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ME-SFI electronic accelerator, function - GF30.20-P-3012MIS

ENGINES 272.9 in MODEL 221.0 /1 as of model year 2009 /YoM 08 

ENGINES 273.9 in MODEL 216.3, 221.0 /1 as of model year 2009 /YoM 08 

Function requirements for the electronic accelerator, general points 

Electronic accelerator, general points 

The electronic accelerator function is integrated and controlled in the ME-SFI control unit (N3/10) depending on the driver input and the operating condition, the opening angle of the throttle valve.

The ME-SFI [ME] control unit regulates the throttle valve position according to the following sensors and signals:

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

Electronic accelerator function sequence 

The function sequence is described in the following steps:

Throttle valve actuation function sequence 

Depending on the accelerator pedal sensor, the ME-SFI [ME] control unit actuates the throttle valve actuator (M16/6) according to a performance map. To do this, the ME-SFI control unit operates the actuator motor (M16/6m1) in the throttle valve actuator with a pulse width modulated signal (PWM signal). Provided there are no limiting functions active (for example, cruise control request), the opening angle of the throttle valve is determined by the accelerator pedal position alone.

The actual value potentiometers 1 and 2 (M16/6r1, M16/6r2) report the current throttle valve position to the ME-SFI [ME] control unit.

Throttle valve damping function sequence 

The ME-SFI [ME] control unit controls the throttle valve damping according to the following sensors and signals:

The purpose of throttle valve damping is to delay closing of the throttle valve down to idle speed range if the accelerator pedal is suddenly released. In this way, the engine torque reduces slowly and the vehicle does not slow down with jerks.

Reverse travel function sequence 

If the ETC electric controller unit sends the "reverse travel" CAN signal over the drive compartment CAN, the ME-SFI control unit opens the throttle valves slowly and limits the maximum opening angle to about 50 %. This optimizes ride comfort and driving safety when reversing.

Adaptive accelerator pedal function sequence 

The ME-SFI [ME] control unit recognizes how the accelerator pedal is being actuated and switches between characteristic curves. After a 50% pedal travel, about 80% of the engine load is released for a sporty driver and 40% of the engine load is released for a quiet driver. There is no further difference felt above a pedal travel of about 90%.

IMPORTANT If the calm driver characteristic is active (for example, after a long journey on the freeway), the accelerator pedal at first has to be pressed unusually far in order to obtain high acceleration.

IMPORTANT Further functions which support the electronic accelerator and which are described in other documents are:

REFER TO SYSTEM WIRING DIAGRAMS Electrical function schematic for electronic accelerator Model 216 PE30.20-P-2050-97CAB
Model 221 PE30.20-P-2050-97SAB
  ME-SFI [ME] control unit, component description N3/10
Engine 272 except 272.974 (hybrid)		 GF07.61-P-6000MIS
N3/10
Engine 272.974 (hybrid)		 GF07.61-P-6000MEH
N3/10
Engine 273		 GF07.61-P-6000MLS
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