• Title/Summary/Keyword: hybrid driving

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Development and Application of LPB Management System for Bimodal Tram (바이모달트램용 LPB Management System 개발 및 적용)

  • Lee, Kang-Won;Mok, Jai-Kyun
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.64 no.4
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    • pp.231-235
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    • 2015
  • Bimodal Tram developed by KRRI is driven by a series Hybrid propulsion system which has both the CNG engine, generator and LPB(Lithium Polymer Battery) pack. It has three driving modes; Hybrid mode, Engine mode and Battery mode. Even in case of Battery mode, LPB pack to get enough power to drive the vehicle only by itself onsists of 168 LPB cells(80Ah per lcell), 650V. It is important thing to manage LPB pack in a right way, which will extend the lifetime of LPB cells and operate in the hybrid mode effectively. This paper has shown the development of battery management system(12 BMS, 1 BMS per 14cells) to manage LPB pack which is connected with CAN(Controller Area Network) each other and measure the voltage, current, temperature and also control the cooling fan inside of LPB pack. Using the measured data, BMS can show the SOC(State of Charge), SOH(State of Health) and other status of LPB pack including of the cell balancing.

A Simulation Study of the Performance of a Propulsion Equipment for Bimodal Tram (바이모달 트램의 추진장치 성능 모의)

  • Bae, Chang-Han;Mok, Jai-Kyun;Chang, Se-Ky;Lee, Kang-Won
    • Journal of the Korean Society for Railway
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    • v.12 no.1
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    • pp.122-128
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    • 2009
  • A bimodal low-floor tram is designed to provide the flexibility of bus and the punctuality of trains together to the passengers. The propulsion equipment of the bimodal tram is a series hybrid type using a set of CNG engine generator and Li-polymer battery. The present paper describes the specifications of the propulsion system in the bimodal tram which was drawn by a desirable driving cycle. In addition, it shows how the propulsion system of the bimodal tram can be controlled. With using a computer simulation tool of hybrid vehicles, ADVISOR, the performance of the bimodal tram was verified.

Development of New Rapid Prototyping System Performing both Deposition and Machining(I);Process and Framework (적층과 절삭을 복합적으로 수행하는 새로운 개녕의 판재 적층식 쾌속 시작 시스템의 개발(I);공정 및 기반구조)

  • Heo, Jeong-Hun;Hwang, Jae-Cheol;Lee, Geon-U;Kim, Jong-Won;Han, Dong-Cheol;Ju, Jong-Nam;Park, Jong-U
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.24 no.8 s.179
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    • pp.1958-1967
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    • 2000
  • Rapid Prototyping( RP ) has been increasingly applied in the process of design and development of new products. RP can shrink the time and expense required to bring a new product from initial concept to production. However, the necessity of using RP for short-run manufacturing is continuously driving a development of a cost-effective technique that will produce completely-finished quality parts in a very short time. To meet these demands, the improvements in production speed, accuracy materials, and cost are crucial. Thus, a new hybrid-RP system performing both deposition and machining in a station is proposed in this paper. It incorporates both material deposition in layers and material removal from the outer surface of the layer to produce the required surface finish. The new hybrid-RP system can dramatically reduce the total build time and fabricate largo-sized and freeform objects because it uses very thick layers, i.e.

Component Sizing for the Hybrid Electric Vehicle (HEV) of Our Own Making Using Dynamic Programming (동적계획법을 이용한 자작 하이브리드 자동차의 용량 매칭)

  • Kim, Gisu;Kim, Jinseong;Park, Yeong-il
    • Journal of the Korean Society of Manufacturing Technology Engineers
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    • v.24 no.5
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    • pp.576-582
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    • 2015
  • Generally, the fuel economy of hybrid electric vehicle (HEV) is effected by the size of each component. In this study the fuel economy for HEV of our own making is evaluated using backward simulator, where dynamic programming is applied. In a competition, the vehicle is running through the road course that includes many speed bumps and steep grade. Therefore, the new driving cycle including road grade is developed for the simulation. The backward simulator is also developed through modeling each component. A performance map of engine and motor for component sizing is made from the existing engine map and motor map adapted to the HEV of our own making. For optimal component sizing, the feasible region is defined by restricting the power range of power sources. Optimal component size for best fuel economy is obtained within the feasible region through the backward simulation.

Modeling of Hybrid Railway Vehicles with Hydrogen Fuel-Cell/Battery using a Rule-Based Algorithm (규칙기반 알고리즘을 이용한 수소연료전지/배터리 하이브리드 철도차량 모델링)

  • Oh, Yoon-Gi;Han, Byeol;Oh, Yong-Kuk;Ryu, Joon-Hyoung;Lee, Kyo-Beum
    • Journal of IKEEE
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    • v.24 no.2
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    • pp.610-618
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    • 2020
  • This paper presents the modeling of hybrid railway vehicles with hydrogen Fuel-Cells (FCs)/battery using a rule-based algorithm. The driving power of traction system is determined with the speed-torque curve by operation area of the electric machine and the electrical systems are modeled. The demanded power of electrical systems is set with the energy management system (EMS). The consumption of hydrogen is effectively managed with the subdivided operation region depending on the state of charge (SOC). The validity of the modeling is verified using MATLAB/Simulink.

Modulation Depth Dependence of Timing Jitter and Amplitude Modulation in Mode-Locked Semiconductor Lasers (모드잠김 반도체 laser의 타이밍 지터및 크기 변조의 변조 신호 크기 의존성)

  • Kim, Ji-hoon;Bae, Seong-Ju;Lee, Yong-Tak
    • Proceedings of the Optical Society of Korea Conference
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    • 2000.02a
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    • pp.276.2-278
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    • 2000
  • In a recent years, a number of approaches have been studied, including passive, active, and hybrid mode-locking of semi-conductor lasers for short pulse generation and research has been devoted to achieve low timing-jitter operation since the timing jitter is unfavorable for system applications. Among the methods of mode locking, passive mode locking does not need external rf drives, and therefore the operation and fabrication procedures are simplified. In spite of these attractive advantages of passive mode-locked laser, it has critical drawbacks such as large timing jitter and the difficulty in synchronization with external circuits. Their inherent large timing jitter value was shown to be suppressed to certain levels by means of hybrid mode-locking technique$^{(1)}$ , where the saturable absorber section was modulated by an external signal with the cavity round trip frequency. Furthermore, the subharmonic mode-locking (SHML) technique alleviates the restrictions of high speed driving electronics. It has been demonstrated experimentally$^{(1)}$ that the hybrid subharmonic mode-locking technique has lead to significant reduction of the timing jitter. (omitted)

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Optimal Control of Fuel Cell Hybrid Vehicles (연료전지 하이브리드 자동차의 최적 제어)

  • Zheng, Chun-Hua;Park, Yeong-Il;Lim, Won-Sik;Cha, Suk-Won
    • Transactions of the Korean Society of Automotive Engineers
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    • v.20 no.2
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    • pp.135-140
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    • 2012
  • Fuel Cell Hybrid Vehicles (FCHVs) have already become the subject of major interest among automotive industry as well as power management strategies of FCHVs, as the fuel economy of FCHVs depends on them. There are several types of power management strategies of FCHVs that have been developed to improve the fuel economy of FCHVs. Among them, optimal control theory is applied to this study. A problem is defined and its objective is to minimize the energy consumption of an FCHV and to find the optimal trajectories of powertrain parameters during driving. Necessary conditions for the optimal control are introduced and the simulation results of constant costate are compared to that of variable costate in order to prove that the variable costate can be replaced with the constant costate.

Development of Energy Regeneration Algorithm using Electro-Hydraulic Braking Module for Hybrid Electric Vehicles (회생제동 전자제어 유압모듈을 이용한 하이브리드 차량의 에너지 회수 알고리즘 개발)

  • Yeo, H.;Kim, H.S.;Hwang, S.H.
    • Transactions of The Korea Fluid Power Systems Society
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    • v.5 no.4
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    • pp.1-9
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    • 2008
  • In this paper, an energy regeneration algorithm is proposed to make the maximum use of the regenerative braking energy for a parallel hybrid electric vehicle(HEV) equipped with a continuous variable transmission(CVT). The regenerative algorithm is developed by considering the battery state of charge(SOC), vehicle velocity and motor capacity. The hydraulic module consists of a reducing valve and a power unit to supply the front wheel brake pressure according to the control algorithm. In order to evaluate the performance of the regenerative braking algorithm and the hydraulic module, a hardware-in-the-loop simulation (HILS) is performed. In the HILS system, the brake system consists of four wheel brakes and the hydraulic module. Dynamic characteristics of the HEV are simulated using an HEV simulator. In the HEV simulator, each element of the HEV powertrain such as internal combustion engine, motor, battery and CVT is modelled using MATLAB/$Simulink^{(R)}$. In the HILS, a driver operates the brake pedal with his or her foot while the vehicle speed is displayed on the monitor in real time. It is found from the HILS that the regenerative braking algorithm and the hydraulic module suggested in this paper provide a satisfactory braking performance in tracking the driving schedule and maintaining the battery state of charge.

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PSIM Simulator for Analysis of Series HEV Operation (직렬형 HEV 운전 특성 분석을 위한 PSIM 시뮬레이터)

  • Lim, Deok-Young;Im, Jae-Kwan;Choi, Jae-Ho;Chung, Gyo-Bum
    • The Transactions of the Korean Institute of Power Electronics
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    • v.15 no.6
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    • pp.487-497
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    • 2010
  • This paper describes the PSIM simulator for the analysis of the series type HEV operation. The traction force of the series type HEV of which engine is electrically coupled with a traction motor is supplied from the traction motor only. The rating of each power train components, such as gear, motor, ESS, ICE/generator, is designed with the Energy-Based Modeling method and the Electrical Peaking Hybrid(ELPH) method. Under driving cycle, the designed series HEV is evaluated with the developed PSIM simulator. A comparison between the conventional braking and the regenerative braking is performed with the average motor input power. And the fuel economy analysis is carried out on the basis of the simulation results.

Hybrid Technology using 3D Printing and 5-axis Machining for Development of Prototype of the Eccentric Drive System (편심구동장치 시제품 개발을 위한 3D프린팅-5축가공 복합기술)

  • Hwang, Jong-Dae;Yang, Jun-Seok;Yun, Sung-Hwan;Jung, Yoon-Gyo
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.15 no.2
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    • pp.38-45
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    • 2016
  • Since a 5-axis machine tool has two rotary axes, it offers numerous advantages, such as flexible accessibility, longer tool life, better surface finish, and more accuracy. Moreover, it can conduct whole machining by rotating the rotary feed axes while setting the fixture at once without re-fixing in contrast to conventional 3-axis machining. However, it is difficult to produce complicated products that have a hollow shape. In contrast, 3D printing can produce an object with a complicated hollow shape easily and rapidly. However, because of layer thickness and shrinkage, its surface finish and dimensional accuracy are not adequate. Therefore, this study proposes hybrid technology by integrating the advantages of these two manufacturing processes. 3D printing was used as the additive manufacturing rapidly in the whole body, and 5-axis machining was used as the subtractive manufacturing accurately in the joining and driving places. The reliability of the proposed technology was verified through a comparison with conventional technology in the aspects of processing time, surface roughness. and dimensional accuracy.