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EVCT对直喷汽油机燃烧和微粒排放的影响

Xie Fangxi,Meng Xianglong,Liu Yu,Li Xiaona,Zhang Yulin, Feng Haizhou

Automotive Engineering（2022）

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Abstract
本文研究了排气门关闭正时(EVCT)耦合点火正时(IT)对火花点火汽油直喷(GDI)发动机在5种不同工况下燃烧、性能和微粒排放的影响.研究结果表明,EVCT的延迟导致燃烧持续期(CA5-CA90)延长和燃烧中心(CA50)延迟.而IT的提前可以提前CA50,缩短燃烧持续期.EVCT结合IT可有效改善发动机油耗和微粒排放,有效燃油消耗率(BSFC)可降低4.66％,微粒总数最多可减少95％.随着负荷或转速的增加,EVCT对微粒排放和燃料消耗的影响减弱.
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