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한재영(Jaeyoung Han),이강훈(Kanghun Lee),유상석(Sangseok Yu) 대한기계학회 2011 대한기계학회 춘추학술대회 Vol.2011 No.10
This study presents the mathematical model of thermal management system for automotive PEMFC system using the Matlab/Simulink. The thermal management system of automotive PEMFC system is composed of fan/motor assembly, coolant passages, radiator, and cooling pump/motor assembly. The radiator model is capable of designing detailed geometry. The cooling module model integrated model of fan, coolant passage, and DC electric motor. Motor assemblies of fan and pump are used to explore control strategy of the thermal management system. Coolant inlet and outlet temperatures of PEMFC stack are controlled with operating algorithms of fan and pump within desired temperature range. The control algorithm was evaluated with the PEMFC system model so that the system can be operated at desired temperature. In conclusion, the PEMFC system with load follow-up operation has to be controlled with feedback controlled thermal management system to ensure proper operating temperature.
조재천(Jaecheon Jo),사정환(Junghwan Sa),이강훈(Kanghun Lee),이윤권(Yoonkwon Lee),이기주(Kiju Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Failure of the exhaust pipe can cause air pollution by reducing ability of exhaust gas purification and can cause noise pollution and ride quality degradation by reducing ability of noise isolation. Therefore, it should ensure high reliability of the product to meet the growing environmental regulations and the needs of consumers. However, under actual conditions of use, it spends a lot of time and cost in order to develop products of high reliability. Therefore, accelerated life test to estimate the relationship between stress and life is performed to predict the actual life from the observed data through tests of the product by promoting the failure of products in severe conditions than real use conditions. The purpose of this study is estimating lifetime of exhaust pipes through statistical analysis and to evaluate average life in short term. This study was applied by the statistical analysis method of ASTM E739.
열전소자방식 무시동 냉난방시스템의 운전특성에 관한 실험적 연구
양동욱(Donguk Yang),박경민(Kyoungmin Park),이강훈(Kanghun Lee),노윤식(Younsik Ro),김상우(Sangwoo Kim),김무성(Moosung Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
Independent air-conditioning and heating system for commercial vehicles is possible an cooling and heating environment by battery power without mechanical elements and has the important advantages which reduced fuel-price, minimized environmental pollution caused by emissions. In this study, the voltage and current of thermoelectric module, inside & outside temperature of cabin and internal & external temperature of cooling and heating system were measured after setting up anti-start air conditioning system using the thermoelectric element in the real operating condition. In experimental results, when it is measured and analyzed output voltage and current up to cutoff voltage, it is shown that the capacity of battery power is required approximately two times.
유동현(Donghyun Yu),정봉수(Bongsoo Jung),문남수(Namsu Mun),이강훈(Kanghun Lee),한인수(Insu Han),김종일(Jongil Kim),김희진(Heejin Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
Automotive exhaust system is composed of flange connected with exhaust manifold, bellows to absorb vibration of engine and road, muffler to reduce exhaust noise of engine, and pipes. The significant damage factors influencing the exhaust system life are thermal stress due to exhaust gas and repetition of complex load such as bending, torsion and tensile loads from engine and road. RLDA (Road Load Data Acquisition) is preceded to predict exhaust system durability life, but there are several problem like constraint of time and cost. So durability test simulating RLDA data is necessary. In this study, RLDA is performed at a proving ground in order to evaluate durability of exhaust system, and the obtained data is analyzed in order to select the most suitable for simulation durability test.