A Study of Engine Out PM Emission Mechanism under Low Temperature Transient Condition and PN Reduction Technology for Direct Injection Gasoline Engines

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  • 直噴ガソリンエンジンの低温過渡PM 発生メカニズムの解明 およびPN 低減技術に関する研究
  • チョクフンガソリンエンジン ノ テイオン カト PM ハッセイ メカニズム ノ カイメイ オヨビ PN テイゲン ギジュツ ニ カンスル ケンキュウ

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The mechanism about in-cylinder phenomena which is the main source of Particulate Matter (PM) emission under low temperature transient conditions before warm-up is analyzed in this study. As a result, a key parameter of the Particulate Number (PN) reduction under low temperature transient conditions is clarified. It can be stated that larger cycle to cycle carryover fuel film on the combustion chamber wall makes higher PN that is clarified in PN evaluation including transient condition. For PN reduction, cycle to cycle carryover fuel film should be considered. Therefore carryover fuel prediction tool has been constructed. And then, counter measures are found from those clarified phenomena.

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