Title:
CATALYST DETERIORATION DEGREE ESTIMATION DEVICE
Document Type and Number:
WIPO Patent Application WO/2017/047678
Kind Code:
A1
Abstract:
This catalyst deterioration degree estimation device for an exhaust purification system provided with a NOx occlusion/reduction catalyst (32), and a NOx sensor (45) provided further downstream an exhaust passage than the NOx occlusion/reduction catalyst (32), is provided with: a calculation unit (120) which estimates, on the basis of the operation state of an internal combustion engine (10), the NOx amount included in exhaust that has passed through the NOx reduction catalyst (32), and calculates, on the basis of the difference between the estimated NOx amount and the actual NOx amount detected by the NOx sensor (45), the deterioration degree of the NOx occlusion/reduction catalyst (32); and a calculation control unit (121) which controls the calculation of the deterioration degree by the calculation unit (120) on the basis of the operation state of the internal combustion engine (10) and/or the state of the exhaust passage of the internal combustion engine (10).
Inventors:
NAKADA TERUO (JP)
SAKAMOTO TAKAYUKI (JP)
NAGAOKA DAIJI (JP)
SAKAMOTO TAKAYUKI (JP)
NAGAOKA DAIJI (JP)
Application Number:
PCT/JP2016/077205
Publication Date:
March 23, 2017
Filing Date:
September 15, 2016
Export Citation:
Assignee:
ISUZU MOTORS LTD (JP)
International Classes:
F01N3/20; B01D53/94; F01N3/08
Domestic Patent References:
| WO2015046273A1 | 2015-04-02 |
Foreign References:
| JP2009228680A | 2009-10-08 | |||
| JP2004270469A | 2004-09-30 | |||
| JP2002221028A | 2002-08-09 |
Attorney, Agent or Firm:
HIBIYA Yukihiko et al. (JP)
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