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Title:
CATALYST DETERIORATION DETECTION DEVICE
Document Type and Number:
Japanese Patent JP2008175118
Kind Code:
A
Abstract:

To provide a catalyst deterioration detection device capable of materializing robust catalyst deterioration detection control by coping with hydrogen and unburned HC giving bad influence on an exhaust gas sensor in an initial stage.

ECU 1 executing active deterioration detection control for detecting deterioration of a three-way catalyst 22 using output of an A/F sensor 23 and an oxygen sensor 24 in an internal combustion engine system 100 provided with an air current control valve 58 for improving a condition of combustion in the internal combustion engine 50, an A/F sensor 23 and an oxygen sensor 24 detecting oxygen in exhaust gas, and the three-way catalyst 22 purifying exhaust gas, is provided with a deterioration detection control permission means permitting execution of active deterioration detection control according to the degree of combustion improvement by the air current control valve 58. The deterioration detection control permission means permits execution of active deterioration detection control when a valve opening condition of the air current control valve 58 is half open.


Inventors:
HOSHI KOICHI
ITO YOSHIAKI
Application Number:
JP2007008612A
Publication Date:
July 31, 2008
Filing Date:
January 18, 2007
Export Citation:
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Assignee:
TOYOTA MOTOR CORP
International Classes:
F01N3/20; F01N3/24; F02B31/00; F02D43/00; F02D45/00
Domestic Patent References:
JPH08303280A1996-11-19
JP2005155422A2005-06-16
JP2005146900A2005-06-09
JPH0874583A1996-03-19
JPH03237216A1991-10-23
JP2003120266A2003-04-23
Foreign References:
WO2002070873A12002-09-12
Attorney, Agent or Firm:
Shuhei Katayama
Toshiyuki Hatta
High Yoshitaka Hayashi



 
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