Communication Schemes for Centralized and Decentralized Event-Triggered Control Systems

Sokratis Kartakis, Anqi Fu, Manuel Mazo, Julie A. McCann
2017 IEEE Transactions on Control Systems Technology  
Energy constraint long-range wireless sensor/ actuator based solutions are theoretically the perfect choice to support the next generation of city-scale cyber-physical systems. Traditional systems adopt periodic control which increases network congestion and actuations while burdens the energy consumption. Recent control theory studies overcome these problems by introducing aperiodic strategies, such as event-triggered control. In spite of the potential savings, these strategies assume actuator
more » ... continuous listening while ignoring the sensing energy costs. In this paper, we fill this gap, by enabling sensing and actuator listening duty-cycling and proposing two innovative MAC protocols for three decentralized event-triggered control approaches. A laboratory experimental testbed, which emulates a smart water network, was modelled and extended to evaluate the impact of system parameters and the performance of each approach. Experimental results reveal the predominance of the decentralized event-triggered control against the classic periodic control either in terms of communication or actuation by promising significant system lifetime extension. where q(s) denotes a quantized signal of s, J is an index set: J ⊆ {1, · · · , n} for ξ(t), indicating the occurrence of events, J c := {1, · · · , n} \ J . Define Γ J := diag(γ 1 J · · · , γ n J ). The element γ l J , with l ∈ {1, · · · , n} is equal to 1, if l ∈ J , and 0 otherwise. Furthermore, we use the notation Γ j = Γ {j} . The local eventtriggering condition is:
doi:10.1109/tcst.2017.2753166 fatcat:pf3qfkvzczcwzhyhbzle6yy2z4