The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 23, 1996
Filed:
May. 02, 1994
Applicant:
Inventors:
Jeffrey R Drexel, Rochester Hills, MI (US);
Larry T Nitz, Rochester, MI (US);
Assignee:
Saturn Corporation, Troy, MI (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
G01M / ;
U.S. Cl.
CPC ...
731173 ; 36443108 ;
Abstract
Internal combustion engine misfires are diagnosed through monitoring of change in engine speed wherein an acceleration spike index is generated for each cylinder event over a number of engine cycles in a test period and is corrected in accord with sensed part tolerancing, and wherein the corrected acceleration spike index is compared to at least one misfire threshold. For each engine cylinder, a degree of misfire severity is diagnosed at the end of the test period in accord with the frequency of excursions by the corresponding misfire index above the at least one misfire threshold.