I am modelling an Automatic Cruise Control model in Simulink. I used the PID block and tuned the parameters by trial and error. Now the tuned PID controller works for input speed ranges from 40 kph to 165 kph. The problem is that when I enter the desired speed value to be less than 40 kph, it no longer works!
What could be the problem? Also, as I am using blocks from simscape to build my vehicle model, I don't know the transfer function.