首页|Extremum seeking-based optimal EGR set-point design for combustion engines in lean-burn mode
Extremum seeking-based optimal EGR set-point design for combustion engines in lean-burn mode
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In lean combustion mode, exhaust gas ratio (EGR) is a significant factor that affects fuel economy and combustion stability. A proper EGR level is beneficial for the fuel economy; however, the combustion stability (coefficient of variation (COV) in indicated mean effective pressure (IMEP)) deteriorated monotonously with increasing EGR. The aim of this study is to achieve a trade-off between the fuel economy and combustion stability by optimizing the EGR set-point. A cost function (J) is designed to represent the trade-off and reduce the calibration burden for optimal EGR at different engine operating condi-tions. An extremum-seeking (ES) algorithm is adopted to search for the extreme value of J and obtain the optimal EGR at an operating point. Finally, a map of optimal EGR set-value is designed and experimentally validated on a real driving cycle.
Extremum seekingEGR optimizationLean burn mode
Haoyun Shi、Yahui Zhang、Tielong Shen
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Department of Engineering and Applied Sciences,Sophia University,Chiyoda-ku,Tokyo 102-8554,Japan
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维普
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