A new approach for PID controller tuning from closed-loop setpoint experiment

The proposed PID tuning method has similar approach to the recently published paper of Shamsuzzoha and Skogestad (2010). It is one step procedure to obtain the PID setting which gives the better performance and robustness. The method requires one closed-loop step setpoint response experiment using a proportional only controller with gain K_c0. Based on simulations for a range of first-order with delay processes, simple correlations have been derived to give PID controller settings. The controller gain (K _c/K_c0) is only a function of the overshoot observed in the setpoint experiment. The controller integral and derivative time (τ_I and τ_D) is mainly a function of the time to reach the first peak (t_p). The proposed tuning method shows better performance than Shamsuzzoha and Skogestad (2010) for broad range of processes.