Comparing and analyzing the synchronous control strategy , which brings up the new method to control the double un - symmetry jars proceed synchronously with the combination of proportional valve and servo valve , which forms closed loop control ; basing on the above methods , models are made to get mathematics models of position control system and to analyze system model theoretically by using pid controller , we can realize regulating parameters , minimizing synchronous errors and enhancing the dynamic performances ; the simulink tool box in matlab software is used to imitate the system according to the model , which not only makes the result visual and easy to adjust the parameters in interactive way but also lets us understand the effects of different parameters and optimizes the dynamic properties . the theory of plc control in dshp is discussed after advanced understanding of the system movements . hardware design and general regulation are given on the base of siemens company products s7 - 200 plc 本文根据大量的国内外文献，对研配液压机的工作原理及设计结构进行了简介；对位置同步的控制方法进行了比较分析，提出比例阀和伺服阀复合控制的闭环结构来对非对称双缸进行同步控制电液比例同步控制方案；在此基础上着重对比例阀控非对称缸建模，最后得到位置控制系统的总体数学模型，从理论上对同步系统动态特性进行了分析，并用pid控制器进行参数整定，减小双缸同步误差、提高系统的动态响应性能；其中控制性能的分析借助于matlab软件中的simulink工具箱，由已建立的数学模型形成仿真模型，得到可视化的仿真结果，从而利于交互方式下调整参数，了解不同的参数对系统的影响，优化同步系统的动态性能；在深入了解系统的动作特性后，对plc控制研配液压机的原理进行了探讨，针对siemens公司s7 ? 200型plc给出了硬件设计的总体规划，编制出研配液压机动作控制程序，在编程中着重研究位移传感器与plc的通讯、双缸同步运行的pid控制在plc上的实现及bcd码拨盘输入程序的植入问题。
This project research mainly includes : consummate the design plan , hardware circuit design , software design , the match between control system and electromagnetic proportion , the anti - interference of control system , and etc . the hardware circuit design of singlechip control system mainly includes odd parts of enlarging circuit , a / d change circuit , d / a change circuit etc . adopt the module to design program in software design 课题研究内容主要是包括:控制系统设计方案、控制系统硬件设计、软件设计、系统抗干扰和电源电路设计。系统的硬件采用了模块结构设计,主要是包括采样模块、主控制模块、 a / d转换模块、 d / a转换模块、电液比例阀驱动模块和电机驱动模块等几个部分组成。
The cooling system for engine adopted hydraulic drive and control technology to control the speed of the fan : the chip adjust the control - current of the proportional value , which used in the engine cooling system , to control the speed of the fan . and the size of the control - current is according to the coolant temperature , coolant temperature change rate and target temperature . as for as the hydraulic cooling system we used a motor to drive and control the fan ’ s work or stop according to the temperature of the hydraulic oil 该系统的特点及其实现的功能为:电液混合驱动方式改变了工程机械冷却装置驱动方式单一的缺点,发动机冷却系统采用了电液比例技术控制风扇转速;单片机可以根据冷却液温度、冷却液温度变化率和目标冷却液温度调节液压驱动系统中电液比例阀的控制电流,进而控制液压油的流量,即可以实现冷却风扇转速的连续调节;液压油冷却系统采用了电动机驱动,然后由单片机根据液压油的温度控制电动机的起动和停止。
With the development of test - machine technology , in recent years electro - hydraulic universal material test - machine of the country inside and outside develops three different control modes : electro - hydraulic servo valve ' s control ; adopted the pressure valve ' s control with speed controller ; proportion valve ' s control of wide flux 随着试验机技术的进步，近年来国内外电子液压万能试验机发展了三种不同控制方式：电液伺服阀控制、采用具有速度控制器的压力阀控制和宽流量范围的比例阀控制。
