Quantifying and suppressing the measurement disturbance in feedback controlled real-time systems

• Published in: Real-time systems Vol. 40; no. 1; pp. 44 - 76
• Main Authors: Amirijoo, Mehdi, Hansson, Jörgen, Gunnarsson, Svante, Son, Sang H.
• Format: Journal Article
• Language: English
• Published: Boston Springer US 01.10.2008; Springer Nature B.V
• Subjects: Adaptive scheduling; Automatic control; Communications Engineering; Computer Science; Computer Systems Organization and Communication Networks; Control; Control systems; Datasets; Disturbances; Dynamical systems; Dynamics; Feedback control; Information technology; Informationsteknik; Mathematical analysis; Mathematical models; Measurement disturbance; Mechatronics; Networks; Performance and Reliability; Real time; Reglerteknik; Retarding; Robotics; Special Purpose and Application-Based Systems; System disturbance; TECHNOLOGY; TEKNIKVETENSKAP; Time varying control systems; Adaptive scheduling; System disturbance; Feedback control; Measurement disturbance
• ISSN: 0922-6443; 1573-1383; 1573-1383
• DOI: 10.1007/s11241-008-9048-3

In the control of continuous and physical systems, the controlled system is sampled sufficiently fast to capture the dynamics of the system. In general, this property cannot be applied to the control of computer systems as the measured variables are often computed over a data set, e.g., deadline miss ratio. In this paper we quantify the disturbance present in the measured variable as a function of the data set size and the sampling period, and we propose a feedback control structure that suppresses the measurement disturbance. The experiments we have carried out show that a controller using the proposed control structure outperforms a traditional control structure with regard to performance reliability.