KR101348316B1 - Traffic signal failure detection method - Google Patents

Abstract

The present invention relates to a method for detecting an abnormal status of a traffic signal using a signal operation step stable. The method for detecting an abnormal status of a traffic signal of the present invention comprises the steps of (a) writing a signal operation step table by receiving, from a traffic signal controller, a light-on frequency of a traffic signal light and time information on each display in the corresponding light-on frequency; (b) setting a reference current value according to the type of the traffic signal light and the light-on number by each display of the signal operation step table so that a maximum value and a minimum value can be set in the predetermined magnification of the reference current value; (c) detecting a current value applied to the traffic signal light by the traffic signal controller; (d) synchronizing the detected current detection value with the time information for each display of the signal operation step table; (e) applying the synchronized current detection value to the signal operation step table to determine whether the current detection value is located between less than the maximum value and greater than the minimum value by each display; (f) if the current detection value is more than the maximum value, determining the corresponding light-on frequency and display as a current leakage and generating an alarm signal; and (g) if the current detection value is less than the minimum value, determining the corresponding light-on frequency and display as an absence of the traffic signal and generating an alarm signal. As such, the present invention writes the signal operation step table, synchronizes the current detection value with the time information by each step and classifies the abnormal status of the traffic signal into the current leakage and the absence of the traffic signal, thereby accurately identifying the abnormal status of the traffic signal to quickly and actively respond to the abnormal status. [Reference numerals] (AA) Start; (BB) End; (ST100) Write a signal operation step table; (ST110) Set a reference current value by each display; (ST120) Detect a present current value; (ST130) Synchronize a current detection value by step; (ST140) Maximum value > Current detection value > Minimum value; (ST150) Current detection value >= Maximum value?; (ST160) Determine as the corresponding step current leakage; (ST170) Current detection value <= Minimum value?; (ST180) Determine as the corresponding step traffic signal absence; (ST190) Generate an alarm including abnormal status

Description

Traffic signal abnormality detection method {TRAFFIC SIGNAL FAILURE DETECTION METHOD}

The present invention relates to a method for detecting an abnormal state of a traffic signal, and more particularly, to accurately detect an abnormal state of a traffic signal by making a signal operation step table, measuring a current amount applied to a traffic light, and comparing the step by step. The present invention relates to a traffic signal abnormality detection method.

Generally, traffic lights are installed at intersections to guide traffic and stops and to allow pedestrians to cross the crosswalk safely. The traffic lights are controlled to be lit by a traffic signal controller installed at the intersection. The traffic signal controller maintains a smooth traffic flow even during rush hour by varying the lighting cycles of traffic signals by time zones such as morning, afternoon, evening and night.

The lighting period means the time until the entire green light is sequentially controlled based on the lighting of the green light in a specific driving direction of the vehicle, and the corresponding green light is turned on again. For example, the lighting cycle is composed of a total of 120 seconds, 140 seconds, 160 seconds, etc., and is divided into 1, 2, 3, 4, etc. according to the lighting state of the traffic light in each cycle. In the 120-second cycle, the 1-string is 40 seconds representing the two-way straight signal of the vehicle, the 2-string is 20 seconds representing the two-way left turn signal, the 3-string is 40 seconds representing the two-direction straight signal of the 1-string and the 4-string is represented the cross-direction both left turn signal. 20 seconds or the like.

These lighting cycles and the time of each manifestation are determined by the number of lanes, the width of the crosswalk, and the traffic volume.In order to link signals between intersections and intersections, the traffic signal control center synchronizes the current time of traffic signal controllers. have.

On the other hand, if a situation such as the absence of a traffic light occurs, the control center needs to recognize this as soon as possible. For example, in the absence of a red light for a vehicle, a vehicle may enter an intersection without permission and a large safety accident may occur. Therefore, the control center should promptly identify the abnormal condition of the traffic lights and take prompt measures to respond to the abnormal condition such as blinking the yellow lights.

In the related art, a current applied to a red light for a vehicle is detected and compared with a reference value to detect a member of the red light. However, in the case of a recent LED traffic light, all the red lights controlled by the traffic signal controller branch off from one power line and are supplied with power, and the reference value is set low because the current value is fluctuated by temperature change or dimming control. do. Accordingly, in the conventional detection method, only the entire red light member in which all the red lights are disconnected can be detected.

In addition, in the conventional detection method, even when a red light member is detected, it is not possible to identify which signal light is present in which direction. As a result, when a red light member was detected, the yellow light flickered until the maintenance staff was dispatched. However, there is a problem that causes traffic congestion for a long time by blocking the entire traffic signal even though there is a traffic light in normal operation.

According to the present invention, a signal operation step table for a light cycle and an appearance of a traffic light is generated from a traffic signal controller, and the current detection value is synchronized with the time information of the signal operation step table to determine current leakage or signal absence. It is an object of the present invention to provide a traffic signal abnormality detection method that can accurately identify which fault has occurred and enable active follow-up.

In the traffic signal abnormality detection method according to an embodiment of the present invention, (a) receiving a lighting cycle of the traffic light and the time information for each manifestation in the lighting cycle from the traffic signal controller to create a signal operation step table step; (b) setting a reference current value according to the type and number of lighting of traffic lights for each manifestation in the signal operation step table, and setting a maximum value and a minimum value at a predetermined magnification of the reference current value; (c) detecting a current value applied to the traffic light at the traffic signal controller; (d) synchronizing the detected current detection value with time information for each manifestation in the signal operation step table; (e) applying a synchronized current detection value to the signal operation step table to determine whether it is located between less than the maximum value and more than the minimum value for each manifestation; (f) generating an alarm signal by determining current leakage for the lighting period and appearance when the current detection value is greater than or equal to the maximum value in step (e); And (g) when the current detection value is less than or equal to the minimum value in the step (e), generating an alarm signal by determining that the lighting period and the appearance are absent from the traffic signal.

In the traffic signal abnormality detection method according to another embodiment of the present invention, the alarm signal generated in the step (f) includes the vehicle traveling direction, current detection value, and current leakage information.

In the traffic signal abnormality detection method according to another embodiment of the present invention, the alarm signal generated in the step (g) includes a traveling direction of the vehicle, a current detection value, and traffic signal absence information.

In the traffic signal abnormality detection method according to another embodiment of the present invention, the signal operation step table created in the step (a) includes the lighting cycle and manifestation information of the vehicle traffic light and the pedestrian traffic light for each driving direction of the vehicle.

In the traffic signal abnormality detection method according to another embodiment of the present invention, the signal operation step table created in the step (a) is the operation period and manifestation of the green light remaining time indicator and sound signal operated in conjunction with the pedestrian traffic light It contains more information.

In the traffic signal abnormality detection method according to another embodiment of the present invention, the alarm signal generated in the step (f) or step (g) is transmitted to the remote traffic signal monitoring server.

According to the traffic signal abnormality detection method of the present invention, a signal operation step table is prepared by stepping the lighting cycle and each appearance of the traffic light step by step, and the current detection value is synchronized with the time information for each step to leak the abnormal state of the traffic signal. By judging the traffic signal and the absence of the traffic signal, it is possible to accurately identify the abnormal state of the traffic signal located at a remote location in the monitoring server or the control center to perform an active response in a timely manner.

1 is a diagram illustrating an intersection traffic light configuration to which the present invention is applied;
2 is a flowchart illustrating a traffic signal abnormality detection method of the present invention; and
3 is a view showing an example of a signal operation step table in the present invention.

Hereinafter, specific embodiments according to the present invention will be described with reference to the accompanying drawings. It is to be understood, however, that the invention is not to be limited to the specific embodiments, but includes all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Parts having similar configurations and operations throughout the specification are denoted by the same reference numerals. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

In the following description of the embodiments, redundant descriptions and explanations of techniques obvious to those skilled in the art are omitted. Also, in the following description, when a section is referred to as "comprising " another element, it means that it may further include other elements in addition to the described element unless otherwise specifically stated.

 Also, the terms "to", "to", "to", and "modules" in the specification mean units for processing at least one function or operation, and may be implemented by hardware or software or a combination of hardware and software . In addition, when a part is electrically connected to another part, it includes not only a case directly connected but also a case where the other parts are connected to each other in the middle.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another. For example, without departing from the scope of the present invention, the second component may be referred to as a first component, and similarly, the first component may also be referred to as a second component.

1 is a diagram illustrating an intersection traffic light configuration to which the present invention is applied, FIG. 2 is a flowchart illustrating a traffic signal abnormality detection method of the present invention, and FIG. 3 is a diagram illustrating an example of a signal operation step table according to the present invention. to be.

First, the traffic signal abnormality detection method of the present invention can be applied wherever a traffic light is installed. For example, the present invention may be applied to a crossroad intersection traffic signal system as shown in FIG. 1.

Referring to FIG. 1, a vehicle traffic light 10 is installed in a vehicle traveling direction at a crossroad, and a pedestrian traffic light 20 is installed at a crosswalk. The vehicular traffic light 10 is provided with three vehicular traffic lights 10 in one traveling direction in order to facilitate identification of vehicles stopped in a plurality of lanes, and to prepare for a lighting failure of the traffic lights. do. The pedestrian crossing is provided with one pedestrian traffic light 20 in the opposite direction.

The vehicle traffic light 10 includes a vehicle red light 12, a vehicle yellow light 14, a left turn indicator 16, and a vehicle green light 18. The left turn indicator 16 lights in an arrow shape indicating a left turn direction. Pedestrian traffic light 20 has a pedestrian red light 22 and a pedestrian green light 24. Although not shown, the pedestrian traffic light 20 has a green light remaining time indicator for displaying the remaining time of the pedestrian green light 24, and an acoustic signal for notifying the visually impaired of the pedestrian green light 24 as described below. More can be installed.

In the following description, the traffic signal turns on both left turns after the vehicle goes straight in both directions, and afterwards, the traffic signal is described as an example of a lighting cycle indicating the left turns after both directions in the cross direction. However, the technical spirit of the present invention is not limited to this manifestation configuration, and of course, may be applied to other manifestations. Hereinafter, as shown in the lower part of FIG. 1, the north-south traveling direction of the vehicle is referred to as a 'first traveling direction', and the east-west traveling direction is referred to as a 'second traveling direction'.

Referring to FIG. 2, a step is started by generating a signal operation step table by receiving a lighting cycle of a traffic light and time information for each manifestation in the lighting cycle from a traffic signal controller (ST100).

3 shows an example of preparation of a signal operation step table, and illustrates a signal operation step table for a first lighting period. Although not illustrated, the traffic signal controller may further have a plurality of lighting cycles different from the first lighting cycle for each time zone.

Referring to FIG. 3, the signal operation step table of the first lighting cycle includes a total of 132 seconds including the lighting time of the vehicle yellow light 14. Of these, 66 seconds are allocated to the traffic signal for the first traveling direction and 66 seconds are allocated to the traffic signal for the second traveling direction. In the actual traffic control system, the lighting of the vehicle yellow light 14 is included in the vehicle green light 12 or the left turn indicator 16. However, in the present invention, the table is divided into individual steps to form a separate display. do. The first lighting period is started on the basis of the both straight signals of the vehicle in the first travel direction.

The first manifestation is 40 seconds, and six vehicle green lights 18 are lit (three on each of the two straight signals) and four pedestrian red lights 22 are lit on the first travel direction (two crosswalks respectively). Two), six vehicle red lights 12 are lit and four pedestrian green lights 24 are lit in the second travel direction. In addition to this, four green light remaining time indicators indicating the remaining time of the pedestrian green light 24 for the second travel direction are operated, and an acoustic signal for informing the visually impaired to turn on the pedestrian green light 24. Four more can work.

The second manifestation is three seconds, and six vehicle yellow lights 14 are lit for the first traveling direction, six vehicle red lights 12 are lit for the second traveling direction, and the first traveling direction and the second are lit. The pedestrian traffic lights 20 light up all of the pedestrian red lights 22 in all the traveling directions (eight in total).

The third manifestation is 20 seconds, and simultaneously turns on six left turn indicators 16 and six vehicle red lights 12 with respect to the first travel direction, and is the same as the second manifestation for the other traffic lights.

The fourth manifestation is three seconds, which is the same as the third manifestation except that six vehicle yellow lights 14 are turned on in the first traveling direction, and the left turn indicator 16 and the vehicle red lights 12 are turned off.

The fifth and eighth manifestations are the same as in the first and fourth manifestations, as long as the signals in the first traveling direction and the signals in the second traveling direction are changed as they are.

Referring back to FIG. 2, in the next step, reference current values for each manifestation are set (ST110). At this time, the reference current value is determined according to the type of traffic light and the number of lights. Where the green light remaining time indicator and the acoustic signal are further installed as in the example of FIG. 3, the number of operations of these indicators and the signal is also used to determine the reference current value. If the operating current of the green light remaining time indicator and the acoustic signal is different from the operating current of the traffic light, the reference current value is set by reflecting this.

After setting the reference current value, the maximum value and the minimum value are set at a predetermined magnification of the reference current value. For example, in the first manifestation, a total of 12 vehicle traffic lights and 8 pedestrian traffic lights are turned on, and four green light remaining time indicators and four acoustic signals are operated. That is, a total of 28 luminaires, indicators, and beacons are operated. In order to detect at least one signal member, the minimum value may be set to 'reference current value * (27/28)'. In order to detect two or more signal absence conditions, the minimum value may be set to 'reference current value * (26/28)', and a margin may be given to the minimum value in consideration of a detection error. The maximum value is a comparison value for detecting the leakage current, and may be set to 'reference current value * 1.x'.

Next, the traffic signal controller detects a current value applied to the traffic light (ST120). Then, the detected current detection value is synchronized with the time information for each manifestation in the signal operation step table (ST130). For example, the current detection value is synchronized with the time information for each manifestation in the signal operation step table on the basis of the start of the lighting of the first driving direction vehicle green light 18 indicating the start of the first lighting cycle. The start of the lighting of the vehicle green light 18 in the first traveling direction may be recognized by connecting a signal line to the vehicle green light 18 and reading a time point at which power is turned on. Through this synchronization process, the current detection value can be accurately matched to which manifestation of which lighting period.

Next, the synchronized current detection value is applied to the signal operation step table and compared with the maximum value and the minimum value corresponding to the reference current value for each manifestation (ST140). If the current detection value is located between less than the maximum value and more than the minimum value within the manifest time of the lighting period, the process returns to step ST120 to repeat the current value detection and time synchronization process.

If NO is determined in step ST140, it is determined whether the current detection value is greater than or equal to the maximum value in step ST150. If the current detection value is greater than or equal to the maximum value, it is determined as current leakage with respect to the manifestation of the step (ST160). For example, when the current leakage is determined for the fifth manifestation on the signal operation step table of FIG. 3, the vehicle red light 12, the pedestrian green light 24, the green light remaining time indicator in the first travel direction, Or it means a situation in which a current leakage occurs in the acoustic signal, or the vehicle green light 18 or the pedestrian red light 22 in the second travel direction.

In this case, the flow advances to step ST190 to generate an alarm including abnormal state information. For example, the traveling direction of the vehicle is the 'east-west flow direction', the traffic signal is the above-mentioned traffic lights, indicators and indicators, current detection value, abnormal state information 'current leakage' information to generate an alarm signal Transmit to traffic signal monitoring server (not shown) or control center.

In step ST150, if the current detection value is not greater than or equal to the maximum value, it is determined whether or not it is less than or equal to the minimum value (ST170). If the current detection value is less than or equal to the minimum value, it is determined by the traffic signal member for the manifestation of the step (ST180). For example, when the traffic signal member is determined for the fourth manifestation on the signal operation step table of FIG. 3, the vehicle yellow light 14 or the pedestrian red light 22 in the first travel direction and the vehicle red in the second travel direction. It means a situation in which at least one of the lamp 12 or the pedestrian red lamp 22 is absent.

In this case as well, the flow advances to step ST190 to generate an alarm informing the absence of the traffic signal. For example, the progress direction of the vehicle is the 'North and South mobile flow direction', the traffic signal is the above-mentioned traffic light, current detection value, abnormal state information, the information of 'no traffic signal' generates as an alarm signal traffic signal monitoring server or control Transfer to the center.

In this case, the current detection value may determine how many traffic signals are absent. In the case of the fourth manifestation, the number of traffic lights that are turned on is 20 in total, and it is determined by what percentage of the reference current value set in step ST110, and is absent along with information about the absence of all the fourth manifestation traffic signals or part of traffic signals The number of traffic signals can be determined. Such accurate information enables the control center to identify the abnormal state of the current traffic signal relatively accurately.

The traffic signal fault condition detecting method according to the present invention described above generates a signal operation step table and synchronizes the current detection value with each manifestation of the signal operation step table to detect an abnormal condition of the traffic signal. From the total amount of current applied to the remaining indicator or the acoustic signal of the vehicle, it is possible to accurately recognize in which direction the signal system of the traveling direction of the vehicle has occurred, whether there is a current leakage or the absence of a traffic signal.

The invention described above is susceptible to various modifications within the scope not impairing the basic idea. In other words, all of the above embodiments should be interpreted by way of example and not by way of limitation. Therefore, the scope of protection of the present invention should be determined in accordance with the appended claims rather than the above-described embodiments, and should be construed as falling within the scope of the present invention when the constituent elements defined in the appended claims are replaced by equivalents.

10: vehicle traffic light 12: vehicle red light
14: vehicle yellow light 16: left turn indicator
18: vehicle green light 20: pedestrian traffic light
22: pedestrian red light 24: pedestrian green light

Claims (6)

In the traffic signal abnormality detection method,
(a) generating a signal operation step table by receiving a lighting cycle of a traffic light and time information for each manifestation in the lighting cycle from a traffic signal controller;
(b) setting a reference current value according to the type and number of lighting of traffic lights for each manifestation in the signal operation step table, and setting a maximum value and a minimum value at a predetermined magnification of the reference current value;
(c) detecting a current value applied to the traffic light at the traffic signal controller;
(d) synchronizing the detected current detection value with time information for each manifestation in the signal operation step table;
(e) applying a synchronized current detection value to the signal operation step table to determine whether it is located between less than the maximum value and more than the minimum value for each manifestation;
(f) generating an alarm signal by determining current leakage for the lighting period and appearance when the current detection value is greater than or equal to the maximum value in step (e); And
(g) if the current detection value is less than or equal to the minimum value in step (e), generating an alarm signal by determining that the traffic period is absent for the corresponding lighting period and appearance;
Traffic signal abnormal state detection method comprising a. The method of claim 1,
The alarm signal generated in the step (f) is a traffic signal abnormal state detection method, characterized in that it comprises the direction of travel of the vehicle, the current detection value, and current leakage information. The method of claim 1,
The alarm signal generated in the step (g) comprises a traffic direction, current detection value, and traffic signal absence information, characterized in that the traffic signal abnormality. The method of claim 1,
The signal operation step table created in the step (a) is a traffic signal abnormal state detection method characterized in that it comprises the information on the period and the appearance of the vehicle traffic light and pedestrian traffic light for each direction of the vehicle. 5. The method of claim 4,
The signal operation step table created in step (a) further comprises the operation period and appearance information of the green light remaining time indicator and the sound signal operating in conjunction with the pedestrian traffic light. The method according to any one of claims 1 to 5,
The alarm signal generated in the step (f) or step (g) is a traffic signal abnormality detection method, characterized in that transmitted to the remote traffic signal monitoring server.

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