Device for automatically monitoring and counting traffic volume

Abstract

The invention provides a device for automatically monitoring and counting traffic volume. The device comprises an erection unit, a monitoring unit and a data processing unit, the erecting unit is fixed on one side of a road or stretches across the road and can be used for installing the monitoring unit; the monitoring unit comprises a millimeter wave radar, a laser radar, a camera and a geomagnetic sensor, and is used for receiving signals and transmitting the signals to the data processing unit; wherein the millimeter wave radar can track the speed and position of a vehicle in real time; the laser radar can scan the outline of the vehicle and judge the vehicle type; the camera can capture the number of axles and the trailer connection state; the geomagnetic sensor can obtain traffic flow and vehicle speed; and the data processing unit is used for processing the received signals. According to the device, the problem of shielding of ultrahigh vehicles can be solved, and the statistical accuracy of traffic volume is improved; and the trailer hinging state can be accurately identified, and data support is provided for traffic prediction guidance.

Description

Technical Field

[0001] The present invention relates to the technical field of traffic flow statistics, and in particular to a device for automatically monitoring and counting traffic volume. Background Art

[0002] The main purpose of highway traffic volume surveys is to collect data and provide a research basis for evaluating traffic capacity, planning and designing road networks, optimizing signal control, and dispatching public transportation. By automatically detecting traffic volume, the problems of low efficiency and large errors in traditional manual surveys can be solved.

[0003] Patent application number 201520108482.2 discloses a device for automatically monitoring and counting traffic volume. This device uses a combination of vehicle speed and time to determine vehicle length, and then combines this with weight to determine vehicle type. Traffic volume data is then generated based on the vehicle type and number. However, during vehicle operation, when small vehicles are close to oversized vehicles, they can easily obstruct traffic, leading to statistical deviations in traffic volume. Furthermore, the connection status of trailers cannot be monitored during vehicle operation, hindering traffic forecasting and guidance. Summary of the Invention

[0004] In light of this, the present invention provides a device for automatically monitoring and counting traffic volume, specifically comprising a mounting unit, a monitoring unit, and a data processing unit. This device can scan and photograph passing vehicles from the side. The combined effects of these two units can address the issue of obstruction caused by overheight vehicles, improving the accuracy of traffic volume statistics. It can also accurately identify the articulation status of trailers, providing data support for traffic forecasting and guidance.

[0005] The technical solutions of the present invention are as follows: A device for automatically monitoring and counting traffic volume, comprising a setting unit, a monitoring unit and a data processing unit; The mounting unit is fixed on one side of the road or across the road and can be used to install the monitoring unit; The monitoring unit includes a millimeter-wave radar, a laser radar, a camera, and a geomagnetic sensor, which are used to receive signals and transmit them to a data processing unit. The millimeter-wave radar can track the vehicle's speed and position in real time; the laser radar can scan the vehicle's outline to determine the vehicle type; the camera can capture the number of axles and trailer connection status; and the geomagnetic sensor can obtain traffic flow and speed. a data processing unit, for processing the received signal; When in use, the synergistic effect of cameras and lidar can effectively solve the problem of obstruction by super-high vehicles, thereby improving the accuracy of traffic volume statistics; and through camera monitoring, it can identify the connection status of trailers, facilitating traffic guidance.

[0006] Preferably, the erection unit comprises a gantry, which spans above the road; a mounting beam is provided on the vertical beam of the gantry, and one end of the mounting beam is slidably connected to the vertical beam; The mounting beam is located on one side of the road; The laser radar and camera are arranged on the mounting beam; A telescopic device A is provided at the bottom of the mounting beam, which can adjust the height of the mounting beam to meet the installation requirements of the laser radar and camera.

[0007] Preferably, a mounting plate is provided on the mounting beam, and the mounting plate is detachably connected to the mounting beam.

[0008] Preferably, the mounting plate is provided with a through hole, and a U-shaped connecting piece is used to span across both sides of the mounting beam and the two ends of the connecting piece are respectively passed through the through holes to connect the mounting plate and the mounting beam.

[0009] Preferably, a telescopic device B is provided on the mounting plate, one end of the telescopic device B is hinged to the mounting plate, and the other end is hinged to the camera; according to the camera area requirements of the camera, the angle of the camera is adjusted to improve the shooting accuracy, so that the articulation state of the trailer can be identified more accurately and the problem of obstruction by super-high vehicles can be solved.

[0010] Preferably, a bracket is provided on the mounting frame, the laser radar is installed on the bracket, and the laser radar is located above the camera; through the cooperation of the laser radar and the camera, the axle, model and articulation status of the vehicle can be identified, further improving the accuracy of traffic volume statistics.

[0011] Preferably, the millimeter wave radar is installed on the crossbeam of the gantry, and the number of millimeter wave radars matches the number of lanes; The geomagnetic sensor is buried below the surface of the road surface. When a vehicle passes by, it senses the geomagnetic changes caused by the vehicle and obtains the traffic volume and speed.

[0012] Preferably, the data processing unit is an edge AI computing box capable of processing the received signals.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. In the present invention, by arranging the laser radar and camera on the mounting beam, the laser radar and camera can scan and photograph passing vehicles from the side. With the synergistic effect of the two, the problem of obstruction by super-high vehicles can be solved, and the statistical accuracy of traffic volume can be improved. It can also accurately identify the articulation status of trailers and provide data support for traffic prediction and guidance.

[0014] 2. In the present invention, the telescopic device A is used to control the height of the mounting beam, so that the height of the laser radar and the camera can be controlled; the telescopic device B controls the angle of the camera to meet the shooting requirements of different lanes and improve the statistical accuracy of traffic volume.

[0015] 3. In the present invention, the use of an edge AI computing box can improve signal conversion efficiency and facilitate efficient and accurate data processing and analysis.

[0016] 4. The device provided by the present invention has the advantages of reasonable design and strong practicality; using this device can improve the accuracy of traffic volume statistics. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0018] Figure 1 It is a front schematic diagram of the device of the present invention.

[0019] Figure 2 This is an enlarged view of the M section.

[0020] Figure 3 It is a side schematic diagram of the device of the present invention.

[0021] Figure 4 This is an enlarged view of part N.

[0022] In the figure, 1-gantry, 2-mounting beam, 3-telescopic device A, 401-millimeter wave radar, 402-lidar, 403-camera, 404-geomagnetic sensor, 5-mounting plate, 6-connector, 7-telescopic device B, 8-bracket, 9-data processing unit, 1001-blowing pipe, 1002-nozzle, 1003-air guide plate, 11-air compressor. DETAILED DESCRIPTION

[0023] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the technical solutions of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0024] Example 1 Combine Figures 1-4, the present invention provides an automatic monitoring and statistical traffic volume device, including a setting unit, a monitoring unit and a data processing unit 9; Mounting unit, fixed to the side of the road or across the road, can be used to install monitoring units; In this embodiment, the erection unit includes a gantry 1, which spans above the road; a mounting beam 2 is provided on the vertical beam of the gantry 1, and one end of the mounting beam 2 is slidably connected to the vertical beam; The mounting beam 2 is located on one side of the road; Two telescopic devices A3 are provided at the bottom of the mounting beam 2, which can adjust the height of the mounting beam 2; The monitoring unit includes a millimeter-wave radar 401, a laser radar 402, a camera 403, and a geomagnetic sensor 404, and is used to receive signals and transmit them to the data processing unit 9. The millimeter-wave radar 401 can track the speed and position of the vehicle in real time; the laser radar 402 can scan the outline of the vehicle to determine the vehicle type; the camera 403 can capture the number of axles and the trailer connection status; and the geomagnetic sensor 404 can obtain the traffic volume and speed. The laser radar 402 and the camera 403 are arranged on the mounting beam 2; The telescopic device A3 adjusts the height of the mounting beam 2 to meet the installation requirements of the laser radar 402 and the camera 403; A mounting plate 5 is provided on the mounting beam 2, and the mounting plate 5 is detachably connected to the mounting beam 2; In this embodiment, the mounting plate 5 is provided with a through hole (not shown in the figure), in which a U-shaped connector 6 is installed; both ends of the U-shaped connector 6 are provided with threads; the U-shaped connector 6 is used to span both sides of the mounting beam 2, and the two ends of the connector 6 are respectively passed through the through holes and fixed to the two ends of the U-shaped connector 6 with nuts, thereby connecting the mounting plate 5 and the mounting beam 2; A telescopic device B7 is provided on the mounting plate 5. One end of the telescopic device B7 is hinged to the mounting plate 5, and the other end is hinged to the camera 403. The angle of the camera 403 is adjusted according to the camera area requirements of the camera 403 to improve the shooting accuracy, thereby being able to more accurately identify the articulated state of the trailer and solve the problem of being blocked by an over-height vehicle. A bracket 8 is provided on the mounting frame, and a laser radar 402 is mounted on the bracket 8. The laser radar 402 is located above the camera 403. Through the cooperation of the laser radar 402 and the camera 403, the axle, model and articulation status of the vehicle can be identified, thereby further improving the accuracy of traffic volume statistics. Three laser radars 402 are provided, each with a wavelength of 905 nm and an installation height of 4.5 m. The angles between the three laser radars 402 and the horizontal and vertical planes are 60° and 25°, 45° and 25°, and 30° and 25°, respectively. This arrangement allows the laser radars 402 to be installed on the mounting beam 2 at an angle of 25°. This 25° installation angle allows the laser radars 402 to penetrate rain and fog at an optimal angle to capture the entire vehicle outline, effectively reducing the probability of obstruction by overly tall vehicles and improving the accuracy of traffic statistics. It also reduces the impact of streetlights on the laser radars 402. Three binocular cameras 403 are installed at a height of 4.2 m to avoid mutual interference. The angles between the three cameras 403 and the horizontal and vertical planes are 60° and 45°, 45° and 45°, and 30° and 45°, respectively. This arrangement allows the cameras 403 to be installed on the mounting beam 2 at an angle of 45°, capturing the license plate, axle, and trailer articulation. The 45° angle allows for intuitive capture of vehicle side elevation features, such as the number of tire axles and trailer articulation, and reduces license plate mirror reflections, improving recognition rates and addressing critical information that cannot be captured from a vertical perspective. By utilizing the synergistic effect of the laser radar 402 and the camera 403, a 3D trajectory of the vehicle can be integrated, which helps to solve the problem of vehicle obstruction and improve the accuracy of traffic volume statistics. It can also accurately identify the articulation status of the trailer, providing data support for traffic prediction and guidance. Three millimeter-wave radars 401 are installed on the crossbeam of gantry 1 at a height of 6.5 meters from the ground. Each lane has one radar, and the centerline of the radar beam coincides with the centerline of the lane, covering the lane vertically downward. The radar transmit beam has a downward tilt angle of 10 degrees. The geomagnetic sensor 404 is buried below the road surface. When a vehicle passes by, it senses the geomagnetic changes caused by the vehicle and obtains the traffic volume and speed. The data processing unit 9 processes the received signal; In this embodiment, the data processing unit 9 is an edge AI computing box, model NVIDIA Jetson AGX Orin, which is capable of processing the received signals; When in use, the synergistic effect of camera 403 and lidar 402 can effectively solve the problem of obstruction by super-high vehicles, thereby improving the accuracy of traffic volume statistics; and through monitoring by camera 403, the trailer connection status can be identified, which is convenient for providing traffic guidance.

[0025] Example 2 Combine Figure 2 and Figure 4 In order to prevent rain and snow from generating water droplets on the surface of the camera 403 and affecting the shooting of the camera 403, a purge component is provided on the inner side of the shielding shell of the camera, and the purge component is connected to the air compressor 11; The purge assembly includes a blowing pipe 1001, the blowing pipe 1001 is connected to a long strip nozzle 1002, and the nozzle 1002 is installed with an arc-shaped air guide plate 1003; The bottom end of the air guide plate 1003 is higher than the shooting window of the camera 403; the air guide plate 1003 protrudes toward the shooting window; The wind guide plate 1003 is an elastic plate, and there are gaps between the two side surfaces of the wind guide plate 1003 and the two side surfaces of the camera 403 shielding shell; when the wind enters the blowing pipe 1001, the long strip nozzle 1002 sprays gas to blow the shooting window of the camera 403. Under the action of the wind guide plate 1003, the blowing wind force increases. With the movement of the wind, the water droplets falling on the shooting window can be quickly blown off, allowing the camera 403 to continue shooting with high precision.

[0026] Although the present invention has been described in detail with reference to preferred embodiments, the present invention is not limited thereto. Without departing from the spirit and essence of the present invention, a person of ordinary skill in the art may make various equivalent modifications or substitutions to the embodiments of the present invention, and such modifications or substitutions shall be within the scope of the present invention. Any person skilled in the art who can easily conceive of changes or substitutions within the technical scope disclosed in the present invention shall be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the scope of protection of the claims.

Claims

1. A device for automatically monitoring and counting traffic volume, characterized in that: It includes installation unit, monitoring unit and data processing unit; The mounting unit is fixed on one side of the road or across the road and can be used to install the monitoring unit; The monitoring unit includes a millimeter-wave radar, a laser radar, a camera, and a geomagnetic sensor, which are used to receive signals and transmit them to a data processing unit. The millimeter-wave radar can track the vehicle's speed and position in real time; the laser radar can scan the vehicle's outline to determine the vehicle type; the camera can capture the number of axles and trailer connection status; and the geomagnetic sensor can obtain traffic flow and speed. The data processing unit processes the received signal.

2. The device for automatically monitoring and counting traffic volume according to claim 1, characterized in that: The erection unit includes a gantry, which spans above the road; a mounting beam is provided on the vertical beam of the gantry, and one end of the mounting beam is slidably connected to the vertical beam; The mounting beam is located on one side of the road; The laser radar and camera are arranged on the mounting beam; A telescopic device A is provided at the bottom of the mounting beam.

3. The device for automatically monitoring and counting traffic volume according to claim 2, characterized in that: A mounting plate is provided on the mounting beam, and the mounting plate is detachably connected to the mounting beam.

4. The device for automatically monitoring and counting traffic volume according to claim 3, characterized in that: The mounting plate is provided with a through hole, and a U-shaped connecting piece is used to span both sides of the mounting beam and connect the mounting plate and the mounting beam after the two ends of the connecting piece pass through the through hole respectively.

5. The device for automatically monitoring and counting traffic volume according to claim 4, characterized in that: A telescopic device B is provided on the mounting plate, one end of the telescopic device B is hinged to the mounting plate, and the other end is hinged to the camera.

6. The device for automatically monitoring and counting traffic volume according to claim 1, characterized in that: A bracket is provided on the mounting frame, and the laser radar is installed on the bracket. The laser radar is located above the camera.

7. The device for automatically monitoring and counting traffic volume according to claim 2, characterized in that: The millimeter-wave radar is installed on the crossbeam of the gantry, and the number of millimeter-wave radars matches the number of lanes; The geomagnetic sensor is buried below the surface of the road surface. When a vehicle passes by, it senses the geomagnetic changes caused by the vehicle and obtains the traffic volume and speed.

8. The device for automatically monitoring and counting traffic volume according to claim 1, characterized in that: The data processing unit is an edge AI computing box.

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