A switching scheme for adaptive control using multiple models

Adaptive control of a linear plant using multiple models for the identification is considered. It is assumed that the plant parameters are either partially known or subject to abrupt changes. A switching scheme is proposed for improving the transient response of the plant output while maintaining the stability of the overall system established by Narendra et al. (1997). Models with fixed parameters as well as time-varying ones are used during operation, and the main idea is to start a new fixed model whenever the switching from a time-varying model to a fixed model occurs. The new fixed model will be effectively used if the plant parameters take the original values at a later time. The effectiveness of the proposed method is demonstrated through simulation studies.