GF07.16-P-2009IC CDI Main Injection, Function

GF07.16-P-2009IC CDI Main Injection, Function

Component Identification:

The injected quantity required by the engine is divided into the preinjection quantity and the main injection quantity If the main injection quantity calculated by the CDI control unit is insufficient, no preinjection takes place.

Start of actuation of fuel injectors
The start of actuation of the fuel injectors is calculated according to the operating point of the CDI control unit. This takes place with consideration of the following:
^ Main injection quantity
^ Engine speed
^ Coolant temperature
^ Charge air temperature
^ Vehicle power supply voltage
^ Preinjection

Actuation duration of fuel injectors
The actuation duration of fuel injectors is calculated by the CDI control unit. This takes place with consideration of the following:
^ Main injection quantity
^ Engine speed

Calculation of the individual injection quantities
The injection quantity is calculated by the CDI control unit using the following input signals:
^ Engine load
^ Engine speed
^ Coolant temperature
^ Charge air temperature
^ Charge air pressure
^ Rail pressure
^ Fuel temperature
^ Atmospheric pressure

Injection quantity = Preinjection quantity + Main injection quantity

Switching off main injection
Main injection is switched off in line with the operating point if:
^ the engine speed is too high.
^ the injection quantity is too low.
^ the fuel pressure in the rail is inadequate.
^ External quantity control takes place (e.g. via ESP)
^ Engine in overrun mode
^ the engine is switched off