ME engine torque requests, function - GF07.61-P-4013MAS

ENGINE 156.984 in MODEL 216.377, 221.077 /177 as of Model Year 09 /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 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 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

Engine torque requests function sequence 

According to the dynamic requirements, the ME-SFI control unit varies the engine torque requirement, by:

• Lengthening or shortening the injection time of the fuel injection valves (Y62) (therefore also increasing or reducing the opening angles of the throttle valves)
• 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-2783-97CAC
		Model 221	PE07.61-P-2783-97SAC
	ME-SFI [ME] control unit, component description	N3/10	GF07.61-P-6000MAS