Oil-cooled electric drive system, control method of oil-cooled electric drive system, vehicle and medium

Abstract

The present application discloses an oil-cooled electric drive system, a control method of the oil-cooled electric drive system, a vehicle and a medium. The present application relates to the field of vehicle technology. The oil-cooled electric drive system includes: an electric drive transmission module, the electric drive transmission module includes an oil pan for storing oil; an electronic oil pump, the oil inlet of the electronic oil pump is connected to the oil outlet of the electric drive transmission module; an oil storage chamber, the oil inlet of the oil storage chamber is connected to the oil outlet of the electronic oil pump, the oil outlet of the oil storage chamber is connected to the oil inlet of the electric drive transmission module, the oil storage chamber includes an exhaust port and an exhaust valve, and the exhaust valve is arranged at the exhaust port; a shut-off valve, the shut-off valve is arranged on the connection path between the oil outlet of the oil storage chamber and the oil inlet of the electric drive transmission module; a micro control unit, the micro control unit is respectively connected to the exhaust valve and the shut-off valve for controlling the opening and closing of the exhaust valve and the shut-off valve. The present application can avoid the oil stirring phenomenon in the oil-cooled electric drive system to reduce the power loss of the oil-cooled electric drive system.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to an oil-cooled electric drive system, a control method for the oil-cooled electric drive system, a vehicle, and a medium. Background Art

[0002] With the continuous development of the automotive industry and technology, oil-cooled electric drive systems have gradually become the mainstream power solution for mid-to-high-end models. They are used to achieve effective cooling and lubrication of motors and reducers through oil circulation, thereby improving the vehicle's power transmission efficiency and service life.

[0003] At present, the motor cavity and reducer cavity in the oil-cooled electric drive system are connected, and an oil pan for storing oil is formed at the bottom of the two cavities. In order to meet the cooling needs of the motor and the lubrication needs of the reducer in the oil-cooled electric drive system, a certain amount of oil needs to be added to the oil-cooled electric drive system. At the same time, due to the space limitation in the Z direction of the vehicle, the gear of the reducer is partially immersed in the oil in the oil pan, which causes oil stirring when the gear rotates, and the motor rotor also stirs oil under some working conditions, which causes power loss of the oil-cooled electric drive system.

[0004] Therefore, how to avoid the oil stirring phenomenon in the oil-cooled electric drive system to reduce the power loss of the oil-cooled electric drive system is a problem that needs to be solved urgently. Summary of the invention

[0005] The main purpose of the present application is to provide an oil-cooled electric drive system, a control method for the oil-cooled electric drive system, a vehicle and a medium, aiming to avoid oil stirring in the oil-cooled electric drive system and reduce the power loss of the oil-cooled electric drive system.

[0006] To achieve the above objectives, the present application provides an oil-cooled electric drive system, the oil-cooled electric drive system comprising:

[0007] An electric drive transmission module, the electric drive transmission module comprising an oil pan for storing oil;

[0008] An electronic oil pump, the oil inlet of the electronic oil pump being in communication with the oil outlet of the electric drive transmission module;

[0009] An oil storage chamber, wherein the oil inlet of the oil storage chamber is communicated with the oil outlet of the electronic oil pump, the oil outlet of the oil storage chamber is communicated with the oil inlet of the electric drive transmission module, the oil storage chamber comprises an exhaust port and an exhaust valve, and the exhaust valve is arranged at the exhaust port;

[0010] A shut-off valve, the shut-off valve being arranged on a connecting passage between the oil outlet of the oil storage chamber and the oil inlet of the electric drive transmission module;

[0011] A micro control unit is respectively connected to the exhaust valve and the shut-off valve for controlling the opening and closing of the exhaust valve and the shut-off valve.

[0012] In one embodiment, the oil inlet and the exhaust port of the oil storage chamber are arranged at the highest point of the oil storage chamber, and the oil outlet of the oil storage chamber is located at a position lower than the oil inlet of the oil storage chamber.

[0013] In one embodiment, the capacity of the oil storage chamber is greater than the total oil volume in the oil-cooled electric drive system.

[0014] In one embodiment, the electric drive transmission module further includes a liquid level sensor, which is disposed inside the electric drive transmission module, and the position of the liquid level sensor is higher than the position of the oil outlet of the electric drive transmission module;

[0015] The liquid level sensor is communicatively connected with the micro control unit, and is used to monitor the oil level information of the oil pan and send the oil level information to the micro control unit, wherein the oil level information represents the oil level height in the oil pan.

[0016] In one embodiment, the micro control unit is configured to control the opening and closing of the exhaust valve and the shut-off valve based on the received oil level information.

[0017] In one embodiment, the oil-cooled electric drive system further comprises an oil cooler, the oil inlet of the oil cooler is communicated with the oil outlet of the oil storage chamber, and the oil outlet of the oil cooler is communicated with the oil inlet of the electric drive transmission module;

[0018] The shut-off valve is arranged on a connecting passage between the oil outlet of the oil storage chamber and the oil inlet of the oil cooler.

[0019] In addition, to achieve the above-mentioned purpose, the present application also provides a control method of an oil-cooled electric drive system, the control method of the oil-cooled electric drive system is applied to the oil-cooled electric drive system, and the control method of the oil-cooled electric drive system includes:

[0020] When it is detected that the oil level in the oil pan is greater than or equal to a preset height, the exhaust valve is controlled to be opened and the shut-off valve is controlled to be closed, so that the oil pumped by the electronic oil pump remains in the oil storage chamber;

[0021] When it is detected that the oil level in the oil pan is less than the preset height, the exhaust valve is controlled to be closed and the shut-off valve is controlled to be opened, so that the oil pumped by the electronic oil pump can circulate in the oil-cooled electric drive system.

[0022] In one embodiment, the oil-cooled electric drive system includes a liquid level sensor. Before the step of controlling the exhaust valve to open and the shut-off valve to close when the oil level in the oil pan is detected to be higher than a preset level, the step includes:

[0023] Monitoring the oil level information of the oil pan by the liquid level sensor, and sending the oil level information to the micro control unit, wherein the oil level information represents the height of the oil level in the oil pan;

[0024] After receiving the oil level information, the micro control unit determines whether the oil level in the oil pan is greater than or equal to a preset height based on the oil level information.

[0025] In addition, to achieve the above-mentioned purpose, the present application also provides a vehicle, which includes: the above-mentioned oil-cooled electric drive system, a memory, a processor, and a computer program stored on the memory and executable on the processor, and the computer program is configured to implement the steps of the control method of the oil-cooled electric drive system as described above.

[0026] In addition, to achieve the above-mentioned purpose, the present application also provides a storage medium, which is a computer-readable storage medium, and the computer-readable storage medium stores a program for implementing a control method for an oil-cooled electric drive system. The program for implementing a control method for an oil-cooled electric drive system is executed by a processor to implement the steps of the control method for an oil-cooled electric drive system as described above.

[0027] The present application provides an oil-cooled electric drive system, which includes an electric drive transmission module, an electronic oil pump, an oil storage chamber, a shut-off valve and a micro control unit, wherein the electric drive transmission module includes an oil pan, the oil inlet of the electronic oil pump is connected to the oil outlet of the electric drive transmission module, and the oil outlet of the electronic oil pump is connected to the oil inlet of the oil storage chamber, that is, the electronic oil pump can pump the oil in the oil pan to the oil storage chamber. The oil outlet of the oil storage chamber is connected to the oil inlet of the electric drive transmission module to form a circulation passage for the oil in the oil-cooled electric drive system. The oil storage chamber includes an exhaust port and an exhaust valve, and the exhaust valve is arranged at the exhaust port. When the exhaust valve is opened, the gas in the oil storage chamber can be discharged from the exhaust port. The shut-off valve is arranged on the connection passage between the oil outlet of the oil storage chamber and the oil inlet of the electric drive transmission module, that is, used to control the opening and closing of the connection passage. The micro control unit is respectively connected to the exhaust valve and the shut-off valve for controlling the opening and closing of the exhaust valve and the shut-off valve.

[0028] The present application can control the exhaust valve to open and the shut-off valve to close through the microcontroller unit, so that the electronic oil pump can pump the oil in the oil pan of the electric drive transmission module to the oil storage chamber. At this time, since the shut-off valve is closed, the oil pumped by the electronic oil pump will remain in the oil storage chamber, and since the exhaust valve is open, the gas pumped by the electronic oil pump will be discharged from the exhaust port of the oil storage chamber to ensure that there is enough space for storing the oil, thereby reducing the amount of oil in the oil pan. In addition, the present application can control the exhaust valve to close and the shut-off valve to open through the microcontroller unit, so that the oil pumped by the electronic oil pump can circulate in the oil-cooled electric drive system. At this time, the amount of oil pumped into the oil storage chamber by the electronic oil pump is equal to the amount of oil output from the oil outlet of the oil storage chamber, thereby ensuring that the amount of oil circulating in the oil-cooled electric drive system is stable, that is, ensuring that the amount of oil in the oil pan remains stable. In this way, the present application reduces the amount of oil in the oil pan and ensures that the amount of oil in the oil pan remains stable, thereby avoiding oil stirring in the oil-cooled electric drive system and reducing power loss of the oil-cooled electric drive system. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0030] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0031] Figure 1 This is a schematic structural diagram of the first embodiment of the oil-cooled electric drive system of the present application;

[0032] Figure 2 This is a schematic structural diagram of the second embodiment of the oil-cooled electric drive system of the present application;

[0033] Figure 3 This is a flow chart of a first embodiment of a control method for an oil-cooled electric drive system of the present application.

[0034] Description of Figure Numbers:

[0035] 10. Electric drive transmission module; 101. Oil pan; 102. Oil outlet of electric drive transmission module; 103. Oil inlet of electric drive transmission module; 104. Liquid level sensor; 20. Electronic oil pump; 201. Oil inlet of electronic oil pump; 202. Oil outlet of electronic oil pump; 30. Oil storage chamber; 301. Oil inlet of oil storage chamber; 302. Oil outlet of oil storage chamber; 303. Exhaust port; 304. Exhaust valve; 40. Shut-off valve; 50. Micro control unit; 60. Oil cooler; 601. Oil inlet of oil cooler; 602. Oil outlet of oil cooler.

[0036] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0037] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0038] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0039] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] It should be noted that if the embodiments of the present application involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0041] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the present application, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features limited to "first" and "second" can explicitly or implicitly include at least one of the features. In addition, if "and / or" or "and / or" appears in the full text, its meaning includes three parallel schemes. Taking "Scheme 1 and / or Scheme 2" as an example, it includes scheme 1, or scheme 2, or schemes that are satisfied by both scheme 1 and scheme 2. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in the field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection required by this application.

[0042] This application proposes an oil-cooled electric drive device, please refer to Figure 1 In the first embodiment of the present application, the oil-cooled electric drive device comprises:

[0043] The electric drive transmission module 10 includes an oil pan 101;

[0044] An electronic oil pump 20 , wherein an oil inlet 201 of the electronic oil pump 20 is connected to an oil outlet 102 of the electric drive transmission module 10 ;

[0045] An oil storage chamber 30, wherein an oil inlet 301 of the oil storage chamber 30 is communicated with an oil outlet 202 of the electronic oil pump 20, and an oil outlet 302 of the oil storage chamber 30 is communicated with an oil inlet 103 of the electric drive transmission module 10, and the oil storage chamber 30 comprises an exhaust port 303 and an exhaust valve 304, and the exhaust valve 304 is disposed at the exhaust port 303;

[0046] A shut-off valve 40 , the shut-off valve 40 being disposed on a connection passage between the oil outlet 302 of the oil storage chamber 30 and the oil inlet 102 of the electric drive transmission module 10 ;

[0047] The micro control unit 50 is respectively connected to the exhaust valve 304 and the shut-off valve 40 for controlling the opening and closing of the exhaust valve 304 and the shut-off valve 40 .

[0048] It should be noted that the electric drive transmission module 10 includes a motor unit, a reducer unit and an oil pan 101, wherein the motor unit includes a motor cavity, the reducer unit includes a reducer cavity, the motor cavity and the reducer cavity are connected, the oil pan 101 is the bottom of the motor cavity and the reducer cavity, the motor unit includes a stator, a rotor and a bearing, the reducer unit includes gears and bearings, when there is too much oil in the oil pan 101, the rotor of the motor unit and the gears of the reducer unit will be stirred, causing power loss of the oil-cooled electric drive system, and generating heat, affecting the working performance and working efficiency of the oil-cooled electric drive system.

[0049] The oil-cooled electric drive system includes an electric drive transmission module 10, an electronic oil pump 20, an oil storage chamber 30, a shut-off valve 40 and a micro control unit 50. The electric drive transmission module 10 includes an oil pan 101 for storing oil. The oil inlet 201 of the electronic oil pump 20 is connected to the oil outlet 102 of the electric drive transmission module 10, and the oil outlet 202 of the electronic oil pump 20 is connected to the oil inlet 301 of the oil storage chamber 30, so that the electronic oil pump 20 can pump the oil in the oil pan 101 to the oil storage chamber 30. The oil outlet 302 of the oil storage chamber 30 is connected to the oil inlet 103 of the electric drive transmission module 10 to form a circulation path in the oil-cooled electric drive system. The oil storage chamber 30 includes an exhaust port 303 and an exhaust valve 304, and the exhaust valve 304 is arranged at the exhaust port 303, that is, when the exhaust valve 304 is opened, the gas in the oil storage chamber 30 can be discharged from the exhaust port 303. The shutoff valve 40 is disposed on the connection passage between the oil outlet 302 of the oil storage chamber 30 and the oil inlet 102 of the electric drive transmission module 10, that is, the shutoff valve 40 is used to control the on-off of the connection passage between the oil outlet 302 of the oil storage chamber 30 and the oil inlet 102 of the electric drive transmission module 10. The micro control unit 50 is respectively connected to the exhaust valve 304 and the shutoff valve 40 for controlling the opening and closing of the exhaust valve 304 and the shutoff valve 40.

[0050] In this way, the embodiment of the present application can control the exhaust valve to open and the shut-off valve to close through the microcontroller unit, so that the electronic oil pump can pump the oil in the oil pan of the electric drive transmission module to the oil storage chamber. At this time, since the shut-off valve is closed, the oil pumped by the electronic oil pump will remain in the oil storage chamber, and since the exhaust valve is open, the gas pumped by the electronic oil pump will be discharged from the exhaust port of the oil storage chamber to ensure sufficient space for storing the oil, thereby reducing the amount of oil in the oil pan. And, the present application can control the exhaust valve to close and the shut-off valve to open through the microcontroller unit, so that the oil pumped by the electronic oil pump can circulate in the oil-cooled electric drive system. At this time, the amount of oil pumped into the oil storage chamber by the electronic oil pump is equal to the amount of oil output from the oil outlet of the oil storage chamber, thereby ensuring that the amount of oil circulating in the oil-cooled electric drive system is stable, that is, ensuring that the amount of oil in the oil pan remains stable. Therefore, the embodiment of the present application reduces the amount of oil in the oil pan and ensures that the amount of oil in the oil pan remains stable, thereby avoiding the oil stirring phenomenon that occurs in the oil-cooled electric drive system and reducing the power loss of the oil-cooled electric drive system.

[0051] Further, refer to Figure 2 In the second embodiment of the present application, the oil inlet 301 and the exhaust port 303 of the oil storage chamber 30 are arranged at the highest point of the oil storage chamber 30, and the oil outlet 302 of the oil storage chamber 30 is located at a position lower than the oil inlet 301 of the oil storage chamber 30.

[0052] It should be noted that the oil inlet 301 and the exhaust port of the oil storage chamber 30 are arranged at the highest point of the oil storage chamber 30 so that the gas mixed in the oil pumped by the electronic oil pump 20 can be discharged better. The oil outlet 302 of the oil storage chamber 30 is arranged at a relatively low point of the oil storage chamber 30 to prevent the oil on the surface of the oil storage chamber 30 from rolling and carrying the gas to be discharged from the oil outlet when the vehicle bumps. It should be understood that when the oil outlet 302 of the oil storage chamber 30 is at a lower position, the probability that the oil outlet 302 does not contact the gas is greater.

[0053] In this embodiment, the capacity of the oil storage chamber 30 is greater than the total oil volume in the oil-cooled electric drive system.

[0054] It should be noted that the sum of all the oil used for cooling and softening in the oil-cooled electric drive system is the total oil volume in the oil-cooled electric drive system. The capacity of the oil storage chamber 302 is greater than the total oil volume in the oil-cooled electric drive system to ensure that when the exhaust valve 304 is opened and the shut-off valve 40 is closed, and the electronic oil pump 20 is working, the volume of the oil storage chamber 30 is sufficient to store the oil pumped by the electronic oil pump 20.

[0055] In this embodiment, the electric drive transmission module further includes a liquid level sensor 104, which is disposed inside the electric drive transmission module 10, and the position of the liquid level sensor 104 is higher than the position of the oil outlet 103 of the electric drive transmission module 10;

[0056] The liquid level sensor 104 is in communication connection with the micro control unit 50 , and is used to monitor the oil level information of the oil pan 101 and send the oil level information to the micro control unit 50 , wherein the oil level information represents the oil level height in the oil pan 101 .

[0057] The liquid level sensor 104 is disposed inside the electric drive transmission module 10, and the position of the liquid level sensor 104 is higher than the position of the oil outlet 103 of the electric drive transmission module 10, so that when the oil level in the oil pan 101 does not reach the installation height of the liquid level sensor 104, the electronic oil pump 20 can also pump out the oil for circulation in the oil-cooled drive system from the oil pan 101. The liquid level sensor 104 is connected to the micro control unit 50 for communication, and the liquid level sensor 104 is used to monitor the oil level information of the oil pan 101 and send the oil level information to the micro control unit 50 connected to it for communication.

[0058] It should be noted that the oil level information represents the height of the oil level in the oil pan 101. The embodiment of the present application does not limit the form of the oil level information. For example, the oil level information is an alarm signal, that is, the level sensor 104 sends an alarm signal to the micro control unit 50 when it detects that the oil level in the oil pan 101 reaches the height of the level sensor 104. In other words, when the micro control unit 50 receives the alarm signal, it determines that the current oil level in the oil pan 101 is greater than or equal to the preset height (that is, the installation height of the level sensor 104). For another example, the oil level information is "has not reached the preset height" or "has reached the preset height". Specifically, the level sensor 104 can be set to send the oil level information to the micro control unit 50 at a fixed interval. In other words, the micro control unit 50 determines the oil level in the oil pan 101 at the current moment based on the received oil level information.

[0059] In this embodiment, the micro control unit 50 is configured to control the opening and closing of the exhaust valve 304 and the shut-off valve 40 based on the received oil level information.

[0060] It should be noted that the microcontroller unit 50 is configured to control the exhaust valve 304 and the shut-off valve 40 to open or close based on the received oil level information. Specifically, when the microcontroller unit 50 determines that the oil level in the oil pan 101 is greater than or equal to a preset height based on the oil level information, the exhaust valve 304 is controlled to open and the shut-off valve 40 is controlled to close. When the microcontroller unit 50 determines that the oil level in the oil pan 101 is less than a preset height based on the oil level information, the exhaust valve 304 is controlled to close and the shut-off valve 40 is controlled to open.

[0061] In this embodiment, the oil-cooled electric drive system further includes an oil cooler 60, an oil inlet 601 of the oil cooler 60 is communicated with the oil outlet 302 of the oil storage chamber 30, and the oil outlet 602 of the oil cooler 60 is communicated with the oil inlet 102 of the electric drive transmission module 10;

[0062] The shut-off valve 40 is disposed on a connection passage between the oil outlet 302 of the oil storage chamber 30 and the oil inlet 601 of the oil cooler 60 .

[0063] It should be noted that the oil-cooled drive system further includes an oil cooler 60 , and the oil cooler 60 is used to cool the oil flowing through the oil cooler 60 .

[0064] The oil inlet 601 of the oil cooler 60 is connected to the oil outlet 302 of the oil storage chamber 30, and the oil outlet 602 of the oil cooler is connected to the oil inlet 102 of the electric drive transmission module 10. The shut-off valve 40 is arranged on the connection passage between the oil outlet 302 of the oil storage chamber 30 and the oil inlet 601 of the oil cooler 60.

[0065] In this way, the embodiment of the present application monitors the oil level information in the oil pan 101 by setting up a liquid level sensor 104, and sends the oil level information to the micro control unit 50, so that the micro control unit 50 controls the opening and closing of the exhaust valve 304 and the shut-off valve 40 based on the oil level information, thereby reducing the amount of oil in the oil pan and ensuring that the oil amount in the oil pan remains stable, thereby avoiding the oil stirring phenomenon in the oil-cooled electric drive system and reducing the power loss of the oil-cooled electric drive system.

[0066] In addition, the present invention also provides a control method for an oil-cooled electric drive system, please refer to Figure 3 , Figure 3 This is a flow chart of the first embodiment of the control method of the oil-cooled electric drive system of the present application. It should be noted that although the logical order is shown in the flow chart, in some cases, the control method of the oil-cooled electric drive system of the present application can of course also perform the steps shown or described in a different order from that here. In the first embodiment of the control method of the oil-cooled electric drive system, the control method of the oil-cooled electric drive system is applied to the oil-cooled electric drive system as described above, and the control method of the oil-cooled electric drive system includes steps S10 to S20:

[0067] Step S10, when it is detected that the oil level in the oil pan is greater than or equal to a preset height, controlling the exhaust valve to open and the shut-off valve to close, so that the oil pumped by the electronic oil pump remains in the oil storage chamber;

[0068] Step S20, when it is detected that the oil level in the oil pan is less than the preset height, the exhaust valve is controlled to be closed and the shut-off valve is controlled to be opened, so that the oil pumped by the electronic oil pump can circulate in the oil-cooled electric drive system.

[0069] It should be noted that the oil-cooled electric drive system includes: an electric drive transmission module, the electric drive transmission module includes an oil pan for storing oil; an electronic oil pump, the oil inlet of the electronic oil pump is connected to the oil outlet of the electric drive transmission module; an oil storage chamber, the oil inlet of the oil storage chamber is connected to the oil outlet of the electronic oil pump, the oil outlet of the oil storage chamber is connected to the oil inlet of the electric drive transmission module, the oil storage chamber includes an exhaust port and an exhaust valve, the exhaust valve is arranged at the exhaust port; a shut-off valve, the shut-off valve is arranged on the connecting path between the oil outlet of the oil storage chamber and the oil inlet of the electric drive transmission module; a micro control unit, the micro control unit is respectively communicated with the exhaust valve and the shut-off valve, and is used to control the opening and closing of the exhaust valve and the shut-off valve.

[0070] In addition, it should be noted that the minimum height that can cause the rotor in the motor unit and the gear in the reducer unit to stir the oil is preset as a preset height. Exemplarily, a liquid level sensor is arranged inside the electric drive transmission module, and the installation height of the liquid level sensor is the above-mentioned preset height.

[0071] When it is detected that the oil level in the oil pan in the electric drive transmission module is greater than or equal to the preset height, the exhaust valve is controlled to open and the shut-off valve is controlled to close, so that the oil pumped from the oil pan by the electronic oil pump remains in the oil storage chamber, thereby reducing the amount of oil in the oil pan, and the gas pumped into the oil storage chamber by the electronic oil pump is discharged from the exhaust valve. At the same time, when it is detected that the oil level in the oil pan is less than the preset height, the exhaust valve is controlled to close and the shut-off valve is controlled to open, so that the oil pumped by the electronic oil pump circulates in the oil-cooled electric drive system, that is, when the exhaust valve is closed and the shut-off valve is opened, the oil storage chamber is filled with gas and oil. At this time, the amount of oil pumped to the oil storage chamber by the electronic oil pump is equal to the amount of oil discharged from the oil outlet of the oil storage chamber, thereby ensuring the stability of the oil amount in the oil pan. In other words, there is basically no oil stirring phenomenon of the gears and rotors at this time, and there is no oil stirring loss.

[0072] In this embodiment, the oil-cooled electric drive system includes a liquid level sensor. Before step S10, the control method of the oil-cooled electric drive system of the present application further includes:

[0073] Step A10, monitoring the oil level information of the oil pan by the liquid level sensor, and sending the oil level information to the micro control unit, wherein the oil level information represents the height of the oil level in the oil pan;

[0074] Step A20: After receiving the oil level information, the micro control unit determines whether the oil level in the oil pan is greater than or equal to a preset height based on the oil level information.

[0075] The oil-cooled electric drive system includes a liquid level sensor, which is installed inside the electric drive transmission module and is used to monitor the oil level information of the oil pan and send the monitored oil level information to the micro control unit. The oil level information represents the oil level in the oil pan. After receiving the oil level information, the micro control unit determines whether the oil level in the oil pan is greater than or equal to the preset height based on the oil level information to perform subsequent operations.

[0076] It should be noted that due to the special driving scenarios of the vehicle (sudden acceleration and deceleration or uphill and downhill), the oil in the oil pan will tilt, causing the electronic oil pump to pump gas into the oil storage chamber. Part of the oil in the oil storage chamber is replaced by an equal amount of gas, and the replaced oil flows to the electric drive transmission module, that is, it accumulates in the oil pan, causing the oil level in the oil pan to rise. Therefore, it is necessary to set a liquid level sensor to monitor the oil level in the oil pan in real time. When it is detected that the oil level in the oil pan is higher than the preset height, the exhaust valve can be controlled to open and the shut-off valve to close again, thereby reducing the oil accumulated in the oil pan and avoiding oil stirring.

[0077] Thus, the oil-cooled electric drive system of the present application includes an electric drive transmission module, an electronic oil pump, an oil storage chamber, a shut-off valve and a micro control unit, wherein the electric drive transmission module includes an oil pan, the oil inlet of the electronic oil pump is connected to the oil outlet of the electric drive transmission module, and the oil outlet of the electronic oil pump is connected to the oil inlet of the oil storage chamber, that is, the electronic oil pump can pump the oil in the oil pan to the oil storage chamber. The oil outlet of the oil storage chamber is connected to the oil inlet of the electric drive transmission module to form a circulation passage for the oil in the oil-cooled electric drive system. The oil storage chamber includes an exhaust port and an exhaust valve, and the exhaust valve is arranged at the exhaust port. When the exhaust valve is opened, the gas in the oil storage chamber can be discharged from the exhaust port. The shut-off valve is arranged on the connection passage between the oil outlet of the oil storage chamber and the oil inlet of the electric drive transmission module, that is, used to control the on-off of the connection passage. The micro control unit is respectively connected to the exhaust valve and the shut-off valve for controlling the opening and closing of the exhaust valve and the shut-off valve.

[0078] The embodiment of the present application can control the exhaust valve to open and the shut-off valve to close through the microcontroller unit, so that the electronic oil pump can pump the oil in the oil pan of the electric drive transmission module to the oil storage chamber. At this time, since the shut-off valve is closed, the oil pumped by the electronic oil pump will remain in the oil storage chamber, and since the exhaust valve is open, the gas pumped by the electronic oil pump will be discharged from the exhaust port of the oil storage chamber to ensure sufficient space for storing the oil, thereby reducing the amount of oil in the oil pan. In addition, the present application can control the exhaust valve to close and the shut-off valve to open through the microcontroller unit, so that the oil pumped by the electronic oil pump can circulate in the oil-cooled electric drive system. At this time, the amount of oil pumped into the oil storage chamber by the electronic oil pump is equal to the amount of oil output from the oil outlet of the oil storage chamber, thereby ensuring that the amount of oil circulating in the oil-cooled electric drive system is stable, that is, ensuring that the amount of oil in the oil pan remains stable. In this way, the embodiment of the present application reduces the amount of oil in the oil pan and ensures that the amount of oil in the oil pan remains stable, thereby avoiding the oil stirring phenomenon that occurs in the oil-cooled electric drive system and reducing the power loss of the oil-cooled electric drive system.

[0079] The present application also proposes a vehicle which is integrated with an oil-cooled electric drive system. The specific structure of the oil-cooled electric drive system refers to the above-mentioned embodiment. Since the present vehicle adopts all the technical solutions of all the above-mentioned embodiments, it has at least all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be described one by one here.

[0080] In addition, the present application also provides a computer-readable storage medium, on which a control program of the oil-cooled electric drive system is stored. When the control program of the oil-cooled electric drive system is executed by a processor, the control method of the oil-cooled electric drive system is implemented.

[0081] The specific implementation of the computer-readable storage medium of the present application is basically the same as the various embodiments of the control method of the oil-cooled electric drive system mentioned above, and will not be repeated here.

[0082] The above are only preferred embodiments of the present application, and are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent processing scope of the present application.

Claims

1. A control method for an oil-cooled electric drive system, characterized in that: The control method of the oil-cooled electric drive system is applied to the oil-cooled electric drive system, the oil-cooled electric drive system comprises an electric drive transmission module, an electronic oil pump, an oil storage chamber, a shut-off valve and a micro control unit, the electric drive transmission module comprises an oil pan for storing oil, the oil inlet of the electronic oil pump is communicated with the oil outlet of the electric drive transmission module, the oil inlet of the oil storage chamber is communicated with the oil outlet of the electronic oil pump, the oil outlet of the oil storage chamber is communicated with the oil inlet of the electric drive transmission module, the oil storage chamber comprises an exhaust port and an exhaust valve, the exhaust valve is arranged at the exhaust port, and the shut-off valve is arranged on the connection path between the oil outlet of the oil storage chamber and the oil inlet of the electric drive transmission module; The control method of the oil-cooled electric drive system includes: When it is detected that the oil level in the oil pan is greater than or equal to a preset height, the exhaust valve is controlled to be opened and the shut-off valve is controlled to be closed, so that the oil pumped by the electronic oil pump remains in the oil storage chamber; When it is detected that the oil level in the oil pan is less than the preset height, the exhaust valve is controlled to be closed and the shut-off valve is controlled to be opened, so that the oil pumped by the electronic oil pump can circulate in the oil-cooled electric drive system.

2. The control method of the oil-cooled electric drive system according to claim 1, characterized in that: The oil-cooled electric drive system includes a liquid level sensor, which is arranged inside the electric drive transmission module, and the position of the liquid level sensor is higher than the position of the oil outlet of the electric drive transmission module; Before the step of controlling the exhaust valve to open and the shut-off valve to close when the oil level in the oil pan is detected to be higher than a preset level, the method comprises: Monitoring the oil level information of the oil pan by the liquid level sensor, and sending the oil level information to the micro control unit, wherein the oil level information represents the height of the oil level in the oil pan; After receiving the oil level information, the micro control unit determines whether the oil level in the oil pan is greater than or equal to a preset height based on the oil level information.

3. The control method of the oil-cooled electric drive system according to claim 1, characterized in that: The oil inlet and the exhaust port of the oil storage chamber are arranged at the highest point of the oil storage chamber, and the oil outlet of the oil storage chamber is located at a position lower than the oil inlet of the oil storage chamber.

4. The control method of the oil-cooled electric drive system according to claim 1, characterized in that: The capacity of the oil storage chamber is greater than the total oil volume in the oil-cooled electric drive system.

5. The control method of the oil-cooled electric drive system according to claim 1, characterized in that: The oil-cooled electric drive system further comprises an oil cooler, the oil inlet of the oil cooler is communicated with the oil outlet of the oil storage chamber, and the oil outlet of the oil cooler is communicated with the oil inlet of the electric drive transmission module; The shut-off valve is arranged on a connecting passage between the oil outlet of the oil storage chamber and the oil inlet of the oil cooler.

6. A vehicle, characterized in that: The vehicle includes: an oil-cooled electric drive system, a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of a control method for an oil-cooled electric drive system as described in any one of claims 1 to 5.

7. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the control method of the oil-cooled electric drive system according to any one of claims 1 to 5 are implemented.

Images