中文说明：基于BP神经网络的PID控制器控制一阶惯性加纯滞后的被控对象（加热炉），神经网络结构4-5-3，隐层输出层均使用sigmoid激活函数
English Description：
The PID controller based on BP neural network controls the first-order inertia plus pure delay controlled object (heating furnace). The neural network structure is 4-5-3, and the sigmoid activation function is used in the hidden output layer