This project, called Elodi project, aims at realize a framework to produce a maintenance tool (diagnosing and repairing) of a complex system using the design data. This study is applied to a large scale and complex system: the wayside equipment of the high speed signaling system TVM 430. Since 1993, this device is used to bring the on-board signalling of the TGV. The TVM system is presented in this paper, following by the description of the problem of the model-based diagnoses. The discussion is ended with modelling problem to obtain a tool for the maintenance task.
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