Section 07
ENGINE MANAGEMENT (DI)
Subsection 02
(OVERVIEW)
07-02-2
SMR2003-023_07-02A.FM
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 pneu-
matically assisted direct injection system, a
unique combustion chamber geometry and a pre-
cise 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.
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 driv-
en by the counterbalance shaft. It also supplies the
air pressure required to operate the RAVE valves.
FUEL DELIVERY SYSTEM
BASIC OPERATION
When the piston reaches the correct position, the
MPEM opens the fuel injector and fuel is dis-
charged 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-
pressed air which breaks the fuel up into a very
fine mist in the process. This air/fuel mixture is
then ignited by the spark plug.
AIR/FUEL RAIL ASSEMBLY
TYPICAL
1. Air/fuel rail
2. Fuel injector
3. Fuel pressure regulator
4. Air pressure regulator
5. Air inlet hose
6. Fuel inlet
7. Air return
8. Fuel return
1
F12F05A
1
F12D01A
2
5
F12F06A
4
3
2
6
7
8
1
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Содержание 2003 GTI LE RFI
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