ME-SFI engine torque requests function - GF07.61-P-4013G

ENGINE 273 in MODEL 463.202/222/236/237 up to 31.5.12 as of model year 2009/YoM 08

Fig 1: Identifying ME-SFI Engine Torque Requests Function Chart

Courtesy of MERCEDES-BENZ USA

Function requirements for engine torque requests for the ME-SFI gasoline injection and ignition system (engine electronic) (ME), general points

Circuit 87M ON (engine control ON)
Engine running

ME-SFI engine torque requests, general points

The torque interface in the ME-SFI [ME] control unit 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, via the accelerator pedal sensor
Transmission control, from the electric controller unit (VGS)
Electronic-Stability-Program (ESP), via the ESP control unit
Cruise control, from the ESP control unit
Maximum torque limitation
Maximum engine speed limitation
Maximum vehicle speed limit

ME-SFI engine torque requests, function sequence

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 (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.

Component description for ME-SFI [ME] control unit	N3/10	GF07.61-P-6000G
Component description for ESP control unit,	N30/4	GF42.45-P-5118G
Component description for fully integrated transmission control unit	Y3/8n4	GF27.60-P-5165GGA