Engine analyzer with constant width digital waveform display

Details Engine analyzer with constant width digital waveform display Engine analyzer with constant width digital waveform display

1981-12-04

1983-08-16

Krawczewicz, Stanley T.

Electricity: measuring and testing

Internal-combustion engine ignition system or device

With analysis of displayed waveform

731173, 324384, F02P 1700

Patent

active

043994075

ABSTRACT:
An engine analyzer for an internal combustion engine includes an analog-to-digital (A/D) converter which digitizes an analog electrical input waveform representing, for example, a secondary or primary voltage waveform of the ignition coil of the internal combustion engine. The digitized input waveform is stored in the form of digital data in a data mamory. Upon request by the operator of the apparatus, a microprocessor selects digital data stored, and supplies that digital data to a display, which displays a visual representation of the waveform based upon the selected digital data. The engine analyzer apparatus produces a constant width waveform regardless of engine RPM, by determining the period of the waveform to be stored, and then varying the sample rate at which the A/D converter samples the analog waveform and converts the sampled waveform to digital data. As a result, the number of data samples, and thus the width of the displayed waveform, is constant.

REFERENCES:
patent: 4254744 (1981-03-01), Mizote
patent: 4277830 (1981-07-01), Reid et al.
patent: 4301678 (1981-11-01), Full et al.

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