Engine analyser with constant width digital waveform display

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

G - Physics

01

L

354/24

G01L 3/26 (2006.01) F02P 17/08 (2006.01)

Patent

CA 1172759

ENGINE ANALYZER WITH CONSTANT WIDTH DIGITAL WAVEFORM DISPLAY ABSTRACT OF THE DISCLOSURE 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 memory. 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.

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