Chery SQR 7160 sedan. Manual — part 116

CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

174

scope of 1

st

gear.

The lock valve also prevents the manual downshift from 2

nd

to 1

st

gear when it is beyond the scope

of 1

st

gear by controlling the pressure in brake C’s oil circuit.

11. 2

nd

gear lock valve

When the control handle is in position 2, the lock valve controls the linear oil pressure at 2

nd

-3

rd

shift valve and prevents it from upshift to 3

rd

gear. Hence, the vehicle speed is limited within the

scope of 2

nd

gear.

The lock valve also prevents the manual downshift from 3

rd

to 2

nd

gear when it is beyond the scope

of 2

nd

gear by controlling the pressure in brake C’s oil circuit.

12. 2

nd

-3

rd

-4

th

upshift valve

2

nd

-3

rd

–4

th

upshift valve ensures that the transmission has upshift in the order of 2

nd

–3

rd

–4

th

gear.

When the planetary mechanism engages at 3

rd

gear drive ratio, the upshift valve releases the oil

pressure given by governor on 3

rd

-4

th

shift valve. Since the transmission could not jump directly

from clutch A to brake C for engagement, the direct upshift from 2

nd

to 4

th

gear is also impossible.

13. 4

th

-3

rd

-2

nd

downshift valve

4

th

-3

rd

-2

nd

downshift valve ensures that the transmission has downshifts in the order of 4

th

–3

rd

–2

nd

gear. The downshift valve controls the pressure on 2

nd

-3

rd

shift valve’s oil circuit and maintains it at

position 3 until the planetary gear engages at 3

rd

gear. Since the transmission could not jump

directly from clutch A to brake C for engagement, the direct downshift from 4

th

to 2

nd

gear is also

impossible.

14. 3

rd

-4

th

traction valve

3

rd

–4

th

traction valve controls the brake A’s oil pressure at 4

th

gear. When 3

rd

-4

th

upshift valve

works, clutch A drains the oil through the traction valve. Only when brake C could transfer the

engine’s output torque, the traction valve drains the oil.

15. 4

th

-3

rd

traction valve

4

th

–3

rd

traction valve works as the oil feed valve on clutch A’s shuttle valve. When 4

th

-3

rd

downshift valve works, it fills the hydraulic fluid required by clutch A in advance.

16. 4

th

–3

rd

downshift valve

4

th

–3

rd

downshift valve works as the oil pressure maintaining valve for brake C until clutch A is

full of oil. Brake C also drains the oil through 4

th

–3

rd

downshift valve.

17. Time control valve

During transition between clutches, the time control valve controls the delay time for the clutch’s

engagement and disengagement. The delay time is same with the shuttle valve’s buffer time and

irrelevant with 4

th

-3

rd

traction valve and 4

th

-3

rd

downshift valve.

18. Throttle control valve

The throttle control valve is on the power transfer oil circuit and controls the oil pressure on time

control valve and brake C by controlling the time of oil feed.

CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

175

Centrifugal governor

The centrifugal governor is installed on and rotates along with the driven shaft. The governor is

used to produce the oil pressure on the governor to provide an oil pressure varying with the vehicle

speed for the control system.

Three-level governor

Condition I.

The oil pressure provided by the main oil circuit from position 3-2 valve to position 1 valve does

not change. The valve rotates together with the driven shaft. The slide valve and centrifugal block

moves outwards under the centrifugal force and opens the oil inlet. Thus, the pressure of the main

oil circuit comes into the governor to cause oil pressure on the governor. Meanwhile, the governor’s

oil pressure acts on the slide valve and closes the oil inlet somewhat until the oil pressure of the

governor is balanced with the centrifugal force on the slide valve.

Condition II.

Since the centrifugal block integrated with the slide valve in the governor has a greater mass and

centrifugal force and along with an increased vehicle speed, the oil pressure on the governor that is

balanced with the centrifugal force is also increased dramatically until the centrifugal block stops to

move outwards.

Condition III.

When the centrifugal block stops to move outwards, the slide valve could not move outwards under

its own centrifugal force. Due to the slide valve’s small mass, its centrifugal force increases slowly

along the RPM changes. Hence, the oil pressure of the governor that is balanced with it also

changes little.

The governor’s oil pressure changes along with the vehicle speed’s changes so that
the oil pressure on oil circuit in each control element also changes. Then automatic
shift is realized by the throttle oil pressure.

Content

Part 1 Motorola Multi-port electric fuel injection motor system

1、system description. . . . . . . . . . . 1

2、operation. . . . . . . . . . . . …2

3、fuel injection system using and servicing. . . . . . …10

4、fuel injection system fault and repairing. . . . . . …12

5、ECU circuit. . . . . . . . . . . …17

6、engine circuit. . . . . . . . . . . . 18

7、electric injection theory diagram. . . . . . . . …19

8、ECU pin definition. . . . . . . . . . . 21

Part 2 M&M Multi-port electric injection engine systems

1、system description. . . . . . . . . . . 23

2、operation. . . . . . . . . . . . . 23

3、fuel injection system control strategy. . . . . . . …24

4、structure. . . . . . . . . . . . . 25

5、electric fuel injection system service. . . . . . . …34

6、electric fuel injection system fault and trouble shooting. . . . 36

Appendix 1. ECU wiring diagram and pin definition. . . . …38

Appendix 2. electrical component character parameter. . . . …40

Preface

MOT and M&M multi-port motors are applied in CHERY cars, and the detailed

matching and establishment rules are as follows

Electric

injection type

Motor model

No.

Gear

box

type

Ex factory No.

MOT SQR480EB

MT

“SQR480EB*EB××

×××××”

MOT SQR480EC

AT

“SQR480EC*EC××

×××××”

M&M SQR480ED

MT

“SQR480ED*ED××

×××××”

Note: due to the difference between MOT and M&M systems, every maintenance point

should pay attention to the difference when repair them.