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

Engine 276.8 in model 172.4 

Function requirements for torque coordination, general points 

• Circuit 87M (Engine management ON)
• Engine runs

Torque coordination, general 

The torque interface in the ME-SFI [ME] control unit (N3/10) coordinates and prioritizes (according to driveability and determined priority) the requirements of all systems that make an engine torque requirement. It also determines how dynamically each request is to be implemented.

For RPM limitation, the ME-SFI [ME] control unit reads in the following signals:

• Coolant temperature sensor (B11/4), coolant temperature
• Charge air temperature sensor (B17/8), charge air temperature
• Crankshaft Hall sensor (B70), engine RPM

The following systems can make an engine torque request:

• The driver, through the accelerator pedal sensor (B37)
• DISTRONIC, via chassis CAN 1 (CAN E1) and Electronic Stability Program control unit (N30/4) from the DISTRONIC electric controller unit (A89) (for code 239 (DISTRONIC PLUS))
• ESP®, via chassis CAN 1 from Electronic Stability Program control unit
• Cruise control, through the Electronic Stability Program control unit
• Transmission control, from the fully integrated transmission control unit (Y3/8n4) via the drive train CAN (CAN C) (from A/T)
• RPM limitation
• Maximum speed limit
• Maximum torque limitation

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 period of the fuel injectors for cylinders 1 to 6 (Y76/1 to Y76/6)
• Advancing or retarding the ignition timing of the ignition angle of the ignition coils for cylinders 1 to 6 (T11 to T1/6) (this allows very rapid variation of the engine torque)
• Combined adaptation of injection period and ignition angle

Torque reserve

A torque reserve is achieved by extending the injection period, while simultaneously adjusting the ignition angle to "retarded". This enriches the fuel/air mixture while also preventing any premature increase in torque through retarding the ignition timing of the ignition angle.

Finally, any required increase in engine torque is achieved if necessary by timing advance of the ignition angle. This enables a fast and comfortable increase in torque.

	Electrical function schematic for torque coordination		PE07.10-P-2713-97TAH
	Overview of system components for gasoline injection and ignition system with direct injection		GF07.70-P-9998MNC