215 広域運転領域を対象としたデュアル酸素センサ式触媒劣化診断処理に関する考察(セッション8 事例紹介・管理運用II)

元データ 2006-11-29 一般社団法人日本機械学会

概要

The object of this study is to investigate an on-board diagnostic method to detect the deterioration of a three-way catalyst under actual vehicle operating conditions. For this purpose, we analyzed the signal waves generated by two oxygen sensors placed on upstream and downstream positions of the catalytic converter. Transient operation experiments were carried out using engine dynamometer system equipped with a fresh catalyst or an aged catalyst. The signal data of two oxygen sensors were processed by the fast Fourier transformation method. As a result, we found that the difference between the power spectrum of the upstream oxygen sensor signal and one of the downstream oxygen sensor signal, which was named the Δ Power, is effective index for the detection of deteriorated catalyst under acceleration conditions.

著者

山本 敏朗 独立行政法人交通安全環境研究所

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