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Просмотр инструкции снегоходы Ski Doo MX Z 2005, страница 219
Section 05 ENGINE MANAGEMENT (POWER TEK)
Subsection 01 (OVERVIEW)
OPERATING PRINCIPLE
Power TEK
The acronym Power TEK refers to the following
technologies found on this engine:
Throttle position sensor
Electronic RAVE
Knock sensor
For this Power TEK 2-stroke engine, a TPS and a
knock sensor have been added to provide inputs
to the ECM. The engine is equipped with two
traditional TM carburetors coupled with the DPM
system (Digital Performance Management). The
ECM electronically controls the electric RAVE
valve solenoid and the DPM solenoid. This
achieves an improved fuel economy, a cleaner
engine for emission requirements and improved
engine protection (against seizure). The use of
a TPS along with the trigger coils (engine RPM)
allows the ECM to recognize the engine load and
thususing3DDPMandignitionmaps. TheECM
applies the proper ignition and DPM maps for
optimum engine operation in all riding conditions.
FUEL DELIVERY SYSTEM
Fuel Pump
The fuel pump is a conventional diaphragm type
that supplies fuel to the carburetors. Refer to FU-
EL SYSTEM
Carburetors and DPM System
The carburetors are calibrated with the richest jet-
ting required to fulfil the worse operating condi-
tions.
The DPM manifold receives negative pressure
created in the carburetor venturi. The DPM so-
lenoid opens the passage from the venturi to
decrease the pressure in the carburetor bowls
whichinturn,leanthefuelmixture.
Using predefined maps, the ECM is constantly ac-
tivating (duty cycle) the DPM solenoid to optimize
the air/fuel mixture.
The ECM receives the signals from different sen-
sors which indicate engine operating conditions at
millisecond intervals.
The engine RPM (through the trigger coils) and
TPS are the primary sensors used to control the
DPM. Other sensors (air pressure, air and coolant
temperature) are used as secondary inputs.
As air temperature and altitude change, the ECM
uses its 3D mapping to maintain the air/fuel mix-
ture at an optimum.
The ECM begins to lean fuel mixture when engine
RPM is above approximately 3500 RPM.
NOTE: For engine starting and warm-up, the re-
quired richer mixture is supplied by a conventional
choke (enricher type).
For more detailed informations regarding the car-
buretors and DPM manifold, refer to FUEL SYS-
TEM section.
ENGINE MANAGEMENT
SYSTEM (EMS)
The EMS (Engine Management System) is
equipped with an ECM. The ECM is responsible
for the following engine management/electrical
functions:
– power distribution
– ignition system
– e-RAVE valves
– DESS (Digitally Encoded Security System)
– start/stop functions
– RER(RotaxElectronicReverse)
– monitoring system
– diagnostic mode
– DPM system
The ECM is the central point of the engine man-
agement system. It reads the inputs, makes
computations, uses predetermined parameters
and sends the proper signals to the outputs for
proper engine management.
The ECM also stores the fault codes and gener-
al information such as: vehicle hours, serial num-
bers, customer and maintenance information.
The ECM features a permanent memory that will
keep the programmed tether cord cap(s) code,
fault codes and other vehicle information, even
when the battery is removed from the vehicle on
electric start models.
200 mmr2005-105
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