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Event- and Self-Triggered Control

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Contents

Extended Abstract

Event-triggered and self-triggered control have recently been proposed as implementation strategies that considerably reduce the resources required for control. The underlying idea behind these paradigms is to reduce the usage of the communication bandwidth by transmitting data only when needed to ensure the desired stability properties. Most of the existing techniques focus on the case of a single loop where all sensors are collocated. Such an assumption does not hold in many cases. Our recent work [1] (jointly developed with Romain Postoyan, Dragan Nešić and Paulo Tabuada) considers instead control systems where physically distributed sensors, controllers and actuators communicate via a shared wired channel. For this matter, we first develop a new prescriptive framework based on hybrid Lyapunov functions[2]. This framework is then used to develop event-triggered and self-triggered strategies for distributed control loops. Moreover, this approach allows us to recover and improve previous existing techniques for the case of collocated control loops. This work represents the first step towards a more fundamental question in distributed networked control: given a set of physically distributed sensors and actuators, how should communication between the different nodes be scheduled?

At the same time, different event-triggered and self-triggered schemes are being implemented on a wireless network control system (in collaboration with Jose Araujo and Karl Henrik Johansson) [3] [4]. The control of a water tank system is used as a benchmark to compare these new resource-aware implementation paradigms in terms of energy savings and bandwidth utilization.

People involved

Cooperation


Publications

  1. R. Postoyan, P. Tabuada, D. Nešić, A. Anta. Event-triggered and self-triggered stabilization of networked control systems. In IEEE Conference on Decision and Control and European Control Conference, Orlando, 2011.
  2. R. Postoyan, A. Anta, D. Nešić, P. Tabuada. A unifying Lyapunov-based framework for the event-triggered control of nonlinear systems. In IEEE Conference on Decision and Control and European Control Conference, Orlando, 2011.
  3. J. Araujo, A. Anta, M. Mazo, J. Faria, A. Hernandez, P. Tabuada, K.H. Johansson. Self-triggered control over wireless sensor and actuator networks.. In Distributed Computing in Sensor Systems and Workshops (DCOSS), 2011 International Conference on, pages 1 -9, june 2011.
  4. J. Araujo, A. Anta, M. Mazo, J. Faria, A. Hernandez, P. Tabuada, K.H. Johansson. Self-Triggered Control for Industrial Wireless Sensor and Actuator Networks (White Paper).. In Information Processing in Sensor Networks Workshop CFP: Real-Time Wireless for Industrial Applications, 2011.

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