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:
Dec. 09, 2014
Filed:
Apr. 19, 2013
Kabushiki Kaisha Toyota Chuo Kenkyusho, Nagakute-shi, Aichi-ken, JP;
Hiroshi Miyagawa, Nagakute, JP;
Kiyoshi Yamazaki, Toyota, JP;
Kabushiki Kaisha Toyota Chuo Kenkyusho, Nagakute-shi, JP;
Abstract
The internal combustion engine has an upstream side NOselective reduction catalyst and a downstream side NOselective reduction catalyst which are arranged in an engine exhaust passage. The upstream side NOselective reduction catalyst has a region where the NOremoval rate becomes substantially constant when the ratio of concentration of ammonia to NOof the inflowing exhaust rises. The internal combustion engine has an operating state in that region where the ratio of concentration of ammonia to NOis maintained. The downstream side NOselective reduction catalyst has an ammonia oxidation ability which is larger than the upstream side NOselective reduction catalyst.