Method and apparatus for generating display waveforms im wasted spark ignition systems
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United States of America Patent
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-
Nov 26, 1991
Issued Date -
N/A
app pub date -
Oct 11, 1988
filing date -
Mar 17, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A method and apparatus of developing a stabilized power firing event signal for a cylinder in a wasted spark ignition system having pairs of complementarily connected cylinders, each with a spark plug connected to an opposite end of an independent ignition coil. The first and second firing event signals are developed for each spark plug upon firing of the ignition coil. The first and second signals are combined with like polarity in a summation circuit for eliminating common mode signal portions. The combined signal, which is now stabilized and accurately indicates spark duration, is used for capturing secondary ignition data and may be visually displayed for analysis.
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