多段噴射による筒内噴射式ガソリン機関のノッキング抑制技術の開発

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  • Development of Anti-knock Control Method Using Multiple Fuel Injection in Direct Injection Gasoline Engines
  • タダン フンシャ ニ ヨル ツツ ナイ フンシャシキ ガソリン キカン ノ ノッキング ヨクセイ ギジュツ ノ カイハツ

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Engine downsizing and higher compression ratio attract attention as a method for improving fuel economy of internal combustion engines. Knocking of an engine is one of the critical factors in determining the engine performance in these systems. In this research, a method for anti-knock control in gasoline direct injection engines was developed based on 3-dimensional fluid simulation and experimental approach. It was clarified that hot spots due to residual gas in the combustion chamber contributed to occurrence of knocking, and a method for cooling the mixture using multiple fuel injection was effective to suppress knocking without increasing smoke emission.

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