuous; the first correspondence is as follows: when the working mode is the first mode, the working current is positioned in the first interval, and the working temperature is positioned in the fourth interval or the fifth interval; or, the working current is located in the second interval, and the working temperature is located in the fourth interval; when the working mode is the second mode, the working current is positioned in the third interval, and the working temperature is positioned in the fourth interval; or, the working current is located in the second interval, and the working temperature is located in the fifth interval; or, the working current is located in the first interval, and the working temperature is located in the sixth interval; when the working mode is the third mode, the working current is in the third interval, and the working temperature is in the fifth interval; or, the working current is located in the second interval, and the working temperature is located in the sixth interval; or, the working current is located in the first interval, and the working temperature is located in the seventh interval; when the working mode is the fourth mode, the working current is in the third interval, and the working temperature is in the sixth interval or the seventh interval; or, the working current is located in the second interval, and the working temperature is located in the seventh interval.

In another implementation of the embodiment of the present disclosure, the determining the operation mode of the electric oil pump based on the operation current and the operation temperature further includes: and if the comprehensive temperature rate is not less than the first threshold and less than a second threshold, determining the working mode based on the working current and the working temperature and a second corresponding relation among the current interval, the temperature interval and the working mode, wherein for the same current interval and temperature interval, the working power of the working mode corresponding to the second corresponding relation is less than the working power of the working mode corresponding to the first corresponding relation.

In another implementation manner of the embodiment of the present disclosure, the second corresponding relationship is as follows: when the working mode is the first mode, the working current is positioned in the first interval, and the working temperature is positioned in the fourth interval or the fifth interval; or, the working current is located in the second interval, and the working temperature is located in the fourth interval; or, the working current is located in the third interval, and the working temperature is located in the fourth interval; or, the working current is located in the second interval, and the working temperature is located in the fifth interval; or, the working current is located in the first interval, and the working temperature is located in the sixth interval; when the working mode is the second mode, the working current is in the third interval, and the working temperature is in the fifth interval; or, the working current is located in the second interval, and the working temperature is located in the sixth interval; or, the working current is located in the first interval, and the working temperature is located in the seventh interval; when the working mode is the third mode, the working current is in the third interval, and the working temperature is in the sixth interval or the seventh interval; or, the working current is located in the second interval, and the working temperature is located in the seventh interval.

In another implementation of the embodiment of the present disclosure, the determining the operation mode of the electric oil pump based on the operation current and the operation temperature further includes: and if the comprehensive temperature rate is not less than the second threshold value, determining the working mode as the first mode.

In another implementation of the embodiment of the present disclosure, the operating current is equal to a sum of a square of a direct-axis current of the driving motor and a square of a quadrature-axis current of the driving motor.

In a second aspect, there is provided in an embodiment of the present disclosure a control device of an electric oil pump, the control device including: the acquisition module is used for acquiring the working current and the working temperature of the driving motor; the determining module is used for determining the working mode of the electric oil pump based on the working current and the working temperature, the working mode is different, the electric oil pump works with different working powers, and the working power of the electric oil pump is different in different working modes.

In a third aspect, an embodiment of the present disclosure provides a control device for an electric oil pump, including: a processor; a memory for storing processor-executable instructions; wherein the processor is configured to implement the control method of the electric oil pump as described hereinbefore when executing the instructions.

In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium comprising at least one instruction which, when executed by a processor, performs a method of controlling an electric oil pump as described above.

The technical scheme provided by the embodiment of the disclosure has the following beneficial effects:

according to the control method of the electric oil pump in the embodiment of the disclosure, firstly, the working circuit and the working temperature of the driving motor are obtained, and then the working mode of the electric oil pump is determined according to the working current and the working temperature. Because the working current of the driving motor is a factor directly related to the temperature rise, when the automobile is under a large-torque working condition and the working temperature of the driving motor is not high; compared with a control mode only using the working temperature as a regulation basis, the working temperature is combined to be used as a basis for controlling the working mode of the electric oil pump according to the working current of the driving current, and the lubricating and cooling can be carried out in a more timely manner before the power system generates heat.

And the working mode of the electric oil pump is determined by the working current and the working temperature, and the electric oil pump works with different working powers in different working modes. Therefore, the electric oil pump is in a working state under any working condition. Namely, the electric oil pump can use different working powers to cool and lubricate the power system at different working temperatures of the driving motor, thereby ensuring the cooling effect of the power system and enabling the power system to operate efficiently and reliably.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a flowchart of a control method of an electric oil pump according to an embodiment of the present disclosure;

FIG. 2 is a flow chart of another method of controlling an electric oil pump provided by an embodiment of the present disclosure;

fig. 3 is a schematic diagram of a control apparatus of an electric oil pump according to an embodiment of the present disclosure;

fig. 4 is a block diagram of a computer device according to an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

The related art may include in the process of controlling the electric oil pump: when the temperature of the lubricating oil and the working temperature of the driving motor reach set thresholds, the power system needs cooling and lubrication at the moment, and the electric oil pump is controlled to start working; when the temperature of the lubricating oil and the working temperature of the driving motor do not reach the set threshold value, the cooling and lubricating requirements of the power system are not high, and the electric oil pump is controlled to stop working.

However, under the working conditions of high torque demand, such as vehicle uphill, the temperature of the lubricating oil and the working temperature of the driving motor are not high, but at the moment, the heating value in the power system is large, the temperature rise is rapid, the driving motor is easy to be over-temperature, and the problem of untimely cooling and lubrication is caused; and the electric oil pump is started or stopped only according to the set threshold, and the cooling and lubricating effects of the power system are poor when the temperature is low and is close to the set threshold. Therefore, the control method of the electric oil pump in the related art causes the work efficiency of the power system to be poor.

Fig. 1 is a flowchart of a control method of an electric oil pump according to an embodiment of the present disclosure. As shown in fig. 1, the control method is executed by a vehicle controller, and includes:

step 101: the operating current and the operating temperature of the drive motor.

Step 102: an operating mode of the electric oil pump is determined based on the operating current and the operating temperature.

Wherein, under different operating mode, electric oil pump adopts different operating power work.

According to the control method of the electric oil pump in the embodiment of the disclosure, firstly, the working circuit and the working temperature of the driving motor are obtained, and then the working mode of the electric oil pump is determined according to the working current and the working temperature. Because the working current of the driving motor is a factor directly related to the temperature rise, when the automobile is under a large-torque working condition and the working temperature of the driving motor is not high; compared with a control mode only using the working temperature as a regulation basis, the working temperature is combined to be used as a basis for controlling the working mode of the electric oil pump according to the working current of the driving current, and the lubricating and cooling can be carried out in a more timely manner before the power system generates heat.

And the working mode of the electric oil pump is determined by the working current and the working temperature, and the electric oil pump works with different working powers in different working modes. Therefore, the electric oil pump is in a working state under any working condition. Namely, the electric oil pump can use different working powers to cool and lubricate the power system at different working temperatures of the driving motor, thereby ensuring the cooling effect of the power system and enabling the power system to operate efficiently and reliably.

Fig. 2 is a flowchart of another method for controlling an electric oil pump according to an embodiment of the present disclosure. As shown in fig. 2, the control method is executed by the vehicle control unit, and includes:

step 201: and acquiring the working current and the working temperature of the driving motor.

In step 201, the working current of the driving motor is equal to the square of the sum of the square of the direct axis current of the driving motor and the square of the quadrature axis current of the driving motor.

Wherein, the formula of the working current is as follows:

I_mot-ref＝(I_mot-d ²+I_mot-q ²)^1/2 (1)

in the formula (1), I_mot-refIs the working current of the driving motor and has the unit of A, I_mot-dThe unit of direct axis current for driving motor is A, I_mot-qThe quadrature axis current of the driving motor is in A.

The working current of the driving motor is a factor directly related to temperature rise, so that after the working current is determined according to the direct-axis current and the quadrature-axis current of the driving current, the working current and the working temperature are used as the basis for controlling the working mode of the electric oil pump, and the lubricating and cooling can be carried out in time before the power system generates heat.

Step 202: and determining the comprehensive temperature rate of the electric oil pump.

The comprehensive temperature rate is the maximum value of the ratio of each temperature parameter in the electric oil pump to the derating temperature limit value of the electric oil pump.

The formula for the integrated temperature rate is as follows:

T_eop-mul＝Max{(T_eop-iron+40)×100/(T_eop-dre+40)，(T_eop-mos+40)×100/(T_eop-dre+40)}

(2)

in the formula (2), T_eop-mulFor combined temperature rate, T_eop-ironIs the motor iron core temperature of the electric oil pump, and the unit is DEG C_eop-dreIs the de-rated temperature limit value of the electric oil pump, which is a fixed value and has the unit of DEG C_eop-mosThe temperature of the power chip of the electric oil pump is shown in a unit of ℃.

In the embodiment of the disclosure, the comprehensive temperature rate is the maximum value of the ratio of the temperature of the motor iron core in the electric oil pump to the derating temperature limit value of the electric oil pump and the ratio of the temperature of the power chip to the derating temperature limit value of the electric oil pump. Therefore, the current temperature condition of the electric oil pump can be more accurately reflected.

Step 203: and if the comprehensive temperature rate is smaller than the first threshold, determining the working mode based on the working current and the working temperature and the first corresponding relation among the current interval, the temperature interval and the working mode.

As an example, in the disclosed embodiments, the first threshold is 60%.

And the larger the current interval and the temperature interval are, the larger the working power of the corresponding working mode is. Therefore, the larger the working temperature and the working current are, the working mode with higher working power can be adopted for the electric oil pump to work. The electric oil pump is ensured to work under proper working power, the cooling effect of the power system is ensured, and the power system can operate efficiently and reliably.

In step 203, when the working mode is determined, the working mode may be quickly determined based on the first corresponding relationship according to the current interval where the working current is located and according to the temperature interval where the working temperature is located.

Wherein, the current interval includes first interval, second interval and third interval that increase in proper order and be continuous.

In the embodiment of the disclosure, the overload current I can be designed according to the design of the driving motor_mot-maxEach current interval of the operating current is divided for a reference. Wherein the over-current I is designed_mot-maxFor a fixed value, drive motors of different specifications have different design overload currents I_mot-max。

Illustratively, the first interval may be I_mot-max0 to 30%, the second interval may be I_mot-max31% to 50%, the third interval may be I_mot-max51% to 80%.

When the working current is in the first interval, the working current of the driving motor is smaller, and at the moment, the electric oil pump can work in a working mode with lower working power; when the working current is in the second interval, the working current of the driving motor is moderate at the moment, and the electric oil pump can work in a working mode with moderate working power; when the working current is in the third interval, the working current of the driving motor is larger at the moment, and at the moment, the electric oil pump can work in a working mode with larger working power so as to accelerate cooling and lubrication.

Optionally, the temperature intervals include a fourth interval, a fifth interval, a sixth interval, and a seventh interval that increase sequentially and continuously.

In the embodiment of the disclosure, the temperature T can be endured by the limit of the device of the driving motor_mot-maxEach temperature interval of the operating temperature is divided for the reference. Wherein the ultimate endurance temperature T of the device_mot-maxFor a fixed value, the drive motors with different specifications have different device limit tolerance temperatures T_mot-max。

Illustratively, the fourth interval may be T_mot-max0 to 20%, the fifth interval may be T_mot-max21% to 40%, the sixth interval may be T_mot-max41% to 60%, the seventh interval may be T_mot-max61% to 80%.

When the working temperature is in the fourth interval, the working temperature of the driving motor is lower at the moment, and the electric oil pump can work in a working mode with lower working power at the moment; when the working temperature is in the fifth interval and the sixth interval, the working temperature of the driving motor is moderate at the moment, and the electric oil pump can work in a working mode with moderate working power; when the working temperature is in the seventh interval, the working temperature of the driving motor is higher at the moment, and at the moment, the electric oil pump can work in a working mode with higher working power so as to accelerate cooling and lubrication.

Optionally, the operation modes include a first mode, a second mode, a third mode and a fourth mode in which the operation power is sequentially increased.

For example, the first mode may be a low load operation mode in which the electric oil pump may be operated for a long time. The operating power in the first mode is 50% to 100% of the rated power of the electric oil pump.

For example, the second mode may be a rated operation mode in which the electric oil pump can be operated for a long time. The operating power in the second mode is the rated power of the electric oil pump.

For example, the third mode may be a large load operation mode in which the electric oil pump may be operated for a short time. The operating power in the third mode is 170% to 180% of the rated power of the electric oil pump.

For example, the fourth mode may be an overload operation mode in which the electric oil pump may be operated for a short time. The operating power in the fourth mode is 190% to 200% of the rated power of the electric oil pump.

In the implementation of the present disclosure, the first corresponding relationship is as follows:

when the working mode is the first mode, the working current is positioned in a first interval, and the working temperature is positioned in a fourth interval or a fifth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the fourth interval.

When the working mode is the second mode, the working current is positioned in the third interval, and the working temperature is positioned in the fourth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the fifth interval; or the working current is positioned in the first interval, and the working temperature is positioned in the sixth interval.

When the working mode is the third mode, the working current is positioned in a third interval, and the working temperature is positioned in a fifth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the sixth interval; or the working current is positioned in the first interval, and the working temperature is positioned in the seventh interval.

When the working mode is the fourth mode, the working current is positioned in the third interval, and the working temperature is positioned in the sixth interval or the seventh interval; or the working current is positioned in the second interval, and the working temperature is positioned in the seventh interval.

Wherein the first interval may be I_mot-max0 to 30%, the second interval may be I_mot-max31% to 50%, the third interval may be I_mot-max51% to 80%, the fourth interval may be T_mot-max0 to 20%, the fifth interval may be T_mot-max21% to 40%, the sixth interval may be T_mot-max41% to 60%, the seventh interval may be T_mot-max61% to 80%.

Based on the above-described intervals, the first correspondence relationship for determining the operation mode is shown in table 1 below. Wherein the first mode, the second mode, the third mode and the fourth mode are respectively represented by A, B, C and D.

TABLE 1

The mode control is carried out on the electric oil pump by combining the working current and the working temperature of the driving motor. When the working temperature and the working current of the driving motor are lower, the electric oil pump is controlled to work in a first mode or a second mode by considering that the temperature belongs to an inertia link. When the working temperature or the working current of the driving motor is larger, the electric oil pump is controlled to work in a third mode or a fourth mode so as to keep the working temperature of the driving motor more stable and enable the power system to stably and reliably run.

Step 204: and if the comprehensive temperature rate is not less than the first threshold and less than the second threshold, determining the working mode based on the working current and the working temperature and the second corresponding relation among the current interval, the temperature interval and the working mode.

And when the current interval and the temperature interval are the same, the working power of the corresponding working mode in the second corresponding relation is smaller than the working power of the corresponding working mode in the first corresponding relation.

In the embodiment of the present disclosure, the second correspondence relationship is as follows:

when the working mode is the first mode, the working current is positioned in a first interval, and the working temperature is positioned in a fourth interval or a fifth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the fourth interval; or the working current is positioned in the third interval, and the working temperature is positioned in the fourth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the fifth interval; or the working current is positioned in the first interval, and the working temperature is positioned in the sixth interval.

When the working mode is the second mode, the working current is positioned in the third interval, and the working temperature is positioned in the fifth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the sixth interval; or the working current is positioned in the first interval, and the working temperature is positioned in the seventh interval.

When the working mode is the third mode, the working current is positioned in a third interval, and the working temperature is positioned in a sixth interval or a seventh interval; or the working current is positioned in the second interval, and the working temperature is positioned in the seventh interval.

The second mapping in step 204 is equivalent to performing power down adjustment based on the first mapping. For example, when the working mode determined by the first corresponding relationship is the second mode, the working mode determined by the second corresponding relationship is the first mode; when the working mode determined by the first corresponding relation is the third mode, the working mode determined by the second corresponding relation is the second mode; and when the working mode determined by the first corresponding relation is the fourth mode, the working mode determined by the second corresponding relation is the third mode.

In the embodiment of the disclosure, the second threshold is 80%, so that when the integrated temperature rate is between 60% and 80%, the electric oil pump is controlled to perform power reduction processing on the working power on the basis of table 1, and the electric oil pump is made to operate at a lower working power, so as to avoid that the electric oil pump is still in a high-load working state under the condition that the temperature of the electric oil pump is too high, and thus the electric oil pump is protected.

Step 205: and if the comprehensive temperature rate is not less than the second threshold value, determining the working mode as the first mode.

When comprehensive temperature rate exceeded 80%, the self temperature of electric oil pump was higher this moment, lets electric oil pump work under first mode to avoid electric oil pump to be in the operating condition of high load, with further protection electric oil pump.

In step 205, if the electric oil pump is operated in the first mode and the integrated temperature rate is still increased, it is determined that the situation is abnormal, at this time, the lubrication oil path may be blocked, and an abnormal prompt message may be output, so that a technician may overhaul the oil path. On the basis, if the electric oil pump still continuously works and the comprehensive temperature rate is increased to the upper limit, the locked-rotor protection is triggered, namely the electric oil pump is controlled to stop working until the comprehensive temperature rate is reduced to be within 80%, and the working mode of the electric oil pump is determined according to the mode.

Fig. 3 is a schematic diagram of a control device of an electric oil pump according to an embodiment of the present disclosure. As shown in fig. 3, the apparatus includes: an acquisition module 100 and a determination module 200.

The obtaining module 100 is configured to obtain an operating current and an operating temperature of the driving motor. The determining module 200 is configured to determine a working mode of the electric oil pump based on the working current and the working temperature, and the electric oil pump works with different working powers in different working modes.

In one implementation of the present disclosure, the determining module 200 includes a first determining submodule 210 and a second determining submodule 220, where the first determining submodule 210 is configured to determine a comprehensive temperature rate of the electric oil pump, and the comprehensive temperature rate is a maximum value of ratios of each temperature parameter in the electric oil pump to a derating temperature limit of the electric oil pump; the second determining submodule 220 is configured to determine the working mode based on the working current and the working temperature and the first corresponding relationship among the current interval, the temperature interval, and the working mode if the integrated temperature rate is smaller than the first threshold, where the working power of the corresponding working mode is larger when the current interval and the temperature interval are larger.

In one implementation manner of the present disclosure, the operating mode includes a first mode, a second mode, a third mode, and a fourth mode in which the operating power is sequentially increased, the current interval includes a first interval, a second interval, and a third interval that are sequentially increased and continuous, and the temperature interval includes a fourth interval, a fifth interval, a sixth interval, and a seventh interval that are sequentially increased and continuous; the first correspondence is as follows: when the working mode is the first mode, the working current is positioned in a first interval, and the working temperature is positioned in a fourth interval or a fifth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the fourth interval; when the working mode is the second mode, the working current is positioned in the third interval, and the working temperature is positioned in the fourth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the fifth interval; or the working current is positioned in the first interval, and the working temperature is positioned in the sixth interval; when the working mode is the third mode, the working current is positioned in a third interval, and the working temperature is positioned in a fifth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the sixth interval; or the working current is positioned in the first interval, and the working temperature is positioned in the seventh interval; when the working mode is the fourth mode, the working current is positioned in the third interval, and the working temperature is positioned in the sixth interval or the seventh interval; or the working current is positioned in the second interval, and the working temperature is positioned in the seventh interval.

In an implementation manner of the present disclosure, the second determining sub-module 220 is further configured to determine the operating mode based on the operating current and the operating temperature and the second corresponding relationship among the current interval, the temperature interval, and the operating mode if the integrated temperature rate is not less than the first threshold and less than the second threshold, and for the same current interval and temperature interval, the operating power of the corresponding operating mode in the second corresponding relationship is less than the operating power of the corresponding operating mode in the first corresponding relationship.

In one implementation of the present disclosure, the second correspondence is as follows: when the working mode is the first mode, the working current is positioned in a first interval, and the working temperature is positioned in a fourth interval or a fifth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the fourth interval; or the working current is positioned in the third interval, and the working temperature is positioned in the fourth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the fifth interval; or the working current is positioned in the first interval, and the working temperature is positioned in the sixth interval; when the working mode is the second mode, the working current is positioned in the third interval, and the working temperature is positioned in the fifth interval; or the working current is positioned in the second interval, and the working temperature is positioned in the sixth interval; or the working current is positioned in the first interval, and the working temperature is positioned in the seventh interval; when the working mode is the third mode, the working current is positioned in a third interval, and the working temperature is positioned in a sixth interval or a seventh interval; or the working current is positioned in the second interval, and the working temperature is positioned in the seventh interval.

In one implementation of the present disclosure, the second determination submodule 220 is further configured to determine the operation mode as the first mode if the integrated temperature rate is not less than the second threshold.

In one implementation of the present disclosure, the operating current is equal to the sum of the square of the direct axis current of the drive motor and the square of the quadrature axis current of the drive motor squared.

Fig. 4 is a block diagram of a computer device according to an embodiment of the present disclosure, and as shown in fig. 4, the computer device includes: a processor 401 and a memory 402.

Processor 401 may include one or more processing cores, such as a 4-core processor, an 8-core processor, or the like. The processor 401 may be implemented in at least one hardware form of a DSP (Digital Signal Processing), an FPGA (Field-Programmable Gate Array), and a PLA (Programmable Logic Array). The processor 401 may also include a main processor and a coprocessor, where the main processor is a processor for Processing data in an awake state, and is also called a Central Processing Unit (CPU); a coprocessor is a low power processor for processing data in a standby state. In some embodiments, the processor 401 may be integrated with a GPU (Graphics Processing Unit), which is responsible for rendering and drawing the content required to be displayed by the display screen. In some embodiments, the processor 401 may further include an AI (Artificial Intelligence) processor for processing computing operations related to machine learning.

Memory 402 may include one or more computer-readable storage media, which may be non-transitory. Memory 402 may also include high speed random access memory, as well as non-volatile memory, such as one or more magnetic disk storage devices, flash memory storage devices. In some embodiments, a non-transitory computer readable storage medium in memory 402 is used to store at least one instruction for execution by processor 401 to implement the control method of an electric oil pump provided by method embodiments herein.

In some embodiments, the computer device may further optionally include: a peripheral interface 403 and at least one peripheral. The processor 401, memory 402 and peripheral interface 403 may be connected by bus or signal lines. Each peripheral may be connected to the peripheral interface 403 via a bus, signal line, or circuit board.

Those skilled in the art will appreciate that the configuration shown in FIG. 4 is not intended to be limiting of computer devices and may include more or fewer components than those shown, or some components may be combined, or a different arrangement of components may be used.

The disclosed embodiments also provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to execute the control method of the electric oil pump according to the above embodiments. For example, the computer readable storage medium may be a ROM, a Random Access Memory (RAM), a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like.

It will be understood by those skilled in the art that all or part of the steps for implementing the above embodiments may be implemented by hardware, or may be implemented by a program instructing relevant hardware, where the program may be stored in a computer-readable storage medium, and the above-mentioned storage medium may be a read-only memory, a magnetic disk or an optical disk, etc.

The above description is only exemplary of the present disclosure and is not intended to limit the present disclosure, which is to be construed in any way as imposing limitations thereon, such as the appended claims, and all changes and equivalents that fall within the true spirit and scope of the present disclosure.