In this thesis, we propose a new method to implement variable valve timing by positioning the angular position of camshaft.The camshaft then drives the valve to track designed trajectory.

• 本文提出一个新构想，透过控制凸轮轴的角位移，便可间接控制汽门的直线位移，让汽门依照事先规划的轨迹运动，实现可变汽门正时。