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. 08, 2017
Filed:
Jun. 07, 2010
Yasushi Iwazaki, Ebina, JP;
Hiroshi Miyamoto, Susono, JP;
Tatsuro Shimada, Toyota, JP;
Isao Nakajima, Toyota, JP;
Yoshihisa Oda, Toyota, JP;
Takuya Matsumoto, Nishikamo-gun, JP;
Masashi Hakariya, Nagoya, JP;
Yasushi Iwazaki, Ebina, JP;
Hiroshi Miyamoto, Susono, JP;
Tatsuro Shimada, Toyota, JP;
Isao Nakajima, Toyota, JP;
Yoshihisa Oda, Toyota, JP;
Takuya Matsumoto, Nishikamo-gun, JP;
Masashi Hakariya, Nagoya, JP;
TOYOTA JIDOSHA KABUSHIKI KAISHA, Toyota-shi, JP;
Abstract
A fuel injection amount control apparatus comprises an air-fuel ratio sensor disposed between an exhaust gas merging portion and an upstream catalyst. The control apparatus performs a feedback correction on an amount of fuel to be injected by the fuel injection valve so that an air-fuel ratio represented by the output value of the upstream air-fuel ratio sensor becomes equal to a target air-fuel ratio set at stoichiometric air-fuel ratio. The control apparatus obtains an air-fuel ratio imbalance indicating value, which becomes larger as a difference in air-fuel ratio of each of the mixtures supplied to each of the combustion chambers among the cylinders becomes larger, and performs an increasing correction to the instructed fuel injection amount in such a manner that an air-fuel ratio determined by the instructed fuel injection amount becomes richer than the stoichiometric air-fuel ratio as the obtained air-fuel ratio imbalance indicating value increases.