74
LAUNCH
X-431 PAD V
User's Manual
Fig. 7-39
7.4 Ignition (Optional)
The ignition system is the system which has greatest impact on
the performances of gasoline engine, as the statistical data shows
that nearly half of the failures are caused by poor work of electrical
system. And the performance tests of engine often start from the
ignition system. Nowadays ignition system includes distributor and
distributorless. Distributorless includes independent ignition and
simultaneous ignition.
1. Distributor ignition system i.e. contact breaker with contact-
controlled ignition system (commonly known as the platinum)
and contact breaker with noncontact-controlled ignition system
combined with magnet, hall components or infrared.
2. Independent ignition system: crankshaft sensor send out the
ignition timing signal and cylinder identification signal so that the
ignition system can send out ignition signal to specified cylinder in
specified time, each cylinder has its independent ignition coil.
3. Simultaneous ignition system: two cylinders share one ignition
coil, when two cylinder pistons reach top dead center at the same
time (one is compression, another is the exhaust), two spark plugs
will be ignited at the same time, at this time, the ignition for the
former cylinder is in high-pressure low temperature gas mixture,
the ignition is valid, while for the latter one is in low-pressure high
temperature exhaust gas, the ignition is invalid.
Maximus 3.0 can test and analyze the secondary signal for various
engine ignition systems.
The Ignition module utilizes the same hardware device as the Scope
module.
7.4.1 Secondary-distributor ignition analysis
The following connection should be made before performing it: