重型拖拉机CAN通信网络设计

Design of CAN communication network for heavy duty tractor

针对重型拖拉机众多电控单元之间需要实时信息共享的需求,设计了包含整机控制器、发动机控制器、变速箱控制器、电控提升控制器、精准作业控制器以及仪表等节点的整机CAN总线通信网络;基于SAE J1939协议和ISO 11783协议制定了拖拉机CAN网络通信协议;通过CANoe进行了整机CAN总线网络负载率的分析,确定了整机双CAN网络的总线拓扑结构;实车测试了拖拉机的挡位识别、发动机起动、油门踏板开度和四轮驱动等功能。测试结果表明,500 kb/s波特率的双CAN网络拓扑结构以及整机通讯协议能够实现拖拉机的所有功能,能够满足重型拖拉机的作业性能。

Aiming at the need of real-time information sharing between many electronic control units of heavy-duty tractors,the whole machine CAN bus communication network is designed,including vehicle control unit,engine control unit,transmission control module,and hitch control module,precise-operation control module,and instrument cluster module.Based on the SAE J1939 protocol and ISO 11783 protocol,the tractor CAN network communication protocol was developed.The network load rate analysis of the whole machine was carried out by CANoe,and the bus topology of dual CAN network was determined.The real vehicle tests the tractor′s gear recognition,engine start,accelerator pedal opening,and four-wheel drive.The test results show that the dual CAN network topology with 500 kbps baud rate and the whole machine communication protocol can realize all the functions of the tractor,fully satisfying the working performance of the heavy tractor.