基于自主研制的电液式可变气门系统研究了关键参数对气门升程曲线瞬时变化的影响，通过采用特征点来描述气门升程曲线的特征变化，为参数选取提供理论支撑。研究表明：进油相位对特征相位β_d和β_g的影响都存在临界值，且特征相位β_d和β_g随供油压力增大而提前；特征相位β_d不受泄油相位的影响，而泄油相位对特征相位β_g的影响存在拐点；特征相位β_d和β_g都随凸轮转速的增加而延迟。

Based on the selfdeveloped electrohydraulic variable valve system, the influence of key parameters on transient change of electrohydraulic variable valve lift curve was studied. The characteristic points were used to describe the characteristic changes of valve lift curve to provide theoretical support for parameter selection. The research results show that there is a critical value for the influence of fuel intake phase on characteristic phases of β_d and β_g and the characteristic phases advance with the increase of fuel supply pressure. Meanwhile, the characteristic phase of  β_d is not affected by the oil discharge phase, but the oil discharge phase affects the characteristic phase of  β_d with an inflection point. Both the characteristic phases of  β_g and β_g delayed with the increase of speed.