DefinePK

Abstract

When a fault occurs in a system, after the fault detection and isolation (FDI), the system applies fault-tolerant control, reconfiguration and control restructuring in the best way possible to achieve stability. The Fault-Tolerant Control (FTC) fixes the system's control problems by creating the capabilities of self-repair and fault resilience. In fault-tolerant control literature, the major interests are centered in safety-critical systems. In this paper, the fault considered, is actuator failure which is one of the most severe conditions of failure for a system. The constraint in applying the actuator control signal as a physical constraint has overshadowed the problem. The purpose is to design a reconfiguration block for systems to recover control purposes against negative impacts resulting from the failure, which makes doing this possible without requiring to identification the parameters of faulty system and create changes in the nominal controller. The approach is to distribute the role of the faulty actuator among other working system actuators by adding a virtual actuator between the faulty system and the nominal control as the reconfiguration block, so that it hides the fault from the nominal controller and establishes stability in applying the actuator control signal, in the presence of the constraint.