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Managing Temporal Constraints in Control Systems
Publication Type:
Report - MRTC
ISRN:
MDH-MRTC-45/2002-1-SE
Abstract
Design and implementation of motion control applications include the mapping of control
design to real-time system implementation. Important parameters from control design include
deviation from nominal period time of an activity, end-to-end timing constraints, temporal
correlation between different sampling tasks, and constraints on temporal variations in
output. These parameters should also be considered in the real-time systems design, since
translating them to simple deadlines may lead to sub-optimal solutions. Many real-time
systems in industry today are based on pre-emptive priority based run-time systems, and
hence, it is highly desirable to fulfill the temporal requirements by correctly assigning
attributes such as priorities and offsets to the tasks executing in such systems. However, this
is a non-trivial mapping, which should be supported by appropriate methods and tools. In this
paper we propose a method, which by assigning priorities and offsets to tasks provides
guarantees that complex timing constraints are met. The method handles periodic and
sporadic tasks, shared resources, and varying execution times of tasks. We present the
method, which uses a genetic algorithm, together with simulation results, showing that the
proposed method is capable to efficiently handle complex constraints on task sets of realistic
sizes covering most embedded control systems.
Bibtex
@techreport{Sandstrom335,
author = {Kristian Sandstr{\"o}m and Christer Norstr{\"o}m},
title = {Managing Temporal Constraints in Control Systems},
number = {ISSN 1404-3041 ISRN MDH-MRTC-45/2002-1-SE},
month = {April},
year = {2002},
publisher = {MRTC},
url = {http://www.es.mdu.se/publications/335-}
}