ME engine torque requests, function - GF07.61-P-4013MIG
ENGINE 272.945 in MODEL 251.054/154 as of Model Year 2009/AEJ 08
ENGINE 272.967 in MODEL 164.186 as of Model Year 2009/AEJ 08 MOPF
ENGINE 272.967 in MODEL 251.056/065/156/165 as of Model Year 2009/AEJ 08
ENGINE 273.923 in MODEL 164.871 as of Model Year 2009/AEJ 08
ENGINE 273.963 in MODEL 164.172 as of Model Year 2009/AEJ 08 MOPF
ENGINE 273.963 in MODEL 164.886, 251.072/172 as of Model Year 2009/AEJ 08
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.
| Electrical function schematic for engine torque requirements | Model 164 | PE07.61-P-2783-97MAA | ||
| Model 251 | PE07.61-P-2783-97RAA | |||
| ME-SFI [ME] control unit, component description | N3/10 | Engine 272 | GF07.61-P-6000MIG | |
| N3/10 | Engine 273 | GF07.61-P-6000MLG | ||