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김성준(S.J.Kim),류태우(T.U.Yu),김세원(S.W.Kim) 한국자동차공학회 1995 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1995 No.11_2
Monolithic three-way catalysts were aged with different mileages on an engine dynamometer. These catalysts were subsequently evaluated on an engine dynamometer to examine the effects of air/fuel ratio set point, temperature, and air/fuel ratio amplitude and frequency on the conversion efficiencies for NOx, CO, and HC. For this test, dual oxygen sensor method, which utilizes a comparison. between an upstream oxygen sensor and oxygen sensor placed downstream of the catalyst. is used under steady state operating conditions. It is found that the amplitude and frequency of air/fuel ratio closed-loop control system affects the NOx. CO, and HC conversion efficiencies greatly. In this study, a new parameter which can be used as a measure of catalyst performance is proposed, and it is found that this parameter qualitatively matches well with the HC conversion efficiency of catalyst.<br/>