IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences
Online ISSN : 1745-1337
Print ISSN : 0916-8508
Regular Section
Adaptive Assignment of Deadline and Clock Frequency in Real-Time Embedded Control Systems
Tatsuya YOSHIMOTOToshimitsu USHIOTakuya AZUMI
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2015 Volume E98.A Issue 1 Pages 323-330

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Abstract

Computing and power resources are often limited in real-time embedded control systems. In this paper, we resolve the trade-off problem between control performance and power consumption in a real-time embedded control system with a dynamic voltage and frequency scaling (DVFS) uniprocessor implementing multiple control tasks. We formulate an optimization problem whose cost function depends on both the control performance and the power consumption. We introduce an adapter into the real-time embedded control system that adaptively assigns deadlines of jobs and clock frequencies according to the plant's stability and schedulability by solving the optimization problem. In numerical simulations, we show that the proposed adapter can reduce the power consumption while maintaining the control performance.

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© 2015 The Institute of Electronics, Information and Communication Engineers
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