Section 07 ENGINE MANAGEMENT (DI)
Subsection 01 (OVERVIEW)
OVERVIEW
OPERATING PRINCIPLE
The Orbital Combustion Process (OCP) provides
a stratified combustion process resulting from
the direct injection of a finely atomized fuel spray
(less than 10 microns). This is achieved by using
a pneumatically assisted direct injection system,
a unique combustion chamber geometry and a
precise control of the combustion process by the
MPEM (Multi-Purpose Electronic Module).
AIR INDUCTION
Air for combustion is drawn directly at the base
of the engine through two 46 mm throttle bodies.
The air flow is controlled by two throttle plates.
The air continues through the reed valves into the
crankcase.
1
F12F05A
1
TWIN 46 MM THROTTLE BODIES
1. Throttle position sensor (TPS)
AIR COMPRESSOR SYSTEM
The air compressor supplies the compressed air
required for fuel atomization in the air injector. It
is integrated with the engine and mechanically
driven by the counterbalance shaft. It also sup-
plies the air pressure required to operate the RAVE
valves.
F12D01A
FUEL DELIVERY SYSTEM
BASIC OPERATION
When the piston reaches the correct position,
the MPEM opens the fuel injector and fuel is
discharged into a cavity inside the direct injector.
Next, the direct injector opens and the fuel is dis-
charged into the combustion chamber by the com-
pressedairwhichbreaksthefuelupintoavery
fine mist in the process. This air/fuel mixture is
then ignited by the spark plug.
smr2004-Complete Line Up 327
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