Title:
AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL-COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2010/134209
Kind Code:
A1
Abstract:
An air-fuel ratio control device is applied to an internal-combustion engine provided with a catalyst (43) in an exhaust passage, and is provided with a downstream-side air-fuel ratio sensor (56) that is a concentration cell-type oxygen concentration sensor disposed downstream from the catalyst, and an air-fuel ratio control means for controlling the air-fuel ratio of an air-fuel mixture to be supplied to an engine (10) such that the air-fuel ratio of gas flowing into the catalyst is changed on the basis of an output value of the downstream-side air-fuel ratio sensor. The air-fuel ratio control means controls the air-fuel ratio of the air-fuel mixture to be supplied to the engine (10) such that the air-fuel ratio of the gas flowing into the catalyst becomes an air-fuel ratio on the rich side from a theoretical air-fuel ratio when the output value of the downstream-side air-fuel ratio sensor is decreased and the air-fuel ratio of the gas flowing into the catalyst becomes an air-fuel ratio on the lean side from the theoretical air-fuel ratio when the output value of the downstream-side air-fuel ratio sensor is increased.
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Inventors:
NAKANO TOMOHIRO (JP)
FUJIWARA TAKAHIKO (JP)
FUJIWARA TAKAHIKO (JP)
Application Number:
PCT/JP2009/059729
Publication Date:
November 25, 2010
Filing Date:
May 21, 2009
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
NAKANO TOMOHIRO (JP)
FUJIWARA TAKAHIKO (JP)
NAKANO TOMOHIRO (JP)
FUJIWARA TAKAHIKO (JP)
International Classes:
F02D41/14; F01N3/24
Foreign References:
| JP2008095598A | 2008-04-24 | |||
| JP2006307704A | 2006-11-09 | |||
| JP2001304015A | 2001-10-31 | |||
| JP2008255964A | 2008-10-23 | |||
| JP2004084537A | 2004-03-18 | |||
| JP2005171982A | 2005-06-30 | |||
| JPH01172473A | 1989-07-07 | |||
| JP2000065782A | 2000-03-03 | |||
| JP2004069547A | 2004-03-04 |
Other References:
See also references of EP 2434134A4
Attorney, Agent or Firm:
PROSPEC PATENT FIRM (JP)
Patent business corporation Pros Peck patent firm (JP)
Patent business corporation Pros Peck patent firm (JP)
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Claims: