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윤승현(Seung Hyun Yoon),김명윤(Myung Yoon Kim),권상일(Sang Il Kwon),전학식(Hak Sik Jeon),이창식(Chang Sik Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In this work, a single cylinder DI diesel engine equipped with common-rail injection system was used to investigate the effect of biodiesel on the combustion and emission characteristics. In order to compare the emissions of oxygenated fuel with the diesel fuel, tested fuels were neat diesel and biodiesel obtained from soybean oil. Experimental results show that the peak injection rate is reduced when the engine is fueled with biodiesel. The peak combustion pressure of biodiesel was higher than that of neat diesel at an injection pressure of 100㎫. The ignition delay of biodiesel was reduced due to a higher cetane number of the biodiesel. HC and CO emissions are decreased at a high injection pressure and IMEP, thermal efficiency are also increased. However, NOx, emission of biodiesel combustion was increased compared with diesel combustion. Cooled-EGR increased the ignition delay and decreased maximum combustion pressure and the NOx, emission was rapidly decreased with 30% of EGR rate.
압축착화 엔진에서 바이오디젤-바이오에탄올 혼합연료의 연소 및 미세입자 배출물 특성
윤승현(Seung Hyun Yoon),차준표(June Pyo Cha),황진우(Jin Woo Hwang),성낙원(Nak Won Sung),이창식(Chang Sik Lee) 한국자동차공학회 2009 한국 자동차공학회논문집 Vol.17 No.6
An experimental investigation was performed to analyze the effects of biodiesel-bioethanol blended fuel on the combustion and exhaust emission characteristics in a single cylinder common-rail diesel engine. In order to analyze the combustion, exhaust emissions and measurement of size distributions of particulate matter were carried out under various engine operating conditions for biodiesel blended with ethanol by 10% and 20% volume based fraction and the results were compared to those of ultra low sulfur diesel (ULSD). In this investigation, combustion of diesel and biodiesel-ethanol blended fuels indicated similar patterns of combustion pressures and rate of heat releases. However, the combustion of biodiesel-ethanol blends showed lower combustion pressures and heat release rates than those of diesel fuel because of its lower heating value. In the case of exhaust gas recirculation (EGR), the indicated specific NOx (ISNOx) and soot concentration results in the low emissions compared to those of conventional diesel fuel. In addition, the particulate size distribution shows that biodiesel-ethanol blends suppress the formation of large particles and lead to increase of small particles.
윤승현(Seung Hyun Yoon),안상규(Sang Gyu An),김명윤(Myung Yoon Kim),권상일(Sang Il Kwon),이창식(Chang Sik Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
In this work, a single cylinder direct injection diesel engine equipped with common-rail injection was used to investigate the combustion and emissions characteristics of biodiesel fuel. Tested fuels were neat diesel and biodiesel obtained from unpolished rice. The volumetric blending ratios of biodiesel with conventional diesel fuel are set at 0. 10, 20 and 40%. Also the physical properties of blended fuels such as viscosity, surface tension and cetane number were analyzed to investigate the relations with the combustion and emission characteristics.<br/> Experimental results show that the combustion pressure was increased at higher mixing ratio and injection pressure. The ignition delay became shorter with the increase of mixing ratio due to higher cetane number of biodicsel. The peak combustion pressure is increased with the rise of mixing ratio at an injection pressure of 100㎫, however opposite trend is shown at an injection pressure of 50㎫. Soot emission can be reduced by using biodiesel up to 70% compared to the conventional diesel fuel. But, NOx emission was slightly increased as the mixing ratio of biodiescl fuel increased. Also, EGR increased the ignition delay and decreased maximum combustion pressure.
바이오에탄올 SI 엔진에서 에탄올-가솔린 연료 혼합비율에 따른 희박연소 및 배기 특성
윤승현(Seung Hyun Yoon),김대성(Dae Sung Kim),이창식(Chang Sik Lee) 한국자동차공학회 2011 한국 자동차공학회논문집 Vol.19 No.1
Lean combustion and exhaust emission characteristics in a ethanol fueled spark-ignited engine according to ethanol-gasoline fuel blending ratio were investigated. The test engine was 1591 ㎤ and 10.5 of compression ratio SI engine with 4 cylinders. In addition, lambda sensor system was connected with universal ECU to control the lambda value which is varied from 1.0 to 1.5. The engine performance and lean combustion characteristics such as brake torque, cylinder pressure and rate of heat release were investigated according to ethanol-gasoline fuel blending ratio. Furthermore, the exhaust emissions such as carbon monoxide (CO), unburned hydrocarbon (HC), nitrogen oxides(NO<SUB>x</SUB>) and carbon dioxide (CO₂) were measured by emission analyzers. The results showed that the brake torque, cylinder pressure and the stability of engine operation were increased as ethanol blending ratio is increased. Brake specific fuel consumption (BSFC) was increased in higher ethanol blending ratio while brake specific energy consumption (BSEC) was decreased in higher ethanol blending ratio. The exhaust emissions were decreased as ethanol blending ratio is increased under overall experimental conditions, however, some specific exhaust emission characteristics were mainly influenced by lambda value and ethanol-gasoline fuel blending ratio.
매틀랩/시뮬링크 기반 플렉스레이 네트워크 시스템의 구현 및 검증
윤승현(Seung-Hyun Yoon),서석현(Suk-Hyun Seo),황성호(Sung-Ho Hwang),권기호(Key Ho Kwon),전재욱(Jae Wook Jeon) 제어로봇시스템학회 2010 제어·로봇·시스템학회 논문지 Vol.16 No.7
As increasing the number of Electronic Control Units in a vehicle, the proportion for reliability and stability of the software is going increasingly. Accordingly, the traditional CAN network has occurred the situation that the requirement of developing vehicle software is not sufficient. To solve these problems, the FlexRay network which is ensured the high bandwidth and real-time is generated. However it is difficult to implement FlexRay based application software because of complex protocol than traditional CAN network. Accordingly the system for analysis and verification of network state is needed. Also vehicle vendor develops application software using Matlab/Simulink in order to increase productivity. But this development method is hard to solve the network problem of node to node. Therefore this paper implements Matlab/Simulink based FlexRay network system and verifies it through comparing with existing embedded system.
김이성,윤승현,박강근,Kim, Ie-Sung,Yoon, Seoung-Hyun,Park, Kang-Geun 한국공간구조학회 2007 한국공간구조학회지 Vol.7 No.6
Today, many studies are progressed about source of vibration oscillator in reinforcement concrete structures. Source of vibration oscillator is load when it is happen from walking inhabitant. It is transmitted to another inhabitant through reinforcement concrete plate, and it is type of elastic wave. Those descriptions are ram wave and primary wave, secondary wave, and the are through the surface and inside plate. Analysis studies of those waves are used to piezoelectric materials. But, they are difficult to 3 axial type of transmitting elastic wave in concrete element. In this study, a fundamental study for source estimations of vibration oscillator using micro accelerometer are discussed. 철근 콘크리트 구조물에서 발생하는 진동 가진원과 영향에 대하여 많은 연구가 진행 중에 있다. 이러한 진동 가진원은 주로 거주자가 보행할 때 발생하는 하중이며, 발생한 가진원은 철근 콘크리트 판을 통하여 다른 거주자에게 전달된다. 이러한 전달원은 탄성파의 형태로 전달되는데 판의 표면으로 전달되는 표면파(Ram Wave)와 판의 내부로 전달되는 체적파(Prima Wave, Secondary Wave)의 형태로 전달된다 현재 이러한 파를 분석하는 연구는 압전소자(PZT)센서를 주로 사용하고 있으나, 콘크리트 부재에서 3축 형데로 전달되는 탄성파를 분석하기에는 여러 가지 어려운 부분이 많다. 따라서 이를 해결하기 위해 마이크로 가속도센서(Micro Accelerometer)를 이용하여 이동하중으로 발생하는 가진원에 대하여 평가하였다.
안상규(Sang Gyu An),윤승현(Seung Hyun Yoon),김명윤(Myung Yoon Kim),이제형(Je Hyung Lee),이창식(Chang Sik Lee) 한국자동차공학회 2005 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2005 No.11_1
To investigate the potential of DME as a fuel for compression ignition engine. an experimental investigation was performed. The DME is supplied by the additional fuel pressurization system and common-rail injection system and the injection nozzle is equipped in the center of combustion chamber. The injection pressures of DME are varied from 40 to 60㎫, and the combustion and emission characteristics were compared with that of diesel fuel injected with 50㎫ of injection pressure. Also, 45% of EGR was implemented to reduce NOx exhaust emissions.<br/> The results show that ignition delay was shortened and combustion duration was extended when DME is supplied. Judging from the engine test, DME is suitable fuel for common-rail diesel engine due to it's clean emission characteristics. DME engine didn't emitted soot emission for whole operating condition.