Measuring method with circular coils

A measurement method and loop coil technology, applied in the direction of using devices, instruments, traffic control systems, etc. that measure the time required to move a certain distance, which can solve the problems of speed deviation from actual speed and inconsistency of vehicle detection.

Active Publication Date: 2009-09-09
SHANGHAI BAOKANG ELECTRONICS CONTROL ENG
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  • Abstract
  • Description
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Problems solved by technology

[0004] The present invention provides a loop coil measurement method to solve the defect that the existing loop coil detectio

Method used

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  • Measuring method with circular coils
  • Measuring method with circular coils

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Embodiment Construction

[0019] The three-coil detection method of the present invention will be described in detail below in conjunction with a specific embodiment, as figure 2 as shown,

[0020] First, let the vehicle pass through the first coil, the second coil and the third coil in turn, and record the time values ​​when passing through each coil respectively, denoted as t1, t2, t3;

[0021] Secondly, measure the distance S1 between the first coil and the second coil, the distance S2 between the first coil and the third coil, and the distance S3 between the second coil and the third coil;

[0022] Third, use the formula V=S / T to obtain three vehicle speeds, namely V1=S1 / (t2-t1), V2=S2 / (t3-t2), V3=S3 / (t3-t1), where S is the distance between the two coils, T is the time difference from entering the first coil to entering the second coil, and V is the speed of the vehicle;

[0023] Fourth, filter the speed value. If one of the differences between V1 and V2, between V1 and V3, and between V2 and V3...

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Abstract

The invention relates to measuring method with circular coils, which comprises the following steps: allowing a vehicle to pass through n coils and recording time values when the vehicle passes through each coil; measuring the distance between each two coils respectively; solving speeds by a formula V=S/T respectively, wherein S is the distance between each two coils, T is the time difference between the vehicle passing through a first coil and a second coil, and V is the speed of the vehicle; and screening speed values to determine whether the difference value between two speeds is always less than 20 percent, if one of the difference value is more than 20 percent, filtering the speed or displaying that the speed is not detected; and if the difference value is always less than 20 percent,performing weighted average on the obtained speeds so as to obtain the final speed. The measuring method can obtain the actual speed of the vehicle as much as possible.

Description

technical field [0001] The invention relates to a speed measurement method, in particular to a loop coil measurement method. Background technique [0002] The vehicle detection system is a very important part of the road monitoring system. Using induction coils to detect vehicle speed (including motor vehicles and non-motor vehicles) is a relatively mature vehicle detection method in the world at present. It can obtain the current monitoring road traffic flow, occupancy Speed, speed and other data, in order to judge road congestion, and use the field information release system to issue warnings, etc., especially in the measurement of vehicle speed plays an important role. The basic principle is to bury a group of induction coils (two) in the road subgrade section of the same lane, and each group of induction coils is connected with a multi-channel vehicle detector. When the vehicle passes through the two coils, the passing state of the vehicle will be detected due to the ch...

Claims

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Application Information

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IPC IPC(8): G01P3/66G08G1/052G08G1/042
Inventor 王海恩曾凯蒋松涛
Owner SHANGHAI BAOKANG ELECTRONICS CONTROL ENG
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