• Title/Summary/Keyword: EV (Electric Vehicle)

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Design of a Switched Reluctance Motor Driving an Electric Compressor for HEVs (하이브리드 자동차(HEV) 용 전동식 컴프레서 구동을 위한 SRM 설계)

  • Jeong, Yong-Hoe;Jeon, Yong-Hee;Kang, Jun-Ho;Kim, Jaehyuck
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.62 no.5
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    • pp.620-625
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    • 2013
  • This paper presents the design of a switched reluctance motor (SRM) for electric air conditioning compressors which are applied to hybrid electric vehicles (EVs). The motor for driving air conditioning compressor which is recently used on EV(electric vehicle) / HEV (hybrid electric vehicle) is PMSM(permanent magnet synchronous motor) or BLDCM(brushless DC motor). However disadvantage of motors that uses permanent magnets are vulnerable to high temperatures because of the demagnetization by the high temperature and the permanent magnet is expensive because of the high price of rare earth materials from China's monopoly. Therefore, in the automotive insustry is interested in the non-rare-earth motors. SRM has many advantages. it's resistant to high temperatures, price is cheaper, because there are no permanent magnets and winding in the rotor. Also it's high relability and efficiency, suitable for high-speed operation because of structure is simple. In this paper, the SRM, non-rare-earth motor, are designed, analyzed and experimented drive to replace an existing electric compressor drive motor.

A Study on EV Charging Scheme Using Load Control

  • Go, Hyo-Sang;Cho, In-Ho;Kim, Gil-Dong;Kim, Chul-Hwan
    • Journal of Electrical Engineering and Technology
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    • v.12 no.5
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    • pp.1789-1797
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    • 2017
  • It is necessary to charge electric vehicles in order to drive them. Thus, it is essential to have electric vehicle charging facilities in place. In the case of a household battery charger, the power similar to that consumed by a household with a basic contract power of 3kW is consumed. In addition, many consumers who own an electric vehicle will charge their vehicles at the same time. The simultaneous charging of electric vehicles will cause the load to increase, which then will lead to the imbalance of supply and demand in the distribution system. Thus, a smart charging scheme for electric vehicles is an essential element. In this paper, simulated conditions were set up using real data relating to Korea in order to design a smart charging technique suitable for the actual situation. The simulated conditions were used to present a smart charging technique for electric vehicles that disperses electric vehicles being charged simultaneously. The EVs and Smart Charging Technique are modeled using the Electro Magnetic Transients Program (EMTP).

Current Trend of EV (Electric Vehicle) Waste Battery Diagnosis and Dismantling Technologies and a Suggestion for Future R&D Strategy with Environmental Friendliness (전기차 폐배터리 진단/해체 기술 동향 및 향후 친환경적 개발 전략)

  • Byun, Chaeeun;Seo, Jihyun;Lee, Min kyoung;Keiko, Yamada;Lee, Sang-hun
    • Resources Recycling
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    • v.31 no.4
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    • pp.3-11
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    • 2022
  • Owing to the increasing demand for electric vehicles (EVs), appropriate management of their waste batteries is required urgently for scrapped vehicles or for addressing battery aging. With respect to technological developments, data-driven diagnosis of waste EV batteries and management technologies have drawn increasing attention. Moreover, robot-based automatic dismantling technologies, which are seemingly interesting, require industrial verifications and linkages with future battery-related database systems. Among these, it is critical to develop and disseminate various advanced battery diagnosis and assessment techniques to improve the efficiency and safety/environment of the recirculation of waste batteries. Incorporation of lithium-related chemical substances in the public pollutant release and transfer register (PRTR) database as well as in-depth risk assessment of gas emissions in waste EV battery combustion and their relevant fire safety are some of the necessary steps. Further research and development thus are needed for optimizing the lifecycle management of waste batteries from various aspects related to data-based diagnosis/classification/disassembly processes as well as reuse/recycling and final disposal. The idea here is that the data should contribute to clean design and manufacturing to reduce the environmental burden and facilitate reuse/recycling in future production of EV batteries. Such optimization should also consider the future technological and market trends.

Market Segmented Analysis of Electric Vehicle Purchasing Behavior in Seoul (서울시 전기차 구매행태에 대한 시장분할 분석)

  • HAHN, Jin-Seok;LEE, Jang-Ho
    • Journal of Korean Society of Transportation
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    • v.36 no.2
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    • pp.129-140
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    • 2018
  • In this study, we analyzed the electric vehicle (EV) purchasing behavior with market segmentation in Seoul using the binary logit model. For the model estimation, the experimental design of SP survey generated 24 scenarios with purchase price, charging station availability, and driving range of EVs. The results of market segmentation analysis indicated that the owners of subcompact and compact size cars were primarily affected by the purchasing price while those of mid and full size cars were more sensitive to the charging station availability. By housing type, the charging station availability was the most important factor for the residents of apartment while the purchase price was the most important factor to choose the EVs. These results presented that the EV supply strategy of the automobile manufacturer should be diversified according to the marketing target and the expansion of the public charging infrastructure should be the top priority in the government policy.

Measurements and Numerical Analysis of Electric Cart and Fuel Cell to Estimate Operating Characteristic of FCEV (연료전지 자동차의 주행성능 예측을 위한 전기자동차 및 연료전지의 성능실험과 수학적 모델링)

  • Cho, Yong-Seok;Kim, Duk-Sang;An, Seok-Jong
    • Transactions of the Korean Society of Automotive Engineers
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    • v.14 no.5
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    • pp.65-72
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    • 2006
  • In new generation vehicle technologies, a fuel cell vehicle becomes more important, by virtue of their emission merits. In addition, a fuel cell is considered as a major source to generate the electricity for vehicles in near future. This paper focuses on modeling of not only an electric vehicle and but also a fuel cell vehicle to estimate performances. And an EV cart is manufactured to verify the modeling. Speed, voltage, and current of the vehicle and modeling are compared to estimate them at acceleration test and driving mode test. The estimations are also compared with the data of the Ballard Nexa fuel cell stack. In order to investigate a fuel cell based vehicle, motor and fuel cell models are integrated in a electric vehicle model. The characteristics of individual components are also integrated. Calculated fuel cell equations show good agreements with test results. In the fuel cell vehicle simulation, maximum speed and hydrogen fuel consumption are estimated. Even though there is no experimental data from vehicle tests, the vehicle simulation showed physically-acceptable vehicle characteristics.

A Study on the Application of Phase Change Material for Electric Vehicle Battery Thermal Management System using Dymola (전기자동차 배터리팩 열관리시스템에서 상변화물질 적용에 관한 고찰)

  • Choi, Chulyoung;Choi, Woongchul
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.66 no.12
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    • pp.1889-1894
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    • 2017
  • Global automobile manufacturers are developing electric vehicles (EVs) to eliminate the pollutant emissions from internal combustion vehicles and to minimize fossil fuel consumptions for the future generations. However, EVs have a disadvantage of shorter traveling distance than that of conventional vehicles. To answer this shortfall, more batteries are installed in the EV to satisfy the consumer expectation for the driving range. However, as the energy capacity of the battery mounted in the EV increases, the amount of heat generated by each cell also increases. Naturally, a better battery thermal management system (BTMS) is required to control the temperature of the cells efficiently because the appropriate thermal environment of the cells greatly affects the power output from the battery pack. Typically, the BTMS is divided into an active and a passive system depending on the energy usage of the thermal management system. Heat exchange materials usually include gas and liquid, semiconductor devices and phase change material (PCM). In this study, an application of PCM for a BTMS was investigated to maintain an optimal battery operating temperature range by utilizing characteristics of a PCM, which can accumulate large amounts of latent heat. The system was modeled using Dymola from Dassault Systems, a multi-physics simulation tool. In order to compare the relative performance, the BTMS with the PCM and without the PCM were modeled and the same battery charge/discharge scenarios were simulated. Number of analysis were conducted to compare the battery cooling performance between the model with the aluminum case and PCM and the model with the aluminum case only.

The Use of Computer Simulation in the Selfdischarge Evaluation of Ni/MH Battery for Electric Vehicle (전기자동차용 Ni/MH Battery의 자기방전율 평가를 위한 컴퓨터 시뮬레이션의 활용)

  • Jung Do Yang;Kim Myung Gyu;Park Seong Yong;Kim Sun Wook
    • Journal of the Korean Electrochemical Society
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    • v.4 no.2
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    • pp.53-57
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    • 2001
  • When an EV is parked for a long period time, the battery capacity naturally decreases due to selfdischarge. Therefore, this effect must be considered for the accurate measurement of the state of charge of EV battery. Battery selfdischarge simulations using the design of experiments among computer simulation methods are compared with experimental data for Ni/MH batteries for electric vehicles. The motivation is to predict the selfdischarge rate of the battery for electric vehicle at all temperature conditions and standing time when electric vehicle could be operated. We developed a general equation representing the seudischarge rate of the electric vehicle battery using design of experiments, and the equation is determined by temperature and standing time of the battery. We selected Ni/MH battery, 12 V-95 Ah, for pure electric vehicle for this study. ID develop the equation using design of experiments we selected temperature range of $-20^{\circ}~30^{\circ}C$ and standing time of 1 day$\~15$ days. We conducted several selfdischarge tests of Ni/MH battery to verify the integrity of the equation. The results showed that the computation values were in good agreement with experimental data.

A study on the Chopper Control System of Electroic Vehicle (전기자동차의 쵸퍼제어 방식)

  • Chung, Y.T.;Han, K.H.;Kim, Y.J.;Lee, S.H.;Kim, D.G.;Lee, W.K.
    • Proceedings of the KIEE Conference
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    • 1992.07b
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    • pp.1182-1184
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    • 1992
  • In case of chopper control is used for the d.c motor In the electric vehicle(EV) in general step down chopper is used for the driving and the step-up chopper is used for the regeneration. Bilateral variable ratio chopper system(BVRCS) formed by parallel combination of upper two chopper methods step-down, step-up and step-up/down chopper operations by duty cycle, circuit element and driving condition. In this paper, BVRCS is proposed for the simulated and experimented control of d.c motor in the EV. By the result of simulation BVRCS represents same driving power compared to the step-down and excellent breaking power compared to the step-up chopper system because of the greater motor current.

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Performance Characteristics of Electric Powertrain Parts for Power Split Type HEV at Steady Speed (Power Split Type HEV 차량 정속주행시 전기동력부품 성능특성)

  • Kim, Chai-Won
    • Transactions of the Korean Society of Automotive Engineers
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    • v.15 no.2
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    • pp.182-186
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    • 2007
  • This paper studied performance characteristics of hybrid automotive to replace existing fossil fuel vehicles. Specially, about power split type HEV that is T-HEV's drive system when a vehicle drives at steady speed, monitored both output of each engine, motor and generator and battery SOC (state of charge) and analyzed performance characteristic of power transmission system and electricity power parts. This study shows those that acquired and analyzed information from signals between HCU and each controller of actual T- vehicle. From this study, it is confirmed that each conditions of EV and HEV drive can be a improvement with respect to the fuel efficiency of vehicles.

Grid service using Vehicle-to-Grid (V2G를 이용한 전력계통 서비스)

  • Lee, Hyun-Goo;Sohn, Hong-Kwan;Ha, Tae-Hyun;Bae, Jeong-Hyo;Kim, Dae-Kyeong;Lee, Sung-Joon;Kim, Sung-Cheol
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.141-142
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    • 2011
  • The increase in oil prices and the rising environmental concerns are boost the electric vehicle supply. Vehicle manufactures understand this trend quite well and plan to increase the production of electric vehicle(EV) such as Nissan LEAF and GM VOLT etc.. The growth of intermittent renewable energy sources such as solar and wind power requires utilities to find additional grid coupled energy storage and regulation capacity. EVs have a battery pack and a charger. The charger can be able to deliver power back to the grid from the vehicle's battery as well as charge the battery. The concept of deploying EVs to stabilize the electric power grid is generally referred to as Vehicle-to-Grid(V2G). We present the grid service using V2G.

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