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가변 밸브 타이밍(VVA) 기구를 이용한 차세대 연소방식의 연구
현기수(Gisoo Hyun),정찬승(Chansung Chung),두병만(Byungman Doo),구영곤(Younggon Ku) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
For this study, a Premixed Charged Compression Ignition (PCCI) Combustion was applied in a Heavy duty Diesel Engine, and has been experimentally investigated from the standpoint of its operating area extension to higher loads and engine performance, such like fuel consumption and emission, improvement. A Variable Valve Actuation (VVA) system was adopted to change the variables of intake and exhaust valve system such like opening, closing timing and valve lift profile. For controlling combustion timing which is a major difficulty for PCCI combustion engine realization, intake vale opening timing was advanced or retarded, and accordingly the effect of Miller cycle was evaluated. As a result, an ideal combustion can be achieved under controlling ignition timing and reducing effective compression ratio by using VVA system.
크랭크샤프트 벤딩 피로강도의 리그시험과 대상시험 상사법 개발
김종구(Jonggu Kim),김진수(Jinsoo Kim),김덕교(Dukkyo Kim),정찬승(Chansung Chung) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The objective of this research is to correlate the test condition between rig test and bench test. To correlate test condition, fatigue life test and stress measurement used in resonant fatigue machine has been conducted for 1bay crankshaft sample. Principal stress was also measured in the front side #1 cylinder pin filet of bench engine crankshaft with triaxil strain gauge. The result shows that fatigue limit of rig test and equivalent to gas pressure of bench test. This result can increase test duration efficiency and quantitative assessment of crankshaft fatigue strength.