Title:
CATALYST DETERIORATION DETECTOR
Document Type and Number:
WIPO Patent Application WO/2007/145141
Kind Code:
A1
Abstract:
A catalyst deterioration detector not causing false detection of catalyst deterioration
by eliminating the influence of a variation of the state of the gas at the catalyst
outlet on the oxygen storage amount. Setting the lean target A/F to afL1 and the
rich target A/F to afR1, the maximum oxygen storage amount Cmax1 is calculated
(step 106). Next, setting the lean target A/F to afL2 and the rich target A/F to
afR2, the maximum oxygen storage amount Cmax2 is calculated (step 108). Lastly,
setting the lean target A/F to afL3 and the rich target A/F to afR3, the maximum
oxygen storage amount Cmax3 is calculated (step 110). If these all calculated
maximum oxygen storage amounts Cmax1, Cmax2, Cmax3 are less than a reference
value Cmaxth, catalyst deterioration is detected (step 116).
Inventors:
SAWADA HIROSHI (JP)
Application Number:
PCT/JP2007/061622
Publication Date:
December 21, 2007
Filing Date:
June 08, 2007
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
SAWADA HIROSHI (JP)
SAWADA HIROSHI (JP)
International Classes:
F01N3/20; B01D53/86; F01N3/24; F02D41/04; F02D45/00
Foreign References:
| JP2004044450A | 2004-02-12 | |||
| JP2005194981A | 2005-07-21 | |||
| JP2005009401A | 2005-01-13 | |||
| JP2004316459A | 2004-11-11 | |||
| JP2004245051A | 2004-09-02 |
Attorney, Agent or Firm:
TAKAHASHI, Hideki et al. (Takahashi & Partners5th Floor, Intec 88 Bldg.,20, Araki-cho, Shinjuku-ku, Tokyo 07, JP)
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