Title:
濃度算出装置および濃度算出方法
Document Type and Number:
Japanese Patent JP6725320
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To improve detection accuracy of ammonia concentration after its correction.SOLUTION: A multi-gas sensor control device 9 [hereinafter called as a control device 9] in a urea SCR system 1 including an SCR catalyst 4, a urea water injector 5 and a multi-gas sensor 8 [ammonia detection part and NOx detection part] calculates a downstream ammonia concentration that is concentration of ammonia contained in exhaust gas discharged from the SCR catalyst 4 on the basis of a detection result of the ammonia detection part. Then, the control device 9 controls the urea water injector 5 so as to supply urea to SCR catalyst 4 when it is kept at fuel cut state. In addition, the control device 9 corrects the calculation result of downstream ammonia concentration on the basis of a detection result of the NOx detection part after urea is supplied to the SCR catalyst 4 under control of the urea water injector 5 performed by the control device 9 and a concentration of oxygen contained in the exhaust gas.SELECTED DRAWING: Figure 1
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Inventors:
Nakano Yoshihiro
Shiro Kakimoto
Shiro Kakimoto
Application Number:
JP2016102638A
Publication Date:
July 15, 2020
Filing Date:
May 23, 2016
Export Citation:
Assignee:
Nippon Special Ceramics Co., Ltd.
International Classes:
F01N3/08; B01D53/94; F01N3/00; F02D45/00
Domestic Patent References:
| JP2014224504A | ||||
| JP2011075546A | ||||
| JP2002266628A | ||||
| JP2015081602A | ||||
| JP2008057404A |
Attorney, Agent or Firm:
Nagoya International Patent Service Corporation