同时,由于节气门对进气的节流作用,换气过程中的泵气损失明显增加,因此研制一种连续可变配气定时的配气机构,对于发动机节能减排具有十分重要的现实意义。
The technology for the variable valve timing can not only improve the economy and the power of engine , but also reduce engine emissions , so it is valued from beginning .