Adapting the sampling period of a real-time adaptive distributed controller to the bus load

Author

Antunes, Ana ; Pedreiras, Paulo ; Mota, Alexandre Manuel

Author_Institution

Inst. Politecnico de Setubal

Volume

1

fYear

2005

fDate

19-22 Sept. 2005

Lastpage

1084

Abstract

This paper presents a new method to allow more flexibility on the scheduling of messages across a fieldbus in overload situations. The method proposes the on-line adaptation of the sampling period to the bus load, trying to keep it as low as possible during overloads. The sampling period is allowed to change inside an interval corresponding to 4 to 10 samples per rise time. To assess the solution herein presented, a distributed adaptive control system was implemented in TrueTime, using the FTT-CAN protocol, for the communication infrastructure, a pole-placement controller and a model for the identification of plant parameters that takes into account the network-induced jitter

Keywords

adaptive control; controller area networks; distributed control; field buses; jitter; FTT-CAN protocol; communication infrastructure; distributed adaptive control system; field bus; message scheduling; network-induced jitter; pole-placement controller; real-time adaptive distributed controller; Adaptive control; Communication system control; Communication system traffic control; Control systems; Distributed control; Jitter; Processor scheduling; Programmable control; Protocols; Sampling methods;

fLanguage

English

Publisher

ieee

Conference_Titel

Emerging Technologies and Factory Automation, 2005. ETFA 2005. 10th IEEE Conference on

Conference_Location

Catania

Print_ISBN

0-7803-9401-1

Type

conf

DOI

10.1109/ETFA.2005.1612648

Filename

1612648