CDI main injection, function - GF07.16-P-2009IC
ENGINE 647.961 in MODEL 211
ENGINE 648.960 in MODEL 220
ENGINE 648.961 in MODEL 211
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
| Component description for the fuel injectors | Y76 | GF07.03-P-6120IC | |
| Component description for the crankshaft position sensor | L5 | GF07.04-P-6010IC | |
| Component description for the coolant temperature sensor | B11/4 | GF07.04-P-6040IC | |
| Component description for the charge air temperature sensor | B17/8 | GF07.04-P-6050IC | |
| Component description for the boost pressure sensor | B5/1 | GF07.04-P-6051IC | |
| Component description for the rail pressure sensor | B4/6 | GF07.04-P-6210IC | |
| Component description for the quantity control valve | Y94 | GF07.05-P-6010IC | |
| Component description for the pressure regulator valve | Y74 | GF07.05-P-6020IC | |
| Component description for the hot film MAF sensor | B2/5, B2/5b1 | GF07.07-P-6000IC | |
| Component description for the CDI control unit | N3/9 | GF07.16-P-6000IC | |
| Component description for the accelerator pedal sensor | B37 | GF30.20-P-2010IC | |
| Component description for the fuel temperature sensor | B50 | GF47.50-P-2010IC |