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. 10, 2019
Filed:
Oct. 19, 2017
Ngk Spark Plug Co., Ltd., Nagoya-shi, Aichi, JP;
Yoshihiro Nakano, Komaki, JP;
Yoshinori Hibino, Kasugai, JP;
NGK SPARK PLUG CO., LTD., Aichi, JP;
Abstract
A concentration calculation apparatus, system and method which can compute a correction value for correcting an ammonia sensor output at a timing other than the time of fuel cut. A multi-gas sensor control apparatus () of a urea SCR system () begins recording (storing) a downstream NOx output value Sn and downstream ammonia output value Sa detected by a multi-gas sensor () (S) when the control apparatus determines that a DPF regeneration process is currently being performed (an affirmative determination in S). The apparatus () computes a downstream ammonia converted value Ca using a peak value of the downstream NOx output value Sn (S), and calculates a Gain correction coefficient based on a comparison of the downstream converted value Ca and the output value Sa (S). As a result, the Gain correction coefficient can be computed in accordance with the state of the ammonia detection section ().