Transmission control, function - GF27.60-P-2002NL

TRANSMISSION 722.9 in MODEL 171.4, 203, 209, 211, 219, 230 with CODE (428) Steering wheel shift buttons 

TRANSMISSION 722.9 in MODEL 171.473 

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

While 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 3 transmission modes "S" (sport program), "C" (comfort program) and "M" (manual 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 (M/C/S)
• The state of the transmission
• The selected gear (with program selection "M")
• Signals on the Controller Area Network bus class C (engine compartment) (CAN-C)

  	VGS control unit, location/task		GF27.19-P-4013N
  	Electric control unit, location/task/design/ function		GF27.19-P-5104N
  	Kick-down simulator, location/task		GF27.10-P-5108N
  	Selection range sensor, location/task		GF27.19-P-5142N
  	Transmission oil temperature sensor, location/ task/design		GF27.19-P-4014N
  	Location/task/function of RPM sensor		GF27.19-P-5127N
  	Oil pump, location/task/design/function		GF27.10-P-5103N