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:
May. 03, 1994
Filed:
Oct. 22, 1991
Ryuichiro Imai, Musashino, JP;
Izuru Kawahira, Musashino, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A method of discriminating the misfire of a multicylinder engine for each cylinder (FIG. 1 A), comprising the steps of discriminating a cylinder number (#i) at a present combustion stroke (S101); calculating a present momentum at the present combustion stroke, in a period in which no combustive work is done (S105); computing a second momentum at a second stroke preceding the present combustion stroke two times, in a period in which no combustive work is done (S106); averaging the present and second momentums (S107); deriving a first momentum at a first stroke preceding the present combustion stroke one time, in a period in which no combustive work is done (S107); taking a difference between the averaged momentum and the first momentum (S107); setting a misfire judgement level from a map of combustion conditions in a function of said first momentum and engine load data (S108); and comparing the difference with the misfire judgement level (S109), thereby to judge the misfire condition for each cylinder without being affected by a manufactural allowance.
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