电子论文-汽车速度测量系统的智能化设计.pdf
文本预览下载声明
汽车速度测量系统的智能化设计
1 2
于京生 ,容旭巍
(1. 石家庄学院电子信息工程系,河北 石家庄 050035 ;2.北京交通大学电气工程学院,
北京,100044)
摘 要:本文介绍了汽车行驶过程中速度参数的测量原理,建立了相关数学模型。并设计了
采用以嵌入式微处理器 MC9S12DP256B 为核心的智能数字式汽车组合仪表解决方案,具有
实时性好、反应灵敏、精度高等优点。系统可对汽车的车速参数进行实时测量和显示,并具
有安全报警功能。系统还预留了 SCI 和 CAN 总线接口,便于与汽车其他电子控制系统联接
通信功能的扩展。
关键词:速度测量 周期测量 安全报警
中图法分类号:TP319 文献标识码: A
文章编号:
Design of the Intelligent Instrument System in Measuring the Heavy Trucks Speed
1 2
YU Jing-sheng ,RONG Xu-wei
(1. Department of Electric Information Engineering, Shijiazhuang University, Shijiazhuang 050035, China ;2.
School of Electrical Engineering, Beijing Jiao tong University,Beijing,100044,China)
Abstract: The principle of how to measure the main automobile running parameters is discussed
in this paper and the correlative math model is given. And design a high reliability aptitude
instrument solution project of which the core is that the embed microprocessors based on
MC9S12DP256B are used is invented. This project has some advantages, such as good real time,
high design degree, and high sensitivity to response. Using this instrument, the real time measure
and display the parameter of vehicle speed can easily be made. The bus interface of I2C and CAN
is obligated in this instrument system. The aim of doing this is to make this system can easily
expand system function and can connect and communicate with other automobile electrical
control system.
Key words: speed measurement;cycle measurement ;Safety alarm
0 引言
汽车仪表是驾驶员与汽车进行信息交流的重要接口和界面,汽车的安全与经济行驶中起
着重要的作用。传统的汽车仪表大都采用机械或电气方式直接驱动表盘指针完成显示,其显
示信息量少、准确率低、可靠性差。最重要的是测量汽车行驶过程中车速要参数的车速表,
大多还采用机械传动机构,由软轴驱动指针偏转来指示车速,其缺点非常明显:低速时机械
式车速表的指针摆动剧烈,测量及显示精度不高;高
显示全部