Development of strategies for reducing the worst-case message response times on the Controller Area Network

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2012

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Çelik, Vakkas

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The controller area network (CAN) is the de-facto standard for in-vehicle communication. The growth of time-critical applications in modern cars leads to a considerable increase in the message tra c on CAN. Hence, it is essential to determine e cient message schedules on CAN that guarantee that all communicated messages meet their timing constraints. The aim of this thesis is to develop o set scheduling strategies that ﬁnd feasible schedules for higher bus load levels compared to conventional CAN scheduling approaches. We formulate the o set scheduling as a constraint optimization problem that maximizes the sum of message slacks where slack is deﬁned as the di erence between the deadline and the worst-case response time (WCRT) of a message. The constraint to ensure the feasibility of the schedules is keeping all slacks positive. In this respect we propose two heuristic o set scheduling algorithms which integrate an existing method for the WCRT analysis in the schedule computation. We apply our algorithms to various examples and compare the results with a well-known o set scheduling algorithm. The results show that our algorithms can generate feasible schedules at signiﬁcantly high loads with run times shorter than 5 minutes.

Subject Keywords

Controller Area Network (Computer network)

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http://etd.lib.metu.edu.tr/upload/12614075/index.pdf
https://hdl.handle.net/11511/21288

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Graduate School of Natural and Applied Sciences, Thesis

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Citation Formats

V. Çelik, “Development of strategies for reducing the worst-case message response times on the Controller Area Network,” M.S. - Master of Science, Middle East Technical University, 2012.