GF07.61-P-4013MIS ME Engine Torque Requests Function

GF07.61-P-4013MIS 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 [ME] 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, from the electric controller unit (VGS) (Y3/8)
- Electronic Stability Program (ESP), through the ESP control unit (N47-5)
- Cruise control, from the ESP control unit
- Distronic PLUS, through the radar sensors control unit (SGR) (N62/1) (if Distronic PLUS is installed)
- Maximum torque limitation
- Maximum engine speed limitation
- Maximum vehicle speed limit

Function sequence for engine torque requests
According to the dynamic requirements, the ME-SFI [ME] control unit varies the engine torque requirement, 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.