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:
Nov. 18, 2014
Filed:
Mar. 28, 2011
Shota Kitano, Toyota, JP;
Hitoshi Tanaka, Nisshin, JP;
Isao Nakajima, Toyota, JP;
Yoshihisa Oda, Toyota, JP;
Masashi Hakariya, Nagoya, JP;
Kiyotaka Kushihama, Nagoya, JP;
Kazuyuki Noda, Toyota, JP;
Akihiro Katayama, Toyota, JP;
Yuichi Kohara, Toyota, JP;
Katsumi Adachi, Toyota, JP;
Shota Kitano, Toyota, JP;
Hitoshi Tanaka, Nisshin, JP;
Isao Nakajima, Toyota, JP;
Yoshihisa Oda, Toyota, JP;
Masashi Hakariya, Nagoya, JP;
Kiyotaka Kushihama, Nagoya, JP;
Kazuyuki Noda, Toyota, JP;
Akihiro Katayama, Toyota, JP;
Yuichi Kohara, Toyota, JP;
Katsumi Adachi, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi-ken, JP;
Abstract
An apparatus for detecting imbalance abnormality in an air-fuel ratio between cylinders in a multi-cylinder internal combustion engine according to the present invention increases a fuel injection quantity to a predetermined target cylinder to detect imbalance abnormality in an air-fuel ratio between cylinders at least based upon a rotation variation of the target cylinder after increasing the fuel injection quantity. The increase in the fuel injection quantity is carried out in the middle of performing the post-fuel-cut rich control. Since timing of the post-fuel cut rich control is used to increase the fuel injection quantity, the exhaust emission deterioration due to abnormality detection execution can be prevented as much as possible.