高速公路电子限速牌的实用改进型设计

Improvement on electronic velocity-limited guidepost in freeway

针对目前高速公路限速提示牌无法很好地对司机起到警示作用的现状,本文设计了一套基于MCS-51单片机,包含光电检测装置和显示装置的电子提示系统。它不仅能方便设置并显示该路段的限制速度,以完成普通电子限速牌的限速提示功能,同时能将测得的车速实时显示,并自动判断是否超速。其扩展功能还可以实现记录不同时段的车流量。另外它低廉的造价和经实验证明较高的精度大大提高了它的可用性。

Because of the poor function of the present velocity-limited guidepost on the freeway, a more effective one is designed, which is based on MCS-51 single chip and made up of optical-electronic measuring device and display system. It can not only achieve the function of prompting the limitation velocity as traditional guidepost, but also display the real time velocity of the passing by cars and judge whether the velocity is over the limitation of velocity automatically. Furthermore,recording the traffic flux at various time intervals is an extending function. Above all, the practicability has been validated by its low fabrication cost and high precision.