Torque coordination, function

S07.10-0010-79

Function requirements for torque coordination, general points

 Circuit 87 ON (engine management ON)

 Engine running.

Torque coordination, general

The ME-SFI control unit coordinates the requests from all systems that issue a torque request. It also determines how dynamically each request is to be implemented.

Sources of a torque request:

 Driver, via the accelerator pedal module

 Cruise control (with CODE MS1 (Cruise control))

 Electronic Stability Program (ESP®)

 Rpm limitation

 Maximum vehicle speed limit

 Torque limitation

Function sequence for torque coordination

The ME-SFI [ME] control unit varies the engine torque requirement according to the dynamic requirements by:

 Extending or shortening the injection duration of the fuel injectors

 Advancing or retarding the ignition angle of the ignition coils

 Combined adaptation of the injection and change of the timing

A torque reserve is achieved by simultaneously extending the injection duration and changing the timing to "late". This will enrich the fuel-air mixture, while at the same time preventing a premature torque increase due to the retarding of the timing.

Subsequently, the torque is increased as required by advancing the timing. This enables a fast and comfortable increase in torque.