【摘要】 阐述了在发动机上以电磁、电液、电气或其他方式驱动气门 ,实现无凸轮轴气门驱动 ,可以灵活改变气门正时 ,简化发动机结构 ,能有选择地闭缸 ,灵活改变发动机有效压缩比以适应多种燃料要求 ,使发动机获得比采用一般可变气门驱动更多的好处。无凸轮轴气门驱动的主要问题是响应速度不够高、气门落座冲击、能耗过高以及驱动系统复杂昂贵。目前无凸轮轴气门驱动还未达到大规模实用化的程度更多还原

【Abstract】 Camshaftless valve actuation includes electromagnetic,electrohydraulic,electropneumatic and electromechanical types.it could vary valve timing agilely,simplify the engine’s structure,deactivate some of the engine’s cylinders selectively and vary the effective compression ratio flexibly to adapt different fuels.So it could offer more advantages than general variable valve timing.The main problems of the camshaftless valve actuation are long response time, hard valve landing,high power consumption and complex,high priced actuation system.At present there are no camshaftless valve actuation in practical application.更多还原