Speed reducer oil pump control method and system and vehicle

Abstract

The invention relates to a speed reducer oil pump control method and system and a vehicle. The control method comprises the steps that when a motor is in a preset working mode, whether the current wheel speed difference is larger than a preset difference value or not is determined, and if not, the oil pump rotating speed after offset is calculated and determined according to the current motor rotating speed and the rotating speed offset value of a speed reducer, and the oil pump rotating speed of the next period is calculated according to the rising slope of the current rotating speed of an oil pump of the speed reducer; comparing the deviated oil pump rotating speed with the oil pump rotating speed in the next period, judging whether the deviated oil pump rotating speed is smaller than the oil pump rotating speed in the next period or not, if yes, reducing the speed, and if not, increasing the speed; and sending a request for oil pump rotating speed. The invention further provides a control system of the reducer oil pump and a vehicle. The engine oil injection amount of the speed reduction oil pump is accurately controlled, and the problem that effective lubrication of the speed reducer is difficult to achieve under the condition that the wheel speed difference of a vehicle in a field cross-country scene is large is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of speed reducers, and in particular to a control method, system and vehicle for a speed reducer oil pump. Background Art

[0002] In today's society, with the increasing abundance of material life and people's increasing spiritual pursuits, outdoor adventures and activities close to nature have become an indispensable part of many people's lives. However, while enjoying the tranquility and harmony of nature, it is inevitable to encounter muddy, rugged, and even extremely harsh driving environments, which pose severe challenges to the performance and durability of vehicles.

[0003] Especially when encountering muddy, bumpy roads, uneven and complex road conditions that cause some wheels to be suspended, ordinary vehicles may not be able to get out of trouble due to insufficient driving force or the existence of differentials that cause the drive wheels to be unable to output torque. Four-wheel drive off-road vehicles are usually equipped with differential locks, which can lock the differentials of the drive wheels so that the drive wheels can output torque normally and help the vehicle out of trouble. However, when the differential lock is locked, the vehicle needs to output low-speed and high-torque in order to get out of trouble. At this time, the load on the reducer is very large, and the original splash lubrication alone cannot effectively protect the reducer. The reducer is a very critical component. It is prone to wear, overheating and even damage due to long-term high-load operation and frequent locking and unlocking. It affects the overall performance and service life of the vehicle.

[0004] Therefore, there is an urgent need to develop an active lubrication reducer control strategy that can accurately control the oil pump to spray lubricating oil in a wild off-road environment to meet users' love for off-road driving while ensuring that the reducer is properly protected.

[0005] The prior art generally discloses an automobile oil pump control system based on CAN and LIN communications. This control system is mainly used for controlling the oil pump driven by the brushless motor of the automobile oil pump. This low-power technology can reduce the standby power consumption of the drive control board when the oil pump is in standby condition, extend the standby life of the automobile battery, and prevent the vehicle from being unable to start due to low battery power caused by useless standby power consumption. However, the impact of outdoor off-road scenarios on high load of electric drive is not mentioned. Summary of the invention

[0006] In view of this, the purpose of the present invention is to provide a control method, system, vehicle and electronic device for a reducer oil pump to accurately control the oil injection amount of the reducer oil pump, and also to solve the problem of difficulty in achieving effective lubrication of the reducer when the vehicle has a large wheel speed difference in outdoor off-road scenarios.

[0007] In order to achieve the above object, the technical solution adopted by the present invention is as follows: A control method for a reducer oil pump comprises the following steps: S1, when the motor is in a preset working mode, determine whether the current wheel speed difference is greater than a preset difference, if not, execute S2; S2. confirm the speed offset coefficient according to the ambient temperature, determine the oil pump speed before the offset according to the current motor speed of the reducer, calculate the oil pump speed after the offset according to the offset coefficient and the oil pump speed before the offset, and calculate the oil pump speed of the next cycle according to the rising slope of the current speed of the reducer oil pump; Compare the oil pump speed after the offset with the oil pump speed of the next cycle. When the oil pump speed after the offset is less than the oil pump speed of the next cycle, determine the required oil pump speed as the current oil pump speed minus the preset oil pump speed to achieve speed reduction. When the oil pump speed after the offset is greater than or equal to the oil pump speed of the next cycle, determine the required oil pump speed as the oil pump speed after the offset to achieve speed increase. S3. Transmitting the request for the oil pump speed to the oil pump to implement oil pump injection control to protect the reducer.

[0008] According to the above technical means, by combining the motor working mode, wheel speed difference, motor speed of the reducer and ambient temperature, the required oil pump speed is determined through comprehensive calculation; and the request for the required oil pump speed is transmitted to the oil pump, so as to accurately control the oil injection amount, ensure the effective lubrication of the reducer, improve the adaptability of the lubrication system, achieve effective protection of the reducer, and improve the safety and reliability of vehicle operation, especially when the vehicle is in an off-road scene with a large wheel speed difference, the oil injection amount can be controlled in a timely and accurate manner. The problem of difficulty in achieving effective lubrication of the reducer in an off-road scene with a large wheel speed difference is solved.

[0009] Preferably, in S3, the request for the required oil pump speed is transmitted to the oil pump through a communication module, and the communication module includes: A LIN internal communication module realizes information interaction between the ECU of the motor controller and the LIN internal communication module through SPI communication; The vehicle wiring harness realizes information interaction between the LIN internal communication module and the reducer controller EOP through the vehicle wiring harness, so as to establish external communication with the oil pump through the LIN internal communication module and transmit the request for the oil pump speed to the oil pump.

[0010] By setting up LIN communication, real-time monitoring of the reducer can be achieved, and the oil pump speed can be adjusted timely and accurately, improving the safety and reliability of vehicle operation.

[0011] Preferably, the rotation speed offset coefficient is obtained by looking up a comparison table of ambient temperature and rotation speed offset coefficient.

[0012] Preferably, the oil pump speed before the offset is obtained by looking up a comparison table between the current motor speed of the reducer and the oil pump speed before the offset.

[0013] Preferably, in S1, the control method further includes: Determine whether the reducer has a reducer oil pump fault, where the reducer oil pump fault includes an oil pump fault itself and / or a LIN communication fault.

[0014] During the entire process of executing the control method, it is determined in real time whether the reducer has a reducer oil pump failure, so as to timely discover and deal with the problem, avoid equipment damage and production interruption, reduce the risk of sudden failures, help extend the service life of the reducer, improve equipment operation efficiency, and reduce maintenance costs. By distinguishing between the oil pump's own failure and the LIN communication failure, the problem can be located more accurately and the maintenance efficiency can be improved.

[0015] Preferably, in S1, the preset working mode includes any one of a standby mode, a Ud control mode, a torque control mode, a sleep preparation mode and a discharge mode; If it is determined that the reducer is faulty or the motor is not in the preset working mode, the required oil pump speed is determined to be 0.

[0016] When a reducer failure is detected or the motor working mode is not in the preset working mode, the system can automatically determine and determine that the required oil pump speed is 0. This effectively prevents the equipment from running under unsuitable conditions and avoids possible damage and maintenance costs. By stopping the oil pump operation in time, the safety and reliability of the system are ensured, while reducing the production interruption time caused by failures.

[0017] Among them, when the motor working mode is any one of the initialization mode, the pre-charging mode and the fault mode, it means that the motor working mode is not in the preset working mode.

[0018] Preferably, in S1, if the current wheel speed difference is greater than a preset difference, the required oil pump speed is determined to be the maximum oil pump speed.

[0019] When it is detected that the wheel speed difference is greater than the preset difference, the system can quickly adjust the oil pump speed to the highest, ensuring sufficient hydraulic power in an emergency, thereby quickly responding to the dynamic needs of the vehicle. By increasing the oil pump speed in a timely manner, the risk of wheel slippage or loss of control can be effectively reduced, the driving stability of the vehicle under complex road conditions can be enhanced, and driving safety can be improved. This design reflects a deep understanding of the dynamic performance of the vehicle, and optimizes the vehicle's handling performance and fuel efficiency through an intelligent oil pump control strategy. By setting a preset difference, the system can actively intervene before a problem occurs, reduce the wear caused by the oil pump working in an inefficient state for a long time, and extend the service life of the oil pump. When the driver encounters an emergency, he can feel the vehicle's more sensitive and reliable handling response, thereby improving the driving experience.

[0020] Preferably, in S1, the wheel speed difference represents the difference between the rotation speeds of the left rear wheel and the right rear wheel of the vehicle.

[0021] Preferably, in S2, the rising slope is the rising value of the speed of the reducer oil pump per second.

[0022] Among them, the motor working mode is controlled by the VCU request working mode.

[0023] The current motor speed is calculated based on the sin excitation value and cos excitation value of the resolver feedback. After the feedback excitation value (black line) is collected by the hardware, the outer envelope of the feedback excitation value is obtained based on the plotted point calculation, and the true value of sin_value / cos_value (red line) is obtained.

[0024] The sin excitation value and cos excitation value of the resolver feedback usually refer to the sine (sin) and cosine (cos) function values ​​used to describe the rotation angle in the resolver sensor. These values ​​reflect the phase θ change of the resolver sensor output signal and are important parameters for evaluating the rotation angle and speed. The angle calculation uses the following formula: sin_value = Asin(θ) cos_value = Acos(θ) θ = arctan(sin_value / cos_value) Where θ represents the rotation angle. By measuring the sin excitation value and cos excitation value, sin_value represents the outer envelope of the measured sin excitation value, and cos_value represents the outer envelope of the measured cos excitation value, the rotation angle of the resolver sensor can be determined, thereby achieving precise position and speed control.

[0025] Current motor speed = (△θ / 360) / △t Among them, △θ represents the change of one cycle angle; △t represents the time of one cycle, and in this application, one cycle time is set to 102.4us. For example, if the change of one cycle angle is 1°, the current motor speed = 1 / 360 / (102.4 / 1000 / 1000 / 60) = 1627.6rpm.

[0026] The present invention also provides a control system for a reducer oil pump, comprising a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of the control method for the reducer oil pump as described in the present invention when executing the computer program.

[0027] The present invention also provides a vehicle, comprising the control system of the reducer oil pump of the present invention.

[0028] Beneficial effects of the present invention: The control method of the reducer oil pump of the present invention checks the working mode of the motor, which helps to find and deal with problems in time to avoid further damage; by determining whether the current wheel speed difference is greater than the preset difference, the oil pump speed can be dynamically adjusted according to the actual operation situation, thereby improving the adaptability and flexibility of the system; by considering the influence of the ambient temperature on the oil pump speed, by confirming the speed offset coefficient and calculating the oil pump speed after the offset, the method can adapt to different working environments and ensure the stable operation of the reducer; by calculating the oil pump speed of the next cycle according to the rising slope of the current oil pump speed, the method has a certain predictability, can make adjustments in advance, and optimize the working efficiency of the reducer; by comparing the oil pump speed after the offset with the oil pump speed of the next cycle, and determining the required oil pump speed accordingly, the method can effectively control the oil pump speed to protect the reducer from damage; by transmitting the request for the required oil pump speed to the oil pump, thereby accurately controlling the oil injection amount, the method can respond to system requirements in real time, thereby ensuring the effective lubrication of the reducer, improving the adaptability of the lubrication system, ensuring the normal operation of the reducer, and improving the safety and reliability of vehicle operation, especially when the vehicle is in a wild off-road scene with a large wheel speed difference, the oil injection amount can be controlled in time and accurately. The invention solves the problem that it is difficult to effectively lubricate the reducer when there is a large difference in wheel speed in off-road scenarios, and has promotion and application value in the field of reducer technology. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a flow chart of the control method of the reducer oil pump of the present invention; Figure 2 It is a schematic diagram of the control method of the reducer oil pump of the present invention. DETAILED DESCRIPTION

[0030] The following will describe the embodiments of the present invention with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention. It should be understood that the preferred embodiments are only for illustrating the present invention, not for limiting the scope of protection of the present invention.

[0031] It should be noted that the illustrations provided in the following embodiments are only schematic illustrations of the basic concept of the present invention, and thus the drawings only show components related to the present invention rather than being drawn according to the number, shape and size of components in actual implementation. In actual implementation, the type, quantity and proportion of each component may be changed arbitrarily, and the component layout may also be more complicated.

[0032] In the following description, numerous details are discussed to provide a more thorough explanation of the embodiments of the present application. However, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details.

[0033] The present invention is intended to provide a control method, system and vehicle for a reducer oil pump, so as to accurately control the oil injection amount of the reducer oil pump, and also solve the problem that it is difficult to effectively lubricate the reducer when the vehicle is in an off-road scene with a large wheel speed difference.

[0034] Among them, Figure 1 As shown, a control method for a reducer oil pump comprises the following steps: S1, when the motor is in a preset working mode, determine whether the current wheel speed difference is greater than a preset difference, if not, execute S2; S2. According to the ambient temperature, the speed offset coefficient is confirmed, and according to the current motor speed of the reducer, the oil pump speed before the offset is determined. According to the offset coefficient and the oil pump speed before the offset, the oil pump speed after the offset is calculated; at the same time, according to the rising slope of the current speed of the reducer oil pump, the oil pump speed of the next cycle is calculated; Compare the oil pump speed after the offset with the oil pump speed of the next cycle. When the oil pump speed after the offset is less than the oil pump speed of the next cycle, determine the required oil pump speed as the current oil pump speed minus the preset oil pump speed to achieve speed reduction. When the oil pump speed after the offset is greater than or equal to the oil pump speed of the next cycle, determine the required oil pump speed as the oil pump speed after the offset to achieve speed increase. S3: transmit the request for the oil pump speed to the oil pump to implement the oil pump injection control to protect the reducer.

[0035] The required oil pump speed is determined by combining the motor working mode, wheel speed difference, motor speed of the reducer and ambient temperature, and the request for the required oil pump speed is transmitted to the oil pump, thereby accurately controlling the oil injection amount, ensuring the effective lubrication of the reducer, improving the adaptability of the lubrication system, achieving effective protection of the reducer, and improving the safety and reliability of vehicle operation, especially when the vehicle is in an off-road scene with a large wheel speed difference, the oil injection amount can be controlled in a timely and accurate manner. This solves the problem of difficulty in achieving effective lubrication of the reducer when the vehicle is in an off-road scene with a large wheel speed difference.

[0036] Exemplarily, the preset oil pump speed is 10 rpm.

[0037] Among them, in S2, the oil pump speed rising slope is a fixed value of 1000rpm / s, and one cycle time is 10ms, that is, the speed rises by 10rpm in one cycle, and the oil pump speed in the next cycle = current speed + 10rpm.

[0038] In some embodiments, in S3, the request for the oil pump speed is transmitted to the oil pump through a communication module, and the communication module includes: LIN internal communication module, which realizes information exchange between the motor controller's ECU and the LIN internal communication module through SPI communication; The vehicle wiring harness realizes the information interaction between the LIN internal communication module and the reducer controller EOP through the vehicle wiring harness, so as to establish external communication with the oil pump through the LIN internal communication module and transmit the request for the oil pump speed to the oil pump.

[0039] In some embodiments, the communication module also includes: a vehicle twisted pair cable, which establishes CAN communication with other external controllers through the vehicle twisted pair cable.

[0040] Among them, Figure 2 As shown in the figure, the principle of the control method of the reducer oil pump is as follows: the motor controller is awakened by an external hard line to keep in working state. When there is no hard line awakening, the motor controller keeps in low power consumption state to avoid battery feeding; after the motor controller wakes up, CAN communication is established with other external controllers through the vehicle twisted pair cable; SPI communication is established with the LIN chip through the LIN module built into the MCU of the motor controller; and communication is established with the oil pump controller EOP through the vehicle wiring harness connection; thereby achieving the connection between the motor controller and the oil pump controller, thereby controlling the operation of the oil pump.

[0041] In some embodiments, the rotation speed offset coefficient frac1 is obtained by looking up a comparison table of ambient temperature and rotation speed offset coefficient. The comparison table of ambient temperature T and rotation speed offset coefficient frac1 is obtained by experimental calibration.

[0042] Among them, the comparison table of ambient temperature T and speed deviation coefficient frac1 is: T_block

[11] [1]={(-35.0,1.10),(-30.0,1.09),(-25.0,1.08),(-20.0,1.07),(-15.0, 1.06),(-10.0,1.05),(-5.0,1.04),(0.0,1.03),(5.0,1.02),(15.0,1.01),(25.0,1.0)} .

[0043] Among them, in the comparison table, the brackets () on the right side of the equation, such as (-35.0,1.10) correspond to (ambient temperature, speed offset coefficient). Two adjacent brackets, such as (-35.0,1.10), (-30.0,1.09) correspond to the ambient temperature between -35℃ and -30℃, and the speed offset coefficient is 1.10 or 1.09. In actual application, the collected ambient temperature is compared with the ambient temperature in the comparison table. If the ambient temperature is between the two temperatures, the larger value of the speed offset coefficient frac1 is taken as the speed offset coefficient frac1. The maximum value of the speed offset coefficient frac1 is 1.1, and the minimum value of the speed offset coefficient frac1 is 1.0.

[0044] In some embodiments, the oil pump speed spd2 before the offset is obtained by looking up the comparison table between the current motor speed of the reducer and the oil pump speed spd2 before the offset. The oil pump speed spd2 before the offset is obtained by looking up the comparison table between the current motor speed of the reducer and the oil pump speed spd2 before the offset through experimental calibration.

[0045] Among them, the comparison table of the current motor speed of the reducer and the oil pump speed spd2 before offset is: Spd_block

[18] [1]={(1.0,0.0),(50.0,0.0),(100.0,500.0),(201.0,1000.0 ),(501.0,1400.0),(1001.0,1800.0),(1501.0,2200.0),(2001.0,2500.0),( 2495.0,2800.0),(2496.0,0.0),(3501.0,0.0),(4001.0,0.0),(4501.0,0.0) ,(5001.0,0.0),(5501.0,0.0),(6001.0,0.0),(6501.0,0.0),(7001.0,0.0)}. In the comparison table, the brackets () on the right side of the equation, such as (1.0, 0.0) correspond to (current motor speed, oil pump speed before offset). Two adjacent brackets, such as (1.0, 0.0), (50.0, 0.0) correspond to the ambient temperature between 1.0 and 50.0, and the speed offset coefficient is 0.0. Through the comparison table of the current motor speed of the reducer and the oil pump speed spd2 before offset, the oil pump speed spd2 before offset is obtained according to the current motor speed of the reducer. After the motor speed exceeds 2496rpm, the oil pump speed request will become 0, and it is considered that the vehicle is running at high speed at this time and no oil pump lubrication is required.

[0046] In some embodiments, the oil pump speed after the offset is the product of the offset coefficient and the oil pump speed before the offset. That is, the calculation formula is: SpdReq=spd2*frac1, where SpdReq represents the oil pump speed after the offset, spd2 represents the oil pump speed before the offset, and frac1 represents the offset coefficient. If the calculated oil pump speed SpdReq after the offset is greater than 2800, the oil pump speed SpdReq after the offset is limited to 2800.

[0047] In some embodiments, the control method further comprises: Determine in real time whether there is a reducer oil pump failure in the reducer, so as to discover and deal with the problem in time, avoid equipment damage and production interruption, and reduce the risks caused by sudden failures. Reducer oil pump failure includes oil pump failure itself and / or LIN communication failure, so as to locate the problem more accurately and improve maintenance efficiency.

[0048] In some embodiments, in S1, the preset working mode includes any one of a standby mode, a Ud control mode, a torque control mode, a ready-to-sleep mode, and a discharge mode.

[0049] In some embodiments, in order to prevent the equipment from operating under unsuitable conditions, thereby avoiding possible damage and maintenance costs, in S1, if it is determined that the reducer is faulty or the motor working mode is not in the preset working mode, the required oil pump speed is determined to be 0. Stopping the oil pump operation in time can ensure the safety and reliability of the system, while reducing the production interruption time caused by the fault.

[0050] Among them, when the motor working mode is any one of the initialization mode, the pre-charging mode and the fault mode, it means that the motor working mode is not in the preset working mode.

[0051] In some embodiments, in order to ensure that sufficient hydraulic power is provided in an emergency situation, thereby quickly responding to the dynamic needs of the vehicle, in S1, if the current wheel speed difference is greater than a preset difference, the required oil pump speed is determined to be the maximum oil pump speed.

[0052] In some embodiments, in S1 , the wheel speed difference represents the difference between the rotation speeds of the left rear wheel and the right rear wheel of the vehicle.

[0053] Exemplarily, the preset difference in wheel speed is 20 km / h.

[0054] In some embodiments, in S2 , the rising slope is the rising value of the speed of the reducer oil pump per second.

[0055] Among them, the motor working mode is controlled by the VCU request working mode.

[0056] The current motor speed is calculated based on the sin excitation value and cos excitation value of the resolver feedback. After the feedback excitation value (black line) is collected by the hardware, the outer envelope of the feedback excitation value is obtained based on the plotted point calculation, and the true value of sin_value / cos_value (red line) is obtained.

[0057] The sin excitation value and cos excitation value of the resolver feedback usually refer to the sine (sin) and cosine (cos) function values ​​used to describe the rotation angle in the resolver sensor. These values ​​reflect the phase θ change of the resolver sensor output signal and are important parameters for evaluating the rotation angle and speed. The angle calculation uses the following formula: sin_value = Asin(θ) cos_value = Acos(θ) θ = arctan(sin_value / cos_value) Where θ represents the rotation angle. By measuring the sin excitation value and cos excitation value, sin_value represents the outer envelope of the measured sin excitation value, and cos_value represents the outer envelope of the measured cos excitation value, the rotation angle of the resolver sensor can be determined, thereby achieving precise position and speed control.

[0058] Current motor speed = (△θ / 360) / △t Among them, △θ represents the change of one cycle angle; △t represents the time of one cycle, and in this application, one cycle time is set to 102.4us. For example, if the change of one cycle angle is 1°, the current motor speed = 1 / 360 / (102.4 / 1000 / 1000 / 60) = 1627.6rpm.

[0059] The oil pump is mechanically connected to the reducer, and absorbs the oil at the bottom of the reducer into the oil pump. The oil is then pressurized by the oil pump and sprayed into the differential lock (mounted on the reducer) through the oil pipe to protect the reducer. The oil pump itself is driven by electricity and does not share the power source with the reducer, thus achieving precise control of the injection amount.

[0060] In some embodiments, a control system for a reducer oil pump is also provided, including a memory and a processor, wherein the memory stores a computer program, and when the processor executes the computer program, the steps of the control method for the reducer oil pump in any of the above embodiments are implemented.

[0061] In some embodiments, a vehicle is further provided, the vehicle comprising the control system of the retarder oil pump in any of the above embodiments.

[0062] In summary, the control method of the reducer oil pump of the present invention first checks whether the motor working mode is in the preset working mode, so as to timely discover and solve the problem and prevent further damage. Then, by judging whether the current wheel speed difference exceeds the preset threshold, the oil pump speed is dynamically adjusted according to the actual operating conditions, thereby enhancing the adaptability and flexibility of the system. In addition, the method also takes into account the influence of ambient temperature on the oil pump speed, and calculates the adjusted oil pump speed by confirming the speed offset coefficient, ensuring the stable operation of the reducer under different working environments. By calculating the rising slope of the current oil pump speed and predicting the oil pump speed of the next cycle, the method is forward-looking and can be adjusted in advance to optimize the working efficiency of the reducer. By comparing the adjusted oil pump speed with the predicted speed of the next cycle, the required oil pump speed is determined, the oil pump speed is effectively controlled, and the reducer is protected from damage. Finally, the instruction of the required oil pump speed is transmitted to the oil pump, the oil injection amount is accurately controlled, and the real-time response to the system requirements is ensured to ensure the effective lubrication of the reducer. This method improves the adaptability of the lubrication system, ensures the normal operation of the reducer, and enhances the safety and reliability of vehicle operation. Especially when the vehicle is performing off-road driving in the wild, facing a large wheel speed difference, this method can timely and accurately control the oil injection amount, effectively solving the technical problem of difficult to achieve effective lubrication of the reducer in off-road scenarios, and has the potential for promotion and application in the field of reducer technology.

[0063] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present application. Anyone familiar with the technology may modify or change the above embodiments without violating the spirit and scope of the present application. Therefore, all equivalent modifications or changes made by a person of ordinary skill in the art without departing from the spirit and technical ideas disclosed in the present application shall still be covered by the claims of the present application.

Claims

1. A control method for a reducer oil pump, characterized in that: The following steps are involved: S1, when the motor is in a preset working mode, determine whether the current wheel speed difference is greater than a preset difference, if not, execute S2; S2. confirming the speed offset coefficient according to the ambient temperature, determining the oil pump speed before the offset according to the current motor speed of the reducer, calculating the oil pump speed after the offset according to the speed offset coefficient and the oil pump speed before the offset, and calculating the oil pump speed of the next cycle according to the rising slope of the current speed of the reducer oil pump; Compare the oil pump speed after the offset with the oil pump speed of the next cycle. When the oil pump speed after the offset is less than the oil pump speed of the next cycle, determine the required oil pump speed to be the current oil pump speed minus the preset oil pump speed. When the oil pump speed after the offset is greater than or equal to the oil pump speed of the next cycle, determine the required oil pump speed to be the oil pump speed after the offset. S3. Transmitting the request for the oil pump speed to the oil pump to implement oil pump injection control to protect the reducer.

2. The control method of the reducer oil pump according to claim 1, characterized in that: In S3, the request for the required oil pump speed is transmitted to the oil pump through a communication module, and the communication module includes: A LIN internal communication module realizes information interaction between the ECU of the motor controller and the LIN internal communication module through SPI communication; The vehicle wiring harness realizes information interaction between the LIN internal communication module and the reducer controller EOP through the vehicle wiring harness, so as to establish external communication with the oil pump through the LIN internal communication module and transmit the request for the oil pump speed to the oil pump.

3. The control method of the reducer oil pump according to claim 1, characterized in that: The speed offset coefficient is obtained by looking up the ambient temperature and speed offset coefficient comparison table; And / or, the oil pump speed before the offset is obtained by looking up a comparison table between the current motor speed of the reducer and the oil pump speed before the offset.

4. The control method of the reducer oil pump according to claim 1, characterized in that: The oil pump speed after the offset is the product of the offset coefficient and the oil pump speed before the offset.

5. The control method of the reducer oil pump according to claim 1, characterized in that: The control method further comprises: Determine whether the reducer has a reducer oil pump fault, where the reducer oil pump fault includes an oil pump fault itself and / or a LIN communication fault.

6. The control method of the reducer oil pump according to claim 5, characterized in that: In S1, the preset working mode includes any one of a standby mode, a Ud control mode, a torque control mode, a sleep preparation mode and a discharge mode; If it is determined that the reducer is faulty or the motor working mode is not in the preset working mode, the required oil pump speed is determined to be 0.

7. The control method of the reducer oil pump according to claim 1, characterized in that: In S1, if the current wheel speed difference is greater than a preset difference, the required oil pump speed is determined to be the maximum oil pump speed.

8. The control method of the reducer oil pump according to claim 1, characterized in that: In S1, the wheel speed difference represents the difference between the rotation speeds of the left rear wheel and the right rear wheel of the vehicle; And / or, in S2, the rising slope is the rising value of the speed of the reducer oil pump per second.

9. A control system for a reducer oil pump, comprising a memory and a processor, wherein the memory stores a computer program, characterized in that: When the processor executes the computer program, the steps of the method for controlling the reducer oil pump according to any one of claims 1 to 8 are implemented.

10. A vehicle, characterized in that: The vehicle includes the control system for the retarder oil pump according to claim 9.

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