基于CAN总线的汽车车身电器网络实验台的设计

针对网络技术在国内汽车车身尚无应用的现状,提出了一种基于CAN总线的分布式汽车车身网络系统的建立方法,并将其应用于桑塔纳2000型轿车车身电器实验台上。将车身电器按区域划分为9个部分,通过CAN智能节点连接到总线上。对总线参数进行设置,包括节点ID、位定时、位同步、信道延迟等,使得各节点能够有效进行通信。选用89S51单片机和SJA1000CAN控制器设计CAN智能节点。试验室测试时采用PCI-5121智能CAN接口卡将上位机连入总线系统中,分别以单帧和多帧2种方式进行通讯,普通双绞线为通信介质,通讯时间24 h,节点传输速率为40 kbit/s,通讯成功率100%。系统能够实现节点间的可靠通信,达到预期的设计目标。

A test-bed design for electrical network of vehicle body based on CAN bus

As the application of network technique to vehicle body in China is few,a constructing method for a distributed network system of vehicle body based on CAN bus was brought forward and was used in a wiring test-bed for vehicle body of SATANA 2000 car.The wiring system on the vehicle body were divided into nine parts according to their different locations and joints in Bus via CAN intelligent nodes.By setting the parameter of Bus,such as ID,time,rate,delay and so on,the nodes can communicate with each other successfully.The CAN intelligent node was designed by a 89S51 Single-Chip-Microcomputer and a SJA1000 CAN controller. By CAN interface card PCI-5121,we joined upper PC in the system and used it to have a communicate test with nodes in modes of single frame and multi-frame.Taking a twisted-pair as corresponding medium,a reliable communication was realized when the rate was 40?kbit/s and the communicating time was 24 hours.