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이용규(Y G Lee),김만식(M Kim),한성주(S J Han),민경덕(K Min),김응서(E S kim) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
3D computation was performed to predict the knock onset angle and autoignition location in a commercial 3-valve pent-roof type spark ignition engine. Weller's combustion model and reduced chemical mechanism of hydrocarbon fuels in the low temperature which was proposed by Keck and Hu were combined to simulate the flame propagation and autoignition of unburned gas. In order to verify the numerical results by experiments, pressure transducer and 11 ion probes were installed in the cylinder head. Autoignition location could be determined from the knock onset angle determined by cylinder pressure and flame arrival time determined by ion probes. The pressure traces and flame arrival time of numerical results were compared with the experiments. The numerical results were in good agreements with the experiments. Therefore knock onset time and its location could be predicted.<br/>
벡터제어를 적용한 엘리베이터 도어용 유도전동기 구동 시스템 개발
박내춘(N.C. Park),조영훈(Y.H. Cho),이용규(Y.G. Lee),목형수(H.S. Mok),김상훈(S.H. Kim) 전력전자학회 2008 전력전자학술대회 논문집 Vol.- No.-
스칼라 제어에 속하는 V/F 방식은 기본파 전압의 실효값과 주파수를 독립변수로 하여 평균적인 토크를 제어함으로 제어가 쉽고 구현이 간단하여 산업계에서 널리 쓰이고 있다. 그러나 주파수의 변화에 따라서 전동기 내부 임피던스도 변화하기 때문에 단순히 주파수만을 가변 하는 것만으로는 약계자에 의한 토오크 부족이나 과여자에 의한 여자 포화등에 의해 역률과 효율이 떨어진다. 또한 순시적인 토오크 제어가 불가능하여 전동기의 고성능 제어가 어렵다. 본 논문에서는 벡터제어를 적용한 엘리베이터 도어용 유도전동기 구동 시스템을 제안하고 실험을 통해 그 성능을 확인하였다.
이형승(H.S.Yi),김종우(J.W.Kim),박종범(J.B.Park),이용규(Y.G.Lee),김응서(E.S.Kim) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
Intalke port injecion type and in-cylinder injection type hydrogen fuel suply systems were designed, assembled and adapted to the single cylinder research engine to understand the performance and emission characteristics of hydrogen fueled engine according to the mixture formation.<br/> At the lou load condition, extemal mixing method wiht the intake port injection was superior in thermal efficiency and engine operation stability. At the high load condition, internal mixing method with the in-cylinder injection was superior to the external mixing. At the engine test with the condition of throttle valve control, the engine was operated more stable and more efficiently when the fuel-air equivalence ratio was maintained above some level in spite of pumping loss, due to the stable combustion. This trend was showed in both cases, intake port injection and in-cylinder injection.<br/> The hydrogen fueled engine can be operated more efficiently with the in-cylinder injection at higher load and with the intake port injection at lower load. Throttle control at low load condition makes the hydrogen engine more efficient.<br/>