Joseph D Orndorff

US Patent:

51516543, Sep 29, 1992

Filed:

Jul 6, 1988

Appl. No.:

7/215642

Inventors:

Stanley J. Krzywicki - Olney MD
Timothy S. Gibson - Columbia MD
Joseph D. Orndorff - Baltimore MD

Assignee:

Systems Control, Inc. - Sunnyvale CA

International Classification:

G01P 342
G01P 348
G01P 354

US Classification:

324160

Abstract:

A tachometer system for an internal combustion engine. The tachometer system uses one of two electromagnetic pulse sensing means to detect an electromagnetic signal produced by a firing of the engine. The sensing device may be an antenna or an inductive pickup. One of the signals is chosen and processed. A parameter indicative of pulse timing in the output signal is determined. This parameter is most advantageously a time between different ones of the output signals. The parameter is then converted into a value indicative of revolutions per unit time of the engine. The converting structure is advantageously formed by a personal computer.