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- 저자 : Jeasung Chung (검색결과 1 건)
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Development of a Combustion Phase Indicator for Real-Time Combustion Control in CRDI Diesel Engines
Jongsuk Lim,Seungsuk Oh,Jeasung Chung,Kangyoon Lee,Myoungho Sunwoo 한국자동차공학회 2010 한국자동차공학회 학술대회 및 전시회 Vol.2010 No.11
The location of 50% mass fraction burned (MFB50) is known as a good combustion phase indicator because of its close correlations with harmful emissions and fuel efficiency. Nevertheless, since calculation of MFB50 involves a large amount of cylinder pressure data and complex algorithm, it is difficult to be implemented in a real-time engine controller. For this reason, a new combustion phase indicator with a small number of cylinder pressure data and simple algorithm is demanded for real-time combustion control. In this study, we propose a new combustion phase indicator, called the location of 60% normalized difference pressure after peak (NDPap60). The NDPap60 indicates the crank angle position where the normalized difference pressure reaches 60% of the maximum value after peak. The proposed indicator reveals a linear correlation with MFB50 at various engine operating conditions such as main injection timing, injected fuel quantity, fuel-rail pressure and EGR rate changes. Furthermore, the NDPap60 requires about 55% measurement data of cylinder pressure and 18% calculation steps in comparison with the MFB50. Consequently, the NDPap60 demonstrates great potential for applying to a real-time engine controller.
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