http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
김남욱(Namwook Kim),이대흥(Dae Heung Lee),양시우(Siu Yang),박영일(Yoeng-il Park),차석원(Suk Won Cha) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Hybrid system has two compatible power resources, an engine and a battery, and the strategies to control these two power resources cannot be simplified as an explicit algorithm because we'd like to sustain the state of charge of the battery within reasonable revel. Expect debating on how we can make optimal controllers, we might be able to draw the optimal trajectory with optimization methods if we already knew about the schedule of the driving cycle. These paper studies the optimization method of the fuel consumption for hybrid electrical vehicles with the method of Dynamic Programming, which was introduced Richard Bellman. DP is an effective method to get optimal trajectories when the systems have complicated and nonlinear behavior, and where there are several intricate constraints for control variables. We also discussed about the analytical approach for these optimal problems with a method of calculus of variation, which gives us the intuition about the optimal control of the hybrid system.
하이브리드 주행 제어 최적화를 위한 Backward Simulator의 개발
김남욱(Namwook Kim),박영일(Yoeng-il Park),서호원(Howon Seo),이대흥(Dae Heung Lee),차석원(Suk Won Cha) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Our study is focusing a development and an introduction of a backward simulator which produces a global optimal solution. Only having an optimal controller, a forward simulator could achieve near a global or absolute solution, whereas the backward simulator does not need the optimal controller because it is based on the all testing of the control. Drawback of the backward simulator is that it is not appropriate to analyze the transient characteristics of the system, so the results of the backward simulator, sometimes, is supposed be a inferior solution, but some engineers are not interested in the transient solution when their purpose of analysis is on the overall efficiency of the system. From the backward simulator, we can obtain the insight about the optimal control for hybrid electric vehicles, and can compare various vehicles which have different structures or different power resources. Our study is going on improving the simulator to calculate more complicate systems and to show better results which has more intricate constraints.
맥동 효과를 이용한 dead-end type 연료전지의 성능향상에 대한 실험적 연구
최종원(Jong Won Choi),서정훈(Jeong-hoon Seo),황용신(Yong-Sheen Hwang),이대흥(Dae Heung Lee),차석원(Suk Won Cha),김민수(Min Soo Kim) 대한설비공학회 2008 대한설비공학회 학술발표대회논문집 Vol.2008 No.2
PEM Fuel Cell operation mode can be classified into dead-end mode or open mode by whether the outlet port is blocked or not. Generally, dead-end type fuel cell has some merits on the pressure drop and system efficiency because it can generate more power than the open type fuel cell due to high operating pressure condition. However, the periodic purging process should be done for removing water which is formed as product of a reaction in the gas diffusion layer. In this study, cathode side dead-end type operation has been conducted. Moreover, pulsating flow generator at the outlet of cathode side has been suggested for increasing the period to purge the formed water because the pulsating flow can make formed water scattered uniformly over the whole channel. As a result, the purging period with pulsation increased by 1.5-2 times longer than that without pulsating.
정춘화(Zheng, Chun-Hua),김남욱(Kim, Nam-Wook),이대흥(Lee, Dae-Heung),임원식(Lim, Won-Sik),박영일(Park, Yoeng-Il),차석원(Cha, Suk-Won) 한국신재생에너지학회 2008 한국신재생에너지학회 학술대회논문집 Vol.2008 No.10
HEV(Hybrid Electrical Vehicle) is considered as one of the next generation vehicles. To develop the HEV, there must be a reliable simulator, by which the capacities of the power resources are tested, and the parameters of the HEV are optimized before developing the real model of the HEVs. This process can save the money for designing the HEV system and improve the system without experiments. Matlab Simulink is familiar to mechanical engineers and the program can simultaneously provide a system model and a controller in one program. Nowadays, the Simdriveline toolbox which is used for analysis a power-train system is applied to build a dynamic model for a HEV system. In this study, we make a HEV simulator with the Simdriveline toolbox and develop a controller. There are two simple strategies, applied to the controller. One strategy includes a power split ratio and a shift map which are created by user. Other strategy calculated an appropriate amount of resource's torque along specific results, and this is useful when users can't develop a fitting controller. The methodologies for configuring the simulator and its control system are presented in this paper.