基于S7-300的比例阀控液压缸的PID静态补偿控制

分别建立对称阀控非对称液压缸在有杆腔进油和活塞腔进油时的数学模型，使用MATLAB/Simulink分析液压系统在这两种进油情况下的动静态特性，结果表明，液压系统在两种进油情况下系统超调量、调节时间、振荡次数等几个方面存在较大差异。为补偿系统这种非对称性，以S7-300 PLC作为控制器的基础上提出了PID静态补偿控制策略。在疲劳加载试验台上对这一控制策略进行试验验证，试验结果表明，采用PID静态补偿策略很大程度上提高了系统的响应速度及精度。

PID Static Compensation Control Strategy of Hydraulic Cylinder Controlled by Proportional Valve Based on S7-300

The mathematic model of the asymmetrical cylinder controlled by symmetric valve is established respectively in the both cases of oil inlet from the rod chamber and oil inlet from the piston chamber. MATLAB/Simulink is introduced to analyze the static and dynamic characteristics of the hydraulic system in both conditions，the result shows that there exists great difference on system overshoot，settling time，oscillation frequency and other aspects of the hydraulic system under this two conditions. To compensate system’s asymmetry characteristics，the PID static compensator control strategy is proposed on the basis of S7-300 PLC as the controller. This control strategy has been tested on the fatigue loading test rig，the test results show that using the static PID compensation strategy can greatly improve the response speed and accuracy of the system.