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:
Jan. 23, 2007
Filed:
May. 20, 2005
Akira Kamoto, Susono, JP;
Toshinari Nagai, Sunto-gun, JP;
Yosuhiro Oi, Numazu, JP;
Noriyasu Adachi, Susono, JP;
Koji Ide, Toyota, JP;
Daisuke Kobayashi, Susono, JP;
Shuntaro Okazaki, Susono, JP;
Naoto Kato, Susono, JP;
Takahiro Uchida, Susono, JP;
Akira Kamoto, Susono, JP;
Toshinari Nagai, Sunto-gun, JP;
Yosuhiro Oi, Numazu, JP;
Noriyasu Adachi, Susono, JP;
Koji Ide, Toyota, JP;
Daisuke Kobayashi, Susono, JP;
Shuntaro Okazaki, Susono, JP;
Naoto Kato, Susono, JP;
Takahiro Uchida, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
A catalyst degradation determining method includes the steps of: controlling an upstream-of-catalyst air-fuel ratio occurring upstream of a first catalyst to an air-fuel ratio that is rich of a stoichiometric air-fuel ratio so that first and second catalysts store oxygen up to a maximum storage amount of oxygen. The method then includes the steps of controlling the upstream-of-catalyst air-fuel ratio to a first lean air-fuel ratio until an output of a downstream-of-first-catalyst sensor indicates a lean air-fuel ratio, and then to a second lean air-fuel ratio and that has a value that is determined in accordance with an oxidizing-reducing capability index value, until a time point when an output of a downstream-of-second-catalyst air-fuel ratio sensor indicates an air-fuel ratio that is lean.