DocumentCode :
1775761
Title :
Periodic charging scheme for fixed-priority real-time systems with renewable energy
Author :
Bambagini, Mario ; Aydin, Hakan
Author_Institution :
Scuola Superiore Sant´Anna, Pisa, Italy
fYear :
2014
fDate :
18-20 June 2014
Firstpage :
1
Lastpage :
10
Abstract :
Energy harvesting systems are gaining increasing importance in the embedded systems domain, as they provide an effective solution to bridge the gap between the energy supply and demand. However, the variable nature of the energy supply rate due to the environmental conditions creates serious challenges for embedded real-time systems targeting predictability. This paper presents a proactive and highly predictable framework, called Periodic Charging Scheme (PCS), for fixed-priority real-time systems with renewable energy. The main idea of the algorithm is to plan in advance for periodic charging and discharging of the battery to avoid energy outage, while still meeting the timing constraints. The algorithm is specifically designed to exploit the low-power states of modern processors, to enable effective power state transitions when the battery is recharged on a periodic basis. We also offer online enhancements to opportunistically extend the duration of charging phases and improve the responsiveness of the potential non-real-time workloads without compromising feasibility. Extensive simulations show that the proposed approach outperforms the state-of-the-art algorithms in terms of the number of task sets that meet the timing constraints under specified energy profiles, when a realistic power model with state transition overheads is assumed.
Keywords :
battery management systems; embedded systems; energy harvesting; renewable energy sources; secondary cells; PCS; battery; embedded real-time systems; energy demand; energy harvesting systems; energy supply rate; environmental conditions; fixed-priority real-time systems; low-power state transitions; periodic charging; periodic charging scheme; periodic discharging; renewable energy; Batteries; Load modeling; Real-time systems; Switches;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Industrial Embedded Systems (SIES), 2014 9th IEEE International Symposium on
Conference_Location :
Pisa
Type :
conf
DOI :
10.1109/SIES.2014.6871179
Filename :
6871179
Link To Document :
بازگشت