Discussion and ConclusionĪs highlighted in the first sub-plot of the previous figure, the angular position of the PID system – after the initial transient – is zero (purple and cyan lines). % Print K: 'K= 'įprintf('K = ', K(1), K(3), K(3))įour different cases were run, with both a PD (Partial-Derivative) and a PID system, and two different initial positions:įrom the top: Angular position, angular velocity and value of the control vector as a function of time. Ylabel('Control Vector','fontsize',8,'fontname','tahoma','fontweight','bold') Ylabel('Angular Velocity','fontsize',8,'fontname','tahoma','fontweight','bold') Ylabel('Angular position','fontsize',8,'fontname','tahoma','fontweight','bold') Xlabel('Time','fontsize',8,'fontname','tahoma','fontweight','bold') % hold all % uncomment to overlap plots among differnt run Set(1,'Name', 'Angular position and velocity, control and errors') % Define a boolean variable to print (or not) figures % Define a boolean variable to debug the ode on zdot Global A B K D d Q R % Create global vars

%close all % Close all open windows (uncomment to overlap plots among differnt run) %K(1,3)= 0 % This line can be used to cancel the integral term (PID => PD)Ī second file, called pid_ode.m, is the main script: %. Global A B K D d Q R % import global variables The scriptsĪ first file, called pid_function.m contains the call to the ode45 function: function zdot = pid_function(t,z) I'm not totally sure if there's more information I'm missing since the problem is an engineering one but I'm having a coding issue.This article presents a Matlab script to model a Proportional-Integrative-Derivative (PID) controller in which also a disturbance is present. The ode45 Integrator is used to solve the overall dynamic of the extended system. Here is my function function dFdV= ODESolarMirrors(V, F)į0 = %mol/s I have done this function several times on other problems but for some reason I keep getting a debugging message and I'm completly lost on what's not working since there are no error messages. Hello! I'm working on a chemical engineering problem and using ODE45.

Ode45 matlab