Mixture Formation -- Basic Knowledge -- 251 Chassis: Specifications Mercedes-Benz R-class W251 facelift

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

1. Circuit 87M ON (engine control ON)
2. 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 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

1. Driver, through the accelerator pedal sensor (B37)
2. Transmission control, through the electric controller unit (VGS) (Y3/8)
3. Electronic Stability Program (ESP), through the ESP control unit (N47-5)
4. Cruise control or Distronic (if Distronic present), through the ESP control unit
5. Maximum torque limitation
6. Maximum engine speed limitation
7. Maximum vehicle speed limit

Engine torque requests function sequence

According to the requirement dynamics, the ME-SFI control unit varies the engine torque by

1. Lengthening or shortening the injection time of the injection valves (Y62)
2. Advance or retard adjustment of the ignition angle of the ignition coils (T1) (this allows very rapid variation of the engine torque)
3. 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

ME engine torque requirements function - GF07.61-P-4015V

ENGINE 272.920 in MODEL 203 up to Model Year 8

ENGINE 272.922 in MODEL 211

ENGINE 272.940 in MODEL 203 up to Model Year 8

ENGINE 272.941 in MODEL 203 up to Model Year 8

ENGINE 272.942 in MODEL 171 up to Model Year 8

ENGINE 272.943 in MODEL 211, 219

ENGINE 272.944 in MODEL 211

ENGINE 272.945 in MODEL 251 up to Model Year 8

ENGINE 272.946 in MODEL 221 up to Model Year 8

ENGINE 272.960 in MODEL 203 up to Model Year 8

ENGINE 272.963 in MODEL 171 up to Model Year 8

ENGINE 272.964 in MODEL 211, 219

ENGINE 272.965 in MODEL 221 up to Model Year 8

ENGINE 272.966 in MODEL 230 up to Model Year 8

ENGINE 272.967 in MODEL 164, 251 up to Model Year 8

ENGINE 272.970 in MODEL 203 up to Model Year 8

ENGINE 272.972 in MODEL 211

ENGINE 272.975 in MODEL 221 up to Model Year 8

ENGINE 273.922 in MODEL 221 up to Model Year 8

ENGINE 273.923 in MODEL 164 up to Model Year 8

ENGINE 273.924 in MODEL 221 up to Model Year 8

ENGINE 273.960 in MODEL 211, 219

ENGINE 273.961 in MODEL 216, 221 up to Model Year 8

ENGINE 273.962 in MODEL 211

ENGINE 273.963 in MODEL 164, 251 up to Model Year 8

ENGINE 273.965 in MODEL 230 up to Model Year 8

ENGINE 273.967 in MODEL 209

ENGINE 273.968 in MODEL 221 up to Model Year 8

ENGINE 272.940 in MODEL 209

ENGINE 272.960 in MODEL 209

Shown on engine 272.963 in model 171

Scheme 86

The function (torque interface) coordinates and prioritizes the requirements of all vehicle systems requiring torque. At the same time, the dynamics of the conversion for each requirement are established.

The engine torque is modified as follows

1. Increase or reduction of injected volume
2. Early or late adjustment of the ignition angle (rapid)
3. Combination of both options If the injected volume is increased and the ignition angle simultaneously adjusted to "late", the engine torque first stays the same, but the option is available to rapidly achieve a subsequent torque increase by early adjustment of the ignition angle (torque reserve).

The following functions can require an engine torque

1. Driver preset
2. Transmission control/protection
3. ESP
4. Cruise control/Distronic
5. Torque limitation, e.g. during startup
6. Limitation of engine speed and max. speed
7. Ancillary assemblies (coolant compressor, generator, power steering pump)
8. Functions such as idle speed control and deceleration fuel shutoff.