专家模糊控制器在液肥流速控制中的应用

Expert Fuzzy Controller in Fertilizer Flow Rate Control

为了提高变量施肥的准确性,要求对液体的流速实现过程控制。为此,设计了一个试验台进行针对性的试验,并根据传感器的特点设计了一种专家模糊控制算法。该算法采用目标变量y(t)的变化趋势来制定控制规则,按照模糊控制器的方式划分小区,在其中应用逻辑控制规则,来构建控制算法,并在偏差较小时,采用Δ2e(k)按照减速逼近设定值r的概念来引导积分。在流速控制试验台上,进行阶跃及过程控制试验,将获取的数据画出曲线。通过试验找出各划分小区的比例或积分系数,并证明该方法在稳压阀工作的范围内,可以用于过程控制。

In precision agriculture,in order to improve the accuracy of variable rate fertilization,requirements for liquid flow must process control. So designed a test- bed,do corresponding test,according to the characteristics of the sensor design an expert fuzzy control algorithm,which adopts the change tendency of the target variable y( t) to formulate control rules. According to the fuzzy controller way of dividing area. In the areas,application logic control rules,to build the control algorithm. When the error is small,Δ2e be used to guide the integral,according to the deceleration approximation the set value. On the test- bed,do the step test,process control test,and then draw the curve by the acquired data.Through the experiments,the proportional and integral coefficients are identified. And prove that the algorithm is,within the scope of the process control.