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在使用Simulink的过程中经常会遇到一个问题，我希望我自己封装的模块中（一个Mask）的参数实时变化，例如
1.我想要模拟负载电阻突然变化（一开始电阻为2Ω，在1s后电阻变为1Ω）
2.电机运行过程模拟参数实时变化的工况（例如电感随时不断改变）
等等
那么就迫切的需要我们设置的一个参数能随时间实时的改变，那么解决方法可以采用S-funtion模块利用set_param
希望大家有所收获，喜欢本篇文章的话点个 关注 收藏 赞 吧！！！！！！
S-function模块
模块路径
模块
S-function需要在matlab中编程，打开S函数模板方法：在matlab命令行窗口输入 edit sfuntmpl 会打开S函数得模板
S-function模板
function [sys,x0,str,ts,simStateCompliance] = sfuntmpl(t,x,u,flag)
switch flag,
%%%%%%%%%%%%%%%%%%
% Initialization %
%%%%%%%%%%%%%%%%%%
case 0,
[sys,x0,str,ts,simStateCompliance]=mdlInitializeSizes;
%%%%%%%%%%%%%%%
% Derivatives %
%%%%%%%%%%%%%%%
case 1,
sys=mdlDerivatives(t,x,u);
%%%%%%%%%%
% Update %
%%%%%%%%%%
case 2,
sys=mdlUpdate(t,x,u);
%%%%%%%%%%%
% Outputs %
%%%%%%%%%%%
case 3,
sys=mdlOutputs(t,x,u);
%%%%%%%%%%%%%%%%%%%%%%%
% GetTimeOfNextVarHit %
%%%%%%%%%%%%%%%%%%%%%%%
case 4,
sys=mdlGetTimeOfNextVarHit(t,x,u);
%%%%%%%%%%%%%
% Terminate %
%%%%%%%%%%%%%
case 9,
sys=mdlTerminate(t,x,u);
%%%%%%%%%%%%%%%%%%%%
% Unexpected flags %
%%%%%%%%%%%%%%%%%%%%
otherwise
DAStudio.error('Simulink:blocks:unhandledFlag', num2str(flag));
end
function [sys,x0,str,ts,simStateCompliance]=mdlInitializeSizes
sizes = simsizes;
sizes.NumContStates = 0;
sizes.NumDiscStates = 0;
sizes.NumOutputs = 1;
sizes.NumInputs = 1;
sizes.DirFeedthrough = 1;
sizes.NumSampleTimes = 1; % at least one sample time is needed
sys = simsizes(sizes);
%
% initialize the initial conditions
%
x0 = [];
%
% str is always an empty matrix
%
str = [];
%
% initialize the array of sample times
%
ts = [0 0];
% Specify the block simStateCompliance. The allowed values are:
% 'UnknownSimState', < The default setting; warn and assume DefaultSimState
% 'DefaultSimState', < Same sim state as a built-in block
% 'HasNoSimState', < No sim state
% 'DisallowSimState' < Error out when saving or restoring the model sim state
simStateCompliance = 'UnknownSimState';
function sys=mdlDerivatives(t,x,u)
sys = [];
function sys=mdlUpdate(t,x,u)
sys = [];
function sys=mdlOutputs(t,x,u)
sys = [];
function sys=mdlGetTimeOfNextVarHit(t,x,u)
sampleTime = 1; % Example, set the next hit to be one second later.
sys = t + sampleTime;
function sys=mdlTerminate(t,x,u)
sys = [];
set paramo函数及功能定义
语法
说明
示例
输入参数
Simulink仿真
1.建立名为test_S的模型
2.在模型中加入S-function模块
 3.搭建模型
假设我们现在需要一个随时间变化的电感在1s前是2H在1s后变为1H 把参数设为L
4.建立一个Mask
点击建立子系统
设置参数
点击添加参数
prompt可以随意写 Name必须与上面设置的变量名相同！！！！！！
完成搭建
5.S函数编写
按照上面的s模板建立一个名为fortest的函数
单输入无输出仅起着改变系统参数的作用
sizes = simsizes;
sizes.NumContStates = 0;
sizes.NumDiscStates = 0;
sizes.NumOutputs = 0;
sizes.NumInputs = 1;
sizes.DirFeedthrough = 1;
sizes.NumSampleTimes = 1;
参照上面给出的语法编写 模型名/模块名 参数名 赋值
function sys=mdlOutputs(t,x,u)
if u |