Sweep generator for engine analyzers

Details Sweep generator for engine analyzers Sweep generator for engine analyzers

1975-11-26

1977-03-01

Krawczewicz, Stanley T.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

307228, 328185, G01R 2900

Patent

active

040104150

ABSTRACT:
Method and apparatus for generating a sweep signal for the oscilloscope of an engine ignition analyzer, employing a lock loop with phase detector, integrator and voltage controlled oscillator. The oscillator provides a ramp voltage for use as a sweep signal. A feedback circuit provides a feedback signal to the input of the phase detector when the ramp voltage reaches a predetermined value for phase comparison with a reference signal related in time to an engine ignition event. The intetrator output controls the slope of the ramp voltage. When the two input signals to the phase detector are out of phase, the slope of the ramp voltage is changed via the integrator to reduce the phase difference. The ramp voltage provides a sweep signal of substantially constant length while the engine speed varies over the range of idling to full speed.

REFERENCES:
patent: 3499322 (1970-03-01), Pelta et al.
patent: 3577007 (1971-05-01), Cross
patent: 3603879 (1971-09-01), Pelta et al.
patent: 3617869 (1971-11-01), Germann et al.
patent: 3638107 (1972-01-01), Pelta et al.
patent: 3714499 (1973-06-01), Pelta et al.
patent: 3798965 (1974-03-01), Pelta et al.

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