Ignition spark zone duration circuit

Details Ignition spark zone duration circuit Ignition spark zone duration circuit

1978-03-27

1979-07-31

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

307268, 328 34, 324181, F02P 1700

Patent

active

041631927

ABSTRACT:
A circuit for generating a clean square electrical pulse having a duration equal to the spark zone duration in an internal combustion engine includes a comparator connected to produce an output when the signal input thereto, coupled from the primary winding of the ignition coil, exceeds a predetermined high voltage at the reference voltage input of the comparator. A one-shot multivibrator triggered by the initial output of the comparator generates an output continuing beyond the duration of high voltage ringing in the signal from the ignition coil. A "nor" gate receptive to outputs from the comparator and the one-shot produces an output which reduces the reference voltage applied to the comparator to a value below the plateau of the signal from the ignition coil. The "nor" gate provides the desired output spark zone duration pulse.

REFERENCES:
patent: 2005111 (1935-06-01), Shore
patent: 2428011 (1947-09-01), Chatterjea et al.
patent: 3053996 (1962-09-01), Stefanov
patent: 3416080 (1968-12-01), Wright et al.
patent: 3551800 (1970-12-01), Widmer
patent: 3566283 (1971-02-01), Diebler
patent: 3714554 (1973-01-01), Benedix
patent: 3970872 (1976-07-01), Kuhn et al.

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