This paper introduced a basic data conversion concept having regard to the time critical transmission of the data. In a safety critical system it is mandatory that no data get lost to exclude serious consequences. It is possible to convert the CAN data into FlexRay data without losing any information, assuming the bus load on the CAN bus system does not exceed a certain limit. The introduced system in this paper contains three high-speed CAN bus ports and a single FlexRay channel. With this system it is possible to convert messages if the busload on each CAN channel does not exceed around 65 %. The FlexRay bus speed does not matter in this consideration, because it is fast enough to transfer the desired CAN messages. This busload limit varies if the number of CAN channels or the CAN bus speeds change. Further, the conversion time is heavily dependent on the used hardware (FlexRay and CAN controller as well as the microcontroller). Another important point discussed in this paper is the dependency of the FlexRay cycle length from the desired data to transmit. The longer the FlexRay cycle the more data can be transmitted. The usage of a processor with a higher performance then the HC12 will optimise the conversion process significant. Further the integrated CAN controllers contain three transmit and five receive buffers for CAN messages. Also another FlexRay controller can be used. The MFR4200 contains just 59 message buffers each with up to 32 bytes of data. For this application the hardware configuration is satisfactory. But for more complex applications (e.g. more CAN ports or more FlexRay channels) hardware with higher performance is required.


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    Titel :

    CAN connected to FlexRay


    Beteiligte:


    Erscheinungsdatum :

    2007


    Format / Umfang :

    8 Seiten, 9 Bilder, 4 Tabellen, 6 Quellen


    Medientyp :

    Aufsatz (Konferenz)


    Format :

    Print


    Sprache :

    Englisch




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