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분위기 조건이 직접분사식 인젝터의 미립화에 미치는 영향
이중순,Lee, J.S. 한국액체미립화학회 2001 한국액체미립화학회지 Vol.6 No.1
Several efforts to meet the exhaust gas regulation have been undertaken by many researchers in recent years. Main researches are on development of design techniques of intake port and combustion chamber, atomisation of fuel and precise control of air-fuel ratio, post-treatment of exhaust gas and so on. Engine technology is changed from PFI to GDI to correspond with exhaust gas regulation. GDI technique makes it possible to preserve lean air-fuel ratio and control accurate air-fuel ratio. Nevertheless, It is not cleared that information of spray characteristics and atomization process are very dependent on fluctuation of pressure and change of temperature in intake stroke. In this study, a constant volume combustion chamber is manufactured to investigate various fluctuations of in-cylinder pressure for injection duration. It is taken photographs of injection process of conventional GDI injector using PMAS. Then, it was verified experimently that ambient conditions as temperature and pressure of combustion chamber have effects on process of spray growth and atomization of fuel.
이종숭(J.S.Lee),김진영(J.Y.Kim),이상무(S.M.Lee),이중순(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.11_1
It is a necessary condition to control the precise air-fuel ratio with real time for the stability of lean burn including transient operating condition as well as other factors as flow of mixture and ignition energy in SI engine.<br/> This study aims to development of software and hardware such as the engine control system and interface. Real time control system is introduced and its characteristics are tested in SI engine. The real time control system was applied to SI engine and the results are shown.<br/>
LBT 연소를 통한 Idling 운전시의 연소안정성 평가
이중순(J.S.Lee),이종숭(J.S.Lee),김진영(J.Y.Kim),하종률(S.S.Chung) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.11_1
It is necessary to discuss lightening engine parts and reducing the friction of sliding parts to improve fuel consumption and combustion stability at idling. Lean best torque combustion which produce maximum power at a lean air-fuel ratio is effective for the reduction of exhaust gas emission and the improvement of fuel consumption.<br/> Accordingly, this study deals with the expansion of lean combustible limitation, the combustion stability and the reduction of idle speed through the analysis of combustion characteristics on the base of the control technique of air-fuel ratio precisely because it does not need to maximum power at idling. The more ISC duty ratio is increased, the more idle speed is increased. On the other hand, the idle speed is decreased by leaning air-fuel ratio. The COV in engine speed is stable within maximum two percent up to 17.6 mixture ratio by the control of ISC duty ratio.
이중순(J.S.Lee),이종숭(J.S.Lee),정성식(S.S.Chung),하종률(J.Y.Ha) 한국자동차공학회 1997 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1997 No.6_1
The purpose of this research is to clarify that ignition characteristics such as ignition energy and discharge pattern have effect upon maximum pressure, maximum pressure appearance timing, IMEP and revolution of engine on the lean burn of mixture. In this paper. We studied relations between discharge performance of ignition energy and extension of lean inflammability by development of High Frequency Ignition System.<br/>