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유압시스템의 실시간 상태제어를 위한 퍼지로직 전문가 시스템 모델
이재천(Jaecheon Lee) 한국자동차공학회 2001 한국자동차공학회 춘 추계 학술대회 논문집 Vol.2001 No.5_2
Condition control is defined as the interactive processes of condition monitoring, condition analysis, and condition responses. A model is presented which employs the use of expert systems to achieve real-time condition control of a hydraulic system. The approach focuses on the use of fuzzy logic to achieve machine intelligence to monitor and analyze pre-degradation incipient failure and impending conditions. Also discussed are the corresponding real-time reactive condition responses, coupling system control with condition control.<br/>
TCS 및 EPS를 이용한 샤시 통합 제어 시스템 설계
이재천(Jaecheon Lee),전대식(Daeseok Jeon),황태훈(Taehun Hwang),김일환(Ilhwan Kim),박기홍(Kihong Park),허승진(Seung-Jin Heo) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Most electronic chassis control systems so far have been designed for optimization of its own performance. This, sometimes, has resulted in performance degradation when two or more control modules were operating together. Recently, great R&D effort is being given to judicious integration of individual chassis control systems in an effort to further enhance the overall vehicle performance. In this paper, two integrated control logics - one that integrates the brake and suspension control systems and the other that integrates the brake and steering control systems - have been developed. The main control target of both logics is vehicle dynamics control under critical situations. The two logics were tested under various driving conditions in a reliable simulation environment and their synergetic effects were investigated. The results indicate that the proposed logics can yield better vehicle performance than the cases when the individual chassis control modules work without any integration scheme.
HILS 장비를 이용한 전자비례제어밸브컨트롤러의 개발에 관한 실험적 연구
이명섭(Myungsub Lee),권태황,이재천(Jaecheon Lee),이현철(Hyeoncheol Lee),신행봉(haengbong Sin) 유공압건설기계학회 2009 유공압건설기계학회 학술대회논문집 Vol.2009 No.11
Electronic proportional control valve of the open-loop system control. Recently to improve the precision and hysteresis, closed-loop system is developed by using the control technology. The object of this study is the electronic proportional valve feedback controller. We aleady developed HILS(Hardware In the Loop System) and Modeling of the valve through construct valve S/W. Amplifier and modeling part of valve connect by using NI CRIO. And, made in the from of one board sample. But, valve modeling is a lack. but valve modeling will improve by using the HILS equipment. Furthermore, using the model of the valve amplifier will improve the optimal algorithm.
이명섭(Myungsub Lee),이재천(Jaecheon Lee),허만대(Mandea Hur),김재영(Jaeyoung Kim),이홍범(Hongbum Lee),소윤섭(YoonSub So) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
This study presents the design and manufacture of Vacuum Clutch Booster(NCS). Since engine torque tends to be increased, manual vehicle clutch load is growing. The objective of this study is to reduce clutch pedal load by using clutch vacuum booster. First, the principle of performance about Vacuum Booster was addressed to keep studying and analytic of booster and to get the parameter of booster’s improvement. Second modeling using MATLAB and calcuate a result. Third manufacture of NCS and then dynamic tests was carried. Compare dynamic test with MATLAB Simulation. In the middle part of the simulation was not able to get a good result because of vacuum ratio and Reaction DISC part(parameter K). As a result, A decrease of 3.62kgf pedal load compared with unused booster was achieved. Furthermore, The additional dynamic’s Modeling of Vacuum Booster program by MATLAB make up to for the clutch control part.
이재규(Jaekyu Lee),이재구(Jaegu Lee),이재천(Jaecheon Lee),김대철(Daecheol Kim) 한국자동차공학회 2005 한국자동차공학회 지부 학술대회 논문집 Vol.- No.-
The purpose of this paper is to find the pressure characteristics of a powershift hydraulic transmission system when we shifted the clutch and deal with basic concept of HILS for a powershift hydraulic transmission. that has many nonlinearities because of P-Q diagram and saturation of control. So, actural test is needed when new component or control algorithm is developed but many restrictions will demand. The AMESim and LabVIEW models of hydraulic components in the HILS were used to test and analyze the dynamic characteristics of the powershift hydraulic transmission system, such as the surge pressure and response time. According to experiment results, pressure interface phenomenon results in system unstability and clutch abrasion happened by clutch sliding.
기계적 혼합과 고상법에 의한 LiNiO<sub>2</sub>의 합성과 전기화학적 특성
김훈욱,윤순도,이재천,박혜령,송명엽,Kim, Hunuk,Youn, SunDo,Lee, Jaecheon,Park, HyeRyoung,Song, Myoungyaup 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.5
[ $LiNiO_2$ ] was synthesized by the solid-state method after mixing $LiOH{\cdot}H_2O$ and $Ni(OH)_2$ with SPEX mill. The optimum condition for the synthesis of $LiNiO_2$ was the calcination at $750^{\circ}C$ for 30h in $O_2$ stream after milling for 1 h. The $LiNiO_2$ synthesized under this condition showed relatively large value of $I_{003}/I_{104}$ and relatively small value of R-factor. When $LiNiO_2$ was cycled in 2.7$\~$4.15 V at 0.1C-rate, the first discharge capacity was not very large (145.8 mAh/g) but it showed good cycling performance. When $LiNiO_2$ was cycled in 2.7$\~$4.2 V at 0.1C-rate, the first discharge capacity was large but ,it showed poor cycling performance probably because of the transition of H2 hexagonal structure to H3 hexagonal structure. In addition, when $LiNiO_2$ was cycled in 1.0$\~$4.8 V at 1/24C- rate, the first discharge capacity was very large (257.7 mAh/g) and the discharge capacity increased with the number of cycles.
기계적 혼합과 고상법에 의해 합성한 LiNi<sub>1-y</sub>Ga<sub>y</sub>O<sub>2</sub>의 전기화학적 특성
김훈욱,윤순도,이재천,박혜령,박찬기,송명엽,Kim, HunUk,Youn, SunDo,Lee, JaeCheon,Park, HyeRyoung,Park, Chan-Gi,Song, MyoungYoup 한국세라믹학회 2005 한국세라믹학회지 Vol.42 No.9
$LiNi_{1-y}Ga_yO_2$ (y = 0.005, 0.010, 0.025, 0.050, and 0.100) were synthesized by the solid-state reaction method after mechanical mixing, and their_electrochemical properties were investigated. All the $LiNi_{1-y}Ga_yO_2$ (y=0.005, 0.010, 0.025, 0.050, and 0.100) samples had the R3m structure. The sample with y = 0.025 showed the largest first discharge capacity (131.4 mAh/g) and good cycling performance [discharge capacity 117.5 mAh/g ($89.4{\%}$ of the first discharge capacity) at the 20th cycle]. The first discharge capacity decreased as the value of y increased. The samples with y = 0.010 and y = 0.005 had small R-factor but their cycling performance was worse than that of the sample with y = 0.025. All the $LiNi_{1-y}Ga_yO_2$ samples had smaller discharge capacities than $LiNiO_2$, but their cycling performances were better than that of $LiNiO_2$.