GF27.60-P-2002PMA Transmission Control, Function

GF27.60-P-2002PMA Transmission control, function
- Transmission 722.6
- with CODE (428) Steering wheel shift buttons


Transmission control is divided into the functions of electronic transmission control (ETC) and hydraulic transmission control. Whilst the EGS takes over the gear selection and adaptation of pressures to the torque to be transmitted, the power supply control of transmission 722.6 takes place via the hydraulic elements of the electrohydraulic controller unit. The oil supply to the hydraulic elements, such as the hydrodynamic torque converter, the shift elements and the hydraulic transmission control, is provided by way of an oil pump connected to the torque converter. The electronic transmission control (ETC) makes possible a precise adaptation of pressures to the respective operating conditions and to the engine output during the gearshift phase, resulting in a significant improvement in shift quality.

The ETC offers the advantage of a flexible adaptation to various vehicle and engine versions.

The driver can choose between 3 transmission modes "S" (sport program), "C" (comfort program) and "M" (manual program). These also provide different gear ratios for reverse gear.

The engine speed limit can be reached in the individual gears at full throttle and kick down. The shift range can be changed in the forwards gears while driving, however the ETC prevents an unacceptably high engine speed by means of a downshift lockout device

The ETC takes place as a function of:
^ Vehicle speed
^ The position of the selector lever
^ Accelerator pedal position
^ Program selection ("M/C/S")
^ Programmed shift range
^ Selected gear (with program selection "M")
^ Condition of transmission
^ Controller Area Network (CAN) signals