车载网络通讯协议Flexray网络的分析及搭建

Analysis and forming construction of an on-vehicle communication protocol Flexray network

替代传统CAN网络的车载网络通讯协议Flexray,可适应汽车动力和底盘系统的控制数据传输的要求:节点数多、数据容量大、实时性要求高、功能安全要求严、时间触发。本文分析了包括Flexray的时间层级和帧结构在内的关键部分;搭建一个简单的3节点Flexray网络,并分析了Flexray网络参数的配置要求(包括全局参数和局部参数)。结果表明:用所搭建的flexray三节点网络,根据假定的参数配置,展示了三节点通讯的实际数据传输情况,验证了所搭建网络的可实现性,为搭建更复杂的网络提供参考。

The on-vehicle communication protocol Flexray, which can replace the traditional network CAN, can adapt to the control-data communication demand of power-train and chassis on automobile due to advantages of more nodes, wider band-width, real-time, safety function and time-triggered. This article analyzes the detail of the time level and frame construction of the key part of the network, sets up a simple 3-node Flexray network, and analyzes the configuration of the protocol parameters including global parameters and local parameters. A 3-node Flexray network was built. The results demonstrate the actual communication of the pre-assumed signals according to the assumed parameters, therefore, proving the achievability of the constructed network, which can be used as a reference to build more complex networks.