Hydraulic control system of two-gear hybrid power transmission

Abstract

The invention 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 is used for controlling double-pump confluence and controlling 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 embodiment of the present invention relates to the field of new energy, and in particular to a two-speed hybrid transmission hydraulic control system. Background Art

[0002] As an efficient energy-saving and environmentally friendly solution, hybrid drive technology has gradually been applied and promoted in the field of commercial vehicles. In different working modes, different power drive routes are adopted, and the main working parts need to be switched according to the drive route, so that the control pressure and cooling and lubrication flow of the hybrid transmission have different requirements in different working modes. The current hydraulic control system design either cannot adjust the flow on demand, with high energy consumption, or the adjustment and control are complex, with high energy consumption, complex structure, high cost and other problems, which makes it difficult to meet the commercial vehicle's demand for efficient transmission and economy.

[0003] In this context, it is necessary to propose a two-speed hybrid transmission hydraulic control system with low energy consumption, low cost and high safety. By adjusting the flow rate on demand and setting safety vibration reduction measures, the flow regulation requirements and high safety can be achieved, thereby reducing the energy consumption of the hydraulic control system. At the same time, this hydraulic control system has a relatively simple structure, is easy to install and maintain, reduces system complexity and manufacturing costs, and is particularly suitable for hybrid transmissions of medium and heavy-duty commercial vehicles. Summary of the invention

[0004] The purpose of the implementation mode of the present invention is to provide a two-speed hybrid transmission hydraulic control system with low energy consumption, low cost and high safety, to achieve multiple working modes, to improve the control characteristics of the hydraulic control system under different working conditions, and to reduce the energy consumption of the hydraulic control system under different working conditions.

[0005] In order to achieve the above object, the embodiment of the present invention designs a two-speed hybrid transmission hydraulic control system, including:

[0006] Pump source system;

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

[0008] A cooling and lubricating circuit is connected to the pump source system; the cooling and lubricating circuit controls the cooling and lubricating flow of parts in the transmission system; the pump source system provides mutual regulation of pressure and flow for the main oil circuit pressure regulating circuit and the cooling and lubricating circuit. The transmission hydraulic control system of the present invention has a multi-speed working mode, which can meet the control requirements under different working conditions, adjust the system pressure and flow supply as needed, and achieve low energy consumption.

[0009] Further, in the two-speed hybrid transmission hydraulic control system of the present invention, the main oil circuit pressure regulating circuit further comprises: 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 type with a pressure feedback function, having an inlet, an outlet and an oil 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 oil 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 type, having an inlet and an 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 lubrication circuit; the hydraulic control 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 shock absorber is installed on the main oil circuit;

[0013] The main oil circuit safety valve is a hydraulically controlled two-position two-way sliding valve having an inlet and an 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 two-speed hybrid transmission hydraulic control system described in the present invention, the cooling and lubrication circuit includes an electromagnetic switch valve, a cooling and lubrication branch, an oil injection pipe and a plurality of throttle holes; 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 direct the cooling and lubricating oil to the parts that require cooling and lubrication, and perform on-demand lubrication through a plurality of the throttle holes.

[0015] Further, in the two-speed hybrid transmission hydraulic control system described in the present invention, 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 shock absorber 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 two-speed hybrid transmission hydraulic control system of the present invention, the pump source system further includes:

[0017] A first oil pump, wherein the first oil pump is connected to the transmission output shaft;

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

[0019] Furthermore, in the two-speed hybrid transmission hydraulic control system described in the present invention, the first oil pump and the second oil pump are commonly connected to a suction filter; the outlet of the first oil pump is connected to a pressure filter and then to a clutch pressure regulating circuit.

[0020] Furthermore, in the two-speed hybrid transmission hydraulic control system of the present invention, the clutch pressure regulating circuit further includes:

[0021] a first clutch control valve and a second clutch control valve, a first clutch oil circuit damper and a second clutch control valve, a first clutch pressure sensor and a second clutch pressure sensor;

[0022] The inlet of the first clutch control valve and the second clutch control valve is connected to the main oil circuit, the outlet of the first clutch control valve and the second clutch control valve is connected to the inlet oil circuit of the first clutch oil cylinder and the second clutch oil cylinder, the first clutch control valve and the second clutch control valve are both provided with pressure feedback for real-time adjustment of the clutch pressure, and the pressure relief ports of the first clutch control valve and the second clutch control valve are directly connected to the oil pan; the first clutch oil circuit damper and the second clutch oil circuit damper are installed on the inlet oil circuit of the first clutch oil cylinder and the second clutch oil cylinder for absorbing the pressure fluctuation on the inlet oil circuit of the first clutch oil cylinder and the second clutch oil cylinder; the inlet oil circuit of the first clutch oil cylinder and the second clutch oil cylinder is connected to the first clutch pressure sensor and the second clutch pressure sensor for real-time detection of the control pressure of the clutch oil cylinder;

[0023] The first clutch oil cylinder and the second clutch oil cylinder are both single-acting piston cylinders, and have only one oil passage. When working, the oil enters the first clutch oil cylinder and the second clutch oil cylinder through the oil passage. When not working, the oil in the first clutch oil cylinder and the second clutch oil cylinder flows out through the oil passage to unload.

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

[0025] Further, in the two-speed hybrid transmission hydraulic control system described in the present invention, the cooling and lubrication circuit includes an electromagnetic switch valve, a first cooling and lubrication branch, a first oil spray pipe, a first throttle hole, a second cooling and lubrication branch, a second oil spray pipe, a second throttle hole, a third cooling and lubrication branch, a third oil spray pipe, a third throttle hole, a fourth cooling and lubrication branch, a fourth oil spray pipe, and a fourth throttle hole. The electromagnetic switch valve is installed on the lubrication branch that needs to be controlled; the first oil spray pipe, the second oil spray pipe, the third oil spray pipe, the fourth oil spray pipe and the first throttle hole, the second throttle hole, the third throttle hole, and the fourth throttle hole 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, so as to distribute and guide the oil to the parts that need cooling and lubrication, and then evenly spray the oil to the parts that need cooling and lubrication.

[0026] Furthermore, in the two-speed hybrid transmission hydraulic control system described in the present invention, the cooling lubrication circuit has multiple lubrication branches, and the multiple lubrication branches can be provided with electromagnetic switch valves as required.

[0027] Furthermore, in the two-speed hybrid transmission hydraulic control system described in the present invention, the two-speed hybrid transmission hydraulic control system can meet the idle charging and energy recovery mode working requirements of the two-speed hybrid drive system; in the idle charging mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the generator motor; in the energy recovery mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the generator motor.

[0028] The two-speed hybrid transmission hydraulic control system meets the working requirements of the pure electric drive and engine direct drive modes of the two-speed power drive system; in the pure electric drive mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor; in the engine direct drive mode, the two-speed hybrid transmission hydraulic control system needs to provide control pressure for the clutch.

[0029] The two-speed hybrid transmission hydraulic control system can meet the working requirements of the series hybrid and parallel hybrid modes of the two-speed hybrid drive system; in the series hybrid mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor, the generator motor, and the clutch; the two-speed hybrid transmission hydraulic control system needs to provide control oil pressure for the engaged clutch; in the parallel hybrid mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor, the generator motor, and the clutch; the two-speed hybrid transmission hydraulic control system needs to provide control oil pressure for the engaged clutch.

[0030] Compared with the prior art, the implementation method of the present invention adopts a main oil circuit pressure regulating circuit connected to the pump source system, and the main oil circuit pressure regulating circuit controls the confluence of the two pumps and controls the main oil circuit pressure; a cooling lubrication circuit is connected to the pump source system; the cooling lubrication circuit controls the cooling and lubrication of the parts in the transmission system; the main oil circuit pressure regulating circuit and the cooling lubrication circuit provide mutual regulation of pressure and flow for the pump source system. The transmission hydraulic control system of the present invention has a multi-speed working mode, which can meet the control requirements under different working conditions, adjust the system pressure and flow supply as needed, and achieve low energy consumption. It has multiple working modes, improves the control characteristics of the hydraulic control system under different working conditions, reduces the energy consumption of the hydraulic control system under different working conditions, and solves the current hydraulic control system design. Either the flow cannot be adjusted as needed, the energy consumption is high, or the adjustment and control are complex, there are problems such as high energy consumption, complex structure, and high cost, and it is difficult to meet the technical problems of commercial vehicles for efficient transmission and economy. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a schematic diagram of the functional blocks of the principle diagram in the present invention;

[0032] Figure 2 It is a schematic diagram of the components of the principle diagram of the hydraulic control system of a two-speed hybrid transmission in an embodiment of the present invention;

[0033] Figure 3 It is a schematic diagram of a main oil circuit pressure regulating module of a two-speed hybrid transmission hydraulic control system in an embodiment of the present invention;

[0034] Figure 4 It is a schematic diagram of a cooling and lubrication circuit of a hydraulic control system of a two-speed hybrid transmission in an embodiment of the present invention. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention clearer, the following will be described in detail with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the various embodiments of the present invention, many technical details are provided in order to enable the reader to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed for protection in the claims of the present application can be implemented.

[0036] The embodiment of the present invention relates to a two-speed hybrid transmission hydraulic control system, such as Figure 1 As shown, including:

[0037] The pump source system 2 in this embodiment provides pressure and flow;

[0038] A main oil circuit pressure regulating circuit 5 is connected to the pump source system 2, and the main oil circuit pressure regulating circuit 5 controls the confluence of the two pumps and controls the main oil circuit pressure;

[0039] 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 the parts in the transmission system; the pump source system 2 provides mutual regulation of pressure and flow for the main oil circuit pressure regulating circuit 5 and the cooling and lubrication circuit 8. It can meet the control requirements under different working conditions, adjust the system pressure and flow supply as needed, and achieve low energy consumption. It has multiple working modes, improves the control characteristics of the hydraulic control system under different working conditions, reduces the energy consumption of the hydraulic control system under different working conditions, and solves the current hydraulic control system design. Either the flow cannot be adjusted as needed, the energy consumption is high, or the adjustment and control are complex, there are problems such as high energy consumption, complex structure, and high cost, and it is difficult to meet the technical problems of commercial vehicles for efficient transmission and economy.

[0040] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: 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 shock absorber 22 and a main oil circuit safety valve 17;

[0041] The main oil circuit pilot valve 16 is a normally closed two-position three-way type with a pressure feedback function, having an inlet, an outlet and an oil 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 oil return port is directly connected to the oil pan;

[0042] The main oil circuit pressure regulating valve 15 is a hydraulically controlled normally closed two-position two-way type, having 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 hydraulic control port of the main oil circuit pressure regulating valve 15 is connected to the outlet of the main oil circuit pilot valve 16;

[0043] The main oil circuit shock absorber 22 is installed in the main oil circuit;

[0044] The main oil circuit safety valve 17 is a hydraulically controlled two-position two-way sliding valve having an inlet and an 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.

[0045] 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, which is used to adjust the valve core opening size of the main oil circuit pressure regulating valve 15; the main oil circuit shock absorber 22 is connected to the main oil circuit, which is used to absorb the pressure oscillation of 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, which is used to limit the maximum value of the main oil circuit pressure;

[0046] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: 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 a plurality of throttle holes; the electromagnetic switch valve 21 mainly controls the cooling of the motor that is 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 plurality of throttle holes perform on-demand lubrication.

[0047] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: 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 shock absorber 22 are directly connected to the main oil circuit of the pump source system 2; the combined inlet 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 value of the main oil circuit pressure.

[0048] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: Figure 2-Figure 4 As shown, the pump source system 2 also includes:

[0049] The first oil pump 10 is connected to the transmission output shaft;

[0050] The second oil pump 11 is an electronic oil pump and 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.

[0051] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: Figure 2-Figure 4 As shown, the first oil pump 10 and the second oil pump 11 are connected to a suction filter 9 in common; the outlet of the first oil pump 10 is connected to a pressure filter 19 and then to the clutch pressure regulating circuit 6 .

[0052] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: Figure 2-Figure 4 As shown, the clutch pressure regulating circuit 6 also includes:

[0053] A first clutch control valve 36 and a second clutch control valve 40, a first clutch oil circuit damper 38 and a second clutch control valve 42, a first clutch pressure sensor 37 and a second clutch pressure sensor 41;

[0054] The inlet of the first clutch control valve 36 and the second clutch control valve 40 are connected to the main oil circuit, and the outlet of the first clutch control valve 36 and the second clutch control valve 40 are connected to the inlet oil circuit of the first clutch oil cylinder 39 and the second clutch oil cylinder 43. The first clutch control valve 36 and the second clutch control valve 40 are both provided with pressure feedback for real-time adjustment of the clutch pressure, and 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 circuit of the first clutch oil cylinder 39 and the second clutch oil cylinder 43 to absorb the pressure fluctuation on the inlet oil circuit of the first clutch oil cylinder 39 and the second clutch oil cylinder 43; the inlet oil circuit of the first clutch oil cylinder 39 and the second clutch oil cylinder 43 is connected to the first clutch pressure sensor 37 and the second clutch pressure sensor 41 to detect the control pressure of the clutch oil cylinder in real time;

[0055] The first clutch oil cylinder 39 and the second clutch oil cylinder 43 are both single-acting piston cylinders, and have only one oil passage. When working, the oil enters the first clutch oil cylinder 39 and the second clutch oil cylinder 43 through the oil passage. When not working, the oil in the first clutch oil cylinder and the second clutch oil cylinder flows out through the oil passage to unload.

[0056] The cooler 20 is a liquid-cooled cooler.

[0057] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: Figure 2-Figure 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 throttle hole 26, a second cooling and lubrication branch 27, a second oil injection pipe 28, a second throttle hole 29, a third cooling and lubrication branch 30, a third oil injection pipe 31, a third throttle hole 32, a fourth cooling and lubrication branch 33, a fourth oil injection pipe 34, and a fourth throttle hole 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 and the first throttle hole 26, the second throttle hole 29, the third throttle hole 32, and the fourth throttle hole 35 are 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 respectively. The first oil spray pipe 25, the second oil spray pipe 28, the third oil spray pipe 31, and the fourth oil spray pipe 34 are used to distribute and guide the oil to the parts that need cooling and lubrication, and then spray the oil evenly to the parts that need cooling and lubrication. The first throttle hole 26, the second throttle hole 29, the third throttle hole 32, and the fourth throttle hole 35 are used to spray the oil evenly to the parts that need cooling and lubrication.

[0058] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: Figure 2-Figure 4 As shown, the cooling lubrication circuit 8 has multiple lubrication branches, and the multiple lubrication branches can be provided with electromagnetic switch valves as required.

[0059] In order to achieve the above technical effects, the two-speed hybrid transmission hydraulic control system in this example is as follows: Figure 2-Figure 4 As shown, the two-speed hybrid transmission hydraulic control system in this embodiment can meet the idle charging and energy recovery mode working requirements of the two-speed hybrid drive system; in the idle charging mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the generator motor; in the energy recovery mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the generator motor.

[0060] The two-speed hybrid transmission hydraulic control system meets the working requirements of the pure electric drive and engine direct drive modes of the two-speed power drive system; in the pure electric drive mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor; in the engine direct drive mode, the two-speed hybrid transmission hydraulic control system needs to provide control pressure for the clutch.

[0061] The two-speed hybrid transmission hydraulic control system can meet the working needs of the series hybrid and parallel hybrid modes of the two-speed hybrid drive system; in the series hybrid mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor, generator motor, and clutch; the two-speed hybrid transmission hydraulic control system needs to provide control oil pressure for the engaged clutch; in the parallel hybrid mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor, generator motor, and clutch; the two-speed hybrid transmission hydraulic control system needs to provide control oil pressure for the engaged clutch.

[0062] Those skilled in the art will appreciate that the above-mentioned embodiments are specific examples for implementing the present invention, and in actual applications, various changes may be made thereto in form and detail without departing from the spirit and scope of the present invention.

Claims

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

2. The two-speed hybrid transmission hydraulic control system according to claim 1, characterized in that: The main oil circuit pressure regulating circuit further comprises: a main oil circuit pilot valve, a main oil circuit pressure regulating valve, a main oil circuit shock absorber and a main oil circuit safety valve; The main oil circuit pilot valve is a normally closed two-position three-way type with a pressure feedback function, having an inlet, an outlet and an oil 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 oil return port is directly connected to the oil pan; The main oil circuit pressure regulating valve is a hydraulically controlled normally closed two-position two-way type, having an inlet and an 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 lubrication circuit; the hydraulic control 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 shock absorber is installed on the main oil circuit; The main oil circuit safety valve is a hydraulically controlled two-position two-way sliding valve having an inlet and an 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 two-speed hybrid transmission hydraulic control system 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 a plurality of throttle holes; 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 perform on-demand lubrication through a plurality of the throttle holes.

4. The two-speed hybrid transmission hydraulic control system according to claim 1, 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 shock absorber 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 two-speed hybrid transmission hydraulic control system according to claim 1, characterized in that: The pump source system further comprises: A first oil pump, wherein the first oil pump is connected to the transmission output shaft; The second oil pump is an electronic oil pump and is not connected to the rotating parts in the transmission.

6. The two-speed hybrid transmission hydraulic control system according to claim 1, characterized in that: The first oil pump and the second oil pump are commonly connected to a suction filter; the outlet of the first oil pump is connected to a pressure filter and then to a clutch pressure regulating circuit.

7. The two-speed hybrid transmission hydraulic control system according to claim 6, characterized in that: The clutch pressure regulating circuit further includes: a first clutch control valve and a second clutch control valve, a first clutch oil circuit damper and a second clutch control valve, a first clutch pressure sensor and a second clutch pressure sensor; The inlet of the first clutch control valve and the second clutch control valve is connected to the main oil circuit, the outlet of the first clutch control valve and the second clutch control valve is connected to the inlet oil circuit of the first clutch oil cylinder and the second clutch oil cylinder, the first clutch control valve and the second clutch control valve are both provided with pressure feedback for real-time adjustment of the clutch pressure, and the pressure relief ports of the first clutch control valve and the second clutch control valve are directly connected to the oil pan; the first clutch oil circuit damper and the second clutch oil circuit damper are installed on the inlet oil circuit of the first clutch oil cylinder and the second clutch oil cylinder for absorbing the pressure fluctuation on the inlet oil circuit of the first clutch oil cylinder and the second clutch oil cylinder; the inlet oil circuit of the first clutch oil cylinder and the second clutch oil cylinder is connected to the first clutch pressure sensor and the second clutch pressure sensor for real-time detection of the control pressure of the clutch oil cylinder; The first clutch oil cylinder and the second clutch oil cylinder are both single-acting piston cylinders, and have only one oil passage. When working, the oil enters the first clutch oil cylinder and the second clutch oil cylinder through the oil passage. When not working, the oil in the first clutch oil cylinder and the second clutch oil cylinder flows out through the oil passage to unload. The cooler is a liquid-cooled cooler.

8. The two-speed hybrid transmission hydraulic control system 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 spray pipe, a first throttle hole, a second cooling and lubrication branch, a second oil spray pipe, a second throttle hole, a third cooling and lubrication branch, a third oil spray pipe, a third throttle hole, a fourth cooling and lubrication branch, a fourth oil spray pipe, and a fourth throttle hole. The electromagnetic switch valve is installed on the lubrication branch that needs to be controlled; the first oil spray pipe, the second oil spray pipe, the third oil spray pipe, the fourth oil spray pipe and the first throttle hole, the second throttle hole, the third throttle hole, and the fourth throttle hole 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, so as to centrally distribute and guide the oil to the parts that need cooling and lubrication, and then evenly spray the oil to the parts that need cooling and lubrication.

9. The two-speed hybrid transmission hydraulic control system according to claim 8, characterized in that: The cooling lubrication circuit has multiple lubrication branches, and the multiple lubrication branches can be provided with electromagnetic switch valves as required.

10. The two-speed hybrid transmission hydraulic control system according to claim 7, characterized in that: The two-speed hybrid transmission hydraulic control system can meet the idle charging and energy recovery mode working requirements of the two-speed hybrid drive system; in the idle charging mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the generator motor; in the energy recovery mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the generator motor. The two-speed hybrid transmission hydraulic control system meets the working requirements of the pure electric drive and engine direct drive modes of the two-speed power drive system; in the pure electric drive mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor; in the engine direct drive mode, the two-speed hybrid transmission hydraulic control system needs to provide control pressure for the clutch. The two-speed hybrid transmission hydraulic control system can meet the working requirements of the series hybrid and parallel hybrid modes of the two-speed hybrid drive system; in the series hybrid mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor, the generator motor, and the clutch; the two-speed hybrid transmission hydraulic control system needs to provide control oil pressure for the engaged clutch; in the parallel hybrid mode, the two-speed hybrid transmission hydraulic control system needs to provide cooling and lubrication for the drive motor, the generator motor, and the clutch; the two-speed hybrid transmission hydraulic control system needs to provide control oil pressure for the engaged clutch.

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