Design of robust fault detection filter for hybrid switched systems

This paper addresses the problem of design a fault detection system for switched systems with unknown inputs. The residual generator based robust fault detection filter (RFDF) will be used, where the switching signal is assumed to be known, and the continuous states will be estimated, resulting a generation of residual signals for each linear model. Dwell-time constraint will be used to ensure the stability for the switched system. The RFDF design is formulated as optimization problem, and solved iteratively by linear matrix inequality (LMI). Stability is analyzed by using the switched Lyapunov functions. Finally a practical example from lateral vehicle dynamics is provided to illustrate the functionality of the proposed technique.