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Electronic Accelerator Function - GF30.20-P-3015MRT

Engine 256.9 in model 213, 238, 257, 290 

Up To Model Year 2021 

Engine 256.9 in model 222 

Function requirements, general 

IMPORTANT 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.

Electronic accelerator, general points 

The electronic accelerator function is integrated in the ME-SFI [ME] control unit and controls, depending on the driver input and operating conditions, the opening angle of the throttle valve. The ME-SFI [ME] control unit regulates the throttle valve position, dependent on the following signals:

The requirements of the torque coordination function are also taken into account.

The electronic accelerator function is subdivided into the following points:

Engine torque control 

The ME-SFI [ME] control unit regulates the engine torque by:

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

The engine torque is solely determined by the accelerator pedal input, if no engine torque requests (e. g. cruise control request) are active.

The ME-SFI [ME] control unit detects the throttle valve position via the following components:

Driveability functions and load change damping 

Rapid accelerator pedal movements are not immediately translated into an engine torque. The engine torque is adapted to the request in a dampened manner. This avoids jolting in the drivetrain and improves ride comfort.

For this purpose, the throttle flap is only closed to the idle speed range in a delayed manner in the case of a sudden release of the accelerator. In this way, the engine torque reduces slowly and the vehicle does not slow down with jerks.

The drivability functions and the throttle change damping take place on the basis of the following signals:

Reverse travel 

During reversing, the throttle valve is opened more slowly and engine torque is limited to approx. 50 %. This optimizes ride comfort and driving safety in reverse travel.

Adaptive accelerator pedal 

The ME-SFI [ME] control unit changes the response time of the accelerator pedal depending on the vehicle speed calculated from the wheel speeds. At higher vehicle speeds, a slightly steeper accelerator pedal curve is used in order to improve the response time (reduction of free travel).

Further functions which support the electronic accelerator, are:

  Electrical function schematic for electronic accelerator Engine 256.9 in model 213, 238 up to model year 2021 PE30.20-P-2050-97DBA 
    Engine 256.9 in model 222 PE30.20-P-2050-97SEM
    Engine 256.9 in model 257, 290 up to model year 2021 PE30.20-P-2050-97XBB
  Overview of system components for gasoline injection and ignition system with direct injection   GF07.70-P-9998MRT
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