Automotive hydraulics and hybrid vehicles

Abstract

The present application relates to an automobile hydraulic system and a hybrid vehicle, and belongs to the field of hydraulic transmission technology. The automobile hydraulic system includes a control unit, an oil supply unit, an electric pump, a mechanical pump, an electromagnetic pilot valve, a pressure regulating valve, a second one-way valve, a protection unit, a generator cooling valve, an electric motor oil supply port, a generator oil supply port and a direct-drive pressure control valve; the control unit controls the electromagnetic pilot valve and the direct-drive pressure control valve to be in a closed state, or controls the electromagnetic pilot valve to be in a first opening and controls the direct-drive pressure control valve to be in a closed state, or controls the electromagnetic pilot valve to be in a second opening and controls the direct-drive pressure control valve to be in an open state. By adopting the present application, the energy utilization rate of the automobile hydraulic system can be improved.

Description

Technical Field

[0001] The present application relates to the technical field of automobile hydraulic transmission, and in particular to an automobile hydraulic system and a hybrid electric vehicle. Background Art

[0002] Nowadays, new energy vehicles are gradually becoming the mainstream choice of automobiles, among which hybrid vehicles are gradually favored by the market for their superior energy-saving and emission-reduction performance and excellent user experience. In hybrid vehicles, the hydraulic system is one of the most critical components.

[0003] The current automotive hydraulic system is connected to the motor, generator and actuator of the hybrid vehicle. When any of the motor, generator or actuator has a demand for oil, the automotive hydraulic system will deliver oil to the motor, generator and actuator at the same time.

[0004] However, in different driving modes of hybrid vehicles, not all components have oil requirements. For example, in pure electric mode, only the electric motor in the hybrid vehicle needs oil for cooling and lubrication, while the generator and actuator do not need oil. If the vehicle hydraulic system delivers oil to the electric motor, generator and actuator at this time, it will cause a lot of energy waste. Summary of the invention

[0005] The embodiments of the present application provide an automobile hydraulic system and a hybrid electric vehicle, which can solve the technical problems existing in the related technologies. The technical solutions are as follows:

[0006] In a first aspect, an embodiment of the present application provides an automobile hydraulic system, which is applied to a hybrid vehicle, and includes a control unit, an oil supply unit, an electric pump, a mechanical pump, a first one-way valve, an electromagnetic pilot valve, a pressure regulating valve, a second one-way valve, a protection unit, a generator cooling valve, a motor oil supply port, a generator oil supply port, and a direct-drive pressure control valve, wherein the pressure regulating valve has a first oil control port, a second oil control port, a first oil inlet, a first oil outlet, a second oil inlet, and a second oil outlet, and the generator cooling valve has a third oil inlet and a third oil outlet;

[0007] The oil inlet of the oil supply unit is communicated with the oil outlet of the motor and the oil outlet of the generator respectively, the electric pump is electrically connected to the battery of the hybrid vehicle, when the motor of the hybrid vehicle rotates, the electric pump is in an on state, and the mechanical pump is drivingly connected to the output shaft of the engine of the hybrid vehicle;

[0008] The oil inlet of the electric pump is communicated with the oil outlet of the oil supply unit, the oil inlet of the mechanical pump is communicated with the oil outlet of the oil supply unit, the oil inlet of the first one-way valve is communicated with the oil outlet of the electric pump, the oil inlet of the solenoid pilot valve is communicated with the oil outlet of the mechanical pump, the oil outlet of the solenoid pilot valve is respectively communicated with the oil control port of the solenoid pilot valve, the first oil control port of the pressure regulating valve, and the oil control port of the generator cooling valve, the first oil inlet is communicated with the oil outlet of the mechanical pump, the second oil inlet is communicated with the oil outlet of the mechanical pump, the second oil outlet is communicated with the oil inlet of the mechanical pump, the second oil control port of the pressure regulating valve is communicated with the oil control port of the mechanical pump The oil outlet of the second one-way valve is communicated with the oil inlet of the second one-way valve is communicated with the first oil outlet, the oil inlet of the protection unit is communicated with the oil outlet of the first one-way valve and the oil outlet of the second one-way valve respectively, the third oil inlet of the generator cooling valve is communicated with the oil outlet of the protection unit, the motor oil supply port is communicated with the oil outlet of the protection unit, the generator oil supply port is communicated with the third oil outlet of the generator cooling valve, the oil inlet of the direct drive pressure control valve is communicated with the oil outlet of the mechanical pump, and the oil outlet of the direct drive pressure control valve is communicated with the oil inlet of the actuator, wherein the actuator is the hybrid vehicle clutch, synchronizer or brake;

[0009] The control unit is electrically connected to the electromagnetic pilot valve and the direct-drive pressure control valve respectively, and the control unit is used for:

[0010] When the hybrid vehicle is in a pure electric driving mode or a reverse driving mode, the electromagnetic pilot valve is controlled to be in a closed state, and the direct drive pressure control valve is controlled to be in a closed state;

[0011] When the hybrid vehicle is in a series extended-range driving mode, the electromagnetic pilot valve is controlled to be in a first opening degree, and the direct-drive pressure control valve is controlled to be in a closed state;

[0012] When the hybrid electric vehicle is in a parallel hybrid driving mode, the electromagnetic pilot valve is controlled to be in a second opening, and the direct drive pressure control valve is controlled to be in an open state, wherein the second opening is greater than the first opening, the difference between the first oil pressure of the oil inlet and the second oil pressure of the oil outlet corresponding to the first opening is a first value, the difference between the third oil pressure of the oil inlet and the fourth oil pressure of the oil outlet corresponding to the second opening is a second value, the second oil pressure and the fourth oil pressure are both greater than the preload force of the preload spring of the generator cooling valve, and the first value and the second value are both greater than the preload force of the preload spring of the pressure regulating valve;

[0013] The pressure regulating valve is used for:

[0014] When the difference between the oil pressure at the second oil control port and the oil pressure at the first oil control port does not reach the preload force of the preload spring of the pressure regulating valve, the pressure regulating valve is in the first state;

[0015] When the difference between the oil pressure at the second oil control port and the oil pressure at the first oil control port reaches the preload force of the preload spring of the pressure regulating valve, the valve is in a second state, wherein the first state is that the first oil inlet and the first oil outlet are disconnected, and the second oil inlet and the second oil outlet are disconnected, and the second state is that the first oil inlet and the first oil outlet are connected, and the second oil inlet and the second oil outlet are disconnected;

[0016] The generator cooling valve is used for:

[0017] When the pressure at the oil control port of the generator cooling valve does not reach the preload force of the preload spring of the generator cooling valve, the generator cooling valve is in a closed state;

[0018] When the pressure at the oil control port of the generator cooling valve reaches the preload force of the preload spring of the generator cooling valve, it is in an open state, wherein the closed state is that the third oil inlet and the third oil outlet are disconnected, and the open state is that the third oil inlet and the third oil outlet are connected.

[0019] In one possible implementation, the oil supply unit includes an oil tank and a first filter, the oil inlet of the oil tank is connected to the oil outlet of the motor and the oil outlet of the generator respectively, the oil outlet of the oil tank is connected to the oil inlet of the first filter, the oil outlet of the first filter is connected to the oil inlet of the electric pump, and the oil outlet of the first filter is connected to the oil inlet of the mechanical pump.

[0020] In a possible implementation, the protection unit includes an oil cooler, a second filter and a safety valve, the oil inlet of the oil cooler is respectively connected to the oil outlet of the first one-way valve and the oil outlet of the second one-way valve, the oil outlet of the oil cooler is respectively connected to the oil inlet of the second filter, the oil outlet of the second filter is respectively connected to the third oil inlet and the oil supply port of the motor, the oil inlet of the safety valve is respectively connected to the oil outlet of the first one-way valve and the oil outlet of the second one-way valve, and the oil outlet of the safety valve is respectively connected to the third oil inlet and the oil supply port of the motor.

[0021] In a possible implementation, the set pressure of the safety valve is 0.6 MPa.

[0022] In a possible implementation, the automobile hydraulic system also includes a first pipeline, a second pipeline and a throttle valve, the two ends of the first pipeline are respectively connected to the oil outlet of the second filter and the oil supply port of the motor, the two ends of the second pipeline are respectively connected to the third oil outlet and the oil supply port of the generator, and the two ends of the throttle valve are respectively connected to the first pipeline and the second pipeline.

[0023] In a possible implementation, the automobile hydraulic system includes a plurality of direct-driven pressure control valves, and the oil inlets of the plurality of direct-driven pressure control valves are all connected to the oil outlet of the mechanical pump.

[0024] In one possible implementation, the automobile hydraulic system includes a first direct-drive pressure control valve, a second direct-drive pressure control valve and a third direct-drive pressure control valve, the oil outlet of the first direct-drive pressure control valve is connected to the oil inlet of the hybrid vehicle clutch, the oil outlet of the second direct-drive pressure control valve is connected to the oil inlet of the hybrid vehicle synchronizer, and the oil outlet of the third direct-drive pressure control valve is connected to the oil inlet of the hybrid vehicle brake.

[0025] In a possible implementation, the impeller of the mechanical pump is connected to the output shaft of the engine of the hybrid vehicle through a pin-key fit.

[0026] In one possible implementation, the control unit is electrically connected to the main control unit of the hybrid vehicle, and the control unit is used to receive a driving mode signal sent by the main control unit of the hybrid vehicle, and based on the driving mode signal sent by the main control unit, control the solenoid pilot valve to be in a closed state, in a first opening degree, or in a second opening degree, and control the direct-drive pressure control valve to be in a closed state or an open state.

[0027] In a second aspect, an embodiment of the present application provides a hybrid vehicle, which includes a vehicle hydraulic system as described in the first aspect and possible implementations thereof.

[0028] The technical solution provided by the embodiments of the present application includes at least the following beneficial effects:

[0029] An embodiment of the present application provides an automobile hydraulic system, which includes a control unit, an oil supply unit, an electric pump, a mechanical pump, an electromagnetic pilot valve, a pressure regulating valve, a second one-way valve, a protection unit, a generator cooling valve, a motor oil supply port, a generator oil supply port and a direct-drive pressure control valve.

[0030] When the hybrid vehicle is in pure electric driving mode or reverse driving mode, the control unit controls the electromagnetic pilot valve and the direct drive pressure control valve to be in a closed state. At this time, the electromagnetic pilot valve controls the pressure regulating valve to be in the first state, and controls the generator cooling valve to be in a closed state. When the hybrid vehicle is in a series extended range driving mode, the control unit controls the electromagnetic pilot valve to be in the first opening, and controls the direct drive pressure control valve to be in a closed state. At this time, the electromagnetic pilot valve controls the pressure regulating valve to be in the second state, and controls the generator cooling valve to be in an open state. When the hybrid vehicle is in a parallel hybrid driving mode, the control unit controls the electromagnetic pilot valve to be in the second opening, and controls the direct drive pressure control valve to be in an open state. At this time, the electromagnetic pilot valve controls the pressure regulating valve to be in the second state, and controls the generator cooling valve to be in an open state.

[0031] In this way, when the hybrid vehicle is in pure electric driving mode or reverse driving mode, only the motor oil supply port of the hybrid vehicle is connected to the electric pump. When the hybrid vehicle is in series extended-range driving mode, the motor oil supply port and generator oil supply port of the hybrid vehicle are both connected to the electric pump and the mechanical pump. When the hybrid vehicle is in parallel hybrid driving mode, the motor oil supply port, generator oil supply port and execution structure of the hybrid vehicle are all connected to the electric pump and the mechanical pump. The vehicle hydraulic system can supply oil only to the components of the hybrid vehicle that have oil demand in the current driving mode according to the different driving modes of the hybrid vehicle, and does not supply oil to the components that do not have oil demand in the current driving mode, thereby improving energy utilization.

[0032] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 is a structural schematic diagram of an automobile hydraulic system shown in an embodiment of the present application;

[0035] Figure 2 is a structural schematic diagram of an automobile hydraulic system shown in an embodiment of the present application;

[0036] Figure 3 is a structural schematic diagram of an automobile hydraulic system shown in an embodiment of the present application;

[0037] Figure 4is a structural schematic diagram of an automobile hydraulic system shown in an embodiment of the present application;

[0038] Figure 5 is a structural schematic diagram of an automobile hydraulic system shown in an embodiment of the present application;

[0039] Figure 6 It is a structural schematic diagram of an automobile hydraulic system shown in an embodiment of the present application.

[0040] Legend

[0041] 1. Control unit; 2. Oil supply unit; 3. Electric pump; 4. Mechanical pump; 5. First one-way valve;

[0042] 6. Solenoid pilot valve; 7. Pressure regulating valve; 8. Second check valve; 9. Protection unit;

[0043] 10. Generator cooling valve; 11. Motor oil supply port; 12. Generator oil supply port;

[0044] 13. Direct-drive pressure control valve; 14. First pipeline; 15. Second pipeline; 16. Throttle valve; 17. Accumulator;

[0045] 21. Oil tank; 22. First filter; 91. Oil cooler; 92. Second filter; 93. Safety valve;

[0046] 131. First direct drive pressure control valve; 132. Second direct drive pressure control valve; 133. First direct drive pressure control valve;

[0047] 6a, oil inlet of electromagnetic pilot valve; 6b, oil outlet of electromagnetic pilot valve; 6c, oil control port of electromagnetic pilot valve;

[0048] 7c, first oil control port; 7d, second oil control port; 7e, first oil inlet; 7f, first oil outlet;

[0049] 7g, second oil inlet; 7h, second oil outlet;

[0050] 10i, the third oil inlet; 10j, the third oil outlet; 10c, the oil control port of the generator cooling valve;

[0051] 13a, oil inlet of the direct-drive pressure control valve; 13b, oil outlet of the direct-drive pressure control valve; 13c, oil control port of the direct-drive pressure control valve. DETAILED DESCRIPTION

[0052] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0053] Unless otherwise defined, the technical terms or scientific terms used herein shall have the usual meanings understood by persons with ordinary skills in the field to which the present disclosure belongs. The words "first", "second", "third" and similar words used in the patent application specification and claims of the present disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. Similarly, words such as "one" or "one" do not indicate a quantity limitation, but indicate the existence of at least one. Words such as "include" or "comprise" and similar words mean that the elements or objects appearing before "include" or "comprise" include the elements or objects listed after "include" or "comprise" and their equivalents, and do not exclude other elements or objects. Words such as "connect" or "connected" and similar words are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0054] Hybrid vehicles have gradually gained market favor with their superior energy-saving and emission-reduction performance and excellent user experience. In hybrid vehicles, there are two power systems, the fuel engine and the battery. Under different driving conditions of the vehicle, these two power systems can operate independently as the power output of the vehicle. These two power systems can also operate together as the power output of the vehicle. Hybrid vehicles can travel in pure electric driving mode, reverse driving mode, series extended-range driving mode and parallel hybrid driving mode. When hybrid vehicles travel in different driving modes, the components in the hybrid vehicles that need to be supplied with oil are different. The following is a brief introduction to several different driving modes of hybrid vehicles:

[0055] 1. Pure electric driving mode

[0056] The pure electric driving mode is generally used in scenarios where the car is starting, the car is driving at a low speed, or the car battery has a high charge. When the car is in the pure electric driving mode, the battery directly drives the car's motor, and the motor is connected to the car's wheels through a drive shaft. The motor in the working state drives the wheels to rotate, and the car drives. In other words, in the pure electric driving mode, the car battery directly drives the wheels to rotate, the generator of the hybrid vehicle is in a non-working state, and the actuators such as the clutch, synchronizer and brake of the hybrid vehicle are also in a non-working state. Therefore, only the motor in the hybrid vehicle needs to be supplied with oil to cool and lubricate the motor. Neither the generator nor the actuator in the hybrid vehicle needs to be supplied with oil.

[0057] 2. Reverse driving mode

[0058] The reverse driving mode is the same as the pure electric driving mode. In the reverse driving mode, the car battery directly drives the wheels to rotate through the electric motor, the generator of the hybrid vehicle is in a non-working state, and the actuators such as the clutch, synchronizer and brake of the hybrid vehicle are also in a non-working state. Therefore, only the electric motor in the hybrid vehicle needs to be supplied with oil to cool and lubricate the electric motor. The generator and actuators in the hybrid vehicle do not need to be supplied with oil.

[0059] 3. Series Extended Range Driving Mode

[0060] The series extended-range driving mode is generally used in scenarios where the car is driving at medium speed or the battery power of the car is low. When the car is in the series extended-range driving mode, the engine is in operation, but the engine only drives the generator to rotate to charge the car battery. The engine does not drive the wheels to rotate. At the same time, the car battery directly drives the wheels to rotate through the motor. Therefore, only the motor and generator in the hybrid vehicle need to be supplied with oil to cool and lubricate the motor and the motor. The actuators in the hybrid vehicle do not need to be supplied with oil.

[0061] 4. Parallel Hybrid Driving Mode

[0062] The parallel hybrid driving mode is generally used in the scenario of high-speed driving of the car. When the car is in the parallel hybrid driving mode, the engine is in working state. The engine drives the generator to rotate to charge the car battery and drives the wheels to rotate. At the same time, the car battery also drives the wheels to rotate through the motor. Therefore, the motor and generator in the hybrid car need to be supplied with oil to cool and lubricate the motor and the motor. In addition, the actuator in the hybrid car needs to be supplied with oil to cool and lubricate the actuator structure while making the actuator transmission stable.

[0063] The embodiment of the present application provides a vehicle hydraulic system, which is applied to a hybrid vehicle, such as Figure 1 As shown, the automobile hydraulic system includes a control unit 1, an oil supply unit 2, an electric pump 3, a mechanical pump 4, a first one-way valve 5, an electromagnetic pilot valve 6, a pressure regulating valve 7, a second one-way valve 8, a protection unit 9, a generator cooling valve 10, a motor oil supply port 11, a generator oil supply port 12 and a direct drive pressure control valve 13.

[0064] Among them, the pressure regulating valve 7 has a first oil control port 7c, a second oil control port 7d, a first oil inlet 7e, a first oil outlet 7f, a second oil inlet 7g and a second oil outlet 7h, and the generator cooling valve 10 has a third oil inlet 10i and a third oil outlet 10j.

[0065] like Figure 1As shown, the oil inlet of the oil supply unit 2 is communicated with the oil outlet of the motor and the oil outlet of the generator respectively, the oil inlet of the electric pump 3 is communicated with the oil outlet of the oil supply unit 2, the oil inlet of the mechanical pump 4 is communicated with the oil outlet of the oil supply unit 2, the oil inlet of the first check valve 5 is communicated with the oil outlet of the electric pump 3, the oil inlet 6a of the electromagnetic pilot valve 6 is communicated with the oil outlet of the mechanical pump 4, the oil outlet 6b of the electromagnetic pilot valve 6 is communicated with the oil control port 6c of the electromagnetic pilot valve 6, the first oil control port 7c of the pressure regulating valve 7, and the oil control port 10c of the generator cooling valve 10 respectively, the first oil inlet 7e is communicated with the oil outlet of the mechanical pump 4, the second oil inlet 7g is communicated with the oil outlet of the mechanical pump 4, the second oil outlet 7h is communicated with the mechanical The oil inlet of the pump 4 is connected, the second oil control port 7d of the pressure regulating valve 7 is connected with the oil outlet of the mechanical pump 4, the oil inlet of the second one-way valve 8 is connected with the first oil outlet 7f, the oil inlet of the protection unit 9 is connected with the oil outlet of the first one-way valve 5 and the oil outlet of the second one-way valve 8 respectively, the third oil inlet 10i of the generator cooling valve 10 is connected with the oil outlet of the protection unit 9, the motor oil supply port 11 is connected with the oil outlet of the protection unit 9, the generator oil supply port 12 is connected with the third oil outlet 10j of the generator cooling valve 10, the oil inlet 13a of the direct drive pressure control valve 13 is connected with the oil outlet of the mechanical pump 4, and the oil outlet 13b of the direct drive pressure control valve 13 is connected with the oil inlet of the actuator.

[0066] The electric pump 3 is electrically connected to the battery of the hybrid vehicle, the mechanical pump 4 is drivingly connected to the output shaft of the engine of the hybrid vehicle, and the actuator is a clutch, synchronizer or brake of the hybrid vehicle.

[0067] Below, the various components of the automobile hydraulic system are introduced separately:

[0068] 1. Solenoid pilot valve 6

[0069] The electromagnetic pilot valve 6 is a component in the automobile hydraulic system for controlling the working states of the pressure regulating valve 7 and the generator cooling valve 10. The electromagnetic pilot valve 6 is electrically connected to the control unit 1.

[0070] The solenoid pilot valve 6 includes an oil inlet 6a, an oil outlet 6b and an oil control port 6c. The oil inlet 6a of the solenoid pilot valve 6 is connected to the oil outlet of the mechanical pump 4, and the oil outlet 6b of the solenoid pilot valve 6 is respectively connected to the oil control port 6c of the solenoid pilot valve 6, the first oil control port 7c and the oil control port 10c of the generator cooling valve 10.

[0071] When the magnitude of the current passing through the electromagnetic pilot valve 6 is different, the electromagnetic pilot valve 6 can be in different working states. Figure 1As shown, when the current passing through the electromagnetic pilot valve 6 is less than 300mA (milliamperes), the electromagnetic pilot valve 6 is in a closed state, that is, the oil inlet 6a of the electromagnetic pilot valve 6 is disconnected from the oil outlet 6b of the electromagnetic pilot valve 6, and the oil cannot flow from the oil inlet 6a of the electromagnetic pilot valve 6 to the oil outlet 6b of the electromagnetic pilot valve 6. Figure 2 As shown, when the current passing through the electromagnetic pilot valve 6 is not less than 300mA and less than 750mA, the electromagnetic pilot valve 6 is in an open state, and there is a first opening between the oil inlet 6a and the oil outlet 6b. Figure 3 As shown, when the current passing through the electromagnetic pilot valve 6 is not less than 750 mA and less than 1200 mA, the electromagnetic pilot valve 6 is in an open state, and there is a second opening between the oil inlet 6a and the oil outlet 6b.

[0072] When the solenoid pilot valve 6 is in a closed state, the oil pressure at the oil outlet 6b of the solenoid pilot valve 6 is zero. When the solenoid pilot valve 6 is in a first opening, the first oil pressure at the oil inlet 6a of the solenoid pilot valve 6 is within a first preset range, the second oil pressure at the oil outlet 6b of the solenoid pilot valve 6 is within a first preset range, and the difference between the first oil pressure and the second oil pressure is within a first value. When the solenoid pilot valve 6 is in a second opening, the third oil pressure at the oil inlet 6a of the solenoid pilot valve 6 is within a second preset range, the fourth oil pressure at the oil outlet 6b of the solenoid pilot valve 6 is within a first preset range, and the difference between the third oil pressure and the fourth oil pressure is within a second value.

[0073] Among them, the first preset range is 0.3MPa~0.5MPa (megapascals), the second preset range is 0.8MPa~2MPa, the second oil pressure and the fourth oil pressure are both greater than the preload force of the preload spring of the generator cooling valve 10, and the first value and the second value are both greater than the preload force of the preload spring of the pressure regulating valve 7.

[0074] In this way, by controlling the magnitude of the current passing through the electromagnetic pilot valve 6, the oil pressure at the oil inlet 6a and the oil outlet 6b of the electromagnetic pilot valve 6 can be controlled.

[0075] Optionally, a pressure sensor may be provided at the oil control port 6 c of the electromagnetic pilot valve 6 .

[0076] In this way, the pressure sensor of the oil control port 6c can detect whether the oil pressure at the oil outlet 6b of the electromagnetic pilot valve 6 is within the first preset range.

[0077] 2. Pressure regulating valve 7

[0078] The pressure regulating valve 7 is a component in the automobile hydraulic system used to open or close according to different working states of the electromagnetic pilot valve 6.

[0079] like Figure 1As shown, the first oil control port 7c of the pressure regulating valve 7 is connected to the oil control port 6c of the electromagnetic pilot valve 6, the first oil inlet 7e is connected to the oil outlet of the mechanical pump 4, the second oil inlet 7g is connected to the oil outlet of the mechanical pump 4, the second oil outlet 7h is connected to the oil inlet of the mechanical pump 4, the second oil control port 7d is connected to the oil outlet of the mechanical pump 4, and the first oil outlet 7f is connected to the oil inlet of the second check valve 8.

[0080] like Figure 1 As shown, when the difference between the oil pressure at the second oil control port 7d and the oil pressure at the first oil control port 7c does not reach the preload force of the preload spring of the pressure regulating valve 7, the pressure regulating valve 7 is in the first state.

[0081] like Figure 2 or Figure 3 As shown, when the difference between the oil pressure at the second oil control port 7d and the oil pressure at the first oil control port 7c reaches the preload force of the preload spring of the pressure regulating valve 7, the pressure regulating valve 7 is in the second state.

[0082] like Figure 1 As shown, when the electromagnetic pilot valve 6 is in the closed state, the difference between the oil pressure at the second oil control port 7d and the oil pressure at the first oil control port 7c does not reach the preload force of the preload spring of the pressure regulating valve 7, and the pressure regulating valve 7 is in the first state. Figure 2 or Figure 3 As shown, when the electromagnetic pilot valve 6 is in the first opening or the second opening, since the first value and the second value are both greater than the preload force of the preload spring of the pressure regulating valve 7, the pressure regulating valve 7 is in the second state.

[0083] Among them, the first state is that the first oil inlet 7e and the first oil outlet 7f are disconnected, and the second oil inlet 7g and the second oil outlet 7h are disconnected, and the second state is that the first oil inlet 7e and the first oil outlet 7f are connected, and the second oil inlet 7g and the second oil outlet 7h are disconnected.

[0084] In this way, by controlling the current passing through the electromagnetic pilot valve 6 , the working state of the pressure regulating valve 7 can be controlled, that is, the connection or disconnection between the oil outlet of the mechanical pump 4 and the second one-way valve 8 can be controlled.

[0085] When the pressure regulating valve 7 is in the second state, the oil pressure at the first oil outlet 7f of the pressure regulating valve 7 is within a first preset range.

[0086] Optionally, a pressure sensor may be provided at the second oil control port 7 d of the pressure regulating valve 7 .

[0087] In this way, when the electromagnetic pilot valve 6 is at the first opening, the pressure sensor of the second oil control port 7d can detect whether the oil pressure at the oil inlet 6a of the electromagnetic pilot valve 6 is within the first preset range. When the electromagnetic pilot valve 6 is at the second opening, the pressure sensor of the second oil control port 7d can detect whether the oil pressure at the oil inlet 6a of the electromagnetic pilot valve 6 is within the second preset range.

[0088] 3. Generator cooling valve 10

[0089] The generator cooling valve 10 is a component in the automobile hydraulic system that is used to open or close according to different working states of the electromagnetic pilot valve 6 .

[0090] like Figure 1 As shown, the oil control port 10c of the generator cooling valve 10 is connected to the first oil control port 7c, the third oil inlet 10i of the generator cooling valve 10 is connected to the oil outlet of the protection unit 9, and the third oil outlet 10j of the generator cooling valve 10 is connected to the generator oil supply port 12.

[0091] like Figure 1 As shown, when the pressure at the oil control port 10 c of the generator cooling valve 10 does not reach the preload force of the preload spring of the generator cooling valve 10 , the generator cooling valve 10 is in a closed state.

[0092] like Figure 2 or Figure 3 As shown, when the pressure at the oil control port 10 c of the generator cooling valve 10 reaches the preload force of the preload spring of the generator cooling valve 10 , the generator cooling valve 10 is in an open state.

[0093] like Figure 1 As shown, when the electromagnetic pilot valve 6 is in the closed state, the pressure at the oil control port 10c of the generator cooling valve 10 does not reach the preload force of the preload spring of the generator cooling valve 10, and the generator cooling valve 10 is in the closed state. Figure 2 or Figure 3 As shown, when the electromagnetic pilot valve 6 is at the first opening or the second opening, since the second oil pressure and the fourth oil pressure are both greater than the preload force of the preload spring of the generator cooling valve 10, the generator cooling valve 10 is in an open state.

[0094] Among them, the first state is that the first oil inlet 7e and the first oil outlet 7f are disconnected, and the second oil inlet 7g and the second oil outlet 7h are disconnected, and the second state is that the first oil inlet 7e and the first oil outlet 7f are connected, and the second oil inlet 7g and the second oil outlet 7h are disconnected.

[0095] In this way, by controlling the current passing through the electromagnetic pilot valve 6 , the working state of the pressure regulating valve 7 can be controlled, that is, the connection or disconnection between the oil outlet of the mechanical pump 4 and the second one-way valve 8 can be controlled.

[0096] 4. Direct drive pressure control valve 13

[0097] The direct-drive pressure control valve 13 is a component in the automobile hydraulic system for controlling the connection or disconnection between the oil outlet of the mechanical pump 4 and the oil inlet of the automobile actuator. The direct-drive pressure control valve 13 is electrically connected to the control unit 1 .

[0098] like Figure 1 or Figure 2 As shown, when receiving the closing signal sent by the control unit 1, it is in a closed state, so that the oil inlet 13a of the direct-drive pressure control valve 13 and the oil outlet 13b of the direct-drive pressure control valve 13 are disconnected.

[0099] like Figure 3 As shown, when the opening signal sent by the control unit 1 is received, the direct drive pressure control valve 13 is in the open state, and the oil inlet 13a of the direct drive pressure control valve 13 is connected to the oil outlet 13b of the direct drive pressure control valve 13.

[0100] In this way, the working state of the pressure control valve 13 can be directly driven by the control unit 1, that is, the connection or disconnection between the oil outlet of the mechanical pump 4 and the oil inlet of the vehicle actuator can be controlled.

[0101] 5. Control Unit 1

[0102] The control unit 1 is a component in the automobile hydraulic system for controlling the working states of the electromagnetic pilot valve 6 and the direct-drive pressure control valve 13 based on the driving mode of the automobile. The control unit 1 is electrically connected to the automobile main control unit, the electromagnetic pilot valve 6 and the direct-drive pressure control valve 13 respectively.

[0103] When the vehicle enters the pure electric driving mode or the reverse driving mode, the vehicle control unit sends a first signal to the control unit 1. Figure 1 As shown, the control unit 1 controls the electromagnetic pilot valve 6 to be in a closed state, and controls the direct-drive pressure control valve 13 to be in a closed state.

[0104] When the vehicle enters the series extended range driving mode, the vehicle control unit sends a second signal to the control unit 1. Figure 2 As shown, the control unit 1 controls the electromagnetic pilot valve 6 to be in a first opening degree, and controls the direct-drive pressure control valve 13 to be in a closed state.

[0105] When the vehicle enters the parallel hybrid driving mode, the vehicle control unit sends a third signal to the control unit 1. Figure 3 As shown, the control unit 1 controls the direct drive pressure control valve 13 to be in an open state.

[0106] In this way, the control unit 1 can control the electromagnetic pilot valve 6 to be in a closed state and the direct drive pressure control valve 13 to be in a closed state when the hybrid vehicle is in a pure electric driving mode or a reverse driving mode. At this time, the generator cooling valve 10 is in a closed state, the oil outlet of the mechanical pump 4 is disconnected from the generator oil supply port 12, and the oil outlet of the mechanical pump 4 is disconnected from the oil inlet of the actuator. When the hybrid vehicle is in a series extended range driving mode, the electromagnetic pilot valve 6 is controlled to be in a first opening, the direct drive pressure control valve 13 is controlled to be in a closed state, at this time, the generator cooling valve 10 is in an open state, the oil outlet of the mechanical pump 4 is connected to the generator oil supply port 12, and the oil outlet of the mechanical pump 4 is disconnected from the oil inlet of the actuator. When the hybrid vehicle is in a parallel hybrid driving mode, the electromagnetic pilot valve 6 is controlled to be in a second opening, the direct drive pressure control valve 13 is controlled to be in an open state, at this time, the generator cooling valve 10 is in an open state, the oil outlet of the mechanical pump 4 is connected to the generator oil supply port 12, and the oil outlet of the mechanical pump 4 is connected to the oil inlet of the actuator.

[0107] 6. Electric pump 3

[0108] The electric pump 3 is in the automobile hydraulic system and is used to rotate at different speeds based on the driving mode signal sent by the control unit 1. The electric pump 3 is electrically connected to the control unit 1.

[0109] When the hybrid vehicle is in pure electric driving mode or reverse driving mode, the electric pump 3 rotates at a first preset speed d1; when the hybrid vehicle is in series extended-range driving mode, the electric pump 3 rotates at a second preset speed d2; when the hybrid vehicle is in parallel hybrid driving mode, the electric pump 3 rotates at a third preset speed d3.

[0110] Among them, the value range of the first preset speed d1 can be 600r / min~800r / min (revolutions per minute), the value range of the second preset speed d2 can be 400r / min~600r / min, and the value range of the third preset speed d3 can be 200r / min~400r / min.

[0111] In this way, the electric pump 3 can rotate at different speeds in different driving modes, thereby improving the accuracy of the oil supply amount of the electric pump 3.

[0112] Below, some optional structural features of the automotive hydraulic system are introduced:

[0113] Structural feature 1: The oil supply unit 2 may include an oil tank 21 and a first filter 22 .

[0114] like Figure 4As shown, the oil supply unit 2 includes an oil tank 21 and a first filter 22. The oil inlet of the oil tank 21 is connected to the oil outlet of the motor and the oil outlet of the generator respectively, the oil outlet of the oil tank 21 is connected to the oil inlet of the first filter 22, the oil outlet of the first filter 22 is connected to the oil inlet of the electric pump 3, and the oil outlet of the first filter 22 is connected to the oil inlet of the mechanical pump 4.

[0115] In this way, before the oil enters the electric pump 3 and the mechanical pump 4, the oil can be filtered for the first time, so that there are no impurities such as iron filings and dust in the oil entering the electric pump 3 and the mechanical pump 4, thereby extending the service life of the electric pump 3 and the mechanical pump 4.

[0116] Structural feature 2: The protection unit 9 may include an oil cooler 91 , a second filter 92 and a safety valve 93 .

[0117] like Figure 4 As shown, the protection unit 9 includes an oil cooler 91, a second filter 92 and a safety valve 93. The oil inlet of the oil cooler 91 is connected to the oil outlet of the first one-way valve 5 and the oil outlet of the second one-way valve 8 respectively, the oil outlet of the oil cooler 91 is connected to the oil inlet of the second filter 92, the oil outlet of the second filter 92 is connected to the third oil inlet 10i and the motor oil supply port 11 respectively, the oil inlet of the safety valve 93 is connected to the oil outlet of the first one-way valve 5 and the oil outlet of the second one-way valve 8 respectively, and the oil outlet of the safety valve 93 is connected to the third oil inlet 10i and the motor oil supply port 11 respectively.

[0118] Optionally, the set pressure of the safety valve 93 may be 0.6 MPa.

[0119] When the automobile hydraulic system is in a normal working state, when the first oil inlet 7e is connected to the first oil outlet 7f, the oil pressure at the first oil outlet 7f is within the first preset range, that is, the oil pressure at the first oil outlet 7f is 0.3MPa to 0.5MPa. At this time, the oil pressure at the oil inlet of the safety valve 93 is less than the set pressure of the safety valve 93, the oil inlet of the safety valve 93 and the oil outlet of the safety valve 93 are disconnected, and the oil cannot flow from the oil inlet of the safety valve 93 to the oil outlet of the safety valve 93. When the oil cooler 91 or the second filter 92 is blocked, the oil pressure at the first oil outlet 7f increases. When the oil pressure at the first oil outlet 7f increases to the set pressure, the oil inlet of the safety valve 93 and the oil outlet of the safety valve 93 are connected, and the oil can flow from the oil inlet of the safety valve 93 to the oil outlet of the safety valve 93.

[0120] In this way, when the oil cooler 91 or the second filter 92 is clogged, the safety valve 93 can be switched from a disconnected state to a connected state, so that the oil can pass through the protection unit 9 smoothly.

[0121] Structural feature 3: The automobile hydraulic system also includes a first pipeline 14 , a second pipeline 15 and a throttle valve 16 .

[0122] like Figure 4 As shown, the two ends of the first pipeline 14 are respectively connected to the oil outlet of the second filter 92 and the motor oil supply port 11, the two ends of the second pipeline 15 are respectively connected to the third oil outlet 10j and the generator oil supply port 12, and the two ends of the throttle valve 16 are respectively connected to the first pipeline 14 and the second pipeline 15.

[0123] Thus, in pure electric mode, when the generator cooling valve 10 is in the closed state, a small amount of oil can flow through the throttle valve 16 to the generator oil supply port 12, so that a small amount of oil is always retained in the generator, thereby reducing the starting noise of the generator.

[0124] Structural feature 4: The automobile hydraulic system may further include an accumulator 17 .

[0125] like Figure 4 As shown, the accumulator 17 is communicated with the oil outlet 13 b of the direct drive pressure control valve 13 .

[0126] Optionally, the storage pressure of the accumulator 17 may be 1.8 MPa.

[0127] In this way, when the pressure of the oil flowing out of the oil outlet 13b of the direct-drive pressure control valve 13 is greater than the energy storage pressure, the accumulator 17 can convert the difference between the oil pressure of the oil outlet 13b of the direct-drive pressure control valve 13 and the energy storage pressure into compression energy or potential energy for storage. When the pressure of the oil flowing out of the oil outlet 13b of the direct-drive pressure control valve 13 is less than the energy storage pressure, the accumulator 17 can use the stored compression energy to make up for the difference between the energy storage pressure and the oil pressure of the oil outlet 13b of the direct-drive pressure control valve 13.

[0128] Structural feature 5. The automobile hydraulic system may include a plurality of direct-drive pressure control valves 13 .

[0129] like Figure 5 As shown, the oil inlets 13 a of the multiple direct-drive pressure control valves 13 are all connected to the oil outlets of the mechanical pump 4 .

[0130] Optionally, the automobile hydraulic system may include three direct-drive pressure control valves 13 , namely, a first direct-drive pressure control valve 131 , a second direct-drive pressure control valve 132 and a third direct-drive pressure control valve 133 .

[0131] like Figure 6 As shown, the oil outlet of the first direct drive pressure control valve 131 is connected to the oil inlet of the hybrid vehicle clutch, the oil outlet of the second direct drive pressure control valve 132 is connected to the oil inlet of the hybrid vehicle synchronizer, and the oil outlet of the third direct drive pressure control valve 133 is connected to the oil inlet of the hybrid vehicle brake.

[0132] In this way, the vehicle hydraulic system can deliver oil to multiple actuators of the hybrid vehicle at the same time, improving efficiency.

[0133] Structural feature 6. The automobile hydraulic system may also include a temperature sensor.

[0134] The temperature sensor is located on the motor stator of the hybrid vehicle and is connected to the motor stator. The temperature sensor is electrically connected to the control unit 1. The control unit 1 is electrically connected to the electric pump 3. The temperature sensor is used to detect the real-time temperature of the motor stator. The control unit 1 is used to control the speed of the electric pump 3 based on the real-time temperature of the motor stator.

[0135] When the hybrid vehicle is in pure electric driving mode or reverse driving mode, if the temperature of the motor stator is greater than the preset rated temperature, the control unit 1 controls the electric pump 3 to rotate at a fourth preset speed d4. When the hybrid vehicle is in series extended range driving mode, if the temperature of the motor stator is greater than the preset rated temperature, the control unit 1 controls the electric pump 3 to rotate at a fifth preset speed d5. When the hybrid vehicle is in parallel hybrid driving mode, if the temperature of the motor stator is greater than the preset rated temperature, the control unit 1 controls the electric pump 3 to rotate at a sixth preset speed d6.

[0136] Among them, the preset rated temperature can be 65°C, the relationship between the fourth preset speed d4 and the first preset speed d1 satisfies d4=1.1d1, the relationship between the fifth preset speed d5 and the second preset speed d2 satisfies d5=1.1d2, and the relationship between the sixth preset speed d6 and the third preset speed d3 satisfies d6=1.1d3.

[0137] In this way, when the temperature of the motor stator is greater than the preset rated temperature, the control unit 1 can increase the rotation speed of the electric pump 3 to allow more oil to enter the motor through the motor oil supply port 11 to cool and lubricate the motor.

[0138] An embodiment of the present application provides an automobile hydraulic system, which includes a control unit 1, an oil supply unit 2, an electric pump 3, a mechanical pump 4, an electromagnetic pilot valve 6, a pressure regulating valve 7, a second one-way valve 8, a protection unit 9, a generator cooling valve 10, a motor oil supply port 11, a generator oil supply port 12 and a direct-drive pressure control valve 13.

[0139] When the hybrid vehicle is in pure electric driving mode or reverse driving mode, the control unit 1 controls the electromagnetic pilot valve 6 and the direct drive pressure control valve 13 to be in a closed state. At this time, the electromagnetic pilot valve 6 controls the pressure regulating valve 7 to be in the first state, and controls the generator cooling valve 10 to be in a closed state. When the hybrid vehicle is in a series extended range driving mode, the control unit 1 controls the electromagnetic pilot valve 6 to be in a first opening, and controls the direct drive pressure control valve 13 to be in a closed state. At this time, the electromagnetic pilot valve 6 controls the pressure regulating valve 7 to be in a second state, and controls the generator cooling valve 10 to be in an open state. When the hybrid vehicle is in a parallel hybrid driving mode, the control unit 1 controls the electromagnetic pilot valve 6 to be in a second opening, and controls the direct drive pressure control valve 13 to be in an open state. At this time, the electromagnetic pilot valve 6 controls the pressure regulating valve 7 to be in the second state, and controls the generator cooling valve 10 to be in an open state.

[0140] In this way, when the hybrid vehicle is in pure electric driving mode or reverse driving mode, only the motor oil supply port 11 of the hybrid vehicle is connected to the electric pump 3. When the hybrid vehicle is in series extended-range driving mode, the motor oil supply port 11 and the generator oil supply port 12 of the hybrid vehicle are both connected to the electric pump 3 and the mechanical pump 4. When the hybrid vehicle is in parallel hybrid driving mode, the motor oil supply port 11, the generator oil supply port 12 and the execution structure of the hybrid vehicle are all connected to the electric pump 3 and the mechanical pump 4. The vehicle hydraulic system can supply oil only to the components of the hybrid vehicle that have oil demand in the current driving mode according to the different driving modes of the hybrid vehicle, and does not supply oil to the components that do not have oil demand in the current driving mode, thereby improving energy utilization.

[0141] An embodiment of the present application also provides a hybrid vehicle, which includes the above-mentioned vehicle hydraulic system.

[0142] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. An automobile hydraulic system, characterized in that: The automobile hydraulic system is applied to a hybrid vehicle, and comprises a control unit (1), an oil supply unit (2), an electric pump (3), a mechanical pump (4), a first non-return valve (5), an electromagnetic pilot valve (6), a pressure regulating valve (7), a second non-return valve (8), a protection unit (9), a generator cooling valve (10), an electric motor oil supply port (11), a generator oil supply port (12) and a direct drive pressure control valve (13), wherein the pressure regulating valve (7) has a first oil control port (7c), a second oil control port (7d), a first oil inlet (7e), a first oil outlet (7f), a second oil inlet (7g) and a second oil outlet (7h), and the generator cooling valve (10) has a third oil inlet (10i) and a third oil outlet (10j); The oil inlet of the oil supply unit (2) is respectively connected to the oil outlet of the motor and the oil outlet of the generator, the electric pump (3) is electrically connected to the battery of the hybrid vehicle, when the motor of the hybrid vehicle rotates, the electric pump (3) is in an on state, and the mechanical pump (4) is drivingly connected to the output shaft of the engine of the hybrid vehicle; The oil inlet of the electric pump (3) is connected to the oil outlet of the oil supply unit (2), the oil inlet of the mechanical pump (4) is connected to the oil outlet of the oil supply unit (2), the oil inlet of the first check valve (5) is connected to the oil outlet of the electric pump (3), the oil inlet (6a) of the electromagnetic pilot valve (6) is connected to the oil outlet of the mechanical pump (4), and the oil outlet (6b) of the electromagnetic pilot valve (6) is connected to the oil outlet of the electromagnetic pilot valve ( The oil control port (6c) of the pressure regulating valve (7), the first oil control port (7c) of the pressure regulating valve (7), and the oil control port (10c) of the generator cooling valve (10) are connected; the first oil inlet (7e) is connected to the oil outlet of the mechanical pump (4); the second oil inlet (7g) is connected to the oil outlet of the mechanical pump (4); the second oil outlet (7h) is connected to the oil inlet of the mechanical pump (4); the second oil control port (7d) of the pressure regulating valve (7) is connected to the oil control port (10c) of the generator cooling valve (10); the first oil inlet (7e) is connected to the oil outlet of the mechanical pump (4); the second oil inlet (7g) is connected to the oil outlet of the mechanical pump (4); the second oil outlet (7h) is connected to the oil inlet of the mechanical pump (4); the second oil control port (7d) of the pressure regulating valve (7) is connected to the oil control port (10c) of ) is communicated with the oil outlet of the mechanical pump (4), the oil inlet of the second one-way valve (8) is communicated with the first oil outlet (7f), the oil inlet of the protection unit (9) is communicated with the oil outlet of the first one-way valve (5) and the oil outlet of the second one-way valve (8) respectively, the third oil inlet (10i) of the generator cooling valve (10) is communicated with the oil outlet of the protection unit (9), the motor oil supply port (11) is communicated with the oil outlet of the protection unit (9), the generator oil supply port (12) is communicated with the third oil outlet (10j) of the generator cooling valve (10), the oil inlet (13a) of the direct drive pressure control valve (13) is communicated with the oil outlet of the mechanical pump (4), and the oil outlet (13b) of the direct drive pressure control valve (13) is communicated with the oil inlet of the actuator, wherein the actuator is the clutch, synchronizer or brake of the hybrid vehicle; The control unit (1) is electrically connected to the electromagnetic pilot valve (6) and the direct-drive pressure control valve (13) respectively, and the control unit (1) is used to: When the hybrid vehicle is in a pure electric driving mode or a reverse driving mode, the electromagnetic pilot valve (6) is controlled to be in a closed state, and the direct drive pressure control valve (13) is controlled to be in a closed state; When the hybrid vehicle is in a series extended-range driving mode, the electromagnetic pilot valve (6) is controlled to be in a first opening degree, and the direct-drive pressure control valve (13) is controlled to be in a closed state; When the hybrid vehicle is in a parallel hybrid driving mode, the electromagnetic pilot valve (6) is controlled to be in a second opening, and the direct drive pressure control valve (13) is controlled to be in an open state, wherein the second opening is greater than the first opening, the difference between the first oil pressure of the oil inlet (6a) and the second oil pressure of the oil outlet (6b) corresponding to the first opening is a first value, the difference between the third oil pressure of the oil inlet (6a) and the fourth oil pressure of the oil outlet (6b) corresponding to the second opening is a second value, the second oil pressure and the fourth oil pressure are both greater than the preload force of the preload spring of the generator cooling valve (10), and the first value and the second value are both greater than the preload force of the preload spring of the pressure regulating valve (7); The pressure regulating valve (7) is used for: When the difference between the oil pressure at the second oil control port (7d) and the oil pressure at the first oil control port (7c) does not reach the preload force of the preload spring of the pressure regulating valve (7), it is in the first state; When the difference between the oil pressure at the second oil control port (7d) and the oil pressure at the first oil control port (7c) reaches the preload force of the preload spring of the pressure regulating valve (7), the valve is in a second state, wherein the first state is that the first oil inlet (7e) and the first oil outlet (7f) are disconnected, and the second oil inlet (7g) and the second oil outlet (7h) are disconnected, and the second state is that the first oil inlet (7e) and the first oil outlet (7f) are connected, and the second oil inlet (7g) and the second oil outlet (7h) are disconnected; The generator cooling valve (10) is used for: When the pressure at the oil control port (10c) of the generator cooling valve (10) does not reach the preload force of the preload spring of the generator cooling valve (10), the generator cooling valve (10) is in a closed state; When the pressure at the oil control port (10c) of the generator cooling valve (10) reaches the preload force of the preload spring of the generator cooling valve (10), it is in an open state, wherein the closed state is when the third oil inlet (10i) and the third oil outlet (10j) are disconnected, and the open state is when the third oil inlet (10i) and the third oil outlet (10j) are connected.

2. The automotive hydraulic system according to claim 1, characterized in that: The oil supply unit (2) comprises an oil tank (21) and a first filter (22); the oil inlet of the oil tank (21) is respectively connected to the oil outlet of the motor and the oil outlet of the generator; the oil outlet of the oil tank (21) is connected to the oil inlet of the first filter (22); the oil outlet of the first filter (22) is connected to the oil inlet of the electric pump (3); and the oil outlet of the first filter (22) is connected to the oil inlet of the mechanical pump (4).

3. The automotive hydraulic system according to claim 1, characterized in that: The protection unit (9) comprises an oil cooler (91), a second filter (92) and a safety valve (93); the oil inlet of the oil cooler (91) is respectively connected to the oil outlet of the first one-way valve (5) and the oil outlet of the second one-way valve (8); the oil outlet of the oil cooler (91) is respectively connected to the oil inlet of the second filter (92); the oil outlet of the second filter (92) is respectively connected to the third oil inlet (10i) and the motor oil supply port (11); the oil inlet of the safety valve (93) is respectively connected to the oil outlet of the first one-way valve (5) and the oil outlet of the second one-way valve (8); the oil outlet of the safety valve (93) is respectively connected to the third oil inlet (10i) and the motor oil supply port (11).

4. The automotive hydraulic system according to claim 3, characterized in that: The set pressure of the safety valve (93) is 0.6 MPa.

5. The automotive hydraulic system according to claim 3, characterized in that: The automobile hydraulic system further comprises a first pipeline (14), a second pipeline (15) and a throttle valve (16); the two ends of the first pipeline (14) are respectively connected to the oil outlet of the second filter (92) and the motor oil supply port (11); the two ends of the second pipeline (15) are respectively connected to the third oil outlet (10j) and the generator oil supply port (12); and the two ends of the throttle valve (16) are respectively connected to the first pipeline (14) and the second pipeline (15).

6. The automotive hydraulic system according to claim 1, characterized in that: The automobile hydraulic system comprises a plurality of direct-drive pressure control valves (13), and the oil inlets (13a) of the plurality of direct-drive pressure control valves (13) are all connected to the oil outlet of the mechanical pump (4).

7. The automotive hydraulic system according to claim 6, characterized in that: The automobile hydraulic system comprises a first direct-drive pressure control valve (131), a second direct-drive pressure control valve (132) and a third direct-drive pressure control valve (133), wherein the oil outlet of the first direct-drive pressure control valve (131) is connected to the oil inlet of the hybrid vehicle clutch, the oil outlet of the second direct-drive pressure control valve (132) is connected to the oil inlet of the hybrid vehicle synchronizer, and the oil outlet of the third direct-drive pressure control valve (133) is connected to the oil inlet of the hybrid vehicle brake.

8. The automotive hydraulic system according to claim 1, characterized in that: The impeller of the mechanical pump (4) is connected to the output shaft of the engine of the hybrid vehicle through a pin key.

9. The automotive hydraulic system according to claim 1, characterized in that: The control unit (1) is electrically connected to the main control unit of the hybrid vehicle, and is used to receive a driving mode signal sent by the main control unit of the hybrid vehicle, and based on the driving mode signal sent by the main control unit, control the electromagnetic pilot valve (6) to be in a closed state, in a first opening degree, or in a second opening degree, and control the direct-drive pressure control valve (13) to be in a closed state or an open state.

10. A hybrid vehicle, characterized in that: The hybrid vehicle comprises the vehicle hydraulic system as claimed in any one of claims 1 to 9.

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