CATALYST DEGRADATION DIAGNOSTIC DEVICE

Title:

CATALYST DEGRADATION DIAGNOSTIC DEVICE

Document Type and Number:

Japanese Patent JP2009264184

Kind Code:

A

Abstract:

To prevent erroneous diagnosis caused by dispersion in air-fuel ratios between cylinders.

A device diagnoses degradation of a catalyst by measuring an oxygen storage capacity OSC of the catalyst arranged on an exhaust passage of a multi-cylinder internal combustion engine, and comparing a measurement value with a degradation determination value OSCs. The device detects a parameter (an imbalance ratio) relating to a degree of the variation in air-fuel ratios between cylinders, and corrects the measurement value of the oxygen storage capacity or a degradation determination value based on the detection value. A reduced value of the measurement value of the oxygen storage capacity caused by the air-fuel ratio variation is compensated to prevent the erroneous diagnosis that a normal catalyst is erroneously determined as degraded one.

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Inventors:

IWASAKI YASUSHI
KIDOKORO TORU
SAWADA YUTAKA
IMAMURA KEIJI
NAKAMURA FUMIHIKO

Application Number:

JP2008112779A

Publication Date:

November 12, 2009

Filing Date:

April 23, 2008

Export Citation:

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Assignee:

TOYOTA MOTOR CORP

International Classes:

F01N3/20; F01N3/24; F02D45/00

Domestic Patent References:

JP2008008158A	2008-01-17
JP2004019584A	2004-01-22
JP2005337194A	2005-12-08
JP2007321620A	2007-12-13
JP2002266682A	2002-09-18
JPH02230935A	1990-09-13

Attorney, Agent or Firm:

Yoshikazu Tani
Kazuo Abe

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