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승용 디젤 CRDI 엔진의 연료분사 압력 및 다단 분사가 연소 및 배기 특성에 미치는 영향
이강복(Gangb-Bok Lee) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.12 No.4
This paper describes the effect of the multiple injection and injection pressure on the combustion and emission characteristics in a common rail direct injection(CRDI) diesel engine at various operating conditions. In order to investigate the influence of multiple injections and injection pressure in a diesel engine, the fuel injection timing was showed double at TDC by pilot injections and main injection. The experimental apparatus is consisted of a DI diesel engine with 4 cylinders, EC dynamometer, multi-stage injection and injection pressure control system, and exhaust emissions analyzer. The combustion and emission characteristics are investigated of various injection strategies such as analyzed for the main, single pilot-main, and double pilot-main strategy. The results showed that the average of peak combustion pressure is increased with the increase of injection pressure. Also, double pilot injection has a great effect on reducing NOX emissions because the decrease of peak heat release rates. However soot is increased double by pilot injection compared to single injection. Based on this result, it showed that the combustion and emission characteristics can be improved as the pilot injection timing.