IEEJ Transactions on Industry Applications
Online ISSN : 1348-8163
Print ISSN : 0913-6339
ISSN-L : 0913-6339
Paper
Modeling and Deterioration Diagnosis of Catalyst for Automobile Exhaust Gas by On-Line Identification Method With Variable Forgetting Factor
Yasushi OkadaHiroyuki OkudaShuichi AdachiShinji NiwaMitsunobu KajitaniSeiji Hashimoto
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2006 Volume 126 Issue 12 Pages 1637-1644

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Abstract

The majority of the conventional system purifying exhaust gas is composed of a three-way catalyst and an electronic fuel injection. However, harmful pollutants are increasingly emitted when the catalyst becomes aged. Therefore, it is necessary to detect the deterioration of the catalyst by means of on board diagnosis. In this paper, we propose a diagnosis method of the aged catalyst using recursive system identification method with variable forgetting factor. We focus on the parameter of identified model which represents a characteristic of the catalyst, and possibility to describe the diagnosis of the aged catalyst.

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© 2006 by the Institute of Electrical Engineers of Japan
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