ME-SFI [ME] injection regulation, function - GF07.61-P-3002G
ENGINE 273 in MODEL 463.202/222/236/237 up to 31.5.12 as of model year 2009/YoM 08
Function requirements for injection regulation of the ME gasoline injection and ignition system (motor electronics) (ME), general points
- Circuit 87M ON (engine control ON)
- Engine running
ME injection regulation, general points
The engine receives the fuel quantity required in each case from the ME-SFI [ME] control unit.
Using the performance map, the ME-SFI [ME] control unit calculates the injection time required according to the following sensors and signals:
- Hot film MAF sensor, engine load
- Intake air temperature sensor
- Coolant temperature sensor
- Pressure sensor, intake manifold air pressure
- Intake manifold tumble flap position sensor on the left, tumble flap position on the left
- Intake manifold tumble flap position sensor on the right, tumble flap position on the right
- LH and RH intake camshaft Hall sensor, intake camshaft positions
- LH and RH exhaust camshaft Hall sensor, exhaust camshaft positions
- Accelerator pedal sensor, driver engine load request
- Accelerator pedal sensor, accelerator pedal operation (fast, slow) (when accelerating)
- Crankshaft Hall sensor, engine speed
- LH and RH O2 sensor upstream of catalytic converter, oxygen sensor signals
- Altitude pressure sensor in ME-SFI [ME] control unit, atmospheric pressure for altitude adaptation
- Engaged intake manifold length
- Correction programming with the Diagnosis Assistance System (DAS) (for acceleration)
The requirements of the engine torque requirement function are also taken into account.
ME-SFI injection regulation, function sequence
The ME-SFI [ME] control unit controls the injection time in the following operating conditions:
- Partial load operation function sequence
- Full-load operation function sequence
- Acceleration function sequence
Partial load operation function sequence
In partial load operation when the engine is warm, the ME-SFI [ME] control unit calculates the actuation time of the injection valves (Y62) according to the lambda control and the engine torque requirement.
Full-load operation function sequence
In full-load operation when the throttle valve is fully open, the ME-SFI [ME] control unit extends the actuation time of the fuel injection valves in order to ensure maximum engine torque.
About 10 to 90% of the slewing range on the accelerator pedal sensor is partial load and more than about 90% of the slewing range is defined as full load.
Acceleration function sequence
When there is rapid variation of the accelerator pedal position, the throttle valve also opens and closes rapidly. This causes the mixture to become briefly leaner or more rich.
To prevent this, the ME-SFI [ME] control unit adapts the fuel-air mixture, by lengthening or shortening the actuation time of the fuel injection valves according to a performance map.
This prevents jerking of the engine.
| Component description for ME-SFI [ME] control unit | N3/10 | GF07.61-P-6000G |