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밀러사이클을 이용한 대형 디젤엔진의 NOx 및 연료소비율 저감 연구
김기두(Kidoo Kim),김병석(Byongseok Kim),윤욱현(Wookhyeon Yoon) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Performance simulation has been carried out to enhance SFOC and NOx of a large diesel engine. Various intake valve closing times with higher compression ratio of turbocharger were evaluated by performance simulation to realize Miller cycle on a large diesel engine. Intake valve closing time 500, 510 and 630deg.ATDC were decided as test conditions to minimize NOx and SFOC. Engine tests were performed to validate simulation results and to find out the best intake valve closing time. Engine tests show that intensified early Miller cycle can improve SFOC and NOx at the same time. But extremely early and late Miller cycle deteriorate the engine starting and have higher smoke at low load over invisible limit. So intake valve closing time of 511deg.ATDC is selected in respect of SFOC, NOx and smoke on a large diesel engine