The Fault Detection and Isolation (FDI) method proposed in this contribution is based on the use of the bond graph tool. This method is particularly suitable for multi-physical systems, where several types of energy are involved. The use of bond graph allows easily deriving analytical models, eliminating the unknown variables and generating Analytical Redundancy Relations (ARRs). The elimination process is based on the exploitation of the causal and the structural properties of bond graph. The numerical evaluation of the ARRs leads to residuals, which are then used to detect and isolate the faults on the system.
