Experimental Evaluation of EGR and Fuel Injection Pressure on Combustion, Size-resolved Nano-particle and NOx Emissions Characteristics in an Advanced Light-duty Diesel Engine

Abstract : In order to satisfy stringent future emission regulation in diesel engines, systematic approaches to mitigate the harmful exhaust emissions were developed, such as engine hardware, fuel injection equipment, engine control, and after-treatment system. In this study, to improve the nano-particle and NOx emissions from a state-of-the-arts diesel engine, effect of various EGR and fuel injection pressure with combustion analysis were evaluated. Size-resolved nano-particle and NOx emissions showed trade-off characteristics with various EGR rate and increment of fuel injection pressure. Key words :EGR(배기재순환), NOx(질소산화물), Nano-particle(입자상물질), Fuel injection pressure(연료분사압력), Diesel engine(디젤엔진) Nomenclature 1) IMEP : indicated mean effective pressure, barBMEP : brake mean effective pressure, barMBF : mass burned fraction, % 1. 서 론 자동차에서 배출되는 배기가스는 대기오염의 주요한 원인으로써, 세계적으로 자동차에서 배출되는 배기가스 규제를 점점 강화하는 추세이다. 자동차에서 배출되는 질소 산화물 및 입자상 물질은 중추 신경 및 호흡기를 자극하고 산성비 및 대기 중에서 * Corresponding author, E-mail: spark@korea.ac.kr