Title:
AIR-FUEL RATIO CONTROL DEVICE FOR INTERNAL COMBUSTION ENGINE
Document Type and Number:
WIPO Patent Application WO/2011/148517
Kind Code:
A1
Abstract:
Disclosed is an air-fuel ratio control device which controls the air-fuel ratio of an air-fuel mixture to be supplied to an engine (the air-fuel ratio in the engine) on the basis of the output value of a downstream-side air-fuel ratio sensor disposed downstream from a catalyst. More specifically, when the output value (Voxs) is smaller than a target value (VREF) (when a rich request is generated), the air-fuel ratio control device sets the air-fuel ratio in the engine to a rich air-fuel ratio. When the output value (Voxs) is larger than the target value (VREF) (when a lean request is generated), the air-fuel ratio control device sets the air-fuel ratio in the engine to a lean air-fuel ratio. When the output value (Voxs) significantly differs from a reference value (Vf) (theoretical air-fuel ratio-equivalent value), the air-fuel ratio control device gradually brings the target value (VREF) close to the reference value (Vf) from a predetermined value (point P1 - point P3).
Inventors:
TOMIMATSU MAKOTO (JP)
ONOE RYOTA (JP)
FUJIWARA TAKAHIKO (JP)
ONOE RYOTA (JP)
FUJIWARA TAKAHIKO (JP)
Application Number:
PCT/JP2010/059486
Publication Date:
December 01, 2011
Filing Date:
May 28, 2010
Export Citation:
Assignee:
TOYOTA MOTOR CO LTD (JP)
TOMIMATSU MAKOTO (JP)
ONOE RYOTA (JP)
FUJIWARA TAKAHIKO (JP)
TOMIMATSU MAKOTO (JP)
ONOE RYOTA (JP)
FUJIWARA TAKAHIKO (JP)
International Classes:
F02D41/14
Foreign References:
| JPH05149172A | 1993-06-15 | |||
| JP2005171982A | 2005-06-30 | |||
| JPH08177576A | 1996-07-09 | |||
| JP2001304018A | 2001-10-31 | |||
| JP2009250163A | 2009-10-29 |
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: