CN-121993571-A - Method, system, vehicle, medium and product for lubricating differential

Abstract

The present disclosure relates to a method, system, vehicle, medium, and product for lubrication of a differential. The lubrication method of the differential comprises the steps of obtaining the current vehicle running speed when the differential and the half shaft are in a disengaging state through a disengaging device, controlling the electric drive motor to operate under a preset electric drive motor working condition according to the obtained current vehicle running speed, controlling the oil pump motor to operate under a preset oil pump motor working condition, wherein the operation under the preset electric drive motor working condition comprises the steps of stopping the differential after the preset electric drive motor rotates at a preset speed and each time of operation for a preset electric drive motor operation duration, and restarting the differential after the intermittent preset electric drive motor stops for a long time, and the operation under the preset oil pump motor working condition comprises the steps of stopping the differential after the preset oil pump motor rotates at a preset oil pump motor rotating speed and each time of operation for a preset oil pump motor operation duration and restarting the differential after the intermittent preset oil pump motor stops for a long time. Under the condition that the disconnecting device enables the differential mechanism and the half shaft to be in a disconnecting state, an intermittent lubrication strategy is adopted according to the real-time running speed of the vehicle, so that the power consumption is reduced, and the whole vehicle cruising is ensured.

Inventors

• Wang wanbao
• WANG XIAOKAI

Assignees

• 小米汽车科技有限公司

Dates

Publication Date

20260508

Application Date

20260228

Claims (11)

1. 1. A method of lubricating a differential comprising: acquiring the current vehicle running speed when the differential and the half shaft are in a disengaging state by the disengaging device; according to the obtained current vehicle running speed, controlling the electric drive motor to run under a preset electric drive motor working condition, and controlling the oil pump motor to run under a preset oil pump motor working condition, wherein: The operation under the working condition of the preset electric drive motor comprises the steps of stopping the motor after the rotation speed of the electric drive motor is preset and the operation duration of the electric drive motor is preset each time, and stopping the motor again after the stopping duration of the electric drive motor is intermittently preset; the operation under the working condition of the preset oil pump motor comprises the steps of stopping the motor after the operation time of the preset oil pump motor is set at the preset oil pump motor rotating speed each time, and stopping the motor after the operation time of the intermittent preset oil pump motor is set.
2. 2. The method of claim 1, wherein a plurality of consecutive travel speed intervals are provided, wherein each travel speed interval corresponds to a set of preset electric drive motor conditions and/or each travel speed interval corresponds to a set of preset oil pump motor conditions; the lubrication method of the differential comprises the following steps: Acquiring a running speed interval corresponding to the current running speed of the vehicle; And controlling the electric drive motor to run under the preset electric drive motor working condition corresponding to the running speed interval according to the obtained running speed interval, and controlling the oil pump motor to run under the preset oil pump motor working condition corresponding to the running speed interval.
3. 3. The method according to claim 2, wherein the preset electric motor rotation speed, the preset electric motor operation duration, the preset oil pump motor rotation speed, and the preset oil pump motor operation duration corresponding to the traveling speed section of a high speed section are respectively greater than those of a low speed section, and the preset electric motor stop duration and the preset oil pump motor stop duration corresponding to the traveling speed section of a high speed section are respectively less than those of a low speed section, among a plurality of continuous traveling speed sections.
4. 4. A method of lubricating a differential according to claim 3, wherein the length of the travel speed section of a low speed section is greater than the length of the travel speed section of a high speed section in a plurality of consecutive travel speed sections.
5. 5. The lubrication method of the differential according to claim 2, characterized in that the lubrication method of the differential includes: When the acquired running speed of the vehicle deviates from the current running speed interval, and the duration of the deviation is greater than or equal to the preset deviation duration, controlling the electric drive motor to run under the preset electric drive motor working condition corresponding to the new running speed interval, and controlling the oil pump motor to run under the preset oil pump motor working condition corresponding to the new running speed interval.
6. 6. The lubrication method of a differential according to claim 1, wherein, in one lubrication cycle, a sum of the preset electric motor operation time period and the preset electric motor stop time period is equal to a sum of the preset oil pump motor operation time period and the preset oil pump motor stop time period, and the preset electric motor operation time period is equal to or less than the preset oil pump motor operation time period.
7. 7. The method of lubricating a differential according to claim 1, characterized in that the method of lubricating a differential further comprises: Acquiring the running state of a vehicle, wherein the running state of the vehicle comprises stopping and starting; When the vehicle is in a starting working condition and has no lubrication action in a preset non-lubrication time period, the electric drive motor is controlled to run at the self-lubrication rotating speed of the electric drive motor, the oil pump motor is controlled to run at the self-lubrication rotating speed of the oil pump motor, and the electric drive motor and the oil pump motor run for the same time.
8. 8. A lubrication system for a differential, characterized by a lubrication method for implementing a differential according to any one of claims 1-7, the lubrication system of the differential comprising: A differential; A disengagement means for disengaging or engaging the differential with a half shaft, the half shaft being connected to the wheels; an electric drive motor for driving the differential case of the differential to rotate, and And the oil pump is used for spraying lubricating oil into the differential mechanism.
9. 9. A vehicle comprising the lubrication system of the differential of claim 8.
10. 10. A non-transitory computer readable storage medium storing computer program instructions, wherein the computer program instructions when executed by a processor implement the method of lubricating a differential of any one of claims 1-7.
11. 11. A computer program product comprising computer program instructions, characterized in that the computer program instructions, when executed by a processor, implement a method of lubricating a differential as claimed in any one of claims 1-7.

Description

Method, system, vehicle, medium and product for lubricating differential Technical Field The disclosure relates to the technical field of new energy vehicles, in particular to a lubrication method, a lubrication system, a lubrication vehicle, a lubrication medium and a lubrication product of a differential mechanism. Background In some related art, the electric drive assembly is integrated with a disconnect for controlling the electric drive and the overall wheel end power delivery. For example, under the working condition of low power, the electric drive system is disconnected with the transmission system, so that energy loss is reduced, and under the working condition of high power required by acceleration, climbing and the like, the electric drive system is connected with the transmission system, so that the power requirement is met. The differential mechanism is integrated in the electric drive assembly, the disengaging gear is positioned between the differential gear and the whole vehicle transmission half shaft, and under the disengaging working condition, because the left half shaft and the right half shaft have speed difference, if the internal parts of the differential mechanism are not sufficiently lubricated, the abrasion is aggravated, and then the parts are invalid. The lubrication strategy in the related art has larger energy consumption, and is not beneficial to guaranteeing the whole vehicle endurance. Disclosure of Invention To overcome the problems in the related art, the present disclosure provides a method, system, vehicle, medium, and product for lubrication of a differential. According to a first aspect of embodiments of the present disclosure, there is provided a lubrication method of a differential, including: acquiring the current vehicle running speed when the differential and the half shaft are in a disengaging state by the disengaging device; according to the obtained current vehicle running speed, controlling the electric drive motor to run under a preset electric drive motor working condition, and controlling the oil pump motor to run under a preset oil pump motor working condition, wherein: The operation under the working condition of the preset electric drive motor comprises the steps of stopping the motor after the rotation speed of the electric drive motor is preset and the operation duration of the electric drive motor is preset each time, and stopping the motor again after the stopping duration of the electric drive motor is intermittently preset; the operation under the working condition of the preset oil pump motor comprises the steps of stopping the motor after the operation time of the preset oil pump motor is set at the preset oil pump motor rotating speed each time, and stopping the motor after the operation time of the intermittent preset oil pump motor is set. The technical scheme provided by the embodiment of the disclosure can comprise the following beneficial effects that the lubrication method of the differential provided by the disclosure adopts an intermittent lubrication strategy according to the real-time running speed of the vehicle when the differential and the half shaft are in a disengaging state by the disengaging device. The intermittent lubrication control strategy is characterized in that the electric drive motor is controlled to stop after the preset electric drive motor running time is preset each time, the oil pump motor is controlled to stop after the preset oil pump motor running time is preset each time, the intermittent lubrication strategy based on the actual lubrication requirement is designed to be started and stopped again after the intermittent oil pump motor running time is preset each time, energy consumption waste caused by continuous running of the electric drive motor and the oil pump motor is avoided, lubrication shortage caused by the fact that the electric drive motor is stopped for a long time is avoided, and accordingly continuous lubrication is realized. In some possible embodiments, a plurality of continuous running speed intervals are configured, wherein each running speed interval corresponds to a set of preset electric drive motor working conditions, and/or each running speed interval corresponds to a set of preset oil pump motor working conditions; the lubrication method of the differential comprises the following steps: Acquiring a running speed interval corresponding to the current running speed of the vehicle; And controlling the electric drive motor to run under the preset electric drive motor working condition corresponding to the running speed interval according to the obtained running speed interval, and controlling the oil pump motor to run under the preset oil pump motor working condition corresponding to the running speed interval. The running conditions of the electric drive motor and the oil pump are adjusted when the running speed of the vehicle changes across the interval according to different preset elect