A hydraulic control system, control method and automobile for a hybrid transmission

Abstract

The purpose of this invention is to provide a low-cost, simple-structured hydraulic control system, control method, and vehicle for a hybrid power transmission. The hydraulic control system includes: an oil tank and an oil pump connected thereto; a single clutch disposed between the generator and drive motor of the hybrid vehicle, the single clutch having a clutch lubrication oil circuit and a clutch pressure oil circuit; a switching solenoid valve, one inlet of which is connected to the oil tank and the other inlet to the oil pump; a switching mechanical valve, one inlet of which is connected to the oil tank and the other inlet to the oil pump, and the outlet of which is connected to the clutch pressure oil circuit; a main pressure regulating mechanical valve, the inlet of which is connected to the oil pump, the outlet of which is connected to the clutch lubrication oil circuit, and the feedback terminal of which is connected to the oil pump; the outlet of the switching solenoid valve and the control terminal of the switching mechanical valve are connected to the control terminal of the main pressure regulating mechanical valve.

Description

Technical Field

[0001] This invention belongs to the field of hybrid vehicle transmission technology, specifically relating to a hydraulic control system, control method, and automobile for a hybrid transmission. Background Technology

[0002] With increasingly stringent national regulations on vehicle fuel consumption and rising user operating costs, hybrid vehicles, known for their low fuel consumption, are gaining increasing public acceptance. A hybrid vehicle's system includes a generator, drive motor, clutch, shaft gears, hydraulic system, and other components. The generator is connected to the engine, and the fuel consumed by the engine can be used to generate electricity that is stored in the battery. The drive motor is connected to the differential, which directly drives the vehicle by connecting to the wheels via a drive shaft. A clutch structure between the generator and drive motor allows for direct engine-driven operation.

[0003] The main operating modes of a hybrid transmission are: Series mode: When the battery has sufficient charge, the drive motor consumes battery power to propel the vehicle. When the battery is low on charge, the engine drives the generator to store electricity in the battery, and the drive motor then consumes battery power to propel the vehicle. In this mode, the hydraulic system provides lubrication and cooling for the generator, drive motor, and shaft system. Parallel mode: The clutch is engaged, and the engine, generator, and drive motor are connected. In this mode, the engine can directly drive the vehicle, or the drive motor and engine can drive the vehicle together. In this mode, the hydraulic system provides lubrication and cooling for the generator, drive motor, shaft system, and clutch, and the clutch must be engaged.

[0004] In existing technologies (CN 213920655 U Hybrid vehicles and their hydraulic systems, transmissions, and powertrains / CN 107054056 B Hybrid vehicles), the hydraulic system uses two on / off solenoid valves to control one clutch. In the patent (CN213920655 U Hybrid vehicles and their hydraulic systems, transmissions, and powertrains), the hydraulic system uses three linear valves to control one clutch and one lubrication path. Both of these prior art technologies use a large number of solenoid valves, resulting in higher costs. Summary of the Invention

[0005] The purpose of this invention is to provide a low-cost, simple-structured hydraulic control system, control method, and vehicle for a hybrid power transmission.

[0006] The technical solution of this invention is as follows:

[0007] This invention provides a hydraulic control system for a hybrid power transmission, comprising:

[0008] Controller;

[0009] Fuel tank and the fuel pump connected to it;

[0010] A single clutch is arranged between the generator and the drive motor of a hybrid electric vehicle, the single clutch having a clutch lubrication oil passage and a clutch pressure oil passage.

[0011] A switching solenoid valve has two oil inlets and one oil outlet. One oil inlet of the switching solenoid valve is connected to an oil tank, and the other oil inlet is connected to an oil pump.

[0012] A switching mechanical valve has two oil inlets and one oil outlet. One oil inlet of the switching mechanical valve is connected to the oil tank, the other oil inlet is connected to the oil pump, and the oil outlet of the switching mechanical valve is connected to the clutch pressure oil circuit.

[0013] The main pressure regulating mechanical valve has an oil inlet and an oil outlet. The oil inlet of the main pressure regulating mechanical valve is connected to an oil pump, the oil outlet of the main pressure regulating mechanical valve is connected to the clutch lubrication oil circuit, and the feedback end of the main pressure regulating mechanical valve is connected to the oil pump.

[0014] The oil outlet of the switching solenoid valve, the control terminal of the switching mechanical valve, and the control terminal of the main pressure regulating mechanical valve are connected.

[0015] The controller controls the switching solenoid valve to regulate the oil supply pressure to the clutch pressure oil circuit, thereby achieving single clutch engagement or disengagement control.

[0016] Preferably, the hydraulic control system further includes:

[0017] The main pressure switching mechanical valve has two oil inlets and one oil outlet. One oil inlet of the main pressure switching mechanical valve is connected to the oil tank, and the other oil inlet is connected to the oil pump.

[0018] The oil outlet of the main pressure switching mechanical valve is connected to the control end of the main pressure regulating mechanical valve, and the control end of the main pressure switching mechanical valve is connected to the oil outlet of the switching solenoid valve, so as to realize the indirect connection between the control end of the main pressure regulating mechanical valve and the oil outlet of the switching solenoid valve.

[0019] Preferably, the hydraulic control system further includes:

[0020] An accumulator connected to the oil line between the switching mechanical valve and the clutch pressure oil line.

[0021] Preferably, a damping orifice is arranged in the oil line between the switching mechanical valve and the oil pump.

[0022] This invention provides a hydraulic control system for a hybrid power transmission, the hydraulic control system comprising:

[0023] Controller;

[0024] Fuel tank and the fuel pump connected to it;

[0025] A dual clutch is arranged between the generator and the drive motor of a hybrid electric vehicle, the dual clutch having one clutch lubrication oil passage and two clutch pressure oil passages.

[0026] Two solenoid valves are provided, each with two inlets and one outlet; one inlet of each solenoid valve is connected to the oil tank and the other inlet is connected to the oil pump.

[0027] Two switching mechanical valves, each having two oil inlets and one oil outlet, one oil inlet of each switching mechanical valve connected to the oil tank and the other oil inlet connected to the oil pump, and the oil outlet of each switching mechanical valve connected to one of the clutch pressure oil circuits.

[0028] The main pressure regulating mechanical valve has an oil inlet and an oil outlet. The oil inlet of the main pressure regulating mechanical valve is connected to an oil pump, the oil outlet of the main pressure regulating mechanical valve is connected to the clutch lubrication oil circuit, and the feedback end of the main pressure regulating mechanical valve is connected to the oil pump.

[0029] The main pressure switching mechanical valve has two oil inlets, one oil outlet, and two control terminals. One oil inlet of the main pressure switching mechanical valve is connected to the oil tank, and the other oil inlet is connected to the oil pump. The oil outlet of the main pressure switching mechanical valve is connected to the control terminal of the main pressure regulating mechanical valve.

[0030] Each of the aforementioned solenoid valves has its oil outlet connected to a control terminal of a switching mechanical valve and a control terminal of the main pressure switching mechanical valve.

[0031] The controller controls each of the solenoid valves to regulate the oil supply pressure to the clutch pressure oil circuit, thereby controlling the engagement or disengagement of the dual clutches.

[0032] Preferably, the hydraulic control system further includes:

[0033] An accumulator connected to the oil line between the switching mechanical valve and the clutch pressure oil line.

[0034] Preferably, a damping orifice is arranged in the oil line between the switching mechanical valve and the oil pump.

[0035] The present invention also provides a control method for a hydraulic control system of a hybrid transmission, applied to the aforementioned hydraulic control system of a hybrid transmission, the control method comprising:

[0036] When the hybrid vehicle is determined to be in series drive mode, the controller controls the solenoid valve to open the oil outlet and the oil tank, so that the main pressure regulating mechanical valve opens the oil pump and the clutch lubrication oil circuit, and the switching mechanical valve opens the clutch pressure oil circuit and the oil tank, so that the oil supply pressure entering the clutch pressure oil circuit is 0 bar, thereby realizing the disengagement of the single clutch.

[0037] When the hybrid vehicle is in parallel drive mode, the controller controls the oil outlet of the solenoid valve and the oil pump to be turned on, so that the main pressure regulating mechanical valve turns on the oil pump and the clutch lubrication oil circuit, and the switching mechanical valve turns on the clutch pressure oil circuit and the oil pump, so that the oil supply pressure entering the clutch pressure oil circuit is a preset high pressure, thereby realizing the engagement of the single clutch.

[0038] The present invention also provides a control method for a hydraulic control system of a hybrid transmission, applied to the aforementioned hydraulic control system of a hybrid transmission, the control method comprising:

[0039] When the hybrid vehicle is determined to be in series drive mode, the controller controls the oil outlet of the two switching solenoid valves and the oil tank to be connected, so that the main pressure regulating mechanical valve connects the oil pump and the clutch lubrication oil circuit, and the two switching mechanical valves connect the corresponding clutch pressure oil circuit and the oil tank, so that the oil supply pressure entering each clutch pressure oil circuit is 0 bar, thereby realizing the disengagement of the dual clutch.

[0040] When it is determined that the hybrid vehicle is in parallel drive mode and one of the target clutches in the dual clutches needs to be engaged, the controller controls the oil outlet of the solenoid valve corresponding to the target clutch and the oil pump to be open. This causes the main pressure regulating mechanical valve to open the oil pump and the clutch lubrication oil circuit, and causes the switching mechanical valve corresponding to the target clutch to open the clutch pressure oil circuit and the oil pump. This ensures that the oil supply pressure entering the clutch pressure oil circuit corresponding to the target clutch is a preset high pressure, thus achieving engagement of the target clutch. At the same time, the controller also controls the oil outlet of the solenoid valve corresponding to the remaining clutch and the oil tank to be open. This causes the switching mechanical valve corresponding to the remaining clutch to open the corresponding clutch pressure oil circuit and the oil tank, ensuring that the oil supply pressure entering the clutch pressure oil circuit corresponding to the remaining clutch is 0 bar, thus achieving disengagement of the remaining clutch.

[0041] The present invention also provides a vehicle including the hydraulic control system of the above-described hybrid transmission or the hydraulic control system of the above-described hybrid transmission.

[0042] The beneficial effects of this invention are as follows:

[0043] This invention uses one solenoid valve to control the oil supply pressure of the clutch pressure circuit of one clutch, and two solenoid valves to control the oil supply pressure of the clutch pressure circuits of two clutches, thus meeting the needs of single-speed and two-speed hybrid transmissions. Compared with traditional hydraulic systems, it reduces the use of at least one solenoid valve, further simplifying the hydraulic system structure and reducing costs. Attached Figure Description

[0044] Figure 1 This is a structural diagram of the hydraulic control system in this embodiment, in which two switching solenoid valves control two clutches.

[0045] Figure 2 This is a structural diagram of a hydraulic control system in this embodiment, in which a switching solenoid valve controls a clutch.

[0046] Figure 3 This is a simplified structural diagram of a hydraulic control system for controlling a clutch using a switching solenoid valve, as described in this embodiment.

[0047] In the diagram: 1-First oil passage, 2-Second oil passage, 3-Third oil passage, 4-Fourth oil passage, 5-Fifth oil passage, 6-Sixth oil passage, 7-Seventh oil passage, 8-Eighth oil passage, 9-Ninth oil passage, 10-Tenth oil passage, 11-Eleventh oil passage, 12-Twelfth oil passage, 13-Thirteenth oil passage, 14-Fourteenth oil passage, 15-Fifteenth oil passage, 16-Sixteenth oil passage, 17-Seventeenth oil passage, 18-Eighteenth oil passage, 19-Nineteenth oil passage, 21-First damping hole, 22-Second damping hole, 31 - Oil tank, 32- Filter, 33- Oil pump, 34- Main pressure regulating mechanical valve, 35- Main pressure switching mechanical valve, 351- First control terminal of main pressure switching mechanical valve, 352- Second control terminal of main pressure switching mechanical valve, 36- First switching solenoid valve, 37- Second switching solenoid valve, 38- First switching mechanical valve, 39- Second switching mechanical valve, 40- First accumulator, 41- Second accumulator, 51- Clutch cooling and lubrication oil circuit, 52- First clutch pressure oil circuit, 53- Second clutch pressure oil circuit. Detailed Implementation

[0048] The invention will now be further described with reference to the accompanying drawings.

[0049] like Figure 1 As shown, this embodiment provides a hydraulic control system for a hybrid power transmission, which includes:

[0050] Controller;

[0051] Oil tank 31 and oil pump 33 connected thereto;

[0052] A dual clutch is arranged between the generator and the drive motor of a hybrid electric vehicle, the dual clutch having a clutch lubrication oil passage 51 (corresponding to...). Figure 1 (cooling and lubrication) and two clutch pressure oil circuits (corresponding to the first clutch pressure oil circuit 52 and the second clutch pressure oil circuit 53, the first clutch pressure oil circuit 52 specifically corresponds to Figure 1 The pressure of clutch 1 in the oil circuit 53 of the second clutch corresponds specifically to the pressure of clutch 2.

[0053] Two switching solenoid valves (corresponding to the first switching solenoid valve 36 and the second switching solenoid valve 37) are provided, each with two oil inlets and one oil outlet; one oil inlet of each switching solenoid valve is connected to the oil tank 31 and the other oil inlet is connected to the oil pump 33.

[0054] Two switching mechanical valves (corresponding to the first switching mechanical valve 38 and the second switching mechanical valve 39), each switching mechanical valve has two oil inlets and one oil outlet. One oil inlet of each switching mechanical valve is connected to the oil tank 31, and the other oil inlet is connected to the oil pump 33 (from... Figure 1 As can be seen, one oil inlet of the first switching mechanical valve 38 is connected to the oil tank 31 and the other oil inlet is connected to the oil pump 33. Similarly, one oil inlet of the second switching mechanical valve 39 is connected to the oil tank 31 and the other oil inlet is connected to the oil pump 33. The oil outlet of each of the switching mechanical valves is connected to one of the clutch pressure oil circuits (specifically, the oil outlet of the first switching mechanical valve 38 is connected to the first clutch pressure oil circuit 52, and the oil outlet of the second switching mechanical valve 39 is connected to the second clutch pressure oil circuit 53).

[0055] The main pressure regulating mechanical valve 34 has an oil inlet and an oil outlet. The oil inlet of the main pressure regulating mechanical valve 34 is connected to the oil pump 33, the oil outlet of the main pressure regulating mechanical valve 34 is connected to the clutch lubrication oil circuit 51, and the feedback end of the main pressure regulating mechanical valve 34 is connected to the oil pump 33.

[0056] The main pressure switching mechanical valve 35 has two oil inlets, one oil outlet and two control terminals. One oil inlet of the main pressure switching mechanical valve 35 is connected to the oil tank 31 and the other oil inlet is connected to the oil pump 33. The oil outlet of the main pressure switching mechanical valve 35 is connected to the control terminal of the main pressure regulating mechanical valve 34.

[0057] Each of the aforementioned solenoid valves has its oil outlet connected to a control terminal of a switching mechanical valve and a control terminal of the main pressure switching mechanical valve 35 (i.e., the oil outlet of the first solenoid valve 36 and the control terminal of the first switching mechanical valve 38 are connected to the first control terminal 351 of the main pressure switching control valve 35, and the oil outlet of the second solenoid valve 37 and the second switching mechanical valve 39 are connected to the second control terminal 352 of the main pressure switching control valve 35).

[0058] The controller regulates the oil supply pressure to the clutch pressure oil circuit by controlling each of the solenoid valves, thereby achieving the engagement or disengagement control of the dual clutch. The specific control principle of the controller for each solenoid valve is as follows:

[0059] When the hybrid vehicle is determined to be in series drive mode, the controller controls the oil outlet of the two switching solenoid valves and the oil tank 31 to be connected, so that the main pressure regulating mechanical valve connects the oil pump 33 and the clutch lubrication oil circuit 51, and the two switching mechanical valves connect the corresponding clutch pressure oil circuits and the oil tank 31, so that the oil supply pressure entering each clutch pressure oil circuit is 0 bar, thereby realizing the disengagement of the dual clutch.

[0060] When it is determined that the hybrid vehicle is in parallel drive mode and one of the target clutches in the dual clutches needs to be engaged, the controller controls the oil outlet of the solenoid valve corresponding to the target clutch and the oil pump 33 to be turned on. This causes the main pressure regulating mechanical valve 34 to turn on the oil pump 33 and the clutch lubrication oil circuit 51, and causes the switching mechanical valve corresponding to the target clutch to turn on the clutch pressure oil circuit and the oil pump 33. This sets the oil supply pressure entering the clutch pressure oil circuit corresponding to the target clutch to a preset high pressure, thus achieving engagement of the target clutch. At the same time, the controller also controls the oil outlet of the solenoid valve corresponding to the remaining clutch and the oil tank 31 to be turned on. This causes the switching mechanical valve corresponding to the remaining clutch to turn on the corresponding clutch pressure oil circuit and the oil tank 31, setting the oil supply pressure entering the clutch pressure oil circuit corresponding to the remaining clutch to 0 bar, thus achieving disengagement of the remaining clutch.

[0061] Specifically, such as Figure 1The hydraulic control system in this embodiment includes a first oil circuit 1, a second oil circuit 2, a third oil circuit 3, a fourth oil circuit 4, a fifth oil circuit 5, a sixth oil circuit 6, a seventh oil circuit 7, an eighth oil circuit 8, a ninth oil circuit 9, a tenth oil circuit 10, an eleventh oil circuit 11, a twelfth oil circuit 12, a thirteenth oil circuit 13, a fourteenth oil circuit 14, a fifteenth oil circuit 15, a sixteenth oil circuit 16, a seventeenth oil circuit 17, an eighteenth oil circuit 18, a nineteenth oil circuit 19, a first damping orifice 21, and a second damping orifice 22. 31. Oil tank; 32. Filter; 33. Oil pump; 34. Main pressure regulating mechanical valve; 35. Main pressure switching mechanical valve; 351. First control terminal of main pressure switching mechanical valve; 352. Second control terminal of main pressure switching mechanical valve; 36. First switch solenoid valve; 37. Second switch solenoid valve; 38. First switching mechanical valve; 39. Second switching mechanical valve; 40. First accumulator; 41. Second accumulator; 51. Clutch cooling and lubrication oil circuit; 52. First clutch pressure oil circuit; 53. Second clutch pressure oil circuit.

[0062] The connection relationships of the above components are as follows:

[0063] like Figure 1As shown, filter 32 is connected to oil tank 31 via first oil passage 1, and the oil inlet of oil pump 33 is connected to filter 32 via second oil passage 2. The oil inlet of main pressure regulating mechanical valve 34 is connected to the outlet of oil pump 33 via third oil passage 3, and third oil passage 3 is connected to fourth oil passage 4, fifth oil passage 5, sixth oil passage 6, seventh oil passage 7, eighth oil passage 8, and ninth oil passage 9. The right feedback end of main pressure regulating mechanical valve 34 is connected to fifth oil passage 5, and the left control end of main pressure regulating mechanical valve 34 is connected to the outlet of main pressure switching mechanical valve 35 via thirteenth oil passage 13. The outlet of main pressure regulating mechanical valve 34 is connected to twelfth oil passage 12, and twelfth oil passage 12 is connected to clutch lubrication oil passage 51. The inlet of the main pressure switching mechanical valve 35 is connected to the fourth oil passage 4 via the sixth oil passage 6. The first control terminal 351 of the main pressure switching mechanical valve 35 is connected to the tenth oil passage 10 via the fourteenth oil passage 14. The second control terminal 352 of the main pressure switching mechanical valve 35 is connected to the eleventh oil passage 11 via the fifteenth oil passage 15. The first control terminal 351 and the second control terminal 352 of the main pressure switching mechanical valve 35 are not connected. The inlet of the first switching solenoid valve 36 is connected to the fourth oil passage 4 via the eighth oil passage 8. The outlet of the first switching solenoid valve 36 is connected to the right control terminal of the first switching mechanical valve 38 via the tenth oil passage 10. The inlet of the first switching mechanical valve 38 is connected to the fourth oil passage 4 via the seventh oil passage 7. The first damping orifice 21 is arranged in the seventh oil passage 7. The outlet of the first switching mechanical valve 38 is connected to the sixteenth oil passage 16. The sixteenth oil passage 16 is connected to the first accumulator 40 via the eighteenth oil passage 18. The sixteenth oil passage 16 is connected to the first clutch pressure oil passage 52. The inlet of the second switching solenoid valve 37 is connected to the fourth oil passage 4. The outlet of the second switching solenoid valve 37 is connected to the right control end of the second switching mechanical valve 39 via the eleventh oil passage 11. The inlet of the second switching mechanical valve 39 is connected to the fourth oil passage 4 via the ninth oil passage 9. The second damping orifice 22 is arranged in the ninth oil passage 9. The outlet of the second switching mechanical valve 39 is connected to the seventeenth oil passage 17. The seventeenth oil passage 17 is connected to the second accumulator 41 via the nineteenth oil passage 19. The seventeenth oil passage 17 is connected to the second clutch pressure oil passage 53.

[0064] In this embodiment, the main pressure regulating mechanical valve 34 is a two-position two-way mechanical valve. When the main pressure regulating mechanical valve 34 is in the left working position, the third oil circuit 3 is disconnected from the twelfth oil circuit 12. When the main pressure regulating mechanical valve 34 is in the right working position, the third oil circuit 3 is connected to the twelfth oil circuit 12.

[0065] In this embodiment, the main pressure switching mechanical valve 35 is a two-position three-way mechanical valve. When the main pressure switching mechanical valve 35 is in the left working position, the thirteenth oil circuit 13 is connected to the oil tank 31 and disconnected from the sixth oil circuit 6. When the main pressure switching mechanical valve 35 is in the right working position, the thirteenth oil circuit 13 is disconnected from the oil tank 31 and connected to the sixth oil circuit 6.

[0066] In this embodiment, both the first solenoid valve 36 and the second solenoid valve 37 are two-position three-way solenoid valves. When the first solenoid valve 36 is not energized, it is in the right working position. At this time, the tenth oil circuit 10 is connected to the oil tank 31, and the tenth oil circuit 10 is disconnected from the eighth oil circuit 8 and the fourth oil circuit 4. When the first solenoid valve 36 is energized, it is in the left working position. At this time, the tenth oil circuit 10 is disconnected from the oil tank 31, and the tenth oil circuit 10 is connected to the eighth oil circuit 8 and the fourth oil circuit 4. When the second solenoid valve 37 is not energized, it is in the right working position. At this time, the eleventh oil circuit 11 is connected to the oil tank 31, and the eleventh oil circuit 11 is disconnected from the fourth oil circuit 4. When the second solenoid valve 37 is energized, it is in the left working position. At this time, the eleventh oil circuit 11 is disconnected from the oil tank 31, and the eleventh oil circuit 11 is connected to the fourth oil circuit 4.

[0067] In this embodiment, the first switching mechanical valve 38 is a two-position three-way mechanical valve. When the first switching mechanical valve 38 is in the left working position, the sixteenth oil passage 16 is connected to the oil tank 31 and disconnected from the seventh oil passage 7. When the first switching mechanical valve 38 is in the right working position, the sixteenth oil passage 16 is disconnected from the oil tank 31 and connected to the seventh oil passage 7.

[0068] In this embodiment, the second switching mechanical valve 39 is a two-position three-way mechanical valve. When the second switching mechanical valve 39 is in the left working position, the seventeenth oil passage 17 is connected to the oil tank 31 and disconnected from the ninth oil passage 9. When the second switching mechanical valve 39 is in the right working position, the seventeenth oil passage 17 is disconnected from the oil tank 31 and connected to the ninth oil passage 9.

[0069] In this embodiment, the oil pump 33 can be driven by a drive motor, an engine or a generator, or an independent motor.

[0070] The working process of this embodiment is as follows:

[0071] like Figure 1 The diagram shown is a structural diagram of a hybrid hydraulic control system in which two switching solenoid valves control two clutches.

[0072] When the hybrid transmission is in series mode, the clutch is disengaged, the oil pump 33 operates, and the working oil in the oil tank 31 passes through the first oil passage 1 and the filter 32 and enters the inlet of the oil pump 33. The working oil from the outlet of oil pump 33 enters the right feedback end of the main pressure regulating mechanical valve 34 through the third oil passage 3, the fourth oil passage 4, and the fifth oil passage 5. The working oil from the outlet of oil pump 33 enters the inlet of the first switch solenoid valve 36 and the second switch solenoid valve 37 through the third oil passage 3, the fourth oil passage 4, and the eighth oil passage 8. The first switch solenoid valve 36 and the second switch solenoid valve 37 are not energized and are both in the right working position. At this time, the tenth oil passage 10 and the fourteenth oil passage 14 are connected to the oil tank 31 and disconnected from the eighth oil passage 8 and the fourth oil passage 4. The control oil returns to the oil tank 31 through the first switch solenoid valve 36 and the second switch solenoid valve 37. The eleventh oil passage 11 and the fifteenth oil passage 15 are connected to the oil tank 31 and disconnected from the fourth oil passage 4. At this time, the pressure in the tenth oil passage 10, the fourteenth oil passage 14, the eleventh oil passage 11, and the fifteenth oil passage 15 is 0 bar. Under the action of the spring, the first switching mechanical valve 38 is in the left working position. At this time, the sixteenth oil passage 16 and the first clutch pressure oil passage 52 are connected to the oil tank 31. The pressure in the first clutch pressure oil passage 52 is 0 bar, and the first clutch pressure oil passage 52 is disconnected. Under the action of the spring, the second switching mechanical valve 39 is in the left working position. At this time, the seventeenth oil passage 17 and the second clutch pressure oil passage 53 are connected to the oil tank 31. The pressure in the second clutch pressure oil passage 53 is 0 bar, and the second clutch pressure oil passage 53 is disconnected. Under the action of the spring, the main pressure switching mechanical valve 35 is in the left working position. At this time, the thirteenth oil passage 13 is connected to the oil tank 31, and the thirteenth oil passage 13 is disconnected from the sixth oil passage 6. At this time, the pressure in the thirteenth oil circuit 13 is 0 bar. The pressure at the right feedback end of the main pressure regulating mechanical valve 34 is balanced with the spring force of the main pressure regulating mechanical valve 34, and the main pressure regulating mechanical valve 34 is in the right-hand working position. The third oil circuit 3 is connected to the twelfth oil circuit 12, and the pressure in the working oil in the third oil circuit 3, the fourth oil circuit 4, the fifth oil circuit 5, the sixth oil circuit 6, the seventh oil circuit 7, the eighth oil circuit 8, and the ninth oil circuit 9 is kept at a low pressure value, such as a typical design value of 2.5 bar. In this state, the pressure in the first clutch pressure oil circuit 52 and the second clutch pressure oil circuit 53 is 0 bar, and both the first clutch pressure oil circuit 52 and the second clutch pressure oil circuit 53 are disconnected. The oil pump 33 provides flow to the clutch lubrication oil circuit 51.

[0073] The pressure control of the first clutch pressure oil circuit 52 is as follows: When the hybrid transmission receives a request to enter parallel operation, the first clutch pressure oil circuit 52 needs to be engaged. The second switching solenoid valve 37 is not energized and is in the right working position. At this time, the eleventh oil circuit 11 and the fifteenth oil circuit 15 are connected to the oil tank 31, and the pressure in the eleventh oil circuit 11 is 0 bar. Under the action of the spring, the second switching mechanical valve 39 is moved to the left working position. At this time, the seventeenth oil circuit 17 and the second clutch pressure oil circuit 53 are connected to the oil tank 31, and the pressure in the second clutch pressure oil circuit 53 is 0 bar. When the first solenoid valve 36 is energized, it is in the left working position. At this time, the tenth oil circuit 10 is disconnected from the oil tank 31, and the tenth oil circuit 10, the fourteenth oil circuit 14 are connected to the eighth oil circuit 8 and the fourth oil circuit 4. The working oil from the outlet of the mechanical oil pump 33 enters the first control end 351 of the main pressure switching mechanical valve and the right control end of the first switching mechanical valve 38 through the third oil circuit 3, the fourth oil circuit 4, the eighth oil circuit 8, the tenth oil circuit 10, and the fourteenth oil circuit 14. At this time, the pressure in the fourteenth oil circuit 14 and the tenth oil circuit 10 is 2.5 bar, which is greater than the spring force of the main pressure switching mechanical valve 35 and the first switching mechanical valve 38. The main pressure switching mechanical valve 35 and the first switching mechanical valve 38 are both in the right working position. At this time, the thirteenth oil circuit 13 is connected to the sixth oil circuit 6, and the seventh oil circuit 7 is connected to the sixteenth oil circuit 16. Therefore, the pressure at the left control end of the main pressure regulating mechanical valve 34 and the spring force of the main pressure regulating mechanical valve 34 are balanced with the pressure at its right feedback end. By setting the working area of ​​the left control end of the main pressure regulating mechanical valve 34 to be smaller than the working area of ​​the right feedback end of the main pressure regulating mechanical valve 34, the working position of the main pressure regulating mechanical valve 34 is in the right position. The third oil circuit 3 is connected to the twelfth oil circuit 12, and the pressure in the working oil in the third oil circuit 3 and the fourth oil circuit 4, the fifth oil circuit 5, the sixth oil circuit 6, the seventh oil circuit 7, the eighth oil circuit 8, and the ninth oil circuit 9 is adjusted to a high pressure value, such as a typical design value of 10 bar. Simultaneously, the seventh oil passage 7 is connected to the sixteenth oil passage 16, and the first clutch pressure oil passage 52 is also connected. Working oil begins to enter the first clutch pressure oil passage 52. A first damping orifice 21 is installed in the seventh oil passage 7 to control the oil flow rate of the first clutch pressure oil passage 52. A first accumulator 40 is connected to the first clutch pressure oil passage 52 through the eighteenth oil passage 18 and the sixteenth oil passage 16, effectively reducing the pressure shock of the clutch. After a certain period of time, the pressure in the first clutch pressure oil passage 52 reaches the target of 10 bar, and the first clutch pressure oil passage 52 engages. Therefore, the pressure of the working oil in the third oil passage 3, fourth oil passage 4, fifth oil passage 5, sixth oil passage 6, seventh oil passage 7, eighth oil passage 8, ninth oil passage 9, and first clutch pressure oil passage 52 is controlled by the first switching solenoid valve 36. In this state, the pressure in the first clutch pressure oil passage 52 is 10 bar, and the first clutch pressure oil passage 52 is in the engaged state.Oil pump 33 provides pressure to the first clutch pressure oil circuit 52 and provides flow to the clutch lubrication oil circuit 51.

[0074] The pressure control of the second clutch pressure oil circuit 53 is as follows: When the hybrid transmission receives a request to enter parallel operation, the second clutch pressure oil circuit 53 needs to be engaged. The first switching solenoid valve 36 is not energized and is in the right working position. At this time, the tenth oil circuit 10 and the fourteenth oil circuit 14 are connected to the oil tank 31, and the pressure in the tenth oil circuit 10 is 0 bar. Under the action of the spring, the first switching mechanical valve 38 is moved to the left working position. At this time, the sixteenth oil circuit 16 and the first clutch pressure oil circuit 52 are connected to the oil tank 31, and the pressure in the first clutch pressure oil circuit 52 is 0 bar. When the second solenoid valve 37 is energized, it is in the left working position. At this time, the eleventh oil circuit 11 is disconnected from the oil tank 31, and the eleventh oil circuit 11, the fifteenth oil circuit 15 and the fourth oil circuit 4 are connected. The working oil from the outlet of the mechanical oil pump 33 enters the second control terminal 352 of the main pressure switching mechanical valve and the control terminal of the second switching mechanical valve 39 through the third oil circuit 3, the fourth oil circuit 4, the eleventh oil circuit 11 and the fifteenth oil circuit 15. At this time, the pressure in the fifteenth oil circuit 15 and the eleventh oil circuit 11 is 2.5 bar, which is greater than the spring force of the main pressure switching mechanical valve 35 and the second switching mechanical valve 39. The main pressure switching mechanical valve 35 and the second switching mechanical valve 39 are both in the right working position. At this time, the thirteenth oil circuit 13 is connected to the sixth oil circuit 6, and the ninth oil circuit 9 is connected to the seventeenth oil circuit 17. Therefore, the pressure at the left control end of the main pressure regulating mechanical valve 34 and the spring force of the main pressure regulating mechanical valve 34 are balanced with the pressure at its right feedback end. By setting the working area of ​​the left control end of the main pressure regulating mechanical valve 34 to be smaller than the working area of ​​the right feedback end of the main pressure regulating mechanical valve 34, the working position of the main pressure regulating mechanical valve 34 is in the right position. The third oil circuit 3 is connected to the twelfth oil circuit 12, and the pressure in the working oil in the third oil circuit 3 and the fourth oil circuit 4, the fifth oil circuit 5, the sixth oil circuit 6, the seventh oil circuit 7, the eighth oil circuit 8, and the ninth oil circuit 9 is adjusted to a high pressure value, such as a typical design value of 10 bar. Simultaneously, the ninth oil passage 9 connects to the seventeenth oil passage 17 and the second clutch pressure oil passage 53, allowing working oil to enter the second clutch pressure oil passage 53. A second damping orifice 22 is installed in the ninth oil passage 9 to control the oil flow rate in the second clutch pressure oil passage 53. A second accumulator 41 is connected to the second clutch pressure oil passage 53 via the nineteenth oil passage 19 and the seventeenth oil passage 17, effectively reducing clutch pressure shock. After a certain period, the pressure in the second clutch pressure oil passage 53 reaches the target of 10 bar, and the second clutch pressure oil passage 53 engages. Therefore, the pressure of the working oil in the third oil passage 3, fourth oil passage 4, fifth oil passage 5, sixth oil passage 6, seventh oil passage 7, eighth oil passage 8, ninth oil passage 9, and second clutch pressure oil passage 53 is controlled by the second switching solenoid valve 37. In this state, the pressure in the second clutch pressure oil passage 53 is 10 bar, and the second clutch pressure oil passage 53 is in the engaged state.Oil pump 33 provides pressure to the second clutch pressure oil circuit 53 and provides flow to the clutch lubrication oil circuit 51.

[0075] like Figure 2 The diagram shown is a structural diagram of a hybrid hydraulic control system where one solenoid valve controls one clutch. Because the number of clutches controlled by the system is reduced, compared to the first structure (as shown in the diagram), the system... Figure 1 The second structure (such as) Figure 2 The following components have been reduced: the eighth oil passage (8), the ninth oil passage (9), the eleventh oil passage (11), the fifteenth oil passage (15), the seventeenth oil passage (17), the nineteenth oil passage (19), the second damping orifice (22), the second switching solenoid valve (37), the second switching mechanical valve (39), the second accumulator (41), the second clutch pressure oil passage (53), and the second control terminal (352) of the main pressure switching mechanical valve. Additionally, the oil inlet of the first switching solenoid valve (36) is directly connected to the fourth oil passage (4). The connection relationships of other components are the same as the first structure (e.g., ...). Figure 1 )same.

[0076] like Figure 3 The diagram shown is a simplified structural diagram of a hybrid hydraulic control system where a solenoid valve controls a clutch, compared to the second structure (as shown). Figure 2 The third structure (such as) Figure 3 The main pressure switching mechanical valve 35, the first control terminal 351 of the main pressure switching mechanical valve, and the sixth oil circuit 6 and the fourteenth oil circuit 14 have been reduced. In addition, the thirteenth oil circuit 13 is connected to the tenth oil circuit 10. The connection relationship of other components is the same as that of the second set of structures (such as...). Figure 2 )same.

[0077] Figure 2 This is a structural diagram of a hybrid hydraulic control system where a solenoid valve controls a clutch. Compared to the first structure (such as...),... Figure 1 The second structure (such as) Figure 2 In the second system (e.g., the number of clutches controlled is reduced to one; the system only controls the pressure oil circuit 52 of the first clutch), and the second structure (e.g.) Figure 2 The control principle and process of ) are the same as the first set of structures (such as Figure 1 The same applies. At this time, the hydraulic control system includes: a controller; an oil tank 31 and an oil pump 33 connected thereto; and a single clutch arranged between the generator and the drive motor of the hybrid vehicle, the single clutch having a clutch lubrication oil passage 51 (corresponding to...). Figure 3 (cooling and lubrication) and a first clutch pressure oil circuit 52 (corresponding to) Figure 3The clutch 1 pressure); a first switching solenoid valve 36, which has two oil inlets and one oil outlet, one oil inlet of the first switching solenoid valve 36 is connected to the oil tank 31, and the other oil inlet is connected to the oil pump 33; a first switching mechanical valve 38, which has two oil inlets and one oil outlet, one oil inlet of the first switching mechanical valve 38 is connected to the oil tank 31, and the other oil inlet is connected to the oil pump 33, and the oil outlet of the first switching mechanical valve 38 is connected to the clutch pressure oil circuit; a main pressure regulating mechanical valve 34, which has one oil inlet and one oil outlet, the oil inlet of the main pressure regulating mechanical valve 34 is connected to the oil pump 33, the oil outlet of the main pressure regulating mechanical valve 34 is connected to the clutch lubrication oil circuit 51, and the feedback end of the main pressure regulating mechanical valve 34 is connected to the oil pump 33; the first switching The oil outlet of the solenoid valve 36 is connected to the control terminal of the first switching mechanical valve 38; the main pressure switching mechanical valve 35 has two oil inlets and one oil outlet, one oil inlet of the main pressure switching mechanical valve 35 is connected to the oil tank 31, and the other oil inlet is connected to the oil pump 33; the oil outlet of the main pressure switching mechanical valve 35 is connected to the control terminal of the main pressure regulating mechanical valve 34, and the control terminal of the main pressure switching mechanical valve 35 is connected to the oil outlet of the first switching solenoid valve 36, so as to realize the indirect connection between the control terminal of the main pressure regulating mechanical valve 34 and the oil outlet of the first switching solenoid valve 36; the controller controls the first switching solenoid valve 36 to regulate the oil supply pressure entering the first clutch pressure oil circuit 52, so as to realize the engagement or disengagement control of the single clutch.

[0078] Figure 3 This is a simplified structural diagram of a hybrid hydraulic control system where one solenoid valve controls one clutch. Compared to the second structure (such as...) Figure 2 The third structure (such as) Figure 3 The main pressure switching mechanical valve 35, the first control terminal 351 of the main pressure switching mechanical valve, and the sixth oil circuit 6 and the fourteenth oil circuit 14 are reduced. Additionally, the thirteenth oil circuit 13 is connected to the tenth oil circuit 10. At this time, the hydraulic control system includes: a controller; an oil tank 31 and an oil pump 33 connected thereto; and a single clutch arranged between the generator and the drive motor of the hybrid vehicle, the single clutch having a clutch lubrication oil circuit 51 (corresponding to...). Figure 3 (cooling and lubrication) and a first clutch pressure oil circuit 52 (corresponding to) Figure 3The clutch 1 pressure); a first switching solenoid valve 36, which has two oil inlets and one oil outlet, one oil inlet of the first switching solenoid valve 36 is connected to the oil tank 31, and the other oil inlet is connected to the oil pump 33; a first switching mechanical valve 38, which has two oil inlets and one oil outlet, one oil inlet of the first switching mechanical valve 38 is connected to the oil tank 31, the other oil inlet is connected to the oil pump 33, and the oil outlet of the first switching mechanical valve 38 is connected to the clutch pressure oil circuit; a main pressure regulating mechanical valve 34, which has one oil inlet and one oil outlet. The inlet of the main pressure regulating mechanical valve 34 is connected to the oil pump 33, the outlet of the main pressure regulating mechanical valve 34 is connected to the clutch lubrication oil circuit 51, and the feedback end of the main pressure regulating mechanical valve 34 is connected to the oil pump 33; the outlet of the first switching solenoid valve 36 and the control end of the first switching mechanical valve 38 are connected to the control end of the main pressure regulating mechanical valve 34; the controller controls the first switching solenoid valve 36 to regulate the oil supply pressure entering the first clutch pressure oil circuit 52, so as to realize the engagement or disengagement control of the single clutch.

[0079] When the hybrid transmission is in series mode, the clutch is not engaged, and the oil pump 33 is engaged. The working oil in the oil tank 31 passes through the first oil passage 1 and the filter 32, entering the inlet of the oil pump 33. The working oil from the outlet of the oil pump 33 enters the right feedback terminal of the main pressure regulating mechanical valve 34 through the third oil passage 3, the fourth oil passage 4, and the fifth oil passage 5. The working oil from the outlet of the oil pump 33 also enters the inlet of the first switching solenoid valve 36 through the third oil passage 3 and the fourth oil passage 4. The first switching solenoid valve 36 is not energized and is in the right-side working position. At this time, the tenth oil passage 10 and the thirteenth oil passage 13 are connected to the oil tank 31, and the pressure in the tenth oil passage 10 and the thirteenth oil passage 13 is 0 bar. Under the spring action of the first switching mechanical valve 38, the first switching mechanical valve 38 is in the left-side working position. At this time, the sixteenth oil passage 16 and the first clutch pressure oil passage 52 are connected to the oil tank 31, and the pressure in the first clutch pressure oil passage 52 is 0 bar, meaning the first clutch pressure oil passage 52 is in the disengaged state. The pressure at the right feedback end of the main pressure regulating mechanical valve 34 is balanced with the spring force of the main pressure regulating mechanical valve 34, and the main pressure regulating mechanical valve 34 is in the right-hand working position. The third oil circuit 3 is connected to the twelfth oil circuit 12, and the working oil pressure in the third oil circuit 3, the fourth oil circuit 4, the fifth oil circuit 5, and the seventh oil circuit 7 maintains a low pressure value, typically 2.5 bar. In this state, the pressure in the first clutch pressure oil circuit 52 is 0 bar, the first clutch pressure oil circuit 52 is disconnected, and the oil pump 33 provides flow to the clutch lubrication oil circuit 51.

[0080] The pressure control of the first clutch pressure oil circuit 52 is required when the hybrid transmission receives a request to enter parallel operation and the first clutch pressure oil circuit 52 needs to be engaged. When the first solenoid valve 36 is energized, it is in the left working position. At this time, the tenth oil circuit 10, the thirteenth oil circuit 13 and the fourth oil circuit 4 are connected. The working oil from the outlet of the mechanical oil pump 33 enters the control end of the first switching mechanical valve 38 and the main pressure regulating mechanical valve 34 through the third oil circuit 3, the fourth oil circuit 4, the tenth oil circuit 10 and the thirteenth oil circuit 13. At this time, the pressure in the thirteenth oil circuit 13 and the tenth oil circuit 10 is 2.5 bar, which is greater than the spring force of the first switching mechanical valve 38. The first switching mechanical valve 38 is in the right working position. At this time, the seventh oil circuit 7 and the sixteenth oil circuit 16 are connected, and the first clutch pressure oil circuit 52 is connected. The working oil begins to enter the first clutch pressure oil circuit 52. The first damping orifice 21 is set in the seventh oil circuit 7 to control the oil flow rate of the first clutch pressure oil circuit 52. The first accumulator 40 is set to connect to the first clutch pressure oil circuit 52 through the eighteenth oil circuit 18 and the sixteenth oil circuit 16 to effectively reduce the pressure shock of the clutch. Simultaneously, the pressure at the left control end of the main pressure regulating mechanical valve 34 and the spring force of the main pressure regulating mechanical valve 34 are balanced with the pressure at its right feedback end. By setting the working area of ​​the left control end of the main pressure regulating mechanical valve 34 to be smaller than the working area of ​​the right feedback end, the main pressure regulating mechanical valve 34 is in the right position. The third oil circuit 3 is connected to the twelfth oil circuit 12, and the pressure of the working oil in the third oil circuit 3, the fourth oil circuit 4, the fifth oil circuit 5, and the seventh oil circuit 7 is adjusted to a high pressure value, such as a typical design value of 10 bar. After a certain period of time, the pressure in the first clutch pressure oil circuit 52 reaches the target of 10 bar, and the first clutch pressure oil circuit 52 is engaged. Therefore, the pressure of the working oil in the third oil circuit 3, the fourth oil circuit 4, the fifth oil circuit 5, the seventh oil circuit 7, and the first clutch pressure oil circuit 52 is controlled by the first switch solenoid valve 36. In this state, the pressure in the first clutch pressure oil circuit 52 is 10 bar, and the first clutch pressure oil circuit 52 is in the engaged state. Oil pump 33 provides pressure to the first clutch pressure oil circuit 52 and provides flow to the clutch lubrication oil circuit 51.

[0081] In summary, regarding Figure 3 When the system determines that the hybrid vehicle is in series drive mode, the controller controls the oil outlet of the switching solenoid valve and the oil tank to be connected, so that the main pressure regulating mechanical valve connects the oil pump and the clutch lubrication oil circuit, and the switching mechanical valve connects the clutch pressure oil circuit and the oil tank, so that the oil supply pressure entering the clutch pressure oil circuit is 0 bar, thereby realizing the disengagement of the single clutch.

[0082] When the hybrid vehicle is in parallel drive mode, the controller controls the oil outlet of the solenoid valve and the oil pump to be turned on, so that the main pressure regulating mechanical valve turns on the oil pump and the clutch lubrication oil circuit, and the switching mechanical valve turns on the clutch pressure oil circuit and the oil pump, so that the oil supply pressure entering the clutch pressure oil circuit is a preset high pressure (10 bar), thus realizing the engagement of the single clutch.

[0083] This invention uses one solenoid valve to control the oil supply pressure of the clutch pressure circuit of one clutch, and two solenoid valves to control the oil supply pressure of the clutch pressure circuits of two clutches, thus meeting the needs of single-speed and two-speed hybrid transmissions. Compared with traditional hydraulic systems, it reduces the use of at least one solenoid valve, further simplifying the hydraulic system structure and reducing costs.

Claims

1. A hydraulic control system for a hybrid transmission, characterized by, The hydraulic control system comprises: a controller; an oil tank and an oil pump connected thereto; a single clutch arranged between a generator and a drive motor of a hybrid vehicle, the single clutch having a clutch lubricating oil passage and a clutch pressure oil passage; a switching solenoid valve having two inlet ports and an outlet port, one of the inlet ports of the switching solenoid valve being connected to the oil tank and the other being connected to the oil pump; a switching mechanical valve having two inlet ports and an outlet port, one of the inlet ports of the switching mechanical valve being connected to the oil tank and the other being connected to the oil pump, the outlet port of the switching mechanical valve being connected to the clutch pressure oil passage; a main pressure regulating mechanical valve having one inlet port and one outlet port, the inlet port of the main pressure regulating mechanical valve being connected to the oil pump, the outlet port of the main pressure regulating mechanical valve being connected to the clutch lubricating oil passage, a feedback end of the main pressure regulating mechanical valve being connected to the oil pump; the outlet port of the switching solenoid valve being connected to a control end of the switching mechanical valve and a control end of the main pressure regulating mechanical valve; the controller controlling the switching solenoid valve to selectively connect the outlet port of the switching solenoid valve to the oil tank or the oil pump to synchronously regulate the supply pressure of the clutch pressure oil passage and the pressure of the clutch lubricating oil passage, thereby realizing the engagement or disengagement control of the single clutch.

2. The hydraulic control system of a hybrid transmission according to claim 1, characterized by, The hydraulic control system further comprises: a main pressure switching mechanical valve having two inlet ports and an outlet port, one of the inlet ports of the main pressure switching mechanical valve being connected to the oil tank and the other being connected to the oil pump; the outlet port of the main pressure switching mechanical valve being connected to the control end of the main pressure regulating mechanical valve, and the control end of the main pressure switching mechanical valve being connected to the outlet port of the switching solenoid valve to indirectly connect the control end of the main pressure regulating mechanical valve to the outlet port of the switching solenoid valve.

3. The hydraulic control system of a hybrid transmission according to claim 1, characterized by, The hydraulic control system further comprises: an accumulator connected to an oil passage between the switching mechanical valve and the clutch pressure oil passage.

4. The hydraulic control system of the hybrid transmission according to claim 1, wherein a damping hole is arranged in an oil passage between the switching mechanical valve and the oil pump.

5. A hydraulic control system for a hybrid transmission, characterized by, The hydraulic control system comprises: a controller; an oil tank and an oil pump connected thereto; a double clutch arranged between a generator and a drive motor of a hybrid vehicle, the double clutch having a clutch lubricating oil passage and two clutch pressure oil passages; two switching solenoid valves, each of the switching solenoid valves having two inlet ports and an outlet port, one of the inlet ports of each of the switching solenoid valves being connected to the oil tank and the other being connected to the oil pump; two switching mechanical valves, each of the switching mechanical valves having two inlet ports and an outlet port, one of the inlet ports of each of the switching mechanical valves being connected to the oil tank and the other being connected to the oil pump, the outlet port of each of the switching mechanical valves being connected to one of the clutch pressure oil passages; a main pressure regulating mechanical valve having one inlet port and one outlet port, the inlet port of the main pressure regulating mechanical valve being connected to the oil pump, the outlet port of the main pressure regulating mechanical valve being connected to the clutch lubricating oil passage, a feedback end of the main pressure regulating mechanical valve being connected to the oil pump; A main pressure switching mechanical valve has two oil inlets, one oil outlet and two control ends, one of the oil inlets is communicated to an oil tank, the other oil inlet is communicated to an oil pump, the oil outlet of the main pressure switching mechanical valve is communicated to the control end of the main pressure regulating mechanical valve; The oil outlets of the switch electromagnetic valves are respectively communicated to the control ends of the switching mechanical valves and the control end of the main pressure switching mechanical valve, so that the on-off control of the corresponding clutch pressure oil path and the on-off control of the clutch lubricating oil path are realized by the on-off synchronization of the same switch electromagnetic valve. The controller controls the switch electromagnetic valves to regulate the oil supply pressure in the clutch pressure oil path, so as to realize the combination or disconnection control of the double clutch.

6. The hydraulic control system of a hybrid transmission according to claim 5, characterized by, The hydraulic control system further comprises: An accumulator is arranged on the oil path between the switching mechanical valve and the clutch pressure oil path.

7. The hydraulic control system of the hybrid transmission according to claim 5, wherein A damping hole is arranged on the oil path between the switching mechanical valve and the oil pump.

8. A control method of a hydraulic control system of a hybrid transmission, applied to the hydraulic control system of the hybrid transmission according to any one of claims 1 to 4, characterized by, The control method of the hydraulic control system comprises: When it is determined that the hybrid vehicle is in the series driving mode, the controller controls the oil outlets of the switch electromagnetic valves and the oil tank to be conducted, controls the main pressure regulating mechanical valve to conduct the oil pump and the clutch lubricating oil path, controls the switching mechanical valve to conduct the clutch pressure oil path and the oil tank, controls the oil supply pressure in the clutch pressure oil path to be 0 bar, and realizes the disconnection of the single clutch. When it is determined that the hybrid vehicle is in the parallel driving mode, the controller controls the oil outlets of the switch electromagnetic valves and the oil pump to be conducted, controls the main pressure regulating mechanical valve to conduct the oil pump and the clutch lubricating oil path, controls the switching mechanical valve to conduct the clutch pressure oil path and the oil pump, controls the oil supply pressure in the clutch pressure oil path to be a preset high pressure, and realizes the combination of the single clutch.

9. A control method of a hydraulic control system of a hybrid transmission, applied to the hydraulic control system of the hybrid transmission according to any one of claims 5 to 7, characterized by, The control method of the hydraulic control system comprises: When it is determined that the hybrid vehicle is in the series driving mode, the controller controls the oil outlets of the switch electromagnetic valves and the oil tank to be conducted, controls the main pressure regulating mechanical valve to conduct the oil pump and the clutch lubricating oil path, controls the switching mechanical valve to conduct the clutch pressure oil path and the oil tank, controls the oil supply pressure in the clutch pressure oil path to be 0 bar, and realizes the disconnection of the single clutch. When it is determined that the hybrid vehicle is in the parallel driving mode and it is determined that one of the double clutches needs to be combined, the controller controls the oil outlets of the switch electromagnetic valves corresponding to the target clutch and the oil pump to be conducted, controls the main pressure regulating mechanical valve to conduct the oil pump and the clutch lubricating oil path, controls the switching mechanical valve corresponding to the target clutch to conduct the clutch pressure oil path and the oil pump, controls the oil supply pressure in the clutch pressure oil path corresponding to the target clutch to be a preset high pressure, and realizes the combination of the target clutch; at the same time, the controller also controls the oil outlets of the switch electromagnetic valves corresponding to the remaining clutches and the oil tank to be conducted, controls the switching mechanical valve corresponding to the remaining clutches to conduct the clutch pressure oil path and the oil tank, and controls the oil supply pressure in the clutch pressure oil path corresponding to the remaining clutches to be 0 bar, and realizes the disconnection of the remaining clutches.

10. A vehicle characterized by comprising: A hydraulic control system for a hybrid transmission according to any one of claims 1 to 4 or a hydraulic control system for a hybrid transmission according to any one of claims 5 to 7.

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