Selecting and Utilizing Sequential Residual Generators in FDI Applied to Hybrid Vehicles
For a realistic model of a complex system there will be thousands of
possible residual generators to be used for diagnosis. Based on
engineering insights of the system to be monitored, certain algebraic
and dynamic properties of the residual generators may be preferred,
and therefore a method for finding sequential residual generators has
been developed that accounts for these properties of the residual
generator candidates. It is shown that only a small fraction of all
residual generator candidates fulfill fundamental requirements, and
thereby proves the value of systematic methods. Further, methods are
devised for utilization of the residual generators, such as
initialization of dynamic residual generators. A proposed method,
considering the fault excitation in the residuals using the internal
form of the residuals, significantly increases the diagnosis
performance. A hybrid electric vehicle is used in a simulation study
for demonstration, but the methods used are general in character and
provides a basis when designing diagnosis systems for other complex
systems.
Christofer Sundström, Erik Frisk and Lars Nielsen
IEEE Transactions on Systems, Man, and Cybernetics: Systems,
2014
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