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스마트 교통체계 적용을 위한 배터리 교환형 전기버스의 에너지 소비량 예측 시뮬레이션 검증
김정용(Jeongyong Kim),최웅철(Woongchul Choi),이상준(Sangjun Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In order to reduce development time and effort, predictive simulation methods are widely used for performance estimation and energy consumption of electric vehicles. While the simulation is very important, validation of these estimation is even more important especially for vehicles that has never been built and tested through the real-life prototypes. In the current study, experimental validation of a vehicle, namely, a battery swappable electric bus (smart e-bus) was carried out. Initially, detailed simulations of the vehicle were carried out to establish the base line model of the smart e-bus using a tool of AUTONOMIE developed by Argonne National Lab of the united states. After the completion of prototype development of the smart e-bus, actual driving tests were performed to validate the simulation results under the same driving conditions. With the successful validation of the current simulation model, it would enable us to explore multiple driving conditions under the same vehicle design and ultimately allow us to optimize the best possible eco mode driving strategy in the near future.
배터리 교환형 전기버스의 실제 상황적 주행시험용 테스트베드 구축을 위한 고도 변화를 고려한 주행 패턴 개발
김정용(Jeongyong Kim),최웅철(Woongchul Choi),이상준(Sangjun Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
In the current paper, a method to convert a driving cycle with grade information into a different driving cycle without grade information while conserving the power consumption by the vehicle under the consideration. The main purpose of this conversion is to enable engineers to perform actual vehicle performance tests on a flat proving ground while evaluating more realistic road conditions where grade changes are severe. Especially in the case of Smart e-Bus development, it is crucial to confirm the driving distance of the bus as it will travel along the city area as a public transportation where grade changes are somewhat severe from time to time. While the actual road data can be obtained by the data acquisition mounted on a vehicle, the actual performance tests of Smart e-Bus can not be carried out on the public road as it can cause severe traffic issues during the testing. In this study to develop a driving cycle conversion method, a vehicle energy consumption simulation tool, AUTONOMIE, was used to validate the converted driving cycle. With a converted cycle, as mentioned above, engineers are free to test the target vehicle under more realistic conditions without building the actual special proving ground with grade information.
고도 변화를 포함하는 Driving Cycle에 대한 배터리 교환형 전기버스의 에너지 소비량 분석
김현준(Hyunjun Kim),김정용(Jeongyong Kim),주용호(Yongho Joo),최웅철(Woongchul Choi) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
Eminent changes of worldwide climate patterns due to rapid acceleration of global warming process warns the world to reduce the production of greenhouse gas such as CO₂ in one way or another. Many studies for the major sources of CO₂ have indicated that the automotive industry is one of the major responsible party. With such results, automotive researchers have made great efforts to alleviate the dependency on the hydrocarbon based fuels to reduce the CO₂ production by using alternative fuels or electricity. Among many techniques, electric vehicles attracts huge attention with rapid developments in power electronics and motor technologies as well as a battery technology. While the main electric powertrain technologies such as the power inverter, the motor controller and the traction motor make solid progress, the battery technology is still struggling to provide dependable energy storage system for the electric vehicle. With an obvious megatrend of urbanization, a public transportation system plays an important role in the efficient use of the transportation energy. A battery swappable smart electric bus has been developed to address this public needs as a one of the solution. In this paper, energy consumption of the battery swappable smart electric bus was studied in the real world driving condition with altitude variations. Energy simulations for the driving cycle obtained from the real experiment were performed with and without the grade change information. Furthermore, the comparison between the simulation results and the experimental results to highlight the importance of the use of driving cycles with the elevation changes.
배터리 교환형 전기버스 시스템을 활용한 전력저장장치(ESS)로서의 가능성 분석
김현준(Hyunjun Kim),김정용(Jeongyong Kim),주용호(Yongho Joo),최웅철(Woongchul Choi) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
Remarkable changes of worldwide climate patterns due to rapid acceleration of global warming process warns the world to reduce greenhouse gas such as CO₂. Many studies for the CO₂ issue have indicated that the automotive industry is one of the major factors. For this reason, researchers have made great efforts to alleviate the dependency on the hydrocarbon based fuels to reduce the CO₂ emissions by using alternative fuels or electricity. Among many techniques, electric vehicles attracts huge attention with rapid developments in power electronics and motor technologies. However the battery technology is still struggling to provide dependable energy storage system for the electric vehicle. With an obvious megatrend of urbanization, a battery swappable smart electric bus has been developed as a one of the solution to address the problem In this paper, for the purpose of ensuring the stability of power supply and demand at a particular region when the maximum power demand occurs the battery swappable smart electric bus system is proposed as a solution proven high leverage value as a public sector. As one of the methodology for this, in order to maximize the efficiency of energy use and eliminate the instability of power supply and demand, ESS of the battery swappable smart electric buses utilizing infrastructure of battery swapping system was analyzed for utilization as measures.