An electric drive axle lubrication protection method and device, vehicle and storage medium

Abstract

The application discloses a kind of electric drive axle lubrication protection method, device, vehicle and storage medium.The electric drive axle lubrication protection method includes: obtaining the current oil temperature of electric drive axle lubricating oil, and when the current oil temperature is lower than low temperature setting value, control vehicle enters low temperature lubrication protection mode, control drive motor and electronic oil pump operation to make lubricating oil circuit circulation;Obtain the current gear of vehicle in the process of lubricating oil circuit circulation, and when the current gear is empty, determine high-frequency pulse current according to current oil temperature, to heat electric drive axle lubricating oil by high-frequency pulse current;According to the target oil temperature of heated electric drive axle lubricating oil, adjust the operating state of drive motor and electronic oil pump.The application realizes covering full oil temperature interval by controlling drive motor and electronic oil pump to run with different strategies to achieve lubrication protection for bearings and gears, reduce the risk of electronic oil pump damage, and protect the efficient operation of electric drive axle.

Description

Technical Field

[0001] This invention relates to the field of vehicle component technology, and in particular to a method, device, vehicle, and storage medium for lubrication protection of an electric drive axle. Background Technology

[0002] Integrated electric drive axles, by highly integrating the reducer, motor, and motor controller, can significantly improve the power output of the axle assembly and reduce energy consumption, while also meeting the compact chassis layout requirements of new energy commercial vehicles. This has made it a key technological direction for new energy vehicle power systems. The lubrication of bearings and gears, and the cooling of the motor, directly affect the performance of the electric drive assembly; therefore, improving lubrication and cooling performance has become a research hotspot in the field of electric drive axle technology.

[0003] Currently, water-cooled electric drive bridges lubricate the reducer bearings and gears through splash lubrication and cool the motor through water channels. This passive lubrication method is prone to failure under low-temperature conditions, leading to insufficient lubrication and subsequent burning of bearings and gears. Oil-cooled electric drive bridges use an electronic oil pump to allow cooling oil to directly contact the motor, reducer, bearings, gears, and other components, achieving more efficient cooling and more precise lubrication, which can greatly improve the efficiency of the electric drive system. However, in low-temperature environments, the lubricating oil becomes viscous or even solidifies. At this time, the oil pump requires a large starting current, and because the lubricating oil is not properly lubricated, the drive motor is still running at high speed, posing a significant risk of burning of bearings, gears, and other components. Summary of the Invention

[0004] This invention provides a method, device, vehicle, and storage medium for lubricating and protecting electric drive axles, in order to solve the current problems of insufficient lubrication of electric drive axles in low-temperature environments, which leads to bearing burnout and damage to the oil pump due to high current startup.

[0005] According to one aspect of the present invention, a method for protecting the lubrication of an electric drive bridge is provided, the method comprising:

[0006] The current oil temperature of the electric drive axle lubricating oil is obtained, and when the current oil temperature is lower than the low temperature set value, the vehicle is controlled to enter the low temperature lubrication protection mode, and the drive motor and electronic oil pump are controlled to operate so that the lubricating oil circuit is circulated.

[0007] The current gear position of the vehicle is obtained during the circulation of lubricating oil. When the current gear position is neutral, a high-frequency pulse current is determined based on the current oil temperature to heat the lubricating oil of the electric drive axle through the high-frequency pulse current.

[0008] Adjust the operating status of the drive motor and electronic oil pump according to the target oil temperature of the electric drive axle lubricating oil after heating.

[0009] Optionally, the initial oil temperature of the electric drive axle lubricating oil is obtained, including:

[0010] When the oil temperature sensor is found to be fault-free, the initial oil temperature of the electric drive axle lubricating oil is collected using the oil temperature sensor; or,

[0011] When a fault is detected in the oil temperature sensor, the initial oil temperature of the electric drive axle lubricating oil is estimated based on the initial oil pressure of the electric drive axle lubricating oil using the oil temperature-oil pressure calibration table.

[0012] Optionally, after heating the electric drive bridge lubricating oil with a high-frequency pulsed current, the method further includes:

[0013] If the gear is still in neutral at the current moment, and the current oil temperature increases by the set temperature threshold, then the current oil temperature increases by the set temperature threshold as the target oil temperature of the electric drive axle lubricating oil after heating.

[0014] If the gear is still in neutral at the current moment and the current oil temperature has not increased to the set temperature threshold, the electric drive axle lubricating oil will continue to be heated by high-frequency pulse current.

[0015] Optionally, the operating status of the drive motor and electronic oil pump can be adjusted according to the target oil temperature of the electric drive axle lubricating oil after heating, including:

[0016] If the target oil temperature is lower than the first temperature setting value, the drive motor is controlled to change within the first speed range, and the electronic oil pump operates at the first speed threshold.

[0017] If the target oil temperature is greater than or equal to the first temperature setting value and less than the second temperature setting value, the drive motor is controlled to change within the second speed range, and the electronic oil pump operates at the second speed threshold.

[0018] If the target oil temperature is greater than or equal to the second temperature setting value and less than the third temperature setting value, the drive motor is controlled to change within the third speed range, and the electronic oil pump operates at the third speed threshold.

[0019] The first temperature setting is less than the second temperature setting, and the second temperature setting is less than the third temperature setting.

[0020] Optionally, after obtaining the vehicle's current gear position during the lubrication oil circulation process, the following may also be included:

[0021] When the gear is in gear at the current moment, obtain the rate of change of the drive motor speed;

[0022] If the rate of change of engine speed is greater than the set rate of change, the vehicle will be controlled to enter the idling protection mode until the rate of change of engine speed is less than or equal to the set rate of change, at which point the vehicle will be controlled to exit the idling protection mode.

[0023] Optionally, after obtaining the vehicle's current gear position during the lubrication oil circulation process, the following may also be included:

[0024] The gear is in gear at the current moment, and the rate of change of engine speed is less than or equal to the set rate of change.

[0025] If the initial oil temperature is lower than the first temperature setting value, the drive motor torque is limited to the first torque percentage, and the electronic oil pump operates at the first speed threshold.

[0026] If the initial oil temperature is greater than or equal to the first temperature setting value and the target oil temperature is less than the second temperature setting value, the drive motor torque is limited to the second torque percentage, and the electronic oil pump operates at the second speed threshold.

[0027] If the initial oil temperature is greater than or equal to the second temperature setting value and the target oil temperature is less than the third temperature setting value, the drive motor torque is limited to the third torque percentage, and the electronic oil pump operates at the third speed threshold.

[0028] Among them, the first torque percentage is less than the second torque percentage, and the second torque percentage is less than the third torque percentage.

[0029] Optionally, the lubrication protection method for the electric drive bridge also includes:

[0030] If the current oil temperature or target oil temperature is not lower than the low temperature setting value, and the current oil temperature or target oil temperature is lower than the normal temperature setting value, then the vehicle will be controlled to enter the normal lubrication protection mode.

[0031] If the current oil temperature or target oil temperature is not lower than the normal temperature setting value, and the current oil temperature or target oil temperature is lower than the high temperature setting value, then the vehicle will be controlled to enter the high temperature lubrication protection mode.

[0032] If the current oil temperature or target oil temperature is not lower than the high temperature setting, the vehicle will be stopped for inspection.

[0033] According to another aspect of the present invention, an electric drive bridge lubrication protection device is provided, the electric drive bridge lubrication protection device comprising:

[0034] The lubrication circuit circulation module is used to obtain the current oil temperature of the electric drive axle lubricating oil, and when the current oil temperature is lower than the low temperature set value, control the vehicle to enter the low temperature lubrication protection mode, and control the drive motor and electronic oil pump to operate so that the lubrication circuit circulates.

[0035] The electric drive axle lubricating oil heating module is used to obtain the vehicle's current gear position during the lubricating oil circulation process, and when the current gear position is neutral, determine the high-frequency pulse current based on the current oil temperature to heat the electric drive axle lubricating oil through the high-frequency pulse current.

[0036] The electric drive axle lubrication protection module is used to adjust the operating status of the drive motor and electronic oil pump according to the target oil temperature of the heated electric drive axle lubricating oil.

[0037] According to another aspect of the present invention, a vehicle is provided, the vehicle including an electric drive axle, the electric drive axle including a drive motor and an electronic oil pump, the drive motor driving the electronic oil pump to match the lubrication requirements of the electric drive axle;

[0038] The vehicles also include:

[0039] At least one processor; and,

[0040] A memory that is communicatively connected to at least one processor; wherein,

[0041] The memory stores a computer program that can be executed by at least one processor, such that the at least one processor is able to perform the electric drive bridge lubrication protection method according to any embodiment of the present invention.

[0042] According to another aspect of the present invention, a computer-readable storage medium is provided, which stores computer instructions for causing a processor to execute and implement the electric drive bridge lubrication protection method of any embodiment of the present invention.

[0043] The technical solution of this invention involves acquiring the current oil temperature of the electric drive axle lubricating oil and controlling the vehicle to enter a low-temperature lubrication protection mode when the current oil temperature is lower than a low-temperature set value. This mode controls the operation of the drive motor and the electronic oil pump to circulate the lubricating oil. Furthermore, it acquires the vehicle's current gear position during the lubricating oil circulation process. When the current gear is neutral, it determines a high-frequency pulse current based on the current oil temperature to heat the electric drive axle lubricating oil. This utilizes motor pulse self-heating technology to heat the lubricating oil at low temperatures, thereby achieving lubrication protection. Finally, based on the target oil temperature of the heated electric drive axle lubricating oil, it adjusts the operating state of the drive motor and the electronic oil pump. This achieves lubrication protection of bearings and gears by controlling the drive motor and the electronic oil pump to operate with different strategies across the entire oil temperature range, reducing the risk of electronic oil pump damage and ensuring efficient operation of the electric drive axle.

[0044] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0045] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0046] Figure 1This is a flowchart of a lubrication protection method for an electric drive bridge according to an embodiment of the present invention;

[0047] Figure 2 This is a flowchart of a lubrication protection method for an electric drive bridge according to an embodiment of the present invention;

[0048] Figure 3 This is a flowchart of a lubrication protection method for an electric drive bridge according to an embodiment of the present invention;

[0049] Figure 4 This is a schematic diagram of the structure of an electric drive bridge lubrication protection device according to an embodiment of the present invention;

[0050] Figure 5 This is a schematic diagram of the structure of a vehicle that implements the electric drive axle lubrication protection method according to an embodiment of the present invention. Detailed Implementation

[0051] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0052] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0053] Figure 1 This invention provides a flowchart of a lubrication protection method for an electric drive axle, applicable to integrated oil-cooled electric drive axles. This lubrication protection method can be executed by an electric drive axle lubrication protection device, which can be implemented in hardware and / or software. This device can be configured in new energy vehicles equipped with integrated electric drive axles. Figure 1 As shown, the lubrication protection method for the electric drive bridge includes:

[0054] S110: Obtain the current oil temperature of the electric drive axle lubricating oil, and when the current oil temperature is lower than the low temperature set value, control the vehicle to enter the low temperature lubrication protection mode, and control the drive motor and electronic oil pump to operate so that the lubricating oil circuit circulates.

[0055] In this embodiment, the oil temperature of the electric drive axle lubricating oil can be collected by an oil temperature sensor. If the oil temperature sensor malfunctions, the oil temperature can be obtained by looking up the oil pressure of the electric drive axle lubricating oil in a table. Specifically, when the oil temperature sensor is detected to be functioning correctly, the initial oil temperature of the electric drive axle lubricating oil is collected by the oil temperature sensor. When the oil temperature sensor is detected to be malfunctioning, the initial oil temperature of the electric drive axle lubricating oil is estimated by referring to the oil temperature and oil pressure calibration table based on the initial oil pressure of the electric drive axle lubricating oil.

[0056] As is known, the initial oil pressure of the electric drive axle lubricating oil can be obtained by existing oil pressure sensors or by other methods, and this embodiment does not impose any restrictions on this.

[0057] The oil temperature and oil pressure calibration table can be obtained by those skilled in the art through repeated experiments. The oil pressure and oil temperature are stored in the oil temperature and oil pressure calibration table. The initial oil temperature of the electric drive axle lubricating oil can be estimated by looking up the oil temperature and oil pressure calibration table with the initial oil pressure.

[0058] The low temperature setting is set based on the minimum temperature limit for the vehicle to enter the low temperature lubrication protection mode. In this embodiment, no special restrictions are placed on the specific value of the low temperature setting.

[0059] For example, taking a low temperature setting of 0°C as an example, when the current oil temperature is below 0°C, the electronic oil pump is turned on, and the drive motor is controlled to run to assist the electronic oil pump in quickly building up oil pressure and circulating the lubricating oil circuit.

[0060] Furthermore, to cover the entire oil temperature range, different strategies are used to control the drive motor and electronic oil pump to achieve lubrication protection for bearings and gears. Specifically, if the current oil temperature is not lower than the low temperature setpoint and is lower than the normal temperature setpoint, the vehicle is controlled to enter the normal lubrication protection mode. In the normal lubrication protection mode, different control strategies are used to control the operation of the drive motor and oil pump based on the motor power. If the current oil temperature is not lower than the normal temperature setpoint and is lower than the high temperature setpoint, the vehicle is controlled to enter the high temperature lubrication protection mode. In the high temperature lubrication protection mode, different control strategies are used to control the operation of the drive motor and oil pump based on the relationship between the current motor power and the peak power. If the current oil temperature is not lower than the high temperature setpoint, the vehicle is controlled to stop for inspection.

[0061] The normal temperature setting is based on the lowest temperature limit at which the vehicle enters normal lubrication protection mode. This embodiment does not impose any special restrictions on the specific value of the low temperature setting. Optionally, the normal temperature setting can be 90°C.

[0062] The high-temperature setting is based on the minimum temperature limit required for the vehicle to enter the high-temperature lubrication protection mode. This embodiment does not impose any special restrictions on the specific value of the low-temperature setting. Optionally, the high-temperature setting can be 140°C.

[0063] S120: Obtain the current gear position of the vehicle during the circulation of lubricating oil, and when the current gear position is neutral, determine the high-frequency pulse current based on the current oil temperature, so as to heat the lubricating oil of the electric drive axle through the high-frequency pulse current.

[0064] Based on the above, after the vehicle enters the low-temperature lubrication protection mode, it can be protected by dual diagnosis of oil pressure and oil temperature. If the oil pressure is abnormal, the machine will stop and report the fault to prevent blockage from damaging the oil pump. If the oil pressure is normal, the current gear position of the vehicle during the circulation of lubricating oil can be obtained. The current gear position can be neutral or in gear.

[0065] Specifically, when the gear is in neutral, the frequency and magnitude of the high-frequency pulse current are determined by consulting the temperature-frequency ammeter based on the current oil temperature. The electronic oil pump is then turned on, with the quadrature axis current preset to 0. The direct axis voltage is obtained by consulting the pulse current magnitude and performing an inverse Park transformation to obtain the voltage vector. This is combined with the high-frequency pulse current frequency to generate a pulse width modulation signal to control the power switch to turn off. The high-frequency pulse current is used to heat the lubricating oil of the electric drive axle. When the current oil temperature changes, the frequency and magnitude of the high-frequency pulse current are dynamically adjusted by consulting the temperature-frequency ammeter to form a closed-loop control.

[0066] Furthermore, after heating the electric drive axle lubricating oil, if the gear is still in neutral at the current moment and the current oil temperature increases by a set temperature threshold, then the current oil temperature increasing by the set temperature threshold is determined as the target oil temperature of the electric drive axle lubricating oil after heating; if the gear is still in neutral at the current moment and the current oil temperature does not increase by the set temperature threshold, then the electric drive axle lubricating oil continues to be heated by high-frequency pulse current.

[0067] The set temperature threshold can be selected and set according to the heating requirements of the motor pulse self-heating technology for lubricating oil. This embodiment does not impose any special restrictions on the specific value of the set temperature threshold. Optionally, the set temperature threshold can be 10°C.

[0068] To prevent bearing burnout due to insufficient lubrication caused by rapid changes in vehicle speed on slippery surfaces, if the vehicle is in gear at the current moment and the rate of change of speed is greater than the set rate of change, the vehicle will be controlled to enter the idling protection mode until the rate of change of speed is less than or equal to the set rate of change, at which point the vehicle will be controlled to exit the idling protection mode.

[0069] Furthermore, at the current moment, the gear is in gear, and the rate of change of speed is less than or equal to the set rate of change; if the initial oil temperature is less than the first temperature setting value, the drive motor torque is limited to a first torque percentage, and the electronic oil pump operates at a first speed threshold; if the initial oil temperature is greater than or equal to the first temperature setting value, and the target oil temperature is less than the second temperature setting value, the drive motor torque is limited to a second torque percentage, and the electronic oil pump operates at a second speed threshold; if the initial oil temperature is greater than or equal to the second temperature setting value, and the target oil temperature is less than the third temperature setting value, the drive motor torque is limited to a third torque percentage, and the electronic oil pump operates at a third speed threshold; wherein, the first torque percentage is less than the second torque percentage, and the second torque percentage is less than the third torque percentage.

[0070] S130. Adjust the operating status of the drive motor and electronic oil pump according to the target oil temperature of the electric drive axle lubricating oil after heating.

[0071] The target oil temperature is determined by increasing the current oil temperature by a set temperature threshold after heating the electric drive axle lubricating oil.

[0072] Specifically, if the target oil temperature is less than the first temperature setting value, the drive motor is controlled to vary within a first speed range, and the electronic oil pump operates at a first speed threshold. If the target oil temperature is greater than or equal to the first temperature setting value and less than the second temperature setting value, the drive motor is controlled to vary within a second speed range, and the electronic oil pump operates at a second speed threshold. If the target oil temperature is greater than or equal to the second temperature setting value and less than the third temperature setting value, the drive motor is controlled to vary within a third speed range, and the electronic oil pump operates at a third speed threshold. Wherein, the first temperature setting value is less than the second temperature setting value, the second temperature setting value is less than the third temperature setting value, the first speed threshold is less than the second speed threshold, and the second speed threshold is less than the third speed threshold.

[0073] Furthermore, if the target oil temperature is not lower than the low temperature setting value and the target oil temperature is lower than the normal temperature setting value, the vehicle will be controlled to enter the normal lubrication protection mode. At this time, if the motor power is below the rated power, the oil pump will run at 1500 rpm; if the motor power is below the rated power, the oil pump will run at 1800 rpm.

[0074] If the target oil temperature is not lower than the normal temperature setting and is lower than the high temperature setting, the vehicle will enter the high-temperature lubrication protection mode. Furthermore, after entering the high-temperature lubrication protection mode, when the motor power is greater than 80% of the peak power, the power is limited to 50%, the electronic oil pump runs at 2000 rpm, increasing the cooling water flow in the heat exchanger for 30 minutes. If the oil temperature is lower than the normal temperature setting (e.g., 90℃), the power is restored to enter the normal lubrication protection mode; otherwise, the machine is stopped for inspection. Similarly, if the motor power is less than 80% of the peak power, the electronic oil pump runs at 2000 rpm, increasing the cooling water flow in the heat exchanger for 30 minutes. If the oil temperature is lower than the normal temperature setting (e.g., 90℃), the power is restored to enter the normal lubrication protection mode; otherwise, the machine is stopped for inspection.

[0075] If the target oil temperature is not lower than the high temperature setting value, the vehicle will be stopped for inspection.

[0076] The technical solution of this invention involves acquiring the current oil temperature of the electric drive axle lubricating oil and controlling the vehicle to enter a low-temperature lubrication protection mode when the current oil temperature is lower than a low-temperature set value. This involves controlling the drive motor and electronic oil pump to circulate the lubricating oil. The invention also acquires the vehicle's current gear position during the lubricating oil circulation process, and when the gear is in neutral, determines a high-frequency pulse current based on the current oil temperature to heat the electric drive axle lubricating oil. Based on the target oil temperature of the heated electric drive axle lubricating oil, the operating status of the drive motor and electronic oil pump is adjusted. This invention solves the problem of insufficient lubrication in electric drive axles at low temperatures, leading to bearing burnout and high-current start-up damage to the oil pump. It achieves lubrication protection for bearings and gears by controlling the drive motor and electronic oil pump to operate with different strategies across the entire oil temperature range, reducing the risk of electronic oil pump damage and ensuring efficient operation of the electric drive axle.

[0077] Based on the same inventive concept, and on the basis described above, Figure 2 This is a flowchart illustrating a lubrication protection method for an electric drive bridge according to an embodiment of the present invention. Based on the above embodiments, this embodiment uses motor pulse self-heating technology, which is used by batteries at low temperatures, to heat the lubricating oil, thereby achieving the effect of lubrication protection, and provides an optional implementation method. For example... Figure 2 As shown, the lubrication protection method for the electric drive bridge includes:

[0078] S210: Obtain the current oil temperature of the electric drive axle lubricating oil.

[0079] S220. Determine whether the current oil temperature is lower than the low temperature setting value. If yes, proceed to step S221; otherwise, proceed to step S250.

[0080] If the current oil temperature is not lower than the low temperature setting value, and the current oil temperature is higher than the low temperature setting value, then further determine whether it is lower than the normal temperature setting value based on the current oil temperature, that is, execute step S250.

[0081] S221. Control the vehicle to enter the low-temperature lubrication protection mode, and control the operation of the drive motor and electronic oil pump to circulate the lubricating oil circuit.

[0082] Specifically, if the current oil temperature is lower than the low temperature set value, the vehicle will be controlled to enter the low temperature lubrication protection mode, and the drive motor and electronic oil pump will be controlled to circulate the lubricating oil circuit.

[0083] S230: Obtain the current gear of the vehicle during the circulation of lubricating oil.

[0084] S231. Determine whether the gear is in neutral at the current moment. If yes, proceed to step S232; otherwise, proceed to step S240.

[0085] S232. Determine the high-frequency pulse current based on the current oil temperature, so as to heat the electric drive bridge lubricating oil through the high-frequency pulse current.

[0086] S233. Determine if there is a gear requirement. If yes, proceed to step S250; otherwise, proceed to step S260.

[0087] S260. Adjust the operating status of the drive motor and electronic oil pump according to the target oil temperature of the electric drive axle lubricating oil after heating.

[0088] S240, Obtain the rate of change of the drive motor speed.

[0089] S241. Determine whether the rate of change of rotational speed is greater than the set rate of change. If yes, proceed to step S242; otherwise, proceed to step S250.

[0090] S242, Control the vehicle to enter the idling protection mode.

[0091] Specifically, if the rate of change of speed is greater than the set rate of change, it indicates that the speed of the drive motor is changing too fast. At this time, the vehicle is determined to be slipping and enters the idling protection mode. At this time, the corresponding torque limit coefficient is obtained by looking up the table according to the rate of change of speed. Until the rate of change of speed is less than or equal to the set rate of change, the vehicle is controlled to exit the idling protection mode. Different control strategies are used to control the operation of the drive motor and oil pump according to the oil temperature.

[0092] S250. Determine whether the current oil temperature or the target oil temperature is lower than the normal temperature setting value. If yes, proceed to step S251; otherwise, proceed to step S252.

[0093] S251, Control the vehicle to enter normal lubrication protection mode.

[0094] For example, taking a normal temperature setting of 90°C as an example, if the current oil temperature or target oil temperature is higher than 0°C and the current oil temperature or target oil temperature is lower than 90°C, the vehicle will be controlled to enter the normal lubrication protection mode, and different control strategies will be used to control the operation of the drive motor and oil pump according to the motor power.

[0095] S252. Determine whether the current oil temperature or the target oil temperature is lower than the high temperature setting value. If yes, proceed to step S253; otherwise, proceed to step S254.

[0096] S253, Control the vehicle to enter the high-temperature lubrication protection mode.

[0097] Based on the above, for example, with a normal temperature setting of 90℃ and a high temperature setting of 140℃, if the current oil temperature or target oil temperature is higher than 90℃ and lower than 140℃, the vehicle is controlled to enter the high temperature lubrication protection mode. Different control strategies are used to control the operation of the drive motor and oil pump according to the relationship between the motor's power at this time and its peak power.

[0098] S254. Control the vehicle to perform a shutdown inspection.

[0099] Based on the above, for example, with a normal temperature setting of 90℃ and a high temperature setting of 140℃, if the current oil temperature or the target oil temperature is higher than 140℃, the vehicle will be stopped for inspection.

[0100] Based on the same inventive concept, and on the basis described above, Figure 3 This is a flowchart of an electric drive axle lubrication protection method provided by an embodiment of the present invention. Based on the above embodiments, this embodiment covers the entire oil temperature range by controlling the drive motor and electronic oil pump to operate with different strategies to achieve lubrication protection for bearings and gears. Step S260 is further refined to provide an optional implementation method. For example... Figure 3 As shown, the lubrication protection method for the electric drive bridge includes:

[0101] S2610. Determine whether the target oil temperature is lower than the first temperature setting value. If yes, proceed to step S2611; otherwise, proceed to step S2620.

[0102] The first temperature setting can be selected and set according to the heating requirements of the motor pulse self-heating technology for lubricating oil. This embodiment does not impose any special restrictions on the specific value of the first temperature setting. Optionally, the first temperature setting can be -40℃.

[0103] S2611, Control the drive motor to vary within a first speed range, and the electronic oil pump to operate at a first speed threshold.

[0104] The first speed range and the first speed threshold can be selected and set according to the requirements of the motor pulse self-heating technology for heating the lubricating oil. In this embodiment, the specific values ​​of the first speed range and the first speed threshold are not specifically limited. Optionally, the first speed range can be between 200 rpm and 700 rpm, and the first speed threshold can be 250 rpm.

[0105] For example, taking a first temperature setting of -40℃, a first speed range of 200rpm to 700rpm, and a first speed threshold of 250rpm as an example, when the target oil temperature is less than -40℃, the drive motor is controlled to vary between 200rpm and 700rpm, and the electronic oil pump runs at 250rpm.

[0106] S2612. Determine if there is a gear requirement. If yes, proceed to step S2613; otherwise, proceed to step S2610.

[0107] S2613. Determine whether the target oil temperature is lower than the first temperature setting value. If yes, proceed to step S2614; otherwise, proceed to step S2613.

[0108] Specifically, if the target oil temperature is determined to be greater than the first temperature setting value, then the target oil temperature is determined again to be less than the first temperature setting value, that is, the process returns to step S2613.

[0109] S2614, limit the drive motor torque to a first torque percentage, and the electronic oil pump operates at a first speed threshold.

[0110] The first torque percentage can be selected and set according to the heating requirements of the motor pulse self-heating technology for lubricating oil. In this embodiment, the specific value of the first torque percentage is not particularly limited. Optionally, the first torque percentage can be 20%, and the first speed threshold can be 500 rpm.

[0111] For example, taking a first temperature setting of -40℃, a first torque percentage of 20%, and a first speed threshold of 500rpm as an example, when the target oil temperature is less than -40℃, the drive motor torque is limited to 20%, and the electronic oil pump operates at 500rpm. It should also be noted that at this time, the torque increases by 2% for every 1 degree Celsius increase in oil temperature.

[0112] S2620. Determine whether the target oil temperature is lower than the second temperature setting value. If yes, proceed to step S2621; otherwise, proceed to step S2630.

[0113] The second temperature setting can be selected and set according to the heating requirements of the lubricating oil using the motor pulse self-heating technology. This embodiment does not impose any special restrictions on the specific value of the second temperature setting. Optionally, the second temperature setting can be -20℃.

[0114] For example, if the second temperature setting is -20°C, and the target oil temperature is greater than -20°C, then it is further determined that the target oil temperature is less than the third temperature setting, i.e., step S2630 is executed.

[0115] S2621, Control the drive motor to vary within a second speed range, and the electronic oil pump to operate at a second speed threshold.

[0116] The second speed range and the second speed threshold can be selected and set according to the requirements of the motor pulse self-heating technology for heating the lubricating oil. In this embodiment, the specific values ​​of the second speed range and the second speed threshold are not specifically limited. Optionally, the second speed range can be between 500 rpm and 1000 rpm, and the second speed threshold can be 500 rpm.

[0117] For example, with a second temperature setting of -20℃, a second speed range of 500rpm to 1000rpm, and a second speed threshold of 500rpm, when the target oil temperature is greater than -40℃ and less than -20℃, the drive motor is controlled to change between 500rpm and 1000rpm, and the electronic oil pump runs at 500rpm.

[0118] S2622. Determine if there is a gear requirement. If yes, proceed to step S2623; otherwise, proceed to step S2620.

[0119] S2623. Determine whether the target oil temperature is lower than the second temperature setting value. If yes, proceed to step S2624; otherwise, proceed to step S2623.

[0120] Specifically, if the target oil temperature is determined to be greater than the second temperature setting value, then the target oil temperature is determined again to be less than the second temperature setting value, that is, the process returns to step S2623.

[0121] S2624, limit the drive motor torque to a second torque percentage, and the electronic oil pump operates at a second speed threshold.

[0122] The second torque percentage can be selected and set according to the heating requirements of the lubricating oil using the motor pulse self-heating technology. This embodiment does not impose any special limitations on the specific value of the second torque percentage. Optionally, the second torque percentage can be 40%, and the second speed threshold can be 800 rpm.

[0123] For example, with a second temperature setting of -20℃, a second torque percentage of 40%, and a second speed threshold of 800rpm, when the target oil temperature is below -20℃, the drive motor torque is limited to 40%, and the electronic oil pump operates at 800rpm. It should also be noted that at this time, the torque increases by 2% for every 1 degree Celsius increase in oil temperature.

[0124] S2630. Determine whether the target oil temperature is lower than the third temperature setting value. If yes, proceed to step S2631; otherwise, proceed to step S250.

[0125] The third temperature setting can be selected and set according to the heating requirements of the lubricating oil using the motor pulse self-heating technology. This embodiment does not impose any special restrictions on the specific value of the third temperature setting. Optionally, the third temperature setting can be 0℃.

[0126] For example, if the third temperature setting is 0°C, and the target oil temperature is greater than 0°C, then it is further determined whether the target oil temperature is lower than the normal temperature setting, i.e., step S250 is executed.

[0127] S2631, control the drive motor to vary within the third speed range, and the electronic oil pump to operate at the third speed threshold.

[0128] The third speed range and the third speed threshold can be selected and set according to the needs of the motor pulse self-heating technology for heating the lubricating oil. This embodiment does not impose special restrictions on the specific values ​​of the third speed range and the third speed threshold. Optionally, the third speed range can be between 1000 rpm and 1500 rpm, and the third speed threshold can be 1000 rpm.

[0129] For example, with the third temperature setting set to 0℃, the third speed range between 1000rpm and 1500rpm, and the third speed threshold set to 1000rpm, when the target oil temperature is greater than -20℃ and less than 0℃, the drive motor is controlled to change between 1000rpm and 1500rpm, and the electronic oil pump runs at 1000rpm.

[0130] S2632. Determine if there is a gear requirement. If yes, proceed to step S2633; otherwise, proceed to step S2630.

[0131] S2633. Determine whether the target oil temperature is lower than the third temperature setting value. If yes, proceed to step S2634; otherwise, proceed to step S2633.

[0132] S2634, limit the drive motor torque to the third torque percentage, and the electronic oil pump operates at the third speed threshold.

[0133] Among them, the first temperature setting value is less than the second temperature setting value, the second temperature setting value is less than the third temperature setting value, the first torque percentage is less than the second torque percentage, and the second torque percentage is less than the third torque percentage.

[0134] The third torque percentage can be selected and set according to the heating requirements of the lubricating oil using the motor pulse self-heating technology. This embodiment does not impose any special limitations on the specific value of the third torque percentage. Optionally, the third torque percentage can be 60%, and the third speed threshold can be 1100 rpm.

[0135] For example, with the third temperature setting at 0°C, the third torque percentage at 60%, and the third speed threshold at 1100 rpm, when the target oil temperature is below 0°C, the drive motor torque is limited to 60%, and the electronic oil pump operates at 1100 rpm. It should also be noted that at this time, the torque increases by 2% for every 1 degree Celsius increase in oil temperature.

[0136] Based on the same inventive concept, and on the basis described above, Figure 4 This is a schematic diagram of the structure of an electric drive bridge lubrication protection device provided in an embodiment of the present invention. Figure 4 As shown, the electric drive bridge lubrication protection device includes:

[0137] The lubrication circuit circulation module 410 is used to obtain the current oil temperature of the electric drive axle lubricating oil, and when the current oil temperature is lower than the low temperature set value, control the vehicle to enter the low temperature lubrication protection mode, and control the drive motor and electronic oil pump to operate so that the lubrication circuit circulates.

[0138] The electric drive axle lubricating oil heating module 420 is used to obtain the current gear position of the vehicle during the circulation of lubricating oil, and when the current gear position is neutral, determine the high-frequency pulse current based on the current oil temperature, so as to heat the electric drive axle lubricating oil through the high-frequency pulse current.

[0139] The electric drive axle lubrication protection module 430 is used to adjust the operating status of the drive motor and the electronic oil pump according to the target oil temperature of the electric drive axle lubricating oil after heating.

[0140] Optionally, the initial oil temperature of the electric drive axle lubricating oil can be obtained, specifically for:

[0141] When the oil temperature sensor is found to be fault-free, the initial oil temperature of the electric drive axle lubricating oil is collected using the oil temperature sensor; or,

[0142] When a fault is detected in the oil temperature sensor, the initial oil temperature of the electric drive axle lubricating oil is estimated based on the initial oil pressure of the electric drive axle lubricating oil using the oil temperature-oil pressure calibration table.

[0143] Optionally, the electric drive bridge lubrication protection device also includes:

[0144] The gear re-judgment module is used to determine the target oil temperature of the electric drive axle lubricating oil after heating if the gear is still in neutral at the current moment and the current oil temperature increases by a set temperature threshold.

[0145] If the gear is still in neutral at the current moment and the current oil temperature has not increased to the set temperature threshold, the electric drive axle lubricating oil will continue to be heated by high-frequency pulse current.

[0146] Optionally, the operating status of the drive motor and electronic oil pump can be adjusted according to the target oil temperature of the electric drive axle lubricating oil after heating, specifically for:

[0147] If the target oil temperature is lower than the first temperature setting value, the drive motor is controlled to change within the first speed range, and the electronic oil pump operates at the first speed threshold.

[0148] If the target oil temperature is greater than or equal to the first temperature setting value and less than the second temperature setting value, the drive motor is controlled to change within the second speed range, and the electronic oil pump operates at the second speed threshold.

[0149] If the target oil temperature is greater than or equal to the second temperature setting value and less than the third temperature setting value, the drive motor is controlled to change within the third speed range, and the electronic oil pump operates at the third speed threshold.

[0150] The first temperature setting is less than the second temperature setting, and the second temperature setting is less than the third temperature setting.

[0151] Optionally, the electric drive bridge lubrication protection device also includes:

[0152] The idle protection module is used to obtain the rate of change of the drive motor speed when the gear is in gear at the current moment;

[0153] If the rate of change of engine speed is greater than the set rate of change, the vehicle will be controlled to enter the idling protection mode until the rate of change of engine speed is less than or equal to the set rate of change, at which point the vehicle will be controlled to exit the idling protection mode.

[0154] Optionally, the electric drive bridge lubrication protection device also includes:

[0155] The gear control module is used to ensure that the gear is in gear at the current moment and the rate of change of speed is less than or equal to the set rate of change.

[0156] If the initial oil temperature is lower than the first temperature setting value, the drive motor torque is limited to the first torque percentage, and the electronic oil pump operates at the first speed threshold.

[0157] If the initial oil temperature is greater than or equal to the first temperature setting value and the target oil temperature is less than the second temperature setting value, the drive motor torque is limited to the second torque percentage, and the electronic oil pump operates at the second speed threshold.

[0158] If the initial oil temperature is greater than or equal to the second temperature setting value and the target oil temperature is less than the third temperature setting value, the drive motor torque is limited to the third torque percentage, and the electronic oil pump operates at the third speed threshold.

[0159] Among them, the first torque percentage is less than the second torque percentage, and the second torque percentage is less than the third torque percentage.

[0160] Optionally, the electric drive bridge lubrication protection device also includes:

[0161] Other protection mode adjustment modules are used to control the vehicle to enter the normal lubrication protection mode when the current oil temperature or target oil temperature is not lower than the low temperature setting value and the current oil temperature or target oil temperature is lower than the normal temperature setting value.

[0162] If the current oil temperature or target oil temperature is not lower than the normal temperature setting value, and the current oil temperature or target oil temperature is lower than the high temperature setting value, then the vehicle will be controlled to enter the high temperature lubrication protection mode.

[0163] If the current oil temperature or target oil temperature is not lower than the high temperature setting, the vehicle will be stopped for inspection.

[0164] The electric drive bridge lubrication protection device provided in the embodiments of the present invention can execute the electric drive bridge lubrication protection method provided in any embodiment of the present invention, and has the corresponding functional modules and beneficial effects for executing the electric drive bridge lubrication protection method.

[0165] Based on the same inventive concept, and on the basis of the above, the present invention also provides a vehicle, the vehicle including an electric drive axle, the electric drive axle including a drive motor and an electronic oil pump, the drive motor driving the electronic oil pump to match the lubrication requirements of the electric drive axle; Figure 5 A schematic diagram of the structure of a vehicle 510 that can be used to implement an embodiment of the present invention is shown. For example... Figure 5 As shown, the vehicle 510 also includes at least one processor 511 and a memory, such as a read-only memory (ROM 512) or a random access memory (RAM 513), communicatively connected to the at least one processor 511. The memory stores computer programs executable by the at least one processor. The processor 511 can perform various appropriate actions and processes based on the computer program stored in the ROM 512 or loaded from storage unit 518 into the RAM 513. The RAM 513 can also store various programs and data required for the operation of the vehicle 510. The processor 511, ROM 512, and RAM 513 are interconnected via a bus 514. An I / O (input / output) interface 515 is also connected to the bus 514.

[0166] Multiple components in vehicle 510 are connected to I / O interface 515, including: input unit 516, such as keyboard, mouse, etc.; output unit 517, such as various types of displays, speakers, etc.; storage unit 518, such as disk, optical disk, etc.; and communication unit 519, such as network card, modem, wireless transceiver, etc. Communication unit 519 allows vehicle 510 to exchange information / data with other devices through computer networks such as the Internet and / or various telecommunications networks.

[0167] Processor 511 can be a variety of general-purpose and / or special-purpose processing components with processing and computing capabilities. Some examples of processor 511 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various special-purpose artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any suitable processor, controller, microcontroller, etc. Processor 511 performs the various methods and processes described above, such as the electric drive axle lubrication protection method.

[0168] In some embodiments, the electric drive axle lubrication protection method may be implemented as a computer program tangibly contained in a computer-readable storage medium, such as storage unit 518. In some embodiments, part or all of the computer program may be loaded into and / or installed on vehicle 510 via ROM 512 and / or communication unit 519. When the computer program is loaded into RAM 513 and executed by processor 511, one or more steps of the electric drive axle lubrication protection method described above may be performed. Alternatively, in other embodiments, processor 511 may be configured to perform the electric drive axle lubrication protection method by any other suitable means (e.g., by means of firmware).

[0169] Various embodiments of the systems and techniques described above herein can be implemented in digital electronic circuit systems, integrated circuit systems, field-programmable gate arrays (FPGAs), application-specific integrated circuits (ASICs), application-specific standard products (ASSPs), systems-on-a-chip (SoCs), payload-programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments may include implementations in one or more computer programs that can be executed and / or interpreted on a programmable system including at least one programmable processor, which may be a dedicated or general-purpose programmable processor, capable of receiving data and instructions from a storage system, at least one input device, and at least one output device, and transmitting data and instructions to the storage system, the at least one input device, and the at least one output device.

[0170] Computer programs used to implement the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when executed by the processor, the computer programs cause the functions / operations specified in the flowcharts and / or block diagrams to be performed. The computer programs may be executed entirely on a machine, partially on a machine, or as a standalone software package, partially on a machine and partially on a remote machine, or entirely on a remote machine or server.

[0171] In the context of this invention, a computer-readable storage medium can be a tangible medium that may contain or store a computer program for use by or in conjunction with an instruction execution system, apparatus, or device. A computer-readable storage medium may include, but is not limited to, electronic, magnetic, optical, electromagnetic, infrared, or semiconductor systems, apparatus, or devices, or any suitable combination thereof. Alternatively, a computer-readable storage medium may be a machine-readable signal medium. More specific examples of machine-readable storage media include electrical connections based on one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fibers, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof.

[0172] To provide interaction with the user, the systems and technologies described herein can be implemented in a vehicle having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user provides input to the vehicle. Other types of devices can also be used to provide interaction with the user; for example, feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including sound input, voice input, or tactile input).

[0173] The systems and technologies described herein can be implemented in computing systems that include backend components (e.g., as data servers), or computing systems that include middleware components (e.g., application servers), or computing systems that include frontend components (e.g., user computers with graphical user interfaces or web browsers through which users can interact with implementations of the systems and technologies described herein), or any combination of such backend, middleware, or frontend components. The components of the system can be interconnected via digital data communication of any form or medium (e.g., communication networks). Examples of communication networks include local area networks (LANs), wide area networks (WANs), blockchain networks, and the Internet.

[0174] A computing system can include clients and servers. Clients and servers are generally located far apart and typically interact through communication networks. The client-server relationship is created by computer programs running on the respective computers and having a client-server relationship with each other. The server can be a cloud server, also known as a cloud computing server or cloud host, which is a hosting product within the cloud computing service system to address the shortcomings of traditional physical hosts and VPS services, such as high management difficulty and weak business scalability.

[0175] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0176] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for lubricating and protecting an electric drive bridge, characterized in that, include: The current oil temperature of the electric drive axle lubricating oil is obtained, and when the current oil temperature is lower than the low temperature set value, the vehicle is controlled to enter the low temperature lubrication protection mode, and the drive motor and electronic oil pump are controlled to operate so that the lubricating oil circuit is circulated. The current gear position of the vehicle during the circulation of lubricating oil is obtained, and when the current gear position is neutral, a high-frequency pulse current is determined based on the current oil temperature to heat the electric drive axle lubricating oil through the high-frequency pulse current; Adjust the operating status of the drive motor and the electronic oil pump according to the target oil temperature of the electric drive axle lubricating oil after heating; The method further includes, after obtaining the current gear position of the vehicle during the circulation of lubricating oil, obtaining the speed change rate of the drive motor when the current gear position is in gear; if the speed change rate is greater than a set change rate, controlling the vehicle to enter the idling protection mode until the speed change rate is less than or equal to the set change rate, and controlling the vehicle to exit the idling protection mode. After obtaining the vehicle's current gear position during the lubrication oil circulation process, the method further includes: if the current gear position is in gear and the speed change rate is less than or equal to the set change rate; if the initial oil temperature is less than a first temperature setting value, then the drive motor torque is limited to a first torque percentage, and the electronic oil pump operates at a first speed threshold; if the initial oil temperature is greater than or equal to the first temperature setting value and the target oil temperature is less than a second temperature setting value, then the drive motor torque is limited to a second torque percentage, and the electronic oil pump operates at a second speed threshold; if the initial oil temperature is greater than or equal to the second temperature setting value and the target oil temperature is less than a third temperature setting value, then the drive motor torque is limited to a third torque percentage, and the electronic oil pump operates at a third speed threshold; wherein, the first torque percentage is less than the second torque percentage, and the second torque percentage is less than the third torque percentage.

2. The method for lubricating and protecting an electric drive bridge according to claim 1, characterized in that, Obtain the initial oil temperature of the electric drive axle lubricating oil, including: When the oil temperature sensor is found to be fault-free, the initial oil temperature of the electric drive axle lubricating oil is collected using the oil temperature sensor; or, When a malfunction of the oil temperature sensor is detected, the initial oil temperature of the electric drive axle lubricating oil is estimated based on the initial oil pressure of the electric drive axle lubricating oil using the oil temperature-oil pressure calibration table.

3. The method for lubricating and protecting an electric drive bridge according to claim 1, characterized in that, After heating the electric drive bridge lubricating oil with the high-frequency pulsed current, the process further includes: If the gear is still in neutral at the current moment, and the current oil temperature increases by a set temperature threshold, then the current oil temperature increases by the set temperature threshold as the target oil temperature of the electric drive axle lubricating oil after heating. If the gear is still in neutral at the current moment and the current oil temperature has not increased beyond the set temperature threshold, then the electric drive axle lubricating oil will continue to be heated by the high-frequency pulse current.

4. The method for lubricating and protecting an electric drive bridge according to claim 1, characterized in that, Adjusting the operating status of the drive motor and the electronic oil pump according to the target oil temperature of the electric drive axle lubricating oil after heating includes: If the target oil temperature is less than the first temperature setting value, the drive motor is controlled to change within the first speed range, and the electronic oil pump operates at the first speed threshold. If the target oil temperature is greater than or equal to the first temperature setting value and the target oil temperature is less than the second temperature setting value, then the drive motor is controlled to change within the second speed range, and the electronic oil pump operates at the second speed threshold. If the target oil temperature is greater than or equal to the second temperature setting value and the target oil temperature is less than the third temperature setting value, then the drive motor is controlled to change within the third speed range, and the electronic oil pump operates at the third speed threshold. Wherein, the first temperature setting value is less than the second temperature setting value, and the second temperature setting value is less than the third temperature setting value.

5. The method for lubricating and protecting an electric drive bridge according to claim 1, characterized in that, The electric drive bridge lubrication protection method also includes: If the current oil temperature or the target oil temperature is not lower than the low temperature setting value, and the current oil temperature or the target oil temperature is lower than the normal temperature setting value, then the vehicle is controlled to enter the normal lubrication protection mode. If the current oil temperature or the target oil temperature is not lower than the normal temperature setting value, and the current oil temperature or the target oil temperature is lower than the high temperature setting value, then the vehicle is controlled to enter the high temperature lubrication protection mode. If the current oil temperature or the target oil temperature is not lower than the high temperature setting value, the vehicle is controlled to stop for inspection.

6. A lubrication protection device for an electric drive bridge, characterized in that, include: The lubrication oil circulation module is used to obtain the current oil temperature of the electric drive axle lubricating oil, and when the current oil temperature is lower than the low temperature set value, control the vehicle to enter the low temperature lubrication protection mode, and control the drive motor and electronic oil pump to operate so that the lubrication oil circulation is achieved. The electric drive axle lubricating oil heating module is used to obtain the current gear position of the vehicle during the circulation of lubricating oil, and when the current gear position is neutral, determine a high-frequency pulse current based on the current oil temperature, so as to heat the electric drive axle lubricating oil through the high-frequency pulse current. The electric drive axle lubrication protection module is used to adjust the operating status of the drive motor and the electronic oil pump according to the target oil temperature of the electric drive axle lubricating oil after heating. The idle protection module is used to obtain the speed change rate of the drive motor when the gear is in the active gear at the current moment; if the speed change rate is greater than the set change rate, the vehicle is controlled to enter the idle protection mode until the speed change rate is less than or equal to the set change rate, and then the vehicle is controlled to exit the idle protection mode. The gear control module is used to ensure that the gear is in gear at the current moment and the rate of change of speed is less than or equal to the set rate of change. If the initial oil temperature is less than the first temperature setting, the drive motor torque is limited to a first torque percentage, and the electronic oil pump operates at a first speed threshold. If the initial oil temperature is greater than or equal to the first temperature setting, and the target oil temperature is less than the second temperature setting, the drive motor torque is limited to a second torque percentage, and the electronic oil pump operates at a second speed threshold. If the initial oil temperature is greater than or equal to the second temperature setting, and the target oil temperature is less than the third temperature setting, the drive motor torque is limited to a third torque percentage, and the electronic oil pump operates at a third speed threshold. Wherein, the first torque percentage is less than the second torque percentage, and the second torque percentage is less than the third torque percentage.

7. A vehicle, characterized in that, The vehicle includes an electric drive axle, which includes a drive motor and an electronic oil pump. The drive motor drives the electronic oil pump to match the lubrication requirements of the electric drive axle. The vehicle also includes: At least one processor; and, A memory communicatively connected to the at least one processor; wherein, The memory stores a computer program that can be executed by the at least one processor, the computer program being executed by the at least one processor to enable the at least one processor to perform the electric drive axle lubrication protection method according to any one of claims 1-5.

8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions that, when executed by a processor, implement the electric drive bridge lubrication protection method according to any one of claims 1-5.

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