Injection duration
Injection duration |
Fuel mass/combustion |
The fuel mass to be supplied to the engine per combustion has been calculated. The value is divided by 0.76 and is now converted to ml/combustion. The volume is accumulated for each combustion and the aggregate value is sent out on the bus. The main instrument unit uses the value for a correct fuel gauge display and the information display uses the value to calculate fuel consumption.
Injector opening time |
Fuel volume/combustion is converted into injector opening duration, based on knowledge of the injector flow at 3 bar differential pressure.
Injection twice per combustion |
Before the camshaft position has been detected, injection takes place semi-sequentially at 180° intervals. This means two cylinders at a time in the following order:
1. |
Cylinders 1 and 4.
|
2. |
Cylinders 2 and 3.
|
Each injector injects fuel once per crankshaft rotation and this means that the basic duration must be divided by two.
Needle lift delay |
The time taken for the needle in the injector to lift is voltage-dependent. Depending on the battery voltage, the delay time is added to the basic duration.