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Engine distributors DSG-423 User Manual

Engine distributors DSG-423
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DSG-423 IGNITION SYSTEM
03-3
Operation
With this system, the GCP monitors the engine speed
and operating temperature and decides what degree of
spark advance is correct for all of the operating
conditions. Because timing is set for life inherently in the
design of the engine, and there are no moving parts in
the ignition system itself, no maintenance is required
except for periodic spark plug checks. The system
provides for fixed spark advance at start-up, for cold
weather starting, and for “average value” default
settings in case of component failure. Particular
attention has been given to spark optimization for
excellent fuel economy in the warm-up mode.
The spark plugs are paired so that one plug fires during
the compression stroke and its companion plug fires
during the exhaust stroke. The next time that coil is
fired, the plug that was on exhaust will be on
compression, and the one that was on compression will
be on exhaust. The spark in the exhaust cylinder is
wasted (referred to as the “waste spark”) but little of the
coil energy is lost.
Engine Speed and Crankshaft Position
The crankshaft position and speed information comes
to the GCP from the Crankshaft Position (CKP) Sensor,
mounted near the crankshaft pulley. The CKP Sensor is
triggered by teeth on a trigger wheel located on the
crankshaft pulley. The pulse frequency indicates
crankshaft speed and a missing tooth indicates
crankshaft position.
Engine Temperature
The Engine Coolant Temperature (ECT) Sensor sends
engine temperature information to the GCP. It is located
in the rear coolant outlet pipe.
Fuel Octane Level Adjustment
In the event that the engine is operated on dry fuels
such as natural gas, compressed natural gas (CNG), or
liquefied petroleum gas (LGP), timing can be modified
by GCP “Fuel Type”.
Ignition Coil Driver
The GCP switches 4 individual ignition coils on and off
at the correct times to give the desired spark advance.
Ignition timing is adjusted constantly by the GCP. Many
factors including all the sensor inputs, affect the final
ignition setting.
Run Mode
The GCP interprets engine speed above 200 rpm as
Run Mode. The Base Spark advance (BSA) is
calculated by the GCP processing the engine speed
input.
Transient Mode
This function is to provide detonation protection when
the engine load is increased rapidly by fast opening of
the throttle plate.
Overspeed Mode
If the engine speed exceeds 4000 rpm the dwell will be
reduced until the speed drops below 4000 rpm.
Compression Stroke Exhaust Stroke

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Engine distributors DSG-423 Specifications

General IconGeneral
BrandEngine distributors
ModelDSG-423
CategoryEngine
LanguageEnglish

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