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피스톤 핀과 링의 코팅 재질에 따른 엔진 마찰력 저감에 대한 시험적 고찰
심대곤(Daegon Sim),김수영(·Suyoung Kim) 한국자동차공학회 2014 한국자동차공학회 학술대회 및 전시회 Vol.2014 No.11
One important development area for better fuel economy is to reduce mechanical friction losses in engine components. Especially the friction reduction of piston assembly of which account for 30-50% of total engine friction is significantly effective method. This paper describes the friction reduction effect of DLC(diamond-like carbon) coatings and ZALC(ZrAlCu) coatings at the piston pin and rings by engine test. In the case of DLC and ZALC coating pin, the friction torque was decreased at all engine speed and the friction reduction effect was good at low oil temperature condition. In the case of DLC and ZALC coating rings, the friction torque was decreased at high engine speed but the friction torque was increased at low engine speed. Test results show that ZALC coating is more effective than DLC coating by 2%.
민선기(Sunki Min),심대곤(Daegon Sim),이문식(Moonsig Lee) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Air flow rate (Cf) and air flow motion in the combustion chamber (Rt & Rs) are effected by the shape of intake port. If the shapes of intake ports of a cylinder head are different, Cf and Rt are different per each cylinder. Different Cf and Rt result in poor fuel economy and high emission. In this study the deviation of intake port is measured at the cylinder heads. The difference between nominal center and real center of intake port seems to effect on the flow coefficient and tumble ration. Also the flow rate and flow motion are studied at the variant shape of intake port condition to confirm the effect of deviation of the shape of intake port. The intake port is modified by attaching tape on the wall of intake port. In case the tumble ratios are similar at the different port condition, it is thought that there are different flow motions in the combustion chambers.
Tilting Test Rig를 이용한 Oil Pan Baffle 설계 최적화에 대한 연구
진찬만(Chanman Jin),심대곤(Daegon Sim),류한희(Hanhee Ryu) 한국자동차공학회 2011 한국자동차공학회 학술대회 및 전시회 Vol.2011 No.11
The engine lubrication system is subject to external factors like acceleration /deceleration, cornering and also to the design conditions of various engine components; Crank train, Valve train, oil pan, etc. Furthermore, with constantly improving engine manufacturing technology, the latest technology such as HLA and VVT can now be applied to the valve train system, and this then requires bigger capacity of a lubrication system. However, Just increasing oil capacity, might rather cause too much air into oil pan, which could lead to oil areation. So to prevent it, proper oil drain system and optimized baffle plate design are needed. We conducted the oil sloshing analysis and oil pan visualization test to understand oil drain phenomenon. And we came up with a few specifications for the best position and size of a drain hole. Among those specifications, we chose one that it meets the standard requirements at the tilting test and we concluded the optimized design of oil baffle plate. At this research, it was surely confirmed that the process of performing oil sloshing analysis, visualizing oil movement and engine tilting test is the effective way to the design of the optimized oil supply system.
신현민(Hyunmin Shin),심대곤(Daegon Sim),임종덕(Jongdeok Im) 한국자동차공학회 2013 한국자동차공학회 학술대회 및 전시회 Vol.2013 No.11
As fuel economy, performance and emission should be greatly increased in development of the engine to meet recent stringent emission regulations, the design of the piston requires mostly fuel economy enhancement by reducing friction and lower inertia by reducing mass and thickness but also thermal durability for high power. The piston’s temperatures in various points were measured using ratio telemetry monitoring system. In this study, the piston temperatures were measured with and without oil jet which is nowadays adapted for recent high power engine and different oil jet targeting and according to engine coolant temperature, oil temperature and EMS parameters such as spark timing, air fuel ratio, TQ transient, to suggest fundamental data for developing engine.
Strip-down Method를 이용한 엔진 각 Component 별 마찰 토크 분석 연구
선혜영(Hyeyoung Sun),심대곤(Daegon Sim) 한국자동차공학회 2010 한국자동차공학회 부문종합 학술대회 Vol.2010 No.5
The performance, fuel economy and even emissions of the gasoline engine can be improved by adopting HLA (Hydraulic Lash Adjustment) and DVCP(Dual Variable Cam Phasing). But Strip-down method test showed increased friction by 30% when HLA and DVCP were applied. To overcome this side effect, the valve spring force and oil pump capacity on the engine friction were optimized in this study. When the valve spring force was decreased by 30% and oil pump capacity was reduced by 20%, the engine friction was reduced by 10% and the fuel economy was improved by 1.5%.
캠커버 배플 플레이트 설계변경에 따른 PCV 오일분리성능에 관한 실험적 연구
민창기(Changgi Min),심대곤(Daegon Sim),강혁진(Hyukjin Kang) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
PCV (Positive Crankcase Ventilation) system recirculates the blow-by gas inside of engine for emission regulation. As the blow-by gas transports oil droplets to air intake system that can result in oil consumption, deterioration of engine durability, engine torque drop and harmful emission, an oil separator with good efficiency is required. In this study, an experimental approach was taken in order to investigate an influence of each design factor of baffle separator to oil pullover through breathing air passage in high load conditions. Transparent cam cover was made to find out the oil pullover to breathing passage. After radical oil reversion phenomenon was observed, pressure distribution in cam cover oil separation chamber was measured in some areas to investigate an influence between pressure drop and oil reversion. As main factor was defined by visualization test and pressure measurement, some alternatives are developed to reduce a pressure drop and oil reversion. The final solution to prevent drastic oil reversion was verified through oil pullover test with catch jar.