Validation of On-board In-cylinder Wall Heat Transfer Model of CI Engines Using Measurements of Wall Temperature

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  • ディーゼル機関における筒内壁温度計測によるオンボード用壁面熱伝達モデルの検証
  • ディーゼル キカン ニ オケル ツツ ナイヘキ オンド ケイソク ニ ヨル オンボードヨウ ヘキメン ネツ デンタツ モデル ノ ケンショウ

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Abstract

For improvement of thermal efficiency of diesel engines, it is effective to control the fuel injection timing and quantity by using the model-based control (MBC) on ECU (on-board) with cycle-by-cycle calculation. The authors previouslydeveloped an on-board in-cylinder wall temperature prediction model and wall heat transfer prediction model those area part of models for MBC. The present study measured the time evolution of local wall temperature and heat flux in thecombustion chamber to evaluate the models. As a result of the wall temperature prediction model, it was made clear thatthe maximum error was 1.3% at the liner. About the wall heat transfer prediction model, it was shown that the maximumerror of heat flux was 5.8% at liner except for the inner head, and the average error of heat flux was -5.8% at the innerhead except for the cavity side wall.

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