Fault diagnosis and accommodation design for nonlinear systems described by interpolated LTI models

The main goal of this paper consists in the development of a new actuator fault-tolerant control dedicated to nonlinear systems. Based on the assumption that the nonlinear system is described by a finite number of interpolated linear time invariant models, the proposed method makes possible the faults compensation for the whole operating range through an extended interacting multiple model. Its principle is based on the simultaneous on-line detection, isolation, estimation of actuator faults and an effective operating regime. Multiple banks of decoupled Kalman filters is used to build an actuator fault-tolerant control in order to compensate the fault effect on the system, which is controlled by a multiple model switching and tuning scheme. The performances of the method are tested in simulation on a nonlinear benchmark.