A hybrid approach to failure diagnosis of industrial systems

This paper presents a hybrid approach to failure diagnosis that integrates the qualitative discrete event systems diagnostic methodology with quantitative analysis based techniques. The primary motivation for this hybrid approach is to achieve failure diagnosis in systems with limited sensor availability. The proposed scheme combines the relative advantages of the quantitative and the qualitative diagnostic schemes, and it allows integration of a variety of diagnostic technologies in one unified framework. The approach is illustrated using the paper feeder system of a digital copier as an example