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전동식 파워스티어링 용 전자기유도 방식 토크센서 개발에 관한 연구
유광호(Kwangho Yoo),서정욱(Jungwook Seo),반재원(Jaewon Ban),김완일(Wanil Kim),Manfred Bartscht,장현섭(Hyunsup Jang),권도욱(Dowook Kwon),한상휘(Sangwhi Han) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
In this paper, we will present an inductive torque sensor development which could be preferably used in EPS systems. This torques sensor has capability of both input and output side rotary positions sensing with resolution of 0.005deg/0.01deg respectively. Differential angle between two rotating shaft linked by a torsion-bar can be calculated simply using two angle signals by the ECU. Digital output protocol “SENT” interface applied to strengthen noise performance in an automotive environment and diagnosis capability. For redundancy, the torque sensor consists of two sensors which can independently measure both input shaft and output shaft angles. The two sensors are electrically isolated from each other with their own power supply, ASIC, excitation and receiver coils. That means altogether four angles are measured whereby two angles are transmitted via each SENT signal line. This redundancy allows the ECU to crosscheck the signals to be able to detect faults inside the sensor or the wiring harness. Due to its both side angle measurement principle, the most critical performance parameter is a ripple which means output variation with 0-torque input during 360deg rotation. And the ripple parameter can be understood as superposition of offset error, low frequency ripple(LFR), high frequency ripple(HFR) and random noise. Averaged ripple measured from the developed sensors are to be 0.002deg offset, 0.032deg LFR, 0.010deg HFR, which are sufficiently acceptable for stable control of EPS system and good feeling for drivers.
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단축질소 제거공정에서의 N_(2)O gas 발생특성에 관한 연구
황선진,장현섭 경희대학교 자연과학종합연구원 2002 자연과학논문집 Vol.8 No.-
아산화질소는 생물학적 질소제거 공정에서 부산물로서 발생하는 지구온난화 가스이다. 용존산소, 체류시간, C/N비, 질산성 질소와 아질산성 질소의 축적과 같은 많은 인자가 폐수처리시스템에서 N_(2)O 방출을 좀 더 나은 해석을 위해서 연구되어 왔다. 유입 암모니아 농도는 500∼700㎎/ℓ이었고 수리학적 체류시간은 1.5일, 슬러지 체류시간은 20일로 하였다. 이때 암모니아 제거율은 90%이상이었고 단축질소제거공정에서 일반 질소제거공정보다 N_(2)O가 좀 더 많이 방출된다는 것이 이번 연구로 밝혀졌다. Nitrous oxide(N_(2)O) can be emitted as a by-product of nitrogen removal from wastewater. Many parameters such as the concentration of dissolved oxygen, retention time, C/N ratio as a limiting influent carbon source, the accumulation of nitrate or nitrate, have been investigated to gain a better understanding of N_(2)O gas emissions in wastewater treatment systems. The average ammonia oxidation efficiency was over 90% and the influent NH_(4)^(+)-N concentration was in the range of 500-700mg/ℓ. Hydraulic retention time(HRT) was 1.5days and solid retention time (SRT) was more than 20 days in all the bioreactors. A study on releasing patterns showed that higher N_(2)O emission was at a Shortcut Biological Nitrogen Removal process(SBNR) than a general nitrogen removal process.
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