说明：  该MDL主要通过Matlab Simulink实现神经网络的PID控制，两个例子中神经网络模块分别利用Simulink\User-Defined Functions\MATLAB Fcn和S函数方式实现。在S函数中引入T,nh,xite,alfa,kf1,kf2等参数，在S-Function模块的Parameters处予以初始化。并附带了S函数的使用方法，供大家学习Simulink中两种自定义模块的使用方法。
(The MDL mainly through the Matlab Simulink neural network PID control, two examples, neural network module using Simulink\User-Defined, Functions\MATLAB, Fcn and S function way to achieve. In the S function, T, NH, xite, Alfa, KF1, KF2, and other parameters are introduced and initialized at the Parameters of the S-Function module. And accompanied by the use of S function, for everyone to learn Simulink two custom modules in the use of methods.)