Qiu Aibing

Event-triggered sampling and fault-tolerant control co-design based on fault diagnosis observer

A co-design scheme of event-triggered sampling mechanism and active fault tolerant control (FTC) is developed. Firstly, a fault diagnosis observer is designed to estimate both the fault and the state simultaneously by using the event-triggered sampled output. Some H ∞ constraints between the estimation errors and the event-triggered sampling mechanism are established to ensure the estimation accuracy. Then, based on the constraints and the obtained fault information, an event-triggered detector and a static fault tolerant controller are co-designed to guarantee the stability of the faulty system and to reduce the sensor communication cost. Furthermore, the problem of the event detector and dynamic FTC co-design is also investigated. Simulation results of an unstable batch reactor are finally provided to illustrate the effectiveness of the proposed method.

Fault tolerant control for a class of nonuniformly sampled-data systems

This paper preliminarily investigates the problem of fault tolerant control for nonuniformly sampled-data systems. Firstly, based on the analysis that the adaptive fault diagnosis observer is not appropriate for sampled-data systems, a novel augmented fault estimation observer is developed to simultaneously estimate continuous-time state and fault by use of discrete-time nonuniformly sampled output. Using the on-line fault and state information, a sampled-data state feedback fault tolerant controller which is nonuniformly updated is designed to guarantee the stability of closed-loop system in presence of faults. Finally simulation results are presented to illustrate the efficiency of the proposed method.