发动机可变气门正时技术的研究

Study on Variable Valve Timing Technique of IC Engine

利用可变气门正时技术可以有效地提高发动机性能和降低排放 .目前研究重点集中在机械式和非机械式两方面 ,本文对这些成果做了简要介绍。

In order to meet the increasing needs for higher power and torque as well as better fuel consumption and emissions, researchers and engineers all over the world have been throwing into the development of variable valve timing techniques during the pase decades. Their achievments are very encouraging when VVT techniques are applied to intermal combustion engines. Recent emphasis of research are concentrated on two aspects: with cam and without cam. They are briefly presented in this paper. After analyzing resepctive characteristics of both types, we think that camless VVT represents the future trends.