US Patent: 4,578,755 - Microprocessor Controlled Timing/Tachometer Apparatus


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US Patent: 4,578,755

Microprocessor Controlled Timing/Tachometer Apparatus

Patentees:

Robert O. Quinn (exact or similar names) - Kenosha, WI

Craig F. L. Govekar (exact or similar names) - Gurnee, IL

James R. Piehl (exact or similar names) - Kenosha, WI

USPTO Classifications:

324/391, 701/99, 702/147

Tool Categories:

Assignees:

Snap-On Tools Corp. - Kenosha, WI

Manufacturer:

Not known to have been produced

Witnesses:

none listed

Patent Dates:
Applied:	Nov. 12, 1982
Granted:	Mar. 25, 1986

Patent Pictures:

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Snap-On Tools Company History

Description:

Emrich & Dithmar - patent attorneys

Abstract

The apparatus comprises a combustion sensor to sense the combustion event in an engine, and a magnetic sensor to sense top dead center. Electrical signals from the sensors are converted to two trains of pulses which are applied to a microprocessor. Under the stored program, the microprocessor determines the time between pulses in one train and converts such time into engine speed in rpm. Also, the microprocessor determines degrees of rotation between corresponding pulses in the two trains. The offset angle, which is applied to a keyboard is subtracted from the degrees of rotation to provide the timing angle. The engine speed and timing angle appear in digital displays.