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

GF27.60-P-2002N Transmission Control, Function
TRANSMISSION 722.9 in MODEL 215, 220
TRANSMISSION 722.9 in MODEL 171.4, 203, 230 (except 171.473 /44)
- except CODE (428) Steering wheel shift buttons
up to Model Year 2008
TRANSMISSION 722.9 in MODEL 463.303 /340 /341 up to 31.5.12
TRANSMISSION 722.9 in MODEL 209, 211, 219
- except CODE (428) Steering wheel shift buttons

The transmission control is dived into electronic and hydraulic transmission control.
Whilst the electronic transmission control takes over the gear selection and adaptation of pressures to the torque to be transmitted, the power supply of the transmission is controlled via the hydraulic elements of the electrohydraulic 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 fully integrated transmission control (VGS) makes possible precise adaptation of pressures to the respective operating conditions and to the engine output during the shift phase which results in a significant increase in shift quality.

It is possible to reach the engine rpm limit in the individual gears using full throttle and kickdown.
The shift range can be changed in the forwards gears while driving, however the fully integrated transmission control (VGS) prevents an unacceptably high engine speed by means of a downshift lockout device The VGS also offers an additional advantage of flexible adaptation to different vehicle and engine variants. The driver can choose between the two transmission modes "S" (sport program) and "C" (comfort program). These also provide different gear ratios for reverse gear.

The fully integrated transmission control (VGS) control unit (Y3/8n4) monitors and shifts depending on:
^ The vehicle speed
^ The position of the selector lever
^ Accelerator pedal position
^ Program selection (C/S)
^ The state of the transmission
^ Signals on the Controller Area Network bus class C (engine compartment) (CAN-C)