Firstly , the research and development situation of pneumatic servo system in recent years is summed up . meanwhile , the development history and present situation of interrelated control theory is reviewed . considering the cost and the capability of control of phcc servo system , high - speed on - off valves are used as control valves and controlled with pulse width modulation ( pwm ) in this system 论文首先综述了近年来气压伺服系统的研究和发展状况,考虑到气液联控伺服系统的成本和控制的可能性,确定采用气液高速开关阀作为系统的控制阀,应用脉宽调制( pwm , pulsewidthmodulation )方法进行控制。
This mode of valve is a kind of brand - new patent electromagnetic valve developed by this co . , with an electromagnetic block as the auxiliary valve and not directly acting on the switch valve while only through adjusting the force difference between the media to get the switch valve , having lower energy consumption , longer duration , more stable performance etc . notable feratures , compared with the traditional electric valves , and extensively used for various water etc . liquids control system A型阀是我公司开发的一种新型专利电磁阀。电磁块作为辅阀，不直接作用于开关阀，仅调节介质压力差获得开关阀，与传统电动阀相比具有耗能低寿命长性能稳定等显著特点。广泛应用于各种控水油等流质的控制系统。
Fcd . 3 138g : 4ds outer - thread copper pipe union at both ends of the inlet and the outlet this valve uses the principle of two - stage pressure reducing variation and , when to lower the switch valve , the shock from the water pressure to the valve casing shortens the start time of this valve under the highest medium pressure and makes it with the incomparable superiority of energy saving among the pulse - type electric - controlled valves , combining to increase filtered to regulate the discharge function with machine type 该阀采用二级减压变化原理，降低开关阀时水压对阀体等配件的冲击，提高电磁阀的可靠性和工作寿命，缩短了阀在最高介质压力下开启时间，使其在脉冲式电控阀门中具有无可伦比的节能优势，并在接线上采用密封插件，并增加了过滤器和机械式调节流量功能。
Furthermore combine the three digital module of the bus system based on the can2 . 0a communication protocol . then using the pc as the host control node , we complete the universal data electric which is designed by ourselves , the system can achieve the expected results on dynamic and static state . through modifying the management procedure , control program and the outside driving electric circuit , the system can be adaptive to the electric - hydraulic control groupware of any new construction machine 在此基础上设计出了通信适配卡、数据采集模块、数字控制模块和由高速开关阀实现控制的液压试验平台，并采用双绞线把基于can2 . 0a通信协议的三个数字模块组成总线系统，再由pc作为主控节点，实现了基于can - bus的通用数字电液控制系统，用软件实现了pwm信号输出并很好地实现了高速开关阀的控制。
Yet , most existing high speed on / off valves use electromagnet as their electicity - mechanism conversion element , and good performant electromagnets have to be imported from other countries , in such situation , it is difficity to make excelent high speed electromagnet valve made in our country , even if we can make good performant high speed electromagnet valve in our country , it still has the shortcoming of not high enough respond speed , too small placket and big volumeo in this thesis , a new high speed on / off valve is developed based on two types of existing valves , this new valve has higher respond speed , a little big placket and little volume o for the new valve , several main task was made out as below : a ) several types of high speed on / off were first analyzed , then the basic performance of the actuator of the new valve was analyzed 高速开关阀是20世纪80年代发展起来的一种具有响应速度快、抗污染能力强、与电子电路配合好等特点的一个良好的动力放大元件。但是现有的高速开关阀基本上采用电磁铁为电?机转换元件，高性能的电磁铁又基本为进口，难以满足高性能高速开关阀国产化的要求，即使是高性能的电磁铁式高速开关阀，仍存在着响应速度不够大、开口过小、体积较大的缺点。本文在现有两种高速开关阀的基础上，设计了一种新颖的高速开关阀，在提高其动态性能的同时，增大了阀的开口，减小了阀的体积。
