Design And Development Of Automotive Ethernet System Based On The SOME/IP Protocol

With the exponential growth of automobile functions,the traditional vehicle network technology has encountered technical bottlenecks.The automobile industry has introduced Ethernet as the next generation vehicle network to solve the problems of insufficient bandwidth and slow transmission speed of the traditional vehicle network.Automotive Ethernet has become the research focus of the automobile industry.In the computer industry,Service Oriented Architecture(SOA)has been proved to be flexible,effective,reusable and extensible.Therefore,the automobile industry introduces service-oriented Automotive Ethernet to obtain the advantages of service-oriented architecture,thus reducing the difficulty of architecture system development.At present,BMW has applied service-oriented automotive Ethernet in the global main engine plant as the vehicle communication network in practice,which has proved the feasibility of service-oriented architecture Automotive Ethernet communication mode.Carry on the function demand analysis to the automotive Ethernet system and make the system plan.In order to realize the service-oriented architecture design of the automotive Ethernet system,Scalabe service-Oriented Middlewar E over IP(SOME/IP)protocol is selected as the application layer protocol of the automotive Ethernet system,and SOME/IP protocol is applied to the application layer of the automotive Ethernet system.The CANoe system is modeled and simulated using the combined approach of PREEvision and CANoe software.The PREEvision software was used to build the automotive Ethernet system model,configure the software to provide parameter data packets for the on-board Ethernet,build the automotive Ethernet system model based on SOME/IP protocol,realize the function of camera target monitoring,and export the above contents in the format of ARXML file.ARXML is loaded in CANoe software to generate the automotive Ethernet database.Then CAPL program is designed according to the system scheme to realize the system function simulation.The CANoe software is used to simulate the vehicle-borne Ethernet system.The simulation test platform is built,and the CANoe system is brought forward by combining the VN5640 interface card and CANoe software.The system delay is composed of the delay time of the initial waiting stage,the delay time of the repeated stage and the delay time of the main stage.Through the delay analysis of the worst case of the system,the system delay time is calculated to verify whether the test platform can operate normally.