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자동변속기 가변 라인압 시스템의 안정성 향상을 위한 해석 및 시험적 검토
손우철(Woochurl Son) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Variable line pressure is important for improving the efficiency of Automatic Transmission. Oil Pump pressure is reduced to a minimum level for any operating condition based on torque requirements. Operation at minimum line pressure is a major factor in reduction of pump loss and the resulting in fuel economy. In this paper, we propose variable line pressure system and the linear modeling of the system for investigating the stability of the valve behavior and the line pressure characteristics.
조세환(Sehwan Jo),손우철(Woochurl Son),황진영(Jinyoung Hwang),위태환(Taehwan Wie) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
The oil pump power loss in transmission efficiency in automatic transmission is an important factor. Because, the pump supply rate at high engine speeds is much greater than the Transmission needs. This paper proposes two-oil pumping system minimizing of flow rate and power demand in the automatic Transmission. In addition, the electric oil pump control method of optimization is proposed. The effect of pumping system was confirmed by experiment. As a result of the simulation, two-oil pumping system is expected to improve both fuel efficiency and acceleration performance.
정연민(Yeonmin Cheong),이주형(Juhyeong Lee),이창욱(Changwook Lee),손우철(Woochurl Son) 한국자동차공학회 2011 한국자동차공학회 부문종합 학술대회 Vol.2011 No.5
Power Loss in a pushing metal V-belt continuously variable transmission is analysed and compared with the experiment. Belt Losses at band-band, band-block and block-pulley interfaces are calculated taking the pulley deflection into account. Other losses at the oil pump, clutches, gears, bearings and seals are included to estimate the total loss of CVT. The predicted loss showed good agreement with the experimental results. Investigation into the influence of the apply pressure of the pulley on the loss showed that the apply pressure should be controlled as low as possible to increase the efficiency of the transmission.
김재현(Kim, Jae-Hyun),윤전화(Yoon, Jun-Hwa),윤성현(Yoon, Sung-Hyun),손우철(Son, Woo-Cheol),김병표(Kim, Byung-Pyo),이민주(Lee, Min-Joo) 동남어문학회 2010 동남어문논집 Vol.1 No.29
The funeral culture on the lower Nakdong River has studied through the analysis on 17 relics of tombs in the Joseon Era around the Nakdong River area. As a result, the main longitudinal axis of tombs showed the most rate of 43% for northeast and southwest, but there are many tombs in northwest - southeast, south-north, and east-west directions. Furthermore, this phenomenon is shown similarly in all 17 relics without any phenomenon to intensely show in one direction only. on the contrary, the number of tombs directly perpendicular to the contour line has the characteristics to directly perpendicular to the contour line for all 531 tombs without 4 tombs parallel to the contour line regardless of the relics. This is the similar phenomenon shown in the tombs of Goryeo that, unlike the earlier Three Kingdoms Era with the tombs parallel to the contour line, the establishment of tomes in directly perpendicular to the contour line was shown to begin in the Goryeo Era to fully settled in the Joseon Dynasty. Furthermore, the head direction is generally toward the mountain peak part with the higher contour line. However, in the process, it preferred the longitudinal axis of south - north. In addition, burial was mostly made for single burial rather than the joint burial for husband and wife together. And, the tomb shapes are mostly Togwangmyo (pit tombs) and Mokgwanmyo(wooden coffin tombs), rather than Hoegwakmyo (lime-soiled mixture tombs). In addition, the length of the tombs is mostly in the range of 150~250cm. And, the relics form the regular shapes to bury with the brass spoons or coins.(Dong-A University)