ME-SFI electronic accelerator, function - GF30.20-P-3012CY
ENGINE 272.911 in MODEL 204.0 up to Model Year 08/AEJ 07
ENGINE 272.921 in MODEL 204.0/2 up to Model Year 08/AEJ 07
ENGINE 272.947 in MODEL 204.0/2 up to Model Year 08/AEJ 07
ENGINE 272.948 in MODEL 204.0 up to Model Year 08/AEJ 07
ENGINE 272.961 in MODEL 204.0/2 up to Model Year 08/AEJ 07
ENGINE 272.971 in MODEL 204.0 up to Model Year 08/AEJ 07
The electronic accelerator function is integrated and controlled in the motor electronics control unit (N3/10) depending upon the driver input and the operating condition, the opening angle of the throttle valve.
Input signals for the electronic accelerator pedal:
- Accelerator pedal position
- Brake actuation (from the Electronic Stability Program control unit (N30/4))
- Cruise control mode (from the Electronic Stability Program control unit)
- Engine torque requests (via drive train CAN (CAN C) and chassis CAN (CAN E))
- Gear ranges (over the electronic selector lever module control unit (N15/5)) (for automatic transmission 722.9)
- Clutch operating system (for manual transmission 716.6)
- Reverse travel (via the front SAM control unit with fuse and relay module (N10/1)) (for manual transmission 716.6)
The position of the accelerator pedal and the speed at which the position of the accelerator pedal changes are transmitted to the accelerator pedal sensor located on the accelerator pedal mechanically. B37 The Hall sensor in the accelerator pedal sensor sends an appropriate voltage signal to the ME-SFI [ME] control unit. It evaluates the voltage signal and actuates the throttle valve actuator (M16/6) on the basis of the performance map. The opening angle of the throttle valve is altered accordingly by the actuator motor (M16/6m1) in the throttle valve actuator.
The opening angle is only determined by the accelerator pedal request if no limiting functions are active (e.g. idle request or a torque reduction).
The throttle valve actual value potentiometer (M16/6r1) reports the current throttle valve position to the ME-SFI [ME] control unit.
Throttle valve damping
The throttle valve damping function closes the throttle valve up to the idle speed range with a time delay if the accelerator pedal is suddenly released. In this way, the engine torque goes down slowly and the vehicle does not slow down with jerks.
Following input signals are processed:
- Change in the speed of the accelerator pedal position.
- Engine speed
- Coolant temperature
- Throttle valve position
- Vehicle speed
Reversing
If the ME-SFI [ME] control unit recognizes a reverse travel, the throttle valve will be opened more slowly and the maximum opening angle limited to about 50%. This function has the task of optimizing ride comfort and safety when reversing.
Adaptive accelerator pedal
The ME-SFI [ME] control unit evaluates 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%.
If, for example, the characteristic curve for a quiet driver is active after a long drive on the freeway then the accelerator pedal must be pressed down unusually hard to obtain a higher acceleration level.
Additional functions of the electronic accelerator pedal:
- Idle speed control
- Cruise control (CC [TPM])
- Torque interface
- Emergency running
If the brake pedal is operated, this always means idle speed input.
| Electrical function schematic for electronic accelerator | PE30.20-P-2050-99FAB | |||
| Component description for coolant temperature sensor | B11/4 | GF07.04-P-6043CY | ||
| Crankshaft Hall sensor component description | B70 | GF07.04-P-6221CY | ||
| Hot film mass air flow sensor, component description | B2/5, B2/5b1 | GF07.07-P-6000CY | ||
| ME-SFI [ME] control unit, component description | N3/10 | GF07.61-P-6000CY | ||
| Component description for the clutch pedal switch | S40/3 | For manual transmission 716.6 | GF29.10-P-2200CY | |
| S40/5 | For manual transmission 716.6 With code 494 USA version |
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| Component description for accelerator pedal sensor | B37 | GF30.20-P-2011CY | ||
| Component description for the throttle valve actuator | M16/6 | GF30.20-P-2021CY | ||