AIR-FUEL RATIO DETECTION DEVICE AND AIR-FUEL RATIO DETECTION METHOD

Title:

AIR-FUEL RATIO DETECTION DEVICE AND AIR-FUEL RATIO DETECTION METHOD

Document Type and Number:

WIPO Patent Application WO/2013/076842

Kind Code:

A1

Abstract:

In air-fuel ratio detection for: detecting the output of a downstream sensor (10), which is a limiting-current air-fuel ratio sensor arranged further downstream than a catalyst (6) on an exhaust route (4) of an internal combustion engine (2); and calculating the air-fuel ratio of exhaust gas downstream of the catalyst (6) in accordance with the output of the downstream sensor (10); the relationship between the output of the downstream sensor (10) and an air-fuel ratio calculated by a calculating means, when the output of the downstream sensor (10) is in a predetermined range that includes output corresponding to a theoretical air-fuel ratio, is shifted more to the rich side than the correspondence relationship between the air-fuel ratio and the output of an upstream sensor (10), which is a similar sensor to the downstream sensor (10), arranged further upstream than the catalyst on the exhaust route (4) of the internal combustion engine (2).

Inventors:

AOKI KEIICHIRO (JP)

Application Number:

PCT/JP2011/077054

Publication Date:

May 30, 2013

Filing Date:

November 24, 2011

Export Citation:

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Assignee:

TOYOTA MOTOR CO LTD (JP)
AOKI KEIICHIRO (JP)

International Classes:

F02D41/14; F01N3/24; F02D41/20; F02D43/00; F02D45/00; F02M17/08; G01N27/04; G01N27/416

Foreign References:

JP2009024613A	2009-02-05
JP2001234789A	2001-08-31
JP2008014670A	2008-01-24
JP2007232709A	2007-09-13
JP2006291893A	2006-10-26
JP2005248914A	2005-09-15
JP2006291893A	2006-10-26
JP2006002579A	2006-01-05
JP2003097334A	2003-04-03
JPH1193744A	1999-04-06
JP2006010583A	2006-01-12

Other References: