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
IGNITION:
The HT coils control is linked to the pick up signal after the recognition of the cylinders (see
figure above).
At low rpm (< 540) the ignition is set by the clipped signal of the pick up. The CPU gives
consensus to the ignition only. These are “fixed spark timing” and “ fixed dwell timing”
conditions.
At medium rpm levels, the spark dwell timing is fixed but the spark advance timing varies.
At high rpm (>3500) the ignition timing is calculated by the ECU and suitably compensated
(calculated spark and dwell timing conditions).
IDLING:
Applies to the 200 to 1200 rpm range. A hysterisis cycle is followed (as shown in the figure);
the spark and advance times are fixed.
540
200
1200
To Next Page
Loading...
Need help?
General
