CN103498821B

CN103498821B - For the hydraulic control system of the speed changer of parallel planetary gear train

Info

Publication number: CN103498821B
Application number: CN201310483929.XA
Authority: CN
Inventors: 孙保群; 汪韶杰; 李磊; 夏光; 彭建刚; 盛楠; 王阳洋; 吴惠; 张维
Original assignee: Hefei University of Technology
Current assignee: Hefei University of Technology
Priority date: 2013-10-16
Filing date: 2013-10-16
Publication date: 2015-11-11
Anticipated expiration: 2033-10-16
Also published as: CN103498821A

Abstract

The present invention relates to the hydraulic control system of the speed changer for parallel planetary gear train.This system comprises three double-action rams, four single-acting cylinders, shuttle valve, guiding valve that three external control types 23 are logical, parking valve that external control type 25 is logical, two 23 logical interlock valve, nine 23 electric change valves, also comprises main fuel feeding oil pipe, the oil pipe that reverses gear, forward gear oil pipe, manual guiding valve and oil groove.The present invention can make speed changer have parking, reversing, neutral and advance 4 kinds of states by controlling manual guiding valve manually; By the different valve position combination of each valve in hydraulic control system, speed changer can be made to realize 8 forward gears and 2 reverse gear, and can to realize in forward gear shift process changing to the preset of gear; Have when transmission electronic control unit (TCU) total failure with the function of forward gear D1 with " the emergent limping " of R1 traveling of reversing gear.

Description

For the hydraulic control system of the speed changer of parallel planetary gear train

Technical field

The invention belongs to the hydraulic control system for transmission for vehicles, what be specifically related to is a kind of hydraulic control system of the speed changer for vehicle parallel planetary gear train.

Background technique

Transmission for vehicles is divided into manual transmission and automatic transmission.Manual transmission can only be shifted gears by manual hand manipulation, and automatic transmission then can realize self shifter; According to structure, automatic transmission is divided into several patterns such as automatic mechanical transmission (AMT), power gear shifting automatic transmission (AT), stepless speed variator (CVT) and dual-clutch transmission (DSG).At present, the automatic gear change function of automatic transmission generally controls indexing servo by transmission electronic control unit (TCU) and executive system realizes; Indexing servo and executive system can be divided into again electronic, pneumatic and hydraulic pressure three types, and the mainly hydraulic control system usually adopted at most.In hydraulic gear-shifting servo and executive control system, according to control signal, servoelement and actuator's type, all-hydraulic control and the large class of electrichydraulic control two can be divided into again.All-hydraulic control refers to that control signal and servo implementation are all hydraulic way, owing to driver's operation must be intended to, motor and vehicle operating status etc. be all converted to hydraulic pressure signal in order to control automatic speed changing, cause that system complex, control accuracy are low, low-response, rate of fault are high, no longer adopt in modern vehicle automatic shift control; Electrichydraulic control uses solenoid valve to control the actuator of gearshift executive system to realize automatic speed changing as servo control element, and what current most of vehicle automatic transmission adopted is all this pattern.In automatic speed changing electrohydraulic control system, according to the control mode of solenoid valve to gear shifting actuating mechanism actuator oil circuit, direct control type and indirect control formula two kinds of fundamental types can be divided into; Direct control type has controlled gear shift with proportional electromagnetic valve and Multi-position electromagnetic valve to actuator oil circuit, its advantage is that system architecture is relatively simple, gearshift precision is high, response is fast, shortcoming is that used electromagnetic valve structure is complicated, manufacture cost is high, it is high, responsive to hydraulic oil pollution to require magnetic valve performance and control accuracy, and system failure rate is relatively high; Indirect control formula is by utilizing the simple electromagnetic switch valve of structure, solenoid directional control valve or PWM-type electromagnetic switch valve (PWM control) control to servo guiding valve, indirect control actuator oil circuit completes gear shift, although its system parts is more, structure relative complex, control response are relatively slow, but electromagnetic valve structure used is simple, control is easy, require low to magnetic valve performance and control accuracy, system is insensitive to hydraulic oil pollution, and system failure rate, difficulty of processing and manufacture cost are also relatively low; In conjunction with directly controlling and indirectly controlling two profiles formula, also can form Hybrid mode formula hydraulic control system, be characterized in the simple solenoid directional control valve of structure direct control section actuator oil circuit, simultaneously by utilizing simple electromagnetic switch valve, solenoid directional control valve or PWM-type electromagnetic switch valve (PWM control) control to servo guiding valve, the other a part of actuator oil circuit of indirect control, thus mixing type hydraulic control system has the feature directly controlling and indirectly control two profiles formula concurrently.

Summary of the invention

In order to reduce gearshift of vehicle transmission hydraulic control system parts machining difficulty and manufacture cost, improve system reliability, the present invention proposes a kind ofly to reverse gear and the hydraulic control system of parallel planetary gear train transmission of 8 forward gears for having 2.

Hydraulic control system for parallel planetary gear train transmission comprises three double-action rams, is respectively the first two-way cylinder 13, second two-way cylinder 14 and the 3rd two-way cylinder 15; Four single-acting cylinders, are respectively the unidirectional oil cylinder 25 of the first unidirectional oil cylinder 24, second, the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27; Shuttle valve 16; Three external control types, 23 guiding valves led to, are respectively the first guiding valve 17, second guiding valve 18 and the 3rd guiding valve 19; External control type 25 parking valves 28 led to; Two 23 interlock valve of leading to, are respectively the first interlock valve 29 and the second interlock valve 30; Nine 23 electric change valves, are respectively the first solenoid directional control valve 20, second solenoid directional control valve 21, the 3rd solenoid directional control valve 22, the 4th solenoid directional control valve 23, the 5th solenoid directional control valve 31, the 6th solenoid directional control valve 32, the 7th solenoid directional control valve 33, the 8th solenoid directional control valve 34, the 9th solenoid directional control valve 35; Also comprise main fuel feeding oil pipe 201, the oil pipe 202 that reverses gear, forward gear oil pipe 203, manual guiding valve 12 and oil groove 11;

The hydraulic fluid port A of described first two-way cylinder 13 rodless cavity is communicated with the hydraulic fluid port B of the first guiding valve 17, the hydraulic fluid port B of rod chamber and is communicated with the first hydraulic fluid port A of the first guiding valve 17 and hydraulic fluid port A of the first solenoid directional control valve 20 simultaneously; The drain tap T of described first guiding valve 17 is communicated with the 3rd hydraulic fluid port B that oil groove 11, control port X are communicated with shuttle valve 16; The hydraulic fluid port A that first hydraulic fluid port A1 of described shuttle valve 16 is communicated with one end of the oil pipe 202 that reverses gear, the second hydraulic fluid port A2 is communicated with the control port X of the second guiding valve 18, the control port X of the 3rd guiding valve 19 and the 4th solenoid directional control valve 23 simultaneously; The oil inlet P of described first solenoid directional control valve 20 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; The oil inlet P of described 4th solenoid directional control valve 23 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; When simultaneously to can make when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B fuel feeding its piston move to right position realize reverse gear R commutation put into gear, when to its rodless cavity hydraulic fluid port A draining, simultaneously to can make during its rod chamber hydraulic fluid port B fuel feeding its piston move to left position realize forward gear D commutation put into gear, when its piston rest can be made in present position to when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B draining simultaneously;

The hydraulic fluid port A of described second two-way cylinder 14 rodless cavity is communicated with the hydraulic fluid port B of the second guiding valve 18, the hydraulic fluid port B of rod chamber and is communicated with the hydraulic fluid port A of the second guiding valve 18 and hydraulic fluid port A of the second solenoid directional control valve 21 simultaneously; The drain tap T of described second guiding valve 18 is communicated with oil groove 11; The oil inlet P of described second solenoid directional control valve 21 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; When to its piston can be made when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B fuel feeding to move to right position, to realize the gear of forward gear D1 or forward gear D5 or reverse gear R1 or the R2 that reverses gear preset simultaneously, when to its rodless cavity hydraulic fluid port A draining, to its piston can be made during its rod chamber hydraulic fluid port B fuel feeding to move to left position, to realize the gear of forward gear D3 or forward gear D7 preset simultaneously, when its piston rest can be made in present position to when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B draining simultaneously;

The hydraulic fluid port A of described 3rd two-way cylinder 15 rodless cavity is communicated with the hydraulic fluid port B of the 3rd guiding valve 19, the hydraulic fluid port B of rod chamber and is communicated with the hydraulic fluid port A of the 3rd the guiding valve 19 and hydraulic fluid port A of the 3rd solenoid directional control valve 22 simultaneously; The drain tap T of described 3rd guiding valve 19 is communicated with oil groove 11; The oil inlet P of described 3rd solenoid directional control valve 22 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; When to its piston can be made when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B fuel feeding to move to right position, to realize the gear of forward gear D2 or forward gear D6 preset simultaneously, when to its rodless cavity hydraulic fluid port A draining, to its piston can be made during its rod chamber hydraulic fluid port B fuel feeding to move to left position, to realize the gear of forward gear D4 or forward gear D8 preset simultaneously, when its piston rest can be made in present position to when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B draining simultaneously;

The hydraulic fluid port A of described first unidirectional oil cylinder 24 is communicated with the first hydraulic fluid port A, the first control port X of the first interlock valve 29 and hydraulic fluid port A of the 5th solenoid directional control valve 31 simultaneously; The oil inlet P of described 5th solenoid directional control valve 31 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; Its piston can be made to move to during hydraulic fluid port A fuel feeding to the first unidirectional oil cylinder 24 transmission that right position realizes reverse gear shift R1 or forward gear D1 or forward gear D3, can make its piston be displaced downwardly in action of reset spring the transmission that reverse gear shift R1 or forward gear D1 or forward gear D3 are interrupted in left position during hydraulic fluid port A draining to the first unidirectional oil cylinder 24;

The hydraulic fluid port A of described second unidirectional oil cylinder 25 is communicated with the second hydraulic fluid port B, the second control port Y of the first interlock valve 29 and hydraulic fluid port A of the 6th solenoid directional control valve 32 simultaneously; The oil inlet P of described 6th solenoid directional control valve 32 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; The drain tap T of described first interlock valve 29 is communicated with oil groove 11; Its piston can be made during hydraulic fluid port A fuel feeding to the second unidirectional oil cylinder 25 to move to right position to realize reversing gear the transmission of R2 or forward gear D5 or forward gear D7, its piston can be made during hydraulic fluid port A draining to the second unidirectional oil cylinder 25 to be displaced downwardly to left position in action of reset spring and to interrupt reversing gear the transmission of R2 or forward gear D5 or forward gear D7;

The hydraulic fluid port A of described 3rd unidirectional oil cylinder 26 is communicated with the 3rd hydraulic fluid port A1 of parking valve 28, to its piston can be made to move to during its hydraulic fluid port A fuel feeding transmission that right position realizes forward gear D2 or forward gear D4, be displaced downwardly in action of reset spring the transmission that forward gear D2 or forward gear D4 is interrupted in left position to its piston can be made during its hydraulic fluid port A draining;

The hydraulic fluid port A of described 4th unidirectional oil cylinder 27 is communicated with the 4th hydraulic fluid port B1 of parking valve 28; First hydraulic fluid port A of described parking valve 28 is communicated with the first hydraulic fluid port A, the first control port X of the second interlock valve 30 and hydraulic fluid port A of the 7th solenoid directional control valve 33 simultaneously, second hydraulic fluid port B of parking valve 28 is communicated with the second hydraulic fluid port B, the second control port Y of the second interlock valve 30 and hydraulic fluid port A of the 8th solenoid directional control valve 34 simultaneously, and oil inlet P and the control port X of parking valve 28 are communicated with the hydraulic fluid port A of the 9th solenoid directional control valve 35 simultaneously; The drain tap T of described second interlock valve 30 is communicated with oil groove 11; The oil inlet P of described 7th solenoid directional control valve 33 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; The oil inlet P of described 8th solenoid directional control valve 34 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; The oil inlet P of described 9th solenoid directional control valve 35 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; Its piston can be made to move to during hydraulic fluid port A fuel feeding to the 4th unidirectional oil cylinder 27 transmission that right position realizes forward gear D6 or forward gear D8, can make its piston be displaced downwardly in action of reset spring the transmission that forward gear D6 or forward gear D8 is interrupted in left position during hydraulic fluid port A draining to the 4th unidirectional oil cylinder 27.

Described three double-action rams are single-piston rod double-action ram, and described four single-acting cylinders are the single-piston rod one-way cylinder of band spring reset.

Advantageous Effects of the present invention embodies in the following areas:

1. hydraulic control system involved in the present invention, can reverse gear supporting with the parallel planetary gear train transmission of 8 forward gears with having 2;

2. hydraulic control system involved in the present invention, can make speed changer have parking (P), reversing (R), neutral (N) and (D) 4 kinds of states of advancing by controlling manual guiding valve 12 manually; By the different valve position combination of each valve in hydraulic control system, speed changer can be made to realize 8 forward gears and 2 reverse gear, and can to realize in forward gear shift process preset (the changing to putting into gear in advance of gear) that change to gear;

3. the first interlock valve 29 arranged in the present invention can realize the action interlocking between the first unidirectional oil cylinder 24 and the second unidirectional oil cylinder 25, and the transmission can effectively avoiding reversing gear between R1 and R2, between forward gear D1 and D5, between forward gear D3 and D7 is interfered; The second interlock valve 30 arranged in the present invention can realize the action interlocking between the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27, can effectively avoid the transmission between forward gear D2 and D6, between forward gear D4 and D8 to interfere;

4. hydraulic control system involved in the present invention, when transmission electronic control unit (TCU) total failure, operation by means of only opponent's control slide valve 12 just can make speed changer realize forward gear D and the commutation of the R that reverses gear is put into gear, put into gear and transmission, thus makes vehicle have with the function of forward gear D1 with " the emergent limping " of R1 traveling of reversing gear when transmission electronic control unit (TCU) total failure;

5. hydraulic control system involved in the present invention, by controlling the valve position of external control type 25 logical parking valves 28, can make speed changer have hydraulic parking braking function when P keeps off;

6. hydraulic control system involved in the present invention, can, when vehicle is started to walk with forward gear D1 or the R1 that reverses gear, make speed changer have ramp start assisting function (ramp anti-slip hill start step function);

7. hydraulic control system involved in the present invention, add automatic shift control software in the transmission electronic control unit (TCU) for controlling nine solenoid directional control valves (20,21,22,23,31,32,33,34,35) after, can realize speed changer 2 reverse gear between or automatic speed changing between 8 forward gears.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Sequence number in Fig. 1: oil groove 11, manual guiding valve 12, first two-way cylinder 13, second two-way cylinder 14, 3rd two-way cylinder 15, shuttle valve 16, first guiding valve 17, second guiding valve 18, 3rd guiding valve 19, first solenoid directional control valve 20, second solenoid directional control valve 21, 3rd solenoid directional control valve 22, 4th solenoid directional control valve 23, first unidirectional oil cylinder 24, second unidirectional oil cylinder 25, 3rd unidirectional oil cylinder 26, 4th unidirectional oil cylinder 27, parking valve 28, first interlock valve 29, second interlock valve 30, 5th solenoid directional control valve 31, 6th solenoid directional control valve 32, 7th solenoid directional control valve 33, 8th solenoid directional control valve 34, 9th solenoid directional control valve 35, main fuel feeding oil pipe 201, reverse gear oil pipe 202, forward gear oil pipe 203.

Embodiment

Below in conjunction with accompanying drawing, by embodiment, the present invention is further described.

Embodiment

See Fig. 1, the hydraulic control system for the speed changer of parallel planetary gear train comprises three double-action rams, is respectively the first two-way cylinder 13, second two-way cylinder 14 and the 3rd two-way cylinder 15; Four single-acting cylinders, are respectively the unidirectional oil cylinder 25 of the first unidirectional oil cylinder 24, second, the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27; Shuttle valve 16; Three external control types, 23 guiding valves led to, are respectively the first guiding valve 17, second guiding valve 18 and the 3rd guiding valve 19; External control type 25 parking valves 28 led to; Two 23 interlock valve of leading to, are respectively the first interlock valve 29 and the second interlock valve 30; Nine 23 electric change valves, are respectively the first solenoid directional control valve 20, second solenoid directional control valve 21, the 3rd solenoid directional control valve 22, the 4th solenoid directional control valve 23, the 5th solenoid directional control valve 31, the 6th solenoid directional control valve 32, the 7th solenoid directional control valve 33, the 8th solenoid directional control valve 34, the 9th solenoid directional control valve 35; Also comprise main fuel feeding oil pipe 201, the oil pipe 202 that reverses gear, forward gear oil pipe 203, manual guiding valve 12 and oil groove 11;

The hydraulic fluid port A of described first unidirectional oil cylinder 24 is communicated with hydraulic fluid port A, the first control port X of the first interlock valve 29 and hydraulic fluid port A of the 5th solenoid directional control valve 31 simultaneously; The oil inlet P of described 5th solenoid directional control valve 31 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; Its piston can be made to move to during hydraulic fluid port A fuel feeding to the first unidirectional oil cylinder 24 transmission that right position realizes reverse gear shift R1 or forward gear D1 or forward gear D3, can make its piston be displaced downwardly in action of reset spring the transmission that reverse gear shift R1 or forward gear D1 or forward gear D3 are interrupted in left position during hydraulic fluid port A draining to the first unidirectional oil cylinder 24;

The hydraulic fluid port A of described second unidirectional oil cylinder 25 is communicated with hydraulic fluid port B, the second control port Y of the first interlock valve 29 and hydraulic fluid port A of the 6th solenoid directional control valve 32 simultaneously; The oil inlet P of described 6th solenoid directional control valve 32 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; The drain tap T of described first interlock valve 29 is communicated with oil groove 11; Its piston can be made during hydraulic fluid port A fuel feeding to the second unidirectional oil cylinder 25 to move to right position to realize reversing gear the transmission of R2 or forward gear D5 or forward gear D7, its piston can be made during hydraulic fluid port A draining to the second unidirectional oil cylinder 25 to be displaced downwardly to left position in action of reset spring and to interrupt reversing gear the transmission of R2 or forward gear D5 or forward gear D7;

The hydraulic fluid port A of described 4th unidirectional oil cylinder 27 is communicated with the 4th hydraulic fluid port B1 of parking valve 28; First hydraulic fluid port A of described parking valve 28 is communicated with hydraulic fluid port A, the first control port X of the second interlock valve 30 and hydraulic fluid port A of the 7th solenoid directional control valve 33 simultaneously, second hydraulic fluid port B of parking valve 28 is communicated with hydraulic fluid port B, the second control port Y of the second interlock valve 30 and hydraulic fluid port A of the 8th solenoid directional control valve 34 simultaneously, and oil inlet P and the control port X of parking valve 28 are communicated with the hydraulic fluid port A of the 9th solenoid directional control valve 35 simultaneously; The drain tap T of described second interlock valve 30 is communicated with oil groove 11; The oil inlet P of described 7th solenoid directional control valve 33 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; The oil inlet P of described 8th solenoid directional control valve 34 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; The oil inlet P of described 9th solenoid directional control valve 35 is communicated with forward gear oil pipe 203, drain tap T and is communicated with oil groove 11; Its piston can be made to move to during hydraulic fluid port A fuel feeding to the 4th unidirectional oil cylinder 27 transmission that right position realizes forward gear D6 or forward gear D8, can make its piston be displaced downwardly in action of reset spring the transmission that forward gear D6 or forward gear D8 is interrupted in left position during hydraulic fluid port A draining to the 4th unidirectional oil cylinder 27.

Working principle of the present invention is as follows:

See Fig. 1, during engine start, manual guiding valve 12 must be placed in P position; After engine start enters normal idle running, control each solenoid valve, guiding valve and oil cylinder are in the normal state by transmission electronic control unit (TCU).The normality of the first solenoid directional control valve 20 is that energising is in position, left and right, oil inlet P cut-off, hydraulic fluid port A are communicated with drain tap T, makes the rod chamber hydraulic fluid port B of the first two-way cylinder 13 be communicated with the hydraulic fluid port A of the first solenoid directional control valve 20 can by the drain tap T draining of the hydraulic fluid port A of the first solenoid directional control valve 20 and the first solenoid directional control valve 20.The control port X of the first guiding valve 17 is by the hydraulic fluid port B of shuttle valve 16 and the first hydraulic fluid port A1, the oil pipe 202 that reverses gear, the first hydraulic fluid port A of manual guiding valve 12 and the drain tap T draining of manual guiding valve 12, therefore the normality of the first guiding valve 17 is left position, hydraulic fluid port A ends simultaneously hydraulic fluid port B and be communicated with its drain tap T, makes the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 be communicated with the hydraulic fluid port B of the first guiding valve 17 can by the hydraulic fluid port B of the first guiding valve 17 and drain tap T draining.The normality of the second solenoid directional control valve 21 is that energising is in position, left and right, oil inlet P cut-off, and hydraulic fluid port A is communicated with its drain tap T, make the rod chamber hydraulic fluid port B of the second two-way cylinder 14 be communicated with the hydraulic fluid port A of the second solenoid directional control valve 21 can by the hydraulic fluid port A of the second solenoid directional control valve 21 and drain tap T draining.The normality of the second guiding valve 18 is left position, drain tap T ends simultaneously hydraulic fluid port B and is communicated with its hydraulic fluid port A, makes the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 be communicated with the hydraulic fluid port B of the second guiding valve 18 can by the hydraulic fluid port A of the hydraulic fluid port B of the second guiding valve 18 and hydraulic fluid port A, the second solenoid directional control valve 21 and drain tap T draining.The normality of the 3rd solenoid directional control valve 22 is that energising is in position, left and right, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the rod chamber hydraulic fluid port B of the 3rd two-way cylinder 15 be communicated with the hydraulic fluid port A of the 3rd solenoid directional control valve 22 can by the hydraulic fluid port A of the 3rd solenoid directional control valve 22 and hydraulic fluid port T draining.The normality of the 3rd guiding valve 19 is left position, its hydraulic fluid port T ends hydraulic fluid port B simultaneously and is communicated with hydraulic fluid port A, makes the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 be communicated with the hydraulic fluid port B of the 3rd guiding valve 19 can by the hydraulic fluid port A of the hydraulic fluid port B of the 3rd guiding valve 19 and hydraulic fluid port A, the 3rd solenoid directional control valve 22 and drain tap T draining.The normality of the 4th solenoid directional control valve 23 is that power-off is in left position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, the control port X of the second guiding valve 18 be communicated with the hydraulic fluid port A of the 4th solenoid directional control valve 23 while of making and the control port X of the 3rd guiding valve 19 can by the hydraulic fluid port A of the 4th solenoid directional control valve 23 and drain tap T draining, thus make the second guiding valve 18 and the 3rd guiding valve 19 remain on left position its normal orientation.The normality of the 5th solenoid directional control valve 31 is that energising is in right position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the first control port X of the hydraulic fluid port A of the first unidirectional oil cylinder 24 be communicated with the hydraulic fluid port A of the 5th solenoid directional control valve 31 and the first interlock valve 29 can by the hydraulic fluid port A of the 5th solenoid directional control valve 31 and drain tap T draining.The normality of the 6th solenoid directional control valve 32 is that energising is in right position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the second control port Y of the hydraulic fluid port A of the second unidirectional oil cylinder 25 be communicated with the hydraulic fluid port A of the 6th solenoid directional control valve 32 and the first interlock valve 29 can by the hydraulic fluid port A of the 6th solenoid directional control valve 32 and drain tap T draining.The normality of the first interlock valve 29 is left position, the first hydraulic fluid port A ends, and the second hydraulic fluid port B connection drain tap T, the first control port X and the second control port Y are all in pressure release state simultaneously.The normality of the 7th solenoid directional control valve 33 is that power-off is in left position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 be communicated with the 3rd hydraulic fluid port A1 of parking valve 28 can by the hydraulic fluid port A of the 3rd hydraulic fluid port A1 of parking valve 28 and the first filler opening A, the 7th solenoid directional control valve 33 and drain tap T draining, also make the first control port X of the second interlock valve 30 be communicated with the hydraulic fluid port A of the 7th solenoid directional control valve 33 can by the hydraulic fluid port A of the 7th solenoid directional control valve 33 and drain tap T draining simultaneously.The normality of the 8th solenoid directional control valve 34 is that power-off is in left position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the 4th unidirectional oil cylinder 27 be communicated with the 4th hydraulic fluid port B1 of parking valve 28 can by the hydraulic fluid port A of the 4th hydraulic fluid port B1 of parking valve 28 and the second hydraulic fluid port B, the 8th solenoid directional control valve 34 and drain tap T draining, also make the second control port Y of the second interlock valve 30 be communicated with the hydraulic fluid port A of the 8th solenoid directional control valve 34 can by the hydraulic fluid port A of the 8th solenoid directional control valve 34 and drain tap T draining simultaneously.The normality of the second interlock valve 30 is left position, the first hydraulic fluid port A ends, and the second hydraulic fluid port B connection drain tap T, the first control port X and the second control port Y are all in pressure release state simultaneously.The normality of the 9th solenoid directional control valve 35 is that power-off is in left position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the control port X of the parking valve 28 be communicated with the hydraulic fluid port A of the 9th solenoid directional control valve 35 can by the hydraulic fluid port A of the 9th solenoid directional control valve 35 and drain tap T draining.The normality of parking valve 28 is left position, the first hydraulic fluid port A is communicated with the 3rd hydraulic fluid port A1, and the second hydraulic fluid port B is communicated with the 4th hydraulic fluid port B1, oil inlet P cut-off simultaneously; But when to control port X fuel feeding, parking valve 28 is right position, the first hydraulic fluid port A and the second hydraulic fluid port B ends, and makes the second interlock valve 30 lose interlocked and uses and make the oil inlet P of parking valve 28 be communicated with the 3rd hydraulic fluid port A1 and the 4th hydraulic fluid port B1 simultaneously simultaneously; The normality of the first two-way cylinder 13, second two-way cylinder 14 and the 3rd two-way cylinder 15 is for being still in meta N position; The normality of the unidirectional oil cylinder 25 of the first unidirectional oil cylinder 24, second, the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 is N position, left position.

During parking, manual guiding valve 12 is placed in parking gear P position, oil inlet P is communicated with the second hydraulic fluid port B, drain tap T is communicated with the first hydraulic fluid port A, make the hydraulic fluid port B of control port X by shuttle valve 16 of the first guiding valve 17, first hydraulic fluid port A1, reverse gear oil pipe 202, first hydraulic fluid port A of manual guiding valve 12 and drain tap T draining thus make the first guiding valve 17 be in left position, hydraulic fluid port B is communicated with drain tap T, the oil inlet P of control slide valve 12 handled by main fuel feeding oil pipe 201, second hydraulic fluid port B is to forward gear oil pipe 203 fuel feeding, by the regulation and control of transmission electronic control unit (TCU), make each solenoid valve, guiding valve and oil cylinder are all in respective normality.

During reversing, manual guiding valve 12 is allocated to R position by P position, drain tap T ends, oil inlet P is communicated with the first hydraulic fluid port A and its second hydraulic fluid port B simultaneously, enters and reverses gear oil pipe 202 and enter forward gear oil pipe 203 through the second hydraulic fluid port B after the fluid in main fuel feeding oil pipe 201 handles the drain tap P of control slide valve 12, respectively through the first hydraulic fluid port A, enter the fluid that reverses gear in oil pipe 202 the first hydraulic fluid port A1 through shuttle valve 16 and make with the control port X fuel feeding of hydraulic fluid port B to the first guiding valve 17 that it is in right position, drain tap T ends and hydraulic fluid port A is communicated with hydraulic fluid port B, first solenoid directional control valve 20 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the first solenoid directional control valve 20 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the first two-way cylinder 13, and simultaneously through oil inlet P and the hydraulic fluid port A of the first solenoid directional control valve 20, the hydraulic fluid port A of the first guiding valve 17 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the first two-way cylinder 13, make the piston of the first two-way cylinder 13 move to realize the reversing gear commutation of R of right position to put into gear, then, first solenoid directional control valve 20 energising is in right position, make the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 and rod chamber hydraulic fluid port B be in draining state simultaneously, thus make the piston rest of the first two-way cylinder 13 in right position, after this, second solenoid directional control valve 21 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the second two-way cylinder 14, meanwhile through oil inlet P and the hydraulic fluid port A of the second solenoid directional control valve 21, the rodless cavity hydraulic fluid port A fuel feeding of the hydraulic fluid port P of the second guiding valve 18 and hydraulic fluid port A to the second two-way cylinder 14 its piston is moved to right realize the to reverse gear gear of R1 and R2 is preset, then, second solenoid directional control valve 21 energising is in right position, make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B be in draining state simultaneously, thus make the piston rest of the second two-way cylinder 14 in right position, subsequently, 5th solenoid directional control valve 31 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to right position through the oil inlet P of the 5th solenoid directional control valve 31 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the first unidirectional oil cylinder 24 to realize R1 and keep off transmission, meanwhile it is made to be in left position to the first control port X fuel feeding of the first interlock valve 29, first hydraulic fluid port A ends, and the second hydraulic fluid port B is communicated with its drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 can not form the transmission of the R2 that reverses gear all the time through the second hydraulic fluid port B of the first interlock valve 29 and drain tap T draining, thus avoid the transmission interference of reversing gear between R1 and R2.

When changing to R2 gear by R1 gear, 5th solenoid directional control valve 31 energising is in right position, oil inlet P cut-off, and hydraulic fluid port A is communicated with the first control port X of drain tap T, the hydraulic fluid port A making the first unidirectional oil cylinder 24 and the first interlock valve 29 simultaneously through hydraulic fluid port A and the drain tap T draining of the 5th solenoid directional control valve 31, makes the piston of the first unidirectional oil cylinder 24 move to left position and interrupt the transmission of R1 gear, subsequently, 6th solenoid directional control valve 32 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to right position through the oil inlet P of the 6th solenoid directional control valve 32 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the second unidirectional oil cylinder 25 to realize R2 and keep off transmission, meanwhile it is made to be in right position to the second control port Y fuel feeding of the first interlock valve 29, second hydraulic fluid port B ends, and the first hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the first unidirectional oil cylinder 24 can not form the transmission of the R1 that reverses gear all the time through the first hydraulic fluid port A of the first interlock valve 29 and drain tap T draining, thus avoid the transmission interference of reversing gear between R2 and R1.

When changing to R1 gear by R2 gear, the 6th solenoid directional control valve 32 energising is in right position, subsequently the 5th solenoid directional control valve 31 power-off and is in left position, and namely interruptible price R2 keeps off power, realizes the transmission of R1 gear.

When changing to parking gear by the R1 that reverses gear, manual guiding valve 12 is allocated to P position by R position, oil inlet P is communicated with the second hydraulic fluid port B, and the first hydraulic fluid port A be communicated with drain tap T, the first guiding valve 17 control port X by the first hydraulic fluid port A of the hydraulic fluid port B of shuttle valve 16 and hydraulic fluid port A1, the oil pipe 202 that reverses gear, manual guiding valve 12 and drain tap T draining thus be in left position, hydraulic fluid port A end, and hydraulic fluid port B connection drain tap T, makes the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 by the hydraulic fluid port A of the first guiding valve 17 and drain tap T draining, after this, first solenoid directional control valve 20 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to left through the oil inlet P of the first solenoid directional control valve 20 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the first two-way cylinder 13, when its piston moves to middle N position, first solenoid directional control valve 20 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with its drain tap T, the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in meta N, meanwhile, 5th solenoid directional control valve 31 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the first unidirectional oil cylinder 24 by the hydraulic fluid port A of the 5th solenoid directional control valve 31 and drain tap T draining thus make its piston move to left position to interrupt R1 and keep off transmission, subsequently, 4th solenoid directional control valve 23 energising is in right position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the 4th solenoid directional control valve 23 oil inlet P and the control port X fuel feeding of hydraulic fluid port A to the second guiding valve 18 makes it be in right position, hydraulic fluid port A ends, and hydraulic fluid port B is communicated with drain tap T, make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 by the hydraulic fluid port A of the second guiding valve 18 and drain tap T draining, afterwards, second solenoid directional control valve 21 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to left through the oil inlet P of the second solenoid directional control valve 21 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the second two-way cylinder 14, when the piston of the second two-way cylinder 14 moves to left to middle N position, second solenoid directional control valve 21 energising is in right position, its oil inlet P is ended, and hydraulic fluid port A is communicated with its drain tap T, make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B be in draining state simultaneously thus make the piston rest of the second two-way cylinder 14 in meta N, so far, all solenoid directional control valves, guiding valve and oil cylinder full recovery are to normality during each comfortable P gear.

When changing to neutral by reversing gear, manual guiding valve 12 is allocated to N position by R position, oil inlet P is ended, and the first hydraulic fluid port A is communicated with drain tap T with the second hydraulic fluid port B simultaneously, reverse gear oil pipe 202 and the forward gear oil pipe 203 that is communicated with the second hydraulic fluid port B that make to be communicated with the first hydraulic fluid port A are simultaneously through drain tap T draining, now no matter the 5th solenoid directional control valve 31, 6th solenoid directional control valve 32, 7th solenoid directional control valve 33 and the 8th solenoid directional control valve 34 are in energising or off-position, the hydraulic fluid port A of the first unidirectional oil cylinder 24, the hydraulic fluid port A of the second unidirectional oil cylinder 25, the hydraulic fluid port A of the 3rd unidirectional the oil cylinder 26 and hydraulic fluid port A of the 4th unidirectional oil cylinder 27 is all in draining state, the transmission of any gear can not be formed thus achieve neutral.

By neutral change to reverse gear time, it is manual that guiding valve 12 is allocated to R position by N position, drain tap T ends, and oil inlet P is communicated with the first hydraulic fluid port A and the second hydraulic fluid port B simultaneously, after fluid in main fuel feeding oil pipe 201 handles the oil inlet P of control slide valve 12, the the first hydraulic fluid port A handling control slide valve 12 respectively enters the oil pipe 202 that reverses gear, enters forward gear oil pipe 203 through the second hydraulic fluid port B, the fluid reversed gear in oil pipe 202 through the first hydraulic fluid port A1 of shuttle valve 16 and hydraulic fluid port B to the control port X fuel feeding of the first guiding valve 17, make the first guiding valve 17 be in right position, drain tap T ends, and hydraulic fluid port A is communicated with its hydraulic fluid port B, first solenoid directional control valve 20 power-off is in left position, drain tap T ends and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the first solenoid directional control valve 20 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the first two-way cylinder 13, simultaneously through oil inlet P and the hydraulic fluid port A of the first solenoid directional control valve 20, the rodless cavity hydraulic fluid port A fuel feeding of the hydraulic fluid port A of the first guiding valve 17 and hydraulic fluid port B to the first two-way cylinder 13 makes its piston move to realize the reversing gear commutation of R of right position to put into gear, then, first solenoid directional control valve 20 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in right position, after this, second solenoid directional control valve 21 power-off is in left position, its drain tap T is ended, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the second two-way cylinder 14, simultaneously through oil inlet P and the hydraulic fluid port A of the second solenoid directional control valve 21, the rodless cavity hydraulic fluid port A fuel feeding of the hydraulic fluid port A of the second guiding valve 18 and hydraulic fluid port B to the second two-way cylinder 14 its piston is moved to right realize the to reverse gear gear of R1 and R2 is preset, then, second solenoid directional control valve 21 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A rod chamber hydraulic fluid port B of the second two-way cylinder 14 is made to be in draining state simultaneously thus to make its piston rest in right position, 5th solenoid directional control valve 31 power-off is subsequently in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to right position through the oil inlet P of the 5th solenoid directional control valve 31 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the first unidirectional oil cylinder 24 to realize R1 and keep off transmission, make it be in left position to the first control port X fuel feeding of the first interlock valve 29 simultaneously, first hydraulic fluid port A ends, and the second hydraulic fluid port B is communicated with drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 can not form the transmission of the R2 that reverses gear all the time through the second hydraulic fluid port B of the first interlock valve 29 and drain tap T draining, thus avoid the transmission interference of reversing gear between R1 and R2.

When vehicle advances, manual guiding valve 12 is allocated to D position by N position, oil inlet P is communicated with the second hydraulic fluid port B, and the first hydraulic fluid port A is communicated with drain tap T, make the control port X of the first guiding valve 17 through the first hydraulic fluid port A of the hydraulic fluid port B of shuttle valve 16 and the first hydraulic fluid port A1, the oil pipe 202 that reverses gear, manual guiding valve 12 and drain tap T draining thus make it be in left position, the fluid of main fuel feeding oil pipe 201 handles the oil inlet P of control slide valve 12 and the second hydraulic fluid port B enters forward gear oil pipe 203, first solenoid directional control valve 20 power-off is in left position, hydraulic fluid port T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to through the oil inlet P of the first solenoid directional control valve 20 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the first two-way cylinder 13, and commutation that left position realizes forward gear D is put into gear, then, first solenoid directional control valve 20 energising is in right position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, makes the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 and rod chamber hydraulic fluid port B be in draining state simultaneously thus make its piston rest in left position, after this, second solenoid directional control valve 21 power-off is in left position, drain tap T is ended, and oil inlet P is communicated with its hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the second two-way cylinder 14, simultaneously through oil inlet P and the hydraulic fluid port A of the second solenoid directional control valve 21, the hydraulic fluid port A of the second guiding valve 18 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the second two-way cylinder 14, making its piston move to right position, to realize the gear of forward gear D1 and D5 preset, then, second solenoid directional control valve 21 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in right position, subsequently, 5th solenoid directional control valve 31 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to right position through the oil inlet P of the 5th solenoid directional control valve 31 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the first unidirectional oil cylinder 24 to realize D1 and keep off transmission, make it be in left position to the first control port X fuel feeding of the first interlock valve 29 simultaneously, first hydraulic fluid port A ends, and the second hydraulic fluid port B is communicated with drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 can not form the transmission of forward gear D5 all the time through the second hydraulic fluid port B of the first interlock valve 29 and drain tap T draining, thus the transmission avoided between forward gear D1 and D5 is interfered.

When changing to neutral by D1 gear, manual guiding valve 12 is allocated to N position by D position, oil inlet P is ended, and the first hydraulic fluid port A is communicated with drain tap T with the second hydraulic fluid port B simultaneously, reverse gear oil pipe 202 and the forward gear oil pipe 203 drain tap T draining simultaneously that is communicated with hydraulic fluid port B that make to be communicated with the first hydraulic fluid port A of manual guiding valve 12, now no matter the 5th solenoid directional control valve 31, 6th solenoid directional control valve 32, 7th solenoid directional control valve 33 and the 8th solenoid directional control valve 34 are in energising or off-position, the hydraulic fluid port A of the first unidirectional oil cylinder 24, the hydraulic fluid port A of the second unidirectional oil cylinder 25, the hydraulic fluid port A of the 3rd unidirectional the oil cylinder 26 and hydraulic fluid port A of the 4th unidirectional oil cylinder 27 is all in draining state, the transmission of any gear can not be formed thus achieve neutral.

When changing to D2 gear by D1 gear, 3rd solenoid directional control valve 22 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the 3rd solenoid directional control valve 22 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the 3rd two-way cylinder 15, simultaneously through oil inlet P and the hydraulic fluid port A of the 3rd solenoid directional control valve 22, the rodless cavity hydraulic fluid port A fuel feeding of the hydraulic fluid port A of the 3rd guiding valve 19 and hydraulic fluid port B to the 3rd two-way cylinder 15 makes its piston move to right position, and to realize the gear of forward gear D2 and D6 preset, then, 3rd solenoid directional control valve 22 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in right position, after this, 5th solenoid directional control valve 31 energising is in right position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the first unidirectional oil cylinder 24 make its piston move to left position through the hydraulic fluid port A of the 5th solenoid directional control valve 31 and drain tap T draining interrupts forward gear D1 transmission, make the first control port X of the first interlock valve 29 through the hydraulic fluid port A of the 5th solenoid directional control valve 31 and drain tap T draining simultaneously, subsequently, 7th solenoid directional control valve 33 energising is in right position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is through the oil inlet P of the 7th solenoid directional control valve 33 and hydraulic fluid port A, its piston the is moved to transmission that right position realizes forward gear D2 of the hydraulic fluid port A fuel feeding of first hydraulic fluid port A of parking valve 28 and the 3rd hydraulic fluid port A1 to the 3rd unidirectional oil cylinder 26, meanwhile, fluid in forward gear oil pipe 203 makes it be in left position through the oil inlet P of the 7th solenoid directional control valve 33 and the first control port X fuel feeding of hydraulic fluid port A to the second interlock valve 30, first hydraulic fluid port A ends, and the second hydraulic fluid port B is communicated with drain tap T, make the hydraulic fluid port A of the 4th unidirectional oil cylinder 27 can not form the transmission of forward gear D6 all the time through the second hydraulic fluid port B of the second interlock valve 30 and drain tap T draining, thus the transmission avoided between forward gear D2 and D6 is interfered.

When changing to D1 gear by D2 gear, the 7th solenoid directional control valve 33 power-off is in left position, subsequently the 5th solenoid directional control valve 31 power-off and is in left position, and namely interruptible price D2 keeps off power, realizes the transmission of D1 gear.

When changing to D3 gear by D2 gear, 4th solenoid directional control valve 23 energising is in right position, drain tap T ends, and oil inlet P is communicated with its hydraulic fluid port A, fluid in forward gear oil pipe 203 makes it be in right position through the oil inlet P of the 4th solenoid directional control valve 23 and the control port X fuel feeding of hydraulic fluid port A to the second guiding valve 18, hydraulic fluid port A ends, and hydraulic fluid port B is communicated with drain tap T, make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 by the hydraulic fluid port B of the second guiding valve 18 and drain tap T draining, after this, second solenoid directional control valve 21 power-off is in left position, drain tap T is ended, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to left position through the oil inlet P of the second solenoid directional control valve 21 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the second two-way cylinder 14, and to realize the gear of forward gear D3 and D7 preset, then, second solenoid directional control valve 21 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, meanwhile the 4th solenoid directional control valve 23 power-off is in left position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B be in draining state simultaneously thus make the second two-way cylinder 14 piston rest in left position, afterwards, 7th solenoid directional control valve 33 power-off is in left position, its oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 through the hydraulic fluid port A of the 7th solenoid directional control valve 33 and drain tap T draining thus make its piston move to transmission that forward gear D2 is interrupted in left position, meanwhile, the first control port X of the second interlock valve 30 is through the hydraulic fluid port A of the 7th solenoid directional control valve 33 and drain tap T draining, subsequently, 5th solenoid directional control valve 31 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is through make its piston the move to transmission that right position realizes forward gear D3 of the oil inlet P of the 5th solenoid directional control valve 31 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the first unidirectional oil cylinder 24, meanwhile it is made to be in left position to the first control port X fuel feeding of the first interlock valve 29, first hydraulic fluid port A ends, and the second hydraulic fluid port B is communicated with drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 can not form the transmission of forward gear D7 all the time through the second hydraulic fluid port B of the first interlock valve 29 and drain tap T draining, thus the transmission avoided between forward gear D3 and D7 is interfered.

When changing to D2 gear by D3 gear, the 5th solenoid directional control valve 31 energising is in right position, subsequently the 7th solenoid directional control valve 33 energising and is in right position, and namely interruptible price D3 keeps off power, realizes the transmission of D2 gear.

When changing to D4 gear by D3 gear, 4th solenoid directional control valve 23 energising is in right position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes it be in right position through the oil inlet P of the 4th solenoid directional control valve 23 and the control port X fuel feeding of hydraulic fluid port A to the 3rd guiding valve 19, hydraulic fluid port A ends, and hydraulic fluid port B is communicated with drain tap T, make the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 by the hydraulic fluid port B of the 3rd guiding valve 19 and drain tap T draining, after this, 3rd solenoid directional control valve 22 power-off is in left position, drain tap T ends, and oil inlet P is communicated with its hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to left position through the oil inlet P of the 3rd solenoid directional control valve 22 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the 3rd two-way cylinder 15, and to realize the gear of forward gear D4 and D8 preset, then, 3rd solenoid directional control valve 22 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, meanwhile the 4th solenoid directional control valve 23 power-off is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in left position, afterwards, 5th solenoid directional control valve 31 energising is in right position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the first unidirectional oil cylinder 24 make its piston move to left position through the hydraulic fluid port A of the 5th solenoid directional control valve 31 and drain tap T draining interrupts forward gear D3 transmission, meanwhile the first control port X of the first interlock valve 29 is through the hydraulic fluid port A of the 5th solenoid directional control valve 31 and drain tap T draining, 7th solenoid directional control valve 33 energising is subsequently in right position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is through the oil inlet P of the 7th solenoid directional control valve 33 and hydraulic fluid port A, its piston the is moved to transmission that right position realizes forward gear D4 of the hydraulic fluid port A fuel feeding of first hydraulic fluid port A of parking valve 28 and the 3rd hydraulic fluid port A1 to the 3rd unidirectional oil cylinder 26, fluid meanwhile in forward gear oil pipe 203 makes it be in left position through the oil inlet P of the 7th solenoid directional control valve 33 and the first control port X fuel feeding of hydraulic fluid port A to the second interlock valve 30, hydraulic fluid port A ends, and the second hydraulic fluid port B is communicated with drain tap T, make the hydraulic fluid port A of the 4th unidirectional oil cylinder 27 can not form the transmission of forward gear D8 all the time through the second hydraulic fluid port B of the second interlock valve 30 and drain tap T draining, thus the transmission avoided between forward gear D4 and D8 is interfered.

When changing to D3 gear by D4 gear, the 7th solenoid directional control valve 33 power-off is in left position, subsequently the 5th solenoid directional control valve 31 power-off and is in left position, and namely interruptible price D4 keeps off power, realizes the transmission of D3 gear.

When changing to D5 gear by D4 gear, second solenoid directional control valve 21 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the second two-way cylinder 14, fluid meanwhile in forward gear oil pipe 203 is through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A, the hydraulic fluid port A of the second guiding valve 18 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the second two-way cylinder 14, making the piston of the second two-way cylinder 14 move to right position, to realize the gear of forward gear D1 and D5 preset, then, second solenoid directional control valve 21 energising is in right position, its oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in right position, afterwards, 7th solenoid directional control valve 33 power-off is in left position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 through the hydraulic fluid port A of the 7th solenoid directional control valve 33 and drain tap T draining thus make its piston move to transmission that forward gear D2 is interrupted in left position, meanwhile the first control port X of the second interlock valve 30 is through the hydraulic fluid port A of the 7th solenoid directional control valve 33 and drain tap T draining, subsequently, 6th solenoid directional control valve 32 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is through make its piston the move to transmission that right position realizes forward gear D5 of the oil inlet P of the 6th solenoid directional control valve 32 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the second unidirectional oil cylinder 25, meanwhile its right position is made to the second control port Y fuel feeding of the first interlock valve 29, second hydraulic fluid port B ends, and the first hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the first unidirectional oil cylinder 24 can not form the transmission of forward gear D1 all the time through the first hydraulic fluid port A of the first interlock valve 29 and drain tap T draining, thus the transmission avoided between forward gear D5 and D1 is interfered.

When changing to D4 gear by D5 gear, the 6th solenoid directional control valve 32 energising is in right position, subsequently the 7th solenoid directional control valve 33 energising and is in right position, and namely interruptible price D5 keeps off power, realizes the transmission of D4 gear.

When changing to D6 gear by D5 gear, 3rd solenoid directional control valve 22 power-off is in left position, drain tap T ends, and oil inlet P is communicated with its hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the 3rd solenoid directional control valve 22 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the 3rd two-way cylinder 15, fluid meanwhile in forward gear oil pipe 203 is through the oil inlet P of the 3rd solenoid directional control valve 22 and hydraulic fluid port A, the hydraulic fluid port A of the 3rd guiding valve 19 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the 3rd two-way cylinder 15, making the piston of the 3rd two-way cylinder 15 move to right position, to realize the gear of forward gear D2 and D6 preset, then, 3rd solenoid directional control valve 22 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in right position, after this, 6th solenoid directional control valve 32 energising is in right position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 through the hydraulic fluid port A of the 6th solenoid directional control valve 32 and drain tap T draining thus make its piston move to transmission that forward gear D5 is interrupted in left position, meanwhile the second control port Y of the first interlock valve 29 is through the hydraulic fluid port A of the 6th solenoid directional control valve 32 and drain tap T draining, subsequently, 8th solenoid directional control valve 34 energising is in right position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is through the oil inlet P of the 8th solenoid directional control valve 34 and hydraulic fluid port A, its piston the is moved to transmission that right position realizes forward gear D6 of the hydraulic fluid port A fuel feeding of second hydraulic fluid port B of parking valve 28 and the 4th hydraulic fluid port B1 to the 4th unidirectional oil cylinder 27, meanwhile, fluid in forward gear oil pipe 203 makes it be in right position through the oil inlet P of the 8th solenoid directional control valve 34 and the second control port Y fuel feeding of hydraulic fluid port A to the second interlock valve 30, second hydraulic fluid port B ends, and the first hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 can not form the transmission of forward gear D2 all the time through the first hydraulic fluid port A of the second interlock valve 30 and hydraulic fluid port T draining, thus the transmission avoided between forward gear D6 and D2 is interfered.

When changing to D5 gear by D6 gear, the 8th solenoid directional control valve 34 power-off is in left position, subsequently the 6th solenoid directional control valve 32 power-off and is in left position, and namely interruptible price D6 keeps off power, realizes the transmission of D5 gear.

When changing to D7 gear by D6 gear, 4th solenoid directional control valve 23 energising is in right position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes it be in right position through the oil inlet P of the 4th solenoid directional control valve 23 and the control port X fuel feeding of hydraulic fluid port A to the second guiding valve 18, hydraulic fluid port A ends, and hydraulic fluid port B is communicated with drain tap T, make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 by the hydraulic fluid port B of the second guiding valve 18 and drain tap T draining, after this, second solenoid directional control valve 21 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to left position through the oil inlet P of the second solenoid directional control valve 21 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the second two-way cylinder 14, and to realize the gear of forward gear D3 and D7 preset, then, second solenoid directional control valve 21 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, meanwhile the 4th solenoid directional control valve 23 power-off is in left position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in left position, afterwards, 8th solenoid directional control valve 34 power-off is in left position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the 4th unidirectional oil cylinder 27 through the hydraulic fluid port A of the 8th solenoid directional control valve 34 and drain tap T draining thus make its piston move to transmission that forward gear D6 is interrupted in left position, meanwhile the second control port Y of the second interlock valve 30 is through the hydraulic fluid port A of the 8th solenoid directional control valve 34 and drain tap T draining, subsequently, 6th solenoid directional control valve 32 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the 6th solenoid directional control valve 32 and hydraulic fluid port A simultaneously to make its piston the move to transmission that right position realizes forward gear D7 of the hydraulic fluid port A fuel feeding of the second unidirectional oil cylinder 25, meanwhile it is made to be in right position to the second control port Y fuel feeding of the first interlock valve 29, second hydraulic fluid port B ends, and the first hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the first unidirectional oil cylinder 24 can not form the transmission of forward gear D3 all the time through the first hydraulic fluid port A of the first interlock valve 29 and drain tap T draining, thus the transmission avoided between forward gear D7 and D3 is interfered.

When changing to D6 gear by D7 gear, the 6th solenoid directional control valve 32 energising is in right position, subsequently the 8th solenoid directional control valve 34 energising and is in right position, and namely interruptible price D7 keeps off power, realizes the transmission of D6 gear.

When changing to D8 gear by D7 gear, 4th solenoid directional control valve 23 energising is in right position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes it be in right position through the oil inlet P of the 4th solenoid directional control valve 23 and the control port X fuel feeding of hydraulic fluid port A to the 3rd guiding valve 19, hydraulic fluid port A ends, and hydraulic fluid port B is communicated with drain tap T, make the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 by the hydraulic fluid port B of the 3rd guiding valve 19 and drain tap T draining, afterwards, 3rd solenoid directional control valve 22 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to left position through the oil inlet P of the 3rd solenoid directional control valve 22 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the 3rd two-way cylinder 15, and to realize the gear of forward gear D4 and D8 preset, then, 3rd solenoid directional control valve 22 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, meanwhile the 4th solenoid directional control valve 23 power-off is in left position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in left position, after this, 6th solenoid directional control valve 32 energising is in right position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 through the hydraulic fluid port A of the 6th solenoid directional control valve 32 and drain tap T draining thus make its piston move to transmission that forward gear D7 is interrupted in left position, meanwhile the second control port Y of the first interlock valve 29 is through the hydraulic fluid port A of the 6th solenoid directional control valve 32 and drain tap T draining, subsequently, 8th solenoid directional control valve 34 energising is in right position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is through the oil inlet P of the 8th solenoid directional control valve 34 and hydraulic fluid port A, its piston the is moved to transmission that right position realizes forward gear D8 of the hydraulic fluid port A fuel feeding of second hydraulic fluid port B of parking valve 28 and the 4th hydraulic fluid port B1 to the 4th unidirectional oil cylinder 27, meanwhile it is made to be in right position to the second control port Y fuel feeding of the second interlock valve 30, second hydraulic fluid port B ends, and the first hydraulic fluid port A is communicated with its drain tap T, make the hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 can not form the transmission of forward gear D4 all the time through the first hydraulic fluid port A of the second interlock valve 30 and drain tap T draining, thus the transmission avoided between forward gear D8 and D4 is interfered.

When changing to D7 gear by D8 gear, the 8th solenoid directional control valve 34 power-off is in left position, subsequently the 6th solenoid directional control valve 32 power-off and is in left position, and namely interruptible price D8 keeps off power, realizes the transmission of D7 gear.

" emergent limping " function under fail-safe mode: when motor and hydraulic pressure liquid-supplying system can normally work but transmission electronic control unit (TCU) breaks down, speed changer enters fail-safe condition; Now, manual guiding valve 12 must be placed in N position, oil inlet P cut-off before piloting engine, and the first hydraulic fluid port A is communicated with drain tap T with the second hydraulic fluid port B, make to reverse gear oil pipe 202 and forward gear oil pipe 203 are in draining state simultaneously simultaneously, after engine start and hydraulic pressure liquid-supplying system normally work, all solenoid directional control valves (20,21,22,23,31,32,33,34,35) were made all to be in off-position because transmission electronic control unit (TCU) loses efficacy.

When reversing gear under fail-safe mode, it is manual that guiding valve 12 is allocated to R position by N position, drain tap T ends, and oil inlet P is communicated with the first hydraulic fluid port A and the second hydraulic fluid port B simultaneously, after the fluid in main fuel feeding oil pipe 201 handles the oil inlet P of control slide valve 12, the first hydraulic fluid port A of handling control slide valve 12 respectively enters the second hydraulic fluid port B reversing gear oil pipe 202 and handle control slide valve 12 and enters forward gear oil pipe 203, entering the fluid that reverses gear in oil pipe 202 makes it be in right position through the first hydraulic fluid port A1 of shuttle valve 16 and the control port X fuel feeding of hydraulic fluid port B to the first guiding valve 17, drain tap T ends, and hydraulic fluid port A is communicated with hydraulic fluid port B, now because the first solenoid directional control valve 20 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 respectively through the oil inlet P of the first solenoid directional control valve 20 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the first two-way cylinder 13, meanwhile through oil inlet P and the hydraulic fluid port A of the first solenoid directional control valve 20, the hydraulic fluid port A of the first guiding valve 17 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the first two-way cylinder 13, make the piston of the first two-way cylinder 13 move to realize the reversing gear commutation of R of right position to put into gear, now, 4th solenoid directional control valve 23 is left position because power-off is in, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the control port X of the second guiding valve 18 is made to make the second guiding valve 18 be in left position through the hydraulic fluid port A of the 4th solenoid directional control valve 23 and drain tap T draining, drain tap T ends, and hydraulic fluid port A is communicated with its hydraulic fluid port B, second solenoid directional control valve 21 is left position because power-off is in, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, make fluid in forward gear oil pipe 203 respectively through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the second two-way cylinder 14, through oil inlet P and the hydraulic fluid port A of the second solenoid directional control valve 21, the hydraulic fluid port A of the second guiding valve 18 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the second two-way cylinder 14, make the piston of the second two-way cylinder 14 move to right position and realize reversing gear the putting into gear of R1 and R2, equally, 5th solenoid directional control valve 31 is left position because power-off is in, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to right position through the oil inlet P of the 5th solenoid directional control valve 31 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the first unidirectional oil cylinder 24 to realize reversing gear the transmission of R1, meanwhile to the first control port X fuel feeding of the first interlock valve 29, although now the 6th solenoid directional control valve 32 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, make fluid in forward gear oil pipe 203 equally can through the oil inlet P of the 6th solenoid directional control valve 32 and hydraulic fluid port A to the second control port Y fuel feeding of the first interlock valve 29, but because the oil inlet P through the 5th solenoid directional control valve 31 is equal with the oil pressure of hydraulic fluid port A to the second control port Y fuel feeding of the first interlock valve 29 with the oil inlet P through the 6th solenoid directional control valve 32 with the oil pressure of hydraulic fluid port A to the first control port X fuel feeding of the first interlock valve 29, under the return spring effect of the first interlock valve 29, make the first interlock valve 29 be in left position, first hydraulic fluid port A ends, and the second hydraulic fluid port B is communicated with drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 can not form the transmission of the R2 that reverses gear all the time through the first hydraulic fluid port A of the first interlock valve 29 and drain tap T draining, thus realize " emergent walk lamely " under fail-safe mode reverse gear R1 transmission time, avoid the transmission of reversing gear between R1 and R2 to interfere.

Under fail-safe mode during forward gear, manual guiding valve 12 is allocated to D position by N position, drain tap T is communicated with the first hydraulic fluid port A, oil inlet P is communicated with the second hydraulic fluid port B, make the control port X of the first guiding valve 17 through the hydraulic fluid port B of shuttle valve 16 and the first hydraulic fluid port A1 draining thus make it be in left position, hydraulic fluid port A ends, and hydraulic fluid port B is communicated with drain tap T, make the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 through the hydraulic fluid port B of the first guiding valve 17 and drain tap T draining, fluid simultaneously in main fuel feeding oil pipe 201 is handled the hydraulic fluid port P of control slide valve 12 and the second hydraulic fluid port B and is entered forward gear oil pipe 203, now the first solenoid directional control valve 20 because power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to through the oil inlet P of the first solenoid directional control valve 20 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the first two-way cylinder 13, and commutation that left position realizes forward gear D is put into gear, meanwhile, 4th solenoid directional control valve 23 is left position because power-off is in, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the control port X of the second guiding valve 18 is made to make it be in left position through the hydraulic fluid port A of the 4th solenoid directional control valve 23 and drain tap T draining, drain tap T ends, and hydraulic fluid port A is communicated with its hydraulic fluid port B, second solenoid directional control valve 21 is left position because power-off is in, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, make fluid in forward gear oil pipe 203 respectively through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the second two-way cylinder 14, through oil inlet P and the hydraulic fluid port A of the second solenoid directional control valve 21, the hydraulic fluid port A of the second guiding valve 18 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the second two-way cylinder 14, make the piston of the second two-way cylinder 14 move to right position and realize putting into gear of forward gear D1 and D5, equally, 5th solenoid directional control valve 31 is left position because power-off is in, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is through make its piston the move to transmission that right position realizes forward gear D1 of the oil inlet P of the 5th solenoid directional control valve 31 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the first unidirectional oil cylinder 24, meanwhile to the first control port X fuel feeding of the first interlock valve 29, although now the 6th solenoid directional control valve 32 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, make fluid in forward gear oil pipe 203 equally can through the oil inlet P of the 6th solenoid directional control valve 32 and hydraulic fluid port A to the second control port Y fuel feeding of the first interlock valve 29, but because the oil inlet P through the 5th solenoid directional control valve 31 is equal with the oil pressure of hydraulic fluid port A to the second control port Y fuel feeding of the first interlock valve 29 with the oil inlet P through the 6th solenoid directional control valve 32 with the oil pressure of hydraulic fluid port A to the first control port X fuel feeding of the first interlock valve 29, under the return spring effect of the first interlock valve 29, make the first interlock valve 29 be in left position, first hydraulic fluid port A ends, and the second hydraulic fluid port B is communicated with drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 can not form the transmission of forward gear D5 all the time through the first hydraulic fluid port A of the first interlock valve 29 and drain tap T draining, thus when realizing " emergent limping " the forward gear D1 transmission under fail-safe mode, the transmission avoided between forward gear D1 and D5 is interfered.

Hydraulic pressure parking function during P gear

Vehicle is converted to parked state by travelling state, need first to step on vehicle foot brake pedal and make car brakeing and after stopping, manual guiding valve 12 is placed in P position, drain tap T is communicated with the first hydraulic fluid port A, simultaneously oil inlet P be communicated with the second hydraulic fluid port B, under transmission electronic control unit (TCU) regulation and control, make all valves and oil cylinder all be returned to normality, now vehicle will be made to lose parking braking power as unclamped foot brake pedal, unclamp when transmission electronic control unit (TCU) detects foot brake pedal, when vehicle loses stopping power, the energising of control the 9th solenoid directional control valve 35 makes it be in right position by transmission electronic control unit (TCU), drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes it be in right position through the oil inlet P of the 9th solenoid directional control valve 35 and the control port X fuel feeding of hydraulic fluid port A to parking valve 28, first hydraulic fluid port A and the second hydraulic fluid port B ends simultaneously, and oil inlet P is communicated with the 3rd hydraulic fluid port A1 and the 4th hydraulic fluid port B1 simultaneously, fluid in forward gear oil pipe 203 is through the oil inlet P of the 9th solenoid directional control valve 35 and hydraulic fluid port A, two-way is divided into after the oil inlet P of parking valve 28, one road binders liquid makes its piston move to right position through the hydraulic fluid port A fuel feeding of the 3rd hydraulic fluid port A1 to the 3rd unidirectional oil cylinder 26 of parking valve 28, another road binders liquid makes its piston move to right position through the hydraulic fluid port A fuel feeding of the 4th hydraulic fluid port B1 to the 4th unidirectional oil cylinder 27 of parking valve 28, the effect of car brakeing owing to can produce when planetary gear train arbitrary in the parallel planetary gear train transmission that hydraulic control system involved in the present invention is supporting moves interference, therefore, make when the piston of the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 is in right position together in speed changer planetary gear train produce movement interference thus form the effect making car brakeing, hydraulic pressure parking function during P gear can be realized thus.

Ramp start assisting function

Vehicle reverse gear uphill starting time, it is manual that guiding valve 12 is placed in R position, drain tap T ends, and oil inlet P is communicated with the first hydraulic fluid port A and the second hydraulic fluid port B simultaneously, enters and reverse gear oil pipe 202 and enter forward gear oil pipe 203 through the second hydraulic fluid port B after the fluid in main fuel feeding oil pipe 201 handles the oil inlet P of control slide valve 12, respectively through the first hydraulic fluid port A, when transmission electronic control unit (TCU) detect vehicle have slip by slope forward trend time, first make car brakeing to prevent from slipping by slope by the control identical with the hydraulic pressure parking function formed when P keeps off, the fluid meanwhile reversed gear in oil pipe 202 through shuttle valve 16 the first hydraulic fluid port A1 and the control port X fuel feeding of hydraulic fluid port B to the first guiding valve 17 makes it be in right position, drain tap T ends, and hydraulic fluid port A is communicated with hydraulic fluid port B, first solenoid directional control valve 20 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the first solenoid directional control valve 20 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the first two-way cylinder 13, fluid simultaneously in forward gear oil pipe 203 is through the oil inlet P of the first solenoid directional control valve 20 and hydraulic fluid port A, the hydraulic fluid port A of the first guiding valve 17 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the first two-way cylinder 13, make the piston of the first two-way cylinder 13 move to realize the reversing gear commutation of R of right position to put into gear, then, first solenoid directional control valve 20 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in right position, after this, second solenoid directional control valve 21 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the second two-way cylinder 14, simultaneously through oil inlet P and the hydraulic fluid port A of the second solenoid directional control valve 21, the hydraulic fluid port P of the second guiding valve 18 and hydraulic fluid port A is to the rodless cavity hydraulic fluid port A fuel feeding of the second two-way cylinder 14, the gear of R1 and R2 of the piston of the second two-way cylinder 14 being moved to right realize to reverse gear is preset, then, second solenoid directional control valve 21 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in right position, subsequently, 9th solenoid directional control valve 35 power-off is in left position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the control port X of parking valve 28 make it be in left position, oil inlet P cut-off by the hydraulic fluid port A of the 9th solenoid directional control valve 35 and drain tap T draining, and the first hydraulic fluid port A is communicated with the 3rd hydraulic fluid port A1, the second hydraulic fluid port B is communicated with the 4th hydraulic fluid port B1, makes the piston of the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 move to left position thus brake off effect simultaneously, the 9th solenoid directional control valve 35 power-off moment the 5th solenoid directional control valve 31 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to right position through the oil inlet P of the 5th solenoid directional control valve 31 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the first unidirectional oil cylinder 24 to realize R1 and keep off transmission, thus realizes uphill starting when reversing gear.

During vehicle forward gear uphill starting, manual guiding valve 12 is placed in D position, oil inlet P is communicated with the second hydraulic fluid port B, first hydraulic fluid port A is communicated with drain tap T, make the control port X of the first guiding valve 17 through the hydraulic fluid port B of shuttle valve 16 and the first hydraulic fluid port A1, reverse gear oil pipe 202, first hydraulic fluid port A of manual guiding valve 12 and drain tap T draining thus make it be in left position, hydraulic fluid port A ends, and hydraulic fluid port B is communicated with drain tap T, make the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 through the hydraulic fluid port B of the first guiding valve 17 and drain tap T draining, the fluid of main fuel feeding oil pipe 201 handles the oil inlet P of control slide valve 12 and the second hydraulic fluid port B enters forward gear oil pipe 203 simultaneously, when transmission electronic control unit (TCU) detect vehicle have slip by slope trend backward time, first make car brakeing to prevent from slipping by slope by the control identical with the hydraulic pressure parking function formed when P keeps off, meanwhile the first solenoid directional control valve 20 power-off is in left position, hydraulic fluid port T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to through the oil inlet P of the first solenoid directional control valve 20 and the rod chamber hydraulic fluid port B fuel feeding of hydraulic fluid port A to the first two-way cylinder 13, and commutation that left position realizes forward gear D is put into gear, then, first solenoid directional control valve 20 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in left position, after this, second solenoid directional control valve 21 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A to the rod chamber hydraulic fluid port B fuel feeding of the second two-way cylinder 14, simultaneously through oil inlet P and the hydraulic fluid port A of the second solenoid directional control valve 21, the hydraulic fluid port A of the second guiding valve 18 and hydraulic fluid port B is to the rodless cavity hydraulic fluid port A fuel feeding of the second two-way cylinder 14, making the piston of the second two-way cylinder 14 move to right position, to realize the gear of forward gear D1 and D5 preset, then, second solenoid directional control valve 21 energising is in right position, oil inlet P is ended, and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B is made to be in draining state simultaneously thus to make its piston rest in right position, subsequently, 9th solenoid directional control valve 35 power-off is in left position, oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, make the control port X of parking valve 28 make it be in left position, oil inlet P cut-off by the hydraulic fluid port A of the 9th solenoid directional control valve 35 and drain tap T draining, and the first hydraulic fluid port A is communicated with the 3rd hydraulic fluid port A1, the second hydraulic fluid port B is communicated with the 4th hydraulic fluid port B1, makes the piston of the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 move to left position thus brake off effect simultaneously, the 9th solenoid directional control valve 35 power-off moment the 5th solenoid directional control valve 31 power-off is in left position, drain tap T ends, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to right position through the oil inlet P of the 5th solenoid directional control valve 31 and the hydraulic fluid port A fuel feeding of hydraulic fluid port A to the first unidirectional oil cylinder 24 to realize D1 and keep off transmission, thus uphill starting when realizing forward gear.

Claims

1. for the hydraulic control system of the speed changer of parallel planetary gear train, it is characterized in that: comprise three double-action rams, be respectively the first two-way cylinder (13), the second two-way cylinder (14) and the 3rd two-way cylinder (15); Four single-acting cylinders, are respectively the first unidirectional oil cylinder (24), the second unidirectional oil cylinder (25), the 3rd unidirectional oil cylinder (26) and the 4th unidirectional oil cylinder (27); Shuttle valve (16); Three external control types, 23 guiding valves led to, are respectively the first guiding valve (17), the second guiding valve (18) and the 3rd guiding valve (19); External control type 25 parking valves (28) led to; Two 23 interlock valve of leading to, are respectively the first interlock valve (29) and the second interlock valve (30); Nine 23 electric change valves, are respectively the first solenoid directional control valve (20), the second solenoid directional control valve (21), the 3rd solenoid directional control valve (22), the 4th solenoid directional control valve (23), the 5th solenoid directional control valve (31), the 6th solenoid directional control valve (32), the 7th solenoid directional control valve (33), the 8th solenoid directional control valve (34), the 9th solenoid directional control valve (35); Also comprise main fuel feeding oil pipe (201), the oil pipe that reverses gear (202), forward gear oil pipe (203), manual guiding valve (12) and oil groove (11);

The hydraulic fluid port A of described first two-way cylinder (13) rodless cavity is communicated with the hydraulic fluid port B of the first guiding valve (17), and the hydraulic fluid port B of rod chamber is communicated with the first hydraulic fluid port A of the first guiding valve (17) and the hydraulic fluid port A of the first solenoid directional control valve (20) simultaneously; The drain tap T of described first guiding valve (17) is communicated with oil groove (11), and control port X is communicated with the 3rd hydraulic fluid port B of shuttle valve (16); First hydraulic fluid port A1 of described shuttle valve (16) is communicated with one end of the oil pipe that reverses gear (202), and the second hydraulic fluid port A2 is communicated with the hydraulic fluid port A of the control port X of the second guiding valve (18), the control port X of the 3rd guiding valve (19) and the 4th solenoid directional control valve (23) simultaneously; The oil inlet P of described first solenoid directional control valve (20) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); The oil inlet P of described 4th solenoid directional control valve (23) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); When simultaneously to can make when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B fuel feeding its piston move to right position realize reverse gear R commutation put into gear, when to its rodless cavity hydraulic fluid port A draining, simultaneously to can make during its rod chamber hydraulic fluid port B fuel feeding its piston move to left position realize forward gear D commutation put into gear, when its piston rest can be made in present position to when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B draining simultaneously;

The hydraulic fluid port A of described second two-way cylinder (14) rodless cavity is communicated with the hydraulic fluid port B of the second guiding valve (18), and the hydraulic fluid port B of rod chamber is communicated with the hydraulic fluid port A of the second guiding valve (18) and the hydraulic fluid port A of the second solenoid directional control valve (21) simultaneously; The drain tap T of described second guiding valve (18) is communicated with oil groove (11); The oil inlet P of described second solenoid directional control valve (21) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); When to its piston can be made when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B fuel feeding to move to right position, to realize the gear of forward gear D1 or forward gear D5 or reverse gear R1 or the R2 that reverses gear preset simultaneously, when to its rodless cavity hydraulic fluid port A draining, to its piston can be made during its rod chamber hydraulic fluid port B fuel feeding to move to left position, to realize the gear of forward gear D3 or forward gear D7 preset simultaneously, when its piston rest can be made in present position to when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B draining simultaneously;

The hydraulic fluid port A of described 3rd two-way cylinder (15) rodless cavity is communicated with the hydraulic fluid port B of the 3rd guiding valve (19), and the hydraulic fluid port B of rod chamber is communicated with the hydraulic fluid port A of the 3rd guiding valve (19) and the hydraulic fluid port A of the 3rd solenoid directional control valve (22) simultaneously; The drain tap T of described 3rd guiding valve (19) is communicated with oil groove (11); The oil inlet P of described 3rd solenoid directional control valve (22) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); When to its piston can be made when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B fuel feeding to move to right position, to realize the gear of forward gear D2 or forward gear D6 preset simultaneously, when to its rodless cavity hydraulic fluid port A draining, to its piston can be made during its rod chamber hydraulic fluid port B fuel feeding to move to left position, to realize the gear of forward gear D4 or forward gear D8 preset simultaneously, when its piston rest can be made in present position to when its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B draining simultaneously;

The hydraulic fluid port A of described first unidirectional oil cylinder (24) is communicated with hydraulic fluid port A, the first control port X of the first interlock valve (29) and the hydraulic fluid port A of the 5th solenoid directional control valve (31) simultaneously; The oil inlet P of described 5th solenoid directional control valve (31) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); Its piston can be made to move to during hydraulic fluid port A fuel feeding to the first unidirectional oil cylinder (24) transmission that right position realizes reverse gear shift R1 or forward gear D1 or forward gear D3, can make its piston be displaced downwardly in action of reset spring the transmission that reverse gear shift R1 or forward gear D1 or forward gear D3 are interrupted in left position during hydraulic fluid port A draining to the first unidirectional oil cylinder (24);

The hydraulic fluid port A of described second unidirectional oil cylinder (25) is communicated with the second hydraulic fluid port B, the second control port Y of the first interlock valve (29) and the hydraulic fluid port A of the 6th solenoid directional control valve (32) simultaneously; The oil inlet P of described 6th solenoid directional control valve (32) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); The drain tap T of described first interlock valve (29) is communicated with oil groove (11); Its piston can be made during hydraulic fluid port A fuel feeding to the second unidirectional oil cylinder (25) to move to right position to realize reversing gear the transmission of R2 or forward gear D5 or forward gear D7, its piston can be made during hydraulic fluid port A draining to the second unidirectional oil cylinder (25) to be displaced downwardly to left position in action of reset spring and to interrupt reversing gear the transmission of R2 or forward gear D5 or forward gear D7;

The hydraulic fluid port A of described 3rd unidirectional oil cylinder (26) is communicated with the 3rd hydraulic fluid port A1 of parking valve (28), to its piston can be made to move to during its hydraulic fluid port A fuel feeding transmission that right position realizes forward gear D2 or forward gear D4, be displaced downwardly in action of reset spring the transmission that forward gear D2 or forward gear D4 is interrupted in left position to its piston can be made during its hydraulic fluid port A draining;

The hydraulic fluid port A of described 4th unidirectional oil cylinder (27) is communicated with the 4th hydraulic fluid port B1 of parking valve (28); First hydraulic fluid port A of described parking valve (28) is communicated with the first hydraulic fluid port A, the first control port X of the second interlock valve (30) and the hydraulic fluid port A of the 7th solenoid directional control valve (33) simultaneously, second hydraulic fluid port B of parking valve (28) is communicated with the second hydraulic fluid port B, the second control port Y of the second interlock valve (30) and the hydraulic fluid port A of the 8th solenoid directional control valve (34) simultaneously, and oil inlet P and the control port X of parking valve (28) are communicated with the hydraulic fluid port A of the 9th solenoid directional control valve (35) simultaneously; The drain tap T of described second interlock valve (30) is communicated with oil groove (11); The oil inlet P of described 7th solenoid directional control valve (33) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); The oil inlet P of described 8th solenoid directional control valve (34) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); The oil inlet P of described 9th solenoid directional control valve (35) is communicated with forward gear oil pipe (203), and drain tap T is communicated with oil groove (11); Its piston can be made to move to during hydraulic fluid port A fuel feeding to the 4th unidirectional oil cylinder (27) transmission that right position realizes forward gear D6 or forward gear D8, can make its piston be displaced downwardly in action of reset spring the transmission that forward gear D6 or forward gear D8 is interrupted in left position during hydraulic fluid port A draining to the 4th unidirectional oil cylinder (27).

2. the hydraulic control system of the speed changer for parallel planetary gear train according to claim 1, it is characterized in that: described three double-action rams are single-piston rod double-action ram, described four single-acting cylinders are the single-piston rod one-way cylinder of band spring reset.