Ignition system with ignition current and minimum spark duration

Internal-combustion engines – High tension ignition system – Current or voltage sensing in coil primary

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123440, 315209T, F02P 304

Patent

active

042313481

ABSTRACT:
To prevent misfires, the current through an ignition coil is increased in response to an error signal indicating that the actual spark duration was less than a predetermined minimum spark duration. At the start of the spark, a capacitor is discharged at a known rate. The time required for the voltage across the capacitor to reach a predetermined level is the desired spark duration. This regulation of ignition current causes the spark duration to be very close to the minimum spark duration, thereby cutting losses in the apparatus.

REFERENCES:
patent: 4008696 (1977-02-01), Gartner
patent: 4106447 (1978-08-01), West
patent: 4153032 (1979-05-01), Chateau

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