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

GF07.61-P-4013MAR ME Engine Torque Requests, Function
- refinement package
- 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 can set an engine torque requirement:
- Driver, through the accelerator pedal sensor (B37)
- Transmission control, through the electric controller unit (fully integrated transmission control) (Y3/8)
- ESP, through the ESP, SPS [PML] and BAS control unit (N47-5)
- Cruise control or Distronic (if Distronic present), through ESP, SPS [PML] and BAS control unit
- Maximum torque limitation
- Maximum engine speed limitation
- Maximum vehicle speed limit

Engine torque requests function sequence
According to the dynamic requirements, the ME-SFI control unit varies the engine torque requirement, by:
- Lengthening/shortening the injection time of the fuel injection valves (Y62)
- Adjusting the ignition angles of the ignition coils (T1) to advance or retard (this allows very rapid adjustment 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.