US Patent: 5,296,869 - Digital Engine Analyzer


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US Patent: 5,296,869

Digital Engine Analyzer

Patentees:

Gary D. Jonker (exact or similar names) - Kenosha, WI

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

Michael B. Meeker (exact or similar names) - Kenosha, WI

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

Michael C. Putrow (exact or similar names) - Racine, WI

John C. Sniegowski (exact or similar names) - Kenosha, WI

USPTO Classifications:

324/394, 345/24, 345/440.1, 345/440.2, 701/102, 73/117.3

Tool Categories:

Assignees:

Snap-On Tools Corp. - Kenosha, WI

Manufacturer:

Not known to have been produced

Witnesses:

none listed

Patent Dates:
Applied:	May 14, 1993
Granted:	Mar. 22, 1994

Patent Pictures:

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Snap-On Tools Company History

Description:

Emrich & Dithmar - patent attorneys

Abstract

A digital engine analyzer has an oscilloscope display and is controlled by microprocessors operating under menu-driven stored program control. The analyzer receives analog input signals from an engine being analyzed and calculates and display spark plug burn time information derived from a single analog input signal, the data being displayed in both numerical and bar graph form. The measured burn time is the time that the ignition voltage signal is above a predetermined threshold level which is greater than the amplitude of the ringing portion of the ignition voltage signal.