Fault detection and isolation in a mobile robot test-bed

Recently, a Bond-graph based Fault Detection and Isolation (FDI) framework has been developed with a new concept of Global Analytical Redundancy Relations (GARRs). This new concept allows the fault diagnosis for hybrid systems which consist of both continuous dynamics and discrete modes. In this paper the newly developed method is studied in details using an electro-hydraulic steering system of a CyCab mobile robot. GARRs are derived systematically from a Hybrid Bond Graph (HBG) model with a specific causality assignment. FDI is applied, experimental setup is described, and results are discussed.