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MEMS(MicroElectro Mechanical Systems) 기술로 제작된 VDC(Vehicle Dynamics Control)용 자이로스코프 어레이
김서규(Seokyu Kim) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
This paper presents a gyroscope array with capacitive detection fabricated by MEMS technology. Proposed gyroscope array has comparative advantage in sensitivity, electromechanical noise, and shock survival. Also the number of the gyroscope array can be expandable to the number of n²cells. We test the resonance frequency characteristics of 1, 4, and 9 cells gyroscope array. A quad-cell gyroscope array performance was tested on the rate table within a vacuum chamber. The quad-cell gyroscope shows that the electrical noise equivalent rate is lower than O.O1deg/sec, the sensitivity is 93mV/deg/sec, dynamic range is 100deg/sec, the bandwidth is 16Hz, and its measured cross-axis sensitivity is smaller than 0.2%.
수온조절기의 개변온도가 가솔린 차량의 연비 및 배출가스에 미치는 영향
김서규(SeoKyu Kim),이검수(GumSu Lee),정진우(Jinwoo Jeong),정수진(SooJin Jeong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
Engine thermal management system(TMS) are gaining attention in engine development and calibration to achieve low fuel consumption to achieve low fuel consumption and meet future emission regulation. One of the major TMS strategy for improving fuel economy is operating the engine in high temperatures. Operating the engine in high temperatures not only decrease hydro dynamic friction losses but also decreases the heat flux from combustion chamber to coolant fluid which in turn results in higher overall engine efficiency. This work examines the effect of two different STO(Starting Temperature of Opening) of wax-thermostat, 90℃ and 100℃ of gasoline engine on fuel economy and emission characteristics. In this work, a gasoline SUV car equipped with wax-thermostat was tested under FTP-75 and HWFET mode to examine how thermal condition changes by different STO of thermostat affects fuel consumption and emission characteristics. The test results show for both drive cycles fuel saving due to the application of operating the engine in high temperature by high STO of thermostat is relatively small and amounts between 0.34% and 0.48%. It is also found that the amount of HC and CO emissions from tailpipe tends to decrease with higher engine coolant temperature because of faster catalyst light-off and improved combustion. For further detail investigation, the application of physically based system level computational model will be strongly required.
자동차용 전자식 수온조절기의 감온성능 향상을 위한 그래핀 소재의 적용
김서규(SeoKyu Kim),김용정(YongJeong Kim),정희화(Heehwa Joung),전원일(Wonil Jeon),정진우(Jinwoo Jeong),정수진(SooJin Jeong) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
In this work, graphene platelets were introduced into wax of automotive electronic controlled thermostat for the purpose of enhancing the thermal-conductive and improving response performance. Graphene content in ranging from 10 to 20% was added into and mixed with wax for investigating the effect of graphene contents on the performance of automotive electronic controlled thermostat in terms of response time, hysteresis and melting temperature. The experimental results revealed that graphene content in wax contributed to a reduction of response time and hysteresis of automotive electronic controlled thermostat. As a consequence, important improvement in thermal sensitivity , full lift, melting temperature and hysteresis were obtained. We hope that this study may help further the translation of nano-fluid technology from small-scale research laboratories to industrial application in the automotive sector.
연료전지 차량용 냉각수 온도 제어 밸브의 유동 특성에 관한 해석적 연구
이준용(Junyonng Lee),허형석(Hyungseok Heo),배석정(Sukjung Bae),김서규(Seokyu Kim),권오성(Ohsung Kwon) 한국자동차공학회 2018 한국자동차공학회 학술대회 및 전시회 Vol.2018 No.11
The hydrogen fuel cell is a power source for supplying electric power of an electric vehicle battery. It is possible to solve the mileage problem of the electric vehicle. In the hydrogen fuel cell, the conductivity of electrons changes in accordance with the state of the electrolyte in the stack. Therefore, the thermal management system of hydrogen fuel cell is very important. The wax type thermostat attached to the existing radiator is difficult to sensitively control the temperature of the fuel cell system because of its low control accuracy with low responsiveness. It is necessary to develop a motor-driven valve that can replace wax type thermostat. In this research, we developed a valve which can actively control the temperature of coolant flowing in the stack. A 3-layer bell valve with a single drive shaft controls the flow rates to the components according to the power of the stack. Flow-rate distribution ratio characteristics and flow resistance in the fuel cell system were verified by porous media method applying the flow resistance experiment data of the componests.