Adaptive Transmission Control

Adaptive Transmission Control

As in the previous automatic transmissions, there are different adaptation modes for the A-program (automatic - in selector lever position D) in the 6-speed automatic transmission.

Adaptive transmission control provides the following features:

- Shift points and shift pressures based on driver type
- Maintains shift quality over the lifetime of the transmission through adaptive pressure control
- Torque converter lock up clutch.

In the A-program, only the basic shift characteristic map XE (extreme economy) and the performance-oriented shift characteristic map E (economy) are selected. The A-program offers the driver comfortable gearshift characteristics with very smooth gear changes.

The control module simultaneously monitors engine speed, turbine (input) speed and output speed. This is necessary to determine the slip ratio and slip time during a shift. Slip ratio and slip time are influenced by production differences between transmissions and normal wear.

The control module performs the adaptive pressure control function by modifying the control of the EDS valves increasing the clutch apply pressures to compensate for internal slip. The adaptive pressure control function optimizes the shift quality and increases the life span of the clutch plates.

Pressure adaptation takes place automatically while driving. After performing repairs on the transmission, it is necessary to reset the pressure adaptation with the DISplus. A test drive should then be performed ensuring that the transmission is driven in all gears.