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

GF27.60-P-2002RMZ Transmission control, function
- Transmission 722.6 [model 209.376 as of 1.6.03, models 211.076/230.474 as of 1.9.03]


The transmission control is dived into electronic and hydraulic transmission control.

While the electronic transmission control (EGS) takes over the gear selection and the adaptation of the pressures to the torque to be transmitted, the power supply of the transmission is controlled via the hydraulic elements of the electro-hydraulic control 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 electronic transmission control offers the advantage of 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

Electronic transmission control takes place depending on the following factors:
^ The vehicle speed
^ The position of the selector lever
^ Accelerator pedal position
^ Program selection ("M", "C", "S")
^ Programmed shift range (with program selection "C", "S")
^ Selected gear (with program selection "M")
^ The state of the transmission
^ Controller Area Network (data bus/CAN bus) (CAN) signals