Fault diagnosis via a polynomial observer

The fault diagnosis problem of a class of nonlinear systems based on a differential approach is used to determine fault diagnosability with the minimum number of measurements from the system. In order to reconstruct the faults on the system, a polynomial observer is proposed, which includes in its structure corrections terms of high order. Another two schemes of nonlinear observers are used for reconstructing the faults for comparison purposes, one of them being a reduced order observer and the other a sliding mode observer. The approach was tested in a real-time experimental setting Amira DTS-200.