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Wireless sensor network device for measuring car throughput based on high magnetic resistance and magnetic sensitive technology and its realizing method

A wireless sensor and network device technology, which is applied in traffic control systems, instruments, and traffic control systems of road vehicles, can solve the problems of video and microwave detection technology, difficulty in practicability, large loop coil area, troublesome maintenance, etc. The effect of wide operating linear range, large operating temperature range, and strong continuous working ability

Inactive Publication Date: 2008-08-13
JIAXING WIRELESS SENSOR NETWORKS CENT CAS
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  • Abstract
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Problems solved by technology

[0005] What the present invention aims to solve is that the existing video and microwave detection technology is difficult to be practical, the area of ​​the annular coil vehicle detector is too large, the cost is high, the road surface is seriously damaged during laying, and the maintenance is troublesome.

Method used

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  • Wireless sensor network device for measuring car throughput based on high magnetic resistance and magnetic sensitive technology and its realizing method
  • Wireless sensor network device for measuring car throughput based on high magnetic resistance and magnetic sensitive technology and its realizing method

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with the accompanying drawings and examples.

[0025] As shown in the figure, the wireless sensor network device for detecting traffic flow based on GMR magnetic sensitivity technology described in the present invention consists of a GMR sensor, a filter noise reduction unit, a differential amplifier unit, a DC bias unit, a secondary amplifier unit, and a DC blocking filter. Unit, hysteresis comparison unit, dynamic adjustment unit, control unit and radio frequency unit; the GMR sensor is connected to the filter noise reduction unit, the filter noise reduction unit is connected to the differential amplifier unit, the differential amplifier unit is connected to the DC bias unit, and the DC bias unit Connected to the secondary amplification unit, the secondary amplification unit is connected to the DC blocking filter unit and the control unit, the DC blocking filter unit is connected to the hysteresis com...

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Abstract

The invention provides a device which relates to road vehicle information measuring field. Said device comprises a GMR sensor, a filter denoising unit, a differential amplification unit, a DC bias unit, a second-level amplification unit, a blocking filter unit, a hysteresis comparison unit, a dynamic adjustment unit, a control unit and a RF unit. Said realization method is: a bias magnetic field is set beside the GMR sensor, the sensor output changes when a car passing by the magnetic field; the device judges the passed car through the changes by using the sensor, and transmits the measured vehicle flowrate into base station through RF and controls or saves. The device has broad prospect in road vehicle measuring, park management, road crossing management etc.

Description

technical field [0001] The invention relates to the field of road vehicle information detection, adopts the latest wireless sensor network technology, and specifically relates to a wireless sensor network device and an implementation method for detecting traffic flow based on GMR magnetic sensitivity technology. technical background [0002] With the rapid development of social economy and the general improvement of people's living standards, the automobile industry is developing rapidly. Although the construction of transportation infrastructure is changing with each passing day, the growth rate of transportation supply is still difficult to cope with the rapid growth of transportation demand brought by the number of motor vehicles. The contradiction between supply and demand is becoming more and more prominent, and various traffic problems caused by it are becoming more and more prominent. It is imperative to carry out scientific management of road traffic. Therefore, in r...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G08G1/042G08G1/065
Inventor 李中一吴波李保海张帆周璐巍鲍星合赵康
Owner JIAXING WIRELESS SENSOR NETWORKS CENT CAS
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