One-Parameter Method for a Multiloop Control System Design

A multiloop control system can be designed with the independent design method by assuming trial controllers with design parameters and adjusting the design parameters so as to satisfy stability and performance bounds. Various stability and performance bounds have been available and were studied for less restrictive ones. On the other hand, little attention has been paid to trial controllers even though they greatly affect the final control performances. Controllers with one design parameter are the usual choice. Here, a one-parameter method for 2 × 2 multiloop control systems is extended to higher dimensional processes in which the design parameter is the time constant of the set point response of the paired output. Control performances are compared with the well-known biggest log modulus tuning method and the sequential autotuning method.