Chery A11. Manual — part 106

CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

2. Position 1 1

st

gear’s power transfer route

Brake D is also engaged. The planetary rack is locked by brake D. The engine’s brake is

realized by its idle rotation resistance.

3. 2

nd

gear’s power transfer route

Clutch A is engaged. The engine’s power is connected with rear sun gear through the torque

converter worm gear, worm and sun gear shaft. The front sun gear is locked by brake C and

C-shape brake band. 2

nd

gear one-way overrun clutch is in working status. The short planetary

gear brings along the long planetary gear, which rotates around the fixed front sun gear. Thus,

the engine’s power is transferred to the gear ring and output shaft.

4. 3

rd

gear’s power transfer route

About 41% of the engine’s power is torque transferred.

Clutch A is engaged. The engine’s power is connected with rear sun gear through the torque

orm and sun gear shaft.

About 59% of the engine’s power is mechanically transferred.

The rear sun gear and planetary rack rotate together. The planetary gear mechanism’s drive

ratio is 1:1. The output shaft is driven by the gear ring.

oute

the front long sun gear. The long

planetary gear rotates around front sun gear and brings along the output shaft through the gear

ring.

6. Back gear’s power transfer route

Clutch A engages. The worm is connected with the front sun gear through the brake drum.

Clutch D engages and the planetary rack is locked. Thus, the long planetary gear rotates

oppositely between the front sun gear and the gear ring to bring along the counterclockwise

ut shaft.

Parking brake

r could prevent the pawl’s error action. The vehicle is normally locked even under

aged.

converter worm gear, w

5. 4

th

gear’s power transfer r

Clutch A engages. The engine’s power comes directly from the input shaft to the planetary

rack. The brake band locks the braking drum so to lock

rotation of the outp

The parking brake only works when the control handle is in position P. The brake prevents the

vehicle’s rolling by mechanical method.

The parking brake pawl engages with the parking interlock gear. The interlock gear is again linked

with the driven shaft so to lock the vehicle’s drive gear.

When the control handle is in position P, the setup spring could ensure that brake pawl brakes the

terlock gear at the very moment that the vehicle rolls.

in

The lock stabbe

great traction. The pawl slips on the parking gear at high-speed and only works normally at

low-speed.

Pull the handle to position P only when the vehicle has been stopped completely. Otherwise, the

braking pawl may be dam

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CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

Hydraulic control system

The hydraulic control system controls under following conditions:

1. The control handle’s position or main oil circuit’s pressure;

2. Accelerator pedal’s position or throttle oil pressure;

3. Vehicle speed or regulator oil pressure;

1. Shift

valve

The shift valve controls the hydraulic liquid’s flow circuit in accordance with the control

handle’s position. The hydraulic oil arrives at the clutch and brake through the shift valve and

brake valve from the main oil circuit.

2. Oil pressure control valve (drain valve)

The oil pressure control valve opens when the oil pressure rises to certain value and the hydraulic

fluid flows back the oil pump’s suction chamber. The drain valve is different from relief valve

and is related with the regulator.

The hydraulic system on the main oil pressure control valve plate assembly has its oil pressure

on regulator, throttle, governor and torque converter all supplied by the main oil pressure.

3. Lubrication valve

verter relief valve

The torque converter’s relief valve limits the oil pressure inside the converter.

5. Governor

The governor simulates the engine’s output torque and controls the oil circuit pressure in the shift

elements at each gear. When gear shifted, the governor’s oil pressure is also adjusted accordingly.

When the engine’s output torque is low, the oil pressure inside the control element’s closed oil

circuit is also low;

When the engine’s output torque is high, the oil pressure inside the closed oil circuit is also high.

Since the engine’s rotation speed is low, the engine’s output torque is quite high, the governor must

Step down the accelerator pedal and the governor adjusts the throttle valve’s oil pressure.

2

nd

condition

When it is not necessary to increase the oil pressure, the regulator could work as a relief valve in

order to main continuous and stable oil pressure. The setup spring in the governor decides the oil

pressure. This condition only occurs when the governor’s plug arrives at the end point.

3

rd

condition

Step down the throttle pedal to full at a suitable ignition position and the governor’s oil pressure

could be reduced.

The hydraulic fluid enters into the transmission through the lubrication valve from the torque

converter.

4. Torque con

increase the oil pressure in the oil circuits of different control elements.

The governor works under three conditions:

1

st

condition

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CHERY AUTOMOBILE CO., LTD Automatic Transmission Fault Diagnosis Manual

173

6. Throttle pressure regulator

The throttle pressure regulator is a relief valve and adjusts the oil pressure in the throttle oil circuit

when the throttle valve is at different positions.

Idle position

The accelerator pedal is in free condition. The throttle valve’s piston is at the start point and the

throttle valve doesn’t have any oil pressure.

Parking position

Step down the accelerator pedal a little bit. The throttle valve’s piston moves from the start point to

position 1 and adjusts the oil pressure in the throttle valve during this process.

WOT position

Step down the accelerator pedal and the throttle cam moves to kickdown position. The throttle

valve works at position 1 and the piston moves until position 2. The throttle valve’s oil pressure is

regulated during this process.

Kickdown position

Step down the accelerator pedal to full and the throttle cam moves beyond the kickdown position.

The throttle valve works at position 2.

7. Gearshift

valve

Each gear position has a gearshift valve.

The gearshift control element controls the oil circuit so to control which shift valve is working. The

shift valve closes or opens the valve chamber in accordance with the oil pressure control valve

spindle’s moving. The time when the shift moves from position 1 to 2 is related with the linear,

governor and throttle oil pressure.

8. Shuttle

valve

The shuttle valve protects the control element from impact when the oil pressure changes

dramatically to ensure smooth gearshift and prevent shift impact.

9. Shuttle valve and clutch control valve

The position of accelerator pedal or action of the engine output torque control shuttle valve depends

on the pressure regulator valve for oil pressure output. Each clutch control valve works as a relief

valve to control the oil pressure required by the clutch at gearshift.

10. Oil capacity shuttle valves

These shuttle valves are irrelevant with oil capacity and the oil pressure is not controlled by the

main pressure regulator valve. They depend completely on the spring for buffer.

1

st

and back gear lock valve

1

st

and back gear lock valves has two functions:

1. Prevent the engagement of back gear when the vehicle speed has not been lowered down, close

clutch B and brake D’s control oil circuit; this function is realized through the governor and

linear oil pressure.

2. When the control handle is in position 1, the lock valve controls the linear oil pressure at 1

st

-2

nd

shift valve and prevent it from upshift to 2

nd

gear. Hence, the vehicle speed is limited within the

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.