Use of time-delay actions in the controller design

It is shown that time-delay action can be used in the design of controllers having quick settling-time property. Specifically, when the feedback compensator is implemented by means of proportional minus delay action, the output performance of the closed-loop system can be better in the sense of ITAE index than that of the system which employs a conventional proportional-plus-derivative action. For actual design, a rule of thumb for determining the parameters of proportional minus delay feedback compensator is suggested.