Spark advance tester

Details Spark advance tester Spark advance tester

1978-01-20

1979-03-27

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

F02P 1700

Patent

active

041468333

ABSTRACT:
This specification discloses a timing control circuit for a strobe lamp used in adjusting the ignition timing of an internal combustion engine. The control circuit includes an ignition firing detector with improved noise immunity, and a calibrated control for setting a strobe flash for a predetermined deviation from ignition firing. The output signal of the calibrated control is coupled to a first amplifier to determine the slope of a ramp voltage in part determining the flash point of the strobe lamp with respect to ignition firing. The output of the first amplifier is coupled to a second amplifier which generates a ramp voltage at the predetermined slope above a diode forward breakover voltage at the input to the second amplifier. The voltage drop across the diode, prevents false triggering by noise with a magnitude less than the diode voltage even when the maximum amplitude of the ramp voltage is near zero.

REFERENCES:
patent: 2785215 (1957-03-01), Yetter
patent: 3597677 (1971-08-01), MacCrea et al.
patent: 3665294 (1972-05-01), Pelta et al.
patent: 3820013 (1974-06-01), Gaudette, Jr. et al.
patent: 4008430 (1977-02-01), Blum
patent: 4039931 (1977-08-01), Schweizer
patent: 4095170 (1978-06-01), Schmitt

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