FlexRay通信网络的车载信息终端嵌入式系统设计

Design of Vehicle Information Terminal Embedded System Based on FlexRay Communication Network

针对当前车载信息终端系统存在传输能耗较大、传输时间较长、丢包率较高的问题,设计FlexRay通信网络的车载信息终端嵌入式系统。采用GPRS模块接入通信网络车载信息移动终端,选用MC9S12XF512芯片微处理器控制硬件电路,根据嵌入式Linux的车载信息终端连接网络信息数据,完成车载信息终端嵌入式系统硬件设计。通过计算FlexRay通信网络周期结构中动态段,连接车载网络通信标准和信息数据,引入时间因子降低丢包数,设计相应终端缓存管理机制,确保网络信息终端驱动程序有效运行,实现车载信息终端嵌入式软件设计。实验结果表明,所提系统的车载信息终端传输能耗较小,能够有效缩短传输时间,降低丢包率。

Aiming at the problems of high transmission energy consumption,long transmission time and high packet loss rate in the current vehicle information terminal system,the vehicle information terminal embedded system based on FlexRay communication network is designed. GPRS module is used to access the vehicle information mobile terminal of communication network,MC9S12XF512 chip is used to control the hardware circuit,and the vehicle information terminal of embedded Linux is used to connect the network information data to complete the hardware design of the vehicle information terminal embedded system. By calculating the dynamic segment of FlexRay communication network cycle structure,connecting the vehicle network communication standards and information data,introducing time factor to reduce the number of packet loss,designing the corresponding terminal cache management mechanism,ensuring the effective operation of network information terminal driver,and realizing the vehicle information terminal embedded software design. Experimental results show that the proposed system can effectively shorten the transmission time and reduce the packet loss rate.