Optimisation of battery operating life considering software tasks and their timing behaviour

The battery operating life of embedded systems is to be optimised. This thesis considers multiple independent software tasks that are assigned the same processor, with a battery as power supply. The tasks are supposed to have hard deadlines and are to be scheduled earliest deadline first (EDF). Energy consumption is optimised using processor voltage and frequency scaling, per task or per task set, and processor shutdown, periodically or task-dependent. An event stream based hard real-time test ensures the feasibility of the solutions, and it provides low computational complexity. A best configuration in the sense of a long operating life is determined using a battery model. The model is evaluated with measurements on real batteries. A positive effect of pulsed discharge was not found for pulses in the range of 50us to 10ms. A simple battery model based on predischarge and termination current was found, with a maximal error of 6.7% for used battery samples.

Level thesis:degree_level

thesis.doctoral

Grantor dc:publisher

Universität Oldenburg

Year

2010

Author dc:creator

• Lipskoch, Henrik

• [Keine Schlagwörter von Autor/in vergeben.]

Repository record source_url

http://oops.uni-oldenburg.de/932

OAI identifier oai:identifier

oai:oops.uni-oldenburg.de:932