基于线圈的车速及车流量检测器设计

为提高对车辆检测的准确度,设计了一种新型的基于线圈的车速及车流量检测系统。本设计基于Cortex-M3内核的高性能ARM平台,选通工作模式实现分时段采集多路通道信号,系统可连接至数据中心,实现远程监控。在软件方面,利用队列数据结构,按照先进先出的原则对上游线圈与下游线圈的信号进行配对。此外,本系统采用了求导法,可降低对于大型车、拖挂车的误检,弥补线圈检测技术上的缺陷。测试表明,本车辆检测器具有良好的可靠性,检测精度高,具有很高的实用价值。

Design of the speed and vehicle flux detector based on loop-coil

In order to improve the accuracy of vehicle detector, a new embedded system based on loop was designed.This system works on high-performance hardware ARM based on Cortex-M3,collects signal from multi-road by time interval under the selecting mode. The system can connect to data center and realize remote monitoring. With of data structure of queue, matching the former loop to the latter loop on the basis of First Input First Output(FIFO). In addition, the system uses the method of derivation to reduce the mistake about large vehicles and trailers, which make up for the shortcoming of detectors based on loop-coil. The application results show that the detector is reliable, of greatSaccuracy and has a fine practical value.