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:
Apr. 25, 2006
Filed:
Feb. 02, 2004
Shuntaro Okazaki, Susono, JP;
Noriyasu Adachi, Numazu, JP;
Naoto Kato, Susono, JP;
Toshinari Nagai, Sunto-gun, JP;
Yasuhiro Oi, Numazu, JP;
Daisuke Kobayashi, Toyota, JP;
Akira Ohata, Mishima, JP;
Koji Ide, Toyota, JP;
Shuntaro Okazaki, Susono, JP;
Noriyasu Adachi, Numazu, JP;
Naoto Kato, Susono, JP;
Toshinari Nagai, Sunto-gun, JP;
Yasuhiro Oi, Numazu, JP;
Daisuke Kobayashi, Toyota, JP;
Akira Ohata, Mishima, JP;
Koji Ide, Toyota, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
An exhaust purification apparatus for an internal combustion engine includes a catalyst unit disposed in an exhaust passage of the engine, upstream and downstream air-fuel-ratio sensors disposed upstream and downstream, respectively, of the catalyst unit, a main-feedback controller, and a sub-feedback controller. The main-feedback controller calculates a main-feedback control quantity on the basis of an output value of the upstream air-fuel-ratio sensor and a predetermined upstream-side target value, and corrects, on the basis of the main-feedback control quantity, the quantity of fuel injected by an fuel injector. The sub-feedback controller calculates a sub-feedback control quantity on the basis of an output value of the downstream air-fuel-ratio sensor and a predetermined downstream-side target value, and corrects, on the basis of the sub-feedback control quantity, the quantity of fuel injected by the fuel injector, independently of the correction of the fuel injection quantity by the main-feedback control means.