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Sensors 2009, 9(9), 6795-6818; doi:10.3390/s90906795

On the Application of Different Event-Based Sampling Strategies to the Control of a Simple Industrial Process

1,* , 2
1 Department of Computer Science and Automatic Control, UNED, C/ Juan del Rosal, 16, 28040 Madrid, Spain 2 National University of San Luis, San Luis, Argentina
* Author to whom correspondence should be addressed.
Received: 7 July 2009 / Revised: 20 August 2009 / Accepted: 24 August 2009 / Published: 27 August 2009
(This article belongs to the Special Issue State-of-the-Art Sensors Technology in Spain)
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This paper is an experimental study of the utilization of different event-based strategies for the automatic control of a simple but very representative industrial process: the level control of a tank. In an event-based control approach it is the triggering of a specific event, and not the time, that instructs the sensor to send the current state of the process to the controller, and the controller to compute a new control action and send it to the actuator. In the document, five control strategies based on different event-based sampling techniques are described, compared, and contrasted with a classical time-based control approach and a hybrid one. The common denominator in the time, the hybrid, and the event-based control approaches is the controller: a proportional-integral algorithm with adaptations depending on the selected control approach. To compare and contrast each one of the hybrid and the pure event-based control algorithms with the time-based counterpart, the two tasks that a control strategy must achieve (set-point following and disturbance rejection) are independently analyzed. The experimental study provides new proof concerning the ability of event-based control strategies to minimize the data exchange among the control agents (sensors, controllers, actuators) when an error-free control of the process is not a hard requirement.
Keywords: send-on-delta; event-based control; PI controller send-on-delta; event-based control; PI controller
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Sánchez, J.; Guarnes, M.Á.; Dormido, S. On the Application of Different Event-Based Sampling Strategies to the Control of a Simple Industrial Process. Sensors 2009, 9, 6795-6818.

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