Fault-tolerant control

In addition to using sliding mode observers for fault detection and isolation, the well-known robustness properties of sliding mode control can be exploited to achieve fault-tolerant control with respect to actuator faults. These robustness properties make sliding mode schemes attractive for applications in the area of aircraft flight control. Recent work has considered sliding mode control in the context of 'control allocation'. In this situation the total control effort is distributed between a set of similar actuators (which constitutes redundancy within the system). The novelty of this work is that the control allocation scheme automatically redistributes the control signal, based on estimates of the effectiveness level of the actuators, which are obtained using sliding mode observers. These ideas have been applied and tested on the El-Al Flight 1862 crash scenario and implemented on the SIMONA flight simulator as part of GARTEUR FM-AG16.