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Browsing by Author "Karakaya, Utku"

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    Conference Object
    Citation Count: Schmidt, K...et al. (20109. "An Experimental Study of the Flexray Dynamic Segment",Ifac Proceedings Volumes (Ifac-Papersonline), Vol. 43, No. 7, pp. 413-418.
    An Experimental Study of the Flexray Dynamic Segment
    (IFAC Secretariat, 2010) Schmidt, Klaus Werner; Schmidt, Ece G.; Demirci, Ali; Yürüklü, Emrah; Karakaya, Utku
    It is expected that the time-triggered FlexRay bus will replace the event-triggered Controller Area Network (CAN) for the high-speed in-vehicle communication in future automobiles. To this end, FlexRay provides a static segment for the transmission of periodic messages and a dynamic segment that is suitable for exchanging event-based (sporadic) messages. In this paper, we experimentally evaluate the operation of the FlexRay dynamic segment. In particular, we study how the maximum and average message delays are affected if the length of the dynamic segment, the message payload, the utilization of the dynamic segment and the priority assignment changes. Our experiments are carried out on a FlexRay network with 6 nodes.
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    Citation Count: Schmidt, K.W...et al. (2016). Controller area network with priority queues and FIFO queues: improved schedulability analysis and message set extension. International Journal Of Vehicle Design, 71(1-4), 335-357. http://dx.doi.org/10.1504/IJVD.2016.078786
    Controller area network with priority queues and FIFO queues: improved schedulability analysis and message set extension
    (Inderscience Enterprises LTD, 2016) Schmidt, Klaus Werner; Alkan, Burak; Schmidt, Ece Güran; Karani, Duygu Culum; Karakaya, Utku; 17337
    Controller area network (CAN) enables communication of electronic control units (ECUs) via messages using priority-based arbitration, which requires the implementation of priority queues (PQs) in the ECU device driver. Nevertheless, it is possible that not all ECUs on a CAN support PQs but use FIFO queues (FQs) instead. In this case, the classical CAN scheduling model with PQs is not suitable for the computation of message worst-case responsetimes (WCRTs) that are essential for verifying the correct vehicle operation. This paper considers an existing scheduling model for CAN with both PQs and FQs. First, an improved algorithm for speeding up the WCRT computation is proposed. Second, the practical case where an existing CAN message set is extended by new messages is addressed. An original algorithm for assigning priorities to new messages while keeping the priority order of existing messages is developed. Both algorithms are evaluated by computational experiments.