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엔진 공회전과 시동 시 연비 및 배기가스 특성 비교연구
최교남(Kyonam Choi),조규백(Gyubaek Cho),정동수(Dongsoo Jeong) 한국자동차공학회 2002 한국자동차공학회 Symposium Vol.2002 No.11
Only about 15% of total input fuel in engine could be contributed to the vehicle driving directly and others were<br/> consumed as loss such as heat, friction, and about 17% could be consumed in unnecessary idling.<br/> As stopping engine idling on stop or parking can save fuel consumption and emission reduction, advanced<br/> countries conduct anti-idling campaign and make idling regulation.<br/> In this paper, we have performed the experimental analysis about the effects of fuel consumption and emission<br/> reduction in case of engine idling and restarting conditions.
LPG 액상분사식 인젝터에서 후적에 의한 아이싱 특성 연구
박철웅,김창업,최교남,강건용,Park, Cheol-Woong,Kim, Chang-Up,Choi, Kyo-Nam,Kang, Kern-Yong 한국자동차공학회 2007 한국 자동차공학회논문집 Vol.15 No.5
Since the liquid phase LPG injection(LPLI) system has an advantage of higher power and lower emission characteristics than the mixer type fuel supply system, many studies and applications have been conducted. However, the heat extraction, due to the evaporation of liquid fuel, causes not only a dropping of LPG fuel but also icing phenomenon that is a frost of moisture in the air around the nozzle tip. Because both lead to a difficulty in the control of accurate air fuel ratio, it can result in poor engine performance and a large amount of HC emissions. The experimental investigation was carried out on the bench test rig in this study. It was found that n-butane, that has a relatively high boiling point($-0.5^{\circ}C$), was a main species of droplet composition and also found that the droplet problem was improved by the use of a large inner to outer bore ratio nozzle whose surface roughness is smooth. The icing phenomena were decreased when the an engine head temperature was increased, although a large amount of icing deposit was still observed in the case of $87^{\circ}C$. Also, it was observed that the icing phenomenon is improved by using anti-icing bushing.
이승진,류정인,최교남,정동수 한국에너지학회 2005 에너지공학 Vol.14 No.3
소형고속엔진에서 연료분사 시스템은 기화기시스템 보다 출력, 연료소비율, 배기가스 등에서 향상된 결과를 가져온다. 최근에 국내에서 연료분사시스템은 차량에 사용되지만 이륜차에서는 사용되지는 않는다. 엔진에서 EFI(전자식연료분사)시스템은 변화하는 회전수에 따라 ECU 에서 정확한 연료를 공급할 수 있다. 본 연구의 목적은 이륜차에 사용되는 4valve SOHC 단기통 소형엔진에서 다양한 회전수에 맞는 엔진성능과 효율을 개선하기 위해 회전수별 연료분사효과를 고찰하였다.
디젤 엔진에서 금속 푬을 적용한 SCR 촉매의 특성 분석
김용래 ( Yong Rae Kim ),최교남 ( Kyo Nam Choi ) 한국분무공학회 2013 한국액체미립화학회지 Vol.18 No.4
SCR(Selective Catalytic Reduction) is a major after-treatment solution to reduce NOx emission in recent diesel engines. In this study, a metal foam is applied as an alternative SCR substrate and tested in a commercial diesel engine to compared with a conventional ceramic SCR system. Basic engine test from NO-13 mode shows that a metal foam catalyst has lower NOx conversion efficiency than a ceramic catalyst especially over 350ae. A metal foam catalyst has characteristics of high exhaust gas pressure before a SCR catalyst and high heat transfer rate due to its material and structure. NOx conversion effi-ciency of a metal foam catalyst shows an increasing tendency along with the increase of exhaust gas temperature by 500ae. The effect of urea injection quantity variation is also remarkable only at high exhaust gas temperature.
서승우,정동수,오승묵,최교남,Seo, Seung-U,Jeong, Dong-Su,O, Seung-Muk,Choe, Gyo-Nam 한국기계연구원 1993 硏究論文集 Vol.23 No.-
In general, natural gas engine converted from gasoline engine has disadvantage of power decrease. In order to increase power output in natural gas engine, the improvement of in-cylinder flow motion has been believed as the most effective method. In this study, the geometry of combustion chamber in 4 valve DOHC natural gas engine is modified, and in-cylinder flow patterns are analyized. Also engine performance is evaluated according to the modification of in-cylinder flow motion.