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

Engine 264.9 in Model 205, 253 

Function requirements, general 

• Engine runs

The ME-SFI [ME] control unit (N3/10) detects the Engine running via the evaluation of the crankshaft Hall sensor signals (B70). The ME-SFI [ME] control unit directly reads in the signals of the crankshaft Hall sensor.

Torque coordination, general 

The torque harmonization interface in the ME-SFI [ME] control unit coordinates and prioritizes (according to feasibility and specified priority) all Engine torque requests. Engine torque requests can be made by the driver or different driver assistance systems. How dynamically a request should be implemented is specified for every request.

The following driver assistance systems and functions can make an Engine torque request:

• Driver request

  The powertrain control unit (N127) reads in the accelerator pedal sensor (B37) signals directly, and transmits the accelerator pedal position via the drive CAN (CAN C1) to the ME-SFI [ME] control unit.

• Electronic Stability Program (ESP®)

  The Electronic Stability Program control unit (N30/4) transmits the Engine torque request via the suspension FlexRay (Flex E), powertrain control unit and drive CAN to the ME-SFI [ME] control unit.

• Cruise control

  The Electronic Stability Program control unit transmits the Engine torque request via the chassis FlexRay, the powertrain control unit and the drive train CAN to the ME-SFI [ME] control unit.

• Transmission control

  The fully integrated transmission control unit (Y3/8n4) transmits the Engine torque request via the drive train CAN to the ME-SFI [ME] control unit.

• DISTRONIC (with code 239 (Active Distance Assist DISTRONIC) or code 23P (Driving Assistance Package))

  with code 239 (Active Distance Assist DISTRONIC) 

  The Distance Pilot DISTRONIC control unit (A108/1) (model 205) or Active Distance Assist DISTRONIC electric controller unit (A108/1) (model 253) transmits the Engine torque request via the suspension FlexRay to the Electronic Stability Program control unit.

  The Electronic Stability Program control unit transmits the request via the suspension FlexRay, the powertrain control unit, and the drive CAN to the ME-SFI [ME] control unit.

  with code 23P (Driving assistance package) 

  The Mercedes-Benz Intelligent Drive control unit (N62/4) transmits the Engine torque request via the suspension FlexRay to the Electronic Stability Program control unit. The Electronic Stability Program control unit transmits the request via the suspension FlexRay, the powertrain control unit, and the drive CAN to the ME-SFI [ME] control unit.

• RPM limitation
• Maximum vehicle speed limit
• Maximum torque limitation

The ME-SFI [ME] control unit adapts the Engine torque to the Engine torque request by:

• Adjusting the opening angle of the throttle valve
• Extending or shortening the fuel injection duration
• Advancing or retarding the ignition angle. In this way, very rapid change of the Engine torque is possible.

The ME-SFI [ME] control unit actuates the following components for this purpose:

• Throttle valve
  • Throttle valve actuator motor (M16/6m1) in throttle valve actuator (M16/6)
• Fuel injection system
  • Cylinder 1 fuel injector (Y76/1)
  • Cylinder 2 fuel injector (Y76/2)
  • Cylinder 3 fuel injector (Y76/3)
  • Cylinder 4 fuel injector (Y76/4)
• Ignition system
  • Cylinder 1 ignition coil (T1/1)
  • Cylinder 2 ignition coil (T1/2)
  • Cylinder 3 ignition coil (T1/3)
  • Cylinder 4 ignition coil (T1/4)

A torque reserve is achieved by extending the injection period, while simultaneously adjusting the ignition angle to "retarded". This makes the fuel/air mixture "richer", while also preventing a premature torque increase by retarding the ignition angle. Then the Engine torque is then increased by a advancing the ignition angle.

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