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:
Feb. 15, 1994
Filed:
Jun. 25, 1991
Ryuichiro Imai, Tokyo, JP;
Fuji Jukogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A misfire diagnosis apparatus for an internal combustion engine having a plurality of cylinders, comprising momentum change rate calculating device (M1), momentum change rate comparing device (M2), misfire judging device (M3) and average momentum change rate learning value setting device (M4). A momentum change rate calculated by the calculating device (M1) is compared with an average momentum change rate learning value by the comparing device (M2) in light of a learning value map (MMP.DELTA.N.sub.l) corresponding to the operating conditions of a pertinent cylinder. The result of the comparison is compared with a misfire judgement level by the judging device (M3) in light of a misfire judgement level map (MMP.DELTA.N.sub.LEVEL) corresponding to the operating conditions of the pertinent cylinder. The setting device (M4) sets and updates the learning value of the learning value map (MMP.DELTA.N.sub.l).
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