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마그네틱 팬 클러치의 지능형 제어를 통한 대형디젤차량의 연비개선효과
고현상(Hyeonsang Ko),위효성(Hyoseong Wi),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
Driving power reduction of engine accessories, is one of methods to improve vehicle fuel economy. As a result of the field test by former researchers, accessories of the commercial vehicle engine account for 1.06% in accordance with energy consumption rate. Especially, rate of the cooling fan occupies 0.29%. In this study, new control algorithm of the magnetic cooling fan clutch is suggested and analyzed concerning improvement of the vehicle fuel economy. Effect of engine coolant temperature increase is obtained as a result of changing the operating time and temperature field of magnetic cooling fan clutch. using this methodology, 0.31% enhancement of vehicle fuel economy can be achieved. It is sufficient for Commercial vehicles to get 0.31% of the fuel economy advancement owing to considerable yearly vehicle mileage.
배전용 가스절연개폐기 부분방전 진단의 적정 주파수 분석
고현상(Hyeonsang Ko),윤성호(Seongho Yoon),김정태(Jeongtae Kim) 대한전기학회 2019 전기학회논문지 Vol.68 No.11
In order to improve the accuracy of partial discharge diagnosis by distinguishing internal partial discharge and external noises in distribution grade SF6 gas-insulated switchgear, partial discharges were measured for the on-site operated switchgears. Floating discharges due to water immersion defect in bushing, SF6 gas leakage defect, poor conductor-contact defect etc. were considered as internal discharges, and discharge by peeling semi-conductor paint in bushing was considered as external discharge. As a result, the main frequency bands of internal and external discharges were identified, and it was proposed that frequency bands of the partial discharge sensor would be designed in the range from 250MHz to 350MHz for detecting internal partial discharges.
무단변속기에 의한 FTP-75 모드 연비 기여도 및 개선효과 분석
김현우(Hyeonwoo Kim),안동환(Donghwan Ahn),고현상(Hyeonsang Ko),박진일(Jinil Park),이종화(Jonghwa Lee) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
A study of AT(auto-transmission) is continuing to improve the fuel economy and powertrain performance with multistage technology in a lot of car companies. But an AT has a problem with stage limit. So a research of CVT(continuously variable transmission) which can drive on the ideal driving condition is going on until nowadays. Further more among these researches, an fuel economy improvement effect analysis is needed when an AT is replaced a CVT, Although a lot of time and money is required in this study simulation can reduce them. In this paper, we analyzed the fuel economy improvement effect when CVT installed on a gasoline vehicle instead of an AT. For this study, we took a FTP-75 mode on chassis dynamometer and analyzed the energy flow down in the CVT vehicle. And we composed modeling and did the simulation by AVL CRUISE based on the results of CVT vehicle analysis data. As a results, it could be accomplished 7.5% improvement of fuel economy when CVT replaced an AT.