Engine Management; Foreword - APRILIA SL Mille Workshop Manual

SL mille
4.7 ENGINE MANAGEMENT
4.7.1 FOREWORD
The "heart" of the engine's management consists in the
electronic Engine Control Unit which manages and opti-
mizes the ignition and injection of the fuel.
- The ignition management. depends on the specific
consumption levels. The engine control unit measures
the exact ignition angle based on the engine rpm sig-
nals and on the position of the throttle valves (quantity
of air).
The engine control unitrnanaqes the injection time
(quantity of fuel) based on the rpm signal, the throttle
valve signal (quantity of air, pressure of induction pipe)
and correction factors of the various .sensors.
Every time the engine is switched on, the engine con-
trol unit checks the sensors and ignition coils, making
sure they are working correctly. If any anomalies are
encountered, the message"
EF I "
flashes on the dis-
play.
The safety devices inside the engine control unit stop
ignition and the injection of the fuel when the speed
exceeds the permissible peak rpm, which is 10500
rpm, or if the vehicle falls over.
When the vehicle is set on the side stand arid a gear is
engaged, ignition is, stopped,preventing the vehicle
from starting.
Any modifications or variations made to the exhaust
system, intake system or the engine control unit may
result in serious damage to the engine.
The' assembly, modification or use of non-original
parts shall cause any warranty to become void and
shall exempt the manufacturer from any liability.
KEY
1) Signals
2) Driving shaft position sensor (engine rpm)
3) Throttle valve potentiometer (position of the throttle
valves)
4) Other sensors
5) Electronic unit
6) Standard data
7) Correction factors
8) Ignition coil (ignition angle)
9) Injector (injection time)
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CD
FUEL SUPPLY SYSTEM
Release 00/2001-05
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