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Hybrid Electric Vehicle seriously comes into recent car manufacturers related environmental and economic concerns of conventional vehicle. For the alternative power-train and battery cooling system in HEV's, effective thermal management system is needed and many automakers interested in BLOC motor of cooling fans to the overall traction unit's performance. This paper presents the development status of BLOC motor as major parts of power-train and battery cooling fan for HEV. BLOC motor for power-train and battery cooling fan each, is successful designed by using electro-magnetic analysis and prototype BLDC motors are tested. As experimental results, finally efficiency of BLDC motor achieved 85% for power-train cooling fan and 72% for battery cooling fan. The electric cogging noise is significantly reduced by changing skews pitch angle and optimized magnetic shape. These results are satisfied to 1st stage design criteria. Next step, BLDC motors will be development over 90% efficiency with built-in controller.
Thermal Management System of Fuel cell vehicle stack is important technology for improving stack output efficiency and cold start performance. Rapid coolant heating apparatus is device which raise coolant temperature of FCEV stack to help optimized stack temperature level with high voltage electric heaters. In this study, CFD analysis of internal heat and mass transfer characteristics for rapid heating apparatus is conducted and obtain pre-design factors with temperature profile on electric heater surface and velocity profile of coolant flow. With design change of electric heater location and coolant flow distributer, coolant distribution rate is improved within 1.3% between two outlet ports and 200K temperature down effect on heater surface.
Fuel Cell Stack generates enormous heats in the electrochemical process. Generally, the fuel cell stack operates well at a temperature around 65℃ which is lower than the internal combustion engine in the PEMFC vehicle. By using the engine cooling simulation program, we found that the minimum heat capacity of the stack cooling module and air-flow of the fan. The minimum airflow would be 7000 CMH for the 35㎾ of the heat from the stack. We had developed high voltage BLDC motor with controller and high efficiency heat exchanger to solve the problem. But, the Noise of stack cooling fan is very higher than that of ICE vehicle. so, it is necessary to reduce the noise of fan for application to vehicle. This study will present the improvement process of the Stack Radiator which increases the heat capacity and reduces the noise of cooling fan. In the first stage of development we conduct computer simulation including structure analysis. We made the prototype of the cooling module through the results of simulation. Then the performance test was conducted. The results of calorimeter test show that the developed cooling module meets the severe requirements reducing the noise of the cooling fan.
국내에서 DMB 방송은 대부분의 국민이 휴대하는 휴대폰에 수신기능이 구현되어 있고, 차량 네비게이션에서도 DMB 수신이 가능하여 상당히 보편적 미디어 창구이다. 본 연구에서는 DMB기반의 국지적 재난방송은 국지적 재난의 빈번한 발생과 휴대 기기가 갖는 고유의 개인 중심성과 이동성은 국지적 재난 미디어로 활용할 기술 개발은 큰 의미를 가진다. 국지적 재난방송을 위한 DMB 재난방송 서비스 모델과 방송 시스템 상위 설계 및 기술요구사항 도출 등의 연구를 연차별로 진행 하였다. DMB방송 시스템을 운영한 KBS의 경험을 반영하고, 국지적 방송을 위한 저비용의 시스템을 목표로 국지적 재난 정보 전달에 적합한 방송 시스템 상위 설계와 시스템 간 인터페스 및 기술 개발에 필요한 상세 요구사항을 분석하였다. 이러한 연구의 정확성과 실제 상용화 가능성을 높이기 위해 DMB 방송 차량을 이용한 필드 테스트를 추진하였다. 필드 테스트 에서는 KBS 재난방송시스템과 실시간 연동을 통해 향후 실제 재난방송에 활용 될 수 있는 방송 시스템 운용에 필요한 사항 들을 점검하였다.
The aim of this paper was to investigate fluid dynamic behavior characteristics, and effectively to design of air flow rate of the BAT/INV for hybrid electric vehicles (HEV). The BAT/INV for HEV installed in the luggage space of the vehicle and controlled by the battery monitoring system should operated in suitable thermal environmental conditions by means of air supply system. The analysis of the BAT/lNV cooling system has been peformed by applying the computational fluid dynamics (CFD) code, Fluent, to the solution of the 3-D turbulent flow fields. As a results, at design operating condition, air flow rate of the BAT/INV cooling system with the enhanced blower model increased by 30.8%, Q=162. 7 ㎥/h, comparison to it with the base blower model and the efficiency of the blower motor was predicted about 69.0%. In addition to, to minimize pressure loss of the system, the design of the air duct between the BAT/INV was improved.
The aim of this study is to investigate the performance and the fluid dynamic behavior of application of proto electric device’s cooling system for high efficient vehicle in severe driving condition in terms of engine and electric devices’ cooling. In this study, optimum layout of extra heat exchanger for electric device cooling has been simulated and analyzed by 3-D thermal flow analytic software, UH3D. In spite of extra cooling system for high efficient vehicle, cooling module layout is being considered as 2 column due to confined engine room and pedestrian’s protection. For this reason, unified heat exchangers with combination of two kinds of engine/electric device and condenser/electric device were studies to find out better solution in terms of cooling performance. As results of 3D analysis, combination of condenser/electric device cooling heat exchanger is considered as the effective way for a vehicle optimum cooling module because of less influence on condenser heat rejection and more heat transfer area for engine cooling system. From further studies, such as the variation of cooling module location and interval between 2 column of cooling module, additional performance improvement for electric device cooling system seems to be achieved.
The aim of this study is to evaluate the performance of integrated engine/motor cooling system and analyze the battery/inverter cooling system for hybrid electric vehicles(HEV). The prototype integrated radiator for engine/motor cooling was fabricated and the performance was evaluated on the optimum test rig with the variation of coolant flow rate and air inlet velocity. Electrical device cooling system, such as motor and controller, needed to be maintained under 50℃ for thermal stability. Under the certain condition, which inlet temperature difference(ITD) between air and coolant is 20℃, optimum coolant flow rate for electrical device cooling radiator was 10 LPM with heat capacity, 4.5㎾ at air inlet velocity 4㎧. The analysis of the battery/inverter cooling system has been peformed by applying the computational fluid dynamics (CFD) code to investigate fluid dynamic behavior characteristics and effectively design air flow rate of the system for hybrid electric vehicles (HEV). As a result, at design operating condition, air flow rate of the battery/inverter cooling system was 218.0 ㎥/h and the corresponding efficiency of the blower motor was predicted about 70.7%. Furthermore, for the battery/inverter cooling system, the average temperature of the battery was about 42.4℃.