고속 NO 분석기를 이용한 SI 엔진에서의 사이클 변동에 따른 NO 배출에 관한 분석

The NO emissions at the exhaust manifold were investigated with a fast NO analyzer to investigate the cycleby-cycle variations on NO emissions level and the dependence of NO emissions on combustion. The measurement was performed with a part load condition with respect to the mixture ratios and the changes in loads at 1800rpm. The averaged values were obtained during 200 cycles. We found that there is characteristic pattern in NO emissions from exhaust port and it was possible to set a representative value with the data sampled during specific period. As the load increased, the characteristics of NO emissions were more dependent on combustion pressures. It was also analyzed that the correlation between combustion pressures and NO emisions different equivalence ratios tends to increase as the mixture goes leaner. Furthermore, this correlation for the lean mixture near the lean limit seemed to be kept.