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| Extremum seeking-based optimal EGR set-point design for combustion engines in lean-burn mode |
| HaoyunShi,YahuiZhang,TielongShen |
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| (Department of Engineering and Applied Sciences, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan) |
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| DOI：https://doi.org/10.1007/s11768-021-00047-x |
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| Extremum seeking-based optimal EGR set-point design for combustion engines in lean-burn mode |
| Haoyun Shi,Yahui Zhang,Tielong Shen |
| (Department of Engineering and Applied Sciences, Sophia University, Chiyoda-ku, Tokyo 102-8554, Japan) |
| Abstract: |
| 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 conditions.
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. |
| Key words: Extremum seeking · EGR optimization · Lean burn mode |
