介绍了可变进气道长度、可变气门升程及可变气门定时等提高充气效率的先进技术。

It introduces some advanced technologies which increase the charging efficiency, such as the variable length of the intake duct, the variable valve stroke, the variable valve timing and so on.

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全可变气门机构能实现发动机配气定时和气门升程的连续可变，是可变气门技术的发展趋势。

Fully variable valve train may realize continuously variable valve timing and valve lift, and so it represents development trend of variable valve technology.

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本文简要介绍了可变气门正时(VVT)及可变升程技术，提出了一种简单而实用的新型凸轮结构。

This paper gives a brief introduction on the technology of variable valve timing (VVT) and variable-lift, and brings forward a new CAM structure which is simple and practical.

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