介绍美国ENERPAC公司最新生产的PULSAR VP系列脉冲宽度调制数字比例多路换向阀的结构特征,并对此阀的关键环节——开关液压桥进行了初步的机理分析。通过建立数学模型、仿真分析,阐明了开关液压桥无位移及有位移输出动态特性,为消化、吸收这种新型比例控制元件提供了理论依据。 This paper introduces the structural characteristics of PULSAR VP series pulse width modulation digital proportional directional control valve newly produced by ENERPAC Company in the United States and carries out a preliminary mechanism analysis on the switch hydraulic bridge which is the key part of this valve. Through the establishment of mathematical model and simulation analysis, the dynamic characteristics of the switch hydraulic bridge without displacement and displacement output are clarified, which provides a theoretical basis for digestion and absorption of the new proportional control element.