Ducati Monster 695 User Manual page 314

Description of the fuel injection-ignition system
Marelli injection-ignition system (I.A.W.)
The Marelli injection-ignition system is the Alfa/N type, in which the engine speed and throttle position
are used as main parameters for measuring the quantity of intake air. If the quantity of air is known,
the quantity of fuel is dosed in accordance with the required mixture. Other sensors in the system
(engine sensor, atmospheric pressure, air temperature, engine oil temperature sensors and lambda
sensor for CO control) are used to adjust the basic engine control strategy according to operating
conditions. The engine speed and the throttle angle also make it possible to calculate the optimal
advance for all types of operating conditions. The quantity of air taken in by each cylinder, during each
cycle, depends on the density of the air in the intake manifold, the cylinder capacity and the volumetric
efficiency.
Volumetric efficiency is experimentally taken onto the engine in the whole operating range (rotation
speed and engine load conditions). Taken values are then used for the generation of a map which is
stored into the I.A.W. 5 AM2 ECU Flash Eprom for injection control. The Flash Eprom can be
programmed via serial line. Injectors are controlled through a "timed sequence", i.e. not at the same
time. Fuel delivery to each cylinder can be started from the expansion stage up to the intake stage,
already in progress. Delivery stop, that is when injectors are closed, is saved onto a special map,
which is stored in the ECU Flash Eprom. Ignition is of the static inductive discharge type, featuring
"dwell time" control so to ensure coil charging at steady power. Power modules for coil power supply
are included in the CPU hardware. Advance curves are stored into the CPU Flash Eprom. Both coils
and power modules are controlled by the ECU, which processes ignition advance.
Note
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