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X431 GDS Scopebox Manual
4 Automotive Ignition waveform
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
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