ADVANCED CONTROL SYSTEMS

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ADVANCED CONTROL SYSTEMS

Introduction

Research on fault tolerant control (FTC) has been increasing in the last few years because FTC system has the ability to increase complex systems reliability and performance requirement in the events of faults. The design of a FTC system requires knowledge of advanced control mechanism. Systems mostly are very complicated. Designing a FTC system could also be very challenging. Different types of faults such as actuators, sensors, and system faults can occur. Each type of fault requires different approach to work with.
A fault tolerant control system must be able to perform: fault detection, fault isolation, and fault diagnosis. FTC should also have the ability to detect faults and provide correction. Fault tolerant control system results on two approaches: active and passive. The active approach relies on fault detection and isolation (FDI) scheme to detect the occurrence of faults in the system and to identify the source and severity of the faults [1]. Secondly, in passive FTC, potential component faults are known a priori and are all taken into consideration in the control system design stage[2].
The control law of the passive FTC is designed offline; it can be used instantly to perform fault detection, diagnosis and isolation. However, the passive approach cannot be used as the basic controller; it cannot guarantee the optimal performance of the nominal system. Furthermore, the controller might not fit the system with online faults. .The control law of the active FTC system is designed to operate when the system is running. This approach deals better with online faults. The challenging parts of an active FTC is designing a system that is robust enough to maintain system stability when the system is in reconfiguration mode. The FDD unit should be also robust to minimize error detections.
Fault tolerant control has been used largely to ensure aircraft safety, automobiles, and several computing systems. Therefore it plays a very important role in the areas of process control, communications, transportations, and e-commerce, and space. The design of Aircraft requires systems that are extremely reliable. For that reason, Fault tolerant control is mandatory to the safety of passengers. So many things can go wrong while operating an aircraft or a vehicle.
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ADVANCED CONTROL SYSTEMS 1
ADVANCED CONTROL SYSTEMS 2
ADVANCED CONTROL SYSTEMS 3