Title:
ABNORMALITY DIAGNOSTIC APPARATUS FOR NOX SENSOR
Document Type and Number:
WIPO Patent Application WO/2010/134167
Kind Code:
A1
Abstract:
An abnormality diagnostic apparatus for an NOx sensor installed in the exhaust passage of an internal combustion engine. The exhaust passage comprises an upstream passage, a downstream passage, and an intermediate passage positioned therebetween. The abnormality diagnostic apparatus comprises a changeover valve changeable between a forward flow position where the upstream passage is connected to one end of the intermediate passage and the other end of the intermediate passage is connected to the downstream passage and a reverse flow position where the upstream passage is connected to the other end of the intermediate passage and one end of the intermediate passage is connected to the downstream passage. An NOx catalyst is installed on the upstream side of the intermediate passage and the NOx sensor is installed on the downstream side of the intermediate passage in the forward flow direction of exhaust gas when the changeover valve is set at the forward flow position. When the NOx sensor is diagnosed for abnormality, the changeover valve is changed to the reverse flow position.
Inventors:
ODA TOMIHISA (JP)
Application Number:
PCT/JP2009/059227
Publication Date:
November 25, 2010
Filing Date:
May 19, 2009
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
ODA TOMIHISA (JP)
ODA TOMIHISA (JP)
International Classes:
F01N3/00; F01N3/08; F01N3/24
Foreign References:
| JP2004124737A | 2004-04-22 | |||
| JP2008133780A | 2008-06-12 | |||
| JP2009046992A | 2009-03-05 | |||
| JP2004279418A | 2004-10-07 | |||
| JP2003120399A | 2003-04-23 | |||
| JP2008190383A | 2008-08-21 | |||
| JP2004270468A | 2004-09-30 |
Attorney, Agent or Firm:
TANI Yoshikazu et al. (JP)
Valley Yoshikazu (JP)
Valley Yoshikazu (JP)
Download PDF:
Claims: