Research On Road Vehicle Detection Device Based On TMR Magnetic Sensor And Its Application

With the rapid development of the auto industry at home and abroad and the continuous increase of urban vehicles,the traffic problems between urban traffic and highways have become more and more serious.In response to various problems in the current road traffic,a growing number of countries and researchers have begun to explore and develop intelligent road management systems,called Intelligent Transportation Systems(ITS).ITS is the most direct and effective method for solving traffic jams,reducing accident rates,improving urban operating efficiency,and promoting social and economic development.Vehicle detection devices are the main source of scientific dispatching and control parameters for road traffic,it is also the most front-end equipment for obtaining road traffic conditions.Therefore,exploring and developing intelligent road traffic detection technologies and devices are critical to social development.For the defects of current common vehicle detection technologies,analyzing the research and development status of geomagnetic vehicle detection technologies at home and abroad,and combined with the detection theory and model analysis,this paper has completed the design of geomagnetic vehicle detection devices.At the same time,face to the current magnetic vehicle detection technology shortage,how to detect vehicle parameters in a timely,accurate and reliable way is also a key direction in this paper.The research work of this paper is as follows:(1)By analyzing vehicle detection theories and models and combining with the detection environment to determine the factors that affect vehicle detection accuracy,we propose corresponding scheme to solute these problems.In order to make data storage display and node command control easy,the PC monitor terminal of the detection device is designed and completed.(2)In view of the high power consumption and unstable communication problem of current geomagnetic vehicle detectors,this article has completed the device selection,circuit design and debugging of geomagnetic vehicle detection devices,the power consumption and performance test analysis is completed;To ensure the correct and stable data transmission of the entire detection device,a stable and reliable communication protocol is defined.(3)For the problems of low accuracy,easy error detection and missed detection of current geomagnetic vehicles,combining with the characteristics of current geomagnetic vehicle detection algorithms and proposing the algorithm of double-valued and double-gate vehicle flow detection,improved double-node complementary vehicle speed detection and vehicle classification.To verify the feasibility and stability of the algorithm,the field test of different road environments is completed.The test results showed that the accuracy rate of vehicle flow was as high as 98.58%,the accuracy rate of vehicle speed detection was 96.6%,and the accuracy of vehicle identification was 85.4%.