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MFB50 값을 이용한 디젤 엔진의 주 분사시기 Closed-Loop 제어
구태형(Taehyung Koo),유성은(Seungeun Yu),최회명(Hoimyung Choi),민경덕(Kyuoungdoug Min),한경찬(Kyungchan Han),김장헌(JangHeon Kim),권순혁(Sunhyuk Kwon),조성환(Sunghwan Cho) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11
Combustion of diesel engine is very difficult to control due to the combustion characteristic of diesel engine which is compression ignition operated by self-ignition. To improve this weak point and enhance combustion efficiency, sensitive and precise control about operation variables dleing combustion process is needed. In this research, 'Close-Loop Control' is used to accomplish accurate diesel combustion control. At first, control logic is made by ASCET program which controls main injection timing using MFB50 values. Next, experiments at steady state and transient state are fulfilled to correct MFB50 real values to target values in conventional engine. Finally, emission values from controlled mode are evaluated through comparing with uncontrolled mode in real engine operation mode.
디젤엔진의 실시간 연소제어를 위한 연소위상검출 알고리즘개발
오승석(Seungsuk Oh),임종석(Jongsuk Lim),정재성(Jaesung Chung),이강윤(Kangyoon Lee),선우명호(Myoungho Sunwoo),한경찬(Kyungchan Han),유준(Jun Yu),박승일(Seungil Park) 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
In diesel engines, even if fuel is injected at identical time, combustion phase varies depending on operating conditions such as temperature, humidity, and fuel properties. Such deviations of combustion phase are directly related harmful emissions and torque performance, therefore the combustion phase needs to be detected and controlled. In this study, we propose a novel combustion detection algorithm, Difference pressure Heat release using dP term (DHdP) to detect combustion phase in real-time. DHdP is derived from the difference pressure between firing pressure and motoring pressure and detects combustion phase. DHdP shows a strong linear relationship with 50% mass fraction burned (MFB50), which is well-known for a combustion phasing indicator, under different operating conditions. Furthermore, DHdP requires fewer cylinder pressure data and lighter calculation load, so that it is suitable for real-time applications.