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DFSS시험기법을 이용한 저압축비 HSDI 디젤 엔진의 냉시동성 개발
최회명(Hoimyung Choi),노홍진(Hongjin Noh),이흥우(Hyeungwoo Lee),지요한(Yohan Chi),윤금중(Kum Jung Yoon) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A new process was proposed for developing the idle stability under cold starting of passenger car HSDI diesel engine. Injection parameters were successfully optimized for the starting time and the idle stability of 1.5 liter HSDI diesel engine at -25℃ through this process which includes the DFSS experimental method. The THC exhaust emission was measured during cold start and utilized for index of white smoke.
HSDI 디젤 엔진 블록 진동 신호 중 연소가진성분 분리에 대한 실험적 연구
최회명(Hoimyung Choi),이승현(Seunghyun Lee),김영관(Younggwan Kim),정인수(Insoo Jung),이진우(Jin Woo Lee),민경덕(Koungdoug Min) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
This study is the experimental research on how to separate combustion-induced vibration component from vibration signal measured on the cylinder block of HSDI EURO-5 diesel engine. The typical separation method to compare the motoring condition and firing one cannot be used in this case because a high pressure fuel injection system in HSDI engine occurs much vibration when it works. Therefore, a new signal separation method is suggested to compare the signals measured in motoring, firing and additional misfiring condition. To implement the suggested method, measured vibration signals are analyzed in time and frequency domain by using the Wavelet transform.
최회명(Hoimyung Choi),김용태(Yongtae Kim),민경덕(Kyoungdoug Min) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A new stratified combustion model for Direct-Injection Spark-Ignition engines is presented, which considers the secondary diffusion flame in the burned region and the effect of mixture fraction fluctuation on the laminar burning velocity.<br/> For the primary flame propagation, a Flame Area Evolution (FAE) model was adopted and extended to partially premixed combustion by implementing the variance of mixture fraction and the concept of probability density function. And a 2-step reaction mechanism of water-gas shift reaction and hydrogen oxidation was applied to the diffusion flame with the equilibrium concentration of CO, CO₂ H₂ and H₂O in the burned gas. In addition to these models, a new correlation of the laminar burning velocity was adopted. which can be applicable to much wider range of equivalence ratio, pressure and temperature than the other models. The direct-injection gasoline spray model was implemented in order to form a stratified Fuel-air mixture.<br/> Under stratified charged condition. 3-dimensional simulation was performed in a Direct-Injection Spark-Ignition engine geometry by using STAR-CD. The simulation results can be useful to understand the combustion process of DISI engine. And. the present model proves itself to be reasonable to simulate the characteristics of flame propagation, diffusion reaction, concentrations of products in burned region, and burned gas temperature.