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:
Oct. 09, 2018
Filed:
Jun. 01, 2016
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Yoshihiro Nakano, Komaki, JP;
Shiro Kakimoto, Kasugai, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A multi-gas sensor controlleris provided in an urea SCR systemwith an SCR catalyst, an aqueous urea injectorand a multi-gas sensor(ammonia sensor unit and NOx sensor unit). The multi-gas sensor controllerdetermines the concentration of ammonia in exhaust gas flowing out of the SCR catalyst, as a downstream ammonia concentration value, based on a detection result of the ammonia detection unit. The multi-gas sensor controllercontrols the aqueous urea injectorto supply urea to the SCR catalystin a fuel-cut state. Further, the multi-gas sensor controllercorrect the determined downstream ammonia concentration value based on a detection result of the NOx detection unit and an oxygen concentration of the exhaust gas after the supply of urea to the SCR catalyst with the control of the aqueous urea injectorby the controller