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。
Experiments conducted with moderate compression ratios (10.4 and 15) and using two modes of HCCI control, i. e. intake heating and NVO (Negative Valve Overlap) received the expected results.
试验在一个专用于HCCI研究的单缸发动机上实施，采用两种中等的压缩比(10.4和15)和两种HCCI模式(进气加热和负气门叠开)，试验结果证实了这种期望。
Experiments conducted with moderate compression ratios (10.4 and 15) and using two modes of HCCI control, i. e. intake heating and NVO (Negative Valve Overlap) received the expected results.
试验在一个专用于HCCI研究的单缸发动机上实施，采用两种中等的压缩比(10.4和15)和两种HCCI模式(进气加热和负气门叠开)，试验结果证实了这种期望。
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