Ignition system requirements and their application to the design of capacitor discharge ignition systems.

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Author
Williamson, Terrence Lyle.
Date
1971Advisor
Adler, R.W.
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Show full item recordAbstract
Kettering ignition systems used on the majority of automotive engines can
no longer assure reliable ignition for high-output engines. The capacitor discharge
ignition, CDI, is a promising system to supersede the obsolete battery-coil. This study examines wave-front requirements at the spark plug for producing
ignition in the internal combustion engine and system characteristics
necessary for producing the wave-front. Arc requirements are described and
used to define CDI parameters. A modified Kettering system which violates some basic ignition concepts
was replaced by a CDI system designed in this study. Its characteristics were
derived from arc requirements, not by aggrandizing the replaced battery-coil
parameters. During performance tests, the CDI system exhibited superior performance.
It fired simulated fouled plugs and continued to produce an arc when pressurized
tx) 3 times the value at which the Kettering ceased to function. This improved
performance was accomplished with approximately the same stored energy
and less input power.
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