• Title/Summary/Keyword: Electric vehicle

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A Study on the Uplift for Applying of Heavy Simple Catenary System in a Overhead Rigid Conductor Rail Transition Section (강체전차선로 이행구간 Heavy Simple Catenary 적용을 위한 압상량 고찰)

  • Kim, Wan-il;Park, Weon-Chan;Lee, Jae-Bong;Kim, Jae-Moon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.5
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    • pp.688-694
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    • 2018
  • The transition section of the overhead rigid conductor rail (ORCR) consists of a direct induction device and a limit point to prevent the power supply failure and failure of the electric railway vehicle pantograph due to the difference of the uplift in the catenary line. In T-Bar transition section, a twin simple catenary is mostly installed between the overhead catenary system (OCS) in the ground section and the ORCR in the underground section. In this paper, we compare and analyze the possibility of replacing the twin simple catenary with heavy simple catenary. The reliability of numerical analysis results was confirmed by comparing field test with numerical results. Comparing the numerical results of the twin simple catenary with the heavy simple catenary in the transition section, the difference uplift is 5.9[mm] on average. When applying heavy simple catenary instead of twin simple catenary, the slight difference of uplift can be compensated by adjusting the height of hanger-ear or support bracket.

An Integrative Research on Chinese Automobile Industry in Three Economic Blocs: Focusing on Technological Learning, Architecture, and Cluster Approach (중국 3대 경제권 자동차 산업에 대한 연구: 기술학습, 아키텍처, 클러스터를 중심으로)

  • Baek, Seo-In;Kim, Hee-Tae;Kwon, Sang-Jib
    • Knowledge Management Research
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    • v.15 no.4
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    • pp.147-170
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    • 2014
  • This study investigates the main characteristics of Chinese automobile industry based on the technology learning, architecture theory and cluster. As a case study sample, we chose three most representative automobile firms from three main cities in China, FAW from northern part of China, SAIC from middle part of China, and BYD from southern part of China. According to the research findings, FAW has equipped self-production ability in virtue of political support but felled behind in future transportation due to lack of convergence with local cluster. In case of SAIS, similar phenomenon happened in spite of highest purchasing power of shanghai. BYD has achieved great quantum jump through the aggressive investment strategy in electric vehicle even though there are still many technological learning and experience to be cumulated. Overall, this research extends the current literature on key roles (technological learning, architecture, and cluster features) in the automobile industry growth by suggesting their crucial aspects in knowledge management and strategic planning to a newly emerging market, China, and sheds light on the relationship between regional characteristics and automobile growth.

VAV Air Conditioning Research for Ship HVAC Efficiency (선박 HVAC 효율 증가를 위한 변풍량 방식 공기조화 연구)

  • Kang, Young-Min;Kim, Min-Wook;Jang, Jae-Hee;Kim, Hui-Mang;Oh, Jeon-Seok
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2016.05a
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    • pp.93-95
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    • 2016
  • In recent years, attention of ship owners for the energy saving of the vessel is being collected due to the volume decline. Ship accommodation consists of watertight type windows and is closed, Ship HVAC is used to promote a comfortable environment for the crew. In addition requirements for comfort of the crew is getting stronger with the improvement of living standards, there is a need for HVAC improvements. In this paper, propose method to save energy and improve HVAC controls by using the HVAC structure of the variable air volume.

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Study on Standard for Ensured Safety of Electric Vehicle Charger (전기자동차 충전전원 공급설비의 안전성 확보를 위한 기준 연구)

  • Lee, Ki-Yeon;Kim, Hyang-Kon;Gil, Hyung-Jun;Kim, Dong-Ook
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.2148-2149
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    • 2011
  • 환경오염에 대한 규제가 강화됨에 따라 친환경자동차의 개발과 보급이 활발하게 이루어지고 있기 때문에 전기에너지를 구동에너지로 사용하는 전기자동차의 보급을 위한 필수 요소인 전기자동차 충전 설비의 보급이 지속적으로 증가하고 있고 있지만, 전기자동차 충전설비의 안전성 확보를 위한 제도가 확립되어 있지 않은 상태에서 시범 보급되고 있는 현실이다. 따라서, 본 연구에서는 국내외 전기자동차 및 전기자동차 충전전원 공급설비관련 기준 및 표준 분석을 통하여 현재 전기설비기술기준 및 판단기준에 명시된 내용 분석을 통하여 전기자동차 충전전원 공급설비에 대한 안전성 확보를 위한 충전기, 충전케이블, 커플러 등의 시설기준에 대하여 나타내었다. 본 연구결과에 대한 활용에 따른 전기자동차 충전설비의 안전성 확보로 전 세계적인 기후변화 대응과 우리나라의 저탄소 녹색성장정책에 대응하기 위한 스마트그리드 산업의 활성화에 기여하고자 한다.

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Development of 50kW High Efficiency Fast Charger with Wide Charging Voltage Range (넓은 충전전압 범위를 갖는 50kW급 고효율 급속충전기 개발)

  • Park, Jun-Sung;Kim, Min-Jae;Jeong, Heon-Soo;Kim, Joo-Ha;Choi, Se-Wan
    • The Transactions of the Korean Institute of Power Electronics
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    • v.21 no.3
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    • pp.267-274
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    • 2016
  • In this study, a fast charger for electric vehicle with wide charging voltage range is proposed. To achieve high efficiency, three-level topologies are employed for the AC-DC and DC-DC converters. Given that the output range of the DC-DC converter in fast chargers is quite wide, the circulating current of conventional three-level converter will increase under low voltage condition. The proposed hybrid switching method mitigates this issue. When a coupled inductor is used on the output side, the circulating current is further reduced, and the switches $S_2$, $S_3$, $S_6$, and $S_7$ achieve turning-off under the ZCS condition. Experimental results from a 50 kW prototype are provided to validate the proposed charger, and a rated efficiency of 95.9% is obtained.

A Study on Feedforward Compensation Method of IPMSM for EV with Non-sinusoidal BEMF (비 정현파 역기전압을 가지는 EV용 IPMSM의 전향보상 제어기법에 관한 연구)

  • Park, Gui-Yeo;Park, Jung-Woo;Ahn, Won-Il;Shin, Duck-Woong;Jeong, Moon-Seon;Moon, Chae-Joo
    • The Transactions of the Korean Institute of Power Electronics
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    • v.18 no.6
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    • pp.573-578
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    • 2013
  • In the case of the Back EMF voltage contains the harmonics, the motor torque ripple and vibration is occurred by the current pulsation, because IPMSM control algorithm is the model which is assumed that it contains a sinusoidal Back EMF voltage. To improve ride quality, in the case of IPMSM for EV, improving the torque control characteristics is necessary. Therefore, there is a need to minimize the influence of the harmonics. In this paper, the investigation to decrease the current distortion factor has been performed for improving torque control characteristics by applying the non-sinusoidal Back EMF to IPMSM model.

Design and Experimental Verification of an Interior Permanent Magnet Motor for a High-speed Machine (고속회전기 적용을 위한 매입형 영구자석 전동기의 설계 및 검증)

  • Kim, Sung-Il;Hong, Jung-Pyo;Lee, Woo-Taik;Choi, Chin-Chul;Kwon, Hyuck-Roul;Park, Jeong-Hee
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.857_858
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    • 2009
  • On account of small size and light weight, a high-speed machine is regarded as a key technology for many future applications of drive systems. In high-speed applications, permanent magnet (PM) synchronous motors have a number of merits such as high efficiency and high power density. Accordingly, they are suitable for driving the air-blower of a fuel cell electric vehicle (FCEV) where space and energy savings are critical. Particularly, a surface-mounted PM motor of them is mainly used as a high-speed machine. However, the motor has a fatal flaw owing to a retaining can to maintain the mechanical integrity of a rotor assembly. The can results in the increase of magnetic air-gap length in the surface-mounted PM motor. Thus, in this paper, an interior PM motor is designed in order to drive the air-blower of FCEV instead of the surface-mounted PM motor, and the experimental results of two models are compared to verify the capability of the interior PM motor for a high-speed machine.

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An Optimal Energy Storage Operation Scheduling Algorithm for a Smart Home Considering Life Cost of Energy Storage System

  • Yan, Luo;Baek, Min-Kyu;Park, Jong-Bae;Park, Yong-Gi;Roh, Jae Hyung
    • Journal of Electrical Engineering and Technology
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    • v.12 no.4
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    • pp.1369-1375
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    • 2017
  • This paper presents an optimal operation scheduling algorithm for a smart home with energy storage system, electric vehicle and distributed generation. The proposed algorithm provides the optimal charge and discharge schedule of the EV and the ESS. In minimizing the electricity costs of the smart home, it considers not only the cost of energy purchase from the grid but also the life cost of batteries. The life costs of batteries are calculated based on the relation between the depth of discharge and life time of battery. As the life time of battery depends on the charge and discharge pattern, optimal charge and discharge schedule should consider the life cost of batteries especially when there is more than one battery with different technical characteristics. The proposed algorithm can also be used for optimal selection of size and type of battery for a smart home.

Probabilistic Fatigue Life Evaluation of Rolling Stock Structures (철도차량 구조물의 확률론적 피로수명 평가)

  • 구병춘;서정원
    • Transactions of the Korean Society of Automotive Engineers
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    • v.11 no.5
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    • pp.89-94
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    • 2003
  • Rolling stock structures such as bogie frame and car body play an important role for the support of vehicle leading. In general, more than 25 years' durability is needed for them. A lot of study has been carried out for the prediction of the fatigue life of the bogie frame and car body in experimental and theoretical domains. One of the new methods is a probabilistic fatigue lift evaluation. The objective of this paper is to estimate the fatigue lift of the bogie frame of an electric car, which was developed by the Korea Railroad Research Institute (KRRI). We used two approaches. In the first approach probabilistic distribution of S-N curve and limit state function of the equivalent stress of the measured stress spectra are used. In the second approach, limit state function is also used. And load spectra measured by strain gauges are approximated by the two-parameter Weibull distribution. Other probabilistic variables are represented by log-normal and normal distributions. Finally, reliability index and structural integrity of the bogie frame are estimated.

Study on Fuel Consumption Improvement in SI Engine with EGR for Hybrid Electric Vehicle (하이브리드용 가솔린엔진의 EGR을 통한 연비향상에 관한 연구)

  • Park, Cheol-Woong;Choi, Young;Kim, Chang-Gi
    • Transactions of the Korean Society of Automotive Engineers
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    • v.16 no.2
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    • pp.128-135
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    • 2008
  • EGR(exhaust gas recirculation) is considered as a most effective method to reduce the NOx emissions. But high EGR tolerance is always pursued not only for its advantages of the pumping loss reduction and fuel economy benefit in Gasoline-Hybrid engine. However, the occurrence of excessive cyclic variation with high EGR normally prevents substantial fuel economy improvements from being achieved in practice. Therefore, the optimum EGR rate should be carefully determined in order to achieve low fuel consumption and low exhaust emission. In this study, 2 liters gasoline engine with E-EGR system was used to investigate the effects of EGR on fuel efficiency, combustion stability, engine performance and exhaust emissions. With optimal EGR rates, the fuel consumption was improved by 4%. This improvement was achieved while a reduction in NOx emissions of 75% was accomplished. Increase of EGR gas temperature causes the charge air temperature to affect the knock phenomenon and moreover, the EGR valve lift changes for the same control signal.