Technical data

Aprilia Consumer Service Spa

Technical Service and Training

Release 4 july 99

This material is didactic and

may be changed following the technical

development of the product

2. Cylinder recognition

The camshaft and pick up sensors send signals that are clipped by the ECU.

The camshaft sensor sends one signal for each cycle (INT-COMPRESS-

IGNITION/EXPANSION-EXHAUST), corresponding to an angle of 720°

The camshaft sensor sends 12 signals for each rotation of the crankshaft, i.e. one signal every

60°.

The first camshaft pulse enables the resetting of an internal counter which starts the

synchronous ignition phase and cylinder recognition.

The following phase is known as asynchronous as both the injectors inject fuel into the ducts.

The ignition phase is illustrated in the diagram below.

OFF

spark