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.
Original language | English |
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Title of host publication | Proceedings of the 2nd International Conference on Control and Fault Tolerant Systems |
Publisher | IEEE Press |
Publication date | 2013 |
ISBN (Print) | 978-1-4799-2855-2 |
DOIs | |
Publication status | Published - 2013 |
Event | 2nd International Conference on Control and Fault Tolerant Systems - Nice, France Duration: 9 Oct 2013 → 11 Oct 2013 Conference number: 2 |
Conference
Conference | 2nd International Conference on Control and Fault Tolerant Systems |
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Number | 2 |
Country/Territory | France |
City | Nice |
Period | 09/10/2013 → 11/10/2013 |