GF07.10-P-1013MMI Torque Coordination, Function

GF07.10-P-1013MMI Torque Coordination, Function
ENGINES 152.9 in MODEL 172.4

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

Torque coordination, general
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 request is to be met.

The following systems can make an engine torque request:

- The driver, through the accelerator pedal sensor (B37)
- Electronic Stability Program, via the chassis CAN (CAN E) from the Electronic Stability Program control unit (N30/4)
- CC, over the Electronic Stability Program control unit (except code (233) DISTRONIC PLUS)
- Transmission control, from the fully integrated transmission control unit (Y3/8n4) via the drive train CAN (CAN C)
- DISTRONIC PLUS, from the radar sensors control unit (N62/1) (for code (233) DISTRONIC PLUS), for code (237) Active Blind Spot Assist) via the chassis CAN
- Maximum engine speed limitation
- Maximum vehicle speed limit
- Maximum torque limitation
- Overheating protection

The ME-SFI [ME] control unit reads in the following sensors and signals for torque coordination:

- Coolant temperature sensor (B11/4)
- Intake air temperature sensor (B17)
- Crankshaft Hall sensor (B70)

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

- Extending or shortening the injection time of the fuel injectors (Y76)
- 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.