一种节能非线性电液伺服系统双层模糊控制方法研究

为了降低电液伺服阀控制系统能量损失,设计了双层模糊控制器,并对电液伺服系统能量进行仿真验证。分析了电液伺服阀模型简图,建立了电液伺服阀动力学模型,推导出比例溢流阀的开启压力与泵压的关系方程式。设计变论域双层模糊控制方法,分别对电液伺服系统负载反馈和输出误差反馈进行在线调节,通过MATLAB软件对控制系统节能效果进行仿真验证,并且与传统PID控制方法进行对比和分析。结果表明:采用传统PID控制方法的电液伺服系统输出误差较大、能量损失较多;采用双层模糊控制方法的电液伺服系统输出误差较小、能量损失较少。采用双层模糊控制方法,能够提高非线性电液伺服系统输出精度,从而有效减小了控制系统的能量损失。

Double Layer Fuzzy Control Method for a Energy-saving Nonlinear Electro-hydraulic Servo System

In order to reduce the energy loss of the electro-hydraulic servo valve control system, a double layer fuzzy controller was designed and the energy of the electro-hydraulic servo system was simulated. The schematic diagram of the electro-hydraulic servo valve model was analyzed, the dynamic model of the electro-hydraulic servo valve was established, and the equation of the relationship between the opening pressure of the proportional relief valve and the pump pressure was derived. The variable domain double layer fuzzy control method was designed. The load feedback and output error feedback of the electro-hydraulic servo system were adjusted online respectively. The energy saving effect of the control system was simulated and verified by MATLAB, and the results were compared and analyzed with that of the traditional PID control method. The results show that the output error and energy loss of the electro-hydraulic servo system using traditional PID control method are large, while the output error and energy loss of the electro-hydraulic servo system using with the double layer fuzzy control method are smaller. The double layer fuzzy control method can improve the output precision of the nonlinear electro-hydraulic servo system and effectively reduce the energy loss of the control system.