Abstract

This paper investigates the tuning of PD-PI, PI-PD, and 2DOF-4 controllers from the second generation of PID controllers when used to control the injection velocity of a full-electric injection molding machine. The controllers are tuned using MATLAB optimization toolbox and ITAE performance indices. The tuning results are presented and applied to generate unit step time responses for both reference and disturbance inputs. The disturbance rejection associated with the proposed controllers is improved through a special technique used by the author. The characteristics of the step time responses are compared with those of a PI conventional controller from the first generation of PID controllers. The best controller for both reference and disturbance inputs is assigned.