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바이오 디젤엔진의 다단분사 적용시 엔진 성능 및 배출가스 특성에 관한 연구
김형술(Hyung-Sul Kim),이강복(Gang-Bok Lee) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.3
This paper described the effect of multiple injections on the engine performance and emission characteristics in a CRDI diesel engine using Bio diesel blended diesel fuel. In order to investigate the influence of multiple injections in a DI diesel engine, the injection timing was changed the main injection and pilot injection timings. The experimental apparatus consisted of DI diesel engine with four cylinders, multi-stage injection control system and exhaust emissions analyzer. The combustion and emission characteristics were analyzed for the main and pilot-main injection strategies. The combustion characteristics results show that the combustion pressure was smoothly near the top dead center due to the effect of pilot injection. Also, NOX emissions are decreased with pilot injection because the decrease of rate of heat release. However, the soot is increased at early pilot injection and main injection.
이강복(Gang-Bok Lee),김형술(Hyung-Sul Kim) 산업기술교육훈련학회 2012 산업기술연구논문지 (JITR) Vol.17 No.2
As for today s car, an engine collects data from several sensors in order for computer with numerical analysis and control called ECU(Electronic Control Unit) to precisely control engine. Spark Ignition Engine controls in order to possibly display the optimal engine efficiency with the control system for measuring Fuel/Air ratio and with the ignition controller for combustion in proper period. However, it has great influence upon engine performance and noxious-gas emission depending on ignition performance of Spark Ignition Engine. Thus, it is very important to systematically analyze action and its effect of ignition system. Accordingly, this study focused on analyzing influence upon ignition performance according to Power TR(Transistor) in Electronic Control Ignition Unit of gasoline engine. For this, it analyzes this factor experimentally by generating a change in electric current and voltage according to the appearance of executing Power TR and to the malfunctioning in power TR available for occurring generally, and comparatively analyzes ignition performance. Thus, it will be utilized as data available for accurately diagnosing trouble and for monitoring by being connected to Self Diagnostics System in ECU of vehicle.