Improving Quality-of-Control Using Flexible Timing Constraints: Metric and Scheduling Issues

Closed-loop control systems are dynamic systems subject to perturbations. One of the main concerns of the control is to design controllers to correct or limit the deviation that transient perturbations cause in the controlled system response. The smaller and shorter the deviation, the better the achieved performance. However, such controllers have been traditionally implemented using fixed timing constraints (periods and deadlines). This precludes controllers to execute dynamically, accordingly to the system dynamics, which may lead to sub-optimal implementations: although higher execution rates may be preferable when reacting to perturbations in order to minimize the response deviations, they imply wastage of resources when the system is in equilibrium. In this paper we argue and demonstrate that the responsibility of maximizing the performance of closedloop systems relies on both the controller designer and the scheduler. We show that the dynamic optimization of the quality of the c...

• Type: Conference
• Year: 2002
• Where: RTSS
• Authors: Pau Martí, Josep M. Fuertes, Gerhard Fohler, Krithi Ramamritham
• Keywords: Control Systems, Control Task, RTSS 2002, Timing Constraints, Transient Perturbations