System mangement strategies

SYSTEM MANGEMENT STRATEGIES

MANAGEMENT OF THE SIGNALS

During starting, the control unit recognizes the injection and ignition timing which are fundamental for the subsequent operation of all strategies.

This recognition is implemented on the basis of the interpretation of the signals coming from the flywheel sensor on the crankshaft and the engine timing senor on the camshaft.

NOTE The term signals refers to the collection of signals coming from the sensor on the crankshaft and the one on the camshaft which, having a precise reciprocal position, provide the control unit with a synchronized sequence of signals which the control unit is capable of recognizing.

In particular, the signals are made up as follows:

• flywheel on the crankshaft: it is equipped with two symmetrical sets of teeth, arranged 10°, 65° and 97° in advance of each TDC;
• wheel on the camshaft: it is fitted with two long inspections windows and one short one, whose width and position are such as to provide the signal as illustrated in the diagram.

1. Cylinder TDC
2. Crankshaft angles
3. Crankshaft flywheel signal (engine rpm sensor)
4. Camshaft wheel signal (engine timing sensor)

NOTE The numerical values for the signals indicate the crankshaft advance angles in relation to the next TDC.