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차세대 알루미늄 피스톤의 신뢰성 검증을 위한 내구특성 평가
조일환(Ilhwan Jo),이형상(Hyungsang Lee),김희붕(Heuiboong Kim),장현모(Hyunmo Jang),김동연(Dongyeon Kim),김숭기(Soongkee Kim) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Each automobile company has their own process to validate durability characteristic of their own product. As customer has been focusing initial quality of vehicle, automobile companies try to improve their validation process and work up to enhance initial quality and durability. In case of engine development, engine must be validated its durability characteristic at max load and max power condition, speed transient condition, hot & cold condition and each engine's specific running condition. In this study, after increasing combustion pressure up to 180 bar, initial durability validation cycle which is consisted of high load & high power condition, city cycle condition and vehicle simulation cycle condition was applied for verifying next generation aluminum piston durability characteristic.
대형 디젤 엔진 후처리 Plasma/Oxidation Catalyst/DPF 시스템의 재생 성능에 관한 연구
서형만(Hyongman Seo),이재욱(Jeawook Lee),이형상(Hyungsang Lee),전광민(Kwang Min Chun) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Oxidation catalyst and plasma assisted oxidation catalyst were tested about its ability to regenerate diesel particulate filter system in a heavy duty diesel engine at the engine speed of 1260rpm. The gaseous emissions and the back pressure were measured to investigate the NO/NO₂ conversion and to determine DPF regeneration in the tests. NO/NO₂ conversion with oxidation catalyst began at 220℃ and increased up to 300℃ with the maximum conversion efficiency of 60%. And by assisting the oxidation catalyst with plasma reaction, the NO/NO₂ conversion increased about 10% and resulted in the improvement of DPF regeneration speed.
소형디젤엔진에서 Venturi와 Throttle을 이용한 흡기개선이 EGR률과 배출가스에 미치는 영향
김태규(Taekyu Kim),하창현(Changhyun Ha),이형상(Hyungsang Lee),이재욱(Jaewook Lee),전광민(Kwangmin Chun) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
EGR system is currently being used for many diesel engines to reduce NOx emissions with unwanted PM emission and fuel consumption increase. EGR control systems are required to provide higher EGR rates and proper A/F ratios in other to achieve their NOx reduction targets while minimizing PM and fuel economy penalty. In this study, Venturi system and throttle control of intake air were tested to improve EGR rates and DeNOx Efficiency. From the tests, intake throttle was proved to have the ability of EGR increase and NOx reduction.<br/>