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:
Jun. 29, 1993
Filed:
Feb. 20, 1992
Applicant:
Inventor:
Ryuichiro Imai, Musashino, JP;
Assignee:
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G01M / ;
U.S. Cl.
CPC ...
731173 ;
Abstract
A period when the combustion of an engine is not performed is detected at two points before and after the top dead center of the cylinder in the expansion stroke. Engine speeds in both the periods are detected and the speed difference between the detected periods is calculated. Mean speed difference is calculated. The mean speed difference is compared with a predetermined limit value, thereby estimating combustion condition of the cylinder.