Electronic ignition system with modulated cylinder-to-cylinder timing
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United States of America Patent
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May 6, 1997
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N/A
app pub date -
Jul 8, 1994
filing date -
Jul 8, 1994
priority date (Note) -
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Abstract
An electronic ignition timing control system including a mechanism for retarding the ignition timing for all or a predetermined subset of the cylinders in a multi-cylinder internal combustion engine during cold starts. Spark timing is reduced for a balanced subset of the cylinders for a short time after the engine is started in order to transfer additional heat to the exhaust system to more quickly raise the temperature of the catalyst and thereby reduce undesired emissions.
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