Using deadbands to reduce communication in networked control systems

Otanez, P.G.; Moyne, James; Tilbury, Dawn M.

doi:10.1109/acc.2002.1025251

Cited by 262 publications

(203 citation statements)

References 6 publications

Supporting

Mentioning

200

Contrasting

Unclassified

Order By: Relevance

“…Event-based systems have been proposed as a means to reduce congestion in Networked Control Systems (NCS) [1], [2]. Multiple closed-loop systems that share a communication channel between their respective sensors and controllers, as shown in Fig.…”

Section: Introductionmentioning

confidence: 99%

Stability analysis of multiple state-based schedulers with CSMA

Ramesh

Johansson

2012

2012 IEEE 51st IEEE Conference on Decision and Control (CDC)

View full text Add to dashboard Cite

Abstract-In this paper, we identify sufficient conditions for Lyapunov Mean Square Stability (LMSS) of a contention-based network of first-order systems, with state-based schedulers. The stability analysis helps us to choose policies for adapting the scheduler threshold to the delay from the network and scheduler. We show that three scheduling laws can result in LMSS: constant-probability laws and additively increasing or decreasing probability laws. Our results counter the notions that increasing probability scheduling laws alone can guarantee stability of the closed-loop system, or that decreasing probability scheduling laws are required to mitigate congestion in the network.

show abstract

Section: Introductionmentioning

confidence: 99%

Stability analysis of multiple state-based schedulers with CSMA

Ramesh

Johansson

2012

2012 IEEE 51st IEEE Conference on Decision and Control (CDC)

View full text Add to dashboard Cite

show abstract

“…Inspired by the deadband triggering-rule based on the output signal Otanez et al [2002], our intuition is to consider the deadband triggering rule on an appropriate filtered version of the output signal. For instance, by considering the control input as a filtered version of the output, our idea is to consider a deadband sampling on a input-like signal.…”

Section: Pi-based Triggering Rulementioning

confidence: 99%

On event-based PI control of first-order processes

Tiberi

Araújo

Johansson

2012

IFAC Proceedings Volumes

View full text Add to dashboard Cite

Abstract:In this paper the design of an event-based proportional-integral (PI) control scheme for stable first-order processes is considered. A novel triggering mechanism which decides the transmission instants based on an estimate of the PI control signal is proposed. This mechanism addresses some sideeffects that have been discovered in previous event-triggered PI proposals, which trigger on the process output. In the proposed scheme, the classic PI controller is further replaced with PIDPLUS, a promising version of PI controller for networked control systems. Although PIDPLUS has been introduced to deal with packet losses and time delays, and, to the best of our knowledge, a stability analysis of the closedloop system where such a controller is used has never been performed, here the performance of such a controller in an event-based fashion are analyzed, and a stability analysis is further provided. The proposed event-based scheme ensures set-point tracking and disturbance rejection as in classic timeperiodic implementations of PI controller, while greatly reducing the number of sensor transmissions. The theoretical results are validated by simulations, where the benefits in using PIDPLUS in combination with the proposed PI event-based triggering rule are shown.

show abstract

“…The deadband approach presented in [12] is used to distinguished situation 2 and 3. Each controlled plant has a state, which asymptotically tracks the reference r, which is supervised by the supervision task.…”

Section: Plant State Detectionmentioning

confidence: 99%