ME engine torque requests function - GF07.61-P-4013MIS
ENGINE 272.9 (except 272.974) in MODEL 221.0 /1 (except 221.095 /195) as of model year 2009 /AEJ 08
ENGINE 273.9 in MODEL 216.3, 221.0 /1 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 [ME] control unit (N3/10) coordinates and sets priorities for the requirements of all systems (according to driveability 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.
| Electrical function schematic for engine torque requirements | Model 216 | PE07.61-P-2783-97CAB | |
| Model 221 | PE07.61-P-2783-97SAB | ||
| Component description for ME-SFI [ME] control unit | N3/10 Engine 272 |
GF07.61-P-6000MIS | |
| N3/10 Engine 273 |
GF07.61-P-6000MLS |