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[가솔린엔진부문] 잔류가스 추정 기법을 이용한 EGR율의 예측
김성철(Sungcheol Kim),이상진(SangJin Lee),김득상(Duksang Kim),엄인용(Inyong Ohm),조용석(Yong-Seok Cho) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.11_1
Residual gas acts as a diluent which results in reducing the in-cylinder temperature as well as the flame speed, significantly affecting fuel economy, NOx emissions and combustion stability. Therefore it is important to determine the residual gas fraction as a function of the engine operating parameters accurately. However, the determination of the residual gas fraction is very sophisticated due to the unsteady state of induction and exhaust process. There has been little work toward the development of a generally applicable model for quantitative predictions of residual gas fraction
하프브릿지형 DC-DC 컨버터의 효율특성 비교에 관한 연구
이광택(Kwangtek Lee),안태영(Taeyoung Ahn),김성철(Sungcheol Kim),유병우(Byoungwoo Ryu),봉상철(Sangcheol Bong) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
This paper presented the power losses comparison results with the Active clamp Forward, the Asymmetrical half bridge and the Two transistor forward converters. To estimate for conduction losses in the converters, the steady state analysis regard to parasitic resistance and current effective values for main parts of converters was derived. In addition, the theoretical efficiency for the converters with input voltage 400V, output voltage 12V and amximum power 480W was discussed.
이광택(Kwangtek Lee),가동훈(Donghun Ka),안태영(Taeyoung Ahn),김성철(Sungcheol Kim),유병우(Byoungwoo Ryu),봉상철(Sangcheol Bong) 전력전자학회 2006 전력전자학술대회 논문집 Vol.- No.-
This paper presented the power losses comparison results with the Two transistor forward converters. To estimate for conduction losses in the converters, the steady state analysis regard to parasitic resistance and current effective values for main parts of converters was derived. And through an experiment, verified theory estimate efficiency. In addition, the theoretical efficiency for the converters with input voltage 400V, output voltage 12V and maximum power 480W was discussed.