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후륜측 클러치 조작 횟수에 따른 4WD 하이브리드 시스템의 백워드 시뮬레이션 방법
김형균(Hyungkyoon Kim),차석원(Sukwon Cha),임원식(Wonsik Lim),강상욱(Sangwook Kang) 한국자동차공학회 2012 한국자동차공학회 학술대회 및 전시회 Vol.2012 No.11
A 4WD hybrid system has two powertrains, one is operated by engine for front wheels, another is operated by motor for rear wheels. This System was developed for substituting conventional 4WD vehicles. Advantages of 4WD hybrid system are follows. First, it has less power transfer loss because there are no transfer and propeller shaft. Second, fuel economy of this system can be improved by using regenerative braking and Idle Stop & Go. To maximize these advantages, it is important to establish the control strategy for driving status. One of the ways for establishing the control strategy is backward simulation by using Dynamic Programming. However, because the result by using this method is for ideal driving status, direct application for control strategy by using this result is difficult. Therefore, considering real conditions for backward simulation is needed. In this research, backward simulation for 4WD hybrid system is implemented by considering one of real conditions which is the number of the operation of rear clutch.
최훈(Hoon Choi),차석원(Sukwon Cha) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
This study considers the Characteristics of the air side in DMFCs. Especially, we treated the effect of pressure drop across inlet and outlet on the performance, and the performance effect about a variation of the gasket thickness at the cathode side of the DMFCs (Direct Methanol Fuel Cell). In this paper, we present how the control of pressure drop affects performance of DMFC by different channel design. High differential pressure between inlet and outlet increase cell performance, but simultaneously, parasitic loss is enlarged. Also, it is proved that thickness of cathode gasket has influence to performance. When GDL is compressed enough, the ohmic loss is increased. However, excessiveness of GDL compression cause poor mass transfer. It is shown how the optimal gasket thickness may be achieved at the cathode side.
입력 분기식 하이브리드 동력전달계의 배터리 사용 최적화
양호림(Horim Yang),박영일(Yoengil Park),차석원(Sukwon Cha) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is very important for the fuel economy of hybrid electric vehicle to determine when a battery should be used. Optimal battery use can be determined by the optimization methods such as Dynamic Programming and Pontryagin’s Minimum Principle, however these methods needs so much times. In this paper, the variable FCpp was proposed, which represents the efficiency of a battery use. The lower FCpp means that using battery is more efficient. It is possible to conclude the times of battery use by comparison of FCpp at various situation, and also determine the cruise mode of hybrid electric vehicles.
최종원(Choi, Jongwon),이주형(Lee, Juhyung),차석원(Cha, Sukwon),김민수(Kim, Minsoo) 한국신재생에너지학회 2010 한국신재생에너지학회 학술대회논문집 Vol.2010 No.06
Generally, a coolant of the nuclear power plant is manufactured by electrolyzing the sea water near the plant for making the sodium hypochlorite(NaOCl), which is used for sterilizing the bacteria and the shellfishes sticking to the drains or the pumps at the outlet of the cooling system due to 8-10?C warmer temperature than the inlet sea water. During manufacturing the sodium hypochlorite, the hydrogen with the high purity is also produced at the anode side of the electrolyzer. This paper describes a novel power plant system combined with the polymer electrolyte membrane(PEM) fuel cell, the wasted hydrogen from the sea water electrolyzer and the wasted heat of the nuclear power plant. The present status over the exhausted hydrogen at twenty nuclear power plants in Korea was investigated in this study, from which an available power generation is estimated. Furthermore, the economic feasibility of the PEM fuel cell power plant is also evaluated by a current regulations over the power production and exchange using a renewable energy shown in Korea Power Exchange(KRX).