US Patent: 5,258,753 - Digital Engine Analyzer


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US Patent: 5,258,753

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:

324/379, 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:	Oct. 18, 1991
Granted:	Nov. 02, 1993

Patent Pictures:

USPTO (New site tip)
Google Patents
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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. The engine calculates and displays real-time cylinder time balance information by calculating for each cylinder the cylinder time period from the firing of that cylinder to the firing of the next cylinder, storing the cylinder time values for each cylinder for a number of successive engine cycles, averaging the time period values for each cylinder over that number of engine cycles, calculating an overall average of the cylinder averages, calculating the percentage difference between each cylinder average and the overall average and then displaying the percentage differences in both numerical and bar graph form along with the overall average value.