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. 08, 2013
Filed:
Mar. 31, 2009
Taiga Hagimoto, Susono, JP;
Daisuke Shibata, Numazu, JP;
Taiga Hagimoto, Susono, JP;
Daisuke Shibata, Numazu, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
The degree of deterioration of a catalyst is obtained accurately in cases where a plurality of catalysts is disposed at an exhaust passage of an internal combustion engine. Under the assumption that the degree of deterioration of a catalyst which is disposed at a location upstream of an NOselective reduction catalyst and has an oxidizing ability is at a predetermined value, the ratio of NOin the NOwhich inflows into the NOselective reduction catalyst is estimated; the NOremoval rate of the NOselective reduction catalyst is calculated a plurality of times at least until a local maximum value is obtained; and the degree of deterioration of the catalyst having an oxidizing ability is determined by comparison between the ratio of NOobserved when the NOremoval rate of the NOselective reduction catalyst reaches the local maximum value and a reference value of the ratio.