拖拉机CAN通信技术研究与试验

Research and Experiment on Tractor CAN Communication Technology

针对拖拉机控制实时性低和产品间电气匹配性差等问题,以拖拉机电控机械式自动变速器(AMT)控制器为例,基于ISO 11783协议对其控制器局域网(CAN)接口硬件电路及应用层通信协议进行了设计,实现了AMT_ECU与发动机ECU的实时数据通信。利用Allegro PCB软件对控制器信号反射和串扰进行了仿真分析,使用CANcase XL接口卡将AMT控制器实物接入CAN。利用CANoe软件建立数据库、配置虚拟仪表,使用CAPL语言编程,搭建了以拖拉机AMT控制器为真实节点的系统半实物仿真平台,并对总线系统通信功能和负载率情况进行了监测。测试结果表明:拖拉机AMT控制器CAN接口符合电气硬件要求,可实现与发动机ECU进行CAN信息的发送与接收。

In view of the problems of bad real-time in tractor control,and poor matching performance in electric pressure between products,a tractor automatic mechanical transmission( AMT) controller was used as example,to design the controller area network( CAN) interface hardware circuit and the application layer communication protocol of AMT controller on the basis of ISO 11783. The real-time data communication between AMT_ ECU and engine ECU was achieved. The reflection and crosstalk of controller signal were simulated by the Allegro PCB software. The AMT controller was connected to the CAN by using CANcase XL interface card. The semi-physical simulation platform with tractor AMT controller as a real node was completed by using CANoe software to establish the database,configure virtual instrument and CAPL programming. The communication function and the peak load of the bus system were analyzed. The simulation results show that the CAN interface of tractor AMT controller meets the electric hardware demands. The CAN information sending and receiving between AMT and engine are realized.