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

Engine 274.9 in model 205.047/053/054/147/247/253 

Engine 274.9 in model 253.354/954 

Function requirements for the electronic accelerator, general points

Electronic accelerator, general points 

The electronic accelerator function is integrated in the ME-SFI [ME] control unit (N3/10) and controls the drivetrain torque depending on the driver command and the operating conditions.

IMPORTANT Drivetrain torque

On vehicles with internal combustion engine without hybrid drive, the drivetrain torque is the torque from the internal combustion engine which is transmitted to the drivetrain via the crankshaft.

On vehicles with hybrid drive, the torques from the internal combustion engine and the electrical machine (A79/1) are added together, resulting in a drivetrain torque.

The ME-SFI [ME] control unit regulates the drivetrain torque according to the following sensors and signals:

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

Function sequence for electronic accelerator 

The function sequence is described in the following steps:

Function sequence for drivetrain torque specification 

The ME-SFI [ME] control unit controls the drivetrain torque based on a characteristics map depending on the accelerator pedal sensor. To do so, the ME-SFI [ME] control unit actuates the following assembly parts in driving operation with the internal combustion engine or in hybrid driving mode:

If traction on vehicles with a hybrid drive is not provided exclusively by the internal combustion engine, e.g. in the case of hybrid driving mode or electric mode (cruising mode, maneuvering), the ME-SFI [ME] control unit sends a request for a specified torque of the electrical machine via the engine CAN (CAN C), powertrain control unit and hybrid CAN to the power electronics control unit (N129/1).

The drivetrain torque is only determined exclusively from the accelerator pedal position if no limited or increased torque requests from other functions or control units (e.g. cruise control request) are active. The actual value potentiometers 1 and 2 (M16/6r1, M16/6r2) report the current throttle valve position to the ME-SFI [ME] control unit.

Function sequence for drivability functions 

The drivability functions and throttle change damping have the task of limiting the change in drivetrain torque caused by rapid movement of the accelerator pedal. The limitation serves to improve the ride comfort since jolting in the drivetrain is prevented.

On vehicles with hybrid drive, dynamic torque interventions are not implemented exclusively using the torque reserve of the internal combustion engine. The ME-SFI [ME] control unit initially implements torque interventions in the current drivetrain torque via the electrical machine. To do this, it requests a motor-generated torque from the electrical machine from the power electronics control unit via the hybrid CAN, powertrain control unit and engine CAN to increase the torque. Reducing torque interventions are realized through requests for a generated torque.

The power electronics control unit implements these requests and reports back the torque generated in this manner via the hybrid CAN (CAN L), powertrain control unit and engine CAN to the ME-SFI [ME] control unit. If the torque interventions of the electrical machine are not sufficient then the torque from the internal combustion engine is additionally reduced or increased (torque reserve). The drivability functions and the throttle change damping take place on the basis of the following sensors and signals:

Function sequence for reverse travel 

If the fully integrated transmission control unit sends the CAN signal "reverse travel" via drive train CAN, the vehicle speed is limited to 60 km/h by the ME-SFI [ME] control unit. This optimizes driving safety during reverse travel.

Function sequence for 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 speed. At higher vehicle speeds a somewhat steeper accelerator pedal curve is used in order to improve the response time (reduction of the free travel).

  Electrical function schematic for electronic accelerator   PE30.20-P-2050-97FBH 
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