GF07.61-P-3002MIR ME Injection Regulation, Function

GF07.61-P-3002MIR ME Injection Regulation, Function
- refinement package
- as of model year 09


Function requirements for injection regulation, general points
^ Circuit 87M ON (engine control ON)
^ Engine running

Injection regulation, general points
The engine receives the fuel quantity required in each case from the ME-SFI control unit (N3/10).

Using the performance map, the ME-SFI control unit calculates the injection time required according to the following sensors and signals:
- Hot film MAF sensor (B2/5), engine load
- Intake air temperature sensor (B2/5b1)
- Coolant temperature sensor (B11/4)
- Pressure sensor (B28), intake manifold air pressure
- Tumble flap position sensor of LH intake manifold (B28/9), LH tumble flap position (except engine 272.968)
- Tumble flap position sensor of RH intake manifold (B28/10), RH tumble flap position (except engine 272.968)
- LH and RH intake camshaft Hall sensors (B6/4, B6/5), intake camshaft positions
- LH and RH exhaust camshaft Hall sensors (B6/6, B6/7), exhaust camshaft positions
- Accelerator pedal sensor (B37), driver engine load request
- Accelerator pedal sensor, accelerator pedal activity (fast, slow) (when accelerating)
- Crankshaft Hall sensor (B70), motor speed
- LH and RH O2 sensor upstream of CAT (G3/3, G3/4), oxygen sensor signals
- Altitude pressure sensor in the ME-SFI control unit, atmospheric air pressure for altitude adaptation
- Intake manifold switchover (except engine 272.968)
- Correction programming with the DAS (during acceleration)

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

Injection regulation function sequence
The ME-SFI 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 control unit calculates the actuation time of the fuel injection valves (Y62) according to the lambda control and the required engine torque.

Full-load operation function sequence
In full-load operation, when the throttle valve is fully open, the ME-SFI control unit lengthens 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
If accelerator pedal position changes rapidly, the throttle valve opens or closes more quickly. This causes the mixture to become briefly leaner or more rich.
To prevent this, the ME-SFI control unit adapts the fuel-air mixture, by shortening or lengthening the actuation time of the injection valves according to a performance map. This prevents the engine from jerking.