Abstract
PID control schemes have been widely used in most process control systems for a long time. The Chien, Hrones, and Reswick (CHR) tuning method is well known as one of typical schemes for adjustment of PID parameters. However, undesirable overshoot can occur when using the CHR method, and then the settling time may be prolonged. In this paper, the relationship of PID parameters and a first-order system with a dead time is discussed. A new scheme for adjustment of reference tracking PID parameters for a first-order system with a dead time is proposed, whose settling time is shorter than that of the CHR method. Based on the proposed scheme, PID parameters can be easily obtained from system parameters. The effectiveness of the proposed method is experimentally evaluated by not only computer simulation but also experimental results of a temperature control system.
