A sensor FDI strategy for safety critical systems

The research work is focused on sensors fault isolation, exploiting the synergy of functional and physical redundancy. Functional and physical redundancy is applied under a novel methodological approach to isolate individual sensor faults. The contribution uses a heuristic algorithm which combines a rule based strategy associated to a process parameter identification method to be applied on the instrumentation fault detection and isolation task. Implementation procedure is carried out on a pilot plant equipped with supervision facilities from DeltaV, state of the art software, which efficiently manage databases, rule based systems and appropriate identification support tools.