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Cooled EGR이 직접분사 DME엔진의 배기특성에 미치는 영향
남상훈(Sanghoon Nam),김영길(Yongkil Kim),이영재(Yongjae LEE) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
There are high expectations for DME(Dimethyl Ether) as a new alternative fuel for diesel engine. Compared with the conventional diesel engine, nearly zero soot emission and high thermal efficiency have been reported from DME fuelled Cl engines. However, higher NOx emission is one of the disadvantages from DME Engines. In the present study, cooled EGR(Exhaust Gas Recirculation) was applied to DME engine modified from conventional Dl diesel engine, and effects of EGR were examined under various EGR rate and EGR temperature. Finally, it was concluded that the cooled EGR is an effective solution to reduce NOx emission from DME engine.<br/>
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.