工程机械分布式控制系统CAN总线节点设计  

Node Design of CAN Bus in Distributed Control System of Construction Machinery

作　　者：冯娟[1] 李孝禄[1] 王君[1] 

机构地区：[1]中国计量学院机电工程学院

出　　处：《工程机械》2007年第12期46-51,133-134,共6页Construction Machinery and Equipment

摘　　要：将CAN现场总线技术应用于工程机械分布式控制系统中,提出了该分布式控制系统的结构模型,在此基础上,详细介绍了人机界面节点、主操作台节点及其它子节点的具体功能及结构特点;为简化系统硬件设计及提高系统抗干扰性能,采用TI公司高性能的16位DSPTMS320LF2407作为核心器件来实现工程机械分布式控制系统的设计,利用TMS320LF2407芯片内置的CAN控制器来构成CAN总线网络;完成了系统各个节点的硬件设计,并在硬件上采用光电隔离的方法,以防止从CAN总线上窜入的干扰信号;完成了各节点的软件设计,并在软件上采用定时测试的方法来保证通信过程中数据传输可靠。通过模拟试验对各节点间通信的稳定与可靠性进行了检验。试验结果表明:该分布式控制系统软件及硬件稳定可靠,主节点能够与子节点间进行可靠的数据传输与通信,实现了在线远程监控。The CAN field bus technology is applied to distributed control system of construction machinery for the first time and a structural model of the distributed control system is suggested. On the basis of that, concrete functions and structural characteristics of HCI nodes, main console nodes and other sub-nodes are described in details. With the purposes of simplifying hardware design and enhancing anti-interference function of the system, a high performance, 16-bit DSP TMS320LF2407 is used as a kernel element to realize the design of distributed control system for construction machinery. CAN controller embedded in TMS320LF2407 chip is used to construct CAN bus network. Hardware design for every node in the system is fulfilled and a photoelectric isolation method is employed on the hardware to protect CAN bus aganist interfering signals. Software design for each node is also fulfilled and a timing measurement method is employed on the software to ensure reliable data delivering in communication. Communication stability and reliability between nodes are verified through a simulation test. The results show that software and hardware in the distributed control system are stable and reliable, data delivering and communicating between main node and sub-nodes are reliable so that remote monitor on-line can be realized.

关 键 词：工程机械 分布式控制系统 CAN总线 DSP 主节点 子节点 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]