6th speed power transmission path (transmission ratio: 0.676:1) 

锁止离合器

变矩器

内齿圈

行星轮

输出到车轮

输入

输出到车轮

太阳轮

变矩器

TC

C2

C3

C1

B1

B2

OWC

1-2

OWC

后太阳轮

长行星轮

短行星轮

前太阳轮

内齿圈

传动齿轮

从动齿轮

输出轴

SL03-0013c

 

Reverse gear power transmission path (transmission ratio: 3.178:1) 

锁止离合器

变矩器

内齿圈

行星轮

输出到车轮

输入

输出到车轮

太阳轮

变矩器

TC

C2

C3

C1

B1

B2

OWC

1-2

OWC

后太阳轮

长行星轮

短行星轮

前太阳轮

内齿圈

传动齿轮

从动齿轮

输出轴

SL03-0014c

 

Lock clutch of 

torque converter 

Torque 

converter 

Input 

Inner gear ring 

Planet gear 

Sun gear 

Drive gear

Inner gear 

ring

Long planet gear

Rear sun 

gear

Short planet 

gear

Front sun 

gear

Outputto wheel 

Driven gear

Output shaft

Outputto wheel

Lock clutch of 

torque converter 

Torque 

converter 

Input 

Inner gear ring 

Planet gear 

Sun gear 

Drive gear

Inner gear 

ring

Long planet gear

Rear sun 

gear

Short planet 

gear

Front sun 

gear

Outputto wheel 

Driven gear

Output shaft

Outputto wheel

1259

 
 

 

Parking/neutral power transmission route 

锁止离合器

变矩器

内齿圈

行星轮

输出到车轮

输入

输出到车轮

太阳轮

变矩器

TC

C2

C3

C1

B1

B2

OWC

1-2

OWC

后太阳轮

长行星轮

短行星轮

前太阳轮

内齿圈

传动齿轮

从动齿轮

输出轴

SL03-0015c

 

3.5.3.3 Shift mode 

Command mode 

The common mode is that the control level is located in gear D and the transmission is in the range of 
conventional temperature. In this mode, the shift curve more tends to better economy to meet the conventional 
way of driving. 

Uphill and downhill mode 

This mode is determined according to the load of the vehicle; in this mode, the transmission control unit (TCU) 
can automatically select different shift intervals to gradually adjust the shift points and the torque converter 
locking point. 

High altitude mode 

Due to effect of the atmospheric pressure and the temperature change at high altitude, the torque generated by the 
engine will be reduced; thus, the shifting point at the high altitude will be automatically be regulated to amend the 
change caused by torque reduction of the engine. 

Trip stop mode: 

The transmission supports direct shift between 2nd speed    positions or 3 gear positions, for example from 5th 
speed    to 3rd speed , 6th speed to 4st speed or 2nd speed    to 4st speed    to optimize the enginrer RPM. 

Warming-up mode 

It is usually used when the transmission oil temperature is lower than 20 .

℃

 

The hydraulic torque converter is not locked when the transmission oil temperature is below 20  to accelerate 

℃

the transmission warm. 

High temperature mode 

The high temperature mode is applied in the transmission at the oil temperature between 110  and 145 . The 

℃

℃

hydraulic torque converter locking range is increased in order to avoid from producing excessive heat by adding 
the hydraulic torque converter. 

Lock clutch of 

torque converter 

Torque 

converter 

Input 

Inner gear ring 

Planet gear 

Sun gear 

Drive gear

Inner gear 

ring

Long planet gear

Rear sun 

gear

Short planet 

gear

Front sun 

gear

Outputto wheel 

Driven gear

Output shaft

Outputto wheel

1260

 
 

Other components that improve the high temperature of the transmission oil will be activated: 

• 

If it is higher than 110  

℃

- radiator fan will be open. 

• 

If exceeding 130  

℃

- engine torque will decrease. 

• 

If it is higher than 145  

℃

- transmission will stop working until the transmission oil temperature is lower than 

120 , so as to create protection.

℃

 

In case the high temperature mode is activated, the other performances of the transmission will be inhibited, 
including the amendment of the uphill and downhill modes and high altitude mode. The hydraulic torque 
converter is locked during shifting, which may drop the shifting feeling. The high temperature mode can be exited 
only when the transmission oil temperature is lower than 105 .

℃

 

Cruise mode 

If the cruise mode is activated, the engine ECU requires transmission downshift; and at this time, the accelerator 
pedal is in automatic constant to improve the engine brake. 

3.5.3.4 Control system element of transmission 

Transmission control unit (TCU) 

The transmission control unit (TCU) and its I/O bus control the following operations: 

z  Gear control 

z  Oil pressure control 

z  Clutch pressure control 

z  Control of hydraulic torque converter lock clutch   

In addition, the transmission control unit (TCU) determines the transmission operation strategies by receiving the 
relevant sensor signals and input switching signals. 

The transmission control unit (TCU) can decide whether the vehicle meets the shift criteria or the working 
conditions for the hydraulic torque converter clutch according to these input signals. Meanwhile, the transmission 
control unit (TCU) can calculate the working pressure required to regulate the shift quality. The transmission 
control unit (TCU) controls the gear shifting actions through 6 variable pressure electromagnetic valves and 4 
switching electromagnetic valves. 

Note: if the transmission control unit (TCU) needs to refresh, the hand brake must be pulled up to put the 
transmission gear into the gear P. The refreshing step of the automatic transmission refers to 3.5.7.4 Automatic 
Transmission Refreshing Procedure. 

Embedded memory module 

Embedded memory module (EMM) is matched with the transmission valve body in the manufacture process. 

The EMM is integrated on input shaft speed sensor installed on the transmission valve body. 

EMM data contains specific characteristic information of the transmission. Upon completion of installation, the 
transmission control unit will upload data from EMM and use such data when the transmission is in operation. 

Electromagnetic valve and variable pressure electromagnetic valve 

The valve body comprises four opening/closing electromagnetic valves and six variable pressure electromagnetic 
valves. On/off electromagnetic valve can be controlled to realize the change between two positions: on and off; 
these valves are used for changing the flow and on/off of the hydraulic system. The variable pressure 
electromagnetic valve converts the current into the hydraulic pressure in the same proportion. 

Speed sensor 

The input shaft speed sensor and the output shaft speed sensor are integrated, and both of them are Hall sensors. 
The sensor is installed in the transmission and located below the valve body. 

Transmission oil temperature sensor. 

1261

 
 

The transmission oil temperature sensor is located on the valve body harness. The transmission control unit (TCU) 
activates different shifting strategies according to the input from the transmission oil temperature sensor. The 
sensor consists of a temperature sensor. 

The temperature sensor checks the reasonability of the reading. If the input signal from the temperature sensor is 
outside the normal operating range, it may be caused by sensor short circuit or open circuit. 

Gear switch 

The transmission control unit (TCU) determines the position of the shift lever through the position in which the 
gear switch is. 

The gear switch is connected with the flexible gear shifting shaft, the selector controls the gear switch to switch 
the gear positions in the transmission among P, R, N and D. 

For manual mode, the gear switch detects (+ or -) of the driver within manual selection scope and sends the signal 
detected to the transmission control unit (TCU). 

Note: if the gear switch is no in gear P or gear N, or the gear switch is disconnected, the engine is unable to 
start. 

 

1262