CN103498821A

CN103498821A - Hydraulic control system used for speed changer of parallel planetary gear train

Info

Publication number: CN103498821A
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: 2014-01-08
Anticipated expiration: 2033-10-16
Also published as: CN103498821B

Abstract

The invention relates to a hydraulic control system used for a speed changer of a parallel planetary gear train. The hydraulic control system comprises three bi-directional acting oil cylinders, four single-way acting oil cylinders, a shuttle valve, three external control two-position three-way slide valve, an external control two-position five-way stopping valve, two two-position three-way interlock valve and nine two-position three-way magnetic exchange valves. The hydraulic control system further comprises a main feeding oil pipe, a reverse-gear oil pipe, a forward-gear oil pipe, a manual control slide valve and an oil groove. According to the hydraulic control system, the manual control slide valve can be controlled in a manual mode to enable the speed changer to have a parking state, a backing up state, a neutral-gear state and a forwarding state; through different valve position combinations of various valves in the hydraulic control system, the speed changer can achieve eight forward gears and two reverse gears, and preset of gear changing in a changing process of the forward gears can be achieved. When a TCU loses efficacy completely, the emergency limp function of forward-gear D1 and reverse-gear R1 running is achieved.

Description

The hydraulic control system of the speed changer that is for parallel planet wheel

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 planet wheel system.

Background technique

Transmission for vehicles is divided into manual transmission and automatic transmission.Manual transmission can only be shifted gears by operation manually, and automatic transmission 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 is generally realized with executive system by transmission electronic control unit (TCU) control gearshift is servo; Servo and the executive system of shifting gears can be divided into again electronic, pneumatic and hydraulic pressure three types, and what usually adopt at most is mainly hydraulic control system.In the servo and executive control system of hydraulic gear-shifting, according to control signal, servoelement and actuator's type, can be divided into again all-hydraulic control and the large class of electrichydraulic control two.All-hydraulic control refers to that control signal and servo implementation are all hydraulic way, owing to driver's operation intention, motor and vehicle operation state etc. all must being 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 be high, in the modern vehicle automatic shift control, no longer adopt; Electrichydraulic control is that the actuator of controlling the gearshift executive system as servo control element with solenoid valve realizes automatic speed changing, and what the most vehicle automatic transmission adopted is all this pattern.In the automatic speed changing electrohydraulic control system, the control mode according to solenoid valve to gear shifting actuating mechanism actuator oil circuit, can be divided into direct control type and indirect two kinds of fundamental types of control formula; Direct control type has been controlled gear shift with proportional electromagnetic valve and Multi-position electromagnetic valve to the actuator oil circuit, its advantage is that system architecture is relatively simple, the gearshift precision is high, response is fast, shortcoming is that used electromagnetic valve structure is complicated, manufacture cost is high, to magnetic valve performance and control accuracy require high, to the hydraulic oil pollution sensitivity, system failure rate is relatively high; The control formula is by utilizing electromagnetic switch valve simple in structure, solenoid directional control valve or PWM-type electromagnetic switch valve (PWM control) control to the servo guiding valve indirectly, indirectly control the actuator oil circuit and complete 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, to magnetic valve performance and control accuracy, require low, 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 control two kinds of patterns, also can form and mix control formula hydraulic control system, be characterized in the direct control section actuator of solenoid directional control valve simple in structure oil circuit, simultaneously by utilizing simple electromagnetic switch valve, solenoid directional control valve or PWM-type electromagnetic switch valve (PWM control) control to the servo guiding valve, indirectly control other a part of actuator oil circuit, thereby the mixing type hydraulic control system has direct control and the indirect characteristics of controlling two kinds of patterns 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 for having 2, to reverse gear and the parallel planet wheel of 8 forward gears is the hydraulic control system of speed changer.

The hydraulic control system that is speed changer for parallel planet wheel comprises three double-action rams, is respectively the first two-way cylinder 13, the second two-way cylinder 14 and the 3rd two-way cylinder 15; Four single-acting cylinders, be respectively unidirectional oil cylinder the 25, the 3rd unidirectional oil cylinder 26 of the first unidirectional oil cylinder 24, second and the 4th unidirectional oil cylinder 27; Shuttle valve 16; The guiding valve that 2 of three external control types 3 are logical, be respectively the first guiding valve 17, the second guiding valve 18 and the 3rd guiding valve 19; The Parking valve 28 that 2 of external control types 5 are logical; Two 23 logical interlock valve, be respectively the first interlock valve 29 and the second interlock valve 30; Nine 23 electric change valves, be 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 202 that reverses gear, forward gear oil pipe 203, manual guiding valve 12 and oil groove 11;

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

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

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

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

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

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

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

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

Useful technique effect of the present invention embodies in the following areas:

1. hydraulic control system involved in the present invention, can with there are 2 and reverse gear and the parallel planet wheel of 8 forward gears is that speed changer is supporting;

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

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

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

5. hydraulic control system involved in the present invention, by controlling the valve position of 25 logical Parking valves 28 of external control type, can make speed changer have the 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, after the transmission electronic control unit (TCU) for controlling nine solenoid directional control valves (20,21,22,23,31,32,33,34,35) adds automatic shift control software, can realize 2 of speed changers reverse gear between or the automatic speed changing between 8 forward gears.

The accompanying drawing explanation

Fig. 1 is structural representation of the present invention.

Sequence number in Fig. 1: oil groove 11, manual guiding valve 12, the first two-way cylinder 13, the second two-way cylinder 14, the 3rd two-way cylinder 15, shuttle valve 16, the first guiding valve 17, the second guiding valve 18, the 3rd guiding valve 19, 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 first unidirectional oil cylinder 24, the second unidirectional oil cylinder 25, the 3rd unidirectional oil cylinder 26, the 4th unidirectional oil cylinder 27, Parking valve 28, the first interlock valve 29, the second interlock valve 30, 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, main fuel feeding oil pipe 201, oil pipe 202 reverses gear, forward gear oil pipe 203.

Embodiment

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

Embodiment

Referring to Fig. 1, the hydraulic control system of the speed changer that is for parallel planet wheel comprises three double-action rams, is respectively the first two-way cylinder 13, the second two-way cylinder 14 and the 3rd two-way cylinder 15; Four single-acting cylinders, be respectively unidirectional oil cylinder the 25, the 3rd unidirectional oil cylinder 26 of the first unidirectional oil cylinder 24, second and the 4th unidirectional oil cylinder 27; Shuttle valve 16; The guiding valve that 2 of three external control types 3 are logical, be respectively the first guiding valve 17, the second guiding valve 18 and the 3rd guiding valve 19; The Parking valve 28 that 2 of external control types 5 are logical; Two 23 logical interlock valve, be respectively the first interlock valve 29 and the second interlock valve 30; Nine 23 electric change valves, be 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 202 that reverses gear, forward gear oil pipe 203, manual guiding valve 12 and oil groove 11;

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

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

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

Working principle of the present invention is as follows:

Referring to Fig. 1, during engine start, manual guiding valve 12 must be placed in the P position; After engine start enters normal idle running, by transmission electronic control unit (TCU), control each solenoid valve, guiding valve and oil cylinder are in the normal state.The normality of the first solenoid directional control valve 20 for energising in the position, left and right, oil inlet P cut-off, hydraulic fluid port A be communicated with drain tap T, makes the rod chamber hydraulic fluid port B of the first two-way cylinder 13 of being communicated with the hydraulic fluid port A of the first solenoid directional control valve 20 can pass through the hydraulic fluid port A of the first solenoid directional control valve 20 and the drain tap T draining of the first solenoid directional control valve 20.The control port X of the first guiding valve 17 is by hydraulic fluid port B 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 of shuttle valve 16, therefore the normality of the first guiding valve 17 be left position, hydraulic fluid port A cut-off simultaneously hydraulic fluid port B be communicated with its drain tap T, make the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 of being communicated with the hydraulic fluid port B of the first guiding valve 17 can pass through hydraulic fluid port B and the drain tap T draining of the first guiding valve 17.The normality of the second solenoid directional control valve 21 for energising in the 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 of being communicated with the hydraulic fluid port A of the second solenoid directional control valve 21 can pass through hydraulic fluid port A and the drain tap T draining of the second solenoid directional control valve 21.The normality of the second guiding valve 18 be left position, drain tap T cut-off simultaneously hydraulic fluid port B be communicated with its hydraulic fluid port A, make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 of being communicated with the hydraulic fluid port B of the second guiding valve 18 can pass through hydraulic fluid port A and the drain tap T draining of the hydraulic fluid port B of the second guiding valve 18 and hydraulic fluid port A, the second solenoid directional control valve 21.The normality of the 3rd solenoid directional control valve 22 for energising in the 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 that is communicated with the hydraulic fluid port A of the 3rd solenoid directional control valve 22 can pass through hydraulic fluid port A and the hydraulic fluid port T draining of the 3rd solenoid directional control valve 22.The normality of the 3rd guiding valve 19 be left position, its hydraulic fluid port T cut-off simultaneously hydraulic fluid port B be communicated with hydraulic fluid port A, make the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 that is communicated with the hydraulic fluid port B of the 3rd guiding valve 19 can pass through hydraulic fluid port A and the drain tap T draining of the hydraulic fluid port B of the 3rd guiding valve 19 and hydraulic fluid port A, the 3rd solenoid directional control valve 22.The normality of the 4th solenoid directional control valve 23 is ended in left position, oil inlet P for outage, and hydraulic fluid port A is communicated with drain tap T, the control port X of the second guiding valve 18 that the while is communicated with the hydraulic fluid port A of the 4th solenoid directional control valve 23 and the control port X of the 3rd guiding valve 19 can pass through hydraulic fluid port A and the drain tap T draining of the 4th solenoid directional control valve 23, thereby make the second guiding valve 18 and the 3rd guiding valve 19 remain on normality position, left position.The normality of the 5th solenoid directional control valve 31 is ended in right position, oil inlet P for energising, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the first unidirectional oil cylinder 24 of being communicated with the hydraulic fluid port A of the 5th solenoid directional control valve 31 and the first control port X of the first interlock valve 29 can pass through hydraulic fluid port A and the drain tap T draining of the 5th solenoid directional control valve 31.The normality of the 6th solenoid directional control valve 32 is ended in right position, oil inlet P for energising, and hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the second unidirectional oil cylinder 25 of being communicated with the hydraulic fluid port A of the 6th solenoid directional control valve 32 and the second control port Y of the first interlock valve 29 can pass through hydraulic fluid port A and the drain tap T draining of the 6th solenoid directional control valve 32.The normality of the first interlock valve 29 is left position, the first hydraulic fluid port A cut-off, 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 the pressure release state simultaneously.The normality of the 7th solenoid directional control valve 33 is ended in left position, oil inlet P for outage, and hydraulic fluid port A is communicated with drain tap T, make hydraulic fluid port A and the drain tap T draining of the 3rd hydraulic fluid port A1 that the hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 that is communicated with the 3rd hydraulic fluid port A1 of Parking valve 28 can be by Parking valve 28 and the first filler opening A, the 7th solenoid directional control valve 33, also make the first control port X of the second interlock valve 30 of being communicated with the hydraulic fluid port A of the 7th solenoid directional control valve 33 can pass through hydraulic fluid port A and the drain tap T draining of the 7th solenoid directional control valve 33 simultaneously.The normality of the 8th solenoid directional control valve 34 is ended in left position, oil inlet P for outage, and hydraulic fluid port A is communicated with drain tap T, make hydraulic fluid port A and the drain tap T draining of the 4th hydraulic fluid port B1 that the hydraulic fluid port A of the 4th unidirectional oil cylinder 27 that is communicated with the 4th hydraulic fluid port B1 of Parking valve 28 can be by Parking valve 28 and the second hydraulic fluid port B, the 8th solenoid directional control valve 34, also make the second control port Y of the second interlock valve 30 of being communicated with the hydraulic fluid port A of the 8th solenoid directional control valve 34 can pass through hydraulic fluid port A and the drain tap T draining of the 8th solenoid directional control valve 34 simultaneously.The normality of the second interlock valve 30 is left position, the first hydraulic fluid port A cut-off, 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 the pressure release state simultaneously.The normality of the 9th solenoid directional control valve 35 is ended in left position, oil inlet P for outage, and hydraulic fluid port A is communicated with drain tap T, make the control port X of the Parking valve 28 that is communicated with the hydraulic fluid port A of the 9th solenoid directional control valve 35 can pass through hydraulic fluid port A and the drain tap T draining of the 9th solenoid directional control valve 35.The normality of Parking valve 28 is that left position, the first hydraulic fluid port A are 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, for right position, the first hydraulic fluid port A and the second hydraulic fluid port B end simultaneously, 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; The normality of the first two-way cylinder 13, the second two-way cylinder 14 and the 3rd two-way cylinder 15 is for being still in meta N position; The normality of unidirectional oil cylinder the 25, the 3rd unidirectional oil cylinder 26 of the first unidirectional oil cylinder 24, second 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 control port X of the first guiding valve 17 by the hydraulic fluid port B of shuttle valve 16, the first hydraulic fluid port A1, oil pipe 202 reverses gear, thereby the first hydraulic fluid port A of manual guiding valve 12 and drain tap T draining make the first guiding valve 17 in left position, hydraulic fluid port B is communicated with drain tap T, main fuel feeding oil pipe 201 is handled the oil inlet P of control slide valve 12, the second hydraulic fluid port B is to forward gear oil pipe 203 fuel feeding, regulation and control by transmission electronic control unit (TCU), make each solenoid valve, guiding valve and oil cylinder are all in normality separately.

During reversing, manual guiding valve 12 is allocated to the R position by the P position, drain tap T cut-off, oil inlet P are communicated with the first hydraulic fluid port A and its second hydraulic fluid port B simultaneously, after the fluid in main fuel feeding oil pipe 201 is handled the drain tap P of control slide valve 12, enter and reverse gear oil pipe 202 and enter forward gear oil pipe 203 through the second hydraulic fluid port B through the first hydraulic fluid port A respectively, enter fluid in the oil pipe 202 that reverses gear 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 its in right position, drain tap T cut-off and hydraulic fluid port A be communicated with hydraulic fluid port B, the first solenoid directional control valve 20 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the first two-way cylinder 13 through the oil inlet P of the first solenoid directional control valve 20 and hydraulic fluid port A, and the while is 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 the hydraulic fluid port B rodless cavity hydraulic fluid port A fuel feeding to the first two-way cylinder 13, making the piston of the first two-way cylinder 13 move to realize the reversing gear commutation of R of right position puts into gear, then, the first solenoid directional control valve 20 energisings are 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 simultaneously in the draining state, thereby the piston that makes the first two-way cylinder 13 is still in right position, after this, the second solenoid directional control valve 21 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the second two-way cylinder 14 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A, meanwhile 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 are preset to the rodless cavity hydraulic fluid port A fuel feeding of the second two-way cylinder 14 its piston is moved to right realize the to reverse gear gear of R1 and R2, then, the second solenoid directional control valve 21 energisings are 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 simultaneously in the draining state, thereby the piston that makes the second two-way cylinder 14 is still in right position, subsequently, the 5th solenoid directional control valve 31 outages are in left position, drain tap T cut-off, 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 hydraulic fluid port A to the hydraulic fluid port A fuel feeding of the first unidirectional oil cylinder 24 and realizes the transmission of R1 gear, meanwhile to the first control port X fuel feeding of the first interlock valve 29, make it in left position, the first hydraulic fluid port A cut-off, and the second hydraulic fluid port B is communicated with its drain tap T, the hydraulic fluid port A that makes the second unidirectional oil cylinder 25 is all the time through the second hydraulic fluid port B of the first interlock valve 29 and drain tap T draining and can not form the transmission of the R2 that reverses gear, thereby the transmission of having avoided reversing gear between R1 and R2 is interfered.

While by the R1 gear, changing to the R2 gear, the 5th solenoid directional control valve 31 energisings end in right position, oil inlet P, and hydraulic fluid port A is communicated with the first control port X of drain tap T, the hydraulic fluid port A that makes 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, make the piston of the first unidirectional oil cylinder 24 move to the transmission of left position interruption R1 gear, subsequently, the 6th solenoid directional control valve 32 outages are in left position, drain tap T cut-off, 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 hydraulic fluid port A to the hydraulic fluid port A fuel feeding of the second unidirectional oil cylinder 25 and realizes the transmission of R2 gear, meanwhile to the second control port Y fuel feeding of the first interlock valve 29, make it in right position, the second hydraulic fluid port B cut-off, and the first hydraulic fluid port A is communicated with drain tap T, the hydraulic fluid port A that makes the first unidirectional oil cylinder 24 is all the time through the first hydraulic fluid port A of the first interlock valve 29 and drain tap T draining and can not form the transmission of the R1 that reverses gear, thereby the transmission of having avoided reversing gear between R2 and R1 is interfered.

While by the R2 gear, changing to the R1 gear, the 6th solenoid directional control valve 32 is switched in right position, the 5th solenoid directional control valve 31 cuts off the power supply in left position subsequently, can interrupt R2 gear power, realize that R1 keeps off transmission.

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

While by reversing gear, changing to neutral, manual guiding valve 12 is allocated to the N position by the R position, the oil inlet P cut-off, and the first hydraulic fluid port A and the second hydraulic fluid port B are communicated with drain tap T simultaneously, make the forward gear oil pipe that reverses gear oil pipe 202 and be communicated with the second hydraulic fluid port B 203 be communicated with the first hydraulic fluid port A simultaneously through drain tap T draining, the 5th solenoid directional control valve 31 no matter now, the 6th solenoid directional control valve 32, the 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 hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 is all in the draining state, thereby the transmission that can not form any gear has realized neutral.

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

When vehicle advances, manual guiding valve 12 by the N position be allocated to the D 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, thereby the control port X that makes the first guiding valve 17 makes it in left position through the first hydraulic fluid port A and the drain tap T draining 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, oil inlet P and the second hydraulic fluid port B that the fluid of main fuel feeding oil pipe 201 is handled control slide valve 12 enter forward gear oil pipe 203, the first solenoid directional control valve 20 outages end in left position, hydraulic fluid port T, 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 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 realizes that the commutation of forward gear D puts into gear, then, the first solenoid directional control valve 20 energisings end in right position, oil inlet P, thereby and hydraulic fluid port A is communicated with drain tap T, the rodless cavity hydraulic fluid port A that makes the first two-way cylinder 13 and rod chamber hydraulic fluid port B makes its piston be still in left position in the draining state simultaneously, after this, the second solenoid directional control valve 21 outages are in left position, make drain tap T cut-off, and oil inlet P is communicated with its hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the second two-way cylinder 14 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A, while is 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 the hydraulic fluid port B rodless cavity hydraulic fluid port A fuel feeding to the second two-way cylinder 14, make its piston move to right position and realize that the gear of forward gear D1 and D5 is preset, then, the second solenoid directional control valve 21 energisings are in right position, the oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, thereby make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B in the draining state, make its piston be still in right position simultaneously, subsequently, the 5th solenoid directional control valve 31 outages are in left position, drain tap T cut-off, 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 hydraulic fluid port A to the hydraulic fluid port A fuel feeding of the first unidirectional oil cylinder 24 and realizes the transmission of D1 gear, to the first control port X fuel feeding of the first interlock valve 29, make it in left position simultaneously, the first hydraulic fluid port A cut-off, and the second hydraulic fluid port B is communicated with drain tap T, the hydraulic fluid port A that makes the second unidirectional oil cylinder 25 is all the time through the second hydraulic fluid port B of the first interlock valve 29 and drain tap T draining and can not form the transmission of forward gear D5, thereby avoided the transmission between forward gear D1 and D5 to interfere.

While by the D1 gear, changing to neutral, manual guiding valve 12 is allocated to the N position by the D position, the oil inlet P cut-off, and the first hydraulic fluid port A and the second hydraulic fluid port B are communicated with drain tap T simultaneously, make 203 while of the forward gear oil pipe that reverses gear oil pipe 202 and be communicated with the hydraulic fluid port B drain tap T draining be communicated with the first hydraulic fluid port A of manual guiding valve 12, the 5th solenoid directional control valve 31 no matter now, the 6th solenoid directional control valve 32, the 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 hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 is all in the draining state, thereby the transmission that can not form any gear has realized neutral.

While by the D1 gear, changing to the D2 gear, the 3rd solenoid directional control valve 22 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the 3rd two-way cylinder 15 through the oil inlet P of the 3rd solenoid directional control valve 22 and hydraulic fluid port A, while is through oil inlet P and the hydraulic fluid port A of the 3rd solenoid directional control valve 22, the hydraulic fluid port A of the 3rd guiding valve 19 and hydraulic fluid port B make its piston move to right position to the rodless cavity hydraulic fluid port A fuel feeding of the 3rd two-way cylinder 15 and realize that the gear of forward gear D2 and D6 is preset, then, the 3rd solenoid directional control valve 22 energisings are in right position, the oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, thereby make the rodless cavity hydraulic fluid port A of the 3rd two-way cylinder 15 and rod chamber hydraulic fluid port B in the draining state, make its piston be still in right position simultaneously, after this, the 5th solenoid directional control valve 31 energisings end in right position, oil inlet P, 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 interruption forward gear D1 transmission through hydraulic fluid port A and the drain tap T draining of the 5th solenoid directional control valve 31, makes hydraulic fluid port A and the drain tap T draining of the first control port X of the first interlock valve 29 through the 5th solenoid directional control valve 31 simultaneously, subsequently, the 7th solenoid directional control valve 33 energisings are in right position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is through oil inlet P and the hydraulic fluid port A of the 7th solenoid directional control valve 33, the first hydraulic fluid port A of Parking valve 28 and the 3rd hydraulic fluid port A1 make its piston move to the transmission that forward gear D2 is realized in right position to the hydraulic fluid port A fuel feeding of the 3rd unidirectional oil cylinder 26, meanwhile, fluid in forward gear oil pipe 203 makes it in left position through the oil inlet P of the 7th solenoid directional control valve 33 and hydraulic fluid port A to the first control port X fuel feeding of the second interlock valve 30, the first hydraulic fluid port A cut-off, and the second hydraulic fluid port B is communicated with drain tap T, the hydraulic fluid port A that makes the 4th unidirectional oil cylinder 27 is all the time through the second hydraulic fluid port B of the second interlock valve 30 and drain tap T draining and can not form the transmission of forward gear D6, thereby avoided the transmission between forward gear D2 and D6 to interfere.

While by the D2 gear, changing to the D1 gear, the 7th solenoid directional control valve 33 cuts off the power supply in left position, the 5th solenoid directional control valve 31 cuts off the power supply in left position subsequently, can interrupt D2 gear power, realize that D1 keeps off transmission.

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

While by the D3 gear, changing to the D2 gear, the 5th solenoid directional control valve 31 is switched in right position, the 7th solenoid directional control valve 33 is switched in right position subsequently, can interrupt D3 gear power, realize that D2 keeps off transmission.

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

While by the D4 gear, changing to the D3 gear, the 7th solenoid directional control valve 33 cuts off the power supply in left position, the 5th solenoid directional control valve 31 cuts off the power supply in left position subsequently, can interrupt D4 gear power, realize that D3 keeps off transmission.

While by the D4 gear, changing to the D5 gear, the second solenoid directional control valve 21 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the second two-way cylinder 14 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A, meanwhile the fluid in forward gear oil pipe 203 is 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 the hydraulic fluid port B rodless cavity hydraulic fluid port A fuel feeding to the second two-way cylinder 14, make the piston of the second two-way cylinder 14 move to right position and realize that the gear of forward gear D1 and D5 is preset, then, the second solenoid directional control valve 21 energisings are in right position, make its oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, thereby make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B in the draining state, make its piston be still in right position simultaneously, afterwards, the 7th solenoid directional control valve 33 outages end in left position, oil inlet P,, and thereby hydraulic fluid port A is communicated with drain tap T, make the hydraulic fluid port A of the 3rd unidirectional oil cylinder 26 make its piston move to the transmission of left position interruption forward gear D2 through hydraulic fluid port A and the drain tap T draining of the 7th solenoid directional control valve 33, meanwhile the first control port X of the second interlock valve 30 is through hydraulic fluid port A and the drain tap T draining of the 7th solenoid directional control valve 33, subsequently, the 6th solenoid directional control valve 32 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to the transmission that forward gear D5 is realized in right position through the oil inlet P of the 6th solenoid directional control valve 32 and hydraulic fluid port A to the hydraulic fluid port A fuel feeding of the second unidirectional oil cylinder 25, meanwhile the second control port Y fuel feeding of the first interlock valve 29 made to its right position, the second hydraulic fluid port B cut-off, and the first hydraulic fluid port A is communicated with drain tap T, the hydraulic fluid port A that makes the first unidirectional oil cylinder 24 is all the time through the first hydraulic fluid port A of the first interlock valve 29 and drain tap T draining and can not form the transmission of forward gear D1, thereby avoided the transmission between forward gear D5 and D1 to interfere.

While by the D5 gear, changing to the D4 gear, the 6th solenoid directional control valve 32 is switched in right position, the 7th solenoid directional control valve 33 is switched in right position subsequently, can interrupt D5 gear power, realize that D4 keeps off transmission.

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

While by the D6 gear, changing to the D5 gear, the 8th solenoid directional control valve 34 cuts off the power supply in left position, the 6th solenoid directional control valve 32 cuts off the power supply in left position subsequently, can interrupt D6 gear power, realize that D5 keeps off transmission.

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

While by the D7 gear, changing to the D6 gear, the 6th solenoid directional control valve 32 is switched in right position, the 8th solenoid directional control valve 34 is switched in right position subsequently, can interrupt D7 gear power, realize that D6 keeps off transmission.

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

While by the D8 gear, changing to the D7 gear, the 8th solenoid directional control valve 34 cuts off the power supply in left position, the 6th solenoid directional control valve 32 cuts off the power supply in left position subsequently, can interrupt D8 gear power, realize that D7 keeps off transmission.

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

While reversing gear under the fail safe pattern, manual guiding valve 12 is allocated to R position, drain tap T cut-off by the N position, 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 is handled the oil inlet P of control slide valve 12, the first hydraulic fluid port A of handling respectively control slide valve 12 enters the second hydraulic fluid port B that reverses gear oil pipe 202 and handle control slide valve 12 and enter forward gear oil pipe 203, entering fluid in the oil pipe 202 that reverses gear makes it in right position 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, drain tap T cut-off, and hydraulic fluid port A is communicated with hydraulic fluid port B, now because of the first solenoid directional control valve 20, cut off the power supply in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the first two-way cylinder 13 through the oil inlet P of the first solenoid directional control valve 20 and hydraulic fluid port A respectively, 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 the hydraulic fluid port B rodless cavity hydraulic fluid port A fuel feeding to the first two-way cylinder 13, making the piston of the first two-way cylinder 13 move to realize the reversing gear commutation of R of right position puts into gear, now, the 4th solenoid directional control valve 23 is because cutting off the power supply in left position, the oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, the control port X that makes the second guiding valve 18 makes the second guiding valve 18 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 cut-off, and hydraulic fluid port A is communicated with its hydraulic fluid port B, the second solenoid directional control valve 21 is because cutting off the power supply in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, make fluid in the forward gear oil pipe 203 rod chamber hydraulic fluid port B fuel feeding to the second two-way cylinder 14 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A respectively, oil inlet P and hydraulic fluid port A through the second solenoid directional control valve 21, the hydraulic fluid port A of the second guiding valve 18 and the hydraulic fluid port B rodless cavity hydraulic fluid port A fuel feeding to the second two-way cylinder 14, make the piston of the second two-way cylinder 14 move to right position the putting into gear of R1 and R2 of realizing reversing gear, equally, the 5th solenoid directional control valve 31 is because cutting off the power supply in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes its piston move to realize the reversing gear transmission of R1 of right position through the oil inlet P of the 5th solenoid directional control valve 31 and hydraulic fluid port A to the hydraulic fluid port A fuel feeding of 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 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, make fluid in forward gear oil pipe 203 equally can be through the oil inlet P of the 6th solenoid directional control valve 32 and hydraulic fluid port A the second control port Y fuel feeding to the first interlock valve 29, but because the oil inlet P through the 5th solenoid directional control valve 31 and hydraulic fluid port A equate the oil pressure of the second control port Y fuel feeding of the first interlock valve 29 oil pressure of the first control port X fuel feeding of the first interlock valve 29 and oil inlet P through the 6th solenoid directional control valve 32 and hydraulic fluid port A, under the return spring effect of the first interlock valve 29, make the first interlock valve 29 in left position, the first hydraulic fluid port A cut-off, and the second hydraulic fluid port B is communicated with drain tap T, the hydraulic fluid port A that makes the second unidirectional oil cylinder 25 is all the time through the first hydraulic fluid port A of the first interlock valve 29 and drain tap T draining and can not form the transmission of the R2 that reverses gear, thereby " the emergent limping " under realizing the fail safe pattern is while reversing gear the R1 transmission, the transmission of having avoided reversing gear between R1 and R2 is interfered.

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

Hydraulic pressure parking function during the P gear

Vehicle is converted to the Parking state by travelling state, after need at first stepping on the vehicle foot brake pedal and making car brakeing and stop, manual guiding valve 12 is placed in to P position, drain tap T are communicated with the first hydraulic fluid port A, oil inlet P is communicated with the second hydraulic fluid port B simultaneously, under transmission electronic control unit (TCU) regulation and control, makes all valves and oil cylinder all be returned to normality, now as unclamped foot brake pedal, will make vehicle lose parking braking power, when detecting foot brake pedal, unclamps transmission electronic control unit (TCU), when vehicle loses stopping power, transmission electronic control unit (TCU) will be controlled the 9th solenoid directional control valve 35 energisings makes it in right position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 makes it in right position through the oil inlet P of the 9th solenoid directional control valve 35 and hydraulic fluid port A to the control port X fuel feeding of Parking valve 28, the first hydraulic fluid port A and the second hydraulic fluid port B end 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 oil inlet P and the hydraulic fluid port A of the 9th solenoid directional control valve 35, be divided into two-way after the oil inlet P of Parking valve 28, one road binders liquid makes its piston move to right position through the 3rd hydraulic fluid port A1 of Parking valve 28 to the hydraulic fluid port A fuel feeding of the 3rd unidirectional oil cylinder 26, another road binders liquid makes its piston move to right position through the 4th hydraulic fluid port B1 of Parking valve 28 to the hydraulic fluid port A fuel feeding of the 4th unidirectional oil cylinder 27, because the supporting parallel planet wheel of hydraulic control system involved in the present invention is that in speed changer, arbitrary planetary gear train moves while interfering that can to produce be the effect of car brakeing, therefore, thereby when being in right position together, the piston of the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 make a planetary gear train in speed changer produce the effect that movement interference formation makes car brakeing, the hydraulic pressure parking function in the time of can realizing thus the P gear.

Ramp start assisting function

When vehicle reverses gear uphill starting, manual guiding valve 12 is placed in R position, drain tap T cut-off, 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 is handled the oil inlet P of control slide valve 12, enter and reverse gear oil pipe 202 and enter forward gear oil pipe 203 through the second hydraulic fluid port B through the first hydraulic fluid port A respectively, when detecting vehicle, transmission electronic control unit (TCU) has while slipping forward slope trend, at first by the hydraulic pressure parking function when forming the P gear, identical control makes car brakeing to prevent from slipping slope, the fluid meanwhile 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 its in right position, drain tap T cut-off, and hydraulic fluid port A is communicated with hydraulic fluid port B, the first solenoid directional control valve 20 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the first two-way cylinder 13 through the oil inlet P of the first solenoid directional control valve 20 and hydraulic fluid port A, fluid in forward gear oil pipe 203 is through oil inlet P and the hydraulic fluid port A of the first solenoid directional control valve 20 simultaneously, the hydraulic fluid port A of the first guiding valve 17 and the hydraulic fluid port B rodless cavity hydraulic fluid port A fuel feeding to the first two-way cylinder 13, making the piston of the first two-way cylinder 13 move to realize the reversing gear commutation of R of right position puts into gear, then, the first solenoid directional control valve 20 energisings are in right position, the oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, thereby make the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 and rod chamber hydraulic fluid port B in the draining state, make its piston be still in right position simultaneously, after this, the second solenoid directional control valve 21 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the second two-way cylinder 14 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A, while is 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 the hydraulic fluid port A rodless cavity hydraulic fluid port A fuel feeding to 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, the second solenoid directional control valve 21 energisings are in right position, the oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, thereby make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B in the draining state, make its piston be still in right position simultaneously, subsequently, the 9th solenoid directional control valve 35 outages end in left position, oil inlet P, and the hydraulic fluid port A of the control port X that hydraulic fluid port A is communicated with drain tap T, make Parking valve 28 by the 9th solenoid directional control valve 35 and drain tap T draining make its in left position, the oil inlet P cut-off, thereby and the first hydraulic fluid port A be communicated with the 3rd hydraulic fluid port A1, the second hydraulic fluid port B and be communicated with the 4th hydraulic fluid port B1, make the piston of the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 move to the brake off effect of left position simultaneously, moment the 5th solenoid directional control valve 31 outages in the 9th solenoid directional control valve 35 outages end in left position, drain tap T, 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 hydraulic fluid port A to the hydraulic fluid port A fuel feeding of the first unidirectional oil cylinder 24 and realizes the transmission of R1 gear, thus the uphill starting while realizing reversing gear.

During vehicle forward gear uphill starting, manual guiding valve 12 is placed in the D position, oil inlet P is communicated with the second hydraulic fluid port B, the first hydraulic fluid port A is communicated with drain tap T, make hydraulic fluid port B and the first hydraulic fluid port A1 of the control port X of the first guiding valve 17 through shuttle valve 16, oil pipe 202 reverses gear, thereby the first hydraulic fluid port A of manual guiding valve 12 and drain tap T draining make it in left position, hydraulic fluid port A cut-off, and hydraulic fluid port B is communicated with drain tap T, make hydraulic fluid port B and the drain tap T draining of the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 through the first guiding valve 17, the fluid of main fuel feeding oil pipe 201 is handled control slide valve 12 simultaneously oil inlet P and the second hydraulic fluid port B enter forward gear oil pipe 203, when detecting vehicle, transmission electronic control unit (TCU) has while slipping backward slope trend, at first by the hydraulic pressure parking function when forming the P gear, identical control makes car brakeing to prevent from slipping slope, meanwhile the first solenoid directional control valve 20 outages are in left position, hydraulic fluid port T cut-off, 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 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 realizes that the commutation of forward gear D puts into gear, then, the first solenoid directional control valve 20 energisings are in right position, the oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, thereby make the rodless cavity hydraulic fluid port A of the first two-way cylinder 13 and rod chamber hydraulic fluid port B in the draining state, make its piston be still in left position simultaneously, after this, the second solenoid directional control valve 21 outages are in left position, drain tap T cut-off, and oil inlet P is communicated with hydraulic fluid port A, fluid in forward gear oil pipe 203 is the rod chamber hydraulic fluid port B fuel feeding to the second two-way cylinder 14 through the oil inlet P of the second solenoid directional control valve 21 and hydraulic fluid port A, while is 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 the hydraulic fluid port B rodless cavity hydraulic fluid port A fuel feeding to the second two-way cylinder 14, make the piston of the second two-way cylinder 14 move to right position and realize that the gear of forward gear D1 and D5 is preset, then, the second solenoid directional control valve 21 energisings are in right position, the oil inlet P cut-off, and hydraulic fluid port A is communicated with drain tap T, thereby make the rodless cavity hydraulic fluid port A of the second two-way cylinder 14 and rod chamber hydraulic fluid port B in the draining state, make its piston be still in right position simultaneously, subsequently, the 9th solenoid directional control valve 35 outages end in left position, oil inlet P, and the hydraulic fluid port A of the control port X that hydraulic fluid port A is communicated with drain tap T, make Parking valve 28 by the 9th solenoid directional control valve 35 and drain tap T draining make its in left position, the oil inlet P cut-off, thereby and the first hydraulic fluid port A be communicated with the 3rd hydraulic fluid port A1, the second hydraulic fluid port B and be communicated with the 4th hydraulic fluid port B1, make the piston of the 3rd unidirectional oil cylinder 26 and the 4th unidirectional oil cylinder 27 move to the brake off effect of left position simultaneously, moment the 5th solenoid directional control valve 31 outages in the 9th solenoid directional control valve 35 outages end in left position, drain tap T, 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 hydraulic fluid port A to the hydraulic fluid port A fuel feeding of the first unidirectional oil cylinder 24 and realizes the transmission of D1 gear, thus the uphill starting while realizing forward gear.

Claims

1. the hydraulic control system of the speed changer that for parallel planet wheel is, 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, be 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); The guiding valve that 2 of three external control types 3 are logical, be respectively the first guiding valve (17), the second guiding valve (18) and the 3rd guiding valve (19); The Parking valve (28) that 2 of external control types 5 are logical; Two 23 logical interlock valve, be respectively the first interlock valve (29) and the second interlock valve (30); Nine 23 electric change valves, be 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 the first two-way cylinder (13) rodless cavity is being communicated with the hydraulic fluid port B of the first guiding valve (17), the hydraulic fluid port B of rod chamber and is being 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 the first guiding valve (17) is being communicated with the 3rd hydraulic fluid port B that oil groove (11), control port X are being communicated with shuttle valve (16); The first hydraulic fluid port A1 of described shuttle valve (16) is being communicated with an end, the control port X that the second hydraulic fluid port A2 is being communicated with the second guiding valve (18) simultaneously, the control port X of the 3rd guiding valve (19) and the hydraulic fluid port A of the 4th solenoid directional control valve (23) of the oil pipe that reverses gear (202); The oil inlet P of described the first solenoid directional control valve (20) is being communicated with forward gear oil pipe (203), drain tap T is being communicated with oil groove (11); The oil inlet P of described the 4th solenoid directional control valve (23) is being communicated with forward gear oil pipe (203), drain tap T is being communicated with oil groove (11); When simultaneously to its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B fuel feeding, can make its piston move to right the R commutation that realizes reversing gear puts into gear, when to its rodless cavity hydraulic fluid port A draining, simultaneously to its rod chamber hydraulic fluid port B fuel feeding, can make its piston move to left position and realize that forward gear D commutation puts into gear, when simultaneously to its rodless cavity hydraulic fluid port A and rod chamber hydraulic fluid port B draining, can make its piston be still in present position;

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

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

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

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

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

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

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