Differential lubrication method and system, vehicle, medium and product

Abstract

The invention relates to a lubricating method and system of a differential mechanism, a vehicle, a medium and a product. The lubricating method of the differential mechanism comprises the steps that when the differential mechanism and a half shaft are in a disengaged state through a disengagement device, the current vehicle running speed is obtained; according to the obtained current vehicle running speed, an electric drive motor is controlled to run under the preset electric drive motor working condition, and an oil pump motor is controlled to run under the preset oil pump motor working condition; wherein the operation according to the preset electric drive motor working condition comprises the following steps: at a preset electric drive motor rotating speed, stopping after the preset electric drive motor operation duration is operated every time, and operating again after the preset electric drive motor stopping duration is intermittent; the operation according to the preset oil pump motor working condition comprises the steps of stopping after the preset oil pump motor operation duration is operated at the preset oil pump motor rotating speed, and operating again after the preset oil pump motor stopping duration is intermittent. When the disengagement device enables the differential mechanism and the half shaft to be in a disengagement state, an intermittent lubrication strategy is adopted according to the real-time running speed of the vehicle, power consumption can be reduced, and the endurance of the whole vehicle is guaranteed.

Description

Technical Field

[0001] This disclosure relates to the field of new energy vehicle technology, and in particular to a lubrication method, system, vehicle, medium and product for a differential. Background Technology

[0002] In some related technologies, the electric drive assembly integrates a disconnection device to control the power transmission between the electric drive and the wheels. For example, under low-power conditions, the electric drive system is disconnected from the transmission system to reduce energy loss; under high-power conditions such as acceleration and climbing, the electric drive system is engaged with the transmission system to meet power requirements.

[0003] The electric drive assembly integrates a differential, with the disengagement device located between the differential gear and the vehicle's drive half-shaft. Under disengagement conditions, due to the speed difference between the left and right half-shafts, insufficient lubrication of the internal differential components can lead to accelerated wear and eventual component failure. The lubrication strategies employed in related technologies are energy-intensive, which is detrimental to ensuring the vehicle's range. Summary of the Invention

[0004] To overcome the problems existing in the related technologies, this disclosure provides a lubrication method, system, vehicle, medium and product for a differential.

[0005] According to a first aspect of the present disclosure, a method for lubricating a differential is provided, comprising:

[0006] With the differential and half-shaft disengaged by the disengagement device, the current vehicle speed is obtained. Based on the obtained current vehicle speed, the electric drive motor is controlled to operate under preset electric drive motor conditions, and the oil pump motor is controlled to operate under preset oil pump motor conditions; wherein: Operating under preset electric drive motor conditions includes: operating at a preset electric drive motor speed, stopping after each preset electric drive motor running time, and restarting after intermittent preset electric drive motor stop times; Operating under preset oil pump motor conditions includes: operating at a preset oil pump motor speed, stopping after a preset oil pump motor running time each time, and restarting after an intermittent preset oil pump motor stop time.

[0007] The technical solutions provided by the embodiments of this disclosure may include the following beneficial effects: the lubrication method of the differential provided by this disclosure adopts an intermittent lubrication strategy according to the real-time driving speed of the vehicle when the disengagement device makes the differential and the half shaft disengage. Among these factors, vehicle speed is easily measurable, and its correlation with the differential's speed difference in the disengaged state is high. Based on this, controlling the operation of the electric drive motor and oil pump motor allows for precise adaptation to the differential's actual lubrication needs, ensuring effective lubrication. The intermittent lubrication control strategy involves controlling the electric drive motor at a preset speed, stopping after each preset running time, and then restarting after intermittent preset shutdown times. Similarly, the oil pump motor is controlled at a preset speed, stopping after each preset running time, and then restarting after intermittent preset shutdown times. This intermittent lubrication strategy, designed with start-stop rhythms based on actual lubrication needs, avoids energy waste caused by continuous operation of the electric drive motor and oil pump motor, and also helps prevent insufficient lubrication due to prolonged shutdowns. This allows for on-demand lubrication replenishment, ensuring the vehicle's range.

[0008] In some possible implementations, multiple consecutive driving speed ranges are configured, wherein each driving speed range corresponds to a set of preset electric drive motor operating conditions, and / or each driving speed range corresponds to a set of preset oil pump motor operating conditions. The lubrication method for the differential includes: Obtain the speed range corresponding to the current vehicle speed; Based on the obtained driving speed range, the electric drive motor is controlled to operate in the preset electric drive motor condition corresponding to the driving speed range, and the oil pump motor is controlled to operate in the preset oil pump motor condition corresponding to the driving speed range.

[0009] By adjusting the preset operating conditions of the electric drive motor and the oil pump motor according to the driving speed range, the operating conditions of the electric drive motor and the oil pump are only adjusted when the vehicle's driving speed changes across the range. This helps to avoid frequent switching of the operating conditions of the electric drive motor and the oil pump motor caused by small and instantaneous fluctuations in the vehicle's driving speed, thereby avoiding additional energy consumption caused by frequent adjustment of operating conditions.

[0010] In some possible implementations, within multiple consecutive driving speed ranges, the preset electric drive motor speed, preset electric drive motor operating time, preset oil pump motor speed, and preset oil pump motor operating time corresponding to the high-speed range are all greater than those of the low-speed range; the preset electric drive motor shutdown time and preset oil pump motor shutdown time corresponding to the high-speed range are both less than those of the low-speed range. This achieves adaptation between motor operating conditions and actual lubrication requirements, avoiding insufficient lubrication at high speeds and energy waste at low speeds, balancing lubrication effectiveness and energy economy, and improving the vehicle's range.

[0011] In some possible implementations, within multiple consecutive speed ranges, the length of the low-speed range is greater than the length of the high-speed range. When the vehicle is traveling at low speeds, a longer low-speed range reduces the frequency of motor operating condition switching caused by small fluctuations in vehicle speed, thus reducing energy consumption. Conversely, when the vehicle is traveling at high speeds, a shorter driving range allows for a faster response to speed changes, ensuring lubrication compatibility under high-speed conditions, further reducing overall vehicle energy consumption, and ensuring the vehicle's range.

[0012] In some possible implementations, the lubrication method for the differential includes: When the obtained vehicle speed deviates from the current driving speed range, and the duration of the deviation is greater than or equal to a preset deviation duration, the electric drive motor is controlled to operate in the preset electric drive motor condition corresponding to the new driving speed range, and the oil pump motor is controlled to operate in the preset oil pump motor condition corresponding to the new driving speed range.

[0013] This prevents frequent changes in the operating conditions of the electric drive motor and oil pump caused by sudden changes in vehicle speed at the boundary of the interval, avoids the extra energy consumption caused by frequent switching of operating conditions, and further reduces the energy consumption of lubrication.

[0014] In some possible implementations, during a lubrication cycle, the sum of the preset electric drive motor running time and the preset electric drive motor shutdown time is equal to the sum of the preset oil pump motor running time and the preset oil pump motor shutdown time, and the preset electric drive motor running time is less than or equal to the preset oil pump motor running time. This ensures that the electric drive motor and oil pump motor start and operate synchronously during the lubrication phase, guaranteeing that the oil pump motor is continuously supplying oil throughout the entire operation of the electric drive motor. This ensures that the differential receives a stable supply of lubricating oil throughout the entire operation of the electric drive motor, meeting the differential's lubrication replenishment requirements.

[0015] In some possible implementations, the lubrication method for the differential further includes: The vehicle's operating status is obtained, including whether the vehicle is stopped or started. When the vehicle is in the starting condition and there is no lubrication action within a preset unlubricated time, the electric drive motor is controlled to run at the electric drive motor self-lubricating speed, and the oil pump motor is controlled to run at the oil pump motor self-lubricating speed, and the electric drive motor and the oil pump motor run for the same amount of time.

[0016] This allows lubrication to stop when the vehicle is parked, reducing energy consumption. In response to insufficient lubrication that may result from frequent starts and stops of vehicles in congested areas, the system can promptly self-lubricate the vehicle by judging the start-up condition. At the same time, since the pre-set unlubricated time is a condition that must be met simultaneously for self-lubrication to start, lubrication is achieved on demand while avoiding energy waste, thus balancing lubrication effectiveness and energy economy.

[0017] According to a second aspect of the present disclosure, a lubrication system for a differential is provided, for implementing the lubrication method of the differential according to any of the above claims, the lubrication system for the differential comprising: Differential; A disengagement device for disengaging or engaging the differential with the half-shaft, which is connected to the wheel; An electric drive motor is used to drive the differential housing of the differential to rotate; and An oil pump is used to inject lubricating oil into the differential.

[0018] According to a third aspect of the present disclosure, a vehicle is provided, comprising a lubrication system for the differential of any of the above-described embodiments.

[0019] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium is provided, having stored thereon computer program instructions that, when executed by a processor, implement the differential lubrication method provided in the first aspect of the present disclosure.

[0020] According to a fifth aspect of the present disclosure, a computer program product is provided, including computer program instructions that, when executed by a processor, implement the lubrication method for a differential according to the first aspect of the present disclosure.

[0021] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0022] The accompanying drawings, which are incorporated in and form a part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure.

[0023] Figure 1 This is a flowchart illustrating a lubrication method for a differential according to an exemplary embodiment.

[0024] Figure 2 This is a flowchart illustrating another method for lubricating a differential according to an exemplary embodiment.

[0025] Figure 3 This is a flowchart illustrating yet another method for lubricating a differential according to an exemplary embodiment.

[0026] Figure 4 This is a schematic diagram of the structure of a differential according to an exemplary embodiment.

[0027] Figure 5 This is a block diagram illustrating a lubrication system for a differential according to an exemplary embodiment.

[0028] Explanation of reference numerals in the attached figures 1-Positioning pin, 2-First planetary gear washer, 3-First half-shaft gear, 4-First half-shaft gear washer, 5-First planetary gear, 6-Differential housing, 7-Second planetary gear, 8-Second half-shaft gear washer, 9-Second half-shaft gear, 10-Second planetary gear washer, 11-Slotted shaft, 12-First half-shaft, 13-Second half-shaft, 100-Differential, 200-Disengagement device, 300-Electric drive motor, 400-Oil pump. Detailed Implementation

[0029] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numerals in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0030] It should be noted that all actions involving the acquisition of signals, information, or data in this disclosure are carried out in compliance with the relevant data protection laws and policies of the country where the location is situated, and with authorization from the owner of the relevant device.

[0031] Figure 4This is an example of a differential. Taking the disengagement device 200 for disengaging the transmission between the second half-shaft gear 9 and the second half-shaft 13 as an example, the left wheel of the vehicle receives power, which is transmitted through the first half-shaft 12 to the first half-shaft gear 3. The first planetary gear 5 and the second planetary gear 7 are supported and fixed by a slotted shaft 11. The first planetary gear 5 engages with the first half-shaft gear 3, and the second planetary gear 7 engages with the second half-shaft gear 9, ultimately transmitting power to the second half-shaft gear 9. The first half-shaft gear 3 and the second half-shaft gear 9 rotate in opposite directions, and there is a speed difference between the first half-shaft 12 and the second half-shaft 13, which increases with vehicle speed. Under disengagement conditions, due to the speed difference between the first half-shaft 12 and the second half-shaft 13, insufficient lubrication of the differential components can lead to accelerated wear and eventual component failure. Therefore, lubrication is necessary to ensure the normal functioning of the differential components. However, the lubrication strategies in related technologies consume significant energy, which is detrimental to maintaining the vehicle's range.

[0032] To address the technical problems existing in related technologies, this disclosure provides a differential lubrication method, a differential lubrication system, a vehicle, a non-transitory computer-readable storage medium, and a computer program product. Among them, Figure 1 The diagram illustrates a lubrication method for a differential. The method includes: with the differential and half-shaft disengaged by a disengagement device, acquiring the current vehicle speed; and, based on the acquired current vehicle speed, controlling the electric drive motor to operate under preset electric drive motor operating conditions and controlling the oil pump motor to operate under preset oil pump motor operating conditions. Operating under preset electric drive motor operating conditions includes: operating at a preset electric drive motor speed, stopping after each preset electric drive motor operation for a preset duration, and then restarting after intermittent preset shutdown durations. Operating under preset oil pump motor operating conditions includes: operating at a preset oil pump motor speed, stopping after each preset oil pump motor operation for a preset duration, and then restarting after intermittent preset shutdown durations.

[0033] To achieve the above-mentioned lubrication method for the differential, such as Figure 5 As shown, this disclosure also provides a lubrication system for a differential, comprising: a differential 100, a disengagement device 200, an electric drive motor 300, and an oil pump 400. The disengagement device 200 is used to disengage or engage the differential with the half-shaft, which is connected to the wheel. The electric drive motor 300 drives the differential housing 6 of the differential 100 to rotate. The oil pump 400 sprays lubricating oil into the differential 100. Taking an electric drive assembly where the differential 100 is located between the reducer and the half-shaft as an example, the electric drive motor 300 transmits power to the differential housing 6 through the reducer. The differential housing 6 drives the internal planetary gears, which transmit power to the half-shaft gears through meshing. The movement of the differential housing 6 agitates the lubricating oil, thereby lubricating the components inside the differential 100.

[0034] The differential lubrication method disclosed herein employs an intermittent lubrication strategy based on the real-time vehicle speed when the differential 100 is disengaged from the half-shaft by the disengagement device 200. The vehicle speed is easily measurable, for example, by a vehicle speed sensor. As previously described, the speed difference of the differential 100 increases with increasing vehicle speed, meaning there is a high correlation between the vehicle speed and the speed difference of the differential 100 in the disengaged state. Based on this, the operating states of the electric drive motor 300 and the oil pump motor are controlled, enabling precise adaptation to the actual lubrication needs of the differential 100 and ensuring effective lubrication.

[0035] The intermittent lubrication control strategy involves controlling the electric drive motor at a preset speed, running for a preset duration each time, then stopping, and then restarting after an intermittent preset shutdown duration. Similarly, the oil pump motor is controlled at a preset speed, running for a preset duration each time, then stopping, and then restarting after an intermittent preset shutdown duration. Here, "restarting" refers to repeatedly cycling the preset electric drive motor speed and running duration. This intermittent lubrication strategy, designed with start-stop rhythms based on actual lubrication needs, avoids energy waste caused by continuous operation of the electric drive motor and oil pump motor, and also helps prevent insufficient lubrication due to prolonged shutdowns. This allows for on-demand lubrication replenishment, ensuring the vehicle's range.

[0036] Different vehicle speeds correspond to different preset electric drive motor operating conditions and preset oil pump motor operating conditions, taking into account both improving lubrication effect and reducing energy consumption. Specific values ​​can be obtained through test calibration, and this disclosure does not limit them.

[0037] In some possible implementations, a set of preset electric drive motor operating conditions and preset oil pump motor operating conditions can be configured for each driving speed point value. In other possible implementations, multiple consecutive driving speed ranges are configured, wherein each driving speed range corresponds to a set of preset electric drive motor operating conditions, and / or each driving speed range corresponds to a set of preset oil pump motor operating conditions. That is, multiple consecutive driving speed points fall within the same driving speed range, thereby multiple consecutive driving speed points share a set of preset electric drive motor operating conditions and preset oil pump motor operating conditions.

[0038] Based on an implementation method with multiple consecutive driving speed ranges, such as Figure 2 As shown, the lubrication method for the differential provided in this disclosure includes: obtaining a driving speed range corresponding to the current vehicle driving speed; and controlling the electric drive motor to operate in a preset electric drive motor condition corresponding to the driving speed range, and controlling the oil pump motor to operate in a preset oil pump motor condition corresponding to the driving speed range, based on the obtained driving speed range.

[0039] This method of adjusting the preset operating conditions of the electric drive motor and the oil pump motor according to the driving speed range ensures that the operating conditions of the electric drive motor and the oil pump are adjusted only when the vehicle's driving speed changes across the range. This helps to avoid frequent switching of the operating conditions of the electric drive motor 300 and the oil pump motor caused by small and instantaneous fluctuations in the vehicle's driving speed, thereby avoiding additional energy consumption during frequent adjustment of operating conditions.

[0040] Real-time vehicle speed may fluctuate at the boundaries between adjacent speed ranges, causing abrupt changes in lubrication strategies. Therefore, such as... Figure 3 As shown, in some possible implementations, the lubrication method for the differential provided in this disclosure includes: when the acquired vehicle speed deviates from the current driving speed range, and the duration of the deviation is greater than or equal to a preset deviation duration, controlling the electric drive motor to operate in a preset electric drive motor condition corresponding to the new driving speed range, and controlling the oil pump motor to operate in a preset oil pump motor condition corresponding to the new driving speed range.

[0041] In other words, by adding a hysteresis judgment method, if the vehicle speed only briefly deviates from the current driving speed range, the current preset electric drive motor operating condition and preset oil pump motor operating condition will not be adjusted. Adjustments will only be made when the vehicle speed deviates continuously for a duration equal to or greater than the deviation duration. This prevents frequent changes in the operating conditions of the electric drive motor 300 and oil pump caused by sudden changes in vehicle speed at the boundaries of the speed range, avoiding the additional energy consumption caused by frequent switching of operating conditions and further reducing lubrication energy consumption.

[0042] To further differentiate the operating conditions of the electric drive motor and oil pump motor in different driving speed ranges, in some possible implementations, in multiple consecutive driving speed ranges, the preset electric drive motor speed, preset electric drive motor running time, preset oil pump motor speed, and preset oil pump motor running time corresponding to the high-speed range are all greater than those of the low-speed range; the preset electric drive motor shutdown time and preset oil pump motor shutdown time corresponding to the high-speed range are all less than those of the low-speed range.

[0043] It should be noted that the low-speed range and high-speed range here do not refer to a speed below a certain speed value and a speed above a certain speed value as a high-speed range, but rather to a relative comparison, such as between two adjacent driving speed ranges or between two intervening driving speed ranges.

[0044] For example, the driving speed ranges from low to high are: Spd_1-Spd_2, Spd_2-Spd_3...Spd_K-Spd_K+1; the electric drive motor speeds from low to high are: N_Motor_1, N_Motor_2...N_Motor_K; the electric drive motor running times from shortest to longest are: T_Motor_working_1, T_Motor_working_2...T_Motor_working_K; and the electric drive motor stopping times from longest to shortest are: T_Motor_del ta_1, T_Motor_delta_2……T_Motor_delta_K; the oil pump motor speeds from low to high are: N_Eop_1, N_Eop_2……N_Eop_K; the oil pump motor running times from short to long are: T_Eop_working_1, T_Eop_working_2……T_Eop_working_K; the oil pump motor downtimes from long to short are: T_Eop_delta_1, T_Eop_delta_2……T_Eop_delta_K.

[0045] Table 1 .

[0046] Taking a real-time driving speed within the range Spd_1-Spd_2 as an example, the electric drive motor's speed is N_Motor_1, and the duration of a single lubrication cycle is T_Motor_working_1. The motor's downtime is T_Motor_delta_1. That is, the electric drive motor 300 runs at speed N_Motor_1 for a period of time T_Motor_working_1, then stops for a period of time T_Motor_delta_1, and then starts running again, repeating this cycle. Similarly, the oil pump motor's speed is N_Eop_1, the duration of a single lubrication cycle is T_Eop_working_1, and the downtime is T_Eop_delta_1. That is, the oil pump motor runs at speed N_Eop_1 for a period of time T_Eop_working_1, then stops for a period of time T_Eop_delta_1, and then starts running again, repeating this cycle.

[0047] When the vehicle is traveling at high speed, the differential 100 has a larger speed difference when disengaged, resulting in higher lubrication requirements. By increasing the speed of the electric drive motor 300 and the oil pump motor, extending their operating time, and shortening their downtime, lubrication can be replenished quickly to meet the lubrication needs under high-speed conditions. When the vehicle is traveling at low speed, the differential 100 has a smaller speed difference, resulting in lower lubrication requirements. By reducing the speed of the electric drive motor 300 and the oil pump motor, shortening their operating time, and extending their downtime, redundant lubrication supply under low-speed conditions can be avoided. This achieves adaptation between motor operating conditions and actual lubrication needs, avoiding insufficient lubrication at high speeds and energy waste at low speeds, balancing lubrication effectiveness and energy economy, and improving the vehicle's range.

[0048] Multiple consecutive speed ranges can be of equal or unequal length. In some possible implementations, the length of the low-speed range is greater than the length of the high-speed range. When the vehicle is traveling at low speeds, a longer low-speed range reduces the frequency of motor switching caused by small fluctuations in vehicle speed, thus reducing energy consumption. Conversely, when the vehicle is traveling at high speeds, a shorter range allows for a faster response to speed changes, ensuring lubrication compatibility under high-speed conditions, further reducing overall vehicle energy consumption and ensuring the vehicle's range.

[0049] To ensure a continuous and effective supply of lubricating oil to the differential 100 during the operation of the electric drive motor 300, in some possible embodiments, the sum of the preset electric drive motor running time and the preset electric drive motor stopping time in a lubrication cycle is equal to the sum of the preset oil pump motor running time and the preset oil pump motor stopping time, and the preset electric drive motor running time is less than or equal to the preset oil pump motor running time. It should be noted that a lubrication cycle refers to a complete cycle of the electric drive motor running for a preset time and intermittently stopping for a preset time, which is also a complete cycle of the oil pump motor running for a preset time and intermittently stopping for a preset time. This ensures that the electric drive motor 300 and the oil pump motor start and operate synchronously during the lubrication phase, ensuring that the oil pump motor is in a continuous oil supply state throughout the entire operation of the electric drive motor 300, and that the differential 100 receives a stable supply of lubricating oil throughout the entire operation of the electric drive motor 300, meeting the lubrication replenishment needs of the differential 100.

[0050] To adapt the differential lubrication method provided in this disclosure to diverse vehicle driving conditions, such as acceleration and deceleration, driving in congested areas, and high-speed cruising, in some possible embodiments, the differential lubrication method further includes: acquiring the vehicle's operating state, including stopping and starting; and when the vehicle is in a starting condition and there is no lubrication action within a preset unlubricated time, controlling the electric drive motor to operate at its self-lubricating speed and controlling the oil pump motor to operate at its self-lubricating speed, with the electric drive motor and oil pump motor operating for the same amount of time.

[0051] This setting allows lubrication to stop when the vehicle is parked, reducing energy consumption. In response to insufficient lubrication that may be caused by frequent starts and stops of vehicles in congested areas, the system can promptly perform self-lubrication by judging the start-up condition. At the same time, since the pre-set unlubricated time is a condition that must be met to start self-lubrication, lubrication is achieved on demand while avoiding energy waste, thus balancing lubrication effectiveness and energy economy.

[0052] According to a second aspect of the present disclosure, a lubrication system for a differential is also provided, for implementing the lubrication method for the differential described in any of the above claims. The lubrication system for the differential includes: a differential 100, a disengagement device 200, an electric drive motor 300, and an oil pump 400. The disengagement device 200 is used to disengage or engage the differential 100 with a half-shaft, the half-shaft being connected to a wheel; the electric drive motor 300 is used to drive the differential housing 6 of the differential 100 to rotate; and the oil pump is used to spray lubricating oil into the differential 100.

[0053] According to a third aspect of the present disclosure, a vehicle is also provided, including any of the vehicles described above, and having all of its beneficial effects.

[0054] According to a fourth aspect of the present disclosure, a non-transitory computer-readable storage medium storing computer program instructions is also provided. For example, a memory including a computer program. When the computer program is executed by a processor, it implements the differential lubrication method described above. For example, the non-transitory computer-readable storage medium may be a ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, and optical data storage device, etc.

[0055] According to a fifth aspect of the present disclosure, a computer program product is also provided, including computer program instructions. The computer program product includes computer program instructions executable by a programmable device, the computer program instructions having, when executed by the programmable device, the function of performing the aforementioned lubrication method for a differential.

[0056] Furthermore, the term “exemplary” is used herein to mean serving as an example, instance, or illustration. Any aspect or design described herein as “exemplary” is not necessarily to be construed as advantageous compared to other aspects or designs. Rather, the use of the term “exemplary” is intended to present the concept in a concrete manner. As used herein, the term “or” is intended to mean an inclusive “or” rather than an exclusive “or.” That is, unless otherwise specified or clear from the context, “X applies A or B” is intended to mean any of the natural inclusive arrangements. That is, “X applies A or B” satisfies any of the foregoing instances if X applies A; X applies B; or both X applies A and B. Additionally, unless otherwise specified or clear from the context to refer to the singular form, the articles “a” and “an” as used in this application and the appended claims are generally understood to mean “one or more.”

[0057] Similarly, although this disclosure has been shown and described with respect to one or more implementations, equivalent variations and modifications will occur to those skilled in the art upon reading and understanding this specification and the accompanying drawings. This disclosure includes all such modifications and variations and is limited only by the scope of the claims. In particular, with respect to the various functions performed by the components described above (e.g., elements, resources, etc.), unless otherwise indicated, the terminology used to describe such components is intended to correspond to any component (functionally equivalent) that performs the specific function of the described component, even if structurally not equivalent to the disclosed structure. Furthermore, although specific features of this disclosure may have been disclosed with respect to only one of several implementations, such features may be combined with one or more other features of other implementations, as may be desired and advantageous to any given or particular application. Moreover, with regard to the terms “comprising,” “owning,” “having,” “having,” or variations thereof as used in the detailed description or claims, such terms are intended to be inclusive in a manner similar to the term “including.”

[0058] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0059] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A lubrication method for a differential, characterized in that, include: With the differential and half-shaft disengaged by the disengagement device, the current vehicle speed is obtained. Based on the obtained current vehicle speed, the electric drive motor is controlled to operate under preset electric drive motor conditions, and the oil pump motor is controlled to operate under preset oil pump motor conditions; wherein: Operating under preset electric drive motor conditions includes: operating at a preset electric drive motor speed, stopping after each preset electric drive motor running time, and restarting after intermittent preset electric drive motor stop times; Operating under preset oil pump motor conditions includes: operating at a preset oil pump motor speed, stopping after a preset oil pump motor running time each time, and restarting after an intermittent preset oil pump motor stop time.

2. The lubrication method for the differential according to claim 1, characterized in that, It is configured with multiple continuous driving speed ranges, wherein each driving speed range corresponds to a set of preset electric drive motor operating conditions, and / or each driving speed range corresponds to a set of preset oil pump motor operating conditions; The lubrication method for the differential includes: Obtain the speed range corresponding to the current vehicle speed; Based on the obtained driving speed range, the electric drive motor is controlled to operate in the preset electric drive motor condition corresponding to the driving speed range, and the oil pump motor is controlled to operate in the preset oil pump motor condition corresponding to the driving speed range.

3. The lubrication method for the differential according to claim 2, characterized in that, In multiple consecutive driving speed ranges, the preset electric drive motor speed, preset electric drive motor running time, preset oil pump motor speed, and preset oil pump motor running time corresponding to the driving speed range in the high-speed range are all greater than those in the low-speed range; the preset electric drive motor shutdown time and preset oil pump motor shutdown time corresponding to the driving speed range in the high-speed range are all less than those in the low-speed range.

4. The lubrication method for the differential according to claim 3, characterized in that, In a plurality of consecutive driving speed ranges, the length of the driving speed range in the low-speed segment is greater than the length of the driving speed range in the high-speed segment.

5. The lubrication method for the differential according to claim 2, characterized in that, The lubrication method for the differential includes: When the obtained vehicle speed deviates from the current driving speed range, and the duration of the deviation is greater than or equal to a preset deviation duration, the electric drive motor is controlled to operate in the preset electric drive motor condition corresponding to the new driving speed range, and the oil pump motor is controlled to operate in the preset oil pump motor condition corresponding to the new driving speed range.

6. The lubrication method for the differential according to claim 1, characterized in that, In a lubrication cycle, the sum of the preset electric drive motor running time and the preset electric drive motor shutdown time is equal to the sum of the preset oil pump motor running time and the preset oil pump motor shutdown time, and the preset electric drive motor running time is less than or equal to the preset oil pump motor running time.

7. The lubrication method for the differential according to claim 1, characterized in that, The lubrication method for the differential also includes: The vehicle's operating status is obtained, including whether the vehicle is stopped or started. When the vehicle is in the starting condition and there is no lubrication action within a preset unlubricated time, the electric drive motor is controlled to run at the electric drive motor self-lubricating speed, and the oil pump motor is controlled to run at the oil pump motor self-lubricating speed, and the electric drive motor and the oil pump motor run for the same amount of time.

8. A lubrication system for a differential, characterized in that, A lubrication method for implementing a differential according to any one of claims 1-7, wherein the lubrication system of the differential comprises: Differential; A disengagement device for disengaging or engaging the differential with the half-shaft, which is connected to the wheel; An electric drive motor is used to drive the differential housing of the differential to rotate; and An oil pump is used to inject lubricating oil into the differential.

9. A vehicle, characterized in that, The lubrication system includes the differential as described in claim 8.

10. A non-transitory computer-readable storage medium storing computer program instructions, characterized in that, When the computer program instructions are executed by the processor, they implement the lubrication method for the differential as described in any one of claims 1-7.

11. A computer program product comprising computer program instructions, characterized in that, When the computer program instructions are executed by the processor, they implement the lubrication method for the differential as described in any one of claims 1-7.

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