A Software-Based Gain Scheduling of PID Controller

Abstract

In this paper, a scheduled-gain SG-PID controller using LabVIEW-based scheduling technique, which consists of a set of virtual instruments, has been designed and experimentally tested for heating process. Gain scheduling is realized by automatic setting of the controller parameters using three sets of programmed parameters, depending on the relative error between actual process temperature and setpoint (desired temperature). Experimental results show that the proposed controller, compared with conventional C-PID controller, responds faster to the changes in the setpoint temperature, reduces the overshoots in temperature during transient period and makes the system more stable. It was noticed that the dynamic and steady-state errors in the system have been reduced.