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
Ammonia occlusion amount estimation device and method, and purification control apparatus and method
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A purification controlleris configured to estimate the amount of ammonia occluded (i.e. ammonia occlusion amount) in an SCR catalyst, which is arranged in an exhaust pipeof a diesel engineso as to purify NOx in an exhaust gas of the diesel engine. More specifically, the purification controlleracquires upstream NO concentration data, upstream NOconcentration data, downstream NOx concentration data, downstream NOconcentration data and downstream ammonia concentration data. The purification controllerfurther acquires an urea injection amount. Then, the purification controllerestimates the ammonia occlusion amount based on the acquired upstream NO concentration data, upstream NOconcentration data, downstream NOx concentration data, downstream NOconcentration data and downstream ammonia concentration data, the acquired urea injection amount and reaction formulas for reduction of NOx with the SCR catalyst