Visibility detection device for road guidance system

Abstract

The utility model relates to the technical field of road driving, and discloses a visibility detection device for a road guidance system, which comprises a base station unit and a guidance lamp unit, a photometric circuit is arranged above the interior of the base station unit, a photoelectric receiving tube is fixedly connected to one side, close to the photometric circuit, of the interior of the base station unit, and the photoelectric receiving tube is connected with the guidance lamp unit. One side of the base station unit is provided with the induction lamp unit, and the induction lamp unit comprises a base, a solar cell panel, a support, a supporting strip, a pan-tilt camera, a control host, a wireless spread spectrum communicator, a base station frame body and a wireless communication module; the induction lamp unit and the base station unit work in a linkage mode, a light source with constant light intensity can be actively emitted, and a reference of a transmitting end is provided for camera detection. The fixed angle, fixed aperture, fixed gain and fixed exposure time of the camera determine the reference of the receiving end during detection; under various weather conditions and time periods, light source emission and camera reception are standard detected under the same reference.

Description

Technical Field

[0001] The utility model relates to the technical field of highway driving, in particular to a visibility detection device for a highway guidance system. Background Art

[0002] During operation, the foggy highway driving safety guidance device will show different guidance strategies according to the different air visibility. Under the condition of good air visibility, the system only switches between day and night (does not work during the day, and flashes yellow outline at night). When the air visibility is lower than a certain value, the system will guide driving safety through modes such as constant outline, flashing outline and anti-rear-end collision warning mode.

[0003] The traditional foggy highway driving safety induction device uses a visibility analyzer (also known as a visibility sensor and visibility monitor, etc.), which is commonly used by meteorological departments for air visibility analysis in various environments. The principle is: the visibility meter is composed of main components such as a light transmitter, a light receiver and a microprocessor controller. The transmitter emits infrared pulse light, and the receiver simultaneously detects the intensity of the pulse light forward scattered by aerosol particles in the atmosphere. All measurement information is collected by the microprocessor controller and converted into visibility in meteorological optics through a special mathematical model algorithm.

[0004] Disadvantages of traditional visibility analyzers:

[0005] If it is an unstable environment, especially the vibration of the roadbed of the highway, the vibration of the bridge and the various vibrations when heavy vehicles are driving, it will affect the monitoring accuracy of the optical visibility analyzer;

[0006] There are various dust and aerosol air pollution around highways and roads of all levels. If the transmitting and receiving lenses of the equipment are not cleaned regularly, the accuracy will be affected at best, and the function will be lost at worst.

[0007] When installing the optical visibility analyzer, it is necessary to consider that the transmitter and receiver should not face strong light sources (such as sunlight) or strong reflective surfaces (such as snow), and there should be no tall obstacles around. This limits the weather conditions and terrain conditions of use, such as the snowy areas and mountainous areas north of the Yellow River in winter. Utility Model Content

[0008] 1. Technical issues to be resolved

[0009] In view of the deficiencies in the prior art, the utility model provides a visibility detection device for a highway guidance system, which solves the problems raised in the above-mentioned background technology.

[0010] (II) Technical solution

[0011] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a visibility detection device of a highway guidance system, comprising a base station unit and an induction light unit, wherein a photometric circuit is installed on the upper part of the base station unit, a photoelectric receiving tube is fixedly connected to the inner side of the base station unit close to the photometric circuit, and the induction light unit is arranged on one side of the base station unit, wherein the induction light unit comprises a base, a solar cell panel, a bracket, a support bar, a pan-tilt camera, a control host, a wireless spread spectrum communicator, a base station frame and a wireless communication module, wherein the base is fixedly connected to the bottom end of the base station frame, the bracket is fixedly connected to the top end of the base station frame, the solar cell panel is fixedly connected to the upper part of the bracket, the control host is fixedly connected to the lower part of the base station frame, the wireless communication module is fixedly connected to the upper part of the base station frame close to the control host, the wireless spread spectrum communicator is fixedly connected to the upper part of the base station frame close to the wireless communication module, a support bar is fixedly connected to the upper part of one side of the base station frame, and a pan-tilt camera is fixedly connected to one end of the support bar.

[0012] Preferably, the photometric circuit uses the photoelectric receiving tube to measure the LED brightness value of the induction lamp unit and feeds it back to the current control to regulate the current and stabilize the LED brightness value. The photoelectric receiving tube refers to a photodiode.

[0013] Preferably, when the PTZ camera is in the detection state, the following four conditions must be met at the same time:

[0014] The gimbal position and lens zoom are fixed;

[0015] The PTZ camera is arranged relative to the light-emitting surface of the induction light unit;

[0016] The PTZ camera has a fixed aperture value, a fixed gain value, and a fixed exposure time;

[0017] The base station unit controls the light intensity of the induction light unit to be in a detection state.

[0018] Preferably, when the PTZ camera performs video analysis or image capture, the LED is kept on for a longer time than a complete exposure time of one frame of the camera and synchronization is required.

[0019] Preferably, the wireless communication module utilizes 4G communication or 5G communication.

[0020] (III) Beneficial effects

[0021] The utility model provides a visibility detection device for a highway guidance system, which has the following beneficial effects:

[0022] (1) The utility model utilizes the active light emission of the induction lamp unit of the foggy highway driving safety induction device as the detection target, and is no longer disturbed by the constantly changing environmental background.

[0023] (2) In the present invention, the induction light unit works in conjunction with the base station unit and can actively emit a light source with a constant light intensity, providing a benchmark for the transmitting end for camera detection; the fixed angle, fixed aperture, fixed gain and fixed exposure time of the camera determine the benchmark for the receiving end during detection; under various weather conditions and time periods, the light source emission and the camera reception are tested under the same benchmark;

[0024] (3) In the present invention, it is no longer affected by ambient light, vibration, terrain obstruction and changes. It can output qualitative data to the local linkage light induction strategy, and can also publish quantitative data and output it to the control platform to provide a basis for other indication systems. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the structure of the utility model;

[0026] Figure 2 The figure is a flow chart of the stable output light intensity of the induction lamp of the utility model.

[0027] In the figure: 100, base station unit; 200, induction light unit; 1, base; 2, photometric circuit; 3, photoelectric receiving tube; 4, solar panel; 5, bracket; 6, support bar; 7, pan-tilt camera; 8, control host; 9, wireless spread spectrum communicator; 10, base station frame; 11, wireless communication module. DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0029] like Figure 1-2As shown, the utility model provides a technical solution: a visibility detection device for a highway guidance system, comprising a base station unit 100 and a guidance light unit 200, a photometric circuit 2 is installed on the upper part of the base station unit 100, a photoelectric receiving tube 3 is fixedly connected to one side of the base station unit 100 close to the photometric circuit 2, a guidance light unit 200 is arranged on one side of the base station unit 100, and the guidance light unit 200 comprises a base 1, a solar cell panel 4, a bracket 5, a support bar 6, a pan-tilt camera 7, a control host 8, a wireless spread spectrum communicator 9, a base station frame 10 and a wireless communication Module 11, the bottom end of the base station frame 10 is fixedly connected to the base 1, the top of the base station frame 10 is fixedly connected to the bracket 5, the upper part of the bracket 5 is fixedly connected to the solar panel 4, the lower part of the base station frame 10 is fixedly connected to the control host 8, the upper part of the base station frame 10 is fixedly connected to the wireless communication module 11, the upper part of the base station frame 10 is fixedly connected to the wireless communication module 11, the upper part of the base station frame 10 is fixedly connected to the wireless spread spectrum communicator 9, the upper part of one side of the base station frame 10 is fixedly connected to the support bar 6, and one end of the support bar 6 is fixedly connected to the pan-tilt camera 7.

[0030] In this embodiment, the base station unit 100 mainly realizes automatic control / timing of the induction light unit 200 and communication forwarding between the central command and the induction light unit 200. During the detection process, the base station uses local communication to control the brightness and duration of the induction light unit 200, and links the omnidirectional pan-tilt camera 7 to perform visibility analysis and detection.

[0031] Visibility testing process:

[0032] 1. A photometric circuit 2 is set in the induction lamp unit 200, and the LED brightness value of the induction lamp unit 200 is measured by a photoelectric receiving tube 3, and fed back to the current control, by regulating the current and stabilizing the LED brightness value, such as Figure 2 As shown;

[0033] 2. When the omnidirectional PTZ camera is in the detection state, the following four conditions must be met at the same time:

[0034] Fixed angle (the pan / tilt position and lens zoom are fixed);

[0035] The camera faces the active light-emitting surface of the induction light unit 200 on the road surface;

[0036] The camera needs a fixed aperture value, fixed gain value, and fixed exposure time;

[0037] The base station controls the light intensity of the induction light to be in detection state.

[0038] 3. The camera performs video analysis or captures pictures. At this time, the LED should be on for a longer time than the complete exposure time of one frame of the camera and synchronization is required.

[0039] 4. The brightness value of the induction light captured in the obtained video frame or picture corresponds to the visibility value. Use the visibility measurement tool to calibrate the visibility value analyzed by the camera, obtain the correction coefficient, and you can get a visibility parameter that can meet the use of the induction light.

[0040] 5. Combining the light intensity detection of a single lamp with the light intensity detection of a group of lamps, when the threshold is set to A, when the light intensity threshold of one lamp is lower than A and the threshold of the adjacent lamp is higher than A, the meter-level visibility value can be obtained through trigonometric calculation. (The distance between the two lamps in the foggy highway driving safety guidance device is the standard 20 meters or 25 meters);

[0041] 6. If the omnidirectional PTZ is not in the detection position because the control center is used to observe the road conditions, etc., a special preset position needs to be set for the detection position during system construction. When visibility analysis is required, the special preset position can be called to return to the detection position;

[0042] 7. The detection method can be remote manual, timed start and seasonal high-frequency detection.

[0043] This method is specifically used for foggy highway driving safety induction devices. It enters the visibility detection state through the base station linkage active light-emitting induction lights, and the camera obtains images or pictures for analysis. Due to the specific camera parameter settings, factors such as terrain, vibration and ambient light will not affect the detection results, providing a stable and reliable technical method for correctly triggering the induction strategy of foggy highway driving safety induction devices.

[0044] Furthermore, the photometric circuit 2 uses a photoelectric receiving tube 3 to measure the LED brightness value of the induction lamp unit 200 and feeds it back to the current control to regulate the current and stabilize the LED brightness value. The photoelectric receiving tube 3 refers to a photodiode.

[0045] Furthermore, when the PTZ camera 7 is in the detection state, the following four conditions must be met at the same time:

[0046] The gimbal position and lens zoom are fixed;

[0047] The PTZ camera 7 is arranged relative to the light-emitting surface of the induction light unit 200;

[0048] The PTZ camera 7 needs a fixed aperture value, a fixed gain value, and a fixed exposure time;

[0049] The base station unit 100 controls the light intensity of the guide light unit 200 to be in a detection state.

[0050] Furthermore, when the PTZ camera 7 performs video analysis or image capture, the LED is lit for a time greater than the complete exposure time of one frame of the camera and synchronization is required.

[0051] Furthermore, the wireless communication module 11 utilizes 4G communication or 5G communication.

[0052] In summary, the workflow of the utility model is as follows: 1. A photometric circuit 2 is set in the induction lamp unit 200, and the LED brightness value of the induction lamp unit 200 is measured by a photoelectric receiving tube 3, and fed back to the current control, by regulating the current and stabilizing the LED brightness value, such as Figure 2 As shown;

[0053] 2. When the omnidirectional PTZ camera is in the detection state, the following four conditions must be met at the same time:

[0054] Fixed angle (the pan / tilt position and lens zoom are fixed);

[0055] The camera faces the active light-emitting surface of the induction light unit 200 on the road surface;

[0056] The camera needs a fixed aperture value, fixed gain value, and fixed exposure time;

[0057] The base station controls the light intensity of the induction light to be in detection state.

[0058] 3. The camera performs video analysis or captures pictures. At this time, the LED should be on for a longer time than the complete exposure time of one frame of the camera and synchronization is required.

[0059] 4. The brightness value of the induction light captured in the obtained video frame or picture corresponds to the visibility value. Use the visibility measurement tool to calibrate the visibility value analyzed by the camera, obtain the correction coefficient, and you can get a visibility parameter that can meet the use of the induction light.

[0060] 5. Combining the light intensity detection of a single lamp with the light intensity detection of a group of lamps, when the threshold is set to A, when the light intensity threshold of one lamp is lower than A and the threshold of the adjacent lamp is higher than A, the meter-level visibility value can be obtained through trigonometric calculation. (The distance between the two lamps in the foggy highway driving safety guidance device is the standard 20 meters or 25 meters);

[0061] 6. If the omnidirectional PTZ is not in the detection position because the control center is used to observe the road conditions, etc., a special preset position needs to be set for the detection position during system construction. When visibility analysis is required, the special preset position can be called to return to the detection position;

[0062] 7. The detection method can be remote manual, timed start and seasonal high-frequency detection.

[0063] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0064] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A visibility detection device for a highway guidance system, comprising a base station unit (100) and a guidance light unit (200), characterized in that: A photometric circuit (2) is installed on the upper part of the interior of the base station unit (100); a photoelectric receiving tube (3) is fixedly connected to a side of the interior of the base station unit (100) close to the photometric circuit (2); the induction light unit (200) is provided on one side of the base station unit (100); the induction light unit (200) comprises a base (1), a solar cell panel (4), a bracket (5), a support bar (6), a pan-tilt camera (7), a control host (8), a wireless spread spectrum communicator (9), a base station frame (10) and a wireless communication module (11); the base (1) is fixedly connected to the bottom end of the base station frame (10); the base station frame (200) is provided with a plurality of light guide elements (200); and the light guide elements (200) are provided with a plurality of light guide elements (200). The top of the base station frame (10) is fixedly connected to the bracket (5), the upper part of the bracket (5) is fixedly connected to the solar panel (4), the lower part of the interior of the base station frame (10) is fixedly connected to the control host (8), the upper part of the interior of the base station frame (10) near the control host (8) is fixedly connected to the wireless communication module (11), the upper part of the interior of the base station frame (10) near the wireless communication module (11) is fixedly connected to the wireless spread spectrum communicator (9), the upper part of one side of the base station frame (10) is fixedly connected to a support bar (6), and one end of the support bar (6) is fixedly connected to a pan / tilt camera (7).

2. A road guidance system visibility detection device according to claim 1, characterized in that: The photometric circuit (2) uses the photoelectric receiving tube (3) to measure the LED brightness value of the induction lamp unit (200) and feeds back to the current control to regulate the current and stabilize the LED brightness value. The photoelectric receiving tube (3) refers to a photodiode.

3. The visibility detection device for a road guidance system according to claim 1, characterized in that: When the pan / tilt camera (7) is in the detection state, the following four conditions must be met at the same time: The gimbal position and lens zoom are fixed; The pan / tilt camera (7) and the light-emitting surface on the induction light unit (200) are arranged relative to each other; The pan / tilt camera (7) has a fixed aperture value, a fixed gain value, and a fixed exposure time; The base station unit (100) controls the light intensity of the induction lamp unit (200) to be in a detection state.

4. The visibility detection device for a road guidance system according to claim 1, characterized in that: When the pan-tilt camera (7) performs video analysis or image capture, the LED is lit for a time greater than the complete exposure time of a frame of the camera and synchronization is required.

5. The visibility detection device for a road guidance system according to claim 1, characterized in that: The wireless communication module (11) utilizes 4G communication or 5G communication.

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