Title:
排気浄化機器の異常診断装置
Document Type and Number:
Japanese Patent JP4618350
Kind Code:
B2
Abstract:
A malfunction diagnostic device for an exhaust gas control device is provided. The malfunction diagnostic device includes a malfunction determination unit that determines an exhaust gas control device provided in an exhaust system of an internal combustion engine malfunctions when a parameter that indicates exhaust gas purification performance of the exhaust gas control device crosses a threshold. A deterioration determination unit determines the degree of deterioration of the exhaust gas control device. A variable threshold setting unit variably sets the threshold based on the degree of deterioration of the exhaust gas control device in such a manner that the likelihood that the exhaust gas control device is determined to be malfunctioning is lower at lower degrees of deterioration of the exhaust gas control device.
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Inventors:
Kenichiro Kawase
Application Number:
JP2008211619A
Publication Date:
January 26, 2011
Filing Date:
August 20, 2008
Export Citation:
Assignee:
TOYOTA JIDOSHA KABUSHIKI KAISHA
International Classes:
F01N3/18; B01D53/86; F01N3/02; F01N3/20
Domestic Patent References:
| JP62035009A | ||||
| JP2003155920A |
Attorney, Agent or Firm:
Hironobu Onda
Makoto Onda
Makoto Onda