Here is my open loop system.
I run the model and plot it in the workspace
subplot(1,2,1)
plot(FV)
ylim([-1 1.5])
xlabel('time (min)')
ylabel('F/V, 1/min')
title('F/V vs. time')
subplot(1,2,2)
plot(CB)
ylim([-1 1.5])
xlabel('time (min)')
ylabel('C_{B} (mol/Liter)')
title('C_{B} vs. time')
Next, I add a PID controller. P = 1, I = 1, and D = 0 (as per the homework instructions)
I run the output again in the workspace
subplot(1,2,1)
plot(FV1)
ylim([-1 1.5])
xlabel('time (min)')
ylabel('F/V, 1/min')
title('F/V vs. time')
subplot(1,2,2)
plot(CB2)
ylim([-1 1.5])
xlabel('time (min)')
ylabel('C_{B} (mol/Liter)')
title('C_{B} vs. time')
I'm not seeing any response that would indicate a controller, in fact, all that happens is that the concentration of B reaches a higher steady state with the controller. I haven't used a controller before, so I wonder if I am doing something incorrectly. Thanks
As a side note, I also get this message
Warning: Using a default value of 0.2 for maximum step
size. The simulation step size will be equal to or less
than this value. You can disable this diagnostic by
setting 'Automatic solver parameter selection'
diagnostic to 'none' in the Diagnostics page of the
configuration parameters dialog
