Title:
AMMONIA SENSOR ANOMALY DETERMINATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2020/075438
Kind Code:
A1
Abstract:
A controller (30) for an ammonia sensor in an exhaust purification system. The controller (30): calculates, in a continuation period in which ammonia supply to a downstream-side catalyst (22) is continued after a pause of supply of aqueous urea solution by an aqueous urea solution supply device (23), an ammonia concentration on the downstream side of the downstream-side catalyst (22) as a first concentration value on the basis of an output of the ammonia sensor and an output of an oxygen sensor; calculates, in the continuation period, an ammonia concentration on the downstream side of the catalyst as a second concentration value on the basis of an output of a NOx sensor and the output of the oxygen sensor; and determines, on the basis of the first concentration value and the second concentration value, whether there is anomaly in the ammonia sensor.
Inventors:
TAKIZAWA KENSUKE (JP)
HARADA TOSHIHIKO (JP)
ICHIKAWA HIROKI (JP)
HARADA TOSHIHIKO (JP)
ICHIKAWA HIROKI (JP)
Application Number:
PCT/JP2019/035763
Publication Date:
April 16, 2020
Filing Date:
September 11, 2019
Export Citation:
Assignee:
DENSO CORP (JP)
International Classes:
F01N3/18; B01D53/94; F01N3/00; F01N3/08; F01N11/00
Foreign References:
| JP2016223446A | 2016-12-28 | |||
| JPS6238564B2 | 1987-08-18 | |||
| JP2003328860A | 2003-11-19 | |||
| JP2008202425A | 2008-09-04 | |||
| JP2015215334A | 2015-12-03 | |||
| JP2017078584A | 2017-04-27 |
Attorney, Agent or Firm:
YAMADA, Tsuyoshi (JP)
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