An iterative learning observer for fault detection and accommodation in nonlinear time-delay systems.

*(English)*Zbl 1127.93335Summary: This article addresses fault detection, estimation, and compensation problem in a class of disturbance driven time delay nonlinear systems. The proposed approach relies on an iterative learning observer (ILO) for fault detection, estimation, and compensation. When there are no faults in the system, the ILO supplies accurate disturbance estimation to the control system where the effect of disturbances on estimation error dynamics is attenuated. At the same time, the proposed ILO can detect sudden changes in the nonlinear system due to faults. As a result upon the detection of a fault, the same ILO is used to excite an adaptive control law in order to offset the effect of faults on the system. Further, the proposed ILO-based adaptive fault compensation strategy can handle multiple faults. The overall fault detection and compensation strategy proposed in the paper is finally demonstrated in simulation on an automotive engine example to illustrate the effectiveness of this approach.

##### MSC:

93C23 | Control/observation systems governed by functional-differential equations |

93E12 | Identification in stochastic control theory |

93B07 | Observability |

93E35 | Stochastic learning and adaptive control |

##### Keywords:

fault detection and isolation; observer based fault detection; iterative learning observer; nonlinear fault detection; time delay systems
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\textit{W. Chen} and \textit{M. Saif}, Int. J. Robust Nonlinear Control 16, No. 1, 1--19 (2006; Zbl 1127.93335)

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