GF07.61-P-4013MIG ME Engine Torque Requests, Function

GF07.61-P-4013MIG ME Engine Torque Requests, Function
- as of model year 09


Function requirements for engine torque requests, general points
^ Circuit 87M ON (engine control ON)
^ Engine running

Engine torque requests, general points
The torque interface in the ME-SFI control unit (N3/10) coordinates and sets priorities for the requirements of all systems (according to drivability and priority setting), which determine engine torque requirement.
It also determines how dynamically each requirement is to be implemented.

The following systems can make an engine torque request:
- Driver, through the accelerator pedal sensor (B37)
- Transmission control, through the electric controller unit (VGS) (Y3/8)
- Electronic Stability Program (ESP), through the ESP control unit (N47-5)
- Cruise control or Distronic (if Distronic present), through the ESP control unit
- Maximum torque limitation
- Maximum engine speed limitation
- Maximum vehicle speed limit

Engine torque requests function sequence
According to the requirement dynamics, the ME-SFI control unit varies the engine torque by:
- Lengthening or shortening the injection time of the injection valves (Y62)
- Advance or retard adjustment of the ignition angle of the ignition coils (T1) (this allows very rapid variation of the engine torque)
- Combined adaptation of injection time and ignition angle

Torque reserve
If the injection time is increased and the ignition angle is retarded at the same time, the engine torque remains the same at first. However, the engine torque can then be raised very quickly by advancing the ignition angle.