Research Of FlexRay Vehicle Network Scheduling Algorithm

The rapid development of automotive electronics and vehicle network gave birth to the high-speed, high fault tolerance, deterministic vehicle bus standards --FlexRay, which could reduce the development and production costs of the vehicles, simplify the process of adding electronic control system to vehicle, and improve features of vehicle such as safety and comfortable. This subject is supported by the research projects of Ministry of Education study of Guangdong Province, to the core of FlexRay network, searched and collected a large number of domestic and foreign research data and information, analyzed the communication mechanisms of FlexRay, and analyzed the key factors that might affect the performance of FlexRay network, researched the massage scheduling of FlexRay network. It is valuable and meaningful for the application of FlexRay technology.Given the requirements of the vehicle network performance on real-time, reliability, openness, commonality and efficiency, analyzed the factors that might affect the real-time transmission of data in the FlexRay network. and more reasonable to assigned the time of static segment and dynamic segment in the FlexRay communication cycle, designed the periodic scheduling table of massages As schedulability is one of the important parameters to evaluate the performance of network, researched the critical technology of FlexRay in the massage scheduling Based on the analysis and comparison of several typical FlexRay vehicle network scheduling algorithms, using the bandwidth reservation idea, improved the scheduling algorithm of FlexRay dynamic segment. Under the conditions of existing experiment in the laboratory, designed the node of FlexRay network, proposed the communication solutions of the FlexRay network system, analyzed the requirements of the system, configured the parameters of FlexRay communication cluster, to do the simulation experiments with the professional development tools of auto bus--CANoe.FlexRay and the database development tool --DaVinci Network Designer.FlexRay. Finally, verified the feasibility and effectiveness of the improved scheduling algorithms.The significance of this research is to ensure the real-time and reliability of the FlexRay network communication, and to more efficient use of network bandwidth, while reducing the delay of the real-time massages in the transmission process and computational load of the system.