Key words: Variable Speed Hydrodynamics; Bond Graph; Modeling; Fault Detection and Isolation; Simulation

Abstract: Hydrodynamic couplers are often assigned to a group of their own research in the classification of couplings. This is justified by the particular operating principle of hydrodynamic power transmission. The transformation between the form of mechanical energy and hydropower offers various possibilities to vary the transmission power according to precise laws. The main idea to understand and study the dynamics of real systems is the modeling. The models are simplified and abstract constructs used to predict the real behavior. We proposed to use not the bond graph approach like the single tool responsible for modeling, as that is classically proposed in the literature, but like a mechanism complementary to enrichment. With this work, we helped to develop a platform for modeling of a hydrodynamic variable speed transmission able to model its bodies and to simulate and analyze its total behavior thereafter. This paper describes the application of our qualitative fault detection and isolation FDI approach to a hydrodynamics variable speed. We developa pseudo bond graph model of the system and demonstrate the FDI effectiveness. We introduce the problem analysis involved in the faults localization in this process. A number of new and interesting issues have been dealt with in this paper.