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

Engine 177.9 in model 205, 253 

Engine 177.9 in model 213 

up to model year 2021 

Function requirements, general 

• Engine runs

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

Torque coordination, general 

The torque interface in the ME-SFI [ME] control unit (N3/10) coordinates and prioritizes (according to feasibility and defined priority) the engine torque requests of different systems via the pedal angle of the accelerator pedal and the engine torque requests. It also determines how dynamically each request is to be implemented. The ME-SFI [ME] control unit for model 205, 253 reads in the signals of the accelerator pedal sensor directly (B37). With model 213, the powertrain control unit (N127) reads in the signals from the accelerator pedal sensor directly and sends these via the drive train CAN (CAN C1) to the ME-SFI [ME] control unit.

The following systems can make an engine torque request:

• Electronic Stability Program

  The Electronic Stability Program control unit (N30/4) transmits the engine torque request via the chassis FlexRay (Flex E), the powertrain control unit and the drive train 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 (model 205, 253 with code 239 (DISTRONIC PLUS) or code 23P (Driving Assistance Package)

  The DISTRONIC electric controller unit (A89) (with code 239 (DISTRONIC PLUS)) or the radar sensors control unit (N62/1) (with code 23P (Driving Assistance Package)) sends the engine torque request via the chassis FlexRay to the Electronic Stability Program control unit. 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.

• DISTRONIC (model 213 with code 239 (DISTRONIC PLUS) or code 23P (Driving Assistance Package) or code P20 (Driving Assistance Package Plus))

  The DISTRONIC Distance Pilot controller unit (A108/1) (with code 239 (DISTRONIC PLUS)) or the Intelligent Drive control unit (N62/4) (with code 23P (Driving Assistance Package)) or code P20 (Driving Assistance Package Plus)) transmits the engine torque request via the chassis FlexRay to the Electronic Stability Program control unit. 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.

• 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 angles of the throttle valves.
• Extending or shortening the injection duration of the fuel injectors.
• 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 valves
  • Left throttle valve actuator motor (M16/60m1) in left throttle valve actuator (M16/60)
  • Right throttle valve actuator motor (M16/61m1) in right throttle valve actuator (M16/61)
• 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)
  • Cylinder 5 fuel injector (Y76/5)
  • Cylinder 6 fuel injector (Y76/6)
  • Cylinder 7 fuel injector (Y76/7)
  • Cylinder 8 fuel injector (Y76/8)
• Ignition system
  • Cylinder 1+2 ignition coil (T4)
    • Cylinder 1 ignition coil (T4t1)
    • Cylinder 2 ignition coil (T4t2)
  • Cylinder 3+4 ignition coil (T4/1)
    • Cylinder 3 ignition coil (T4/1t3)
    • Cylinder 4 ignition coil (T4/1t4)
  • Cylinder 5+6 ignition coil (T4/2)
    • Cylinder 5 ignition coil (T4/2t5)
    • Cylinder 6 ignition coil (T4/2t6)
  • Cylinder 7+8 ignition coil (T4/3)
    • Cylinder 7 ignition coil (T4/3t7)
    • Cylinder 8 ignition coil (T4/3t8)

Torque reserve:

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	Engine 177.9 in model 205, 253	PE07.10-P-2713-97FBD
		Engine 177.9 in model 213 up to model year 2021	PE07.10-P-2713-97DBG
	Overview of system components for gasoline injection and ignition system with direct injection	Engine 177.9 in model 205, 253	GF07.70-P-9998MNA
		Engine 177.9 in model 213 up to model year 2021	GF07.70-P-9998MNE