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커몬레일 연료분사장치를 이용한 DME DI기관의 니들리프트와 파일럿분사율이 엔진성능에 미치는 영향
양세문(Semoon Yang),이영재(Youngjae Lee),나형규(Hyungkyu Na),김영길(Yongkil Kim) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
DME seems to be one of the most attractive fuels for heavy-duty engines. Formerly, as for<br/> DME engines several R&D have been performed. However, a lot of technical problems<br/> which ought to be solved have been remained. The first problem is surely finding out the<br/> solution concerning safety fuel supply systems that are able to suppress vaporizations.<br/> Solving the first problem, we have tried to research for optimizations with regard to<br/> relationships between performances and emission characteristics using Common Rail<br/> Injection Systems.<br/> Experimental results are as follows,<br/> 1) Confirming optimum injection timing to appear, its value is about 14degreeBTDC as for<br/> brake thermal efficiency and NOx emissions, 2) Confirming optimum pilot injection pressure<br/> to appear, its value is nearly 50MPa, as for brake thermal efficiency and NOx emissions, 3)<br/> Confirming optimum pilot injection rates to appear, which are aimed at reduction of NOx<br/> emission, its value is 10% as for brake thermal efficiency and NOx emissions, 4) Also<br/> confirmed on nozzle lift, its value is about 0.21mm.