Reformulation of the tangent method for PID controller tuning

Process stability of a PID control loop depends upon the proportional, integral and derivative constants used. Using the conventional tangent method and the proper tuning rule, the optimum P, I and D can be estimated. With this optimum P, I and D set into the controller, an optimum response is normally achieved. A reformulation of the tangent method is proposed where the analysis is made simpler, easier and faster. The reformulated tangent method can be applied with ease to any recording or display devices compared to the existing tangent method as is shown in the experimental study section