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피스톤링의 회전운동이 오일소모에 미치는 영향 - 제2보- : 링갭의 위상각과 오일소모와의 관계 -
민병순(Byungsoon Min),김중수(Joongsoo Kim),오대윤(Daeyoon Oh),최재권(Jaekwon Choi),진준하(Joonha Jin) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.5
In order to understand the relationship between the phase angle of piston ring and oil consumption, the ring rotation and instantaneous oil consumption were measured at the same time. The ring rotation was measured by radio-tracer technique. The instantaneous oil consumption was measured by analyzing CO_2 concentration in exhaust gas. The use of hydrogen fuel not gasoline makes this possible because all of the carbon component in exhaust gas can be assumed to be produced from oil. As a result of experiment, it is known that the oil consumption varies periodically and a specific location of ring end gap was found at each peak of oil consumption. Therefore, it was found that the oil consumption was not constant even at the same operating conditions and this is because the relative locations of top and 2'nd ring end gap change arbitrarily.<br/> <br/>
민병순(Byungsoon Min),김인섭(Ilnsup Kim),김석준(Seokjoon Kim),이종호(Jongho Lee),이수방(Soobang Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Benchmarking is necessary for every development. Especially, its importance is emphasized in system like hybrid vehicle in which diverse parts operate complexly and make a result. Many optimization methods are used to map out driving strategy as pre-process for making driving control logic. In addition to the optimization the reverse engineered strategy of the competition vehicle with similar architecture is also used to build control logic. In this paper, optimization method, experiment data of competition vehicle, and reverse engineering process and the result of assuming driving strategy are addressed. The measurement technology to see what's happening in the competition vehicle was developed experimental results. Based on the experimental results a simulation model was built and validated.
민병순(Byungsoon Min) 한국자동차공학회 2000 한국 자동차공학회논문집 Vol.8 No.5
In order to clarify the final process of oil consumption, the distribution and flow of oil through each ring were visualized by induced fluorescence method. Motoring and firing test were perfonned in a single cylinder research engine with transparent cylinder liner. The appropriate calibration techniques were used to solve the unstability of induced light intensity as well as to know the relation of the oil film thickness and output signal. Oil behavior was also observed at dynamic state by high speed CCD camera.<br/> By analyzing the oil film thickness converted from the photographed image, it was observed that the main route of oil transport through each ring is the end gap under the usual operating condition, low engine speed and low load condition. Oil film thickness is observed to be irregular and tend to move in a body horizontally at a given piston land. And it is also found that oil flows through oil ring gap so quickly that it can be observed in a single cycle, but it flows so slowly through top and 2nd compression rings that it takes quite a long time to detect the flow.
[가솔린엔진부문] 피스톤 랜드 부에서 오일거동의 가시화
민병순(Byungsoon Min) 한국자동차공학회 2000 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
In order to clarify the final process of oil consumption, the distribution and flow of oil through each ring were visualized by induced fluorescence method. Motoring and firing test were performed in a single cylinder research engine with transparent cylinder liner. The appropriate calibration techniques were used to solve the unstability of induced light intensity as well as to know the relation of the oil film thickness and output signal. Oil behavior was also observed at dynamic state by high speed CCD camera.<br/> By analyzing the oil film thickness converted from the photographed image, it was observed that the main route of oil transport through each ring is the end gap under the usual operating condition, low engine speed and low load condition. Oil film thickness is observed to be irregular and tend to move in a body horizontally at a given piston land. And it is also found that oil flows through oil ring gap so quickly that it can be observed in a single cycle, but it flows so slowly through top and 2nd compression rings that it takes quite a long time to detect the flow.<br/>
주행 상황 예측을 통한 하이브리드 차량의 연비 향상 기술 개발
민병순(Byungsoon Min),박태식(Taesic Park),김인섭(Insup Kim),서범주(BuhmJoo Suh),이재헌(Jaeheon Lee),김석준(Seokjoon Kim) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
It is well known that the hybrid electric vehicle (HEV) which can improve the efficiency of power train by the control of electric power source has better fuel economy than the conventional vehicles. However, the electric power source can be limited because of stability of PE components and continuity of control satisfying any driving condition so that the fuel economy may be lowered according to driving condition. At this moment, if the driving condition such as road and traffic condition can be predicted, the use of electric power source will be controlled appropriately in order to improve the fuel economy of HEV. For example, if a hill road is expected in a few minutes, the controller of HEV will charge a battery sufficiently in order to avoid operating at full load part of engine as driving on the uphill road. When the vehicle is expected to drive downhill, the battery of HEV will be discharged to low SOC so that the battery is more charged from regenerative braking than a HEV with normal control strategy during downhill. Consequently, the fuel economy of HEV is improved. Additionally, while the vehicle is predicted to meet congestion, charging the battery and discharge during congestion improve the efficiency of vehicle. This paper proposes the fuel economy improvement technique for hybrid electric vehicle by using driving condition prediction. The effectiveness of the algorithm and method for using driving environment prediction has been confirmed by PSAT simulation as well as driving test. After collecting the GPS data of a specific route, the improvement of fuel economy is confirmed by using simulation model of Sonata Hybrid at PSAT and by fleet test of Sonata HEV.