Ignition system for internal combustion engines
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United States of America Patent
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Dec 6, 1994
Issued Date -
N/A
app pub date -
Apr 15, 1994
filing date -
Aug 24, 1990
priority date (Note) -
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Abstract
The ignition system for a four-cycle gasoline engine having at least one cylinder includes a spark plug for each cylinder and an ignition coil for each spark plug so that each spark plug has its own ignition coil with a primary and secondary side as well as a control device for controlling the timing of the firing of the spark plugs via the individual ignition coils according to a predetermined firing sequence connected to each of the ignition coils. To satisfy strict requirements regarding exhaust emission by monitoring operation of the individual cylinders while avoiding additional sensors, the control device includes a circuit for analyzing and storing the ignition voltages on the primary side of each ignition coil measured at a number of different times for successive ignition events in each cylinder and a comparator device which compares the dependencies of the ignition voltage on time for two successive ignition events and a phase signal generating device which produces a phase signal from the results of the comparison of the ignition voltages mmade by the comparator device for control of the fuel injection and spark timing for each cylinder.
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