Improving Multiple Fault Diagnosability using Possible Conflicts

Shared by Matthew Daigle, updated on Jan 07, 2014

Summary

Abstract

Multiple fault diagnosis is a difficult problem for dynamic systems. Due to fault masking, compensation, and relative time of fault occurrence, multiple faults can manifest in many different ways as observable fault signature sequences. This decreases diagnosability of multiple faults, and therefore leads to a loss in effectiveness of the fault isolation step. We develop a qualitative, event-based, multiple fault isolation framework, and derive several notions of multiple fault diagnosability. We show that using Possible Conflicts, a model decomposition technique that decouples faults from residuals, we can significantly improve the diagnosability of multiple faults compared to an approach using a single global model. We demonstrate these concepts and provide results using a multi-tank system as a case study.

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Publication Name
Proceedings of the 8th IFAC Symposium on Fault Detection, Supervision and Safety of Technical Processes
Publication Location
Mexico City, Mexico
Year Published
2012

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