Electronic accelerator function - GF30.20-P-3015MMQ

ENGINE 276.8 in MODEL 207, 212 as of model year 2014 

ENGINE 276.8 in MODEL 218 as of model year 2015 

ENGINE 276.9 in MODEL 207, 212 (except 212.095), 218 as of model year 2014 

Function requirements for the electronic accelerator, general points 

• Circuit 87M (engine management ON)
• Engine runs

Electronic accelerator, general points 

The electronic accelerator function is integrated into the ME-SFI [ME] control unit (N3/10) and controls the opening angle of the throttle valve dependent upon the driver input and the operating conditions.

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

• Accelerator pedal sensor (B37), accelerator pedal position
• Electronic Stability Program control unit (N30/4) (except code 233 (DISTRONIC PLUS) or Electronic Stability Program Premium control unit (N30/7) (for code 233 (DISTRONIC PLUS), brake actuation via chassis CAN 1 (CAN E1)
• Electronic Stability Program control unit cruise control request, via chassis CAN 1
• Radar sensors control unit (N62/1) (for model 207, 212 as of model year Model 2014 with code 23P (Driving Assistance Package Plus), model 218 as of model year 2015 with code 23P (Driving Assistance Package Plus)), engine torque request (increasing or reducing) via the chassis CAN 1
• Video and radar sensor system control unit (N62/2) (for model 218 up to model year 2015 with code 233 (DISTRONIC PLUS), with code 237 (Active Blind Spot Assist), with code 238 (Active Lane Keeping Assist)), engine torque request via the chassis CAN 1
• Fully integrated transmission control controller unit (Y3/8), gear range over drive train CAN (CAN C)
• Fully integrated transmission controller unit, reverse travel signal via the drive train CAN

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 engine torque specification 
• Function sequence for drivability functions 
• Function sequence for reverse travel 
• Function sequence for adaptive accelerator pedal 

Function sequence for engine torque specification 

The ME-SFI [ME] control unit controls the engine torque dependent on a characteristic map, dependent on the accelerator pedal sensor. To do this the ME-SFI [ME] control unit actuates the following components:

• Actuator motor (M16/6m1) in the throttle valve actuator (M16/6) by means of a pulse width modulated signal
• Ignition coils (T1) for regulation of the ignition angle efficiency (results from shifting of the actual ignition angle from the optimal ignition angle) via the ignition timing.
• Fuel injectors (Y76) to regulate the lambda value over the fuel quantity

The engine torque is then only determined by 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 (M166r1, M166r2) in the throttle valve actuator report the current throttle valve position to the ME-SFI [ME] control unit.

The position feedback of the throttle valve actuator takes place by means of a contact-less angular sensor.

Function sequence for drivability functions 

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

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

• Accelerator pedal sensor, accelerator pedal actuation (fast, slow)
• Crankshaft Hall sensor (B70), engine RPM
• Coolant temperature sensor (B11/4) (model 204, 207, 212), coolant temperature sensor (B11/4) (model 218)
• Pressure sensor downstream of throttle valve (B28/7), engine load
• Left and right oxygen sensors upstream of catalytic converter (G3/3, G3/4)
• Left and right oxygen sensors downstream of catalytic converter (G3/5, G3/6)
• Electronic Stability Program control unit, wheel speed via chassis CAN 1

Function sequence for reverse travel 

If the fully integrated transmission control controller unit sends the CAN signal "Reverse travel" over drive train CAN, the ME-SFI [ME] control unit restricts the engine torque to approx. 50 %. This optimizes ride comfort and driving safety when 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).

Further functions which support the electronic accelerator and which are described are:

• RPM control, function 
• Torque coordination, function 
• Engine limp-home mode, function 

Electrical function schematic for electronic accelerator	MODEL 207	PE30.20-P-2050-97EAK
	MODEL 212	PE30.20-P-2050-97DAQ
	MODEL 218	PE30.20-P-2050-97XAI
Overview of system components for gasoline injection and ignition system with direct injection	ENGINE 276.9 in MODEL 207, 212 (except 212.095), 218 as of model year 2014	GF07.70-P-9998MM
	ENGINE 276.8 in MODEL 207, 212 as of model year 2014 ENGINE 276.8 in MODEL 218 as of model year 2015	GF07.70-P-9998MMP