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차량용 고 분해능 디지털 MEMS 가속도센서 시스템 IC 개발
유광호(Kwangho Yoo),고형호(Hyoungho Ko),이아라(Ahra Lee),임재상(Jaesang Lim),이상윤(Sang-Yoon Lee),정덕균(Deog-Kyoon Jeong),박민하(Minha Park),장현수(Hyunsu Jang),이정표(Jeongpyo Lee),조동일(Dong-il Dan Cho) 한국자동차공학회 2006 한국자동차공학회 Symposium Vol.- No.-
This paper presents design, fabrication and measurement of a high resolution digital microelectromechanical systems (MEMS) accelerometer system IC. This system IC consists of a MEMS sensing element and a high resolution digital readout circuit. The MEMS sensing element is fabricated using the sacrificial/bulk micromachining (SBM) process. In order to protect the sensing element from environmental changes, wafer level hermetic packaging(WLHP) process is performed. The developed readout circuit offers 32-bit resolution using an 1-bit, 4th-order ΣΔ modulator and a digital decimator/demodulator. The proposed system IC provides a 128-㎐, 32-bit digital output with ±5g dynamic range, 0.52% nonlinearity, and 1.6*10? count/g scale factor.
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.
무선 센서 네트워크 시스템을 이용한 실시간 저수지 댐의 상태평가 시스템
유찬호(Chanho Yoo),김승욱(Seungwook Kim),황정순(Jungsoon Hwang),나기혁(Gihyuk Na),유광호(Kwangho You) 한국지반환경공학회 2018 한국지반환경공학회논문집 Vol.19 No.12
무선 센서 네트워크 시스템은 종래의 계측기술이 가지는 한계인 집중계측방법이 가지는 단점을 보완하여 시설물 전체의 거동을 확인할 수 있다는 장점으로 구조물의 안전진단 및 계측, 물 관리 시스템 그리고 댐 구조물에 대한 관리시스템에 까지 폭넓게 제안되고 있다. 그러나 계측과 동시에 시설물의 상태평가가 가능한 연구는 미진한 실정이다. 본 연구에서는 이러한 기존의 기술적 단점을 개선하기 위하여 시설물의 거동을 파악함과 동시에 안전 등에 대한 상태평가가 가능하도록 무선 센서 네트워크 시스템을 제안하였다. 저수지 댐 시설에 대한 지반공학적 위험인자를 사전에 평가하고, 시설물의 파괴를 유발하는 인자에 대한 한계값을 설정함으로써 위험인자를 측정함과 동시에 인자별로 한계상태를 즉시 평가할 수 있는 시스템을 제안하였다. 본 연구에서는 저수지댐에 대한 표준단면을 이용하여 침투 및 비탈면 활동에 대한 수치해석을 수행하였고, 응력-간극수압 연동 유한차분 수치해석을 수행하여 저수지 댐 구조물에 대한 한계변위를 설정함으로써 즉시 상태평가가 가능하고 측정값을 이용해 회귀분석 함으로써 한계값에 도달하는 시간을 예측할 수 있음으로써 재난, 재해를 사전에 인지할 수 있는 시스템을 제안하였다. The wireless sensor network system has the advantage of confirming the behavior of the entire facility by improving the disadvantages of conventional monitoring system. As a result, it is widely proposed as safety diagnosis and measurement of structures, water management systems, and management systems for dam structures. However, there is a lack of research that can evaluate the condition of facilities such as safety at the same time as monitoring. In this study, it is proposed a wireless sensor network system which can evaluate the behavior characteristics of facilities and evaluate the safety status for improving the technical disadvantages on conventional monitoring system. The geotechnical risk factors for the reservoir dam facility were evaluated and the limit values for the risk factors causing the failure of the facility were set. In other words, the system was set up so that the risk factors can be measured and the limit status can be evaluated immediately for each factor. In this study, numerical analysis is carried out for seepage and slope stability analysis using the typical cross section for reservoir dams. The stress-porewater coupling finite difference numerical analysis is performed for establishing the limit displacement for reservoir dam structures. It is developed a system that can estimate the time to reach the critical value by regression analysis using the measured datas.
자동차 기능안전 표준 ISO-26262에 따른 개발방법 및 EPS용 토크센서 개발에 적용사례
황건열(Keonyeol Hwang),유광호(Kwangho Yoo),서정욱(Jungwook Seo),김완일(Wanil Kim) 한국자동차공학회 2012 한국자동차공학회 부문종합 학술대회 Vol.2012 No.5
In this paper, we introduce functional safety standard ISO-26262 based development process. It is required to change not only existing processes but also organization to correspond to ISO-26262 standard requirements effectively. Development method modification can be summarized following 4 steps. First, adding of new process steps and roles. Second, finding relationships with existing process and roles and applying new steps. Third, applying new development method based on ISO-26262 standard. And finally, changing and adding supporting processes. And we also include case study of torque sensor development based on ISO-2626 for EPS. Major analysis such as hazard analysis and risk assessment, functional/technical safety concept, FMEDA and FIT are discussed to recommend approach to the standard requirements.
동적 중복구조 활용을 통한 조향각 신호 신뢰성 향상 연구
김진우(Jinwoo Kim),유광호(Kwangho Yoo),김건하(Gunha Kim),이후창(Hoochang Lee),정준영(Joonyeong Jeong),이제광(Jekwang Lee),최윤희(Yunhee Choi),박현호(Hyunho Park) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
Steering angle signal widely uses for driving safety system and driver’s convenience system as well as the steering system. According to increased application range, it is important for complex systems to secure steering angle signal reliability. Current steering system uses major voting system by redundancy check for signal reliability. It has advantage of reliability securing. However when increasing redundancy check, calculation device (e.g. ECU) is also increasing processing load. In this paper, dynamic redundancy check has been introduced about simple processing structure for reduce processing load while keeping signal reliability.
3축 가속도센서를 이용한 도로 등판각 및 횡경사각 추정 방법
이후창(Hoochang Lee),윤정운(Jeongun Yoon),김건하(Gunha Kim),유광호(Kwangho Yoo),김완일(Wanil Kim) 한국자동차공학회 2015 한국자동차공학회 학술대회 및 전시회 Vol.2015 No.11
The climbing and road bank angle are the one of the most important information for active safety systems. But unfortunately, it isn’t easy to simply calculate since the angle is estimated from 2axis accelerometer which is also including driving acceleration and lateral slip angle. So current estimation algorithm requires complex equations and many variables from other sensors in order to extract the angles from measured acceleration. In this paper, a new angle estimation method based on 3axis accelerometer has been introduced with relatively simple equations. The performance of new approach has been evaluated by measuring the calculated angles.