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:
Mar. 08, 2016
Filed:
Feb. 21, 2014
Akihiro Katayama, Toyota, JP;
Kazuhiro Akisada, Toyota, JP;
Leuth Insixiengmai, Nagoya, JP;
Sei Maruta, Toyota, JP;
Shinichi Nakagoshi, Nisshin, JP;
Masahide Okada, Anjou, JP;
Akihiro Katayama, Toyota, JP;
Kazuhiro Akisada, Toyota, JP;
Leuth Insixiengmai, Nagoya, JP;
Sei Maruta, Toyota, JP;
Shinichi Nakagoshi, Nisshin, JP;
Masahide Okada, Anjou, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
An apparatus for detecting imbalance abnormality in an air-fuel ratio between cylinders in a multi-cylinder internal combustion engine is disclosed. The apparatus includes an imbalance determining unit programmed to determine imbalance in an air-fuel ratio of a first cylinder belonging to a cylinder group based upon a difference value between an index value correlative with a crank angular speed detected in the first cylinder and an index value correlative with a crank angular speed detected in a second cylinder belonging to another cylinder group, and further a correction unit programmed to correct the difference value for the first cylinder based upon the index value detected in at least one of other cylinders belonging to the same cylinder group as that of the first cylinder.