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원하는 엔진 진동 파워 생성을 위한 능동 엔진 마운트용 적응 제어 알고리즘
고영민(Youngmin Go),박영진(Youngjin Park),박윤식(Youn-sik Park) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Variable displacement technology developed to improve the fuel efficiency engine system is going to be widely adopted because fossil fuels are in danger of running out. Variable displacement is the technology which makes 2 or 3 cylinders be deactivated when driving at fixed speed or on a downhill road. If the chassis vibration originated from engine oscillation is changed abruptly due to intentional misfiring of cylinders, it can give driver and passenger unpleasant feeling. So we have to make the vibration characteristics be kept unchanged during engine's operational mode change. We propose an adaptive control algorithm to generate the desired power spectrum modifying the conventional Filtered-x LMS algorithm for active engine mount control. Desired power spectrum may mean the vibration characteristics, such as the information of the frequency and magnitude, when full cylinders are used.
Study of ZnS/CIGS Hetero-interface for Cd-free CIGS Solar Cells
신동협(Shin, Donghyeop),김지혜(Kim, Jihye),고영민(Go, Youngmin),윤재호(Yun, Jaeho),안병태(Ahn, Byungtae) 한국신재생에너지학회 2011 한국신재생에너지학회 학술대회논문집 Vol.2011 No.05
The Cu(In,Ga)Se2 (CIGS) thin film solar cells have been achieved until almost 20% efficiency by NREL. These solar cells include chemically deposited CdS as buffer layer between CIGS absorber layer and ZnO window layer. Although CIGS solar cells with CdS buffer layer show excellent performance, the short wavelength response of CIGS solar cell is limited by narrow CdS band gap of about 2.42 eV. Taking into consideration the environmental aspect, the toxic Cd element should be replaced by a different material. Among Cd-free candidate materials, the CIGS thin film solar cells with ZnS buffer layer seem to be promising with 17.2%(module by showa shell K.K.), 18.6%(small area by NREL). However, ZnS/CIGS solar cells still show lower performance than CdS/CIGS solar cells. There are several reported reasons to reduce the efficiency of ZnS/CIGS solar cells. Nakada reported ZnS thin film had many defects such as stacking faults, pin-holes, so that crytallinity of ZnS thin film is poor, compared to CdS thin film. Additionally, it was known that the hetero-interface between ZnS and CIGS layer made unfavorable band alignment. The unfavorable band alignment hinders electron transport at the heteo-interface. In this study, we focused on growing defect-free ZnS thin film and for favorable band alignment of ZnS/CIGS, bandgap of ZnS and CIGS, valece band structure of ZnS/CIGS were modified. Finally, we verified the photovoltaic properties of ZnS/CIGS solar cells.
박재일(Jaeil Park),황성욱(Sungwook Hwang),이상호(Sangho Lee),고영민(Youngmin Go),서지윤(Jiyoon Seo),윤영식(Youngsik Yoon) 한국자동차공학회 2016 한국자동차공학회 부문종합 학술대회 Vol.2016 No.5
The purpose of this study is to develop the EDA (Emergency Driving Assist) logic that detects and escapes collision situation as ADAS system. The EDA logic uses the ECS (Electronic Controlled Suspension) system without additional weight and cost to improve vehicle safety performance. When collision situation happens, the EDA logic controls variable damping force of ECS system and then the vehicle is increased its yaw-moment toward its intended trajectory. In emergency collision scenario, the EDA logic is confirmed to verify lateral avoidance effect in simulation and vehicle test.
모델 레퍼런스 기반 MDPS 토크 피드백 제어 로직 연구
조정은(Jungeun Cho),권오성(Osung Kwon),안상규(Sanggyu Ahn),박준모(Joonmo Park),고영민(Youngmin Go) 한국자동차공학회 2020 한국자동차공학회 학술대회 및 전시회 Vol.2020 No.11
The MDPS system, which is currently applied in most passenger cars, determines the output of the MDPS motor torque based on the assist map associated with the steering input torque, which is the steering intent of the driver. Also the MDPS employs a feedforward control logic that provides the driver with the appropriate assist force through motor control. However, the feedforward MDPS control logic has several major drawbacks. In order to compensate for these weaknesses, feedback control logic research has been actively carried out to provide steering feel linked to the current load of the vehicle, and to achieve a consistent steering feel in response to changes in vehicle characteristics. In this paper, the results of the research are explained.