Abstract
Feedback control systems are vulnerable to faults in control loop sensors and actuators, because feedback action may cause abrupt and damaging responses when faults occur. Despite the importance of the subject, research results from analysis, design, and implementation of fault handling methods have not been widely accepted in the industry. One reason has been scarcity of realistic examples for testing of new methods against industrial systems. Another has been lack of interaction between control systems theory and computer science in this area. This paper is a contribution to help bridging these gaps.
Mathematical methods to detect and isolate faults in industrial feedback control systems are presented and analyzed, and it is shown where these methods work well and where other techniques are needed. An industrial position control loop with electro-mechanical components is used as an application example because it has several characteristics which are generic for hybrid feedback control systems. As a salient feature, the paper provides both a simple mathematical model of this system for use in the design of fault handling methods and a complete, nonlinear description for simulation and verification work. These models make it possible to make bench-mark testing of new methods including assessment of robustness against modelling uncertainty and process disturbances. These are crucial for industrial applicability but somewhat overlooked in hybrid system theory.
Key contributions are the presentation and analysis of an industrial feedback system which is suitable for bench-mark testing of new ideas in hybrid system theory, and the demonstration of state of the art in mathematical methods for fault detection and accommodation.
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Blanke, M., Nielsen, S.B., Jørgensen, R.B. (1993). Fault accommodation in feedback control systems. In: Grossman, R.L., Nerode, A., Ravn, A.P., Rischel, H. (eds) Hybrid Systems. HS HS 1992 1991. Lecture Notes in Computer Science, vol 736. Springer, Berlin, Heidelberg. https://doi.org/10.1007/3-540-57318-6_38
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DOI: https://doi.org/10.1007/3-540-57318-6_38
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