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:
Aug. 04, 2015
Filed:
Oct. 02, 2013
Yoshihisa Oda, Toyota, JP;
Isao Nakajima, Nisshin, JP;
Masashi Hakariya, Nagoya, JP;
Akihiro Katayama, Toyota, JP;
Kazuhiro Akisada, Toyota, JP;
Sei Maruta, Toyota, JP;
Leuth Insixiengmai, Nagoya, JP;
Shinichi Nakagoshi, Nisshin, JP;
Masahide Okada, Anjo, JP;
Yoshihisa Oda, Toyota, JP;
Isao Nakajima, Nisshin, JP;
Masashi Hakariya, Nagoya, JP;
Akihiro Katayama, Toyota, JP;
Kazuhiro Akisada, Toyota, JP;
Sei Maruta, Toyota, JP;
Leuth Insixiengmai, Nagoya, JP;
Shinichi Nakagoshi, Nisshin, JP;
Masahide Okada, Anjo, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota-shi, JP;
Abstract
An inter-cylinder air-fuel ratio variation abnormality detection apparatus is disclosed. The apparatus determines imbalance of an air-fuel ratio among the cylinders based on a difference between index values correlated with crank angular velocities detected in a set of opposite cylinders belonging to different banks and having crank angles different from one another by 360°; and carries out an air-fuel ratio feedback process for controlling an amount of injected fuel for each of the banks, wherein the apparatus comprises a correction unit correcting, before determining the air-fuel ratio imbalance, the difference between the index values in a direction of combustion improvement for opposite cylinders that are opposite to cylinders belonging to a bank identical to a bank of a cylinder with the most deviating index value from a standard value among all the cylinders and being other than the cylinder with the most deviating index value.