Summary
Fault tolerant control offers enhanced availability and reduced risk of safety hazards when component failure and other unexpected events occur in a controlled plant. Fault-tolerant control merges several disciplines into a framework with common goals. The fault-tolerant properties are obtained through on-line fault detection and isolation, automatic condition assessment and calculation of appropriate remedial actions. The final step is activation of the necessary actions through software. The actions to accommodate a fault cover a wide range of possibilities and underlying theory. Appropriate re-tuning can sometimes suffice, estimation of a signal replacing a measurement from a faulty sensor is needed in other events, and some cases require complex re-configuration or on-line redesign. The basis for a remedial action is always detection of an undesired event and the correct assessment of the situation through isolation of the fault. Analysis of the effects of the not-normal conditions, and the possible remedial actions, is a truly complex problem in most cases. The paper gives an overview of recent progress in theory and methods to analyze and develop fault-tolerant control systems. Fault propagation analysis and severity assessment are shown to be the basic means to evaluate safety and dependability. Following this, an analysis of structure will disclose available redundancy and possibilities to recover from faults in the system. These overall tools lead to requirements to fault detection and isolation. Fault detection theory has been the subject of intensive study for two decades. Nevertheless, the requirements from the use in fault-tolerant architectures have caused new challenges and further development. This paper focus on recent results in overall design methods for fault-tolerant control systems. An example shows how the different concepts are used and illustrates the benefits from active fault tolerance as compared to a traditionally designed control architecture.
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Blanke, M. (1999). Fault-tolerant Control Systems. In: Frank, P.M. (eds) Advances in Control. Springer, London. https://doi.org/10.1007/978-1-4471-0853-5_6
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DOI: https://doi.org/10.1007/978-1-4471-0853-5_6
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