KR102330612B1 - Prediction apparatus of black ice and blow up in road surface - Google Patents

Abstract

The present invention relates to a device for predicting the occurrence of black ice and blow-up on a road surface. The purpose of the present invention is to accurately predict black ice that occurs on a road surface in winter and a blow-up phenomenon that occurs during a heat wave, and inform the black ice or the blow-up phenomenon to a driver. The device for predicting the occurrence of black ice and blow-up comprises: a thermal imaging camera (20) provided on a vertical column (10) on one side of a road to measure the temperature of the surface of the road; a temperature/humidity sensor (30) provided at the vertical column (10); a control unit for predicting the occurrence of black ice and blow-up on the basis of the temperature of the road surface measured by the thermal imaging camera (20) and the atmospheric temperature and humidity measured by the temperature/humidity sensor (30), and reporting a prediction result to a traffic center situation room; and a road situation monitoring server provided in the traffic center situation room.

Description

A device for predicting occurrence of black ice and blow-up on the road surface {PREDICTION APPARATUS OF BLACK ICE AND BLOW UP IN ROAD SURFACE}

The present invention relates to an apparatus for predicting the occurrence of black ice and blow-up on a road surface, and more particularly, to black ice and blow-up on a road surface using a thermal imaging camera and an atmospheric temperature and humidity sensor ) predicts the occurrence of black ice and informs the driver, and at the same time automatically sprays salt water on the road surface when black ice occurs to prevent accidents caused by poor road surface conditions. It's about the device.

BACKGROUND ART [0002] Poor road surface conditions such as freezing of roads due to rain or snow, occurrence of black ice, occurrence of potholes, and occurrence of blow-ups are one of the main causes of traffic accidents.

Accordingly, various technologies for detecting or predicting road surface conditions have been proposed.

The technology for detecting the road surface condition can be divided into a vibration method, a laser scanning method, an image camera method, and the like.

In the vibration method, an acceleration sensor is attached to a vehicle and a pattern of a vibration signal generated when the vehicle passes through a road surface area is analyzed to detect a road surface failure.

The above-described vibration method has the advantage of being easy to install because the sensor is attached to the vehicle, but has a disadvantage in that it is difficult to accurately detect the road condition when similar vibration data such as a pothole or a manhole are generated.

In addition, in order to detect a road surface condition, a vehicle must pass through a road surface defect point, and in general, vehicle drivers tend to avoid the road surface condition area.

Therefore, in the vibration method, it is difficult to accurately detect a defect in the road surface.

The laser scanning method is a method of extracting information by scanning a road surface using a laser scanner.

The laser scanning method can accurately determine the road surface condition, but has a disadvantage in that the equipment is expensive. Therefore, there is a limit that it is difficult to spread widely.

The video camera method detects a road surface defect by analyzing an image input from a small camera such as a vehicle black box.

The camera method has the advantage of being cheaper than the laser scanning method, but has a disadvantage in that the accuracy is low because the texture of the road image changes according to the change of weather.

1 shows a Road Weather Information System (RWIS) that is currently installed and operated on highways in Korea.

In the road weather information system, observation equipment is installed on the roadside, and a temperature sensor and a humidity sensor are embedded in the road surface.

The sensors collect road weather information and transmit it to the base station, which transmits the data to the traffic center through a wired/wireless communication network.

Then, the traffic center provides information on the road surface condition of the road to the driver through an electric signboard or the like.

On the other hand, in winter, when the temperature drops below zero, roads are often frozen due to snow or rain.

The icing of the road is a major cause of traffic accidents in winter, and when a traffic accident occurs due to the freezing of the road, time and economic loss occur due to delay of the vehicle and traffic control, as well as damage to human life.

Therefore, it is necessary to prevent traffic accidents in advance by predicting road icing in advance and notifying the driver.

Various technologies for detecting the icing state of the road have been proposed. Korean Patent Registration No. 1158404 uses an electrode terminal installed on the road to measure the air temperature and the actual temperature of the road, and then provides an ice prediction and Provides freezing conditions.

Although the above-mentioned conventional technique has an advantage of being able to accurately measure the actual temperature of the road, it has a disadvantage that it cannot accurately measure the road surface temperature on a road on which a temperature measuring device is not provided.

FIG. 2 shows the installation state of the road ice prevention device of Korean Patent Registration No. 10-0494877, and FIG. 3 shows the state when the vehicle passes the road ice detection device.

The conventional road surface icing detection device 100 shown in FIGS. 2 and 3 has an open receiving space of a predetermined size therein, and a detection sensor receptor 120 installed in a direction perpendicular to the vehicle traveling direction; The detection sensor module 110, which is provided in the receiving space of the detection sensor receptor, and generates a detection signal by sensing a pressurized load from the outside, and a protective member installed at a predetermined distance from the upper portion of the detection sensor and protecting the detection sensor module (130) is formed.

In the road surface icing detection device 100 having the above structure, when the vehicle travels to the upper surface of the detection sensor receptor 120 in a state in which snow or foreign substances 140 are accumulated on the top surface of the detection sensor receptor 120, FIG. As shown in 3, the load of the tire 150 of the driving vehicle is transmitted to the protection member 130, and the load transmitted to the protection member 130 is transmitted to the detection sensor module 110 to determine whether the road surface is frozen.

However, the road ice detection device 100 as shown in FIGS. 2 and 3 has a disadvantage in that it is difficult to detect when a vehicle having a large tire 150, such as a large truck or a trailer, runs.

In addition, in an area where the speed limit is high, such as a highway, when the tire 150 of the vehicle passes the opening of the detection sensor receiving part, the vehicle may shake and an accident may occur.

The possibility of such an accident increases as the size of the tire 150 is smaller for a small vehicle.

In addition, there is a inconvenience of periodically removing substances such as soil or leaves accumulated in the opening of the sensor receiving unit.

In winter, traffic accidents due to the black ice phenomenon, in which thin ice on the road surface freezes, occur frequently.

The black ice is a phenomenon that occurs when snow that has once melted is frozen again, and soot and dust are agglomerated with the snow, resulting in a black color.

Accordingly, the color of the ice is similar to the color of the asphalt on the road, making it difficult for the driver to see it with the naked eye.

That is, it is easy for a driver to mistake the black ice for a slightly wet state rather than an icy road.

This can lead to a serious accident while driving without slowing down.

The black ice mainly occurs in areas with a low road surface temperature, such as a shady road or a tunnel, and may also occur at dawn when the temperature drops overnight.

However, it is pointed out that it is difficult to accurately predict the occurrence of such black ice in conventional road surface sensing systems.

Also, recently, a blow-up phenomenon in which a road suddenly rises due to a heat wave occurs frequently. Conventional road surface sensing systems have a problem in that it is difficult to accurately predict such a blow-up phenomenon.

Korean Patent Registration No. 0494877 (2005. 6. 14. Announcement) Korean Patent Registration No. 1331054 (Notice on Nov. 19, 2013) Korean Patent Registration No. 1715211 (2017. 3. 6. Announced) Korean Patent Registration No. 2185737 (2020. 12. 2. Announcement)

An object of the present invention is to solve the problems of the prior art, and it is an object of the present invention to accurately predict a black ice phenomenon occurring on a road surface in winter.

Another object of the present invention is to automatically operate a salt spray device when black ice occurs on a road surface.

Another object of the present invention is to accurately predict a blow-up phenomenon in which a road suddenly rises during a heat wave in summer.

Another object of the present invention is to prevent a traffic accident by predicting black ice and blow-up phenomena in advance and informing the driver.

In order to achieve the above object, an apparatus for predicting occurrence of black ice and blow-up according to the present invention is an apparatus for predicting occurrence of black ice and blow-up on a road surface, from -20 ° C to 120 ° C. A thermal imaging camera having a measurement range of °C and provided on a vertical column on one side of the road to measure the temperature of the road surface, a temperature and humidity sensor having a measurement range of -80 °C to 60 °C and provided on the vertical column; A control unit that predicts the occurrence of black ice and blow-up based on the road surface temperature measured by the thermal imaging camera and the atmospheric temperature and humidity measured by the temperature and humidity sensor and transmits it to the traffic center situation room; a road condition monitoring server provided in the situation room, wherein the control unit generates black ice When the temperature of the road surface measured by the thermal imaging camera is 0℃ ~ -1.9℃, it is a stage of interest, if it is -2℃ to -3.9℃, it is a caution stage, and if it is below -4℃, it is a warning trigger an event in the step, When the dew point temperature is 0℃ or less and the road surface temperature measured by the thermal imaging camera satisfies all the conditions below the dew point, the automatic salt water spraying device installed on the road is operated, The controller determines that blow-up occurs when the atmospheric temperature is 30 ° C or higher and the heat index (HI) is 32 ° C or higher for 2 days or more, When the temperature of the road surface measured by the thermal imaging camera is 30℃ ~ 34.9℃, the event of interest, 35℃ ~ 39.9℃, caution stage, and if it is 40℃ or higher, the event of warning stage is generated. And at the caution or warning stage of the blow-up, a signal is transmitted to the traffic center situation room, and the traffic center situation room displays the road condition in text on a variable message sign (VMS) installed on the road, It is characterized by predicting both the occurrence of black ice and the occurrence of blow-up in the equipment.

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According to the present invention, there is an effect of accurately predicting the black ice phenomenon that occurs on the road surface in the winter season and guiding it to the driver by using the thermal imaging camera and the temperature/humidity sensor.

In addition, when black ice is generated on the road surface, the salt spray device is automatically operated, so that the black ice is quickly removed.

In addition, it has the effect of accurately predicting the blow-up phenomenon in which the road suddenly rises during the heat wave in summer.

In addition, it has the effect of ensuring the safety of road vehicles and maintaining smooth traffic flow.

In addition, there is an effect of enabling efficient snow removal by utilizing temperature data during snow removal.

In addition, there is an effect that the accumulated data by season and period can be utilized as big data related to road safety.

1 is a view briefly showing a road weather information system according to the prior art.
2 is a view showing an example of a road surface ice detection device according to the prior art.
Figure 3 is a view for explaining the operation method of Figure 2;
4 is an overall configuration diagram of a road surface condition prediction system according to the present invention.
5 is a view for explaining the operation of the road surface condition prediction system according to the present invention.
6 is a view showing a process of detecting a road surface temperature by a thermal imaging camera according to the present invention.
7 is a flowchart illustrating a process of predicting occurrence of black ice according to the present invention.
8 is a flowchart illustrating a process for predicting the occurrence of blow-up according to the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

<Black ice and blow-up occurrence prediction device>

As shown in FIGS. 4 and 5 , the apparatus for predicting occurrence of black ice and blow-up on a road surface according to the present invention is provided on a vertical column 10 on one side of the road to prevent the occurrence of black ice on the road surface. A thermal imaging camera 20 for measuring a temperature, a temperature/humidity sensor 30 provided in the vertical column 10, and the temperature of the road surface measured by the thermal imaging camera 20, It is configured to include a control unit that predicts the occurrence of black ice and blow-up by the atmospheric temperature and humidity measured by the humidity sensor 30 and transmits it to the traffic center situation room, and a road condition monitoring server provided in the traffic center situation room. .

The thermal imaging camera 20, it is preferable to use a camera having a measurement range of -20 ℃ ~ 120 ℃.

And the temperature and humidity sensor 30, it is preferable to use a sensor having a measurement range of -80 ℃ ~ 60 ℃.

Here, the controller determines that black ice occurs when all conditions of a dew point temperature of 0° C. or less and a road surface temperature measured by the thermal imaging camera 20 being less than or equal to the dew point are satisfied. do.

The dew point is a temperature at which water vapor in the atmosphere is saturated and the water vapor condenses into water, and is measured by a dew point thermometer.

The dew point thermometer may include a cooling device for condensing water vapor to form dew, and a device for measuring a temperature at which dew is formed.

In addition, the dew point can be calculated by the Magnus formula using temperature and relative humidity.

On the other hand, according to the paper on the prediction of freezing in the bridge section, it was found that the road surface freezes when the dew point temperature is below 0℃ and the road surface temperature is below the dew point.

Therefore, when all of the above conditions are satisfied, it can be estimated that black ice is generated on the road surface.

In addition, the control unit, when the temperature of the road surface measured by the thermal imaging camera 20 is 0°C to -1.9°C, the interest stage, -2°C to -3.9°C, the caution stage, and -4°C or less generates a warning-level event.

In addition, the control unit transmits a signal to the traffic center situation room at the time of the caution or warning stage, and the traffic center situation room displays the road condition in text on a road electric sign installed on the road.

Accordingly, the driver can be made aware that black ice has occurred on the road surface.

And the controller operates the automatic salt spraying device installed on the road when the dew point temperature is 0° C. or less and the road surface temperature measured by the thermal imaging camera 20 is less than or equal to the dew point conditions are satisfied. .

With the automatic salt spraying device, it is possible to quickly remove black ice generated on the road.

And the control unit, when the atmospheric temperature is 30 ℃ or higher and the heat index is 32 ℃ or higher for 2 days or more, it is determined that blow-up occurs.

The heat index (HI: Heat Index) quantifies the degree to which a person actually feels hot in consideration of temperature and humidity.

That is, the heat index is an index combining temperature and relative humidity in a shaded area, and is also called sensible temperature.

The heat index increases rapidly when the humidity increases even under the same temperature condition. For example, when the temperature is 32°C and the relative humidity is 75%, the heat index becomes 42°C.

The heat index can be obtained by the calculation method of 'Rinke sensible temperature'.

In addition, the control unit is a stage of interest when the temperature of the road surface measured by the thermal imaging camera 20 is 30°C to 34.9°C, a caution stage when it is 35°C to 39.9°C, and a warning stage when it is 40°C or higher. raise an event.

And, at the time of the caution step or the warning step, a signal is transmitted to the traffic center situation room, and the traffic center situation room displays the condition of the road in text on a road electric sign installed on the road.

This allows the driver to recognize that a blow-up has occurred on the road.

<Method for predicting occurrence of black ice>

As shown in FIG. 7 , the method for predicting occurrence of black ice according to the present invention includes (a) measuring the temperature of the road surface by the thermal imaging camera 20 (S11), (b) on Measuring the temperature and humidity of the atmosphere by the humidity sensor 30 (S12), (c) calculating the dew point (S13), (d) determining whether the dew point is 0 ° C or less (S14), (e) determining whether the temperature of the road surface is below the dew point (S15), (f) determining whether the temperature of the road surface is below -2°C (S16), (g) the steps S14, 15, and 16 When all of the conditions of are satisfied, the steps of automatically operating the automatic salt spraying device (S17), (h) displaying the occurrence of black ice on the electric road sign board (S18) are included.

In step S11 , as shown in FIG. 6 , the temperature of about 10 individual points is measured by one thermal imaging camera 20 .

And in step S13, the dew point may be measured using a dew point thermometer or may be obtained by a dew point calculation formula using temperature and humidity.

<Blow-up occurrence prediction method>

As shown in FIG. 8, the method for predicting the occurrence of blow-up according to the present invention includes (i) measuring the temperature of the road surface by the thermal imaging camera 20 (S21), (j) on Measuring the temperature and humidity of the air by the humidity sensor 30 (S22), (k) determining whether the air temperature is 30°C or higher (S23), (l) determining whether the heat index is 32°C or higher Steps (S24), (m) determining whether the atmospheric temperature is 30°C or higher and the heat index is 32°C or higher for 2 days or more (S25), (n) Determines whether the road surface temperature is 35°C or higher Steps (S26), (o) when all of the conditions of steps S23, S24, S25, and S26 are satisfied, and a step (S18) of displaying the occurrence of blow-up on the road electric sign.

Recently, the number of traffic accidents caused by black ice on the road surface is increasing.

The black ice is black, and unlike rain or snow, it is difficult for a driver to see it with the naked eye, and it is difficult to identify it with a general camera.

Accordingly, when the driver drives without decelerating without knowing the frozen state of the road, the risk of a traffic accident increases.

In particular, when black ice occurs on a highway, it can lead to a major traffic accident in which a large number of vehicles collide.

According to the present invention, it is possible to accurately predict the occurrence of black ice in the winter season by the road surface temperature measured by the thermal imaging camera 20 and the atmospheric temperature and humidity detected by the temperature and humidity sensor.

In particular, it is possible to accurately predict whether or not black ice will occur based on the dew point and the road surface temperature, so that the driver can recognize it.

In addition, in the case of a heat wave in summer, it is possible to accurately predict whether or not blow-up will occur based on the air temperature and heat index, and recognize it to the driver.

Accordingly, it is possible to reduce the occurrence of traffic accidents caused by black ice or blow-up.

In the above, preferred embodiments of the present invention have been exemplarily described, and the scope of the present invention is not limited to the specific embodiments described above. Those of ordinary skill in the art to which the present invention pertains will understand that various modifications and changes are possible without departing from the scope of the technical spirit of the present invention.

10: vertical column
20: thermal imaging camera
30: temperature and humidity sensor

Claims (10)

In an apparatus for predicting the occurrence of black ice and blow-up on a road surface,
A thermal imaging camera 20 having a measuring range of -20 ° C to 120 ° C and provided on a vertical column 10 on one side of the road to measure the temperature of the road surface;
A temperature/humidity sensor 30 having a measuring range of -80 ° C. to 60 ° C. and provided in the vertical column 10;
By predicting the occurrence of black ice and blow-up by the temperature of the road surface measured by the thermal imaging camera 20 and the atmospheric temperature and humidity measured by the temperature and humidity sensor 30, it is reported to the traffic center situation room. a control unit that transmits
Including a road condition monitoring server provided in the traffic center situation room,
The control unit is
It is determined that black ice occurs when the dew point temperature is 0° C. or less and the road surface temperature measured by the thermal imaging camera 20 satisfies the dew point or less conditions,
When the road surface temperature measured by the thermal imaging camera 20 is 0℃ ~ -1.9℃, it is a stage of interest, if it is -2℃ to -3.9℃, it is a caution stage, and if it is -4℃ or less, it is a warning stage event to generate,
When the dew point temperature is 0° C. or less and the road surface temperature measured by the thermal imaging camera 20 satisfies the dew point or less conditions, the automatic salt spray device installed on the road is operated,
The control unit is
It is judged that blow-up occurs when the atmospheric temperature is 30 ° C or higher and the heat index (HI: Heat Index) is 32 ° C or higher for 2 days or more,
When the temperature of the road surface measured by the thermal imaging camera 20 is 30°C to 34.9°C, it generates an event of interest, 35°C to 39.9°C, a caution phase, and a warning stage when it is 40°C or higher,
In the caution or warning phase of the black ice and blow-up, a signal is transmitted to the traffic center situation room,
The traffic center situation room displays the road condition in text on a variable message sign (VMS) installed on the road,
A device for predicting the occurrence of black ice and blow-up on a road surface, characterized in that it predicts both the occurrence of black ice and the occurrence of blow-up in one device. delete delete delete delete delete delete delete delete delete

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