Abstract
Abstract : This study was carried out to determine an optimal lean NO x trap (LNT) regeneration condition based on a NO x storage fraction. The LNT regeneration was performed by an in-cylinder post fuel injection method. A NO x storage fraction is defined by the ratio of current cumulated NO x amount in the LNT to the NO x storage capacity: 0 means empty and 1 fully loaded. In this study five engine operating conditions were chosen to represent the New European Driving Cycle. With various NO x storage fractions each engine operating condition, the LNT regeneration was executed and then NO x conversion efficiency, additional fuel consumption, CO and THC slip, peak catalyst temperature were measured. The results showed that there exist an optimal condition to regenerate the LNT, eg. 1500 rpm 6 bar BMEP with below 0.7 NO x storage fraction in this experimental constraint. Key words : Lean NO x trap(흡장형 NO x 촉매), In-cylinder post fuel injection(실린더 내 후 분사), NO x storage fraction(NO x 흡장률), NO
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