摘要
Natural properties of high speed on-off valves can be described through their on-off behavior and spool movement (static and oscillating) characteristics. High speed on-off valves can be combined with actuators in systems into four typical types of composite valves whose static characteristics are related not only to the structures of the single valves and the composite ones, but also to the PWM control modes. It is proved that the composite valves have similar features as those of servo valves. The nonlinear specific properties of single valves composited can be completely compensated by the suitable PWM control modes.
高速开关阀的本质特性可以用开关静特性、阀芯位移静特性和输出微幅振荡静特性来描述．在伺服系统中，高速开关阀与执行元件结合可构成具有典型意义的四种组合式高速开关控制阀体（ｅｌｅｃｔｒｏｈｙｄｒａｕｌｉｃｃｏｎｔｒｏｌｂｌｏｃｋ）．这种组合式控制阀体的静特性不仅与单个阀的结构和间体的组合形式有关，还受其输入信号ＰＷＭ（ｐｕｌｓｅｗｉｄｔｈｍｏｄｕｌａｔｉｏｎ）控制方式的直接影响．理论和实验证明，在适宜的ＰＷＭ控制方式下，四种组合式高速开关阀体均具有与伺服阀类似的特性，并且它的非线性特性可以得到完全补偿．
