SENSOR FDI FOR A CLASS OF NONLINEAR SYSTEMS BASED ON A SLIDING MODE OBSERVER

摘要

In this paper, a sensor fault detection and isolation scheme is considered for a class of open-loop stable nonlinear systems. A simple filter is introduced to 'transform' the sensor fault into a pseudo-actuator fault scenario. Under some mild conditions, a sliding mode observer is designed to reconstruct the sensor fault precisely if the system does not experience any uncertainty, and to estimate the sensor fault when uncertainty exists. LMI techniques are used to synthesize the design parameters. A mass-spring system is employed to illustrate the effectiveness of the theoretical results.