9.4 Conclusion
A method for performance monitoring and assessment of a single-loop control system, using the shape factor from relay feedback, is presented. It was shown that the shape of the relay output characterizes the performance of the controller. Improved controller settings can be back-calculated whenever the shape of the relay feedback deviates from its optimal form. The results show that the proposed scheme provides a reliable way to assess controller performance, and, if necessary, to readjust the controller parameters. More importantly, it employs only one relay test and provides a simple method, compatible even with a non-expert operator, to assess the controller performance as well as to find the correct controller parameters.
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9.5 References
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(2006). Control Performance Monitoring. In: Autotuning of PID Controllers. Springer, London. https://doi.org/10.1007/1-84628-037-0_9
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DOI: https://doi.org/10.1007/1-84628-037-0_9
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