Sliding mode observers for reconstruction of simultaneous actuator and sensor faults

This paper presents a method for reconstructing simultaneous actuator and sensor faults using sliding mode observers, building on previous work, which considered the two cases separately. Appropriate filtering of the system´s output yields a ´fictitious system´ whose ´actuator faults´ are the original actuator and sensor faults. Applying an actuator fault methodology from previous work to the fictitious system, accurate reconstructions of the actuator and sensor faults can be obtained.