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

GF07.61-P-3002MLK 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
- Engaged intake manifold length
- Left O2 sensor upstream of CAT (G3/3), oxygen sensor signal
- Right O2 sensor upstream of CAT (G3/4), oxygen sensor signal
- Crankshaft position sensor (L5), motor speed
- Sensor accelerator pedal (B37), driver engine load request
- Accelerator pedal sensor (B37), accelerator pedal actuation (fast, slow) (at acceleration)
- 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 requested engine torque.

Full-load operation function sequence
In full-load operation, when the throttle valve is fully open, the ME- SFI control unit extends the actuation time of the fuel injection valves, in order to ensure maximum engine torque.

In full-load operation, when the throttle valve is fully open, the ME- SFI control unit extends the actuation time of the fuel injection valves, in order to ensure maximum engine torque.

Acceleration function sequence
If the accelerator pedal position changes quickly, the throttle valve also opens or closes 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 lengthening or shortening the actuation time of the fuel injection valves according to the performance map. This prevents jerking.