Event-triggered Output Feedback Control Research Articles

Event-Triggered Output Feedback Stabilization via Dynamic High-Gain Scaling

This paper addresses output feedback stabilization via event-triggered output feedback. In the first part of the paper, linear systems are considered, whereas the second part shows that a dynamic event-triggered output feedback control law can achieve feedback stabilization of the origin for a class of nonlinear systems by employing dynamic high-gain techniques.

Event-triggered output feedback control for distributed networked systems

This paper addresses the problem of output-feedback communication and control with event-triggered framework in the context of distributed networked control systems. The design problem of the event-triggered output-feedback control is proposed as a linear matrix inequality (LMI) feasibility problem. The scheme is developed for the distributed system where only partial states are available. In this scheme, a subsystem uses local observers and share its information to its neighbors only when the subsystem׳s local error exceeds a specified threshold. The developed method is illustrated by using a coupled cart example from the literature.

Event-based control of nonlinear systems with partial state and output feedback

This paper studies the event-triggered control problem for nonlinear systems with partial state and output feedback. We first consider the control systems that are transformable into an interconnection of two input-to-state stable (ISS) subsystems with the sampling error as the external input. It is shown that infinitely fast sampling can be avoided and asymptotic stabilization can be achieved by appropriately choosing the decreasing rate of the threshold signal of the event-trigger. Then, we focus on the event-triggered output-feedback control problem for nonlinear uncertain systems in the output-feedback form. The key idea is to introduce a novel nonlinear observer-based control design and to transform the control system into the form of interconnected ISS systems. ISS small-gain methods are used as a fundamental tool in the discussions.

Event-Triggered Output Feedback Control Resilient Against Jamming Attacks and Random Packet Losses

A networked output feedback control problem for linear discrete-time dynamical systems is explored. The communication channel used for transmission of output information packets from the plant to the controller is assumed to be subject to malicious jamming attacks and random packet losses due to unreliability of the network. We propose an event-triggered observer-based control strategy that guarantees almost sure asymptotic stabilization. We provide a numerical method for finding observer gains as well as parameters for our proposed event-triggering mechanism and illustrate the efficacy of our approach through a numerical example.

Weakly coupled event triggered output feedback system in wireless networked control systems

This paper examines output feedback control of wireless networked control systems where there are separate links between the sensor-to-controller and controller-to-actuator. The proposed triggering events only rely on local information so that the transmissions from the sensor and controller subsystems are not necessarily synchronized. This represents an advance over recent work in event-triggered output feedback control where transmission from the controller subsystem was tightly coupled to the receipt of event-triggered sensor data. The paper presents an upper bound on the optimal cost attained by the closed-loop system. Simulation results demonstrate that transmissions between sensors and controller subsystems are not tightly synchronized. These results are also consistent with derived upper bounds on overall system cost.

Event-triggered output feedback control for networked control systems using passivity: Achieving [formula omitted] stability in the presence of communication delays and signal quantization

When network induced delays are considered in the event-triggered control literature, they are typically delays from the plant to the network controller and a tight bound on the admissible delays is usually imposed based on the analysis of inter-event time to guarantee stability of the event-triggered control systems. In this paper, we introduce a framework for output feedback based event-triggered networked control systems (NCSs). The triggering condition is derived based on passivity theory which allows us to characterize a large class of output feedback stabilizing controllers. The proposed set-up enables us to consider network induced delays both from the plant to the network controller and from the network controller to the plant. We also take quantization of the transmitted signals in the communication network into consideration and we show that finite-gain L2 stability can be achieved in the presence of time-varying (or constant) network induced delays with bounded jitters, without requiring that the network induced delays be upper bounded by the inter-event time.