A Tradeoff Approach for Optimal Fault Detection of Networked Control Systems With Event-Triggered Scheme

Zhen Zhao,Chunping Wang,Jinfeng Gao

doi:10.1109/access.2019.2935534

Zhen Zhao, Chunping Wang + Show 1 more

Open Access

https://doi.org/10.1109/access.2019.2935534

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Abstract

An optimal fault detection (FD) approach for a class of networked control systems (NCSs) is concerned in this work. To improve the accuracy of the FD, a new event-triggered scheme (ETS) is addressed, where the output measurement transmitted or not is determined by a set of conditions instead of a single condition. Moreover, output measurements in these conditions are not only the last transmitted data, but also the data in the past period of time. The structure of fault detection and isolation (FDI) consisting of the residual generation and residual evaluation can detect faults as accurately as possible, and show robustness to disturbances in the meantime. Optimal observer gains can be obtained by utilizing the discrete-time Riccati equation (DTRE), and the time-varying threshold can be specified by employing the linear matrix inequality (LMI). Finally, a numerical simulation and the application on closed-loop continuous stirred-tank reactor (CSTR) are adopted to prove the superiority of the proposed approach.

Highlights

Networked control systems (NCSs), which transmit and exchange data over the communication network, have received much attention in recent decades
Motivated by the above discussion, in this work, we address the tradeoff approach of optimal fault detection (FD) with event-triggered scheme (ETS), triggers are determined by a set of conditions instead of a single condition, and the values in these conditions are the last transmitted data, and the data in the past period of time
Remark 2: According to Theorem 2, in order to ensure the feasibility of linear matrix inequality (LMI), an appropriate range of threshold Jth should be set by considering the actual production needs, and triggering parameter σ can be adjusted within the range to achieve the best tradeoff between the communication cost and FD performance

Summary

Introduction

Networked control systems (NCSs), which transmit and exchange data over the communication network, have received much attention in recent decades. INDEX TERMS Networked control systems, event-triggered scheme, optimal fault detection, tradeoff, residual generation.

Results

Conclusion