In discrete time estimation and control, it is traditionally assumed that measurements and/or control signals are transmitted periodically to the estimator/controller. However, it is often not necessary to have access to these signals at every time step in order to satisfy required performance objectives. By transmitting only when necessary, as dictated by performance objectives, e.g. such as when the performance of the system has deteriorated sufficiently, savings in energy usage can be achieved. This is particularly important in networked estimation and control applications, as the task of transmission is usually the main source of energy consumption for wireless sensors.
Our work in event triggered control has included the study of controllers with buffers for storing tentative future control inputs. In event triggered estimation, our work has focused on studying the structure of optimal triggering conditions.
With event triggering, the system needs to be continuously monitored for whether the triggering event for transmission has occurred. An alternative is to use a self-triggering mechanism, where after each transmission, the time for the next transmission is also computed. Recent work has studied self-triggered control with multiple control loops.
N. Cardoso de Castro, D. E. Quevedo, F. Garin and C. Canudas de Wit, "Energy-Aware Radio Chip Management for Wireless Networked Control Systems", IEEE Transactions on Control Systems Technology, provisionally accepted
S. Liu, L. Xie and D. E. Quevedo, "Event-Triggered Quantized Communication Based Distributed Convex Optimization from a Control Perspective", IEEE Transactions on Control of Network Systems, to appear
A. S. Leong, S. Dey and D. E. Quevedo, "Sensor Scheduling in Variance Based Event Triggered Estimation With Packet Drops'', IEEE Transactions of Automatic Control, provisionally accepted
E. Henriksson, D. E. Quevedo, E. G. W. Peters, H. Sandberg and K. H. Johansson, "Multiple Loop Self-Triggered Model Predictive Control for Network Scheduling and Control", IEEE Transactions on Control Systems Technology, vol. 23, no. 6, pp. 2167-2181, Nov. 2015
D. E. Quevedo, V. Gupta, W.-J. Ma and S. Yuksel, "Stochastic Stability of Event-Triggered Anytime Control", IEEE Transactions on Automatic Control, vol. 59, no. 12, pp. 3373-3379, Dec. 2014
B. Demirel, V. Gupta and M. Johansson, “On the Trade-Off Between Control Performance and Communication Cost for Event-Triggered Control over Lossy Networks”, Proc. ECC, pp. 1168-1174, Zurich, Switzerland, Jul. 2013