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LPG와 Gasoline을 이용한 직접분사식 엔진에서의 성층연소 특성 비교에 관한 기술 연구
유창한(Changhan Yu),전광민(KwangMin Chun) 한국자동차공학회 2003 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
GDI engines are concerned as future promising concept for SI engine because of its stratified charge combustion. However, it still has a few problems for example, NOx, PM and stability during transient operating range. So, a possibility of using LPG(Liquefied Petroleum Gas), which is regarded as clean alternative energy, in a direct injection engine was studied focusing on was studied focusing on performance. In the study and release rate of LPG calculated form pressure data were higher than of gasoline since LPG has higher Q_L_H_V and combustion of LPG was faster than that of gasoline.
Heat Rejection Data를 이용한 PTC (Powertrain Cooling) 성능 추정
민선기(Sunki Min),유창한(Changhan Yu) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is important to consider powertrain cooling performance, when engine is applied to new vehicle. If the performance is poor, engine will be damaged by overheating. But, the development timing of engine is faster than timing of vehicle, it may be difficult to solve the problem. In this study the powertain cooling performance was estimated with some test and calculation data. First, the heat rejection test was conducted. From this test, the heat rejection data at required rpm and load was acquired. Second, coolant flow test was conducted. From this test coolant flow rate to radiator was measured. Then engine torque and rpm was calculated from vehicle load and speed. Vehicle load and speed was calculated from test mode. Then by comparing these data, the powertrain cooling performance was estimated.
GT-Power를 이용한 Dual Variable Cam Phaser(DVCP) 엔진의 Late Intake Valve Closing(LIVC)에 대한 연구
김동수(Dongsoo Kim),유창한(Changhan Yu),류명걸(Myungkeol Ryu),이문식(Moonsig Lee),김숭기(Soongkee Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
The improvement of performance and fuel economy are key goals of engine development nowadays, variable cam phaser system has been widely adapted in order to satisfy them. The variable cam phaser system can improve fuel economy by reducing pumping loss and heat transfer loss. Using GT-power cam duration and parking MOP of DVCP has been optimized from fuel economy and WOT performance viewpoint and engine dynamometer test has been performed to prove the result of GT-power for next generation of mini engine. Key parameters such as residual gas, combustion stability and pumping loss are proposed to be considered for LIVC application.