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RISS 인기검색어
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- 저자 : 김남욱(Namwook Kim) (검색결과 116 건)
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김남욱(Namwook Kim),양호림(Horim Yang),조성태(Suntae Cho),박영일(Yoeng-il Park),차석원(Suk won Cha) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Control1ing of HEV(Hybrid Electric Vehicle) is not easy going work because the vehicle has two or more degrees of freedom. To control a dual mode hybrid system, two-mode HEV which is composed of compound planetary gear systems, comprehension of the systems is most important. The compound planetary gear systems can be extended to other hybrid systems such as THS(Toyota Hybrid System), a mild hybrid system and so on, so the strategy of controlling the compound planetary gear systems is adapted to other hybrid systems. This paper studies the method of establishing dynamic equation of the compound planetary gear system and the strategy of controlling the system. An optimization of the system is also an important problem which is solved at supervisory controller, and the optimized results are introduced in this paper, but the method of the optimization is not issued in this paper. This paper doesn't deal a supervisory control but a component control. By the efficient component control strategy, the system operates on near the optimum points.
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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.
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실험적 해석을 기반으로 한 연결기용 완충기의 등가 모델
김남욱(Namwook Kim),장현목(Hyun-mok Jang),김기남(Kinam Kim),박영일(Yeong-il Park) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Collision of trains might do damage the body of the trains when the speed of impact is high. To reduce the damage of the impact, it needs an appropriate coupling system which can absorb the impact energy. Former coupling systems have only buffer system for absorbing the energy of the impact, but these days, the coupling system which includes the buffer system and hydraulic system can absorb more energy than former system. This paper studies the performance simulation based on the experimental results. By the simulation, we can predict the maximum force of the impact if we know the characteristic of the system. Experiments for impact of trains are far expensive, and it takes a long time. Simulation, however, can be easily composed, but the higher accuracy of the simulation is needed to replace the experiment. We are going to make a simulator which has the equivalent models based on the experimental results though the simulator in this paper does not show remarkable coincident with the experimental results. We introduce the concept of the simulator.
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김남욱(Namwook Kim),양시우(Siu Yang),양호림(Horim Yang),조성태(Sungtae Cho),임원식(Wonsik Lim),차석원(Suk won Cha) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Dual mode hybrid systems are composed of few combined planetary gear sets. One planetary gear set has two DOF(degree of freedom) and the DOF increases when planetary gear sets are added, so it is complicate to analyze the systems. Methodologies of combining the planetary gear sets can be various methods, but it is needed that the methodologies have consistency. To the consistency, the equivalent parameters, α', β', R'a, R'b are introduced in this paper, and the arbitrary system, E-IVT(Electric Infinitely Variable Transmission) developed by Renault, is converted to the equivalent system with these parameters. Furthermore, the system efficiency can be represented by these parameters at hybrid mode, and the strategies of controlling the compound split can be improved by the analysis of the compound splits in this paper.
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Pontryagin’s Minimum Principle (PMP)를 이용한 하이브리드 전기차의 주행 제어 최적화
김남욱(Namwook Kim),임원식(Wonsik Lim),오창은(Chang Eun Oh),변상민(Sangmin Byun),차석원(Suk Won Cha) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4
Several optimal control ideas for Hybrid Electric Vehicles (HEVs) were proposed in the literature. The representative optimal concept based on the bellman’s optimality, Dynamic Programming, guarantees a global optimal solution which could be obtained from an optimal field. In this paper, we suggest the Pontryagin’s minimum principle as an optimal control concept, in which the principle produces necessary conditions that the optimal control trajectory must satisfy. From a static model, the optimal results solved from PMP show that the results are really close to the results solved from DP, which should be supposed to be a global optimal solution. The differences between the results solved from PMP and the results solved from DP are only under 1 %. By the optimal control concept, PMP, we could build a real-time optimal controller because the technique is fundamentally based on an instantaneous optimal concept, which means that the control idea based on PMP is very useful if we have an intelligent model to approximate the costate in real-time driving.
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