PID Design

Implements autotuning.

Implement Proportional-Integral-Derivative (PID) control applications.
Implements autotuning using the Ziegler-Nichols tuning method. If a plant model does not have delay, Ziegler-Nichols tuning does not work. In this case, the node switches to internal mode control to estimate the system response.
Implements autotuning using the Chien-Hrones-Reswick tuning method.
Implements autotuning using the Cohen-Coon tuning method.
Estimates the response using the internal model control.
Implements autotuning using the Ziegler-Nichols tuning method.