This is a question I have thinked about under a very long time. What are industrial controllers?
From research I found that PID is the most used in the industry. PID controllers are included in classical control. Then Model Predictive Control(MPC) are used as well. MPC controllers are included in predictive control. LQG controllers are used too and LQG controllers are included in optimal control. For nonlinear systems Fuzzy controller are used and Fuzzy controllers are included in nonlinear control.
Then we have two type of controllers left. They are Model reference adaptive control(MRAC) which are included in adaptive control and H-infinity control which are included in robust control.
So my questions for you are: Why are Robust Control and Adaptive Control not used in the industry? Are them both still in a developement stage?
Please. Correct me if I'm wrong. Because I really like Robust Control but I not going to learn it if there is not chance for me to use it in industrial work.