Recursive identification algorithms for continuous-time nonlinear plants operating in closed loop

A family of algorithms For the identification of continuous-time nonlinear plants operating in closed loop is presented. An adjustable closed-loop out put error-type predictor parameterized in terms of the existing controller and the estimated plant model is used. The algorithms are derived from stab ility considerations in the absence of noise and assuming that the plant mo del is in the model set. Some convergence results based on passivity concep ts are presented. Subsequently, the algorithms are analyzed in the presence of noise and when the plant model is not in the model set. (C) 2001 Elsevi er Science Ltd. All rights reserved.