Synchronization circuit for a coil-per-plug ignition system
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United States of America Patent
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Dec 2, 1997
Grant Date -
N/A
app pub date -
Aug 21, 1996
filing date -
Nov 3, 1994
priority date (Note) -
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Abstract
A circuit for providing a synchronizing signal based on detected ignition voltages in a coil-per-plug ignition system. In this type of ignition system, each spark plug has its own step-up transformer, typically packaged in close proximity to the spark plug itself. Normally, the plugs are fired individually to extend plug life, but according to this invention, at least two of the plugs are fired concurrently during engine cranking. During such operation, the circuit senses the voltages at the primary transformer windings of two different spark plugs to identify the respective spark plug firings, and the synchronizing signal is produced based on the sequence of the identified firings.
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