摘要： 交通物联网领域存在对道路车流信息监测的业务需求，将地感线圈布设于道路上可以感知车辆驶入的信息，为交通物联网提供初始数据。针对地感线圈工作场景，阐述了地感线圈工作原理。在此基础上，设计了一种基于地感线圈的车辆驶入检测信号的电路。该信号采集电路主要由调谐振荡电路、波形整形电路、微处理器等部分组成，介绍了各模块的设计要点。通过PSpice软件仿真表明该电路可有效采集地感线圈状态值变化，从而检测车辆驶入，在交通物联网领域具有较高的实用价值和应用前景。

中图分类号： U491.1+16
文献标识码： A
DOI：10.16157/j.issn.0258-7998.212170
中文引用格式： 周亚，戴伟，张鑫，等. 基于地感线圈的车辆驶入检测电路设计及仿真[J].电子技术应用，2022，48(6)：107-111.
英文引用格式： Zhou Ya，Dai Wei，Zhang Xin，et al. Design and simulation of vehicle entry detection circuit based on ground induction coil[J]. Application of Electronic Technique，2022，48(6)：107-111.

Design and simulation of vehicle entry detection circuit based on ground induction coil

Abstract： In the field of traffic Internet of Things, there is a business demand for road traffic flow information monitoring. The ground sensing coil is arranged on the road to sense the information of vehicles entering and provide initial data for the traffic Internet of Things. According to the working scene of ground induction coil, the working principle of ground induction coil is described. On this basis, a circuit of vehicle entry detection signal based on ground induction coil is designed. The signal acquisition circuit is mainly composed of tuning oscillation circuit, waveform shaping circuit and microprocessor. The design points of each module are introduced. PSpice software simulation shows that the circuit can effectively collect the state value change of ground sensing coil, so as to detect vehicle entry. It has high practical value and application prospect in the field of traffic Internet of Things.

Key words : ground induction coil；entry detection；circuit design；PSpice simulation