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:
Mar. 13, 2012
Filed:
Apr. 09, 2008
Shunsuke Toshioka, Susono, JP;
Tomihisa Oda, Numazu, JP;
Takekazu Itoh, Toyota, JP;
Yutaka Tanai, Susono, JP;
Shunsuke Toshioka, Susono, JP;
Tomihisa Oda, Numazu, JP;
Takekazu Itoh, Toyota, JP;
Yutaka Tanai, Susono, JP;
Toyota Jidosha Kabushiki Kaisha, Toyota, JP;
Abstract
In an internal combustion engine, an NOselective reduction catalyst is arranged in the engine exhaust passage, and a urea aqueous solution feed valve is arranged in the engine exhaust passage upstream of the NOselective reduction catalyst. Based on the detections results of an NOpurification rate detecting means for detecting the NOpurification rate by the NOselective reduction catalyst, a urea aqueous solution feed amount detecting means for detecting the amount of feed of the urea aqueous solution, and a urea aqueous solution concentration detecting means for detecting the concentration of the urea aqueous solution, abnormalities in the NOselective reduction catalyst, urea aqueous solution feed system, and urea aqueous solution are judged.