模糊控制原理
控制系统采用“双入单出”的模糊控制器[1>。输入量为pH值给定值与测量值的偏差e以及偏差变化率ec,输出量为向加药泵供电的变频器的输入控制电压u。图3—1为模糊控制系统的方框图[2]。控制过程为控制器定时采样pH值和pH值变化率与给定值比较,得pH值偏差e以及偏差变化率ec,并以此作为PLC控制器的输入变量,经模糊控制器输出控制变频器输出频率n,从而改变加药量使pH值保持稳定。
模糊控制器包括输入量模糊化、模糊推理和解模糊3个部分。E和Ec分别为e和ec模糊化后的模糊量,U为模糊控制量,u为U解模糊化后的量。
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