Research On Optimal Configuration Of Ethernet AVB Network Parameters In Intelligent Vehicle

With the rapid development of the vehicle industry and increasing requirements for the comfort,safety and entertainment of vehicle driving.The vehicle is developing towards the direction of intelligence,at the same time,the bandwidth and expansibility of the vehicular network communication are also higher.Ethernet network technology has born to solve the problem of increasing demand for network communication in vehicle intelligentization.Compared with the traditional CAN and FlexRay bus,Ethernet has the advantages of high bandwidth,low cost and strong expansibility,it is developing rapidly in the field of vehicle network,and has a great market prospect in the future.This thesis is supported by National Nature Science Fund.By collecting and reading domestic and foreign related research,the design mechanism of reserved bandwidth for Ethernet AVB network is studied.At first,the standard of Ethernet AVB network communication protocol is analyzed,and the topology structure applied in the intelligent vehicle is given.Then,the safety-critical class message in the network is transmitted by defining the scheduled traffic.On this basis,by analyzing the stream reservation protocol and the real-time of message transmission,the analysis of the worst response time of the network transmission message is proposed,also the calculation method and the derivation process are given.Secondly,considering that the IEEE standard reservation bandwidth configuration method may cause the network message to miss its deadline,the design method of over-reservation bandwidth is proposed.At the same time,the optimization model of Ethernet AVB parameters is established with the target of optimal over-reservation bandwidth,and with the constrain of real-time and IEEE standard maximum reserved bandwidth,also OAPO and OBPO algorithm is proposed to solve the model,and the evaluation of algorithm is given.Finally,the Ethernet AVB network design software is developed with the software tool,also the simulation experiment platform is set up and the experiment scheme is designed.Then the simulation experiment is carried out to conform the method of this thesis.The experimental results show that the proposed method can not only meet the schedule-ability requirements of the system,but also effectively improve the reliability of Ethernet AVB network.The research results of this thesis have theoretical significance and engineering value to improve the real-time and reliability of Ethernet AVB network in intelligent vehicle.