【摘要】 为使高速公路车辆参数测量准确、稳定与经济实用,并实现公路交通的智能化管理,本文提出一种利用巨磁阻传感器作为车辆参数检测元件,以PIC16F74单片机为信号处理与控制核心构成一种新型的高速公路车辆监测系统。文中给出了系统设计方案,并详细介绍了车辆参数监测系统的基本原理,信号处理系统的硬件电路结构与软件流程,并给出现场实验测试数据。实验结果表明,本系统对高速公路上车辆流量的测量精度达100%,对车辆行驶速度检测的精度可达95%以上,可以完全取代目前广泛使用的地埋线圈测量系统。更多还原

【Abstract】 In order to make the vehicle parameter detection accurate,steady,economical and practical,and accomplish the intelligent control for the highway traffic,this paper introduces a new kind of high-way vehicle detection system.it uses magnetoresistive sensors as detection element,and uses single chip processor of PIC16F74 as the signal processing and control center.A system design plan is given in this article,and discusses the fundamental principle for vehicle parameter detection system,and the hardware and software of the signal processing system.Finally,the testing results are given.The result of test shows that this system reaches the precision of 100% about vehicle rate of flow and 95% about vehicle speed for high-way,it can replace the traditional underground winding with this detection system completely.更多还原