Management of the injection

In particular, the signal is composed as follows.

There are sixty teeth on the flywheel, two of which have been removed to create discontinuity: the angle between the two consecutive teeth is therefore 6°;

The synchronism point is recognized at the end of the first tooth following the two missing teeth: the flywheel is fitted so that as the engine passes this tooth cylinders 1 and 4 are 17 teeth before TDC.

1. Engine rpm and TDC sensor
2. Gap
3. Flywheel 60-2 teeth
4. Signal corresponding to two missing teeth
5. Flywheel signal (engine speed sensor)

MANAGEMENT OF THE INJECTION

The injection management strategies are designed to provide the engine with the correct quantity of fuel at the desired moment according to the engine operating conditions.

The management of the injection basically consists of calculating the injection time, determining the injection phase and then the implementation by operating the injector.

The "basic" injection time is calculated by means of mathematical interpolation of the speed-load map: the figures contained in the map, which have been obtained experimentally, also depend on the characteristics of the injector.

The "final" injection time "is determined by means of a calculation algorhythm in which the "basic" injection time is corrected by a series of coefficients which take into account the different engine operating conditions which are highlighted by the various system sensors.