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Title:
CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2014/118892
Kind Code:
A1
Abstract:
　This control device for an internal combustion engine equipped with an exhaust purification catalyst (20), which is disposed in an exhaust passage of the internal combustion engine and capable of storing oxygen, includes: a downstream air-fuel ratio detection means that is disposed downstream of the exhaust purification catalyst in the exhaust flow direction; and an inflow air-fuel ratio control means that controls the air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst. If the outflow air-fuel ratio detected by the downstream air-fuel ratio detection means is equal to or less than a rich-determination air-fuel ratio, which is richer than the stoichiometric air-fuel ratio, the inflow air-fuel ratio control means sets the target air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst continuously or intermittently leaner than the stoichiometric air-fuel ratio until the oxygen storage amount of the exhaust purification catalyst reaches a prescribed storage amount. If the oxygen storage amount of the exhaust purification catalyst is equal to or greater than the prescribed storage amount, the inflow air-fuel ratio control means sets the target air-fuel ratio continuously or intermittently richer than the stoichiometric air-fuel ratio until the oxygen storage amount decreases toward zero without reaching the maximum oxygen storage amount.

Inventors:
OKAZAKI SHUNTARO (JP)
NAKAGAWA NORIHISA (JP)
YAMAGUCHI YUJI (JP)
Application Number:
PCT/JP2013/051911
Publication Date:
August 07, 2014
Filing Date:
January 29, 2013
Export Citation:
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Assignee:
TOYOTA MOTOR CO LTD (JP)
OKAZAKI SHUNTARO (JP)
NAKAGAWA NORIHISA (JP)
YAMAGUCHI YUJI (JP)
International Classes:
F02D41/14; G01N27/41
Domestic Patent References:
WO2012035622A12012-03-22
Foreign References:
JP2005127259A2005-05-19
JP2010236450A2010-10-21
JPH04204370A1992-07-24
JPH1082760A1998-03-31
JP2000039418A2000-02-08
JP2008095647A2008-04-24
JP2011069337A2011-04-07
JP2001234787A2001-08-31
JPH08232723A1996-09-10
JP2009162139A2009-07-23
Other References:
See also references of EP 2952715A4
Attorney, Agent or Firm:
AOKI, Atsushi et al. (JP)
Aoki 篤 (JP)
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