Transmission Control

Function
The transmission control is divided into the electronic and hydraulic transmission control functions.

While the electronic transmission control is responsible for gear selection and for matching the pressures to the torque to be transmitted, the transmission's power supply control occurs via hydraulic elements in the electrohydraulic control module. The oil supply to the hydraulic elements, such as the hydrodynamic torque converter, the shift elements and the hydraulic transmission control, is provided byway of an oil pump connected with the torque converter.

The electronic transmission control (ETC) allows for the precise adaptation of pressures to the corresponding operating conditions and to the engine output during the gearshift phase, resulting in a noticeable improvement in shift quality.

The engine speed limit can be reached in the individual gears at full throttle and kickdown. The shift range can be changed in the forward gears while driving, but the electronic transmission control (ETC) employs a downshift safeguard to prevent over-revving the engine.

The system offers the additional advantage of flexible adaptation to different vehicle and engine variants.

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