...，即会接上活塞，尤其尺寸愈大的吸气气门，其凹槽愈大；追求高性能的摩托车用引擎气门扬升量出现极大的气门重叠（valve overlap）现象，同时压缩比较高，所以，汽缸盖和活塞的距离缩小，因此，气门凹槽常常加大。
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为实现发动机性能、油耗、 排放的最优化，技术上VVT 主要控制下述2 项内容：1) 气门重叠角（Valve Overlap）控制； 汽车技术学院课程综合实践2—课程拓展研究成果 5 2) 进气门正时控制。
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Negative Valve overlap 负气门叠开 ; 由负阀重叠 ; 负阀重叠
valve overlap angle 阀重叠角 ; 阀重迭角 ; 气门重叠角
valve overlap period 气门重叠角
negative valve overlap nvo 负阀重叠
overlap of slide valve 滑阀重叠量
This period of time is known as valve overlap.
这时期被称为气门重叠。
This is called valve overlap. Valve timing and valve overlap vary on different engines.
不同的发动机，其配气相位和气门重叠是不一样的。
Conventional measure to avoid the damage is to install explosion proof equipment in intake pipe besides decreasing valve overlap Angle.
为了避免这种危害，通常采取的办法除了减小气门重叠角外，就是在进气管安装防爆装置。
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