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Modelling of Fault Detection and Diagnostics for Hybrid Bus Using Chain Graph Models
Author(s) -
Flaccadoro Diana,
Cervellera Cristiano,
Bosia Giorgio,
Riccomagno Eva
Publication year - 2014
Publication title -
quality and reliability engineering international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.913
H-Index - 62
eISSN - 1099-1638
pISSN - 0748-8017
DOI - 10.1002/qre.1691
Subject(s) - graphical model , markov chain , computer science , fault detection and isolation , probabilistic logic , conditional independence , graph , conditional dependence , statistical model , independence (probability theory) , reliability engineering , data mining , theoretical computer science , machine learning , engineering , artificial intelligence , mathematics , statistics , actuator
Graphical models are statistical models supported on a graph structure: nodes represent random variables, and missing edges represent probabilistic relationship of conditional independence. This makes them suited to model the behavior of complex systems that are difficult to model through mathematical equations. In this work, this possibility is exploited in a context of diagnostics and fault detection. Specifically, the fault detection problem is reduced to the evaluation of a conditional probability. The relevant conditional distribution is derived from the analysis of a suitable graphical model taking advantage of the so‐called Markov properties. As a case study, we consider diagnostics of a hybrid bus, characterized by the combined use of a diesel engine and an electrical engine. The aim of the study is to verify the correct operation of the electrical system, in particular the status of the battery. Copyright © 2014 John Wiley & Sons, Ltd.