Details

Autor(en) / Beteiligte

• Yu-Chu Tian
• Xiefu Jiang
• Levy, D. C.
• Agrawala, A.

Titel

Local Adjustment and Global Adaptation of Control Periods for QoC Management of Control Systems

Ist Teil von

• IEEE transactions on control systems technology, 2012-05, Vol.20 (3), p.846-854

Ort / Verlag

New York, NY: IEEE

Erscheinungsjahr

2012

Link zum Volltext

• IEEE_Xplore

Quelle

IEEE Xplore Digital Library

Beschreibungen/Notizen

• Linking real-time schedulability directly to the quality of control (QoC), the ultimate goal of a control system, a hierarchical feedback QoC management framework with the fixed priority (FP) and the earliest-deadline-first (EDF) policies as plug-ins is proposed in this brief for real-time control systems with multiple control tasks. It uses a task decomposition model for continuous QoC evaluation even in overload conditions and then employs heuristic rules to adjust the period of each of the control tasks for QoC improvement. If the total requested workload exceeds the desired value, global adaptation of control periods is triggered for workload maintenance. A sufficient stability condition is derived for a class of control systems with delay and period switching of the heuristic rules. Examples are given to demonstrate the proposed approach.