• Transactions of the Korean Society of Mechanical Engineers B
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• v.35 no.2
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• pp.189-196
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• 2011

Recently, research and development of a hybrid system for passenger cars as well as for heavy-duty vehicles has become more intensive. An electric powertrain system using an electric motor can replace conventional gasoline and diesel engines. The electric motor has a higher efficiency, better acceleration performance, and is more comfortable than conventional powertrain systems; however, new methods for assessing power performance and energy convergence efficiency have to be investigated because the characteristics of an electric motor are entirely different from those of an internal combustion engine (ICE). In this study, an experiment was carried out on a motor (PMSM: Permanent Magnet Synchronous Motor) test bench. One simple driving mode and four other driving modes identified from real-world driving data of a city bus were selected to perform the experiment on the motor test bench. Then, methods for assessing the acceleration performance, energy convergence efficiency, regenerative effect, etc., were investigated. It was found that the energy efficiency of PMSM was about 90% and that 40% of demand energy was regenerated.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.37 no.5
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• pp.601-607
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• 2013

This paper presents the development and validation of a wheel loader simulation model. The objective of doing so is to evaluate the performance of the wheel loader and improve its overall performance using Matlab/Simulink. The wheel loader simulation model consists of 4 parts: mechanical/hydraulic powertrain model and vehicle/working dynamic model. An integrated simulation model is required to evaluate and improve the performance of the wheel loader. It is expected that this model will be applied to fuel economizing, improving the pace of operation by using the hybrid system, and the intelligent wheel loader. The performance of the proposed simulation model has been validated by using Matlab/Simulink to compare the driving and the working experimental data.

• 한국신재생에너지학회:학술대회논문집
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• 2008.05a
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• pp.530-533
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• 2008

배출가스 및 이산화탄소 등 환경규제 강화와 에너지 고갈 문제는 기존의 내연기관, 동력전달장치, 소재 등의 성능 향상과 함께 대체에너지를 사용하는 자동차의 필요성이 증가하고 있으며, 이에 따라 수소연료전지자동차 등의 상용화가 요구되고 있다. 기존 자동차와는 패러다임이 전혀 다른 수소연료전지자동차는 현재 다양한 방향으로 연구 개발되고 있으므로 수소연료전지자동차 관련 평가기술 중 연료소비율 측정방법도 그에 따라 개발되고 진행되어야 할 것이나 현재 국내에 이와 관련한 체계적인 연구가 미미한 실정이며, 국제적인 표준도 현재 설정되어 있지 않은 상황이다. 따라서 현재까지 진행 중인 수소연료전지자동차 연료소비율 측정방법에 대한 기준 동향 및 연구 사례 조사를 통해 관련 연구 계획의 수립과 향후 수소연료전지자동차 연료소비율에 대한 평가기술 도출을 위한 기초 자료로 활용하기 위하여 본 연구를 수행하였다.

• Journal of Institute of Convergence Technology
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• v.5 no.1
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• pp.23-26
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• 2015

The purpose of present study is to analysis the Characteristics of fuel economy and Green house gases due to the driving mode conditions of The hybrid electric vehicle(HEV). HEVs are divided into mild and power types according to the their functions. mild type HEVs are inexpensive because they do not need to implement a pure electric mode. Power type HEVs are more expensive but has also better fuel efficiency. In the present paper, the test results for the gasoline vehicle using FTP-75 mode and HWFET are present.

• 한국신재생에너지학회:학술대회논문집
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• 2006.11a
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• pp.109-112
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• 2006

In the recent studies, various types of multi mode electric variable transmission for hybrid electric vehicle have been proposed. Multi mode electric variable transmission consists of two or more different type planetary gear hybrid powertrain system(PGHP), which can change its power flow type by means of clutches for improving transmission efficiencies. Generally the power flows can be classified into three different types such as Input split, output split nd compound split. In This paper, we present velocity and torque equations of the input-split powertrain and analyze its optimal Performances. There are six combinations of the input-split powertrain, each combination has various lever length. We find optimal planetary gear ratios for fuel economy and acceleration performance, and compare performances of each combination.

• Proceedings of the KIEE Conference
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• 2001.07b
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• pp.1275-1277
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• 2001

Growing environmental and economic concerns have lead to recent efforts to produce more fuel efficient and lower emissions vehicles. Hybrid Electric Vehicles(ab. HEVs) are the most promising designs to reach these goals. In this paper, We present an of a Power Tra the Hybrid Electric Vehicle(at. PTHEV). We int a different concept of PTHEV than in the pr research of PTHEV. This PTHEV includes benefits of serial(Minimum emission and Max efficiency) and parallel(Maximum Power efficiency by direct drive engine) PTHEV. Also mechanism can avoid driving the engine in the speed regions.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2003.11a
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• pp.63-64
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• 2003

원심력집진기는 장치가 간단하지만 집진효율이 낮아 주로 여과포집진장치 및 전기집진장치의 전단에만 사용되는 단점을 가지고 있다. 여과포집진장치는 고효율의 집진성능을 가지고 있지만 유입되는 먼지의 농도를 감소시키기 위하여 전단에 원심력집진기를 설치하게 되므로 설치공간 및 동력비가 과다하게 소요되고 있으며, 높은 압력손실, 낮은 여과속도에 의한 장치면적 증가, 균일한 집진이 어려워 일부 여과포에 집중적인 부하가 걸리게 되는 단점 등을 가지고 있다. 전기집진장치의 경우 압력손실이 적고 대용량에 적용 가능하지만, 여과집진장치에 비해 집진효율이 낮고, 먼지의 종류 및 연료연소조건에 따라 집진효율이 크게 영향을 받는 단점을 가지고 있다. (중략)

• Transactions of the Korean Society of Automotive Engineers
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• v.5 no.3
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• pp.106-116
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• 1997

In this paper, using MATLAB SIMULINK, a generalized design methodology was suggested for multi pass transmission(MPT) by classifying the vehicle power train as prime mover, MPT and vehicle dynamics. This approach enables a designer to investigate the influence of each transmission component by simple combination of system components without changes of overall program. Using the design methodology, a MPT consisting of CVT, 2, clutches and reduction gears was designed for a braking energy regenerative flywheel hybrid vehicle. The CVT is essential in order to connect the engine and flywheel speed with the vehicle speed. For the purpose of smooth clutch operation, control algorithm was suggested by introducing dead zone for the clutch engagement. Using the SIMULINK model, performance of the flywheel hybrid vehicle with MPT was investigated. It was observed from the simulation results that the MPT vehicle showed better fuel economy, 47% than that of AT vehicle, 27% than that of CVT vehicle for ECE-15 driving cycle. Especially destinct fuel efficiency improvement was obtained for city driving cycle requiring more frequent stop and start.

• Transactions of the Korean Society of Automotive Engineers
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• v.8 no.1
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• pp.72-84
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• 2000

To analyze the correlation between drivetrain systems and to optimize the vehicle design with satisfying of the initial design objects, the performance sensitivity analysis through the iterative design procedure must be carried out. In this study, effects of the design parameters for the main components of the parallel type hybrid drivetrain system are analyzed by using the developed method of the vehicle performance simulation, and the basis of the optimal selection of the design parameters from the relation of design constraints and required performances is suggested. In driving control of the parallel hybrid vehicle, power split ratio is the most important factor, and the improved drivetrain system can be constructed through the only change of the algorithm for determination of the power spilt ratio, which is strongly applicable to the driving patterns and the environments. Therefore, Various techniques, such as the change of the weighting factors and the range extended algorithm, are suggested and evaluated in this paper.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.855-861
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• 2008

The development of fuel cell hybrid power system, as a next generation power system for solving the global warming, has been being made actively progress around passenger vehicles. Also, in case of railway vehicles in unelectrified railway line, the adoption of fuel cell hybrid power system is being studied around well-known manufacturers. This paper introduces both the configuration and the control strategy of fuel cell hybrid power system in order to apply to a light electronic railway vehicle having a repeated driving pattern of acceleration, coasting and deceleration and provides simulation results to evaluate their validity.