Abstract
In this paper, a fault tolerant control (FTC) strategy is proposed for evaporator superheat control in supermarket refrigeration systems. Conventional control uses a pressure and temperature sensor for this purpose, however, the pressure sensor can fail to function. A contingency control strategy, based on a maximum slope-seeking control method and only a single temperature sensor, is developed to drive the evaporator outlet temperature to a level that gives a suitable superheat of the refrigerant. The FTC strategy requires no a priori system knowledge or additional hardware and functions in a plug & play fashion. The strategy is outlined by means of procedural steps as well as a flow chart that also illustrates the process of automatic tuning of the maximum slope-seeking controller. Test results are furthermore presented for a display case in a full scale CO2 supermarket refrigeration system.
Originalsprog | Engelsk |
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Titel | Proceedings of the 2nd International Conference on Control and Fault Tolerant Systems |
Forlag | IEEE Press |
Publikationsdato | 2013 |
ISBN (Trykt) | 978-1-4799-2855-2 |
DOI | |
Status | Udgivet - 2013 |
Begivenhed | 2nd International Conference on Control and Fault Tolerant Systems - Nice, Frankrig Varighed: 9 okt. 2013 → 11 okt. 2013 Konferencens nummer: 2 |
Konference
Konference | 2nd International Conference on Control and Fault Tolerant Systems |
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Nummer | 2 |
Land/Område | Frankrig |
By | Nice |
Periode | 09/10/2013 → 11/10/2013 |