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박정희(Jeonghee Park),이창하(Changha Lee),권혁률(Hyuckryul Kwon),김치명(Chimyung Kim),박용선(Yongsun Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
In the fuel cell vehicles, there is usually a falling-off in durability caused by the inflow of air into a cathode area when the stack is down. In this study, the air cutoff valve was developed which could block the air passage to ensure the durability of the stack. Unlike a typical valve, it is important to secure the stability for preventing malfunction in the operation. And it must operate normally when the exhaust gas containing much moisture is frozen around the valve by the low temperature in winter. A valve satisfying conditions above was designed in this study. Then, some tests were carried out on a test rig and a vehicle to verify the improvement of durability of a fuel cell stack.
권혁률(Kwon, Hyuckroul),박형근(Park, Hyungkeun),김성균(Kim, Seongkyun),김치명(Kim, Chimyung),박용선(Park, Yongsun),황인철(Hwang, Inchul) 한국신재생에너지학회 2005 한국신재생에너지학회 학술대회논문집 Vol.2005 No.06
본 개발의 목적은 연료전지차량에 탑재되는 연료전지 시스템에 장착될 공기공급기를 개발하는 것이었다. 개발된 공기공급기의 형태는 공급해야 할 공기의 유량과 압력 범위, 소음 및 향후 양산성 등을 고려하여 원심형 블로어를 선택하였으며, 차량 부하에 따른 공기공급량을 제어하기 위한 제어기도 적용되었다. 또한 차량에 적용될 경우, 예상되는 가혹한 사용환경에서 안정적인 성능을 발휘하고, 내구성을 할 수 있도록 설계되었으며, 특히, 외기온도 45?C에서도 충분한 방열성능을 갖도록 모터 및 모터 방열구조를 설계하였다. 이를 위하여 공급되는 공기로 직접 모터를 냉각하는 개념을 적용하였다. 개발된 터보블로어의 응답성을 포함한 성능평가를 수행하였으며, 설계점에서 600시간 연속운전을 통하여 기본 내구평가를 완료하였다.
화상처리기술을 이용한 연료전지 스택의 유동/열전달/성능 단순화 해석 기법 개발
김정익(Jungik Kim),임철호(Chulho Yim),박용선(Yongsun Park) 한국자동차공학회 2014 한국자동차공학회 부문종합 학술대회 Vol.2014 No.5
A fuel cell stack has a large number of long and narrow channels for reactant gases and coolant. If these channels are modeled by conventional CFD methods, the memory and time required to solve the fluid dynamics and performance of a fuel cell stack become impractically large. Image processing techniques have been introduced to generate a simplified model of the flow channels, resulting in significantly reduced solving times. This novel modeling method enables the numerical analysis of fluid dynamics, heat transfer, and performance estimation of a whole fuel cell stack composed of more than 300 cells. The results of this research will be used to determine design parameters and operating conditions of fuel cell stacks.
연료전지 자동차 스택 냉각 시스템 성능 향상을 위한 해석적 연구
이호성(Hoseong Lee),원종필(Jongphil Won),조중원(Choongwon Cho),이동혁(Donghyuk Lee),박용선(Yongsun Park),김성균(Sungkyun Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Analyses in stack cooling system for fuel cell electric vehicle(FCEV) has been performed. The amount of heat discharge for FCEV stack cooling system is approximately up to 2 times more than that for conventional internal combustion vehicle due to low temperature difference between coolant inlet and air inlet. This paper investigated stack cooling performance of FCEV by means of 3D thermal flow analytic software, UH3D, at the severe condition for cooling, such as high ambient temperature, low vehicle speed and up-hill mode. As a result of 3D simulation, it was estimated that applied FCEV stack cooling system required more heat rejection to cope with this simulation. To improve cooling capacity, several case studies, such as cooling module layout(up and down), a gap between a condenser and stack radiator, distance between stack radiator and fan, and stack location variation, were simulated. Consequently, it was found that cooling performance was improved by max. 1.2% for 20㎜ gap between a condenser and stack radiator. Cooling performance was influenced by the distance between cooling module and stack and BOP components because the recirculation of heated air through cooling module blocked the fresh air, so that cooling air temperature rised. Hence, when the case of no-stack behind cooling module was analyzed, cooling performance was elevated by about 4% because of no-recirculation and more cooling air flow rate. This simulation for no-stack case was considered by the current FCEV developing trend, which fuel cell system was located at under-floor.
자동차 공기 블로워용 영구자석 동기 전동기의 위치 추정 오차 보정
신창필(Changphil Shin),이경진(Kyeongjin Lee),이우택(Wootaik Lee),박정희(Jeong-Hee Park),박용선(Yongsun Park) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
In this paper, a novel correction method of position estimation error is proposed to estimate the rotor position of the permanent magnet synchronous motor (PMSM) in conjunction with Hall-effect sensors. The position estimation error is an unavoidable problem in asymmetric placement of the permanent magnet or the sensors, and causes current harmonics and a degradation of the entire drive performance. The method includes a vector cross-product for two unit vectors of back-electromotive-force (EMF) with respect to stator and rotor quantities. and calculates and corrects position estimation error. A performance improvement of the proposed drive system is validated in several experimental results at the steady state and transient state. compared with a conventional drive system with the Hall-effect sensors alone.
서상훈(Sanghoon Seo),권혁률(Hyukryul Kwon),이창하(Changha Lee),박용선(Yongsun Park) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
The interest in the environmental matter and petroleum resources has rapidly increased. The importance of fuel cell system has been studied, and many subsystems for fuel cell must be engineered to support electrical power, to install a fuel cell into a vehicle platform. Especially, it is important to support a high performance air process system, to produce a stable electric power. For the competitive air process system(APS), the APS need to be smaller, highly efficient, and a low noise level system. The noise from APS has badly influenced on comfortable ride, in fuel cell vehicle. In this report, the results of air intake noise test and the countermeasure of noise problem of fuel cell vehicle are described.