Hydraulic control system of two-gear hybrid power transmission

Abstract

The utility model relates to a hydraulic control system of a two-gear hybrid power transmission, which is characterized in that a pump source system is connected with a main oil way pressure regulating loop, and the main oil way pressure regulating loop controls double-pump confluence and controls the pressure of a main oil way; the pump source system is connected with a cooling and lubricating loop; the cooling and lubricating loop controls cooling and lubricating of parts in the transmission system; the pump source system provides mutual adjustment of pressure and flow for the main oil way pressure adjusting loop and the cooling and lubricating loop. The transmission hydraulic control system has a multi-gear working mode, control requirements under different working conditions can be met, system pressure and flow supply are adjusted according to needs, and low energy consumption is achieved. The control characteristics of the hydraulic control system under different working conditions are improved, the energy consumption of the hydraulic control system under different working conditions is reduced, and the problems that in the design of a current hydraulic control system, flow cannot be adjusted according to needs, energy consumption is high, adjustment and control are complex, energy consumption is high, the structure is complex, and cost is high are solved.

Description

Technical Field

[0001] The embodiments of this utility model relate to a hydraulic control system for a two-speed hybrid transmission, which belongs to the field of new energy. Background Technology

[0002] Hybrid drive technology, as a highly efficient, energy-saving, and environmentally friendly solution, is gradually being applied and promoted in the commercial vehicle sector. Different power drive routes are used in different operating modes, requiring key components to switch according to the drive route. This results in varying demands on the control pressure and cooling / lubrication flow of the hybrid transmission in different operating modes. Current hydraulic control system designs either cannot adjust flow as needed, leading to high energy consumption, or are complex to adjust and control, resulting in high energy consumption, complex structure, and high cost, making it difficult to meet the demands of commercial vehicles for efficient transmission and economy.

[0003] Against this backdrop, there is a need to propose a hydraulic control system for a two-speed hybrid transmission that combines low energy consumption, low cost, and high safety. By adjusting the flow rate on demand and incorporating safety damping measures, the system achieves both flow regulation requirements and high safety, thereby reducing the energy consumption of the hydraulic control system. Simultaneously, this hydraulic control system has a relatively simple structure, facilitating installation and maintenance, reducing system complexity and manufacturing costs, making it particularly suitable for hybrid transmissions in medium and heavy-duty commercial vehicles. Utility Model Content

[0004] The purpose of this utility model is to provide a hydraulic control system for a two-speed hybrid transmission that combines low energy consumption, low cost, and high safety, achieving multiple working modes, improving the control characteristics of the hydraulic control system under different working conditions, and reducing the energy consumption of the hydraulic control system under different working conditions.

[0005] To achieve the above objectives, the present invention provides a hydraulic control system for a two-speed hybrid transmission, comprising:

[0006] Pump source system;

[0007] A main oil circuit pressure regulating circuit is connected to the pump source system. The main oil circuit pressure regulating circuit controls the confluence of the two pumps and controls the pressure of the main oil circuit.

[0008] A cooling and lubrication circuit is connected to the pump source system; the cooling and lubrication circuit controls the cooling and lubrication flow rate in the transmission system; the pump source system provides mutual regulation of pressure and flow rate for the main oil circuit pressure regulating circuit and the cooling and lubrication circuit. This utility model's transmission hydraulic control system has multiple operating modes, capable of meeting control requirements under different working conditions, adjusting system pressure and flow rate supply as needed, and achieving low energy consumption.

[0009] Furthermore, in the hydraulic control system of the two-speed hybrid transmission described in this utility model, the main oil circuit pressure regulating circuit also includes: a main oil circuit pilot valve, a main oil circuit pressure regulating valve, a main oil circuit damper, and a main oil circuit safety valve.

[0010] The main oil circuit pilot valve is a normally closed two-position three-way valve with pressure feedback function. It has one inlet, one outlet and one return port. The inlet is connected to the main oil circuit of the pump source system, the outlet is connected to the control port of the main oil circuit pressure regulating valve, and the return port is directly connected to the oil pan.

[0011] The main oil circuit pressure regulating valve is a hydraulically controlled normally closed two-position two-way valve with one inlet and one outlet. The inlet of the main oil circuit pressure regulating valve is connected to the main oil circuit, and the outlet of the main oil circuit pressure regulating valve is connected to the cooling and lubrication circuit. The hydraulically controlled port of the main oil circuit pressure regulating valve is connected to the outlet of the main oil circuit pilot valve.

[0012] The main oil circuit vibration damper is installed on the main oil circuit;

[0013] The main oil circuit safety valve is a hydraulically controlled two-position two-way spool valve with one inlet and one outlet. The inlet of the main oil circuit safety valve is connected to the main oil circuit, and the outlet of the main oil circuit safety valve is directly connected to the oil pan.

[0014] Furthermore, in the hydraulic control system of the two-speed hybrid transmission described in this utility model, the cooling and lubrication circuit includes an electromagnetic switch valve, a cooling and lubrication branch, an oil injection pipe, and several throttling orifices; the electromagnetic switch valve mainly controls the cooling of the motor that is not frequently used; the cooling and lubrication branch and the oil injection pipe guide the cooling and lubrication oil to the parts that need cooling and lubrication, and lubricate as needed through the several throttling orifices.

[0015] Furthermore, in the hydraulic control system of the two-speed hybrid transmission described in this utility model, the main oil circuit pilot valve and the main oil circuit pressure regulating valve are combined; the main oil circuit safety valve and the main oil circuit damper are directly connected to the main oil circuit of the pump source system; the combined inlet of the main oil circuit pilot valve and the main oil circuit pressure regulating valve is directly connected to the main oil circuit of the pump source system.

[0016] Furthermore, in the hydraulic control system for the two-speed hybrid transmission described in this utility model, the pump source system further includes:

[0017] The first oil pump is connected to the output shaft of the transmission.

[0018] The second oil pump, which is an electronic oil pump, is not connected to the rotating parts in the transmission.

[0019] Furthermore, in the hydraulic control system of the two-speed hybrid transmission described in this utility model, the first oil pump and the second oil pump share a common connection for suction and filtration; after the pressure filter is connected to the outlet of the first oil pump, it is connected to the clutch pressure regulating circuit.

[0020] Furthermore, in the hydraulic control system of the two-speed hybrid transmission described in this utility model, the clutch pressure regulating circuit further includes:

[0021] First clutch control valve and second clutch control valve, first clutch oil circuit damper and second clutch control valve, first clutch pressure sensor and second clutch pressure sensor.

[0022] The inlets of the first and second clutch control valves are connected to the main oil circuit, and the outlets of the first and second clutch control valves are connected to the inlet oil circuits of the first and second clutch cylinders. Both the first and second clutch control valves have pressure feedback for real-time adjustment of clutch pressure. The pressure relief ports of the first and second clutch control valves are directly connected to the oil pan. A first clutch oil circuit damper and a second clutch oil circuit damper are installed on the inlet oil circuits of the first and second clutch cylinders to absorb pressure fluctuations on the inlet oil circuits of the first and second clutch cylinders. The inlet oil circuits of the first and second clutch cylinders are connected to a first clutch pressure sensor and a second clutch pressure sensor to detect the control pressure of the clutch cylinders in real time.

[0023] Both the first clutch cylinder and the second clutch cylinder are single-acting piston cylinders with only one oil passage. When working, oil enters the first clutch cylinder and the second clutch cylinder through this oil passage. When not working, the oil in the first clutch cylinder and the second clutch cylinder flows out through this oil passage to relieve the load.

[0024] The cooler is a liquid-cooled cooler.

[0025] Furthermore, in the hydraulic control system of the two-speed hybrid transmission described in this utility model, the cooling and lubrication circuit includes an electromagnetic switch valve, a first cooling and lubrication branch, a first oil injection pipe, a first throttle orifice, a second cooling and lubrication branch, a second oil injection pipe, a second throttle orifice, a third cooling and lubrication branch, a third oil injection pipe, a third throttle orifice, a fourth cooling and lubrication branch, a fourth oil injection pipe, and a fourth throttle orifice. The electromagnetic switch valve is installed on the lubrication branch that needs to be controlled. The first oil injection pipe, the second oil injection pipe, the third oil injection pipe, the fourth oil injection pipe, and the first throttle orifice, the second throttle orifice, the third throttle orifice, and the fourth throttle orifice are respectively installed on the first cooling and lubrication branch, the second cooling and lubrication branch, the third cooling and lubrication branch, and the fourth cooling and lubrication branch, respectively, to concentrate and distribute the oil and guide it to the parts that need cooling and lubrication, and then evenly spray the oil onto the parts that need cooling and lubrication.

[0026] Furthermore, in the hydraulic control system of the two-speed hybrid transmission described in this utility model, the cooling and lubrication circuit has multiple lubrication branches, and the multiple lubrication branches can be selected as needed to be equipped with electromagnetic switching valves.

[0027] Compared with the prior art, the implementation of this utility model adopts a method of connecting a main oil circuit pressure regulating circuit to the pump source system. This main oil circuit pressure regulating circuit controls the confluence of the two pumps and controls the main oil circuit pressure. A cooling and lubrication circuit is also connected to the pump source system. This cooling and lubrication circuit controls the cooling and lubrication of components in the transmission system. The main oil circuit pressure regulating circuit and the cooling and lubrication circuit provide mutual regulation of pressure and flow for the pump source system. The transmission hydraulic control system of this utility model has multiple operating modes, which can meet the control requirements under different working conditions. It adjusts the system pressure and flow supply as needed, achieving low energy consumption. Having multiple operating modes improves the control characteristics of the hydraulic control system under different working conditions and reduces the energy consumption of the hydraulic control system under different working conditions. It solves the technical problems of current hydraulic control system designs, which either cannot adjust the flow as needed, resulting in high energy consumption, or have complex adjustment and control, leading to high energy consumption, complex structure, and high cost, making it difficult to meet the technical requirements of commercial vehicles for efficient transmission and economy. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the functional blocks in the schematic diagram of this utility model;

[0029] Figure 2 This is a schematic diagram showing the detailed components of the hydraulic control system for a two-speed hybrid transmission in an embodiment of this utility model.

[0030] Figure 3 This is a schematic diagram of the main oil circuit pressure regulating module of the hydraulic control system for a two-speed hybrid transmission in an embodiment of this utility model.

[0031] Figure 4This is a schematic diagram of the cooling and lubrication circuit of the hydraulic control system for a two-speed hybrid transmission in an embodiment of this utility model. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this utility model clearer, the various embodiments of this utility model will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this utility model to facilitate a better understanding of this application. However, the technical solutions claimed in the claims of this application can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0033] The embodiments of this utility model relate to a hydraulic control system for a two-speed hybrid transmission, such as... Figure 1 As shown, it includes:

[0034] In this embodiment, pump source system 2 provides pressure and flow rate;

[0035] The main oil circuit pressure regulating circuit 5 is connected to the pump source system 2. The main oil circuit pressure regulating circuit 5 controls the confluence of the two pumps and controls the pressure of the main oil circuit.

[0036] The cooling and lubrication circuit 8 is connected to the pump source system 2. The cooling and lubrication circuit 8 controls the cooling and lubrication of components in the transmission system. The pump source system 2 provides mutual regulation of pressure and flow between the main oil circuit pressure regulation circuit 5 and the cooling and lubrication circuit 8. This system can meet the control requirements under different operating conditions, adjusting system pressure and flow supply as needed to achieve low energy consumption. It features multiple operating modes, improving the control characteristics of the hydraulic control system under different operating conditions and reducing its energy consumption. This solves the technical problems of current hydraulic control system designs, which either cannot adjust flow as needed, resulting in high energy consumption, or have complex adjustment and control, leading to high energy consumption, complex structure, and high cost, making it difficult to meet the demands of commercial vehicles for efficient transmission and economy.

[0037] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figure 1 As shown, the main oil circuit pressure regulating circuit 5 also includes: a main oil circuit pilot valve 16, a main oil circuit pressure regulating valve 15, a main oil circuit damper 22, and a main oil circuit safety valve 17.

[0038] The main oil circuit pilot valve 16 is a normally closed two-position three-way valve with pressure feedback function. It has one inlet, one outlet and one return port. The inlet is connected to the main oil circuit of the pump source system 2, the outlet is connected to the control port 15 of the main oil circuit pressure regulating valve, and the return port is directly connected to the oil pan.

[0039] The main oil circuit pressure regulating valve 15 is a hydraulically controlled normally closed two-position two-way valve with one inlet and one outlet. The inlet of the main oil circuit pressure regulating valve 15 is connected to the main oil circuit, and the outlet of the main oil circuit pressure regulating valve 15 is connected to the cooling and lubrication circuit 8. The hydraulically controlled port of the main oil circuit pressure regulating valve 15 is connected to the outlet of the main oil circuit pilot valve 16.

[0040] The main oil circuit damper 22 is installed on the main oil circuit;

[0041] The main oil circuit safety valve 17 is a hydraulically controlled two-position two-way spool valve with one inlet and one outlet. The inlet of the main oil circuit safety valve 17 is connected to the main oil circuit, and the outlet of the main oil circuit safety valve is directly connected to the oil pan.

[0042] The inlet of the main oil circuit pilot valve 16 is connected to the main oil circuit, the inlet of the main oil circuit pressure regulating valve 15 is connected to the main oil circuit, and the outlet of the main oil circuit pilot valve 16 is connected to the control port of the main oil circuit pressure regulating valve 15, used to adjust the valve core opening size of the main oil circuit pressure regulating valve 15; the main oil circuit damper 22 is connected to the main oil circuit to absorb pressure oscillations in the main oil circuit; the inlet of the main oil circuit safety valve 17 is connected to the main oil circuit, and the outlet of the main oil circuit safety valve 17 is directly connected to the oil pan, used to limit the maximum pressure of the main oil circuit;

[0043] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figure 1 As shown, the cooling and lubrication circuit 8 includes an electromagnetic switch valve 21, a cooling and lubrication branch 24, an oil injection pipe 25, and several throttling orifices. The electromagnetic switch valve 21 mainly controls the cooling of motors that are not frequently used. The cooling and lubrication branch 24 and the oil injection pipe 25 guide the cooling and lubrication oil to the parts that need cooling and lubrication, and the several throttling orifices provide lubrication as needed.

[0044] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figure 1 As shown, the main oil circuit pilot valve 16 and the main oil circuit pressure regulating valve 15 are combined; the main oil circuit safety valve 17 and the main oil circuit damper 22 are directly connected to the main oil circuit of the pump source system 2; the inlet of the combination of the main oil circuit pilot valve 16 and the main oil circuit pressure regulating valve 15 is directly connected to the main oil circuit of the pump source system 2. The outlet of the main oil circuit safety valve 17 is directly connected to the oil pan to limit the maximum pressure of the main oil circuit.

[0045] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figures 2-4 As shown, pump source system 2 also includes:

[0046] The first oil pump 10 is connected to the output shaft of the transmission;

[0047] The second oil pump 11 is an electronic oil pump; it is not connected to the rotating parts in the transmission. The first oil pump 10 and the second oil pump 11 constitute the pump source system 2 in this embodiment.

[0048] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figures 2-4 As shown, the first oil pump 10 and the second oil pump 11 share a common connection to the suction filter 9; the outlet of the first oil pump 10 is connected to the pressure filter 19 and then connected to the clutch pressure regulating circuit 6.

[0049] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figures 2-4 As shown, the clutch pressure regulating circuit 6 also includes:

[0050] First clutch control valve 36 and second clutch control valve 40, first clutch oil circuit damper 38 and second clutch control valve 42, first clutch pressure sensor 37 and second clutch pressure sensor 41.

[0051] The inlets of the first clutch control valve 36 and the second clutch control valve 40 are connected to the main oil circuit, and the outlets of the first clutch control valve 36 and the second clutch control valve 40 are connected to the inlet oil circuits of the first clutch cylinder 39 and the second clutch cylinder 43. Both the first clutch control valve 36 and the second clutch control valve 40 are equipped with pressure feedback for real-time adjustment of clutch pressure. The pressure relief ports of the first clutch control valve 36 and the second clutch control valve 40 are directly connected to the oil pan. The first clutch oil circuit damper 38 and the second clutch oil circuit damper 42 are installed on the inlet oil circuits of the first clutch cylinder 39 and the second clutch cylinder 43 to absorb pressure fluctuations on the inlet oil circuits of the first clutch cylinder 39 and the second clutch cylinder 43. The inlet oil circuits of the first clutch cylinder 39 and the second clutch cylinder 43 are connected to the first clutch pressure sensor 37 and the second clutch pressure sensor 41 for real-time detection of the control pressure of the clutch cylinders.

[0052] The first clutch cylinder 39 and the second clutch cylinder 43 are both single-acting piston cylinders with only one oil passage. When working, the oil enters the first clutch cylinder 39 and the second clutch cylinder 43 through this oil passage. When not working, the oil in the first clutch cylinder and the second clutch cylinder flows out through this oil passage to unload.

[0053] Cooler 20 is a liquid-cooled cooler.

[0054] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figures 2-4As shown, the cooling and lubrication circuit 8 includes an electromagnetic switch valve 21, a first cooling and lubrication branch 24, a first oil injection pipe 25, a first throttling orifice 26, a second cooling and lubrication branch 27, a second oil injection pipe 28, a second throttling orifice 29, a third cooling and lubrication branch 30, a third oil injection pipe 31, a third throttling orifice 32, a fourth cooling and lubrication branch 33, a fourth oil injection pipe 34, and a fourth throttling orifice 35. The electromagnetic switch valve 21 is installed on the lubrication branch that needs to be controlled. The first oil injection pipe 25, the second oil injection pipe 28, the third oil injection pipe 31, the fourth oil injection pipe 34, the first throttling orifice 26, the second throttling orifice 29, the third throttling orifice 32, and the fourth throttling orifice 35 are respectively installed on the first cooling and lubrication branch 24, the second cooling and lubrication branch 27, the third cooling and lubrication branch 30, and the fourth cooling and lubrication branch 33. The first injection pipe 25, the second injection pipe 28, the third injection pipe 31, and the fourth injection pipe 34 are used to concentrate and distribute the oil to the parts that require cooling and lubrication, and then spray the oil evenly onto the parts that require cooling and lubrication. The first throttling orifice 26, the second throttling orifice 29, the third throttling orifice 32, and the fourth throttling orifice 35 are used to evenly spray the oil onto the parts that require cooling and lubrication.

[0055] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figures 2-4 As shown, the cooling and lubrication circuit 8 has multiple lubrication branches, and electromagnetic switching valves can be selected as needed for these multiple lubrication branches.

[0056] To achieve the aforementioned technical effects, the hydraulic control system of the two-speed hybrid transmission in this example, such as... Figures 2-4 As shown, the hydraulic control system of the two-speed hybrid transmission in this embodiment can meet the working requirements of the two-speed hybrid drive system in idle charging and energy recovery modes. In idle charging mode, the hydraulic control system of the two-speed hybrid transmission needs to provide cooling and lubrication for the generator motor. In energy recovery mode, the hydraulic control system of the two-speed hybrid transmission needs to provide cooling and lubrication for the generator motor.

[0057] The hydraulic control system of the two-speed hybrid transmission meets the needs of the two-speed power drive system in both pure electric drive and engine direct drive modes. In pure electric drive mode, the hydraulic control system of the two-speed hybrid transmission needs to provide cooling and lubrication for the drive motor. In engine direct drive mode, the hydraulic control system of the two-speed hybrid transmission needs to provide control pressure for the clutch.

[0058] The hydraulic control system of the two-speed hybrid transmission can meet the operating requirements of the series hybrid and parallel hybrid modes of the two-speed hybrid drive system. In series hybrid mode, the hydraulic control system of the two-speed hybrid transmission needs to provide cooling and lubrication for the drive motor, generator motor, and clutch; the hydraulic control system of the two-speed hybrid transmission needs to provide control oil pressure for the engaged clutch. In parallel hybrid mode, the hydraulic control system of the two-speed hybrid transmission needs to provide cooling and lubrication for the drive motor, generator motor, and clutch; the hydraulic control system of the two-speed hybrid transmission needs to provide control oil pressure for the engaged clutch.

[0059] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes can be made to them in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A hydraulic control system for a two-speed hybrid transmission, characterized in that, include: Pump source system; A main oil circuit pressure regulating circuit is connected to the pump source system. The main oil circuit pressure regulating circuit controls the confluence of the two pumps and controls the pressure of the main oil circuit. A cooling and lubrication circuit is connected to the pump source system; the cooling and lubrication circuit controls the cooling and lubrication flow rate in the transmission system; the pump source system provides mutual regulation of pressure and flow rate for the main oil circuit pressure regulating circuit and the cooling and lubrication circuit.

2. The hydraulic control system for a two-speed hybrid transmission according to claim 1, characterized in that, The main oil circuit pressure regulating circuit also includes: a main oil circuit pilot valve, a main oil circuit pressure regulating valve, a main oil circuit damper, and a main oil circuit safety valve; The main oil circuit pilot valve is a normally closed two-position three-way valve with pressure feedback function. It has one inlet, one outlet and one return port. The inlet is connected to the main oil circuit of the pump source system, the outlet is connected to the control port of the main oil circuit pressure regulating valve, and the return port is directly connected to the oil pan. The main oil circuit pressure regulating valve is a hydraulically controlled normally open and closed two-position two-way valve with one inlet and one outlet. The inlet of the main oil circuit pressure regulating valve is connected to the main oil circuit, and the outlet of the main oil circuit pressure regulating valve is connected to the cooling and lubrication circuit. The hydraulically controlled port of the main oil circuit pressure regulating valve is connected to the outlet of the main oil circuit pilot valve. The main oil circuit vibration damper is installed on the main oil circuit; The main oil circuit safety valve is a hydraulically controlled two-position two-way spool valve with one inlet and one outlet. The inlet of the main oil circuit safety valve is connected to the main oil circuit, and the outlet of the main oil circuit safety valve is directly connected to the oil pan.

3. The hydraulic control system for a two-speed hybrid transmission according to claim 1, characterized in that, The cooling and lubrication circuit includes an electromagnetic switch valve, a cooling and lubrication branch, an oil injection pipe, and several throttling orifices. The electromagnetic switch valve mainly controls the cooling of motors that are not frequently used. The cooling and lubrication branch and the oil injection pipe guide the cooling and lubrication oil to the parts that need cooling and lubrication, and lubricate as needed through the several throttling orifices.

4. The hydraulic control system for a two-speed hybrid transmission according to claim 2, characterized in that, The main oil circuit pilot valve and the main oil circuit pressure regulating valve are combined; the main oil circuit safety valve and the main oil circuit damper are directly connected to the main oil circuit of the pump source system; the combined inlet of the main oil circuit pilot valve and the main oil circuit pressure regulating valve is directly connected to the main oil circuit of the pump source system.

5. The hydraulic control system for a two-speed hybrid transmission according to claim 1, characterized in that, The pump source system also includes: The first oil pump is connected to the output shaft of the transmission. The second oil pump, which is an electronic oil pump, is not connected to the rotating parts in the transmission.

6. The hydraulic control system for a two-speed hybrid transmission according to claim 5, characterized in that, The first oil pump and the second oil pump share a common connection for suction filtration; after the first oil pump is connected to the outlet for pressure filtration, it is connected to the clutch pressure regulating circuit.

7. The hydraulic control system for a two-speed hybrid transmission according to claim 6, characterized in that, The clutch pressure regulating circuit also includes: First clutch control valve and second clutch control valve, first clutch oil circuit damper and second clutch control valve, first clutch pressure sensor and second clutch pressure sensor. The inlets of the first and second clutch control valves are connected to the main oil circuit, and the outlets of the first and second clutch control valves are connected to the inlet oil circuits of the first and second clutch cylinders. Both the first and second clutch control valves have pressure feedback for real-time adjustment of clutch pressure. The pressure relief ports of the first and second clutch control valves are directly connected to the oil pan. A first clutch oil circuit damper and a second clutch oil circuit damper are installed on the inlet oil circuits of the first and second clutch cylinders to absorb pressure fluctuations on the inlet oil circuits of the first and second clutch cylinders. The inlet oil circuits of the first and second clutch cylinders are connected to a first clutch pressure sensor and a second clutch pressure sensor to detect the control pressure of the clutch cylinders in real time. Both the first clutch cylinder and the second clutch cylinder are single-acting piston cylinders with only one oil passage. When working, oil enters the first clutch cylinder and the second clutch cylinder through this oil passage. When not working, the oil in the first clutch cylinder and the second clutch cylinder flows out through this oil passage to relieve the load. The cooler is a liquid-cooled cooler.

8. The hydraulic control system for a two-speed hybrid transmission according to claim 3, characterized in that, The cooling and lubrication circuit includes an electromagnetic switch valve, a first cooling and lubrication branch, a first oil injection pipe, a first throttling orifice, a second cooling and lubrication branch, a second oil injection pipe, a second throttling orifice, a third cooling and lubrication branch, a third oil injection pipe, and a third throttling orifice. The electromagnetic switch valve is installed on the lubrication branch that needs to be controlled. The first, second, third, and third cooling and lubrication branches are respectively equipped with a first oil injection pipe, a second oil injection pipe, a third oil injection pipe, a third oil injection pipe, a first throttling orifice, a second throttling orifice, and a third throttling orifice, which are used to centrally distribute and guide the oil to the parts that need cooling and lubrication, and then evenly spray the oil onto the parts that need cooling and lubrication.

9. The hydraulic control system for a two-speed hybrid transmission according to claim 8, characterized in that, The cooling and lubrication circuit has multiple lubrication branches, and electromagnetic switching valves can be selected for each of these multiple lubrication branches as needed.

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