KR20190006373A - Vehicle notification system for preventing traffic accident - Google Patents

Abstract

According to an embodiment of the present invention, a vehicle notification system for preventing a traffic accident includes: a sensor unit detecting a moving object and outputting information on the moving object; and a control unit estimating a speed of the moving object by using the outputted information of the sensor unit and deciding whether the moving object is a vehicle by using the outputted information of the sensor unit and the estimated speed of the moving object. The control unit is able to control a notifying unit formed to notify information on existence of a vehicle and a speed of the vehicle in accordance with a kind of the moving object and the speed of the moving object.

Description

[0001] The present invention relates to a vehicle notification system for preventing a traffic accident,

The present invention relates to a vehicle notification system for preventing traffic accidents, and more particularly, to a vehicle notification system for preventing traffic accidents at an intersection of a back road.

Conventionally, there are a loop coil system and a headlight detection system to provide a notification of a vehicle approaching an intersection at a road intersection.

The loop coil method utilizes the principle that the magnetic field changes due to electromagnetic induction when a metal automobile passes over a current-carrying coil, and it has an advantage that it can detect an approaching vehicle regardless of day or night. However, there is a problem that the cost is low, the maintenance is frequently required, and the construction cost is high and maintenance is difficult because the road must be cut at the time of construction.

The headlight detection method is a method in which a light sensor senses the headlight of a vehicle. However, it can not be used during the day when the headlights are not turned on. Since it is a method of detecting light, there is a possibility of misinterpretation by a light source such as a vehicle stopped at a headlamp or a surrounding light. These products can be installed only on the road surface, which is a position where the change of the magnetic field due to the passage of the vehicle or the light of the headlight can be detected, and the disadvantage is that only the existence of the approach vehicle can be grasped and the speed can not be grasped.

Conventionally, a method of outputting a simple light or a warning sound in a manner of notifying the intersection approach of the vehicle has been used. However, this has a problem in that it can not inform the approach direction of the vehicle and the speed of the vehicle.

Korean Patent No. 10-1553143

SUMMARY OF THE INVENTION Accordingly, the present invention has been made in view of the circumstances described above, and it is an object of the present invention to provide a method and apparatus for detecting a vehicle approaching intersection, The present invention provides a vehicle notification system for preventing traffic accidents that can reduce the occurrence of traffic accidents by notifying the driver or pedestrian of the vehicle.

According to an aspect of the present invention, there is provided a vehicle alert system for traffic accident prevention, comprising: a sensor unit for detecting a moving object and outputting information on the moving object; And a control unit for estimating a speed of the moving object using the output information of the sensor unit and determining whether the vehicle is a moving object by using the output information of the sensor unit and the estimated speed of the moving object, The control unit may control the notification unit provided to notify the presence of the vehicle and the vehicle speed information according to the type and speed of the moving object.

The sensor unit may be a microwave motion sensor that senses an object to be moved using a microwave.

The output information of the sensor unit may include the frequency and the amplitude of the microwave reflection signal reflected from the moving object.

The control unit may include a speed estimating unit that estimates a speed of the moving object using the frequency of the microwave reflection signal; A vehicle classifying unit for determining whether the vehicle is to be moved using the velocity of the moving object estimated by the velocity estimating unit and the amplitude of the microwave reflection signal; And a notification control unit for controlling the notification unit to determine whether a notification is necessary for the moving object using the type and speed of the moving object and to notify one of the vehicle low speed access or the vehicle high speed access when it is determined that the notification is necessary can do.

The vehicle classifying unit may classify the moving object as a vehicle when the velocity of the moving object is equal to or higher than a predetermined first reference velocity and the amplitude of the microwave reflection signal is equal to or greater than a preset reference amplitude.

The notification control unit may determine that a notification is required when the moving object is a vehicle, and may generate a vehicle low speed access signal and transmit the vehicle low speed access signal to the notification unit.

The notification unit may output an optical signal according to the vehicle low-speed access signal.

The optical signal may be embodied as at least one or more symbols among a symbol '>>>>', a symbol '<<<<' or a plurality of symbols 'v' arranged vertically so as to inform the direction of approach of the vehicle .

When the moving object is approaching at an intersection in two or more directions, the notification unit may display at least two or more of the '>>>>' symbol, the '<<<<' symbol, or the plurality of 'v' The optical signal implemented by the symbol can be alternately output.

The notification control unit may generate a vehicle high-speed access signal and transmit the signal to the notification unit when the speed of the moving object exceeds a predetermined second reference speed.

The notification unit may output a red flashing optical signal according to the vehicle rapid access signal.

The sensor unit and the notification unit may be installed on a non-signal intersection formed by a plurality of roads.

The sensor unit may include a plurality of microwave motion sensors, and each of the microwave motion sensors may be disposed to face different roads from a plurality of roads forming the non-signal intersection.

The notification unit may include a plurality of notification devices, and each of the notification devices may be disposed to face different roads from a plurality of roads forming the non-signal intersection.

Therefore, according to the vehicle notification system for traffic accident prevention according to the embodiment of the present invention, it is possible to estimate whether or not the vehicle is a moving object approaching an intersection of a back road, and if the moving object is a vehicle, It is possible to prevent a traffic accident by preventing a collision between a vehicle approaching an intersection and a pedestrian or a collision between vehicles by informing the outside of the vehicle whether or not the vehicle is approaching at a high speed so that a pedestrian on the intersection or another vehicle driver recognizes it .

In addition, in the case of the loop coil method and the headlight detection method, the sensor can be installed only on the road surface, whereas the microwave motion sensor of the present invention is freely installed. It is possible to reduce the installation and maintenance cost since the construction such as road cutting and burial is not required in the maintenance process, and it is cheaper than the conventional technology and the price competitiveness is increased.

In addition, in the case of road construction, it is highly possible that the entire road is inevitably blocked. However, since the application range of the present invention is a back road of less than a certain width, the traffic flow is not disturbed during installation and maintenance.

In addition, there is a possibility that the headlight detection system of the related art may cause unnecessary operation by a light source such as a vehicle or a surrounding vehicle that is stopped with the headlight turned on, but the microwave motion sensor of the present invention has a significant effect It operates regardless of the headlights of the vehicle, so it can detect approach vehicles regardless of day or night.

1 is a block diagram of a vehicle alert system for traffic accident prevention according to an embodiment of the present invention.
2 is a circuit diagram of a vehicle alert system for traffic accident prevention according to an embodiment of the present invention.
3 is a use state diagram of a vehicle alert system for traffic accident prevention according to an embodiment of the present invention.
4 is a view showing a vehicle access signal of a vehicle alert system for traffic accident prevention according to an embodiment of the present invention.
5 is a first flowchart of a vehicle notification method for traffic accident prevention according to an embodiment of the present invention.
6 is a second flowchart of a vehicle notification method for traffic accident prevention according to an embodiment of the present invention.
7 is a third flowchart of a vehicle notification method for traffic accident prevention according to an embodiment of the present invention.
FIG. 8 is a first graph showing a frequency variation amount of a microwave reflection signal.
9 is a second graph showing the frequency variation of the microwave reflection signal.
FIG. 10 is a first screen of a digital oscilloscope showing a frequency variation amount of a microwave reflection signal.
11 is a second screen of a digital oscilloscope showing a frequency variation amount of a microwave reflection signal.

In order to fully understand the present invention, operational advantages of the present invention, and objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the accompanying drawings which illustrate preferred embodiments of the present invention.

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly explain the present invention, parts not related to the description are omitted, and the same reference numerals in the drawings indicate the same members.

Throughout the specification, when an element is referred to as &quot; including &quot; an element, it does not exclude other elements unless specifically stated to the contrary.

Referring to FIG. 1, a vehicle alert system 10 for preventing a traffic accident according to an embodiment of the present invention is installed on a non-signal intersection of a back road to detect an approach approach to a moving object, A control unit 200, and a notification unit 300. The sensor unit 100, the control unit 200, the notification unit 300, the control unit 200, and the notification unit 300 are the same as those shown in FIG. ), And the like.

A vehicle alert system 10 for traffic accident prevention according to an embodiment of the present invention senses a moving object (vehicle) to which the sensor unit 100 approaches by an intersection and outputs information on a moving object, Estimates the speed of the moving object by using the output information of the sensor unit 100 and determines whether the moving object is the moving object by using the output information of the sensor unit 100 and the speed of the moving object, It is possible to control the notification unit 300 provided to notify the existence of the vehicle and the vehicle speed information to the outside according to the type and the speed.

Accordingly, the vehicle notification system 10 for preventing traffic accidents according to the embodiment of the present invention notifies the outside of the vehicle information about approaching the intersection of the back road, so that the pedestrian or other vehicle driver on the intersection can recognize it, A collision between the approaching vehicle and the passenger or a collision between the vehicles can be prevented in advance to prevent a traffic accident.

Hereinafter, the configuration of a vehicle alert system 10 for traffic accident prevention according to an embodiment of the present invention will be described in detail with reference to FIG. 1 and FIG.

The sensor unit 100 may be a microwave motion sensor for detecting an object to be moved by using a microwave. The sensor unit 100 may be fixedly installed on an intersection where four roads intersect on a back road by a separate support. The sensor unit 100 is not limited to the above-described example, but may be mounted on an intersection where a plurality of roads intersect.

The sensor unit 100 may include four microwave motion sensors 110, 120, 130 and 140. Each of the microwave motion sensors 110, 120, 130 and 140 may be arranged to face different ones of the four roads forming the intersection on the intersection. Each of the microwave motion sensors 110, 120, 130, and 140 may emit a microwave transmission signal toward a road facing the microwave motion sensor. Here, a microwave refers to an electromagnetic wave having a very high frequency. When microwave is irradiated, the microwave is reflected by an object and then reflected by an object. However, when reflected from an object, it is influenced by the reflectance of the object. .

That is, when the reflectance of the object is high, the amplitude of the microwave is kept substantially, and when the reflectance of the object is low, the amplitude of the microwave is low. The amplitude characteristics of the microwaves can be used for classifying objects, which will be described later.

On the other hand, when the microwave is reflected and returned by the moving object, the frequency of the microwave changes. Here, the frequency varies depending on the speed of the object to be moved. When the speed of the object to be moved is relatively fast, the amount of frequency variation is large. When the object to be moved is relatively slow, the frequency variation is small. This frequency characteristic is used to estimate the velocity of the moving object, which will be described later.

Each of the microwave motion sensors 110, 120, 130, and 140 may detect a moving object using a microwave and output information on the detected moving object. The output information output from each of the microwave motion sensors 110, 120, 130, and 140 is output from each of the microwave motion sensors 110, 120, 130, and 14, Includes the amplitude and frequency of the microwave reflected signal. Each of the microwave motion sensors 110, 120, 130, and 140 may transmit the amplitude and frequency of the microwave reflection signal to the controller 200.

Referring to FIG. 2, the vehicle notification system 10 for preventing a traffic accident according to an embodiment of the present invention may further include an amplification unit. The amplification unit amplifies the signal size of the output information of the sensor unit 100 to a level that can be analyzed by the control unit 200. The amplification unit includes a first amplifier 1, a second amplifier 2, a third amplifier 3, And a fourth amplifier (Amplifier 4). Each of the first amplifier, the second amplifier, the third amplifier and the fourth amplifier may be provided between the sensor unit 100 and the controller 200 .

Each of the first, second, third, and fourth amplifiers (Amplifiers 1, 2, 3, and 4) may amplify the signal size of output information output from each of the motion sensors 110, 120, 130, and 140. The output information of the sensor unit 100 amplified by the amplification unit may be transmitted to the control unit 200. FIG.

The control unit 200 can calculate the type and speed of the moving object approaching the intersection using the output information of the sensor unit 100. [ In addition, the control unit 200 can control the notification unit 300 according to the calculated type and speed of the moving object to inform the outside of the vehicle information that the vehicle approaches the intersection. For this, the controller 200 may include a speed estimator 210, a vehicle classifier 220, and an alert controller 230.

The speed estimating unit 210 may estimate the speed of the moving object sensed by the sensor unit 100. [ The velocity estimation unit 210 may receive the frequency of the microwave reflection signal from the sensor unit 100 with respect to the moving object. The velocity estimation unit 210 can estimate the velocity of the moving object using the frequency of the microwave reflection signal transmitted.

The velocity estimation unit 210 can estimate the velocity of the moving object using the Doppler effect. Here, the Doppler effect is an effect that occurs when at least one of a wave source generating a wave and an observer observing the wave is moving. When the distance between the source and the observer is narrowed, the frequency of the wave increases, And the frequency of the wave is decreased when the wave is vibrated.

Hereinafter, the velocity estimation of the moving object using the Doppler effect of the microwave will be described in detail.

First, the microwave transmission signal T (t) emitted from the sensor unit 100 is expressed by Equation (1).

&Quot; (1) &quot;

In Equation (1), f is frequency and t is time. When the microwave transmission signal T (t) is reflected and then returned after being incident on the moving object at the velocity v, the frequency is changed by the Doppler effect. Here, the frequency change amount f 'is expressed by Equation (2).

&Quot; (2) &quot;

In Equation (2), c is the luminous flux,? Is the incident angle, v is the velocity of the moving object, and f is the frequency. Further, the velocity v of the moving object has a (+) sign when the moving object approaches the sensor unit 100.

That is, when the moving object approaches the sensor unit 100, since the frequency variation amount f 'is a positive number, the frequency of the microwave reflection signal increases. When the moving object moves away from the sensor unit 100, the frequency variation amount f' The frequency of the signal decreases.

The microwave reflection signal R (t) received by the sensor unit 100 is expressed by Equation (3) according to the Doppler effect.

&Quot; (3) &quot;

In the equation (3), f is a frequency, f 'is a frequency variation, t is a time, d is a distance between the sensor unit 100 and a moving object, and c is a light flux. Also, when the moving object is distant from the sensor unit 100 by a distance d, the time taken for the microwave reflection signal to travel between the sensor unit 100 and the moving object is 2d / c. In addition, the frequency of the microwave reflection signal is f + f '.

The microwave reflection signal R (t) is added to the LO (Local Oscillator) signal which is the same as the microwave transmission signal T (t) by the mixer. The signal obtained by combining the two signals is shown in Equation (4).

&Quot; (4) &quot;

In Equation (4), f is a frequency, f 'is a frequency variation, t is a time, d is an interval between the sensor unit 100 and a moving object, and c is a light flux.

인

와 주파수가

인

의 곱으로 이루어진다. 수학식2에서 일반적으로 v<<c 이므로, f'<<f이다. 따라서 이 신호를 로우패스필터(Low-pass filter)에 동과시키면 주파수가

인 신호만 통과하게 된다. 로우패스필터를 통과한 신호를 V(t)라고 할 때 V(t)는 수학식5와 같다.As shown in Equation (4), the signal obtained by combining the microwave reflection signal R (t) and the LO signal has a frequency

sign

And frequency

sign

. In Equation (2), since it is generally v << c, f '<< f. Therefore, when this signal is synchronized to a low-pass filter,

Only signal. And a signal passed through the low-pass filter is V (t), V (t) is expressed by Equation (5).

Equation (5)

In Equation (5), f is a frequency, f 'is a frequency variation, t is a time, d is a distance between the sensor unit 100 and a moving object, and c is a light flux.

This V (t) is the final output signal of the sensor unit 100 and the output information of the sensor unit 100 received at the control unit 200. [

Then, the speed estimation unit 210 of the control unit 200 can know the frequency variation amount f 'by measuring the frequency of V (t) through spectral analysis and can measure the speed v of the moving object based on Equation (2) have. Here, the speed estimation unit 210 may be configured to include a spectrum analyzer and / or an oscilloscope.

On the other hand, if the sensor unit 100 emits a microwave transmission signal in a pulsed manner, the velocity estimation unit 210 can measure the distance d between the moving object and the sensor unit 100 through the pulse round trip time.

The vehicle classifying unit 220 can classify the type of the moving object sensed by the sensor unit 100. The vehicle classifying unit 220 receives the amplitude of the microwave reflection signal from the sensor unit 100 and outputs the amplitude of the microwave reflection signal to the speed estimating unit 210, Lt; / RTI &gt; The vehicle classifying unit 220 can classify the type of the object to be moved using the velocity of the object to be moved and the amplitude of the microwave reflection signal.

Hereinafter, a description will be made of a method for establishing a criterion for classifying a type of a moving object.

First, if the speed of the moving object sensed by the sensor unit 100 is fast, the moving object is more likely to be a vehicle than a pedestrian. However, in order to clearly understand whether the detected moving object is a vehicle, it is necessary to know the size of the moving object and the reflectance of the moving object. If the vehicle is running slowly or the person is running fast, it is impossible to distinguish the vehicle from the person by the speed alone.

The larger the magnitude of the moving object and the higher the reflectance of the moving object, the more the microwave is reflected. Therefore, the amplitude of the microwave reflection signal received by the sensor unit 100 becomes larger.

Since the vehicle is large in size and has a high microwave reflectivity due to a metal material, when the moving object to be accessed is a vehicle, the amplitude of the microwave reflection signal received by the sensor unit 100 becomes larger than when the vehicle approaches. However, the parameters for determining the amplitude of the received microwave reflection signal include not only the size and reflectance of the moving object but also the distance between the moving object and the sensor unit 100, the radiation angle of the sensor unit 100, There is an intensity of the transmitted signal. The amplitude of the microwave reflection signal received by the sensor unit 100 becomes smaller as the distance becomes longer, the radiation angle of the sensor unit 100 becomes larger, and the intensity of the microwave transmission signal becomes lower. Therefore, in order to grasp the type of the object, the amplitude of the received microwave reflection signal must be corrected in consideration of the distance to be moved, the radiation angle of the sensor unit 100, and the intensity of the microwave transmission signal.

As described above, when the sensor unit 100 outputs a microwave transmission signal in a pulse-like manner, the distance to be moved can be measured through the round trip time of the pulse. The radiation angle of the sensor unit 100 and the intensity of the microwave transmission signal depend on how the microwave motion sensor is designed.

In order to correct this part, it is necessary to measure how the amplitude of the microwave reflection signal received when the vehicle and the person are actually approaching changes. After manufacturing a microwave motion sensor, the vehicle is placed at a distance d from the microwave motion sensor, and the amplitude of the microwave reflection signal received by the microwave motion sensor is measured while changing the distance d. The same experiment is repeated for humans. When the magnitude of the reflected microwave signal is measured according to the type and distance of the moving object, the measured value becomes a reference amplitude for discriminating whether the moving object approaching the microwave motion sensor is a vehicle or a person.

Therefore, when the vehicle notification system for traffic accident prevention according to the embodiment of the present invention detects the moving object approaching in the actual road environment, the distance of the moving object and the amplitude of the received microwave reflection signal are measured, It is possible to determine whether the moving object is a vehicle or a person.

For example, the vehicle classifying unit 220 may compare the amplitude of the microwave reflection signal with a predetermined reference amplitude, and determine the amplitude of the reflected microwave signal. Here, the reference amplitude can be set appropriately by referring to experimental result values for vehicles such as motorcycles and automobiles, and experimental results for non-vehicles such as people, bicycles, and the like. When the amplitude of the microwave reflection signal is equal to or greater than the reference amplitude, the vehicle classifying unit 220 can classify the moving object as a vehicle such as a motorcycle or an automobile. When the amplitude of the microwave reflection signal is less than the reference amplitude, the vehicle classifying unit 220 can classify the moving object as being not a vehicle such as a bicycle or a person.

On the other hand, the vehicle classifying unit 220 can classify the type of the moving object by further considering the speed of the moving object estimated by the speed estimating unit 210. [ That is, when the amplitude of the microwave reflection signal is equal to or greater than the reference amplitude and the velocity of the moving object is equal to or greater than the first reference velocity, the vehicle classifying unit 220 can finally classify the moving object as a vehicle. This helps to reduce errors in vehicle classifications. The first reference speed may be set appropriately according to the road environment.

The alert controller 230 can receive the type and speed of the moving object from the vehicle classifier 220. [ The notification control unit 230 can determine whether or not the notification of the moving object is needed using the type and speed of the moving object.

For example, the notification control unit 230 can determine that it is necessary to inform the approach of the vehicle in the intersection when the type of the moving object transmitted from the vehicle classifying unit 220 is a vehicle. At this time, the notification control unit 230 may generate a vehicle low speed access signal and transmit it to the notification unit 300. Here, the vehicle low speed access signal is a control signal for controlling the vehicle low speed access notification operation of the notification unit 300.

When the type of the moving object transmitted from the vehicle classifying unit 220 is the vehicle and the speed of the moving object exceeds the second reference speed, the notification control unit 230 determines that it is necessary to inform the high-speed access of the vehicle . Here, the second reference speed may be set appropriately according to the road environment, and it is obvious that the second reference speed is faster than the first reference speed.

At this time, the notification control unit 230 may generate a vehicle high-speed access signal and transmit the signal to the notification unit 300. Here, the vehicle high-speed access signal is a control signal for controlling the notification unit 300 to notify the vehicle fast-approaching operation.

In this manner, the notification control unit 230 can control the notification unit 300 to inform at least one of the vehicle low-speed access or the vehicle high-speed access when it is determined that the external notification of the moving object is necessary. On the other hand, if it is determined that the external notification about the moving object is not necessary, the notification controller 230 continuously determines whether or not the moving object needs to be notified.

The notification unit 300 may be a kind of optical signal output device that is provided to notify vehicle information such as vehicle low-speed access or high-speed vehicle access to the outside. The notification unit 300 may preferably be an LED device having high light efficiency. The notification unit 300 includes a first notification device 310, a second notification device 320, a third notification device 330, and a third notification device 330 arranged to face different roads among four roads forming an intersection on an intersection. 4 notification device 340, and the like.

Each of the notification units 300 can inform the outside of the vehicle information related to vehicle approach in the intersection under the control of the controller 200. [

The notification unit 300 may output an optical signal to be viewed from the outside in accordance with the vehicle low speed access signal when the vehicle speed low access signal is received from the control unit 200. [ Here, it is preferable that the optical signal of the notification unit 300 is a signal of a color with good visibility so that it can be viewed by an in-pedestrian or other vehicle driver. For example, the optical signal output in accordance with the vehicle slow access may be green.

Also, the notification unit 300 can output an optical signal to inform the vehicle fast approach. At this time, it is preferable that the optical signal output from the notification unit 300 is a different color from the optical signal related to vehicle access in the intersection. For example, if the optical signal for vehicle approach is green, the optical signal for fast access to the vehicle is preferably red.

On the other hand, the notification unit 300 can warn the driver of the vehicle being fast-approaching that the vehicle is in high-speed access. For this, the notification unit 300 may include a separate transceiver unit. The notification unit 300 may alert the vehicle driver that the vehicle is approaching the vehicle at a high speed according to the vehicle high speed access signal of the controller 200. [ Here, the rapid access warning of the notification unit 300 can be delivered to the driver of the high-speed access vehicle in the form of voice, image, image, etc. in the vehicle. The driver of the high-speed access vehicle recognizes that the vehicle is in high-speed access when receiving the high-speed access warning, so that the speed of the vehicle can be reduced and the vehicle accident caused by the high-speed access can be prevented.

Referring to FIG. 3, it can be seen that the vehicle alert system 10 for preventing traffic accidents according to the embodiment of the present invention is installed on a non-signal intersection. That is, the sensor unit 100, the control unit 200, and the notification unit 300 may be positioned on the intersection by a separate support. Each of the sensor units 110, 120, 130, and 140 and the notification units 310, 320, 330, and 340 may be disposed to face different ones of the four roads forming the intersection on the intersection.

For example, when two vehicles 20, 30 approach the intersection, the notification unit 300 facing the first vehicle 20 is a vehicle 30 approaching the intersection at the reference left side road of the first vehicle 20, To the first vehicle 20, the access information to the first vehicle 20. The notification unit 300 facing the second vehicle 30 can also inform the second vehicle 20 of the approach information of the vehicle 20 approaching into the intersection at the reference right road of the second vehicle 20. [ At this time, the access information is outputted as an optical signal so as to inform the approach direction of the vehicle, which will be described later with reference to FIG.

Referring to FIG. 4, the optical signal may be expressed by any one of symbols '>>>>', '<<<<', and 'v' Can be implemented.

In FIG. 4 (a), the symbol ">>>>" is a symbol indicating that there is a vehicle approaching the intersection on the left road. Here, the notifying unit 300 may output the optical signal of the symbol ">>>> 'finally so that the optical signal of the symbol"> "is sequentially turned on in the right direction. Also, the notification unit 300 may turn off the optical signal of the symbol ">>>>" after being turned on, and then sequentially turn on the optical signal of the symbol ">" in the right direction again from the beginning.

 In FIG. 4 (b), the symbol << <<< 'is a symbol indicating that there is a vehicle approaching the intersection on the right road. Here, the annunciator 300 can sequentially output the optical signal of '<<<<' symbol by lighting the optical signal of the symbol '<' sequentially in the left direction. Also, the notification unit 300 may turn off the light signal after the '<<<<' symbol is turned on, and then turn on the light signal of the symbol '<' again in the left direction sequentially from the beginning.

In FIG. 4 (c), a plurality of 'v' symbols arranged up and down are symbols indicating that there is a vehicle approaching from an opposite road to an intersection. Here, the annunciator 300 may output a plurality of 'v' symbols of the optical signals of the 'v' symbol so that the optical signals of the symbols 'v' are sequentially turned on in the downward direction. In addition, the notification unit 300 may turn off the optical signal having the symbol 'v' and turn on the optical signal having the symbol 'v' sequentially in the downward direction.

On the other hand, when the moving object (vehicle) approaches at an intersection at the same time in two or more directions, the notification unit 300 displays the '>>>>' symbol, the '<<<<' symbol, quot; v &quot; symbol, which is implemented by at least two or more symbols.

In (d) of FIG. 4, when the vehicle is approaching at a high speed, the notification unit 300 may illuminate the entire notification panel in red instead of a symbol indicating the approach direction of the vehicle. Here, the lighting color is not limited to red, and can be appropriately changed as needed. The driver of the vehicle recognizes that the vehicle is in a high-speed accessing operation by seeing the red light signal of the notification unit 300 and performs deceleration of the vehicle.

 Therefore, the vehicle notification system for traffic accident prevention according to the embodiment of the present invention can discriminate whether the vehicle is a moving object approaching to a non-signal intersection of a back road, and when the moving object is a vehicle, Since the vehicle driver or the pedestrian on the back road can be informed of the approach, the driver or the pedestrian can know in advance, and the traffic accident can be prevented.

Hereinafter, a vehicle notification method for traffic accident prevention according to an embodiment of the present invention will be described with reference to FIG.

The vehicle notification method for traffic accident prevention according to the embodiment of the present invention may include a moving object detection step S410, a moving object velocity estimation step S420, a moving object classification step S430, and a vehicle information notification step S440 . &Lt; / RTI &gt;

First, in the moving object sensing step S410, the sensor unit 100 senses the moving object and transmits information on the moving object to the controller 200. [ Here, the sensor unit 100 emits a microwave transmission signal toward a plurality of roads connected to an intersection. When the object to be moved is on the road, the microwave transmission signal is reflected by the object to be moved and returns to the sensor unit 100. The sensor unit 100 receives the microwave reflection signal reflected from the moving object. The sensor unit 100 transmits the output information including the frequency and the amplitude of the microwave reflection signal to the control unit 200.

Then, in the moving object velocity estimation step S420, the control unit 200 estimates the moving object velocity using the frequency of the microwave reflection signal. Since the velocity estimation of the moving object has been described with reference to Figs. 1 and 2, detailed description thereof will be omitted.

Then, in the moving object classification step S430, the controller 200 classifies the moving object type using the amplitude of the microwave reflection signal and the velocity of the moving object.

Hereinafter, the moving object classification step S430 will be described in detail with reference to FIG.

The controller 200 compares the estimated moving speed with the first reference speed in step S430 (S431). Here, the first reference speed is appropriately set according to the road environment.

If the velocity of the object to be moved is equal to or greater than the first reference velocity, the controller 200 compares the amplitude of the microwave reflection signal with the reference amplitude (S433). Here, the reference amplitude can be appropriately set with reference to the experimental result value for the motorcycle, the automobile, etc., and the experimental result value for the non-vehicle such as the bicycle and the person.

If the amplitude of the microwave reflection signal is equal to or greater than the reference amplitude, the control unit 200 classifies the moving object as a vehicle (S435).

If the velocity of the moving object is less than the first reference velocity in step S431 and the amplitude of the microwave reflection signal is less than the reference amplitude in step S433, the controller 200 classifies the moving object as being not a vehicle (S437).

Then, in step S440, the control unit 200 controls the notification unit 300 according to the type and speed of the moving object to inform the outside of the vehicle information.

Hereinafter, the vehicle information notification step S440 will be described in detail with reference to FIG.

In step S430, the control unit 200 determines whether the vehicle is classified as a moving object. Here, if the object to be moved is not a vehicle, the process returns to step S410, and the sensor unit 100 continuously detects the object to be moved.

If it is determined in step S441 that the moving object is a vehicle, the control unit 200 compares the moving object speed with the second reference speed (S443). Here, the second reference speed may be set appropriately according to the road environment.

If the speed of the moving object is equal to or higher than the second reference speed, the controller 200 determines that the vehicle is in the fast access mode and controls the notification unit 300 to output a fast access notification signal (S445). Here, the fast access notification signal may be a red optical signal, but is not limited thereto and can be expressed in various ways.

On the other hand, if the speed of the moving object is less than the second reference speed, the control unit 200 determines that the vehicle is approaching and controls the notification unit 300 to output the vehicle low speed approach notification signal (S447). Here, the vehicle low-speed approach notification signal may be represented by any one of symbols '<<<<', '<<<<', or 'v' .

Therefore, the vehicle notification method for traffic accident prevention according to the embodiment of the present invention can discriminate whether the vehicle is a moving object approaching to a non-signal intersection of a back road, and when the moving object is a vehicle, Since the vehicle driver or the pedestrian on the back road can be informed of the approach, the driver or the pedestrian can know in advance, and the traffic accident can be prevented.

Referring to FIGS. 8 to 11, experimental results showing that the frequency of the microwave reflection signal varies depending on whether the vehicle is moving or not can be confirmed.

The graphs of FIGS. 8 and 9 show the frequency variation of the microwave reflection signal using an oscilloscope. In the graph of Fig. 8, the vehicle is in a non-moving state for approximately 1 to 9 ms. At this time, the frequency of the microwave reflection signal output from the sensor unit 100 is 54.8 Hz on average and the standard deviation is 21.8 Hz.

In the case of approximately 10 to 35 ms, the vehicle is approaching into the intersection. At this time, the frequency of the microwave reflection signal output from the sensor unit 100 is 99.5 Hz on average and the standard deviation is 72.0 Hz.

 In the graph of Fig. 8, the test results are t = -2.8152, df = 32.803, p-value: 0.004091. Where p-value is the probability that the frequency of the microwave reflection signal when the vehicle approaches is less than or equal to the frequency of the microwave reflection signal when the vehicle is not approaching.

In the graph of Fig. 9, the vehicle is in a non-moving state for approximately 1 to 4 ms. At this time, the frequency of the microwave reflection signal output from the sensor unit 100 is 51.1 Hz on average and the standard deviation is 13.1 Hz.

In the case of approximately 5 to 20 ms, the vehicle is approaching into the intersection. At this time, the frequency of the microwave reflection signal output from the sensor unit 100 is 117.1Hz on average and the standard deviation is 77.3Hz.

 In the graph of FIG. 9, as a result of the test, t = -3.2314, df = 17.492, and p-value: 0.004091.

Based on the graphs of FIGS. 8 and 9, it can be seen that the average frequency of the microwave reflection signal when the vehicle is not moving is lower than the average frequency of the microwave reflection signal when the vehicle is moving. That is, in the vehicle notification system for traffic accident prevention according to the embodiment of the present invention, the speed of the vehicle can be estimated using the frequency of the microwave reflection signal. Also, the results shown in the graphs of FIGS. 8 and 9 demonstrate that the p-value is close to 0, which is valuable as an experimental result.

Referring to FIGS. 10 and 11, the frequency variation of the microwave reflection signal using the digital oscilloscope can be confirmed.

11 shows the frequency variation of the microwave reflection signal when the metallic object (vehicle) moves slowly relative to the metallic object in Fig. 11, Fig. 11 shows the frequency variation amount of the microwave reflection signal when the metallic object It shows the amount of frequency change. That is, it can be confirmed that the frequency of the microwave reflection signal in FIG. 10 is lower than the frequency of the microwave reflection signal in FIG.

The method according to the present invention can be implemented as a computer-readable code on a computer-readable recording medium. A computer-readable recording medium includes all kinds of recording apparatuses in which data that can be read by a computer system is stored. Examples of the recording medium include a ROM, a RAM, a CD-ROM, a magnetic tape, a floppy disk, an optical data storage device, and the like, and a carrier wave (for example, transmission via the Internet). The computer-readable recording medium may also be distributed over a networked computer system so that computer readable code can be stored and executed in a distributed manner.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is evident that many alternatives, modifications and variations will be apparent to those skilled in the art.

Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

10: Vehicle notification system for traffic accident prevention
100:
110, 120, 130, 140: first, second, third, and fourth microwave motion sensors
200:
210:
220:
230:
300:
310, 320, 330, 340: first, second, third, and fourth notification devices
Amplifier 1, 2, 3, 4: first, second, third, and fourth amplifiers

Claims (14)

A sensor unit for sensing a moving object and outputting information about the moving object; And
And a control unit for estimating the speed of the moving object using the output information of the sensor unit and determining whether the moving object is the moving object by using the output information of the sensor unit and the estimated speed of the moving object,
Wherein the control unit controls a notification unit provided to notify the presence of the vehicle and the vehicle speed information according to the type and the speed of the moving object. The method according to claim 1,
Wherein the sensor unit is a microwave motion sensor for sensing a moving object using a microwave. 3. The method of claim 2,
Wherein the output information of the sensor unit includes frequency and amplitude of a microwave reflection signal reflected from the moving object. The method of claim 3,
Wherein,
A velocity estimator for estimating a velocity of the moving object using the frequency of the microwave reflection signal;
A vehicle classifying unit for determining whether the vehicle is to be moved using the velocity of the moving object estimated by the velocity estimating unit and the amplitude of the microwave reflection signal; And
An alert control unit for determining whether or not an alert is required for the moving object by using the type and speed of the moving object and for controlling the alert unit to inform one of the vehicle low speed approach or the vehicle high speed approach when it is determined that the alert is necessary;
And a vehicle alert system for preventing traffic accidents. 5. The method of claim 4,
Wherein the vehicle classifying unit comprises:
When the velocity of the moving object is not less than a predetermined first reference velocity and the amplitude of the microwave reflection signal is not less than a preset reference amplitude, A vehicle alert system for traffic accident prevention characterized by classifying the vehicle as a vehicle. 6. The method of claim 5,
The notification control unit,
Wherein the control unit determines that a notification is required when the moving object is a vehicle, and generates a vehicle low speed access signal and transmits the generated vehicle low speed access signal to the notification unit. The method according to claim 6,
Wherein,
And outputs an optical signal according to the vehicle low speed access signal. 8. The method of claim 7,
Wherein:
Wherein the symbol is embodied as at least one or more symbols of a symbol '>>>>', a symbol '<<<<' or a plurality of symbols 'v' arranged vertically so as to inform the direction of approach of the vehicle Vehicle notification system for. 9. The method of claim 8,
Wherein,
When the moving object approaches at an intersection in two or more directions, it is implemented with at least two symbols among the symbols '>>>>', '<<<<', and 'v' And the optical signal is outputted alternately. The method according to claim 6,
The notification control unit,
And generates a vehicle rapid access signal and transmits the signal to the notification unit when the speed of the moving object exceeds a predetermined second reference speed. 11. The method of claim 10,
Wherein,
And outputs a red flashing light signal in accordance with the vehicle high-speed access signal. The method according to claim 1,
Wherein the sensor unit and the notification unit are installed on a non-signal intersection formed by a plurality of roads. 13. The method of claim 12,
Wherein the sensor unit includes a plurality of microwave motion sensors,
Wherein each of the microwave motion sensors is disposed to face different roads among a plurality of roads forming the non-signal intersection. 13. The method of claim 12,
Wherein the notification unit includes a plurality of notification devices,
Wherein each of the notification devices is disposed to face different roads from among a plurality of roads forming the non-signal intersection.

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