The timing issues are very important for the high speed distributed control system like a x-by-wire system to ensure their consistency of the operation with linked ECUs. The operations of all the ECUs in the system have to be synchronized within same time zone. The joint development of the 'FlexRay' standard by BMW, Daimler, Motorola and Philips started in 2000 to fulfill the requirements for future in-vehicle control applications including the combination of higher data rates, deterministic behaviour and the support of fault tolerance. In this paper the FlexRay communication is explained and compared with CAN protocol. Then an optimal task schedule which is synchronized with FlexRay global time and the FlexRay communication schedule for high speed distributed control is suggested, and is implemented and verified in the test bench of independent Steer-By-Wire system. The FlexRay Consortium has been developing the FlexRay protocol for future in-vehicle network system. Nevertheless there are some problems for applying to the real serial product because of the price and technical problem and so on, but there is no doubt that the FlexRay will be a good solution for future in-vehicle network to control the high speed distributed system. This paper shows how the FlexRay can be used for the high speed distributed control system by applying and verifying the schedule of the FlexRay communication and time triggered task to the independent steer-by-wire system.
Development of the high speed distributed control system based on flexray: The independent steer-by-wire system
2008
8 Seiten, 5 Bilder, 5 Tabellen, 7 Quellen
Conference paper
English
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