Stable adaptive control of feedback linearizable time-varying non-linear systems with application to fault-tolerant engine control

Stable indirect and direct adaptive controllers are presented for a class of input–output feedback linearizable time-varying non-linear systems. The radial basis function neural networks are used as on-line approximators to learn the time-varying characteristics of system parameters. Stability results are given in the paper, and the performance of the indirect and direct adaptive schemes is demonstrated through a fault-tolerant engine control problem where the faults are naturally time-varying.