Predictor-Based Periodic Event-Triggered Control for Dual-Rate Networked Control Systems With Disturbances

Abstract

This paper considers the problem of periodic eventtriggered control design for dual-rate networked control system subject to non-vanishing disturbance. The plant considered in this paper is a kind of dual-rate networked control system, where sensor samples the measurement output at a slow-rate and actuator updates the control input at a fast-rate. Despite the slow-rate sampling of sensor, a new output predictor-based observer is proposed to accurately estimate system state and disturbance in the inter-sample time interval, and an active antidisturbance controller that updates at a fast-rate is accordingly proposed, such that the desirable control performance and disturbance rejection performance can be achieved. At each fastrate updating time instant, we use the prediction technique to generate a data packet including the computed current control input and the predicted values of the control inputs for the future finite steps, and design a new periodic event-triggered mechanism to determine whether to transmit the data packet via communication network or not. The proposed control method is easily implemented in digital platform since it has a discretetime form. To verify the effectiveness of the proposed control method, we finally present the simulation results of a practical speed control system.

Periodic Event-Triggered Control for a Class of Nonminimum-Phase Nonlinear Systems Using Dynamic Triggering Mechanism

“…where K = [K x , −1]. In (9), the sampling of the continuous variables causes the error signal −L p K x ( ω(t) − ω(kT )) + ẑ1 (t) − ẑ1 (kT ) and the event-triggering mechanism leads to the error signal L p Kρ(t).…”

“…R ECENTLY, networked control system (NCS) has been attracting lots of attention with the extensive applications of digital processors and network technique into control systems [1]- [6]. One of the main issues emerging in NCS is the conflict between the increasing amount of data to be transmitted and the limited communication bandwidth [7]- [9]. In the conventional sampled-data control (namely, timetriggered control) [10], [11], the control tasks are executed with a fixed sampling period.…”

Predictor-Based Extended State Observer for Disturbance Rejection Control of Multirate Systems With Measurement Delay

“…However, this paper considers multi-rate disturbance rejection control for control systems where the sampling period and updating period are different. (3) Existing works [18]- [21] assumed that the sensor's sampling period needs to be a multiple of the actuator's updating period. Different from [18]- [21], this paper relaxes the condition on the relationship between sensor period and actuator period, and proposes a new multi-rate rejection control method using predictor-based extended state observer.…”

A New Alternating Predictive Observer Approach for Higher Bandwidth Control of Dual-Rate Dynamic Systems

“…For discrete-time dual-rate dynamic systems, the state interpolations can be obtained by using model iteration based on the measured states at the sampling instant [11]- [13]. While for continuous-time dualrate dynamic systems, the pre-integration approach is usually exploited to generate continuous state information over the digital sampling interval such that the missing states over the sampling interval are recovered and can be utilized for controller design [14]- [16]. These state interpolation approaches work well in the case of full state measurements [17], [18].…”