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정춘화(Chunhua Zheng),박영일(Yeong-il Park),차석원(Suk Won Cha),강상욱(Sangwook kang) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Fuel cell hybrid vehicles (FCHVs) have become one of the most promising candidates for future transportation due to current energy supply problem and environmental problem. Fuel economy is the main issue in hybrid vehicles and it depends on the power management strategies. A rule-based power management strategy for an FCHV is presented in this paper. In order to evaluate the fuel economy of the rule-based strategy adequately, the initial battery state of charge (SOC) and final battery SOC have to be the same. To consider this point, the fuel economy evaluation method based on the relationship between delta SOC and delta fuel consumption and the method based on the optimal control are presented. The concepts of equivalent fuel consumption based on the two fuel economy evaluation methods are applied to this paper. The two methods are compared to each other on the rule-based power management strategy.
정춘화(Chunhua Zheng),박영일(Yoeng-il Park),임원식(Wonsik Lim),차석원(Suk-won Cha) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
In HEV (hybrid electric vehicle) system, two or more power sources combine their output power together which is very important to effectively distribute power during vehicle operation. Some kinds of vehicle driving control strategies based on global optimization techniques, local optimization techniques, and the intelligent control strategy have been studied. In this paper, DP (Dynamic Programming) and fuzzy theory are both introduced and applied to two shaft parallel HEV and the control results are compared.
배터리 온도를 고려한 연료전지 하이브리드 차량의 PMP기반 동력 관리 전략
정춘화(Chunhua Zheng),박영일(Yeong-il Park),임원식(Wonsik Lim),차석원(Suk Won Cha) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
This paper introduces a Pontryagin’s Minimum Principle (PMP)-based power management strategy which takes into account the battery temperature in the fuel consumption evaluation. The target vehicle system is a fuel cell hybrid vehicle (FCHV) which uses a fuel cell system (FCS) and a battery as its power sources. The battery temperature affects the fuel economy, as it is related to the battery efficiency. In this paper, the relationship between the battery temperature and the fuel economy is given and the comparison to the strategy, which does not consider the effect of the battery temperature, is presented by simulation results.
정춘화(Chunhua Zheng),김모성(Moseong Kim),김형균(Hyungkyoon Kim),박영일(Yoeng-il Park),차석원(Suk Won Cha) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In a fuel cell hybrid vehicle (FCHV), the operating points of the fuel cell system (FCS) can be shifted to its high-efficiency region by using a battery and the total hydrogen consumption depends on power management strategies. Two types of power management strategies are presented in this paper and the concept of equivalent hydrogen consumption is applied to this study due to the difference between the initial and final SOC of the battery. The equivalent hydrogen consumption of each strategy is evaluated and compared to each other.
정춘화(Chunhua Zheng),박영일(Yoeng-il Park),차석원(Suk-won Cha) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Electric Vehicles (EVs) are the most promising candidates for the next generation of transportation because of the zero emission, higher efficiency than internal combustion engine vehicles, independence from petroleum, ability of recovering the braking energy, and silent driving. An EV usually uses an electric motor for traction and a battery for its energy source. The methodology for the sizing of an electric motor and a battery is introduced as well as for the selection of a final gear ratio. For an EV, improving its system efficiency is significant since its energy source is a huge issue these days. Two methodologies for improving EV system efficiency are presented and evaluated by backward simulation. Inverter loss model is constructed and applied to forward simulation to evaluate the efficiency of the inverter. Three different braking algorithms are presented and compared to each other by forward simulation.
정춘화(Chunhua Zheng),임원식(Wonsik Lim),차석원(Suk-won Cha),강상욱(Sangwook Kang) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
CVT(Continuously Variable Transmission) is one of the most promising candidates for the future automobile transmission because of its continuously variable gear ratio and reduced shift shock. It is also possible to operate the power source at its high efficiency region with CVT. The CVT system consists of thrust plate, driving pulley, belt, driven pulley, and preload spring of output shaft. In this paper, the dynamic modeling of a CVT system is completed to obtain the static performances of CVT system. A simulator is implemented on Matlab(Simulink), which can analyse the static performances of a CVT system. The methods for improving the total efficiency of a motorcycle system are also proposed based on the simulation results.