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. 28, 2012
Filed:
Aug. 13, 2007
Takahiko Fujiwara, Susono, JP;
Norihisa Nakagawa, Numazu, JP;
Taiga Hagimoto, Susono, JP;
Junichi Kako, Susono, JP;
Naoto Kato, Susono, JP;
Shuntaro Okazaki, Susono, JP;
Koji Ide, Susono, JP;
Takahiko Fujiwara, Susono, JP;
Norihisa Nakagawa, Numazu, JP;
Taiga Hagimoto, Susono, JP;
Junichi Kako, Susono, JP;
Naoto Kato, Susono, JP;
Shuntaro Okazaki, Susono, JP;
Koji Ide, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Aichi, JP;
Abstract
An air-fuel ratio control system of a multi-cylinder internal combustion engine provided with a throttle valve and opening characteristic control means, which system performs feedback control of an air-fuel ratio based on an output of a sensor detecting an air-fuel ratio of exhaust gas and is capable of performing more accurate air-fuel ratio control, is provided. In the feedback control, the relationship of the output of the sensor and a feedback value is corrected based on a feedback learning correction value learned and determined based on the output of the sensor during the feedback control, and, when newly learning the feedback learning correction value, the intake air amount is controlled by only the throttle valve.