Abstract
The Fault Detection and Isolation (FDI) using the Unknown Input Observer (UIO) for a supermarket refrigeration system is investigated. The original system's state $T_{goods}$ (temp. of the goods) is regarded as a system unknown input in this study, so that the FDI decision is not disturbed by the system uncertainties relevant to this state dynamic and the original system disturbance $Q_{airload}$ (the thermal feature of the air). It has been observed that a single UIO has a very good detection capability for concerned sensor and parametric faults. However, only the parametric fault can be isolated by using a bank of UIOs. Thereby, a complete FDI approach is proposed by combining the Extended-Kalman-Filter (EKF) and UIO methods, after an extensive comparison of KF-, EKF- and UIO-based FDI methods is carried out. The simulation tests show that the complete FDI approach has a good and successful FDI capability regarding to concerned fault scenarios.
Originalsprog | Engelsk |
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Bogserie | Proceedings of the 18th IFAC World Congress, 2011 |
Sider (fra-til) | 4238-4243 |
Antal sider | 6 |
ISSN | 1474-6670 |
Status | Udgivet - aug. 2011 |
Begivenhed | The 18th World Congress of the International Federation of Automatic Control (IFAC 2011) - Milano, Italien Varighed: 28 aug. 2011 → 2 sep. 2011 |
Konference
Konference | The 18th World Congress of the International Federation of Automatic Control (IFAC 2011) |
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Land/Område | Italien |
By | Milano |
Periode | 28/08/2011 → 02/09/2011 |