Engine diagnostic apparatus

Details Engine diagnostic apparatus Engine diagnostic apparatus

1975-07-30

1977-02-15

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01R 2900

Patent

active

040084345

ABSTRACT:
An engine analyzer in which testing apparatus is controlled in accordance with a signal generated from voltage pulses applied to the spark plugs, the signal being converted into a square wave voltage of a frequency corresponding to the frequency of occurrence of the ignition voltage pulses. Specifically, this is accomplished by producing a first square wave voltage of one-half the frequency of occurrence of the pulses, integrating this square wave voltage to form a first triangular wave voltage of the same frequency, inverting portions of this first triangular wave voltage to form a triangular wave voltage of the same frequency as the frequency of occurrence of the pulses and differentiating this further triangular wave voltage to form a square wave voltage of the frequency of occurrence of the pulses. The testing effect is initiated at the end of each first half cycle of the final square wave voltage so that the testing operation is initiated at a time intermediate the times at which successive voltage pulses occur.

REFERENCES:
patent: 3650149 (1972-03-01), Howes
patent: 3714499 (1973-01-01), Pelta et al.

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