混合动力电动车CAN协议的实时性研究  

Study on real time performance of CAN protocol for hybrid electric vehicles

作　　者：罗禹贡[1] 董珂[1] 李克强[1] 连小珉[1] 

机构地区：[1]清华大学汽车安全与节能国家重点实验室,北京100084

出　　处：《高技术通讯》2006年第4期387-390,共4页Chinese High Technology Letters

基　　金：863计划（2003AA501323）资助项目.

摘　　要：在研究了控制器局域网络（CAN）通讯模型的基础上，提出了一种新的基于Poisson过程和几何分布的错误统计模型,并分析了模型参数与节点发送误码率的关系。在此基础上，运用建立的数学模型研究了混合动力电动车网络协议的通讯实时性,详细分析了错误统计模型中参数λ、波特率、传送周期和数据场长度4个重要因素对信息传送失败概率的影响.最终提出了基于CAN的车载控制网络的设计原则，如尽量采用多发送缓存的CAN控制器，尽可能延长传送周期和尽量压缩数据场长度等。Based on the study of the existed controller area network （CAN） communication models, a new error model based on Poisson process and geometric distribution is set up in this paper. The relations between model parameters and transmission bit error rate are presented. The real-time performance of the CAN protocol for hybrid electric vehicles is analyzed using the established model, and the relation between the parameter λ, baud rate, transmitting period and DLC and the bit error rate are presented. Finally, some design principles of CAN application layer protocol, such as using the CAN controller with multi transmit buffer scheme, lengthening the transmitting period and reducing the DLC by all means are proposed.

关 键 词：CAN 实时性 混合动力电动车 

分 类 号：TP273[自动化与计算机技术—检测技术与自动化装置]