The traditional wiring connection of tractors faces difficulty in meeting the requirements of information sharing, high real-time performance, and high reliability among the electronic control units of electric tractors. This study takes a bifurcated power electric tractor as an example and designs the CAN communication network system of a bifurcated power electric tractor on the basis of ISO 11783 protocol. On the basis of the structural form and operation characteristics of the bifurcated power electric tractor, the CAN communication network nodes are divided, and the functions of each node are defined. This study aims at four common network topologies. A mathematical model is established on the basis of graph theory, the total information per second T and the node information per second Z of each structure are analyzed and compared, and the communication network of the electric tractor is designed by using high- and low-speed dual-bus structure. The communication protocol and system software design are developed on the basis of the ISO 11783 protocol. The hardware function and communication effect of the communication system are tested by dSPACE simulation platform and CANoe software. Test results show that the communication effect of the designed CAN bus network system is good, and the bus load rate is approximately 12%. This study provides a reference for the design of CAN communication network system for electric tractors.

拖拉机的传统接线方式难以满足电动拖拉机电子控制单元之间信息共享，实时性高和可靠性高的要求。本研究以叉式电动牵引车为例，并基于ISO 11783协议设计了叉式电动牵引车的CAN通信网络系统。根据分叉电动牵引车的结构形式和运行特性，划分了CAN通信网络节点，并定义了每个节点的功能。本研究针对四种常见的网络拓扑。基于图论，每秒总信息T和每秒节点信息Z建立数学模型对每个结构的结构进行了分析和比较，并采用高，低速双总线结构设计了电动拖拉机的通信网络。通信协议和系统软件设计是在ISO 11783协议的基础上开发的。通过dSPACE仿真平台和CANoe软件对通信系统的硬件功能和通信效果进行了测试。测试结果表明，所设计的CAN总线网络系统通信效果良好，总线负载率约为12％。该研究为电动拖拉机CAN通信网络系统的设计提供了参考。