Event-Triggered Diagnostic Observer Design Using the Performance Tradeoff Approach

Jingsong Wu,Mingfang Wu,Aibing Qiu,Shengfeng Wang

doi:10.1109/access.2022.3150845

Abstract

This paper presents an optimal diagnostic observer design scheme to deal with the remote fault detection problem for a local closed-loop system with unknown external disturbances and faults. To utilize limited network shared resources efficiently, an event-triggered generator is employed in the local closed-loop system to determine whether to transmit the current output measurement for fault detection. By constructing the error system that contains event-triggered transmission errors and evaluating the composition of the residual under the constraint of Luenberger conditions, the diagnostic observer which has optional order and flexible structure is designed by the use of factorization techniques to achieve the optimal performance tradeoff between disturbance robustness and fault sensitivity. Next, the inevitable influence of reference input on the residual is taken into account in the residual evaluation to deliver a time-varying threshold. Finally, a vehicle lateral dynamic system is presented to illustrate the validity of the proposed optimal diagnostic observer design scheme.

Highlights

As modern engineering systems become larger and more complex, remote monitoring and control have become the norm with the assistance of network communication technology
MAIN RESULTS the main results are presented including the analysis of diagnostic observer dynamic model, the design of optimal diagnostic observer, and residual evaluation
In this paper, we have investigated an event-triggered optimal diagnostic observer for fault detection

Summary

INTRODUCTION

As modern engineering systems become larger and more complex, remote monitoring and control have become the norm with the assistance of network communication technology. In consideration of the advantages of diagnostic observer, it is desirable to develop a performance tradeoff based diagnostic observer for event-triggered systems for fault detection. A tradeoff approach based event-triggered optimal diagnostic observer is developed for event-triggered systems for fault detection. 1) By evaluating the influences of unknown external disturbances, faults, and event-triggered transmission errors on the residual, the design of diagnostic observer, where a general event-triggered mechanism is used to reduce the communication load, is formulated as an H∞/H∞ optimization problem to make a tradeoff between fault sensitivity and disturbance robustness.

SYSTEM DESCRIPTION

THE ANALYSIS OF DIAGNOSTIC OBSERVER DYNAMIC MODEL

THE DESIGN OF OPTIMAL DIAGNOSTIC OBSERVER

SIMULATION RESULTS

DO-Residual evaluation DO-Threshold

CONCLUSION