An oil circuit system and a vehicle

Abstract

The application discloses an oil circuit system and a vehicle, and belongs to the technical field of vehicles. The oil circuit system comprises a first oil pump, a second oil pump, an oil supply tank and a first valve. A first pump shaft of the first oil pump is used for being in transmission connection with an output shaft of a driving motor. A second pump shaft of the second oil pump is used for being in transmission connection with a rotor of a generator. A first end of the first oil pump and a first end of the second oil pump are both in communication with the oil supply tank. The first valve has a first oil inlet end, a first oil outlet end and a second oil outlet end. The first oil inlet end is in communication with a second end of the first oil pump and a second end of the second oil pump. The first oil outlet end is used for being in communication with a first oil channel arranged in the driving motor. The second oil outlet end is used for being in communication with a second oil channel arranged in the generator. The oil circuit system is configured to control the on-off between the first oil inlet end and the first oil outlet end and / or the on-off between the first oil inlet end and the second oil outlet end.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to an oil circuit system and a vehicle. Background Technology

[0002] In related technologies, the oil circuit inside the generator and the oil circuit inside the drive motor are connected to the oil circuit system. The oil pump operates and drives the oil to circulate in the oil circuit system, the oil circuit inside the generator, and inside the drive motor, so as to cool and lubricate the generator and the drive motor.

[0003] Current fuel systems result in high vehicle energy consumption, fuel waste, and high costs. Summary of the Invention

[0004] This application provides a fuel system and a vehicle. It solves the problems of high vehicle energy consumption, fuel waste, and high cost caused by fuel systems in related technologies. The technical solution is as follows: On the one hand, an oil circuit system is provided, including: a first oil pump, a second oil pump, an oil supply tank, and a first valve; The first pump shaft of the first oil pump is used for transmission connection with the output shaft of the drive motor; The second pump shaft of the second oil pump is used for drive connection with the rotor of the generator; Both the first end of the first oil pump and the first end of the second oil pump are connected to the oil supply tank. The first valve has a first oil inlet, a first oil outlet, and a second oil outlet. The first oil inlet is connected to the second end of the first oil pump and to the second end of the second oil pump. The first oil outlet is used to connect to the first oil passage inside the drive motor, and the second oil outlet is used to connect to the second oil passage inside the generator. The oil circuit system is configured to: control the connection and disconnection between the first oil inlet end and the first oil outlet end, and / or control the connection and disconnection between the first oil inlet end and the second oil outlet end.

[0005] In some possible implementations, the oil circuit system is configured such that, driven by the drive motor during operation, the first oil pump pumps oil from the oil supply tank into the first oil inlet, then controls the first oil inlet and the first oil outlet to be connected, and controls the first oil inlet and the second oil outlet to be disconnected; or, driven by the generator during operation, the second oil pump pumps oil from the oil supply tank into the first oil inlet, then controls the first oil inlet and the second oil outlet to be connected, and controls the first oil inlet and the first oil outlet to be disconnected; or, driven by the drive motor and the generator during operation, the first oil pump and the second oil pump pump oil from the oil supply tank into the first oil inlet, then controls the first oil inlet and the first oil outlet to be connected, and controls the first oil inlet and the second oil outlet to be connected.

[0006] In some possible implementations, the oil circuit system further includes: an oil cooler and a second valve; Wherein, the oil inlet end of the oil cooler and the oil inlet end of the second valve are both connected to the second end of the first oil pump, and are also connected to the second end of the second oil pump; the oil outlet end of the oil cooler and the oil outlet end of the second valve are both connected to the first oil inlet end of the first valve. The oil circuit system is also configured to control the on / off connection between the oil inlet and outlet ends of the second valve.

[0007] In some possible implementations, the oil circuit system is further configured to: when the temperature of the oil in the oil supply tank is greater than or equal to the target temperature, control the disconnection between the oil inlet and outlet of the second valve, so that the oil in the oil supply tank is pumped into the first oil inlet after passing through the oil cooler under the driving action of the first oil pump and / or the second oil pump; when the temperature of the oil in the oil supply tank is less than the target temperature, control the connection between the oil inlet and outlet of the second valve, so that the oil in the oil supply tank is pumped into the first oil inlet after passing through the second valve under the driving action of the first oil pump and / or the second oil pump.

[0008] In some possible implementations, the oil circuit system further includes: an overflow valve; the oil inlet of the overflow valve is connected to the oil outlet of the oil cooler and to the oil outlet of the second valve; the oil outlet of the overflow valve is connected to the first end of the first oil pump and to the first end of the second oil pump.

[0009] In some possible implementations, the oil circuit system further includes: a first check valve; the oil inlet of the first check valve is connected to the second end of the first oil pump, the oil outlet of the first check valve is connected to the oil inlet of the oil cooler, and is also connected to the oil inlet of the second valve.

[0010] In some possible implementations, the oil circuit system further includes: a filter; the oil inlet of the filter is connected to the oil outlet of the oil supply tank, and the first end of the first oil pump and the first end of the second oil pump are both connected to the oil outlet of the filter.

[0011] In some possible implementations, the oil circuit system further includes: a second check valve; the oil inlet of the second check valve is connected to the first end of the first oil pump, and the oil outlet of the second check valve is connected to the second end of the first oil pump.

[0012] On the other hand, a vehicle is provided that integrates the aforementioned oil circuit system.

[0013] In some possible implementations, the vehicle is equipped with an electric drive assembly; the drive motor and generator in the vehicle, as well as the first oil pump, second oil pump, first valve and second valve in the oil circuit system are all integrated inside the electric drive assembly; the oil cooler in the oil circuit system is located outside the electric drive assembly.

[0014] The beneficial effects of the technical solutions provided in this application include at least the following: The first pump shaft of the first oil pump is used for transmission connection with the output shaft of the drive motor, and the second pump shaft of the second oil pump is used for transmission connection with the rotor of the generator. The first and second oil pumps can operate independently or simultaneously, depending on the operating conditions of the generator and drive motor. Compared to a large-displacement oil pump in the oil circuit system, the displacement of a single first or second oil pump is relatively low, allowing for a smaller size. More importantly, the outlets of both the first and second oil pumps are connected to the first inlet. By controlling the connection or disconnection between the first inlet and the first outlet, and between the first inlet and the second outlet, flexible switching between the first and second oil passages can be achieved, ensuring that the oil supply always adapts to the actual oil demand under different operating conditions of the generator and drive motor. When the generator and drive motor are operating simultaneously, the first and second oil pumps operate simultaneously, increasing the flow rate sufficiently. The oil circuit system supplies oil to both the first and second oil passages, ensuring the oil supply to both the generator and drive motor. The system provides lubrication and cooling for the engine. When only the drive motor is running, the first oil pump operates, and the oil circuit system can supply oil only to the first oil passage, avoiding oil waste and flow loss caused by oil entering the second oil passage, and avoiding power consumption waste caused by the operation of the second oil pump. When only the generator is running, the oil circuit system can supply oil only to the second oil passage, avoiding oil waste and flow loss caused by oil entering the first oil passage, and avoiding power consumption waste caused by the operation of the first oil pump. This effectively controls the amount of oil used and the power consumption, taking into account the stability of oil supply and energy economy under different operating conditions, effectively improving the utilization efficiency of the oil circuit system and reducing costs. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of an oil circuit system provided in an embodiment of this application.

[0017] Figure 2 This is a schematic diagram of the oil path of an oil circuit system provided in an embodiment of this application (only the drive motor is working).

[0018] Figure 3 This is a schematic diagram of the oil path of an oil circuit system provided in an embodiment of this application (only the generator is working).

[0019] Figure 4 This is a schematic diagram of the oil path of an oil circuit system provided in an embodiment of this application (the drive motor and generator work simultaneously).

[0020] Figure 5 This is a schematic diagram of another oil circuit system provided in an embodiment of this application.

[0021] Figure 6 This is a schematic diagram of the oil path of another oil circuit system provided in the embodiment of this application (only the drive motor is working and the second valve is closed).

[0022] Figure 7 This is a schematic diagram of the oil path of another oil circuit system provided in the embodiment of this application (only the generator is working and the second valve is closed).

[0023] Figure 8 This is a schematic diagram of the oil path of another oil circuit system provided in this application embodiment (the drive motor and generator work simultaneously, and the second valve is closed).

[0024] Figure 9 This is a schematic diagram of the oil path of another oil circuit system provided in the embodiment of this application (only the drive motor is working and the second valve is open).

[0025] Figure 10 This is a schematic diagram of the oil path of another oil circuit system provided in the embodiment of this application (only the generator is working and the second valve is open).

[0026] Figure 11 This is a schematic diagram of the oil path of another oil circuit system provided in this application embodiment (the drive motor and generator work simultaneously, and the second valve is open).

[0027] Figure 12 This is a schematic diagram of the oil path of another oil circuit system provided in the embodiments of this application (the drive motor and generator work simultaneously, and the overflow valve is open).

[0028] Figure 13 This is a schematic diagram of the oil path of another oil circuit system provided in the embodiments of this application (drive motor reverses, vehicle reverses).

[0029] Figure label: 1. First oil pump; 101. First pump shaft; D11. First end of the first oil pump; D12. Second end of the first oil pump; 2. Second oil pump; 21. Second pump shaft; D21. First end of the second oil pump; D22. Second end of the second oil pump; 3. Oil supply tank; 4. First valve; 41. First oil inlet; 42. First oil outlet; 43. Second oil outlet; 5. Drive motor; 51. First oil passage; 6. Generator; 61. Second oil passage; 7. Oil cooler; 8. Second valve; 9. Overflow valve; 10. First check valve; 11. Filter; 12. Second check valve. Detailed Implementation

[0030] To make the objectives, technical solutions, and advantages of this application clearer, the embodiments of this application will be described in further detail below with reference to the accompanying drawings.

[0031] On one hand, embodiments of this application provide an oil circuit system. This oil circuit system can serve as a lubrication and cooling system in a vehicle. The vehicle can be a range-extended hybrid vehicle. Figure 1 This is a schematic diagram of an oil circuit system provided in an embodiment of this application. Figure 1 As shown, the oil circuit system may include: a first oil pump 1, a second oil pump 2, an oil supply tank 3, and a first valve 4.

[0032] The first pump shaft 101 of the first oil pump 1 is used for a transmission connection with the output shaft of the drive motor 5. Here, the first oil pump 1 is a mechanical pump, and the first pump shaft 101 refers to the rotating shaft of the first oil pump 1 used to receive drive torque. The core function of the drive motor 5 is to drive the vehicle. The output shaft of the drive motor 5 is used to drive the vehicle and also to drive the first pump shaft 101 to rotate. Exemplarily, the output shaft of the drive motor 5 can be connected to the first pump shaft 101 via a transmission gear or a transmission shaft.

[0033] The second pump shaft 21 of the second oil pump 2 is used for drive connection with the rotor of the generator 6. Here, the second oil pump 2 is a mechanical pump, and the second pump shaft 21 refers to the rotating shaft of the second oil pump 2 used to receive drive torque. The core function of the generator 6 is to generate electricity. The rotor of the generator 6 can be drively connected to the output shaft of the engine, and the engine can drive the generator 6 to generate electricity. While generating electricity, the rotor of the generator 6 also drives the second pump shaft 21 to rotate. Exemplarily, the rotor of the generator 6 can be drively connected to the second pump shaft 21 through a transmission gear or a transmission shaft.

[0034] Mechanical pumps do not require a control system and are directly driven by drive motor 5 and generator 6. Mechanical pumps have a small displacement, simple structure, and are reliable, and their operating cost is much lower than that of electric pumps.

[0035] The first end D11 of the first oil pump 1 and the first end D21 of the second oil pump 2 are both connected to the oil supply tank 3. Here, when the drive motor 5 rotates in the forward direction (the vehicle moves forward), the first end D11 of the first oil pump 1 is the oil inlet of the first oil pump 1, and the first end D21 of the second oil pump 2 is the oil inlet of the second oil pump 2. The oil supply tank 3 serves as a container for storing oil. The rotation of the first oil pump 1 can draw oil from the oil supply tank 3, and the rotation of the second oil pump 2 can also draw oil from the oil supply tank 3. Exemplarily, the oil supply tank 3 is an oil pan.

[0036] The first valve 4 may have a first oil inlet 41, a first oil outlet 42, and a second oil outlet 43. The first oil inlet 41 is connected to the second end D12 of the first oil pump 1 and to the second end D22 of the second oil pump 2. The first oil outlet 42 is used to connect to the first oil passage 51 provided inside the drive motor 5, and the second oil outlet 43 is used to connect to the second oil passage 61 provided inside the generator 6. Here, when the drive motor 5 rotates in the forward direction (the vehicle moves forward), the second end D12 of the first oil pump 1 is the oil outlet of the first oil pump 1. The second end D22 of the second oil pump 2 is the oil outlet of the second oil pump 2.

[0037] Here, the first oil passage 51 inside the drive motor 5 serves as a lubrication and cooling oil passage for the drive motor 5. Oil flowing through the first oil passage 51 lubricates the drive motor 5 itself, as well as the rotating shafts, bearings, gears, and other structures that cooperate with the drive motor 5. Similarly, the second oil passage 61 inside the generator 6 serves as a lubrication and cooling oil passage for the generator 6. Oil flowing through the second oil passage 61 lubricates the generator 6 itself, as well as the rotating shafts, bearings, gears, and other structures that cooperate with the generator 6.

[0038] Thus, when the drive motor 5 is working (i.e., the output shaft of the drive motor 5 rotates), the first pump shaft 101 of the first oil pump 1 rotates under the drive of the drive motor 5, and the first oil pump 1 draws oil from the oil supply tank 3. After passing through the first oil pump 1, the oil flows to the first valve 4. When the drive motor 5 stops working (i.e., the output shaft of the drive motor 5 does not rotate), the first pump shaft 101 of the first oil pump 1 does not rotate, and the first oil pump 1 does not pump oil to the first valve 4. When the generator 6 is working (i.e., the rotor of the generator 6 rotates), the second pump shaft 21 of the second oil pump 2 rotates under the drive of the generator 6, and the second oil pump 2 draws oil from the oil supply tank 3. After passing through the second oil pump 2, the oil flows to the first valve 4. When the generator 6 is not working (i.e., the rotor of the generator 6 does not rotate), the second pump shaft 21 of the second oil pump 2 does not rotate, and the second oil pump 2 does not pump oil to the first valve 4.

[0039] The oil circuit system is configured to: control the on / off connection between the first oil inlet 41 and the first oil outlet 42, and / or control the on / off connection between the first oil inlet 41 and the second oil outlet 43. For example, the first valve 4 can be a three-way flow valve, and the flow direction of the oil can be adjusted by adjusting the position of the valve core of the first valve 4.

[0040] Here, when the first oil inlet 41 and the first oil outlet 42 are connected, oil can enter the first oil passage 51 from the first valve 4 to lubricate and cool the drive motor 5. When the first oil inlet 41 and the first oil outlet 42 are disconnected, oil cannot enter the first oil passage 51 from the first valve 4, and the oil does not flow through the drive motor 5. When the first oil inlet 41 and the second oil outlet 43 are connected, oil can enter the second oil passage 61 from the first valve 4 to lubricate and cool the generator 6. When the first oil inlet 41 and the second oil outlet 43 are disconnected, oil cannot enter the second oil passage 61 from the first valve 4, and the oil does not flow through the generator 6.

[0041] For example, the first valve 4 is a solenoid valve of the electric drive assembly on the vehicle, and the first valve 4 can be electrically connected to the vehicle's motor controller. The motor controller is connected to the vehicle controller via a CAN bus. The motor controller receives control commands from the vehicle controller and drives the first valve 4 to operate according to the control commands, so as to control the on / off connection between the first oil inlet 41 and the first oil outlet 42, and / or control the on / off connection between the first oil inlet 41 and the second oil outlet 43.

[0042] In summary, the first pump shaft of the first oil pump is used for transmission connection with the output shaft of the drive motor, and the second pump shaft of the second oil pump is used for transmission connection with the rotor of the generator. The first and second oil pumps can operate independently or simultaneously, depending on the operating conditions of the generator and drive motor. Compared to a large-displacement oil pump in the oil circuit system, the displacement of a single first or second oil pump is relatively low, allowing for a smaller size. More importantly, the outlets of both the first and second oil pumps are connected to the first inlet. By controlling the connection or disconnection between the first inlet and the first outlet, and between the first inlet and the second outlet, flexible switching between the first and second oil passages can be achieved, ensuring that the oil supply always adapts to the actual oil demand under different operating conditions of the generator and drive motor. When the generator and drive motor are operating simultaneously, the first and second oil pumps operate simultaneously, increasing the flow rate sufficiently. The oil circuit system supplies oil to both the first and second oil passages, ensuring the oil supply to both the generator and drive motor. The system provides lubrication and cooling for the engine. When only the drive motor is running, the first oil pump operates, and the oil circuit system can supply oil only to the first oil passage, avoiding oil waste and flow loss caused by oil entering the second oil passage, and avoiding power consumption waste caused by the operation of the second oil pump. When only the generator is running, the oil circuit system can supply oil only to the second oil passage, avoiding oil waste and flow loss caused by oil entering the first oil passage, and avoiding power consumption waste caused by the operation of the first oil pump. This effectively controls the amount of oil used and the power consumption, taking into account the stability of oil supply and energy economy under different operating conditions, effectively improving the utilization efficiency of the oil circuit system and reducing costs.

[0043] Figure 2This is a schematic diagram of the oil path of an oil circuit system provided in an embodiment of this application (only the drive motor 5 is working). Figure 2 As shown, in one possible implementation, the oil circuit system is configured such that, driven by the drive motor 5 during operation, the first oil pump 1 pumps oil from the oil tank 3 into the first oil inlet 41, then controls the connection between the first oil inlet 41 and the first oil outlet 42, and controls the disconnection between the first oil inlet 41 and the second oil outlet 43. Here, during operation, the drive motor 5 rotates in the forward direction, meaning it has a tendency to propel the vehicle forward.

[0044] In this way, only the drive motor 5 is running (rotating in the forward direction) between the generator 6 and the drive motor 5, and only the first oil pump 1 is running while the second oil pump 2 is not rotating. This avoids energy loss caused by the operation of the second oil pump 2. By controlling the connection between the first oil inlet end 41 and the first oil outlet end 42, and controlling the disconnection between the first oil inlet end 41 and the second oil outlet end 43, the oil only flows through the first oil passage 51 and does not flow through the second oil passage 61. This avoids oil waste and flow loss caused by oil entering the second oil passage 61. Moreover, the oil is only driven by the first oil pump 1 and is not driven by the second oil pump 2. The power consumption of the oil circuit system only includes the power consumption of the first oil pump 1, and the second oil pump 2 has no power consumption, thus saving power consumption.

[0045] Figure 3 This is a schematic diagram of the oil path of an oil circuit system provided in an embodiment of this application (only generator 6 is working). Figure 3 As shown, in another possible implementation, driven by the generator 6 during operation, the oil in the oil supply tank 3 is pumped into the first oil inlet 41 by the second oil pump 2. Then, the first oil inlet 41 and the second oil outlet 43 are connected, and the connection between the first oil inlet 41 and the first oil outlet 42 is disconnected. Here, the generator 6 outputs electrical energy during operation.

[0046] In this way, only generator 6 is running between generator 6 and drive motor 5, and only the second oil pump 2 operates while the first oil pump 1 does not rotate. By controlling the disconnection between the first oil inlet end 41 and the first oil outlet end 42, and controlling the connection between the first oil inlet end 41 and the second oil outlet end 43, the oil flows only through the second oil passage 61 and not through the first oil passage 51. This avoids oil waste and flow loss caused by oil entering the first oil passage 51. Furthermore, the oil is driven only by the second oil pump 2 and not by the first oil pump 1. The power consumption of the oil circuit system only includes the power consumption of the second oil pump 2, and the first oil pump 1 has no power consumption, thus saving power consumption.

[0047] Figure 4 This is a schematic diagram of the oil path of an oil circuit system provided in an embodiment of this application (drive motor 5 and generator 6 operate simultaneously). Figure 4As shown, in another possible implementation, under the drive of the drive motor 5 and the generator 6, the oil in the oil supply tank 3 is pumped into the first oil inlet 41 by the first oil pump 1 and the second oil pump 2, and the first oil inlet 41 is connected to the first oil outlet 42, and the first oil inlet 41 is connected to the second oil outlet 43.

[0048] Thus, with both generator 6 and drive motor 5 operating, both first oil pump 1 and second oil pump 2 operate. The power consumption of the oil circuit system includes the power consumption of both first oil pump 1 and second oil pump 2, and the flow rate of the oil circuit system corresponds to the overall displacement of first oil pump 1 and second oil pump 2. By controlling the connection between the first oil inlet end 41 and the first oil outlet end 42, and by controlling the connection between the first oil inlet end 41 and the second oil outlet end 43, sufficient oil can be provided to both generator 6 and drive motor 5, ensuring lubrication and cooling effects.

[0049] In some embodiments, when the first valve 4 is in its initial state, the first oil outlet 42 of the first valve 4 is connected to the first oil passage 51, and the second oil outlet 43 of the first valve 4 is disconnected from the second oil passage 61. Here, the initial state is the normally open position of the first valve 4, which can also be referred to as the uncontrolled state of the first valve 4.

[0050] In this way, the first valve 4 is adapted to the condition where the drive motor 5 is working and the generator 6 is not working. This condition is particularly suitable for pure electric drive in urban areas, which is the most frequent operating condition for electric vehicles. The initial state of the first valve 4 is adapted to the most frequent operating condition of electric vehicles. The first valve 4 does not need to be controlled and therefore does not consume power, which helps to reduce the energy consumption of the oil circuit system and the electric drive assembly, thereby further improving the working efficiency of the oil circuit system and the electric drive assembly.

[0051] Figure 5 This is a schematic diagram of another oil circuit system provided in an embodiment of this application. For example... Figure 5 As shown, in some possible implementations, the oil circuit system also includes: an oil cooler 7 and a second valve 8. Here, the oil cooler 7 refers to an oil cooler, which has the function of cooling the oil.

[0052] The oil inlet of oil cooler 7 and the oil inlet of second valve 8 are both connected to the second end D12 of first oil pump 1 and to the second end D22 of second oil pump 2. The oil outlet of oil cooler 7 and the oil outlet of second valve 8 are both connected to the first oil inlet 41 of first valve 4. That is to say, oil cooler 7 and second valve 8 are connected in parallel, or oil cooler 7 and second valve 8 are located on two parallel branches.

[0053] The oil circuit system is also configured to control the on / off connection between the inlet and outlet ends of the second valve 8.

[0054] Here, after the second valve 8 is disconnected, the oil bypasses the second valve 8 and reaches the first inlet 41 of the first valve 4 only after passing through the oil cooler 7. After the second valve 8 is opened, part of the oil can reach the first inlet 41 of the first valve 4 only after passing through the oil cooler 7, and the other part of the oil can reach the first inlet 41 of the first valve 4 only after passing through the second valve 8. It can be understood that the oil can also bypass the oil cooler 7 and reach the first inlet 41 of the first valve 4 only after passing through the second valve 8.

[0055] In this way, by controlling the connection or disconnection between the oil inlet and outlet of the second valve 8, the flow of oil through the oil cooler 7 can be controlled, or the proportion of oil flowing through the oil cooler 7 can be controlled. By controlling the second valve 8, the oil flows through the oil cooler 7, ensuring that the oil is cooled in time when the vehicle is running at high power. The cooled oil carries away the large amount of heat generated by the drive motor 5 and / or generator 6, reducing the temperature of the drive motor 5 and / or generator 6, and ensuring reliable vehicle operation. Moreover, when the environment is at low or normal temperature, or when the vehicle is in the initial or short-term operating state, the oil temperature is low, and the oil does not need to pass through the oil cooler 7 to dissipate heat and avoid wasting heat. At this time, the oil inlet and outlet of the second valve 8 are connected, and the oil flows through the second valve 8, reducing the amount flowing through the oil cooler 7 or preventing the oil from flowing through the oil cooler 7 altogether. This avoids heat loss from the oil, achieves a rapid increase in oil temperature, ensures oil fluidity, and improves the operating efficiency of the oil circuit system and the vehicle.

[0056] Similarly, at extremely low temperatures, the fluidity of the oil is very poor, resulting in significant losses during flow. If the oil flows through the oil cooler 7 at this temperature, the drive motor 5 or generator 6 needs to provide substantial power to drive the first oil pump 1 or the second oil pump 2, leading to high power demands and wasted energy. By incorporating the second valve 8, the power demands of the first oil pump 1 and the second oil pump 2 can be reduced, thereby lowering the energy consumption of the oil system and the vehicle.

[0057] For example, the second valve 8 is a solenoid valve of the electric drive assembly on the vehicle, and the second valve 8 can be electrically connected to the vehicle's motor controller. The motor controller is connected to the vehicle controller via a CAN bus. The motor controller receives control commands from the vehicle controller and drives the second valve 8 to operate according to the control commands, so as to control the opening and closing between the oil inlet and outlet of the second valve 8.

[0058] For example, one end of the second valve 8 can be connected to the oil cooler 7 via a first pipeline, and the other end of the second valve 8 can be connected to the oil cooler 7 via a second pipeline. The oil cooler 7 can be connected to the first oil pump 1 via a third pipeline, and the oil cooler 7 can be connected to the second oil pump 2 via a fourth pipeline. It is understood that the first, second, third, and fourth pipelines can all be pipelines distributed on the housing of the electric drive assembly.

[0059] In some embodiments, after the second valve 8 is turned on, the oil resistance of the oil circuit where the second valve 8 is located is less than the oil resistance of the oil circuit where the oil cooler 7 is located. After the second valve 8 is turned on, most of the oil flows through the second valve 8.

[0060] Please refer to Figures 6-11 In some possible implementations, the oil circuit system is further configured such that: when the temperature of the oil in the oil supply tank 3 is greater than or equal to the target temperature, the inlet and outlet ends of the second valve 8 are disconnected, allowing the oil in the oil supply tank 3 to be pumped into the first inlet end 41 after passing through the oil cooler 7 under the drive of the first oil pump 1 and / or the second oil pump 2. When the temperature of the oil in the oil supply tank 3 is less than the target temperature, the inlet and outlet ends of the second valve 8 are connected, allowing the oil in the oil supply tank 3 to be pumped into the first inlet end 41 after passing through the second valve 8 under the drive of the first oil pump 1 and / or the second oil pump 2.

[0061] In this way, the direction of the oil circuit can be dynamically adjusted according to the actual temperature of the oil. When the oil temperature is low, the viscosity of the oil itself is high. By bypassing the oil cooler 7 through the second valve 8, the overall resistance of the oil circuit can be reduced, the driving power consumption of the first oil pump 1 and / or the second oil pump 2 can be reduced, and the oil heating rate can be accelerated, so that the electric drive assembly can reach the optimal operating temperature range more quickly and improve the working efficiency in low-temperature environments. When the oil temperature is higher than or equal to the target temperature, all the oil is allowed to pass through the oil cooler 7 for heat dissipation, which can effectively control the oil operating temperature and avoid the generator 6 and / or drive motor 5 from overheating due to high temperature. This effectively improves the working reliability and service life of the electric drive assembly and can adapt to the heat dissipation and temperature control requirements under different operating conditions.

[0062] For example, the target temperature can be in the range of 50°C to 70°C. Keeping the oil temperature below the target temperature ensures effective lubrication and cooling of the generator 6 and / or drive motor 5. For instance, the target temperature could be 60°C.

[0063] It should be noted that the oil temperature can be collected using a temperature sensor. The temperature sensor communicates with the vehicle controller via the motor controller, providing both the motor controller and the vehicle controller with the oil temperature data in the oil circuit. Based on the temperature data, the motor controller can control the opening or closing of the second valve 8.

[0064] Figure 6 This is a schematic diagram of the oil path of another oil circuit system provided in an embodiment of this application (only the drive motor 5 is working and the second valve 8 is closed). Figure 6 As shown, the drive motor 5 drives the first oil pump 1 to operate, the generator 6 stops, and the second oil pump 2 stops. Only the first oil pump 1 draws oil from the oil supply tank 3. After the oil output from the oil supply tank 3 is pumped out by the first oil pump 1, the oil cannot flow directly to the first oil inlet 41 through the second valve 8 because the second valve 8 is in the open state. Therefore, all the oil will enter the oil cooler 7 to complete heat exchange and cooling. The cooled oil then enters the first oil inlet 41 of the first valve 4. The first oil inlet 41 of the first valve 4 is connected to the first oil outlet 42, and the first oil inlet 41 of the first valve 4 is disconnected from the second oil outlet 43. The oil only enters the first oil passage 51 after passing through the first valve 4. After completing the cooling oil supply for the drive motor 5, the oil flows back to the oil supply tank 3 from the return oil end of the drive motor 5, forming a complete cooling oil supply cycle. This oil supply path can quickly reduce the oil temperature when the oil temperature is too high and the drive motor 5 has high power, ensuring that the drive motor 5 always operates within a suitable temperature range and effectively improving the stability of the drive motor 5 under long-term working conditions.

[0065] Figure 7 This is a schematic diagram of the oil path of another oil circuit system provided in an embodiment of this application (only generator 6 is working and second valve 8 is closed). Figure 7 As shown, the solid black arrows in the dashed lines represent the oil path. When generator 6 operates, it drives the second oil pump 2 to operate, while drive motor 5 stops. The first oil pump 1 stops, and only the second oil pump 2 draws oil from the oil supply tank 3. After the oil output from the oil supply tank 3 is pumped out by the second oil pump 2, the oil cannot flow directly to the first oil inlet 41 through the second valve 8 because the second valve 8 is in the open state. Therefore, all the oil enters the oil cooler 7 to complete heat exchange and cooling. The cooled oil then enters the first oil inlet 41 of the first valve 4. The first oil inlet 41 of the first valve 4 is connected to the second oil outlet 43, and the first oil inlet 41 of the first valve 4 is disconnected from the first oil outlet 42. The oil only enters the second oil passage 61 after passing through the first valve 4, completing the cooling oil supply to generator 6. After that, the oil flows back to the oil supply tank 3 from the return oil end of generator 6, forming a complete cooling oil supply cycle. This oil supply path can quickly reduce the oil temperature when the oil temperature is too high and the generator 6 has a high power output, ensuring that the generator 6 always operates within a suitable temperature range and effectively improving the stability of the vehicle under long-term power generation conditions.

[0066] Figure 8 This is a schematic diagram of the oil path of another oil circuit system provided in an embodiment of this application (drive motor 5 and generator 6 work simultaneously, and second valve 8 is closed). Figure 8As shown, the solid black arrows in the dashed lines represent the oil path. The drive motor 5 drives the first oil pump 1, and the generator 6 drives the second oil pump 2. Both pumps simultaneously draw oil from the oil supply tank 3. After being pumped out by the first and second pumps, the oil from the oil supply tank 3 cannot flow directly to the first inlet 41 through the second valve 8, which is in the open state. Therefore, all the oil enters the oil cooler 7 for heat exchange and cooling. The cooled oil then converges and enters the first inlet 41 of the first valve 4. The first inlet 41 of the first valve 4 is kept connected to both the first outlet 42 and the second outlet 43. After passing through the first valve 4, the oil simultaneously enters the first oil passage 51 and the second oil passage 61, respectively supplying cooling oil to the drive motor 5 and the generator 6. Finally, the oil flows back to the oil supply tank 3 from the return ends of the drive motor 5 and the generator 6, forming a complete high-flow-rate cooling oil supply cycle. This oil supply path can quickly dissipate the heat generated by the operation of both the drive motor 5 and the generator 6 when the oil temperature is high and the overall power of the drive motor 5 and the generator 6 is high, thus ensuring the reliability and stability of the generator 6 and the drive motor 5 under long-term operation.

[0067] Figure 9 This is a schematic diagram of the oil path of another oil circuit system provided in an embodiment of this application (only the drive motor 5 is working and the second valve 8 is open). Figure 9 As shown, the solid black arrows in the dashed lines represent the oil path. When the drive motor 5 operates, it drives the first oil pump 1, while the generator 6 and the second oil pump 2 stop. Only the first oil pump 1 draws oil from the oil supply tank 3. The oil output from the oil supply tank 3, after being pumped out by the first oil pump 1, flows directly to the first oil inlet 41 through the second valve 8, without needing to pass entirely through the oil cooler 7, or even bypassing it entirely. The low-temperature oil directly enters the first oil inlet 41 of the first valve 4, achieving a warm-up function. The control system connects the first oil inlet 41 to the first oil outlet 42 of the first valve 4 and disconnects it from the second oil outlet 43. The oil then enters only the first oil passage 51 through the first valve 4, completing the cooling oil supply to the drive motor 5. After this, the oil flows back to the oil supply tank 3 from the return end of the drive motor 5, forming a complete cooling oil supply cycle. This oil supply path can prevent unnecessary heat loss of the oil in the oil cooler 7 when the oil temperature is low, promote the rapid heating of the oil to the appropriate working temperature, improve the fluidity of the oil in low temperature environment, reduce the drive power loss of the first oil pump 1, and effectively improve the vehicle's economy under low temperature conditions when only the drive motor 5 is working.

[0068] In winter, the initial temperature of the fluid is low, the ambient temperature is low, and urban commuter vehicles travel at low speeds and over short distances. If using... Figure 6Under the corresponding operating conditions, the oil cooler 7 dissipates heat, resulting in significant heat loss and slow oil temperature rise, thus keeping the efficiency of the electric drive assembly at a consistently low level. If... Figure 9 Under the corresponding operating conditions, the oil flow is controlled to be minimal or nonexistent through the oil cooler 7, resulting in a rapid increase in oil temperature and improved vehicle driving efficiency, leading to significant advantages in vehicle energy consumption. Therefore, this oil circuit system corresponds to... Figure 9 Its advantages are even more pronounced in winter.

[0069] Figure 10 This is a schematic diagram of the oil path of another oil circuit system provided in an embodiment of this application (only generator 6 is working and second valve 8 is open). Figure 10 As shown, the solid black arrows in the dashed lines represent the oil path. When generator 6 operates, it drives the second oil pump 2, while drive motor 5 stops. The first oil pump 1 also stops, and only the second oil pump 2 draws oil from the oil supply tank 3. After being pumped out by the second oil pump 2, the oil from the oil supply tank 3 flows directly to the first inlet end 41 of the first valve 4 through the second valve 8, without needing to pass entirely through the oil cooler 7. In fact, it can even bypass the oil cooler 7 entirely, allowing the low-temperature oil to directly enter the first inlet end 41. This controls the first inlet end 41 of the first valve 4 to be connected to the second outlet end 43, and disconnects the first inlet end 41 from the first outlet end 42. The oil then enters only the second oil passage 61 after passing through the first valve 4, completing the cooling oil supply to generator 6. Afterward, the oil flows back to the oil supply tank 3 from the return end of generator 6, forming a complete cooling oil supply cycle under this operating condition. This oil supply path can prevent unnecessary heat loss of the oil in the oil cooler 7 when the oil temperature is low, promote the rapid heating of the oil to the appropriate operating temperature, improve the fluidity of the oil in low-temperature environments, reduce the drive power loss of the second oil pump 2, and effectively improve the vehicle's economy under low-temperature conditions when only the generator 6 is working.

[0070] Figure 11 This is a schematic diagram of the oil path of another oil circuit system provided in an embodiment of this application (drive motor 5 and generator 6 work simultaneously, and the second valve 8 is open). Figure 11As shown, the solid black arrows in the dashed lines represent the oil path. The drive motor 5 drives the first oil pump 1, and the generator 6 drives the second oil pump 2. Both pumps simultaneously draw oil from the oil supply tank 3. The oil output from the oil supply tank 3 is pumped out by the first and second pumps. Since the second valve 8 is in the open state, the oil can flow directly to the first inlet end 41 of the first valve 4, without needing to pass entirely through the oil cooler 7, or even bypassing it entirely. The low-temperature oil directly enters the first inlet end 41. The first inlet end 41 of the first valve 4 is kept open with both the first outlet end 42 and the second outlet end 43. After passing through the first valve 4, the oil simultaneously enters the first oil passage 51 and the second oil passage 61, respectively supplying cooling oil to the drive motor 5 and the generator 6. The oil then flows back to the oil supply tank 3 from the return ends of the drive motor 5 and the generator 6, forming a complete high-flow-rate cooling oil supply cycle. This oil supply path can prevent unnecessary heat loss of the oil in the oil cooler 7 when the oil temperature is low and the overall power of the drive motor 5 and generator 6 is low, promote the rapid heating of the oil to a suitable operating temperature, improve the fluidity of the oil in low-temperature environments, reduce the overall drive power loss of the first oil pump 1 and the second oil pump 2, and effectively improve the vehicle's economy under low-temperature conditions when the generator 6 and drive motor 5 work simultaneously.

[0071] Figure 12 This is a schematic diagram of the oil path in another oil circuit system provided in this application embodiment (drive motor 5 and generator 6 work simultaneously, overflow valve 9 is open). Figure 5 and Figure 12 As shown, in some possible implementations, the oil circuit system may further include: a relief valve 9. The oil inlet of the relief valve 9 is connected to the oil outlet of the oil cooler 7 and to the oil outlet of the second valve 8. The oil outlet of the relief valve 9 is connected to the first end D11 of the first oil pump 1 and to the first end D21 of the second oil pump 2. Exemplarily, the relief valve 9 may be a pressure control valve for regulating oil pressure and releasing excess flow, which can automatically open when the oil circuit system has excess flow and the oil pressure rises to a preset threshold.

[0072] like Figure 12 As shown, the solid black arrows in the dashed lines represent the oil path. When the vehicle speed is high, the drive motor 5 and generator 6 can rotate at a higher speed, resulting in a larger overall displacement of the first oil pump 1 and the second oil pump 2. This leads to higher flow and pressure in the oil circuit system. When the flow or pressure in the oil circuit system increases to the opening threshold of the overflow valve 9, the overflow valve 9 automatically opens. At this time, in addition to flowing from the oil cooler 7 or the second valve 8 to the first valve 4, the oil can also flow back from the overflow valve 9 to the oil inlet of the first oil pump 1 and the oil inlet of the second oil pump 2, thus realizing the recycling of the oil.

[0073] like Figure 5As shown, in some possible implementations, the oil circuit system may further include: a first check valve 10. The oil inlet of the first check valve 10 is connected to the second end D12 of the first oil pump 1, the oil outlet of the first check valve 10 is connected to the oil inlet of the oil cooler 7, and is also connected to the oil inlet of the second valve 8.

[0074] Here, the first check valve 10 has the functions of unidirectional flow guidance and reverse disconnection. Under the action of the first check valve 10, oil can flow from the oil outlet of the first oil pump 1 to the first check valve 10, and from the first check valve 10 to the oil cooler 7 or the second valve 8. Conversely, due to the reverse disconnection of the first check valve 10, oil cannot flow from the second valve 8 or the oil cooler 7 to the oil outlet of the first oil pump 1. In this way, when the vehicle is reversing, the drive motor 5 reverses, and the first check valve 10 can effectively prevent the first oil pump 1 from sucking oil from the first oil passage 51 or the second oil passage 61, which would cause lubrication or cooling failure of the drive motor 5 or the generator 6, thus ensuring reliable vehicle operation.

[0075] like Figure 5 As shown, in some possible implementations, the oil circuit system may further include: a filter 11. The oil inlet of the filter 11 is connected to the oil outlet of the oil supply tank 3, and the first end D11 of the first oil pump 1 and the first end D21 of the second oil pump 2 are both connected to the oil outlet of the filter 11.

[0076] The oil in the oil tank 3 first flows through the filter 11, which filters out impurities from the oil to obtain clean oil. Then, the oil flows out of the filter 11 and flows to the first oil pump 1 and / or the second oil pump 2.

[0077] In this way, by arranging a filter 11 upstream of the first oil pump 1 and the second oil pump 2, the clean oil helps to reduce the wear of the rotor of the first oil pump 1 and the rotor of the second oil pump 2, and prevents the rotor of the first oil pump 1 and the rotor of the second oil pump 2 from jamming, thereby improving the operational reliability of the first oil pump 1 and the second oil pump 2. At the same time, the clean oil can ensure the cleanliness of the second oil passage 61 and the first oil passage 51, and avoid damage to the generator 6 or the drive motor 5.

[0078] In some embodiments, the filter 11 has a medium precision, which is 40µm to 90µm. For example, it can be 60µm to 80µm. Compared to a fine filter, the medium precision filter 11 has a lower precision and can reduce the oil suction resistance of the first oil pump 1 and the second oil pump 2 while meeting the filtration requirements, thereby reducing oil flow loss and the load on the first oil pump 1 and / or the second oil pump 2.

[0079] Figure 13 This is a schematic diagram of the oil path of another oil circuit system provided in the embodiments of this application (drive motor 5 reverses, vehicle reverses). Figure 5 and Figure 13 As shown, in some possible implementations, the oil circuit system may further include a second check valve 12. The inlet end of the second check valve 12 is connected to the first end D11 of the first oil pump 1, and the outlet end of the second check valve 12 is connected to the second end D12 of the first oil pump 1. Here, the second check valve 12 has the functions of unidirectional flow guidance and reverse disconnection.

[0080] like Figure 13 As shown, the solid black arrows in the dashed lines represent the oil path. When the vehicle is reversing, the drive motor 5 reverses, and the first end D11 of the first oil pump 1 becomes the oil outlet of the first oil pump 1, while the second end D12 of the first oil pump 1 becomes the oil inlet of the first oil pump 1. The second check valve 12 can form the oil circuit circulation shown in the diagram with the first oil pump 1. The circulation method is as follows: the oil flows from the first end D11 of the first oil pump 1 to the oil inlet of the first check valve 10, then from the oil outlet of the first check valve 10 to the second end D12 of the first oil pump 1, and finally from the second end D12 of the first oil pump 1 back to the first end D11 of the first oil pump 1.

[0081] Thus, during the reverse rotation of the drive motor 5, the first end D11 of the first oil pump 1 is also connected to the second end D12 of the first oil pump 1 through the second check valve 12; when the drive motor 5 rotates forward, the second check valve 12 is disconnected. This prevents the first oil pump 1 from running dry and being damaged when the drive motor 5 rotates in reverse.

[0082] It is understandable that the first check valve 10 and the second check valve 12 can be arranged simultaneously in the oil circuit system. This allows the first oil pump 1 to interact with the second check valve 12 when the drive motor 5 is in reverse operation. Figure 13 The localized circulation shown ensures that the first oil pump 1 is not unloaded. At the same time, the first check valve 10 can reverse the connection between the first oil pump 1 and the oil cooler 7 or the second valve 8, preventing the first oil pump 1 from drawing oil from the first oil passage 51 or the second oil passage 61, thereby ensuring the cooling and lubrication of the generator 6 and the drive motor 5.

[0083] On the other hand, embodiments of this application provide a vehicle that integrates the aforementioned oil circuit system. The vehicle can be a range-extended hybrid vehicle.

[0084] By adopting the above-mentioned oil circuit system, the vehicle can reasonably control and distribute the flow of the oil circuit system under various combined operating conditions of the drive motor 5 and the generator 6. This can not only meet the cooling and lubrication requirements of the drive motor 5 and the generator 6 under different operating conditions, but also reduce unnecessary power loss of the vehicle, reduce oil waste and flow waste in some operating conditions, and reduce the displacement and volume of a single oil pump.

[0085] In some possible implementations, an electric drive assembly is located inside the vehicle. For example, an electric drive assembly refers to an integrated powertrain that includes a drive motor 5, a generator 6, a range extender, and a transmission.

[0086] The drive motor 5 and generator 6 in the vehicle, as well as the first oil pump 1, second oil pump 2, first valve 4, and second valve 8 in the oil circuit system, are all integrated inside the electric drive assembly. The oil cooler 7 in the oil circuit system is located outside the electric drive assembly.

[0087] In this way, the first oil pump 1, the second oil pump 2, the first valve 4, and the second valve 8 are all integrated inside the electric drive assembly, while the oil cooler 7 in the oil circuit system is located outside the electric drive assembly. Under low-temperature conditions, the oil can flow only through the second valve 8 and not through the oil cooler 7. The oil circulates only inside the electric drive assembly, minimizing heat loss and allowing for rapid heating. Oil viscosity is inversely related to temperature; that is, the higher the temperature, the lower the oil viscosity. Lower viscosity results in better oil flow and less loss during flow. Therefore, the load on the first oil pump 1 and / or the second oil pump 2 is smaller, requiring less drive power, thus improving the drive efficiency of the first oil pump 1 and the second oil pump 2.

[0088] Meanwhile, the large gear in a differential, which typically has a large outer diameter and is located at a lower position in the electric drive assembly, is immersed in the oil. During operation, it continuously churns the oil, resulting in churning losses. Lower oil viscosity reduces these churning losses, thus improving the efficiency of the hydraulic system and the electric drive assembly.

[0089] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The term "multiple" refers to two or more unless otherwise expressly defined.

[0090] The above description is merely an optional embodiment of this application and is not intended to limit this application. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An oil circuit system, characterized in that, include: First oil pump (1), second oil pump (2), oil supply tank (3) and first valve (4); The first pump shaft (101) of the first oil pump (1) is used for transmission connection with the output shaft of the drive motor (5); The second pump shaft (21) of the second oil pump (2) is used for rotor drive connection with the generator (6); The first end of the first oil pump (1) and the first end of the second oil pump (2) are both connected to the oil supply tank (3); The first valve (4) has a first oil inlet (41), a first oil outlet (42), and a second oil outlet (43). The first oil inlet (41) is connected to the second end of the first oil pump (1) and to the second end of the second oil pump (2). The first oil outlet (42) is used to connect to the first oil passage (51) provided inside the drive motor (5). The second oil outlet (43) is used to connect to the second oil passage (61) provided inside the generator (6). The oil circuit system is configured to: control the connection and disconnection between the first oil inlet end (41) and the first oil outlet end (42), and / or control the connection and disconnection between the first oil inlet end (41) and the second oil outlet end (43).

2. The oil circuit system according to claim 1, characterized in that, The oil circuit system is configured such that, under the drive of the drive motor (5) during operation, the first oil pump (1) pumps the oil in the oil supply tank (3) into the first oil inlet (41), and then controls the first oil inlet (41) and the first oil outlet (42) to be connected, and controls the first oil inlet (41) and the second oil outlet (43) to be disconnected; or, under the drive of the generator (6) during operation, the second oil pump (2) pumps the oil in the oil supply tank (3) into the first oil inlet (41), and then controls the first oil outlet (42) to be connected. The first oil inlet (41) is connected to the second oil outlet (43), and the first oil inlet (41) is disconnected from the first oil outlet (42); or, under the drive of the drive motor (5) and the generator (6) during operation, the oil in the oil supply tank (3) is pumped into the first oil inlet (41) by the first oil pump (1) and the second oil pump (2), and the first oil inlet (41) is connected to the first oil outlet (42), and the first oil inlet (41) is connected to the second oil outlet (43).

3. The oil circuit system according to claim 1, characterized in that, The oil circuit system also includes: an oil cooler (7) and a second valve (8); The oil inlet of the oil cooler (7) and the oil inlet of the second valve (8) are both connected to the second end of the first oil pump (1) and to the second end of the second oil pump (2); the oil outlet of the oil cooler (7) and the oil outlet of the second valve (8) are both connected to the first oil inlet (41) of the first valve (4). The oil circuit system is also configured to control the on / off connection between the oil inlet and oil outlet of the second valve (8).

4. The oil circuit system according to claim 3, characterized in that, The oil circuit system is further configured to: when the temperature of the oil in the oil supply tank (3) is greater than or equal to the target temperature, control the disconnection between the oil inlet and outlet of the second valve (8), so that the oil in the oil supply tank (3) is pumped into the first oil inlet (41) after passing through the oil cooler (7) under the driving action of the first oil pump (1) and / or the second oil pump (2); when the temperature of the oil in the oil supply tank (3) is less than the target temperature, control the connection between the oil inlet and outlet of the second valve (8), so that the oil in the oil supply tank (3) is pumped into the first oil inlet (41) after passing through the second valve (8) under the driving action of the first oil pump (1) and / or the second oil pump (2).

5. The oil circuit system according to claim 3, characterized in that, The oil circuit system further includes: an overflow valve (9); the oil inlet of the overflow valve (9) is connected to the oil outlet of the oil cooler (7) and to the oil outlet of the second valve (8); the oil outlet of the overflow valve (9) is connected to the first end of the first oil pump (1) and to the first end of the second oil pump (2).

6. The oil circuit system according to claim 3, characterized in that, The oil circuit system further includes: a first check valve (10); the oil inlet of the first check valve (10) is connected to the second end of the first oil pump (1), the oil outlet of the first check valve (10) is connected to the oil inlet of the oil cooler (7), and is connected to the oil inlet of the second valve (8).

7. The oil circuit system according to any one of claims 1-6, characterized in that, The oil circuit system further includes: a filter (11); the oil inlet of the filter (11) is connected to the oil outlet of the oil supply tank (3), and the first end of the first oil pump (1) and the first end of the second oil pump (2) are both connected to the oil outlet of the filter (11).

8. The oil circuit system according to any one of claims 1-6, characterized in that, The oil circuit system further includes: a second check valve (12); the oil inlet of the second check valve (12) is connected to the first end of the first oil pump (1), and the oil outlet of the second check valve (12) is connected to the second end of the first oil pump (1).

9. A vehicle, characterized in that, The vehicle is equipped with the oil circuit system according to any one of claims 1-8.

10. The vehicle according to claim 9, characterized in that, The vehicle is equipped with an electric drive assembly; the drive motor (5) and generator (6) in the vehicle, as well as the first oil pump (1), second oil pump (2), first valve (4) and second valve (8) in the oil circuit system are all integrated inside the electric drive assembly; the oil cooler (7) in the oil circuit system is located outside the electric drive assembly.

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