On-line self-cleaning system for cooling oil of oil-cooled electric drive assembly and control method of on-line self-cleaning system

Abstract

The invention discloses an oil cooling electric drive assembly cooling oil online self-cleaning system and a control method thereof, and relates to the technical field of cooling oil cleaning, an oil cooling electric drive assembly shell is provided with a cooling oil inlet and a cooling oil outlet, the oil cooling electric drive assembly shell comprises an oil tank and an oil supply pump, and an oil inlet of the oil supply pump is connected with the oil tank; an oil outlet of the oil supply pump is connected with an oil inlet of the proportional reversing valve through a pipeline I; an oil outlet I of the proportional reversing valve is connected with a cooling oil inlet; the cooling oil outlet is connected with the oil tank oil return port; the cooling oil pollution detection assembly is connected with the pipeline I so as to detect the pollution degree of the cooling oil; an oil outlet II of the proportional reversing valve is connected with an oil inlet of the cooling oil cleaning assembly; an oil outlet of the cooling oil cleaning assembly is connected with an oil tank oil return opening. And the self-cleaning controller is electrically connected with the oil supply pump, the proportional reversing valve and the cooling oil pollution detection assembly. The cooling oil on-line self-cleaning system can continuously keep the cleanliness of oil liquid in the running and stopping states.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of cooling oil cleaning, in particular to an online self-cleaning system for cooling oil of an oil-cooled electric drive assembly and a control method thereof. BACKGROUND

[0002] With the rapid development of new energy vehicles and electric equipment, oil-cooled electric drive assemblies are widely used due to their advantages of efficient heat dissipation, compact structure and high reliability. The existing systems generally use non-homologous oil cooling structures, and the motor, reducer and other components use independent or semi-independent oil circuits for cooling, resulting in a large number of oil circuits, complex structure, high cost, and difficulty in unified control of multi-path oil temperature and flow, and limited overall heat dissipation capacity. Under the conditions of high power density and high integration arrangement, local overheating, efficiency decline and maintenance difficulties are more likely to occur. At the same time, the traditional oil cooling system usually uses fixed filter elements to capture pollutants, and lacks real-time monitoring of key parameters such as oil pollution degree, pressure and flow. The filter element is difficult to find out in time when it is blocked, which may cause system flow to decrease and heat dissipation performance to decline. Under high temperature, high load and frequent start-stop conditions, the generation rate of oil pollutants increases significantly, and the existing filtering structure cannot automatically adjust the cleaning intensity according to the pollution degree, which may cause excessive filtration or insufficient filtration.

[0003] The existing oil cooling system relies on manual cleaning or replacement of filter elements after the vehicle is parked when the pollution is serious, which is low in maintenance efficiency and affects the use of the vehicle. Although the bypass filtration system can delay the accumulation of pollution to some extent, it still cannot realize online monitoring of pollution, intelligent switching of flow path and self-adaptive adjustment of cleaning intensity, lacks online self-cleaning capability in running and parking states, and is difficult to meet the requirements of modern electric drive assemblies for long-term operation, high reliability and low maintenance. In order to meet the requirements of high integration and high power density of the new generation of electric drive systems, the use of homologous oil cooling scheme has become a necessary technical direction to realize efficient heat dissipation and simplify the oil circuit structure.

[0004] Therefore, how to provide an online self-cleaning system for cooling oil of an oil-cooled electric drive assembly and a control method thereof, which can realize unified cooling and lubrication of the motor and the reducer through a single oil circuit, reduce the system complexity and manufacturing cost, and organically combine online monitoring of oil pollution degree, automatic flow path switching and self-adaptive cleaning strategy, so that the system can continuously maintain the cleanliness of the oil in running and parking states, thereby improving the overall heat dissipation performance, operation reliability and service life of key components, is a problem that needs to be solved by those skilled in the art. SUMMARY

[0005] Therefore, the present application provides an online self-cleaning system for cooling oil of an oil-cooled electric drive assembly and a control method thereof, which at least solves one of the above technical problems.

[0006] To achieve the above object, the present application adopts the following technical solutions: The present application provides an online self-cleaning system for cooling oil of an oil-cooled electric drive assembly. The oil tank and the oil supply pump, wherein the oil inlet of the oil supply pump is connected to the oil tank to suck the cooling oil; The proportional directional valve, wherein the oil outlet of the oil supply pump is connected to the oil inlet of the proportional directional valve through pipeline I to supply oil; the oil outlet of the proportional directional valve is connected to the cooling oil inlet through pipeline II to distribute the cooling oil; and the cooling oil outlet is connected to the oil return port of the oil tank through the oil return pipeline to return the cooling oil; The cooling oil pollution detection assembly, which is connected to the pipeline I to detect the pollution degree of the cooling oil transported thereby; The cooling oil cleaning assembly, wherein the oil outlet II of the proportional directional valve is connected to the oil inlet of the cooling oil cleaning assembly through pipeline III to distribute the cooling oil to be purified; and the oil outlet of the cooling oil cleaning assembly is connected to the oil return port of the oil tank to transport the purified cooling oil; The self-cleaning controller, which is electrically connected to the oil supply pump, the proportional directional valve and the cooling oil pollution detection assembly to receive the pollution degree data of the cooling oil fed back by the cooling oil pollution detection assembly and to control the working states of the oil supply pump and the proportional directional valve.

[0007] In use, the self-cleaning controller is used to control the oil supply pump to start to suck the cooling oil from the oil tank, and then the cooling oil is transported to the casing of the oil-cooled electric drive assembly through pipeline I, the proportional directional valve and pipeline II to cool and lubricate the motor and the speed reducer. Under the control of the self-cleaning controller, the proportional directional valve can distribute the oil transported by pipeline I to pipeline II and pipeline III according to a certain proportion, so that the cooling and cleaning of the cooling oil can be performed simultaneously. The cooling oil distributed to the casing of the oil-cooled electric drive assembly is returned to the oil tank through the cooling oil outlet and the oil return pipeline on the casing, and the cooling oil distributed to the cooling oil cleaning assembly is returned to the oil tank after being purified. The self-cleaning controller can control the distribution proportion of the proportional directional valve according to the pollution degree of the cooling oil transported by pipeline I detected by the cooling oil pollution detection assembly, so as to reasonably distribute the cooling oil and the cleaning oil, to improve the cleanliness of the system, to adaptively match the cleaning intensity and the pollution degree, to improve the cleaning efficiency and to avoid excessive cleaning to increase the energy consumption, and to improve the operation reliability of the whole machine.

[0008] As a further improvement of the above technical solutions, the system further comprises a flow control valve installed on the pipeline II to control the flow of the cooling oil.

[0009] The beneficial effects of the above technical solution are that the flow control valve can control the amount of cooling oil delivered to the oil-cooled electric drive assembly according to the signal transmitted by the self-cleaning controller, ensuring cooling and lubrication effects.

[0010] As a further improvement of the above technical solution, it further comprises a pressure sensor one and a pressure sensor two; the pressure sensor one is installed on the pipeline one to detect the oil supply pressure; the pressure sensor two is installed on the pipeline two and corresponds to the proportional directional valve and the flow control valve to detect the oil supply pressure; the self-cleaning controller is electrically connected to the pressure sensor one and the pressure sensor two.

[0011] The beneficial effects of the above technical solution are that the self-cleaning controller adjusts the oil supply pressure of the oil pump according to the oil pressure signals of the pipeline one and the pipeline two fed back by the pressure sensor one and the pressure sensor two, to ensure the stability of the amount of cooling oil delivered to the oil-cooled electric drive assembly and the oil pressure.

[0012] As a further improvement of the above technical solution, it further comprises an overflow valve, the oil inlet of the overflow valve is connected to the pipeline one, and the oil outlet of the overflow valve is connected to the oil return port of the oil tank.

[0013] The beneficial effects of the above technical solution are that the overflow valve can automatically open when the oil pressure in the pipeline one or the pipeline two exceeds the set threshold value to return the excess high-pressure oil to the oil tank, preventing the oil pump and the downstream oil circuit from being overloaded.

[0014] As a further improvement of the above technical solution, it further comprises a flow divider; one end of the pipeline two is connected to the oil outlet one of the proportional directional valve, and the other end of the pipeline two is connected to the oil inlet of the flow divider; the oil outlet one of the flow divider is connected to the end cover oil way inlet of the motor of the oil-cooled electric drive assembly through a pipeline to supply cooling oil into the motor; the oil outlet two of the flow divider is connected to the oil injection way inlet of the reducer of the oil-cooled electric drive assembly through a pipeline to supply cooling oil into the reducer. The cooling oil in the motor and the reducer can flow into the oil pan of the oil-cooled electric drive assembly, and the cooling oil outlet is arranged on the oil pan.

[0015] The beneficial effects of the above technical solution are that the flow divider can directionally distribute the cooling oil, and according to the set flow demand, the cooling oil is delivered to the end cover oil way inlet of the motor and the oil injection way inlet of the reducer respectively, so that the stator and rotor of the motor and the planetary gear mechanism of the reducer can all obtain stable and matched cooling and lubrication oil supply, thereby ensuring the heat dissipation efficiency and transmission reliability of the oil-cooled electric drive assembly under different working conditions.

[0016] As a further improvement of the above technical solution, the cooling oil cleaning assembly comprises a cyclone flow divider, a magnetic particle trap, a precision filter and a sludge collection and sedimentation cavity. The oil outlet of the proportional reversing valve is connected to the oil inlet of the cyclone flow divider through pipeline three to distribute the cooling oil to be purified; the oil outlet of the cyclone flow divider is connected to the oil inlet of the magnetic particle trap, the oil outlet of the magnetic particle trap is connected to the oil inlet of the precision filter, the oil outlet of the precision filter is connected to the oil inlet of the sludge collection and sedimentation cavity, and the oil outlet of the sludge collection and sedimentation cavity is connected to the oil return port of the oil tank to transport the purified cooling oil.

[0017] The beneficial effects of the above technical solution are that the cyclone flow divider is used for primary centrifugal separation and pre-cleaning of the cooling oil to be cleaned, removing large particle impurities with high density, thereby reducing the load of the subsequent magnetic particle trap and precision filter. The magnetic particle trap is used for removing magnetic impurities in the cooling oil to achieve secondary cleaning, avoiding ferromagnetic particles from entering the precision filter to cause excessive load or blockage of the filter element. The precision filter is used for tertiary fine filtration and cleaning of the cooling oil to filter out residual small particle impurities in the cooling oil. The sludge collection and sedimentation cavity is used for collecting and settling the solid impurities, and can reduce the oil flow rate by expanding the flow cross section, so that the fine particles in the cooling oil are settled at the bottom of the cavity under the action of gravity, thereby realizing the final separation of the solid impurities and the oil.

[0018] As a further improvement of the above technical solution, the cooling oil cleaning assembly further comprises a differential pressure sensor and a weight sensor; the differential pressure sensor is installed on the precision filter to detect the oil pressure difference between the inlet and outlet of the precision filter; the weight sensor is installed on the sludge collection and sedimentation cavity to detect the weight change amount thereof; and the self-cleaning controller is electrically connected to the differential pressure sensor and the weight sensor.

[0019] The beneficial effects of the above technical solution are that the differential pressure sensor detects the oil pressure difference between the inlet and outlet of the precision filter to monitor the pressure change before and after the filter element in real time, thereby providing a basis for judging the degree of blockage of the filter element. The weight sensor detects the weight increase of the sludge collection and sedimentation cavity in real time, thereby providing a basis for judging the accumulation state of the impurities, and improving the stability and maintainability of the system.

[0020] Another aspect of the present application provides a control method of an oil cooling and electric drive assembly cooling oil online self-cleaning system, which uses the oil cooling and electric drive assembly cooling oil online self-cleaning system, and the control method comprises the following steps: The self-cleaning controller controls the working state of the oil supply pump to regulate the oil supply pressure; the cooling oil pollution detection assembly detects the pollution degree of the cooling oil transported in the pipeline I in real time and uploads the pollution degree detection result to the self-cleaning controller; the self-cleaning controller determines the cooling oil pollution level according to the relative relationship between the detected pollution degree and the preset pollution degree reference value, and then regulates the oil outlet ratio of the oil outlet one and the oil outlet two of the proportional directional valve according to the cooling oil pollution level determination result.

[0021] As a further improvement of the above technical solution, the self-cleaning controller can execute different online cooling oil self-cleaning working modes according to the cooling oil pollution level determination result; the working modes include normal cycle mode, low-intensity cleaning mode, high-intensity cleaning mode, alarm and protection mode; In the normal cycle mode, the self-cleaning controller controls the oil outlet one of the proportional directional valve to be opened, controls the oil outlet two of the proportional directional valve to be closed, and monitors the pollution degree of the cooling oil transported in the pipeline I in real time; In the low-intensity cleaning mode and when the oil-cooled electric drive assembly is in the running state, the self-cleaning controller controls the oil outlet amount of the oil outlet one of the proportional directional valve to be greater than the oil outlet amount of the oil outlet two of the proportional directional valve, and monitors the pollution degree of the cooling oil transported in the pipeline I in real time; in the low-intensity cleaning mode and when the oil-cooled electric drive assembly is in the shutdown state, the self-cleaning controller controls the oil outlet one of the proportional directional valve to be closed, controls the oil outlet two of the proportional directional valve to be opened, and monitors the pollution degree of the cooling oil transported in the pipeline I in real time; In the high-intensity cleaning mode and when the oil-cooled electric drive assembly is in the running state, the self-cleaning controller controls the oil outlet amount of the oil outlet one of the proportional directional valve to be less than the oil outlet amount of the oil outlet two of the proportional directional valve, and monitors the pollution degree of the cooling oil transported in the pipeline I in real time; in the high-intensity cleaning mode and when the oil-cooled electric drive assembly is in the shutdown state, the self-cleaning controller controls the oil outlet one of the proportional directional valve to be closed, controls the oil outlet two of the proportional directional valve to be opened, and monitors the pollution degree of the cooling oil transported in the pipeline I in real time; In the alarm and protection mode, the self-cleaning controller controls the oil outlet one of the proportional directional valve to be opened, controls the oil outlet two of the proportional directional valve to be closed, and alarms to prompt the maintenance of the cooling oil cleaning assembly.

[0022] As a further improvement of the above technical solution, the cooling oil pollution level is divided into pollution level one, pollution level two, pollution level three, pollution level four and pollution level five according to the ratio of the pollution degree of the cooling oil transported in the pipeline I to the preset pollution degree reference value a; When the contamination degree is greater than or equal to a*90%, it is determined that the contamination level is five, and the alarm and protection mode is entered; when a*70%<=contamination degree

[0023] Compared with the prior art, the oil cooling electric drive assembly cooling oil online self-cleaning system and the control method thereof have the following advantages and beneficial effects.

[0024] 1. The multi-dimensional monitoring system covering the oil pressure, impurity concentration, filter core blockage degree and collection amount is constructed by arranging the pressure sensor one, the pressure sensor two, the cooling oil contamination detection assembly, the differential pressure sensor and the weight sensor in the main oil circuit and the cleaning system, the contamination state of the cooling oil of the oil cooling electric drive assembly can be obtained in real time under the vehicle running and parking conditions, so that the online detection of the oil contamination degree which cannot be realized by the traditional system is realized, and the reliability and timeliness of the oil state judgment are improved.

[0025] 2. The proportional direction valve is dynamically controlled by the self-cleaning controller, the normal circulation mode, the low-intensity cleaning mode, the high-intensity cleaning mode or the alarm and protection mode can be automatically switched according to the real-time monitored oil contamination level, and the split ratio entering the cleaning branch is automatically adjusted under different modes, so that the adaptive matching of the cleaning intensity and the contamination degree is realized, the cleaning efficiency is improved, and the increase of energy consumption caused by excessive cleaning is avoided.

[0026] 3. Under the vehicle running state, the safe flow of the main oil circuit can be maintained by adjusting the rotation speed of the oil supply pump, and the online cleaning is simultaneously executed; under the parking state, the system can close the main oil circuit, the oil is independently circulated in the cleaning branch by the low-speed driving of the oil supply pump, and deep cleaning is realized, the limitation that the existing technology cannot execute cleaning under the parking condition is expanded, and the working continuity and cleaning effect of the system are further improved.

[0027] 4. The multi-stage impurity removal mechanism is formed by the cyclone flow divider, the magnetic particle trap, the precision filter and the collection and sedimentation cavity of the cleaning branch, a plurality of types of pollutants can be effectively removed, most of the impurities are automatically processed inside the system, and manual maintenance is only prompted when the differential pressure of the filter core exceeds the set threshold or the collection cavity is full, so that the maintenance frequency is significantly reduced, and the service life of the cooling oil and the key components of the electric drive assembly is improved. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the accompanying drawings needed to be used in the embodiments or prior art description will be briefly introduced as follows. Obviously, the accompanying drawings in the following description only only the embodiments of the present application, and for those skilled in the art, other drawings can also be obtained without creative labor on the basis of the provided drawings.

[0029] Figure 1 The principle block diagram of the online self-cleaning system of the cooling oil of the oil-cooled electric drive assembly.

[0030] Figure 2 The heat dissipation oil circuit communication structure schematic diagram of the online self-cleaning system of the cooling oil of the oil-cooled electric drive assembly.

[0031] Figure 3 The self-cleaning oil circuit communication structure schematic diagram of the online self-cleaning system of the cooling oil of the oil-cooled electric drive assembly.

[0032] Figure 4 The partial communication structure schematic diagram of the heat dissipation oil circuit and the self-cleaning oil circuit of the online self-cleaning system of the cooling oil of the oil-cooled electric drive assembly.

[0033] Figure 5 The impurity monitoring sensor pollution level judgment flow chart of the online self-cleaning system of the cooling oil of the oil-cooled electric drive assembly.

[0034] Figure 6 The low-intensity cleaning mode flow chart of the online self-cleaning system of the cooling oil of the oil-cooled electric drive assembly.

[0035] Figure 7 The high-intensity cleaning mode flow chart of the online self-cleaning system of the cooling oil of the oil-cooled electric drive assembly.

[0036] Figure 8 The alarm and protection mode flow chart of the online self-cleaning system of the cooling oil of the oil-cooled electric drive assembly.

[0037] In the figure: 1, oil tank; 101, oil return line; 2, oil supply pump; 21, line one; 211, bypass oil pipe; 22, oil pump controller; 3, proportional directional valve; 31, line two; 32, line three; 4, cooling oil pollution detection assembly; 5, cooling oil cleaning assembly; 51, cyclone flow divider; 52, magnetic particle trap; 53, precision filter; 54, pollution collection settling chamber; 55, differential pressure sensor; 56, weight sensor; 6, self-cleaning controller; 7, flow control valve; 8, pressure sensor one; 9, pressure sensor two; 10, overflow valve; 11, flow dividing valve; 12, oil sump; 13, cooler; 14, motor; 141, stator; 142, rotor; 15, speed reducer; 151, planetary gear mechanism; 16, CAN bus; 17, machine housing. DETAILED DESCRIPTION

[0038] Embodiments of the present application are described in detail below with reference to the attached drawing figures, wherein the same or like reference numerals and characters throughout the figures denote the same or like elements or features. The embodiments described below are exemplary and are intended to be illustrative of the present application and are not to be construed as limiting the present application.

[0039] In the description of the present application, it is to be understood that the orientations or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like are based on the orientations or positional relationships shown in the drawings, and are merely intended to facilitate the description of the present application and simplify the description, and are not intended to indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be construed as limiting the present application.

[0040] In addition, the terms "first", "second", "third", etc. are used only for descriptive purposes and are not to be construed as indicating or implying relative importance or an indicated number of technical features. Therefore, features defined with "first", "second", etc. can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise explicitly specified and limited.

[0041] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or integral; can be mechanical connection, can also be electrical connection; can be directly connected, can also be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0042] According to the embodiment of the present application, as shown in Figures 1 to 8 An online self-cleaning system for cooling oil of an oil-cooled electric drive assembly, the oil-cooled electric drive assembly having a cooling oil inlet and a cooling oil outlet on a casing 17 of the oil-cooled electric drive assembly, comprising: an oil tank 1, a feed pump 2, a proportional directional valve 3, a cooling oil pollution detection assembly 4, and a cooling oil cleaning assembly 5.

[0043] The feed pump 2 is connected to the oil tank 1 through an inlet to suck the cooling oil.

[0044] The outlet of the feed pump 2 is connected to the proportional directional valve 3 through a pipeline 1 21 to supply the cooling oil; the outlet of the proportional directional valve 3 is connected to the cooling oil inlet through a pipeline 2 31 to distribute the cooling oil; and the cooling oil outlet is connected to the oil tank 1 through a return pipeline 101 to return the cooling oil.

[0045] The cooling oil pollution detection assembly 4 is connected to the pipeline 1 21 to detect the pollution degree of the cooling oil delivered by the pipeline 1 21.

[0046] The outlet 2 of the proportional directional valve 3 is connected to the inlet of the cooling oil cleaning assembly 5 through a pipeline 3 32 to distribute the cooling oil to be cleaned; and the outlet of the cooling oil cleaning assembly 5 is connected to the return inlet of the oil tank 1 to deliver the cleaned cooling oil.

[0047] A self-cleaning controller 6 is electrically connected to the feed pump 2, the proportional directional valve 3, and the cooling oil pollution detection assembly 4 to receive the pollution degree data of the cooling oil fed back by the cooling oil pollution detection assembly 4, and to control the working states of the feed pump 2 and the proportional directional valve 3.

[0048] In use, the online self-cleaning system for cooling oil of the oil-cooled electric drive assembly according to the embodiment of the present application first controls the feed pump 2 to start to suck the cooling oil from the oil tank 1, and then delivers the cooling oil to the casing 17 of the oil-cooled electric drive assembly through the pipeline 1 21, the proportional directional valve 3, and the pipeline 2 31 to cool and lubricate the motor and the reducer. Under the control of the self-cleaning controller 6, the proportional directional valve 3 can distribute the oil delivered by the pipeline 1 21 to the pipeline 2 31 and the pipeline 3 32 according to a proportion, and thus can realize the simultaneous cooling and cleaning of the cooling oil. The cooling oil branched to the casing 17 of the oil-cooled electric drive assembly returns to the oil tank 1 through the cooling oil outlet on the casing 17 and the return pipeline 101, and the cooling oil branched to the cooling oil cleaning assembly 5 returns to the oil tank 1 after being cleaned. The self-cleaning controller 6 can control the distribution proportion of the proportional directional valve 3 according to the pollution degree of the cooling oil delivered by the pipeline 1 21 detected by the cooling oil pollution detection assembly 4, and thus can reasonably distribute the cooling oil and the cleaning oil, so as to realize the adaptive matching of the cleaning intensity and the pollution degree while ensuring the cleanliness of the system oil to be improved, to improve the cleaning efficiency and avoid the increase of energy consumption caused by excessive cleaning, and to improve the operation reliability of the whole machine.

[0049] Specifically, the oil supply pump 2 is an electronic oil pump. The oil pump controller 22 is electrically connected to the self-cleaning controller 6 and electrically connected to the oil supply pump 2. The oil pump controller 22 is used to receive the target pressure, flow and working mode instructions issued by the self-cleaning controller 6, and output a speed regulating signal to the oil supply pump 2 to adjust the rotation speed and oil supply of the oil supply pump 2 in real time, so as to ensure that the main oil circuit maintains safe and stable oil supply in each mode.

[0050] In some embodiments, a flow control valve 7 is further included, which is installed on the pipeline two 31 to control the cooling oil supply flow.

[0051] The flow control valve 7 can control the amount of cooling oil delivered to the oil-cooled electric drive assembly according to the signal transmitted by the self-cleaning controller 6, and ensure the cooling and lubrication effect.

[0052] In some embodiments, a pressure sensor one 8 and a pressure sensor two 9 are further included. The pressure sensor one 8 is installed on the pipeline one 21 to detect the oil supply pressure. The pressure sensor two 9 is installed on the pipeline two 31 and corresponds to the proportional directional valve 3 and the flow control valve 7 to detect the oil supply pressure. The self-cleaning controller 6 is electrically connected to the pressure sensor one 8 and the pressure sensor two 9.

[0053] Specifically, the pressure measuring port of the pressure sensor one 8 is mechanically connected and communicated with the pressure measuring through hole on the outer peripheral wall of the pipeline one 21. The pressure measuring port of the pressure sensor two 9 is mechanically connected and communicated with the pressure measuring through hole on the outer peripheral wall of the pipeline two 31. The detection port of the impurity monitoring sensor is mechanically connected and communicated with the sampling through hole on the outer peripheral wall of the pipeline one 21.

[0054] The self-cleaning controller 6 regulates the oil supply pressure of the oil supply pump 2 according to the oil pressure signals of the pipeline one 21 fed back by the pressure sensor one 8 and the oil pressure signals of the pipeline two 31 fed back by the pressure sensor two 9, so as to ensure the stability of the amount of cooling oil delivered to the oil-cooled electric drive assembly and the oil pressure.

[0055] Specifically, the pressure sensor one 8 is used to detect the oil pressure at the oil outlet of the oil supply pump 2 in real time, and upload the pressure data to the self-cleaning controller 6, so that the self-cleaning controller 6 adjusts the rotation speed of the oil supply pump 2 according to the pressure change, thereby ensuring that the main oil circuit maintains stable and safe working pressure in each working mode. The pressure sensor two 9 is used to detect the oil pressure at the oil outlet one of the proportional directional valve 3 in real time, and upload the pressure data to the self-cleaning controller 6, so that the self-cleaning controller 6 adjusts the rotation speed of the oil supply pump 2 according to the pressure change, thereby ensuring that the main oil circuit maintains stable and safe working pressure in each working mode.

[0056] In some embodiments, the overflow valve 10 is further included, the oil inlet of the overflow valve 10 is connected with the pipeline I 21, and the oil outlet of the overflow valve 10 is connected with the oil return port of the oil tank 1.

[0057] The overflow valve 10 can be automatically opened when the oil pressure in the pipeline I 21 or the pipeline II 31 exceeds the set threshold value to return the excess high-pressure oil to the oil tank, so as to prevent the oil supply pump 2 and the downstream oil circuit from being overloaded.

[0058] Specifically, the pipeline I 21 is connected with the bypass oil pipe 211; one end of the bypass oil pipe 211 is connected with and communicates with the pipeline I 21, and the other end is connected with and communicates with the oil return port of the oil tank 1; the overflow valve 10 is installed on the bypass oil pipe 211 and is used for being automatically opened when the system oil pressure exceeds the set threshold value to return the excess high-pressure oil to the oil tank 1 through the bypass oil pipe 211, so as to limit the maximum pressure of the oil circuit and prevent the oil supply pump 2 and the downstream oil circuit from being overloaded; the overflow valve 10 is automatically closed after the oil pressure returns to the normal range, so that the oil reenters the normal circulation, thereby ensuring that the entire cooling and lubricating system maintains a safe and stable pressure level under various working conditions.

[0059] In some embodiments, the overflow valve 10 is further included, the oil inlet of the overflow valve 10 is connected with the pipeline I 21, and the oil outlet of the overflow valve 10 is connected with the oil return port of the oil tank 1. The cooling oil in the motor and the reducer can be converged to the oil pan 12 of the oil-cooled electric drive assembly, and the cooling oil outlet is arranged on the oil pan 12.

[0060] Specifically, the oil-cooled electric drive assembly is provided with the circulating oil channel, the end cover oil channel, the oil injection channel and the oil pan 12 in the machine shell 17, the circulating oil channel and the end cover oil channel are communicated, and the oil outlet of the circulating oil channel and the oil outlet of the oil injection channel are communicated with the oil pan 12. After the cooling oil enters the end cover oil channel, the cooling oil is divided into two paths, one path enters the circulating oil channel, is sprayed through the oil injection hole, cools the stator by cooling the outer surface of the end portion winding and flowing along the oil channel, and the remaining oil returns to the oil pan 12 from the outlet of the circulating oil channel, and the other path enters the end cover oil channel, internally cools the rotating shaft and the rotor, and sprays the end portion winding inner surface through the oil throwing hole. After the cooling oil enters the oil injection channel, the cooling oil is sprayed to the sun gear, the planet gears, the ring gear and the output shaft bearing through the plurality of oil injection branches and the oil injection holes, so as to comprehensively lubricate and cool the planetary gear set; and the sprayed and thrown oil finally converges into the oil pan 12, is cooled again and then returns to the oil tank, so as to complete the cooling and lubricating cycle.

[0061] The flow distribution valve 11 can distribute the cooling oil in different directions, and deliver the cooling oil to the oil inlet of the end cover oil channel of the motor and the oil inlet of the oil injection channel of the reducer according to the set flow requirement, so that the stator and rotor of the motor and the planetary gear mechanism of the reducer can obtain stable and matched cooling and lubrication oil supply, thereby ensuring the heat dissipation efficiency and transmission reliability of the oil-cooled electric drive assembly under different working conditions.

[0062] Specifically, the flow control valve 7 is used to accurately adjust the oil flow entering the flow distribution valve 11 in the main oil circuit. By adjusting the opening of the valve core of the flow control valve 7, the flow in the main oil circuit is stabilized within a set range, so that the cooling oil channel of the motor and the oil injection channel of the reducer can obtain constant and reliable oil supply under different working conditions, avoiding insufficient cooling and lubrication due to load changes, flow distribution ratio adjustment or oil pump speed changes, and providing stable upstream flow conditions for subsequent flow distribution control.

[0063] Specifically, the flow distribution valve 11 is used to distribute the cooling oil in the main oil circuit downstream of the flow control valve 7 in different directions, and deliver the oil to the oil inlet of the end cover oil channel of the motor and the oil inlet of the oil injection channel of the reducer according to the set flow requirement, so that the stator 141 and rotor 142 of the motor 14 and the planetary gear mechanism 151 of the reducer 15 can obtain stable and matched cooling and lubrication oil supply, thereby ensuring the heat dissipation efficiency and transmission reliability of the electric drive assembly under different working conditions.

[0064] Specifically, the oil sump 12 is used to collect high-temperature cooling oil returned from the circulating oil channel in the motor 14 and the oil injection channel in the reducer 15, and serves as a temporary oil storage cavity of the system. The returned oil forms a stable oil reservoir at the bottom of the oil tank by gravity settling, so that the oil tank 1 has a continuous and stable oil supply source. At the same time, the oil sump 12 can naturally settle some large particles in the returned oil, reducing the risk of impurities entering the upstream oil supply pump 2 and the oil circuit, thereby improving the reliability of the entire cooling and lubrication system.

[0065] In some embodiments, a cooler 13 is installed on the oil return pipeline 101.

[0066] The cooler 13 is used to exchange heat and cool the high-temperature cooling oil discharged from the outlet of the oil sump 12. By exchanging heat with external cooling medium, the oil temperature is restored to an appropriate working range, so that the cooling oil has sufficient cooling capacity before entering the circulating oil channel in the motor 14 and the oil injection channel in the reducer 15, avoiding the decrease of electric drive assembly efficiency, the degradation of insulation performance and the failure of lubrication due to high oil temperature, and improving the thermal stability and reliability of the system under different working conditions.

[0067] In some embodiments, the cooling oil cleaning assembly 5 includes a cyclone flow distributor 51, a magnetic particle trap 52, a precision filter 53 and a sludge settling cavity 54. The oil outlet two of the proportional directional valve 3 is connected to the oil inlet of the cyclone flow divider 51 through the pipeline three 32 to distribute the cooling oil to be purified; the oil outlet of the cyclone flow divider 51 is connected to the oil inlet of the magnetic particle trap 52, the oil outlet of the magnetic particle trap 52 is connected to the oil inlet of the precision filter 53, the oil outlet of the precision filter 53 is connected to the oil inlet of the dirt collection and sedimentation cavity 54, and the oil outlet of the dirt collection and sedimentation cavity 54 is connected to the oil return port of the oil tank 1 to transport the purified cooling oil.

[0068] The cyclone flow divider 51 is used for primary centrifugal separation and pre-cleaning of the cooling oil to be cleaned, and removes large particle impurities with high density, thereby reducing the load of the subsequent magnetic particle trap 52 and precision filter 53. The magnetic particle trap 52 is used for removing magnetic impurities in the cooling oil to achieve secondary cleaning, so as to avoid ferromagnetic particles from entering the precision filter 53 to cause excessive load or blockage of the filter element. The precision filter 53 is used for tertiary fine filtration and cleaning of the cooling oil, and filters out residual small particle impurities in the cooling oil. The dirt collection and sedimentation cavity 54 is used for collecting and sedimenting solid impurities, and can reduce the oil flow rate by expanding the flow cross section, so that fine particles in the cooling oil are sedimented to the bottom of the cavity under the action of gravity, thereby realizing the final separation of solid impurities and oil.

[0069] Specifically, the cyclone flow divider 51 is used for primary centrifugal separation of the cooling oil entering the cleaning branch, and generates a radial centrifugal force on the oil by forming a high-speed cyclone in the separation cavity, so that large particle impurities with high density are separated from the oil and thrown to the outer wall of the separation cavity, and then are sedimented to the lower collection area along the wall, thereby realizing rapid and low-resistance removal of large particle pollutants, and providing more stable and lower load pretreated oil for the subsequent depth filtration of the magnetic particle trap 52 and the precision filter 53.

[0070] Specifically, the magnetic particle trap 52 is used for secondary removal of magnetic impurities from the oil after cyclone separation, and generates a stable magnetic field by the permanent magnet or electromagnet arranged in the flow channel, so that the ferromagnetic particles in the oil which are not removed by the primary centrifugal separation are adsorbed and fixed in the magnetic field action area, thereby avoiding the ferromagnetic particles from entering the precision filter element to cause excessive load or blockage of the filter element, improving the stability and reliability of the subsequent filtration process, and further improving the overall cleanliness of the cooling oil.

[0071] Specifically, the precision filter 53 is used for tertiary fine filtration of the oil after cyclone separation and magnetic trapping, and traps residual small particle impurities in the oil by high-precision porous filter material, so as to ensure that the oil reaches high cleanliness before entering the subsequent flow path, thereby avoiding fine particles from entering the motor and the speed reducer to cause wear or blockage, improving the lubrication reliability and overall operation life of the system, and realizing staged filtration and centralized treatment.

[0072] Specifically, the dirt collection and sedimentation cavity 54 is used for collecting and sedimenting the fine particulate impurities remaining in the oil filtered by the precision filter 53 and the solid impurities in the system. By expanding the flow cross section and reducing the oil flow rate, the fine particles in the oil and the residues generated during the operation of the system are allowed to settle to the bottom of the cavity under the action of gravity, thereby realizing the final separation of the solid impurities and the oil. At the same time, the dirt collection and sedimentation cavity 54 can reduce the risk of impurities re-entering the oil circuit and facilitate the centralized cleaning of the sediments during the maintenance phase, thereby improving the maintainability and reliability of the cleaning system.

[0073] In some embodiments, the cooling oil cleaning assembly 5 further comprises a differential pressure sensor 55 and a weight sensor 56. The differential pressure sensor 55 is installed on the precision filter 53 to detect the oil pressure difference between the inlet and outlet of the precision filter 53. The weight sensor 56 is installed on the dirt collection and sedimentation cavity 54 to detect the weight change amount thereof. The self-cleaning controller 6 is electrically connected to the differential pressure sensor 55 and the weight sensor 56.

[0074] Specifically, the pressure measuring port of the differential pressure sensor 55 is mechanically connected and communicated with the pressure measuring through hole on the inlet and outlet oil pipe connected to the precision filter 53. The weight sensor 56 is mechanically connected to the bottom of the dirt collection and sedimentation cavity 54.

[0075] The differential pressure sensor 55 detects the oil pressure difference between the inlet and outlet sides of the precision filter 53 to monitor the pressure change before and after the filter element in real time, thereby providing a basis for judging the degree of blockage of the filter element. The weight sensor 56 detects the weight increase of the dirt collection and sedimentation cavity 54 in real time, thereby providing a basis for judging the impurity accumulation state, and further improving the stability and maintainability of the system.

[0076] Specifically, the differential pressure sensor 55 is used to detect the oil pressure difference between the inlet and outlet sides of the precision filter 53, to monitor the pressure change before and after the filter element of the precision filter 53 in real time, thereby judging the degree of blockage of the filter element, and uploading the differential pressure signal to the self-cleaning controller 6. The self-cleaning controller 6 determines whether the filter element needs to be prompted for manual maintenance according to whether the differential pressure exceeds the set threshold, thereby ensuring that the cleaning system continuously maintains effective filtering capacity and avoids the decrease of the main oil circuit flow rate or the insufficient cooling caused by the blockage of the filter element.

[0077] Specifically, the weight sensor 56 detects the weight increase of the deposited impurities at the bottom of the dirt collection and sedimentation cavity 54 in real time, judges the accumulation state of the impurities in the dirt collection and sedimentation cavity 54 by measuring the weight change of the deposits at the bottom of the cavity, and uploads the detection signal to the self-cleaning controller 6; the self-cleaning controller 6 determines whether the dirt collection and sedimentation cavity 54 is in a full load or a near full load state according to whether the weight change reaches a set cleaning threshold, realizes the monitoring and maintenance prompting of the deposition state of the impurities, thereby realizing the accurate prompting of the maintenance time, preventing the excessive accumulation of impurities in the dirt collection and sedimentation cavity 54 from affecting the cleaning efficiency or causing secondary pollution, and further improving the stability and maintainability of the system.

[0078] Specifically, the cooling oil pollution detection assembly 4 is an impurity monitoring sensor, which is used to detect the concentration level of particulate pollutants in the cooling oil in real time, and upload the detection result to the self-cleaning controller 6, so that the self-cleaning controller 6 can determine the current pollution level according to the change of the oil pollution degree and trigger the corresponding cleaning mode, to realize the automatic adjustment of the cleaning intensity of the cooling oil and the dynamic control of the oil circuit operating state. The self-cleaning controller 6 is used to collect the state parameters and signals of the pressure sensor one 8, the pressure sensor two 9, the cooling oil pollution detection assembly 4, the pressure difference sensor 55 and the weight sensor 56, and output control instructions to the oil supply pump 2, the proportional reversing valve 3, the flow control valve 7 and the oil pump controller 22 according to the built-in control strategy, to realize the pressure regulation of the cooling oil circuit, the shunt control of the cleaning branch and the automatic switching of the cleaning mode.

[0079] Specifically, the proportional reversing valve 3 is used to proportionally distribute the oil output by the oil supply pump 2 under the control of the self-cleaning controller 6, to realize the dynamic switching and flow regulation of the heat dissipation oil circuit and the self-cleaning oil circuit by adjusting the valve core opening of the proportional reversing valve 3 to shunt the oil between the main oil circuit and the cleaning branch according to the set proportion, so as to automatically select different working modes such as normal circulation, low-intensity cleaning, high-intensity cleaning or alarm protection according to the pollution level of the oil.

[0080] According to another embodiment of the present application, a control method of an online self-cleaning system of a cooling oil of an oil-cooled electric drive assembly, uses an online self-cleaning system of a cooling oil of an oil-cooled electric drive assembly, and the control method comprises the following steps: The self-cleaning controller 6 controls the working state of the oil supply pump 2 to regulate the oil supply pressure; the cooling oil pollution detection assembly 4 detects the pollution degree of the cooling oil conveyed in the pipeline one 21 in real time, and uploads the pollution degree detection result to the self-cleaning controller 6; the self-cleaning controller 6 determines the pollution level of the cooling oil according to the relative relationship between the detected pollution degree and the preset pollution degree reference value, and further regulates the oil output proportion of the oil outlet one and the oil outlet two of the proportional reversing valve 3 according to the pollution level determination result of the cooling oil.

[0081] In some embodiments, the self-cleaning controller 6 can execute different online self-cleaning modes of the cooling oil according to the cooling oil pollution level determination result; the working modes include normal cycle mode, low-intensity cleaning mode, high-intensity cleaning mode, alarm and protection mode.

[0082] In the normal cycle mode, the self-cleaning controller 6 controls the oil outlet one of the proportional reversing valve 3 to be opened, controls the oil outlet two of the proportional reversing valve 3 to be closed, and monitors the pollution degree of the cooling oil transported in the pipeline one 21 in real time; the pressure is maintained stable by the pressure sensor one 8 and the pressure sensor two 9.

[0083] In the low-intensity cleaning mode and when the oil-cooled electric drive assembly is in the running state, the self-cleaning controller 6 controls the oil outlet amount of the oil outlet one of the proportional reversing valve 3 to be greater than the oil outlet amount of the oil outlet two of the proportional reversing valve 3, and monitors the pollution degree of the cooling oil transported in the pipeline one 21 in real time; in the low-intensity cleaning mode and when the oil-cooled electric drive assembly is in the shutdown state, the self-cleaning controller 6 controls the oil outlet one of the proportional reversing valve 3 to be closed, controls the oil outlet two of the proportional reversing valve 3 to be opened, and monitors the pollution degree of the cooling oil transported in the pipeline one 21 in real time.

[0084] In the high-intensity cleaning mode and when the oil-cooled electric drive assembly is in the running state, the self-cleaning controller 6 controls the oil outlet amount of the oil outlet one of the proportional reversing valve 3 to be less than the oil outlet amount of the oil outlet two of the proportional reversing valve 3, and monitors the pollution degree of the cooling oil transported in the pipeline one 21 in real time; in the high-intensity cleaning mode and when the oil-cooled electric drive assembly is in the shutdown state, the self-cleaning controller 6 controls the oil outlet one of the proportional reversing valve 3 to be closed, controls the oil outlet two of the proportional reversing valve 3 to be opened, and monitors the pollution degree of the cooling oil transported in the pipeline one 21 in real time.

[0085] In the alarm and protection mode, the self-cleaning controller 6 controls the oil outlet one of the proportional reversing valve 3 to be opened, controls the oil outlet two of the proportional reversing valve 3 to be closed, and alarms to prompt the maintenance of the cooling oil cleaning assembly 5.

[0086] In some embodiments, the cooling oil pollution level is divided into pollution level one, pollution level two, pollution level three, pollution level four and pollution level five according to the ratio of the pollution degree of the cooling oil transported in the pipeline one 21 to the preset pollution degree reference value a.

[0087] When the pollution degree is greater than or equal to a × 90%, it is determined to be pollution level five and enters the alarm and protection mode; when a × 70% ≤ pollution degree < a × 90%, it is determined to be pollution level four and enters the high-intensity cleaning mode; when a × 40% ≤ pollution degree < a × 70%, it is determined to be pollution level three and enters the low-intensity cleaning mode; when a × 20% ≤ pollution degree < a × 40%, it is determined to be pollution level two, and when the pollution degree < a × 20%, it is determined to be pollution level one, and the normal cycle mode is maintained.

[0088] In some embodiments, the self-cleaning controller 6 is electrically connected to the oil pump controller 22, the cooling oil pollution detection assembly 4, the flow control valve 7, the pressure sensor one 8, the pressure sensor two 9, the differential pressure sensor 55 and the weight sensor 56 through the CAN bus 16 for signal transmission between the control units.

[0089] Specifically, the electronic oil pump is electrically connected to the oil pump controller 22; the oil pump controller 22, the impurity monitoring sensor, the flow control valve 7, the pressure sensor one 8, the pressure sensor two 9, the differential pressure sensor 55 and the weight sensor 56 are connected in parallel on the CAN bus 16, and the CAN bus 16 is electrically connected to the self-cleaning controller 6.

[0090] In some embodiments, the online self-cleaning system of the oil cooling electric drive assembly cooling oil of the present application can realize four working modes of normal circulation, low-intensity cleaning, high-intensity cleaning and alarm and protection in actual application according to the oil pollution state and the vehicle operating condition, by the self-cleaning controller 6 coordinating the control of the proportional directional valve 3, the oil supply pump 2 and the related monitoring components. The specific control process of each mode is further described below in combination with the working state.

[0091] Specifically, as shown in Figure 2 In the normal circulation mode, the system is in a working state of complete communication of the heat dissipation oil circuit, the self-cleaning controller 6 determines that the oil pollution degree is not higher than the pollution level two according to the pollution level collected by the impurity monitoring sensor, controls the proportional directional valve 3 to keep the main oil circuit full open (i.e. the pipeline one 21, the pipeline two 31 and the oil return pipeline 101 are in the conductive state), and the cleaning branch is closed (i.e. the pipeline three 32 is closed). The oil supply pump 2 continuously supplies oil according to the target speed adjusted by the oil pump controller 22, and the cooling oil enters the end cover oil way and the circulating oil way of the motor 14 and the oil injection way of the reducer 15 in sequence through the flow control valve 7 and the flow dividing valve 11, and performs regular cooling and lubrication on the stator, the rotor and the planetary gear set. The system detects the main oil circuit pressure in real time through the pressure sensor one 8 and the pressure sensor two 9 to maintain stable oil supply.

[0092] Specifically, the main oil circuit is the oil circuit where the pipeline one 21 and the pipeline two 31 are located; the cleaning branch is the oil circuit where the pipeline three 32 is located. As shown in Figure 4 and Figure 6As shown, in the low-intensity cleaning mode, the self-cleaning controller 6 determines that online cleaning is needed according to the pollution level being level three. When the vehicle is in operation, the system is in a working state in which the heat dissipation oil circuit and the self-cleaning oil circuit are partially connected, and the self-cleaning controller 6 adjusts the proportional directional valve 3 to make 30%-40% of the oil enter the cleaning branch. The pressure sensor 2 detects the pressure of the main oil circuit after the oil is branched and feeds back the pressure, and the self-cleaning controller 6 sends a speed adjustment instruction to the oil pump controller 22 to maintain the safe flow of the main circuit. The oil in the cleaning branch sequentially passes through the cyclone flow divider 51, the magnetic particle trap 52, the precision filter 53, and the pollution collection and sedimentation cavity 54, and returns to the oil tank 1 after multi-stage filtration. When the pollution level is reduced to not higher than level two, the system returns to the normal circulation mode; if the pollution level is not reduced to level two, the system is upgraded to the high-intensity cleaning mode. When the vehicle is in the running parking state, as shown, Figure 3 As shown, the system is in a working state in which the cleaning oil circuit is completely connected, the self-cleaning controller 6 controls the proportional directional valve 3 to close the main oil circuit and completely open the cleaning branch, and the oil pump controller 22 controls the oil pump 2 to run at a low speed, so that all the oil circulates in the cleaning branch for processing. The system monitors the cleaning effect according to the impurity monitoring sensor data, and if the pollution level is not higher than level two, the cleaning is ended and the system enters the standby state; if the pollution level is higher than level two, the manual inspection prompt is triggered.

[0093] Specifically, the heat dissipation oil circuit is a circuit formed by the pipeline 1 21, the pipeline 2 31, the end cover oil way and the circulating oil way of the motor 14, the oil injection way of the reducer 15, the oil sump 12, the oil return pipeline 101, and the oil tank 1 connected in sequence; and the self-cleaning oil circuit is a circuit formed by the pipeline 3 32, the cyclone flow divider 51, the magnetic particle trap 52, the precision filter 53, the pollution collection and sedimentation cavity 54, and the oil tank 1 connected in sequence. As shown, Figure 4 and Figure 7 As shown, in the high-intensity cleaning mode, the self-cleaning controller 6 determines that the oil is seriously polluted according to the pollution level being level four, and needs to be cleaned at a large flow rate. When the vehicle is in operation, the system is in a working state in which the heat dissipation oil circuit and the self-cleaning oil circuit are partially connected, and the proportional directional valve 3 is controlled to make 70%-100% of the flow of the main oil circuit enter the cleaning branch. The pressure sensor 2 feeds back the pressure of the main oil circuit in real time, and the self-cleaning controller 6 adjusts the speed of the electronic oil pump to ensure that the oil supply of the main oil circuit is not lower than the minimum safe flow. The self-cleaning oil circuit performs high-efficiency filtration of the whole process, and the change in the cleanliness of the oil is monitored in real time by the impurity monitoring sensor, and level three is used as a limit to determine whether the high-intensity cleaning can effectively purify the oil. As the oil is gradually purified, when the pollution level is reduced from level four to level three, it indicates that the oil is effectively cleaned, and the system is downgraded to the low-intensity cleaning mode (the working process of the low-intensity cleaning mode is described above with reference to Figure 6If the pollution level remains higher than pollution level three, the system switches to alarm and protection mode. When the vehicle is parked, if... Figure 3 As shown, the system is in a fully connected self-cleaning oil circuit operating state. The self-cleaning controller 6 controls the proportional directional valve 3 to close the main oil circuit and fully open the cleaning branch. At the same time, the oil supply pump 2 drives all the oil to circulate in the self-cleaning oil circuit at low speed, achieving deep cleaning during shutdown. Cleaning ends and the system enters standby mode when the contamination level is not higher than contamination level two; if it is still higher than contamination level two, manual maintenance is prompted.

[0094] Specifically, such as Figure 2 and Figure 8 As shown, in alarm and protection mode, when the impurity monitoring sensor detects a contamination level of five, the self-cleaning controller 6 immediately triggers an alarm and prompts the driver to stop for maintenance. Simultaneously, it controls the proportional directional valve 3 to close the cleaning branch and sends a command to the oil pump controller 22 to operate the oil supply pump 2 at low speed, maintaining a minimum oil supply in the main oil circuit to protect the electric drive assembly's basic cooling needs for a short period. After the vehicle enters maintenance mode, the filter element of the precision filter 53 is removed and replaced, and the sediment inside the collection and settling chamber 54 is cleaned or sludge is removed. After maintenance, the self-cleaning controller 6 drives the oil to circulate in the self-cleaning oil circuit while the vehicle remains stationary, using the impurity monitoring sensor to determine if the oil contamination level has returned to no higher than contamination level two. When the oil contamination level reaches the required level, it automatically exits the alarm mode; if the contamination level is still high, it prompts that the coolant needs to be replaced. It should be noted that: Figures 5 to 8 In this context, all Y values ​​represent "yes" and all N values ​​represent "no".

[0095] The pressure sensor 8, pressure sensor 9, impurity monitoring sensor, differential pressure sensor 55, and weight sensor 56 of this invention all communicate with the self-cleaning controller 6 via the CAN bus 16, forming a real-time dynamic closed-loop oil condition monitoring system. Pressure sensor 8 monitors the oil pressure at the outlet of the oil supply pump 2; pressure sensor 9 monitors the oil pressure at the outlet of the proportional directional valve 3; the impurity monitoring sensor identifies the oil contamination level; differential pressure sensor 55 determines the filter element blockage status; and weight sensor 56 determines whether the sedimentation chamber is fully loaded. The self-cleaning controller 6 integrates data from all sensors to intelligently adjust the opening of the proportional directional valve 3, the speed of the oil supply pump 2, and the cleaning mode, achieving automated management of the oil circulation status and filtration intensity.

[0096] The application realizes automatic oil cleaning under multiple working conditions such as vehicle running, parking, light load and heavy load by dynamic switching of the main oil circuit and the cleaning branch, avoids problems such as cooling performance decline, mechanical wear aggravation or oil circuit blockage caused by pollutant accumulation. Since the cleaning branch adopts a hierarchical filtering structure, the service life of the filter element can be effectively prolonged, the frequency of manual maintenance can be reduced, the cooling capacity of the motor stator, rotor and planetary gear set can be improved, and the long-term reliability of the electric drive assembly operation can be ensured.

[0097] In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "an example", "a specific example", or "some examples" and the like means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and integrate different embodiments or examples described in the present specification.

[0098] Although the embodiments of the present application have been shown and described above, it should be understood that the above-described embodiments are exemplary and should not be construed as limiting the present application, and those skilled in the art can make changes, modifications, replacements and variations to the above-described embodiments within the scope of the present application.

Claims

1. An online self-cleaning system for cooling oil in an oil-cooled electric drive assembly, wherein the housing of the oil-cooled electric drive assembly has a cooling oil inlet and a cooling oil outlet, characterized in that, include: An oil tank (1) and an oil supply pump (2), wherein the oil supply pump (2) is connected to the oil tank (1) for drawing cooling oil; The proportional directional valve (3) is connected to the oil inlet of the proportional directional valve (3) via a pipeline (21) to supply oil. The oil outlet of the proportional directional valve (3) is connected to the cooling oil inlet via a pipeline (31) to distribute cooling oil. The cooling oil outlet is connected to the return port of the oil tank (1) via a return oil pipeline (101) to return cooling oil. Cooling oil contamination detection component (4), which is connected to the pipeline (21) to detect the contamination level of the cooling oil it transports; The cooling oil cleaning assembly (5) has its outlet port 2 of the proportional reversing valve (3) connected to the inlet port of the cooling oil cleaning assembly (5) via pipeline 3 (32) to distribute the cooling oil to be purified; the outlet port of the cooling oil cleaning assembly (5) is connected to the return port of the oil tank (1) to deliver the purified cooling oil. The self-cleaning controller (6) is electrically connected to the oil supply pump (2), the proportional reversing valve (3) and the cooling oil contamination detection component (4) to receive the cooling oil contamination data fed back by the cooling oil contamination detection component (4) and thereby control the working state of the oil supply pump (2) and the proportional reversing valve (3).

2. The online self-cleaning system for cooling oil in an oil-cooled electric drive assembly according to claim 1, characterized in that, It also includes a flow control valve (7), which is installed on the second pipeline (31) to control the flow rate of the cooling oil supply.

3. The online self-cleaning system for cooling oil in an oil-cooled electric drive assembly according to claim 2, characterized in that, It also includes pressure sensor one (8) and pressure sensor two (9); pressure sensor one (8) is installed on the pipeline one (21) to detect the oil supply pressure; pressure sensor two (9) is installed on the pipeline two (31) and between the proportional directional valve (3) and the flow control valve (7) to detect the oil supply pressure; the self-cleaning controller (6) is electrically connected to pressure sensor one (8) and pressure sensor two (9).

4. The online self-cleaning system for cooling oil in an oil-cooled electric drive assembly according to claim 3, characterized in that, It also includes an overflow valve (10), the oil inlet of which is connected to the pipeline (21), and the oil outlet of which is connected to the return port of the oil tank (1).

5. The online self-cleaning system for cooling oil in an oil-cooled electric drive assembly according to claim 2, characterized in that, It also includes a flow divider valve (11); one end of the second pipeline (31) is connected to the oil outlet of the proportional directional valve (3), and the other end of the second pipeline (31) is connected to the oil inlet of the flow divider valve (11); the oil outlet of the flow divider valve (11) is connected to the oil inlet of the end cap oil passage of the motor of the oil-cooled electric drive assembly through a pipeline to supply cooling oil to the motor; the oil outlet of the second flow divider valve (11) is connected to the oil inlet of the fuel injection passage of the reducer of the oil-cooled electric drive assembly through a pipeline to supply cooling oil to the reducer. The cooling oil in the motor and the reducer can flow into the oil pan (12) of the oil-cooled electric drive assembly, and the cooling oil outlet is located on the oil pan (12).

6. The online self-cleaning system for cooling oil in an oil-cooled electric drive assembly according to claim 1, characterized in that, The cooling oil cleaning assembly (5) includes a cyclone separator (51), a magnetic particle collector (52), a precision filter (53), and a dirt collection and settling chamber (54). The oil outlet of the proportional directional valve (3) is connected to the oil inlet of the cyclone separator (51) via the pipeline (32) to distribute the cooling oil to be purified; the oil outlet of the cyclone separator (51) is connected to the oil inlet of the magnetic particle collector (52), the oil outlet of the magnetic particle collector (52) is connected to the oil inlet of the precision filter (53), the oil outlet of the precision filter (53) is connected to the oil inlet of the sludge settling chamber (54), and the oil outlet of the sludge settling chamber (54) is connected to the oil return port of the oil tank (1) to deliver the purified cooling oil.

7. The online self-cleaning system for cooling oil in an oil-cooled electric drive assembly according to claim 6, characterized in that, The cooling oil cleaning assembly (5) also includes a differential pressure sensor (55) and a weight sensor (56); the differential pressure sensor (55) is installed on the precision filter (53) to detect the differential pressure value between the inlet and outlet of the precision filter (53); the weight sensor (56) is installed on the dirt collection and settling chamber (54) to detect its weight change; the self-cleaning controller (6) is electrically connected to the differential pressure sensor (55) and the weight sensor (56).

8. A control method for an online self-cleaning system for cooling oil in an oil-cooled electric drive assembly, characterized in that, Using the online self-cleaning system for cooling oil of an oil-cooled electric drive assembly as described in any one of claims 1-7, the control method includes the following steps: The self-cleaning controller (6) controls the working state of the oil supply pump (2) and thus regulates the oil supply pressure; the cooling oil contamination detection component (4) detects the contamination degree of the cooling oil transported in pipeline 1 (21) in real time and uploads the contamination degree detection result to the self-cleaning controller (6); the self-cleaning controller (6) determines the contamination level of the cooling oil according to the relative relationship between the detected contamination degree and the preset contamination degree benchmark value, and then adjusts the oil output ratio of the oil outlet 1 and the oil outlet 2 of the proportional reversing valve (3) according to the determination result of the cooling oil contamination level.

9. The control method for an online self-cleaning system for cooling oil in an oil-cooled electric drive assembly according to claim 8, characterized in that, The self-cleaning controller (6) can execute different online self-cleaning modes of cooling oil according to the results of the cooling oil contamination level determination; the working modes include normal circulation mode, low intensity cleaning mode, high intensity cleaning mode, and alarm and protection mode; In normal circulation mode, the self-cleaning controller (6) controls the opening of the first oil outlet of the proportional directional valve (3), controls the closing of the second oil outlet of the proportional directional valve (3), and monitors the contamination level of the cooling oil transported in pipeline (21) in real time. In low-intensity cleaning mode and when the oil-cooled electric drive assembly is in operation, the self-cleaning controller (6) controls the oil outlet of the proportional directional valve (3) to be greater than the oil outlet of the proportional directional valve (3) and monitors the contamination level of the cooling oil transported in pipeline (21) in real time; in low-intensity cleaning mode and when the oil-cooled electric drive assembly is in shutdown mode, the self-cleaning controller (6) controls the oil outlet of the proportional directional valve (3) to be closed and controls the oil outlet of the proportional directional valve (3) to be opened, and monitors the contamination level of the cooling oil transported in pipeline (21) in real time. When the oil-cooled electric drive assembly is in operation under the high-intensity cleaning mode, the self-cleaning controller (6) controls the oil outlet 1 of the proportional reversing valve (3) to have an oil output less than that of the oil outlet 2 of the proportional reversing valve (3), and continuously monitors the contamination degree of the cooling oil conveyed in the pipeline 1 (21); when the oil-cooled electric drive assembly is in a stopped state under the high-intensity cleaning mode, the self-cleaning controller (6) controls the oil outlet 1 of the proportional reversing valve (3) to be closed, controls the oil outlet 2 of the proportional reversing valve (3) to be opened, and continuously monitors the contamination degree of the cooling oil conveyed in the pipeline 1 (21). In the alarm and protection mode, the self-cleaning controller (6) controls the oil outlet 1 of the proportional reversing valve (3) to be opened, controls the oil outlet 2 of the proportional reversing valve (3) to be closed, and gives an alarm to prompt the maintenance of the cooling oil cleaning component (5).

10. The control method for an online self-cleaning system for cooling oil in an oil-cooled electric drive assembly according to claim 9, characterized in that, According to the ratio of the contamination degree of the cooling oil conveyed in the pipeline 1 (21) to the preset contamination degree reference value a, the cooling oil contamination levels are divided into contamination level 1, contamination level 2, contamination level 3, contamination level 4, and contamination level 5. When the contamination degree ≥ a×90%, it is determined as contamination level 5 and enters the alarm and protection mode; when a×70% ≤ contamination degree < a×90%, it is determined as contamination level 4 and enters the high-intensity cleaning mode; when a×40% ≤ contamination degree < a×70%, it is determined as contamination level 3 and enters the low-intensity cleaning mode; when a×20% ≤ contamination degree < a×40%, it is determined as contamination level 2, and when the contamination degree < a×20%, it is determined as contamination level 1, and the normal circulation mode is maintained.

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