CN113124152A

CN113124152A - Special gearbox hydraulic system for hybrid power

Info

Publication number: CN113124152A
Application number: CN202110425220.9A
Authority: CN
Inventors: 李卫强; 朱顺利; 解建; 于晓春; 韩启锋; 苏鹏
Original assignee: Kuntye Vehicle System Changzhou Co Ltd
Current assignee: Kuntye Vehicle System Changzhou Co Ltd
Priority date: 2021-04-20
Filing date: 2021-04-20
Publication date: 2021-07-16

Abstract

The invention discloses a hydraulic system of a gearbox special for hybrid power, which comprises an oil supply subsystem, a main oil pressure control subsystem, a clutch control subsystem, a gear shifting control subsystem and a lubricating and cooling subsystem, wherein a first electronic pump and a second electronic pump which are connected are arranged in the oil supply subsystem, the main oil pressure control subsystem comprises a switch control valve connected with the second electronic pump, the switch control valve controls the second electronic pump to be switched and communicated with a lubricating oil path or a main oil path, and a first energy accumulator communicated with the main oil path is arranged in the main oil pressure control subsystem. The oil supply subsystem of the invention adopts a duplex electronic pump to supply oil, the switch control valve is arranged to switch high and low pressure oil ways, and the use of the first energy accumulator is matched, so that the electronic pump switches the working mode, can discontinuously work in a high pressure area, reduces the working time of the electronic pump in the high pressure area, prolongs the service life of the electronic pump, improves the efficiency of the whole hydraulic system, and simultaneously can contribute to energy conservation and emission reduction of the whole system.

Description

Special gearbox hydraulic system for hybrid power

Technical Field

The invention relates to the technical field of automobile gearboxes, in particular to a gearbox hydraulic system special for hybrid power.

Background

The hybrid system is a hybrid system. The transmission system which can couple the power of the engine and the driving motor together in a certain mode and can realize speed change and torque change is a hybrid gearbox. Hybrid transmissions can generally be divided into dedicated hybrid transmissions and improved hybrid transmissions based on a conventional transmission integrated hybrid unit (drive motor and corresponding control system).

In the hybrid system, the working mode of the driving motor is very flexible: the vehicle can be driven independently, and pure electric driving is realized; the device can be used as a starting device of the engine to assist the engine to start; the power assisting device can provide power for the engine and improve the acceleration capability of the vehicle; the fuel economy of the engine can be improved by adjusting the torque load of the engine when the vehicle is driven together with the engine; the device can also be used as an energy feedback device to recover braking energy in vehicle deceleration and the like.

However, with the increasing of the oil consumption and emission of automobiles, the national regulations and regulations of the automobile are increased day by day, the hybrid power special gearbox faces higher energy consumption requirements, the oil supply system in the prior art is not reasonable in design, the oil pump of the cooling and lubricating oil way and the oil pump of the main oil way of the gearbox can generate an oil robbing phenomenon during working, and the filtering load of an oil outlet filter screen is increased; the unreasonable arrangement of the structural design of the hydraulic system among the system functions causes the oil pump to work excessively, unnecessary energy consumption is generated, and excessive emission finally influences the use effect of the gearbox, and influences the use performance and service life of each component in the gearbox.

Therefore, a hydraulic system which is reasonable in structural design and suitable for a hybrid power transmission is a problem which needs to be solved urgently at present.

Disclosure of Invention

The invention aims to overcome the defects in the prior art and provides a hydraulic system of a gearbox special for hybrid power.

The purpose of the invention is realized by the following technical scheme:

the hydraulic system of the special gearbox for the hybrid power comprises an oil supply subsystem, a main oil pressure control subsystem, a clutch control subsystem, a gear shifting control subsystem and a lubricating and cooling subsystem, wherein a first electronic pump and a second electronic pump which are connected and controlled by the same motor are arranged in the oil supply subsystem;

the main oil pressure control subsystem comprises a switch control valve connected with the second electronic pump, the switch control valve controls the second electronic pump to be switched and communicated with a lubricating oil path or a main oil path, and a first energy accumulator communicated with the main oil path is arranged in the main oil pressure control subsystem; in a first state, when the main oil pressure in the main oil pressure control subsystem is lower than a set value, the second electronic pump is communicated with a main oil way through the switch control valve and supplies oil to the first energy accumulator; and in a second state, when the main oil pressure in the main oil pressure control subsystem reaches a set value, the second electronic pump is communicated with the lubricating oil way through the switch control valve and supplies oil to the lubricating and cooling subsystem.

Preferably, the lubricating oil path is communicated with the lubricating and cooling subsystem, the main oil path is sequentially communicated with the main oil pressure control subsystem, the gear shifting control subsystem and the clutch control subsystem, and the oil pressure of the main oil path is higher than that of the lubricating oil path.

Preferably, an air bag is arranged in the first energy accumulator, the air bag is internally provided with pre-charging pressure, and the first energy accumulator is filled with oil for energy storage in a first state; and in a second state, the first energy accumulator supplies oil to the clutch control subsystem and the gear shifting control subsystem.

Preferably, a safety valve is arranged in the main oil pressure control subsystem, and the safety valve is positioned on the main oil path and limits the highest oil pressure of the main oil path.

Preferably, a first check valve is arranged in the main oil pressure control subsystem, and the first check valve is close to the switch control valve and controls hydraulic oil to flow in one direction from the oil supply subsystem to the main oil pressure control subsystem.

Preferably, a pressure sensor is arranged in the main oil pressure control subsystem, and the pressure sensor is arranged close to the clutch control subsystem.

Preferably, a high-pressure filter is arranged on a main oil path between the switch control valve and the input end of the first one-way valve, and filters are arranged between the oil tank and the input ends of the first electronic pump and the second electronic pump.

Preferably, the clutch control subsystem includes in proper order with clutch control valve and the clutch of main oil circuit intercommunication, all be equipped with the filter screen before the input of clutch control valve and clutch, the filter screen with the parallel connection has the second energy storage ware between the clutch, the spring end of clutch control valve is provided with a feedback oil circuit, and its with the draining end of oil tank intercommunication is provided with the second check valve.

Preferably, the gear shifting control subsystem comprises two groups of solenoid valve units, each group of solenoid valve units is provided with a solenoid valve and two filter screens, a spring end of the solenoid valve is provided with a feedback oil path, the two filter screens are respectively arranged at the input end and the output end of the solenoid valve, a gear shifting piston is connected between the two solenoid valve units, and the gear shifting fork in the gear shifting piston is subjected to differential control.

Preferably, the lubrication cooling subsystem comprises a temperature sensor, an oil cooler, a bypass valve and a group of throttling holes which are communicated with each other, the temperature sensor is arranged at the input ends of the oil cooler and the bypass valve, the bypass valve is connected with the oil cooler in parallel, and hydraulic oil is output from the output end of the oil cooler or the bypass valve and is output through the throttling holes.

The invention has the following beneficial effects:

1. the oil supply subsystem supplies oil by adopting a duplex electronic pump, the switch control valve is arranged for switching high and low pressure oil paths, the use of the first energy accumulator is matched, when the oil storage of the energy accumulator meets the system requirement, the switch control valve is used for switching to a lubricating oil path, and the electronic pump switches the working mode, so that the electronic pump can discontinuously work in a high pressure area, the working time of the electronic pump in the high pressure area is reduced, the service life of the electronic pump is prolonged, the efficiency of the whole hydraulic system is improved, and meanwhile, the energy conservation and emission reduction of the whole system can be facilitated;

2. the first energy accumulator provides stable flow and pressure for the clutch control subsystem and the gear shifting control subsystem, and continuously provides stable pressure for the whole subsystem before the pressure of the first energy accumulator is reduced to a set lowest value, so that the control accuracy, smoothness and stability are guaranteed, and an air bag is arranged in the first energy accumulator, so that the first energy accumulator has pre-charging pressure capable of meeting the system requirement;

3. the first one-way valve can prevent hydraulic oil in the main oil way from flowing back to the switch control valve, and the first energy accumulator is ensured to supply oil to the clutch control subsystem and the gear shifting control subsystem;

4. the safety valve limits the highest pressure of the whole system and protects the safety of the main oil pressure control subsystem;

5. the pressure sensor is arranged close to the clutch control subsystem, so that the pressure value measured by the pressure sensor is closer to the actual value of the clutch pressure, and more accurate data support is provided for the control of the TCU;

6. the filter, the high-pressure filter and the filter screen are arranged to filter the hydraulic oil layer by layer, so that the cleanness of the oil product of the hydraulic oil is ensured;

7. the spring end of the clutch control valve is provided with a feedback oil path to enable the spring force, the feedback pressure and the electromagnetic force to form dynamic balance, the control on the clutch pressure can realize smooth curve linear control, and the spring end of the electromagnetic valve is provided with a feedback oil path to improve the control accuracy of the electromagnetic valve;

8. the second energy accumulator can absorb oil vibration and hydraulic impact caused by fluctuation of the main oil way, so that the two states of combination and separation of the clutch are more stable;

9. the gear shifting control subsystem consists of two groups of electromagnetic valve units, and the electromagnetic valves and the clutch control valve are of the same type and have good interchangeability;

10. the two groups of electromagnetic valve units are matched for use, differential control can be realized, the impact of the synchronizer and NVH during synchronous gear shifting are reduced, and the gear shifting of the synchronizer is guaranteed;

11. lubricating and cooling oil is subjected to lubrication and cooling for parts of the gearbox after passing through the oil cooler and the oil filter, so that the lubricating and cooling effects are improved;

12. the oil cooler is provided with a bypass valve, and when the oil cooler is blocked, the bypass valve is opened, so that the lubricating subsystem is ensured to have enough lubricating oil to supply parts needing to be lubricated;

13. and the flow of each lubricating point is controlled by using the throttling hole, so that the cost is reduced.

Drawings

The technical scheme of the invention is further explained by combining the accompanying drawings as follows:

FIG. 1: the invention discloses a hydraulic schematic diagram of a gearbox hydraulic control system.

Detailed Description

The present invention will be described in detail below with reference to specific embodiments shown in the drawings. These embodiments are not intended to limit the present invention, and structural, methodical, or functional changes that may be made by one of ordinary skill in the art in light of these embodiments are intended to be within the scope of the present invention.

In the description of the schemes, it should be noted that the terms "center", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In the description of the embodiment, the operator is used as a reference, and the direction close to the operator is a proximal end, and the direction away from the operator is a distal end.

As shown in fig. 1, the present invention discloses a hydraulic system of a hybrid dedicated transmission, which comprises an oil supply subsystem 1, a main oil pressure control subsystem 2, a clutch control subsystem 3, a shift control subsystem 4 and a lubrication cooling subsystem 5, and the structure and the working process of each subsystem are described in detail below with reference to the accompanying drawings.

As shown in fig. 1, there is an oil supply subsystem 1 of the present invention. The oil supply subsystem 1 comprises an oil tank 100 for supplying hydraulic oil, and a first electronic pump 101 and a second electronic pump 102 for outputting the hydraulic oil from the oil tank 100, wherein the first electronic pump 101 and the second electronic pump 102 are connected and controlled by the same motor, so that oil supply of a duplex electronic pump is realized. Specifically, the first electronic pump 101 is communicated with the lubrication cooling subsystem 5 through a lubrication oil path 6, the second electronic pump 102 is communicated with a main oil path 7 through a switch control valve 201, and the main oil pressure control subsystem 2 is communicated with the shift control subsystem 4 and the lubrication cooling subsystem 5 through the main oil path 7. In the present invention, a filter 103 is disposed between the first electronic pump 101 and the second electronic pump 102 and the oil tank 100 to filter the hydraulic oil from the oil tank 100, so as to ensure the cleanness of the oil.

The primary oil pressure control subsystem 2 includes an on-off control valve 201, a first accumulator 202, a relief valve 203, a pressure sensor 204, a first check valve 205, and a high pressure filter 206.

The switch control valve 201 is arranged between the main oil pressure control subsystem 2 and the second electronic pump 102 and is controlled by the TCU, the oil pressure of the main oil path 7 in the invention is higher than that of the lubricating oil path 6, the second electronic pump 102 is controlled to switch and communicate the lubricating oil path 6 or the main oil path 7 by the left and right movement of the switch control valve 201, and the main oil path 7 and the subsystems communicated with the main oil path 7 form a high pressure area. Specifically, in the first state, when the main oil pressure in the main oil pressure control sub-system 2 is lower than a set value, the on-off control valve 201 communicates with the main oil passage 7, and the second electronic pump 102 supplies oil to the main oil pressure control sub-system 2; in the second state, when the oil pressure in the main oil pressure control subsystem 2 reaches a set value, the on-off control valve 201 communicates with the lubrication oil passage 6, and the second electronic pump 102 supplies oil to the lubrication cooling subsystem 5. The second electronic pump 102 realizes intermittent work in the high-pressure area through switching between the first state and the second state, so that the working time of the second electronic pump 102 in the high-pressure area is reduced, the service life of the second electronic pump 102 is prolonged, the efficiency of the whole hydraulic system is improved, and meanwhile, the energy conservation and emission reduction of the whole system can be facilitated.

The first accumulator 202 is provided between the first check valve 204 and the pressure sensor 205 and communicates with the main oil passage 7. In a first state, the first accumulator 202 is filled with oil for energy storage; in the second state, the first accumulator 202 supplies oil to the clutch control subsystem 3 and the shift control subsystem 4. Further, the first accumulator 202 has an air bag therein, and the air bag has a pre-charging pressure therein, so that it can meet the pressure requirement of the system. In a preferred embodiment, the gas filled in the air bag is nitrogen. The arrangement of the first accumulator 202 can provide stable flow and pressure for the clutch control subsystem 3 and the gear shifting control subsystem 4, and before the pressure of the first accumulator 202 is reduced to a set minimum value, the first accumulator 202 continuously provides stable pressure for the whole main oil pressure control subsystem 2, so that the accuracy, smoothness and stability of control are guaranteed. The relief valve 203 communicates with the main oil passage 7, and can limit the maximum pressure of the entire system to protect the safety of the main oil pressure control sub-system 2.

The first check valve 204 is arranged close to the on-off control valve 201 and controls one-way inflow of hydraulic oil from the oil supply subsystem 1 to the main oil pressure control subsystem 2, and the pressure sensor 205 is arranged close to the clutch control subsystem 3. The pressure sensor 205 is in communication with the main oil passage 7 to monitor the pressure of the entire main oil pressure control subsystem 2 in real time, and the on-off control valve 201 is enabled to switch the communication of the lubricating oil passage 6 or the main oil passage 7 according to the measured pressure value. Meanwhile, the pressure sensor 205 is arranged close to the clutch control subsystem 3, so that the pressure value measured by the pressure sensor 205 is closer to the actual value of the clutch pressure, and more accurate data support is provided for the control of the TCU.

The high-pressure filter 206 is disposed between the on-off control valve 201 and the input end of the first check valve 204 to ensure the cleanness of the oil in the main oil path 7.

The clutch control subsystem 3 comprises a clutch control valve 301 and a clutch 302 which are sequentially communicated with the main oil path 7, wherein the clutch control valve 301 is a VFS solenoid valve controlled clutch, so that the clutch control valve 301 can accurately control the pressure and the flow of the passing hydraulic oil. Specifically, the size of the area of the matching opening of the valve core and the valve body of the clutch control valve 301 and the amount of hydraulic oil in the piston cavity of the clutch 302 are controlled by controlling the current of the clutch control valve 301, so that the pressure of the hydraulic oil in the piston cavity of the clutch 302 is adjusted, and the torque transmitted by the clutch 302 is adjusted.

In order to improve the cleanliness of the hydraulic oil entering and exiting the cavity of the clutch 302 and avoid the blockage of the slide valve caused by impurities, filter screens 8 are arranged in front of the input ends of the clutch control valve 301 and the clutch 302. And a second one-way valve 303 is arranged at the oil drainage end of the clutch control valve 301 communicated with the oil tank 100 to avoid the backflow of hydraulic oil.

Further, a spring end of the clutch control valve 301 is provided with a feedback oil path 10. The feedback oil path 10 makes the spring force, the feedback pressure and the electromagnetic force form dynamic balance, and the control of the pressure of the clutch 302 can realize smooth curve linear control, thereby improving the accuracy of controlling the combination and the separation of the clutch 302.

The output end of the clutch control valve 301 is provided with a second energy accumulator 305 connected with the clutch 302 in parallel, and the filter screen 8 is arranged between the second energy accumulator 305 and the clutch control valve 301. The second accumulator 3 can absorb oil vibration and hydraulic impact caused by fluctuation of the main oil passage 7, so that the two states of connection and disconnection of the clutch 302 are more stable.

The gear shift control subsystem 4 comprises two sets of solenoid valve units, each set of solenoid valve units having a solenoid valve 401 and two screens 8, the two solenoid valves 401 being of the same type, and in the preferred embodiment, the solenoid valve 401 and the clutch control valve 301 being of the same type, so that they have good interchangeability. Two filter screen 8 set up respectively in solenoid valve 401's input and output, filter screen 8's setting can further improve the inflow or flow out the oil cleanness of solenoid valve 401's hydraulic oil prevents solenoid valve 401 is by the impurity jamming.

Further, a spring end of the electromagnetic valve 401 is provided with a feedback oil path 10, and the feedback oil path 10 can be arranged to improve the control accuracy of the electromagnetic valve 401 when the electromagnetic valve is controlled.

A shift piston 402 is connected between the two solenoid valve units, and performs differential control on a shift fork 403 in the shift piston 402. The specific gear shifting is as follows: when the gear 1 is shifted, the TCU controls the current of the electromagnetic valve 401 at the right end to act according to the working condition, pressure oil enters the right piston, and the shifting piston 402 and the shifting fork 403 are integrated, so that the shifting fork 403 can smoothly push the synchronizing ring in the synchronizer to shift gears under the action of pressure. When gear shifting is to be finished, in order to avoid gear shifting impact and reduce NVH of gear shifting, the TCU controls the electromagnetic valve 401 at the left end to act, a small pressure is given to the gear shifting piston 402 at the left end to form differential control, so that no impact is generated when gear shifting is finished, and gear shifting is smoothly finished. Meanwhile, a displacement sensor (not shown in the figure) is arranged on the shifting piston 402, and according to a displacement signal, whether the gear is finished and the time for the left electromagnetic valve 401 to enter differential control can be judged. After the displacement sensor judges that gear shifting is completed, the current of the electromagnetic valve 401 at the right end of the TCU is controlled to be zero.

The lubrication cooling subsystem 5 includes temperature sensor 501, oil cooler 502, bypass valve 503 and a set of orifice 504 that are linked together, temperature sensor 501 set up in the input of oil cooler 502 and bypass valve 503, detect promptly and get into the temperature of the hydraulic oil of lubrication cooling subsystem 5, because hydraulic oil lasts the fuel feeding at the gearbox course of operation, set up the oil temperature that can real-time supervision whole gearbox like this, for the solenoid valve 401 in the whole gearbox, the temperature compensation coefficient of clutch control valve 301 provides real-time data, has guaranteed the control of whole gearbox.

The hydraulic oil is output after passing through the oil cooler 502, and is lubricated and cooled for the parts of the gearbox, so that the lubricating and cooling effects are improved, and the parts of the whole gearbox can normally work in a reasonable temperature range.

The bypass valve 503 is connected in parallel with the oil cooler 502, and hydraulic oil is output from the output end of the oil cooler 502 or the bypass valve 503 and is output through the throttle hole 504. The bypass valve 503 is arranged to open the oil body input when the oil cooler 502 is blocked, so as to ensure that the lubrication subsystem has enough lubricating oil to supply to the parts to be lubricated.

In the preferred embodiment, each lubrication point has an orifice 504 to control flow, further reducing cost. Specifically, in the present invention, the first electronic pump 101 and the second electronic pump 102 are flow sources for lubrication and cooling, the rotation speed of the first electronic pump 101 and/or the second electronic pump 102 is adjusted according to the requirement of the lubrication and cooling subsystem 5, the flow is controlled by the throttle 504 of each lubrication point, the size of the pressure of the lubrication and cooling oil path is adjusted, and unnecessary energy consumption is reduced while lubrication and cooling are performed, thereby saving cost.

As shown in fig. 1, the present invention further provides a parking subsystem 9, where the parking subsystem 9 is provided with a control valve 901 and a hydraulic parking mechanism 902, which are communicated with the main oil path 7, and the parking subsystem 9 is also supplied with oil by the first accumulator 202, which is not a key point of the present invention and is not described herein again.

It should be understood that although the present description refers to embodiments, not every embodiment contains only a single technical solution, and such description is for clarity only, and those skilled in the art should make the description as a whole, and the technical solutions in the embodiments can also be combined appropriately to form other embodiments understood by those skilled in the art.

The above-listed detailed description is only a specific description of a possible embodiment of the present invention, and they are not intended to limit the scope of the present invention, and equivalent embodiments or modifications made without departing from the technical spirit of the present invention should be included in the scope of the present invention.

Claims

1. Special gearbox hydraulic system of hybrid, including fuel feeding subsystem (1), main oil pressure control subsystem (2), clutch control subsystem (3), shift control subsystem (4) and lubricated cooling subsystem (5), its characterized in that: a first electronic pump (101) and a second electronic pump (102) which are connected and controlled by the same motor are arranged in the oil supply subsystem (1);

the main oil pressure control subsystem (2) comprises an on-off control valve (201) connected with the second electronic pump (102), the on-off control valve (201) controls the second electronic pump (102) to be switched and communicated with a lubricating oil path (6) or a main oil path (7), and a first accumulator (202) communicated with the main oil path (7) is arranged in the main oil pressure control subsystem (2); in the first state, when the main oil pressure in the main oil pressure control subsystem (2) is lower than a set value, the second electronic pump (102) is communicated with a main oil way (7) through the switch control valve (201) and supplies oil to the first accumulator (202); in the second state, when the main oil pressure in the main oil pressure control subsystem (2) reaches a set value, the second electronic pump (102) is communicated with the lubricating oil path (6) through the switch control valve (201), and the second electronic pump (102) supplies oil to the lubricating and cooling subsystem (5).

2. The hybrid dedicated transmission hydraulic system according to claim 1, characterized in that: the lubricating oil way (6) is communicated with the lubricating and cooling subsystem (5), the main oil way (7) is sequentially communicated with the main oil pressure control subsystem (2), the gear shifting control subsystem (4) and the clutch control subsystem (3), and the oil pressure of the main oil way (7) is higher than that of the lubricating oil way (6).

3. The hybrid dedicated transmission hydraulic system according to claim 2, characterized in that: an air bag is arranged in the first energy accumulator (202), the air bag is internally provided with pre-charging pressure, and the first energy accumulator (202) is charged with oil for energy storage in a first state; in the second state, the first accumulator (202) supplies oil to the clutch control subsystem (3) and the gear shifting control subsystem (4).

4. The hybrid dedicated transmission hydraulic system according to claim 3, characterized in that: and a safety valve (203) is arranged in the main oil pressure control subsystem (2), and the safety valve (203) is positioned on the main oil way (7) and limits the highest oil pressure of the main oil way (7).

5. The hybrid dedicated transmission hydraulic system according to claim 4, characterized in that: be provided with first check valve (204) in main oil pressure control subsystem (2), first check valve (204) are close to on-off control valve (201) set up and control hydraulic oil and follow fuel feeding subsystem (1) is to main oil pressure control subsystem (2) one-way inflow.

6. The hybrid dedicated transmission hydraulic system according to claim 5, characterized in that: a pressure sensor (205) is arranged in the main oil pressure control subsystem (2), and the pressure sensor (205) is close to the clutch control subsystem (3).

7. The hybrid dedicated transmission hydraulic system according to claim 6, characterized in that: and a high-pressure filter (206) is arranged on a main oil path (7) between the switch control valve (201) and the input end of the first check valve (204), and a filter (103) is arranged between the oil tank (100) and the input ends of the first electronic pump (101) and the second electronic pump (102).

8. The hybrid dedicated transmission hydraulic system according to any one of claims 1 to 7, characterized in that: clutch control subsystem (3) including in proper order with clutch control valve (301) and clutch (302) of main oil circuit (7) intercommunication, all be equipped with filter screen (8) before the input of clutch control valve (301) and clutch (302), filter screen (8) with second energy storage ware (305) have parallelly connected between clutch (302), the spring end of clutch control valve (301) is provided with a feedback oil circuit (10), and its with the draining end of oil tank (100) intercommunication is provided with second check valve (303).

9. The hybrid dedicated transmission hydraulic system according to any one of claims 1 to 7, characterized in that: the gear shifting control subsystem (4) comprises two sets of identical solenoid valve units, each solenoid valve unit is provided with a solenoid valve (401) and two filter screens (8), a spring end of the solenoid valve (401) is provided with a feedback oil path (10), the two filter screens (8) are respectively arranged at an input end and an output end of the solenoid valve (401), a gear shifting piston (402) is connected between the two solenoid valve units, and the gear shifting fork (403) in the gear shifting piston (402) is subjected to differential control.

10. The hybrid dedicated transmission hydraulic system according to any one of claims 1 to 7, characterized in that: the lubrication cooling subsystem (5) comprises a temperature sensor (501), an oil cooler (502), a bypass valve (503) and a group of throttling holes (504) which are communicated with each other, the temperature sensor (501) is arranged at the input ends of the oil cooler (502) and the bypass valve (503), the bypass valve (503) is connected with the oil cooler (502) in parallel, and hydraulic oil is output from the output end of the oil cooler (502) or the bypass valve (503) and is output through the throttling holes (504).