基于单片机的车流量测量系统设计.docVIP

摘要 近年来，随着我国经济建设的高速发展，机动车辆拥有量也在急剧增长，交通流量日益增大，了解路况交通实时信息让司机选择道路通畅的路段是解决道路拥堵问题的一个重要手段。因此，研究开发适合我国交通现状和具有稳定性好的检测设备变得尤为重要。 本文介绍了一种基于感应线圈的道路车辆测量方法。该方法利用感应线圈车辆检测器对车辆的电磁感应特性进行数据采集，通过对振荡的频率计数获得通行车辆的信息（车流量这里指通过车辆的个数），再通过显示电路显示出来。 信号产生电路采用LC电容三点式振荡电路，此电路主要用来产生正弦信号. 文中给出了以AT89C51单片机为核心的车流量检测系统的硬件和软件框图，并进行了简单的实验，结果表明该检测系统稳定可靠，检测精度符合要求。 基于LC振荡电路与51系列单片机组成的环形线圈检测器，不仅经济，还能够保证系统的检测精度和抗干扰性为进一步应用于实际打下了的基础。 关键字:AT89C51单片机 、感应式环形线圈、LC振荡电路、数码显示 Abstract In recent years, the quantity of vehicles and the traffic flow increase rapidly with the development of China economy.So it is important of the drivers to know the real-time information of the traffic system.Therefore ,it is also very important to research a stable equipment which can detect the traffic situation. The paper introduces a device of vehicle based on an induction loop-coil.The device collects the data of electromagnetic induction characteristics with the inductive loop-coil.This device can obtain the information of vehicles by measuring the frequency of the oscillator circuit,and displays it thought the display circuit. The signal circuit of the device adopts LC oscillator circuit,and this oscillator circuit is mainly used to produce sinusoidal signal.The paper produces the hardware electric circuit and the software diagram of the system of measuring vehicle flux which takes the STC89C52 as the core,and take some simple experiments,finally indicated that the system of measuring vehicle flux is able to stably and reliably work and the examination precision meet the requirements. The inductive loop-coil vehicle detector which is based on LC oscillator circuit and MCU, is economic, accurate and stable. It laid a solid foundation for further practical application. Keyword：TC89C52 single chip microcomputer、induction loop-coil、 LC oscillator circuit、Digital display 第1章序言 2 1.1 课题背景 2 1.2 课题研究的目的和意义 2 1.3 课题研究的发展趋势 2 1.4 本文主要研究内容 3 第2章 系统主要研究内容 3 2.1 车辆检测原理 4 2.2 系统硬件原理框图 6 2.3 系统软件原理框图 7 第3章 硬件设