Cooling and lubricating system and automobile

Abstract

The embodiment of the utility model provides a cooling and lubricating system which is applied to an electric drive system of an automobile, the cooling and lubricating system comprises a first oil way, a second oil way, a pump body, a switching valve, an oil cooler and a switching valve, the first oil way is used for guiding oil liquid to a device to be lubricated, and the second oil way is used for guiding the oil liquid to the device to be cooled; an inlet of the switching valve communicates with an oil outlet of the pump body, the switching valve comprises a first working position and a second working position, the switching valve is used for guiding oil output by the pump body to one of the first oil way and the second oil way at the first working position, and the switching valve is used for guiding the oil output by the pump body to the first oil way and the second oil way at the second working position. The oil cooler is located on the oil way between the switching valve and the pump body, and the switching valve is located on the oil way between the switching valve and the pump body and connected with the oil cooler in parallel. Therefore, the number of parts of the cooling and lubricating system is reduced, and the structure of the cooling and lubricating system is simplified.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, specifically to a cooling and lubrication system and an automobile. Background Technology

[0002] With the development of new energy vehicle technology, the requirements for electric drive systems are becoming increasingly stringent. When a car's electric drive system is operating, it requires a cooling and lubrication system to lubricate and cool its various modules. Among related technologies, the cooling and lubrication system has a complex structure, increasing the production cost of automobiles. Utility Model Content

[0003] One objective of this application is to provide a cooling and lubrication system to simplify the structure of the cooling and lubrication system; another objective is to provide an automobile.

[0004] To achieve the above objectives, the technical solution adopted in this application is as follows:

[0005] The first aspect of this application provides a cooling and lubrication system for use in an electric drive system of an automobile. The cooling and lubrication system includes:

[0006] The first oil circuit is used to guide the oil to the device to be lubricated, and the second oil circuit is used to guide the oil to the device to be cooled.

[0007] Pump body;

[0008] The switching valve has its inlet connected to the oil outlet of the pump body. The switching valve includes a first working position and a second working position. In the first working position, the switching valve is used to direct the oil output from the pump body to one of the first oil circuit and the second oil circuit. In the second working position, the switching valve is used to direct the oil output from the pump body to the first oil circuit and the second oil circuit, or to the other of the first oil circuit and the second oil circuit.

[0009] The oil cooler is located in the oil line between the switching valve and the pump body.

[0010] The switching valve is located in the oil line between the switching valve and the pump body, and is connected in parallel with the oil cooler.

[0011] In some implementations, the switching valve is one of a two-position three-way valve and a three-position three-way valve.

[0012] In some implementations, the switching valve includes a third operating position.

[0013] In the first working position, the switching valve is used to direct the oil to the first oil circuit;

[0014] In the second working position, the switching valve is used to direct the oil to the first oil passage and the second oil passage;

[0015] In the third working position, the switching valve is used to direct the oil to the second oil circuit.

[0016] In some embodiments, the cooling and lubrication system includes a sensor connected to the oil outlet of the pump body, the sensor being used to detect the temperature of the oil output by the pump body;

[0017] When the oil temperature is higher than the preset value, the oil cooler is used to direct the oil output from the pump to the switching valve;

[0018] When the temperature of the oil is less than or equal to a preset value, the switching valve is used to direct the oil output from the pump to the switching valve.

[0019] In some implementations, the cooling and lubrication system includes a controller electrically connected to a switching valve and a switching valve.

[0020] In some embodiments, the cooling and lubrication system includes a third oil passage, a throttling structure, and a return oil passage. The return oil passage is connected to the device to be cooled, the third oil passage is connected to the return oil passage and the first oil passage, and the throttling structure is disposed in the third oil passage. The throttling structure is used to guide a portion of the oil from the return oil passage to the first oil passage.

[0021] In some embodiments, the cooling and lubrication system includes a filter disposed on the oil inlet side of the pump body, the filter being used to filter the oil.

[0022] In some embodiments, the cooling and lubrication system includes a pump body motor connected to the pump body, which drives the pump body to operate.

[0023] A second aspect of this application provides an automobile, including the cooling and lubrication system and the electric drive system described in the first aspect of this application. The electric drive system includes a motor, a reducer, and a bearing. The motor includes a stator and a rotor. A first oil circuit is connected to the reducer and the bearing, and a second oil circuit is connected to the stator and the rotor of the motor.

[0024] In some embodiments, the electric drive system is a distributed electric drive system, with multiple motors and multiple reducers. A first oil circuit is connected to multiple reducers and bearings, and a second oil circuit is connected to the stator and rotor of multiple motors.

[0025] The cooling and lubrication system provided in this application embodiment, through the cooperation of switching valves and on / off valves, only requires one pump body to perform zoned control of the first oil circuit and the second oil circuit, thereby decoupling the needs of the devices to be lubricated and the devices to be cooled. This helps to reduce the number of components in the cooling and lubrication system, simplify the structure of the cooling and lubrication system, and thus reduce the production cost of automobiles. Attached Figure Description

[0026] Figure 1 A schematic diagram of a cooling and lubrication system provided in an embodiment of this application;

[0027] Figure 2 A schematic diagram of another cooling and lubrication system provided in this application embodiment;

[0028] Figure 3 A schematic diagram of a switching valve in the first working position for another cooling and lubrication system provided in an embodiment of this application;

[0029] Figure 4 for Figure 3 The schematic diagram of the switching valve of the cooling and lubrication system in the second working position is shown.

[0030] Figure 5 for Figure 3 The schematic diagram of the switching valve of the cooling and lubrication system in the third working position is shown.

[0031] Figure 6 A flowchart illustrating the requirements for a speed reducer as provided in an embodiment of this application;

[0032] Figure 7 A schematic diagram of the pump body rotation speed during traffic jams or low-speed driving provided in an embodiment of this application;

[0033] Figure 8 This is a schematic diagram illustrating the simultaneous demand for a speed reducer and a motor as provided in an embodiment of this application.

[0034] Among them, 100, cooling and lubrication system; 12, first oil circuit; 14, second oil circuit; 16, pump body; 18, switching valve; 181, inlet; 182, first outlet; 183, second outlet; 20, oil cooler; 22, switching valve; 23, oil pan; 24, sensor; 26, third oil circuit; 28, throttling structure; 30, return oil circuit; 32, filter; 34, pump body motor; 1000, automobile; 200, electric drive system; 210, device to be lubricated; 211, reducer; 212, bearing; 220, device to be cooled; 221, motor; 222, stator; 223, rotor. Detailed Implementation

[0035] The embodiments of this application will be described below with reference to the accompanying drawings and preferred embodiments. Those skilled in the art can easily understand other advantages and effects of this application from the content disclosed in this specification. This application can also be implemented or applied through other different specific embodiments, and various details in this specification can also be modified or changed based on different viewpoints and applications without departing from the spirit of this application. It should be understood that the preferred embodiments are only for illustrating this application and are not intended to limit the scope of protection of this application.

[0036] It should be noted that the illustrations provided in the following embodiments are only schematic representations of the basic concept of this application. Therefore, the drawings only show the components related to this application and are not drawn according to the actual number, shape and size of the components in the actual implementation. In the actual implementation, the form, quantity and proportion of each component can be arbitrarily changed, and the layout of the components may also be more complex.

[0037] Please see Figure 1 The first aspect of this application provides a cooling and lubrication system 100, which is applied to the electric drive system 200 of an automobile 1000. The cooling and lubrication system 100 includes a first oil passage 12, a second oil passage 14, a pump body 16, a switching valve 18, an oil cooler 20, and a switching valve 22.

[0038] The first oil passage 12 is used to guide oil to the device to be lubricated 210, and the second oil passage 14 is used to guide oil to the device to be cooled 220. The inlet 181 of the switching valve 18 is connected to the oil outlet of the pump body 16. The switching valve 18 includes a first working position and a second working position. In the first working position, the switching valve 18 is used to guide the oil output from the pump body 16 to one of the first oil passage 12 and the second oil passage 14. In the second working position, the switching valve 18 is used to guide the oil output from the pump body 16 to the first oil passage 12 and the second oil passage 14, or to the other of the first oil passage 12 and the second oil passage 14.

[0039] The oil cooler 20 is located in the oil line between the switching valve 18 and the pump body 16, and the switching valve 22 is located in the oil line between the switching valve 18 and the pump body 16, and is connected in parallel with the oil cooler 20.

[0040] It should be noted that, in the first operating position, the switching valve 18 is used to direct the oil output from the pump body 16 to one of the first oil passage 12 and the second oil passage 14. In the second operating position, the switching valve 18 is used to direct the oil output from the pump body 16 to the first oil passage 12 and the second oil passage 14, or to the other of the first oil passage 12 and the second oil passage 14, including the following situations:

[0041] The first type: In the first working position, the switching valve 18 is used to guide the oil output by the pump body 16 to the first oil circuit 12. In the second working position, the oil is guided to the first oil circuit 12 and the second oil circuit 14.

[0042] The second type: In the first working position, the switching valve 18 is used to guide the oil output by the pump body 16 to the first oil circuit 12, and in the second working position, the oil is guided to the second oil circuit 14.

[0043] The third type: In the first working position, the switching valve 18 is used to guide the oil output by the pump body 16 to the second oil circuit 14. In the second working position, the oil is guided to the first oil circuit 12 and the second oil circuit 14.

[0044] The fourth type: In the first working position, the switching valve 18 is used to guide the oil output by the pump body 16 to the second oil circuit 14. In the second working position, the oil is guided to the first oil circuit 12.

[0045] The cooling and lubrication system 100 provided in this application embodiment, through the cooperation of switching valve 18 and on / off valve 22, only requires one pump body 16 to perform zone control of the first oil circuit 12 and the second oil circuit 14, thereby decoupling the needs of the device to be lubricated 210 and the device to be cooled 220. This helps to reduce the number of parts in the cooling and lubrication system 100, simplify the structure of the cooling and lubrication system 100, and thus reduce the production cost of the automobile 1000.

[0046] For example, the first oil passage 12 can be a lubricating oil passage, and the second oil passage 14 can be a cooling oil passage. The oil in the first oil passage 12 lubricates the device 210 to be lubricated, and the oil in the second oil passage 14 cools the device 220 to be cooled. Both the device 210 to be lubricated and the device 220 to be cooled can be some components in the powertrain of the vehicle 1000. For example, the device 210 to be lubricated can be the reducer 211 and bearing 212 in the electric drive system 200, and the device 220 to be cooled can be the motor 221 in the electric drive system 200.

[0047] The pump body 16 can be a gear pump, screw pump, vane pump, or piston pump, etc., and is used to drive the oil to flow in the cooling and lubrication system 100. The type of pump body 16 can be selected according to actual needs.

[0048] The switching valve 18 and the on / off valve 22 can select and switch the oil path to meet the different oil requirements of the electric drive system 200.

[0049] The oil cooler 20 can be a water-cooled oil cooler, which contains coolant. When the oil flows through the water-cooled oil cooler, it exchanges heat with the coolant in the water-cooled oil cooler, thereby reducing the oil temperature.

[0050] The switching valve 22 and the oil cooler 20 are connected in parallel, so that the oil can flow to the switching valve 18 through the switching valve 22, or flow to the switching valve 18 after being cooled by the oil cooler 20.

[0051] It should be noted that the on / off valve 22 refers to a valve that has at least two states: opening the oil passage and closing the oil passage. The specific type of on / off valve 22 is not limited.

[0052] For example, in one embodiment, the switching valve 22 is a two-position two-way valve, meaning that the switching valve 22 has two working positions. In one working position, the inlet and outlet of the switching valve 22 are connected, and the oil output from the pump body 16 flows to the switching valve 18 after passing through the switching valve 22. In the other working position, the inlet and outlet of the switching valve 22 are disconnected, and the oil output from the pump body 16 flows to the switching valve 18 after passing through the oil cooler 20. In other embodiments, the switching valve 22 may also be a ball valve, etc.

[0053] The cooling and lubrication system 100 also includes an oil pan 23, which can also be understood as an oil tank. The oil pan 23 is used to store oil. In one embodiment, the oil pan 23 is made of plastic material. The first oil passage 12 and the second oil passage 14 use the same pump body 16 to draw oil from the oil pan 23, which can reduce oil churning losses and improve the efficiency of the electric drive system 200.

[0054] Please see Figures 1-3 In some embodiments, the switching valve 18 is one of a two-position three-way valve and a three-position three-way valve.

[0055] The switching valve 18 can adopt a one-in-two-out control mode, that is, the switching valve 18 has an inlet 181, a first outlet 182 and a second outlet 183. The inlet 181 is connected to the oil outlet of the pump body 16, and the first outlet 182 and the second outlet 183 are respectively connected to the first oil circuit 12 and the second oil circuit 14.

[0056] like Figure 1 As shown, the two-position three-way valve has two working positions. In the first working position, the inlet 181 is connected to either the first outlet 182 or the second outlet 183, and the switching valve 18 is used to guide the oil output by the pump body 16 to either the first oil passage 12 or the second oil passage 14. In the second working position, the inlet 181 is connected to both the first outlet 182 and the second outlet 183, and the switching valve 18 is used to guide the oil output by the pump body 16 to both the first oil passage 12 and the second oil passage 14.

[0057] like Figure 2 As shown, the two-position three-way valve has two working positions. In the first working position, the inlet 181 is connected to the first outlet 182, and the switching valve 18 is used to guide the oil output by the pump body 16 to the first oil passage 12. In the second working position, the inlet 181 is connected to the second outlet 183, and the switching valve 18 is used to guide the oil output by the pump body 16 to the second oil passage 14.

[0058] Please see Figures 3-5 In some embodiments, the switching valve 18 includes a third working position. In the first working position, the switching valve 18 is used to direct oil to the first oil passage 12; in the second working position, the switching valve 18 is used to direct oil to the first oil passage 12 and the second oil passage 14; and in the third working position, the switching valve 18 is used to direct oil to the second oil passage 14.

[0059] In this way, the three requirements of the electric drive system 200 correspond one-to-one with the three working positions of the switching valve 18, which makes it easy to control the working position of the switching valve 18 according to the different requirements of the electric drive system 200, so that the oil flow path can be switched conveniently and accurately.

[0060] For example, the first outlet 182 is connected to the first oil passage 12, and the second outlet 183 is connected to the second oil passage 14. Figure 3 As shown, in the first working position, inlet 181 is connected to first outlet 182, and all oil flows to the first oil passage 12 to lubricate the device 210 to be lubricated; as Figure 4 As shown, in the second working position, inlet 181 is connected to both the first outlet 182 and the second outlet 183. A portion of the oil flows to the first oil passage 12 to lubricate the device 210 to be lubricated, and another portion flows to the second oil passage 14 to cool the device 220 to be cooled; Figure 5 As shown, in the third working position, the inlet 181 is connected to the second outlet 183, and all the oil flows to the second oil passage 14 to cool the device 220 to be cooled.

[0061] The opening degree of the switching valve 18 can be adjusted according to the oil demand of the first oil circuit 12 and the second oil circuit 14 to meet the different oil demand of the electric drive system 200. For example, when the switching valve 18 is in the second working position, the oil demand in the first oil circuit 12 is greater than the oil demand in the second oil circuit 14, and the opening degree between the control inlet 181 and the first outlet 182 is greater than the opening degree between the control inlet 181 and the second outlet 183.

[0062] Please see Figure 1 In some embodiments, the cooling and lubrication system 100 includes a sensor 24 connected to the oil outlet of the pump body 16. The sensor 24 is used to detect the temperature of the oil output by the pump body 16. When the temperature of the oil is greater than a preset value, the oil cooler 20 is used to direct the oil output by the pump body 16 to the switching valve 18. When the temperature of the oil is less than or equal to the preset value, the switching valve 22 is used to direct the oil output by the pump body 16 to the switching valve 18.

[0063] Thus, the temperature of the oil can be detected by sensor 24, so that the flow path of the oil can be controlled according to the oil temperature to meet the usage requirements of the electric drive system 200.

[0064] For example, sensor 24 can be a temperature sensor such as a thermistor sensor or a thermocouple sensor.

[0065] Since the switching valve 22 and the oil cooler 20 are connected in parallel, the oil circuit connecting the switching valve 22 and the pump body 16, and the oil circuit connecting the oil cooler 20 and the pump body 16, can intersect at the oil outlet side of the pump body 16 to form a first intersection point. Similarly, the oil circuit connecting the switching valve 22 and the switching valve 18, and the oil circuit connecting the oil cooler 20 and the switching valve 18, can intersect at the inlet side of the switching valve 18 to form a second intersection point. The sensor 24 can be installed in the oil circuit between the first intersection point and the pump body 16, or in the oil circuit between the first intersection point and the switching valve 22, or in the oil circuit between the first intersection point and the oil cooler 20.

[0066] In some embodiments, the cooling and lubrication system 100 includes a controller electrically connected to the switching valve 18 and the on / off valve 22.

[0067] Thus, the controller can control the state of switching valve 18 and on / off valve 22 to control the flow of oil in the cooling and lubrication system 100.

[0068] For example, the switching valve 18 and the on / off valve 22 can be solenoid valves, and the controller electrically controls the switching valve 18 and the on / off valve 22. The controller can issue control commands to the switching valve 18 and the on / off valve 22 according to the status information of the vehicle 1000, so as to control the opening and closing degree of the switching valve 18 and the on / off valve 22 based on the control commands.

[0069] The status information of the vehicle 1000 includes the current temperature, speed, torque, etc. of the motor 221. The controller can determine the temperature, operating speed, torque, etc. of the motor 221 to confirm whether to control the switching valve 18 to close the second oil circuit 14. The controller can also determine whether to control the switching valve 22 to make the oil cooler 20 work based on the current temperature of the oil, so as to achieve the purpose of controlling the oil temperature as needed.

[0070] Please see Figure 1 In some embodiments, the cooling and lubrication system 100 includes a third oil passage 26, a throttling structure 28, and a return oil passage 30. The return oil passage 30 is connected to the device to be cooled 220. The third oil passage 26 is connected to the return oil passage 30 and the first oil passage 12. The throttling structure 28 is disposed in the third oil passage 26 and is used to guide a portion of the oil in the return oil passage 30 to the first oil passage 12.

[0071] Thus, by setting the throttling structure 28, the oil cooling the device to be cooled 220 can be used to assist lubricate the device to be lubricated 210, thereby improving the efficiency of the device to be lubricated 210 and reducing the risk of damage to the device to be lubricated 210.

[0072] For example, the throttling structure 28 can be a throttling orifice or a throttling valve. By adjusting the size of the throttling orifice and the opening of the throttling valve, the amount of oil flowing to the first oil passage 12 can be controlled.

[0073] The return oil passage 30 can be connected to the oil pan 23 to guide the oil that has passed through the device to be cooled 220 into the oil pan 23, thereby realizing the recycling of the oil.

[0074] Please see Figure 1 In some embodiments, the cooling and lubrication system 100 includes a filter 32 disposed on the oil inlet side of the pump body 16, and the filter 32 is used to filter the oil.

[0075] Thus, impurities in the oil can be removed by the filter 32, reducing the damage caused by impurities to the lubricated device 210 and the cooled device 220, which helps to improve the service life of each component.

[0076] For example, filter 32 may include a coarse filter and a fine filter. The inlet of the coarse filter extends into the oil pan 23, and the outlet of the coarse filter is connected to the inlet of the fine filter via an oil passage. The outlet of the fine filter is connected to the inlet of the pump body 16 via an oil passage. The coarse filter can perform coarse filtration on the oil before it enters the pump body 16, that is, perform primary filtration on the oil drawn from the oil pan 23, for example, filtering out large particulate impurities. The fine filter performs secondary filtration on the oil after coarse filtration, for example, finely filtering out the fine impurities remaining in the oil after coarse filtration.

[0077] Please see Figure 1 In some embodiments, the cooling and lubrication system 100 includes a pump motor 34 connected to the pump body 16, and the pump motor 34 is used to drive the pump body 16 to work.

[0078] Thus, the pump motor 34 can provide power to the pump body 16, thereby driving the pump body 16 to draw oil from the oil pan 23. For example, the amount of oil drawn by the pump body 16 can be controlled by adjusting the rotational speed of the pump motor 34.

[0079] Please see Figure 1 The second aspect of this application provides an automobile 1000, including the cooling and lubrication system 100 and the electric drive system 200 described in the first aspect of this application. The electric drive system 200 includes a motor 221, a reducer 211 and a bearing 212. The motor 221 includes a stator 222 and a rotor 223. A first oil passage 12 is connected to the reducer 211 and the bearing 212, and a second oil passage 14 is connected to the stator 222 and the rotor 223 of the motor 221.

[0080] The automobile 1000 provided in this application embodiment reduces the number of parts in the cooling and lubrication system 100 and simplifies the structure of the cooling and lubrication system 100, thereby reducing the production cost of the automobile 1000.

[0081] For example, motor 221 can be a DC motor, an asynchronous motor, or a permanent magnet synchronous motor. Stator 222 is a fixed component of motor 221, and rotor 223 is rotatably disposed inside stator 222. Stator 222 mainly consists of an iron core and windings, used to generate a magnetic field to realize the conversion of electrical energy into mechanical energy. Rotor 223 mainly consists of an iron core and a shaft, used to realize the conversion of electrical energy into mechanical energy through the principle of electromagnetic induction, driving the load to rotate.

[0082] The reducer 211 can be a gear reducer, worm gear reducer, planetary gear reducer, etc. The bearing 212 includes, but is not limited to, the bearing 212 on the input shaft and output shaft of the reducer 211. A reducer 211 can have 2, 3, 4 or more bearings 212.

[0083] Please see Figure 1 In some embodiments, the electric drive system 200 is a distributed electric drive system, with multiple motors 221 and multiple reducers 211. The first oil circuit 12 is connected to multiple reducers 211 and bearings 212 respectively, and the second oil circuit 14 is connected to the stator 222 and rotor 223 of multiple motors 221 respectively.

[0084] In this way, the cooling and lubrication system 100 can cool and lubricate the stators 222 and rotors 223 of multiple motors 221 in the automobile 1000, as well as multiple reducers 211 and bearings 212, making the overall structure of the automobile 1000 compact, reducing the space occupied by the cooling and lubrication system 100, and helping to reduce the production cost of the automobile 1000.

[0085] For example, when there are two motors 221 and two reducers 211, the first oil circuit 12 is connected to the bearing 212 and the two reducers 211 respectively, and the second oil circuit 14 is connected to the stator 222 and the rotor 223 of the two motors 221 respectively.

[0086] For example, when there are 3 motors 221 and 3 reducers 211, the first oil circuit 12 is connected to the bearing 212 and the 3 reducers 211 respectively, and the second oil circuit 14 is connected to the stator 222 and rotor 223 of the 3 motors 221 respectively.

[0087] For example, when there are 4 motors 221 and 4 reducers 211, the first oil circuit 12 is connected to the bearing 212 and the 4 reducers 211 respectively, and the second oil circuit 14 is connected to the stator 222 and rotor 223 of the 4 motors 221 respectively.

[0088] Regarding the operating modes of the electric drive system 200 of the vehicle 1000, the specific operating methods of the vehicle 1000 in different modes are explained in detail below:

[0089] During urban driving, the vehicle 1000 requires low driving power, and the output torque and speed of the electric drive system 200 are relatively low. At this time, the motor 221 does not require oil cooling due to low heat generation. By adjusting the switching valve 18 to the first working position (e.g., ... Figure 3 As shown), the second oil circuit 14 is closed, and only the reducer 211 and bearing 212 are lubricated. Specific implementation details are as follows: Figure 6 The controller receives the speed and torque requirements from the host computer and determines whether the working area is within the no-flow-requirement range of motor 221. Simultaneously, the motor temperature sensor transmits the current temperature of motor 221 to the controller. Based on the current motor temperature, operating speed, and torque, the controller determines whether to control the switching valve 18 to close the second oil circuit 14. Specifically, in urban traffic jams or during low-speed driving, the output speed and torque of the electric drive system 200 are relatively low. When adjusting the switching valve 18 to the first working position, to reduce the energy consumption of the pump body 16, it can be adjusted according to... Figure 7 As shown, the pump body 16 is intermittently given a speed command so that oil can be intermittently supplied to the reducer 211 and bearing 212 to meet their lubrication requirements.

[0090] When driving uphill or on highways, the power demand of vehicle 1000 is relatively high. Specifically, when vehicle 1000 is climbing a hill, the electric drive system 200 needs to output high torque; when vehicle 1000 is driving at high speed, it needs to output high speed. At this time, motor 221, reducer 211, and bearing 212 all require oil for cooling and lubrication. This is achieved by adjusting the switching valve 18 to the second working position (e.g., Figure 4 (As shown), the motor 221, reducer 211, and bearing 212 are cooled and lubricated. For detailed implementation methods, please refer to [reference needed]. Figure 8 The controller receives speed and torque requirements from the host computer and determines whether the operating area is within the required flow range. Simultaneously, the motor temperature sensor transmits the current temperature of motor 221 to the controller. Based on the current motor temperature, operating speed, and torque, the controller determines whether to control switching valve 18 to simultaneously open the first oil circuit 12 and the second oil circuit 14. Specifically, for certain special operating conditions where motor 221 needs rapid cooling to meet safety requirements or to reserve temperature for subsequent actions, the controller can adjust switching valve 18 to a third operating position (e.g., after the user issues a rapid cooling command or the system strategy issues a rapid cooling command) when a rapid cooling command is issued. Figure 5 As shown, all the oil is supplied to the motor 221 to achieve rapid cooling, thereby improving the safety of the vehicle or meeting certain special functional requirements.

[0091] In low-temperature environments, due to the low temperature of the electric drive system 200 and the high viscosity of the oil, sensor 24 can detect the oil temperature. The controller adjusts the state of the switching valve 22 according to the current oil temperature to reduce heat exchange in the oil, allowing the oil to heat up quickly and improving the efficiency of the electric drive system 200. Additionally, in low-temperature environments, if the heat generated by the electric drive system 200 is needed, such as for stall heating, the switching valve 22 can be adjusted to the closed state, allowing the heat in the oil to be exchanged to the water circuit through the oil cooler 20.

[0092] In both normal and high-temperature environments, the on / off state of the switching valve 22 can be actively adjusted by the oil temperature signal to improve efficiency. For example, in high-speed or WLTC (World Light Vehicle Test Cycle) / CLTC (China Light-duty Vehicle Test Cycle) conditions, in order to improve the efficiency of the electric drive system 200, the highest temperature point of the electric drive system 200 can be obtained and set as the opening temperature of the switching valve 22, so that the electric drive system 200 can always be kept in high-efficiency operation.

[0093] The above embodiments are merely preferred embodiments provided to fully illustrate this application, and the scope of protection of this application is not limited thereto. Equivalent substitutions or modifications made by those skilled in the art based on this application are all within the scope of protection of this application.

Claims

1. A cooling and lubricating system applied to an electric drive system of an automobile, characterized in that, The cooling lubrication system comprises: a first oil passage and a second oil passage, the first oil passage being configured to guide oil to a lubricated component, and the second oil passage being configured to guide oil to a cooled component; a pump body; a switching valve, an inlet of the switching valve being in communication with an oil outlet of the pump body, the switching valve comprising a first working position and a second working position, in the first working position, the switching valve being configured to guide oil output by the pump body to one of the first oil passage and the second oil passage, in the second working position, the switching valve being configured to guide oil output by the pump body to the first oil passage and the second oil passage, or to the other of the first oil passage and the second oil passage; an oil cooler, the oil cooler being arranged on an oil passage between the switching valve and the pump body; a switching valve, the switching valve being arranged on an oil passage between the switching valve and the pump body, and being arranged in parallel with the oil cooler.

2. The cooling and lubricating system according to claim 1, characterized in that The switching valve is one of a two-position three-way valve and a three-position three-way valve.

3. The cooling and lubricating system according to claim 1, characterized in that The switching valve comprises a third working position, in the first working position, the switching valve is configured to guide oil to the first oil passage; in the second working position, the switching valve is configured to guide oil to the first oil passage and the second oil passage; in the third working position, the switching valve is configured to guide oil to the second oil passage.

4. Cooling and lubricating system according to any one of claims 1-3, characterized in that The cooling lubrication system comprises a sensor, the sensor being connected to the oil outlet of the pump body, and the sensor being configured to detect a temperature of oil output by the pump body; in a case where the temperature of the oil is greater than a preset value, the oil cooler is configured to guide the oil output by the pump body to the switching valve; in a case where the temperature of the oil is less than or equal to the preset value, the switching valve is configured to guide the oil output by the pump body to the switching valve.

5. Cooling and lubricating system according to any one of claims 1-3, characterized in that The cooling lubrication system comprises a controller, the controller being electrically connected to the switching valve and the switching valve.

6. Cooling and lubricating system according to any of claims 1-3, characterized in that The cooling lubrication system comprises a third oil passage, a throttling structure and an oil return passage, the oil return passage being connected to the cooled component, the third oil passage being connected to the oil return passage and the first oil passage, and the throttling structure being arranged on the third oil passage, the throttling structure being configured to guide part of oil in the oil return passage to the first oil passage.

7. Cooling and lubricating system according to any of claims 1-3, characterized in that The cooling lubrication system comprises a filter, the filter being arranged on an oil inlet side of the pump body, and the filter being configured to filter oil.

8. Cooling and lubricating system according to any of claims 1-3, characterized in that The cooling lubrication system comprises a pump body motor, the pump body motor being connected to the pump body, and the pump body motor being configured to drive the pump body to work.

9. An automobile characterized by comprising: The cooling lubrication system comprises: the cooling lubrication system according to any one of claims 1-8; an electric drive system, the electric drive system comprising a motor, a speed reducer and a bearing, the motor comprising a stator and a rotor, the first oil passage being in communication with the speed reducer and the bearing, and the second oil passage being in communication with the stator and the rotor of the motor.

10. The automobile according to claim 9, characterized by The electric drive system is a distributed electric drive system, the motor and the speed reducer each being a plurality of, the first oil passage being in communication with a plurality of the speed reducers and the bearing respectively, and the second oil passage being in communication with a plurality of the stators and the rotors of the motor respectively.

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