Managing quality-of-control in network-based control systems by controller and message scheduling co-design
Marti, P.
Yepez, J.
Velasco, M.
Villa, R.
Fuertes, J.M.
Dept. of Autom. Control & Comput. Eng., Tech. Univ. of Catalonia, Barcelona, Spain;
This paper appears in: Industrial Electronics, IEEE Transactions on
Publication Date: Dec. 2004
Volume: 51,
Issue: 6
On page(s): 1159- 1167
ISSN: 0278-0046
INSPEC Accession Number: 8201261
Digital Object Identifier: 10.1109/TIE.2004.837873
Current Version Published: 2004-11-22
Abstract
In network-based control systems (NCSs), plant sensor-controller-actuator nodes in closed-loop operation drive principal network traffic. The quality-of-control (QoC) in an NCS, i.e., the performance delivered by each closed-loop operation, depends not only on the controller design but also on the message scheduling strategy. In this paper, we show that the co-design of adaptive controllers and feedback scheduling policies allows for the optimization of the overall QoC. First, we discuss the limitations of standard discrete-time control models for controllers of control loops that are closed over communication networks. Afterwards, we describe an approach to adaptive controllers for NCS that: 1) overcomes some of the previous restrictions by online adapting the control decisions according to the dynamics of both the application and executing platform and 2) offers capabilities for dynamic management of QoC through message scheduling.
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