Vehicle Counting Pulse Generation Device Based on Geomagnetic Sensing
A technology of counting pulses and geomagnetic sensing, which is applied to traffic control systems, instruments, and traffic control systems of road vehicles, and can solve problems such as narrow pulse interference of counting pulses, different magnetic field disturbances, and different waveforms.
Active Publication Date: 2020-07-31
蚌埠瑞众传感系统工程有限公司
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However, due to different vehicle models, the magnetic field disturbances are different. The patent publication number CN 101923781 A mentions that since the geomagnetic sensor detects the change of the geomagnetism when the vehicle passes by, the distribution of the metal of the vehicle along the direction of the vehicle is The length of the vehicle, the height of the chassis, and the structure of the engine will all affect the size of the geomagnetism. In addition, the vehicle passes by at a certain speed, which will cause the waveform to have different shapes.
After comparing and judging magnetic field disturbances of different sizes and shapes, there is narrow pulse interference in the output vehicle counting pulse
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[0021] The present invention will be further described below in conjunction with accompanying drawing.
[0022] The geomagnetic sensor detects the change of the geomagnetism when the vehicle passes by, so the distribution of the metal of the vehicle along the direction of travel, the length of the vehicle, the height of the chassis, and the structure of the engine will all affect the size of the geomagnetism. In addition, the vehicle passes by at a certain speed. Make the waveform graph have a different shape. figure 1 A schematic diagram of the vehicle magnetic field disturbance waveform data obtained by the geomagnetic sensor, and in the magnetic field disturbance caused by different models, figure 1 The magnetic field disturbance magnitude of medium vehicles is at a moderate level. figure 1 Among them, Ua is the average value of the output u of the geomagnetic sensor, or the output value when no vehicle passes by, Up1, Up2, and Up3 are the three positive magnetic field dis...
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A vehicle count pulse generation device based on geomagnetic sensing includes a geomagnetic sensor and an interference pulse filter circuit composed of a reversible amplitude limiting counting unit, adecoder unit, an anti-interference threshold selection unit, an output control unit, and an oscillator unit. The device can automatically filter out the positive narrow pulse interference and the negative narrow pulse interference in the output pulse of the geomagnetic sensor; and the effect of filtering out the interference pulse can be adjusted by adjusting the upper limit amplitude of the amplitude limiting cumulative count value output by the reversible amplitude limiting counting unit or changing an upper limit comparison threshold and a lower limit comparison threshold of the anti-interference threshold selection unit.
Description
technical field [0001] The invention relates to the technical field of traffic state detection sensors, in particular to a vehicle counting pulse generating device based on geomagnetic sensing. Background technique [0002] The acquisition of traffic status is carried out through the information provided by the sensors arranged on the road, and the geomagnetic sensor has its unique advantages, such as not being affected by weather conditions, low cost, and easy to process data. However, due to different vehicle models, the magnetic field disturbances are different. The patent publication number CN 101923781 A mentions that since the geomagnetic sensor detects the change of the geomagnetism when the vehicle passes by, the distribution of the metal of the vehicle along the direction of travel of the vehicle is as follows: The length of the vehicle, the height of the chassis, and the structure of the engine will all affect the size of the geomagnetism. In addition, the vehicle ...
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IPC IPC(8): G08G1/042G08G1/065
CPCG08G1/042G08G1/065
Inventor 张晓虎凌云肖伸平陈刚曾红兵
Owner 蚌埠瑞众传感系统工程有限公司