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Просмотр инструкции снегоходы Ski Doo SUMMIT 2005, страница 640
Section 04 ENGINE MANAGEMENT (SDI)
Subsection 01 (OVERVIEW)
OPERATING PRINCIPLE
For this SDI 2-stroke engine, a highly advanced en-
gine management system (EMS) has been used to
ensure a high power output combined with clean-
er combustion. An ECM (Engine Control Module)
calculates the proper air/fuel mixture and ignition
timing for each cylinder separately. The fuel is in-
jected into the transfer port of each cylinder.
CHARGING SYSTEM
The magneto is the primary source of electrical
energy. It transforms magnetic field into electric
current (AC).
The magneto has a 3 phases, delta wound stator
on 18 poles. Capacity is 480 watts.
AC current is rectified and regulated between 13.4
and 15 volts for the vehicle electrical system. It
supplies the ECM with DC current.
Vehicle 12-volt battery supplies the ECM with DC
current.
IGNITION SYSTEM
Double ignition coil has two separate windings,
one for each spark plug.
Ignition coil induces voltage to a high level in the
secondary windings to produce a spark at the
spark plug.
Two separate windings circuits are switched to
ground through the ECM. Each winding provides
high voltage to its corresponding spark plug.
This ignition system allows spark plugs to spark
independently.
CAUTION: Do not interchange spark plug ca-
bles. Match reference (PTO and MAG printed
on high tension cable yellow tag) with corre-
sponding cylinder spark plug.
Double ignition coil is located underneath multi
function plate.
A35C3SA
1
1. Ignition coil
AIR INDUCTION
Through air filter mounted LH side panel, air goes
into air silencer. The ECM measures at this point
air pressure and temperature. Then, air for com-
bustion is drawn through two throttle bodies. The
air flow is controlled by two throttle plates. The air
continues through the reed valves into the cylinder
base then the crankcase.
A35C3TA
1
THROTTLE BODY ASSEMBLY
1. Coolant-heated line
118 mmr2005-124
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