Two-level design for aperiodic networked control systems

• Published in: Signal processing Vol. 120; pp. 43 - 55
• Main Authors: Memon, Azhar M., Mahmoud, Magdi S.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 01.03.2016
• Subjects: [formula omitted] controller; Modified IEEE 802.15.4 protocol; Networked control; Priority-based scheduling (PBS); Self-triggering; Two-level design; H∞ controller; Self-triggering; Priority-based scheduling (PBS); Networked control; Modified IEEE 802.15.4 protocol; Two-level design
• ISSN: 0165-1684; 1872-7557
• DOI: 10.1016/j.sigpro.2015.08.015

Two critical issues in networked control systems are coupling of control and communication, and energy economy, especially for battery powered wireless sensor nodes. In this regard, a two-level design procedure for multiple loops with H∞ based self-triggered control applied over the modified IEEE 802.15.4 wireless protocol is presented. Control and communication are decoupled by introducing an upper-bound on the transmission rate, and optimal usage of communication bandwidth and energy is guaranteed by modifying the wireless protocol. The presented priority-based scheduling algorithm can accommodate more systems as compared with the number of available transmission slots, while being efficient in terms of computational load and energy consumption. Simulation results show a significant reduction in energy expenditure in terms of decrease in duty cycle as compared with the periodic implementation. •Self-triggered H∞ controller with modified IEEE 802.15.4 protocol is presented.•Predicted nature of triggering time is used to improve energy efficiency of the protocol.•Collisions and congestion are avoided in the network due to self-triggering.•Modified protocol can accommodate more systems than maximum allowed transmission slots.•Results indicate improvement in energy economy as compared with the periodic setting.