JPH08329386A - Controller for traffic signal for construction - Google Patents

Abstract

PURPOSE: To obtain the controller for the traffic light for construction which enables accurate and smooth traffic control by providing a detecting means which detects a passing vehicle, a logic means which ORs detection results, and a means which counts detection pulses outputted by the logic means. CONSTITUTION: When the vehicle passes in front of beam sensors 7a, 7b, 7c, and 7d of a vehicle detector 3, detection pulses detected by the beam sensors 7a, 7b, 7c, and 7d are 0Red by an OR circuit 31. The obtained detection pulse S5 is inputted to a sensor circuit 30 to remove a part judged as noise in the detection pulse S5, and the resulting pulse is inputted to a pulse width expanding circuit 32. This pulse width expanding circuit 32 outputs the detection pulse S6 generated by expanding the pulse width of the pulse S5, and a counter 24 counts the detection pulses S6. Pulse width corresponding to a detected body other than the vehicle such as a pedestrian is narrow, so it is removed as nose, so that the precision is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a traffic light control device for construction, and more particularly, to detect the number of vehicles passing in each direction of a construction section in which one side alternates, and based on the detection result. A traffic light control device for construction that calculates the blue time and / or red time of each traffic light for construction installed on both sides of the construction section, and controls the signal switching of each traffic light for construction based on the calculation result. Regarding

[0002]

2. Description of the Related Art When a road is restricted to alternate traffic on one side due to road construction, traffic signals for construction are installed on both sides of the construction section to manage passage / standby of vehicles in each direction. . Conventionally, in this type of construction traffic signal, a timer is used to set a blue signal lighting time for allowing the vehicle to pass and a red signal lighting time for instructing the vehicle to wait, and both sides are set at a predetermined set time. The traffic light for construction is switched on (switching signal).

However, when the blue signal lighting time or the red signal lighting time is set as a predetermined fixed time and the signal is switched every set time, when there is a difference in the traffic volume of the vehicle in each direction, The blue signal lighting time in one direction is wasted, while the other direction causes traffic congestion in the vehicle, and smooth traffic cannot be managed.

Therefore, there is a control method of a traffic signal for construction in which a sensor detects the traffic volume in each direction and adjusts the traffic time and the standby time in each direction of the construction section according to the traffic volume in each direction. Proposed (Japanese Patent Laid-Open No. 5-159197)
(See the official gazette). According to this control method, the interval between the transit time and the waiting time can be adjusted according to the traffic volume,
It has the advantage of smooth traffic.

[0005]

However, the above-described conventional method for controlling a traffic signal for construction work has the following problems. In other words, there are many types of vehicles passing through that have different shapes, heights, lengths, colors, etc., so there are vehicles that do not respond to the sensor even if the sensor tries to detect them, or conversely, one or more vehicles. There are vehicles that are detected as. If there is an error in the detection result of the passing vehicle in this way, the traffic volume is determined based on the detection result of the passing vehicle.Therefore, it is necessary to control the transit time and standby time of the construction traffic signal according to the traffic volume. However, the control does not reflect the actual traffic volume, and smooth traffic management cannot be performed. When controlling the transit time and the waiting time according to the detection result of the traffic volume, there is a time lag between the detection result and the setting of the time, so the set waiting time is set even when the vehicle does not pass at all. The signals will not be switched until the elapse, and it is not possible to switch the signals appropriately according to the traffic volume. And other issues.

The present invention was devised to solve the above problems, and an object thereof is to provide a traffic signal control apparatus for construction for more accurate and smooth traffic management. Especially.

[0007]

A control device for a construction traffic signal according to claim 1 of the present invention as a means for solving the above-mentioned problems is a vehicle in each direction passing through a construction section in which one side alternates. The number of vehicles is detected, the green time and / or the red time of each construction traffic signal installed on both sides of the construction section is calculated based on the detection result, and the green traffic time and / or red time of each construction traffic signal is calculated based on the calculation result. In a control device for a traffic signal for construction that performs signal switching control, vehicle detection means having a plurality of detection means for detecting the passing vehicle; logical means for taking a logical sum of detection results of the vehicle detection means; And a counting means for counting the detection pulses output from the logic means.

The control device for the construction traffic signal according to claim 2 is:
In the control device for the traffic signal for construction according to claim 1,
The pulse width extending means for extending the pulse width of the detection pulse output from the logic means is provided.

The control device for the construction traffic signal according to claim 3 is:
Detects the number of vehicles in each direction passing through the construction section that alternates on one side, and calculates the green time and / or red time of each traffic signal for construction installed on both sides of the construction section based on the detection result. , A construction traffic light control device for controlling signal switching of each construction traffic light based on the calculation result does not detect a vehicle passing for a preset time based on the detection result of the number of vehicles Sometimes, the construction is provided with a compulsory switching means for compulsorily switching between blue and red of the construction traffic light.

[0010]

A control device for a construction traffic signal according to claim 1 of the present invention comprises a vehicle detecting means having a detecting means for detecting a passing vehicle, and a logical means for obtaining a logical sum of detection results of the vehicle detecting means. Since the detection means output from the logic means is provided with the counting means, a vehicle that does not react with one detecting means can be detected, and a vehicle that reacts with a plurality of times can be detected as one vehicle. As a result, the detection accuracy is improved and smooth traffic management can be performed.

The control device for the construction traffic signal according to claim 2 is:
In the control device for the traffic signal for construction according to claim 1,
Since the pulse width extension means for extending the pulse width of the detection pulse output from the logic means is provided, it is possible to detect the vehicle as a single vehicle more accurately, and the detection accuracy is further improved. Smooth traffic management can be performed.

The control device for the construction traffic signal according to claim 3 is:
The blue time elapses because it is equipped with a compulsory switching means that compulsorily switches between blue and red of each traffic light for construction when a vehicle passing for a preset time based on the detection result of the number of vehicles is not detected. It will soon be possible to switch signals, and it will be possible to control traffic signal switching closer to the actual traffic volume for smooth traffic control.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. 1 is an explanatory view of a construction traffic light system according to the present invention, FIG. 2 is a block diagram of a construction traffic light control device according to the present invention, and FIG.
4 is a block diagram of a vehicle number detecting / counting unit of the control device, FIG.
6 and 6 are explanatory views for explaining the operation of the control device.
FIG. 3 is an explanatory diagram of another construction traffic signal system according to the present invention.

The construction traffic light system of this embodiment is
Main-side traffic signal 1, sub-side traffic signal 2, vehicle detectors 3 and 4 for detecting a passing vehicle, and handy unit 5 for performing various settings for main-side traffic signal 1 and sub-side traffic signal 2. And have. And
The main-side traffic signal 1 and the vehicle detector 3, and the sub-side traffic signal 2 and the vehicle detector 4 are installed near the entrances and exits of the sections where one-sided traffic passes, and the main-side traffic signal 1 and the sub-side traffic signal 2 Are connected by a cable 6.

First, the vehicle detectors 3 and 4 are four reflection type beam sensors 7a and 7 which are a plurality of detecting means, respectively.
It has b, 7c and 7d. These reflection type beam sensors 7a, 7b, 7c, 7d can detect various height positions of the vehicle by vertically arranging them, so that more accurate detection can be performed. The detecting means is not limited to the reflection type beam sensor, but a beam sensor is used here in consideration of durability and installation state. Further, the number of detecting means provided in the vehicle detectors 3 and 4 is not limited to four.

The main traffic signal 1 is a signal unit 1
1, control board 12, display board 13, and switch unit 1
4, a liquid crystal display 15, a wireless unit 16, a power supply unit 17, and the like.

The signal unit 11 has a red indicator (red signal) 21, a blue indicator (blue signal) 22, and a display unit 23 for displaying "waiting time" and "displaying characters such as stop and slow drive". . The control board 12 stores a counter 24 that is a counting unit that counts the number of vehicles passing through, a microcomputer 25 that also functions as a forced switching unit according to the present invention that controls the entire traffic light 1, and various setting information and the like. It has an EEPROM (rewritable non-volatile memory) 26 and a circuit for processing a detection signal from the vehicle detector 3 to generate a detection pulse.

The display substrate 13 has a microcomputer 27 that controls the signal unit 11, and an EPROM 28 that stores various settings and measurement information. The switch unit 14 has a switch for setting the initial state and the like of the traffic signal 1, and the liquid crystal display 15 is for displaying the setting state and the like of the traffic signal 1. The wireless unit 16 has an antenna 16 a, and receives a signal transmitted from the handy unit 5 to control the control board 12.
This is a unit for forcibly switching the signals of the red display device (red signal) 21 and the blue display device (blue signal) 22 via, for example, both the signal devices so as to be red signals.

On the other hand, the sub-side traffic signal 2 communicates with the main-side traffic signal 1 via the cable 6 for information necessary for setting various conditions, calculation information of green time and red time, and counting the number of passing vehicles. In order to send and receive various kinds of information such as information, the switch unit 14, the liquid crystal display 15, and the wireless unit 1 described above.
Since it is different from the main traffic signal 1 in that it does not have 6, the detailed description thereof will be omitted.

As shown in FIG. 3, the vehicle number detecting / counting unit provided in the main traffic signal 1 and the sub traffic signal 2 has a logical sum circuit 31 as a logical means and a sensor circuit 30 for removing noise, as shown in FIG. And a pulse expansion circuit 32 which is a pulse width expansion means, and a counter 24 which is a counting means.

The OR circuit 31 includes detection pulses S1 from the beam sensors 7a, 7b, 7c and 7d of the vehicle detector 3.
The logical sum of S2, S3 and S4 is calculated, and this detection pulse S5
In the next sensor circuit (noise removal circuit), an integration circuit and a comparison circuit are used, and a detection pulse (signal) having a pulse width that is too short among the detection pulses S5 is determined to be noise and ignored. Only the detection pulse S5 which is determined not to be output to the pulse width expansion circuit 32. The pulse width expansion circuit 32 detects the detection pulse S5 from the OR circuit 31.
To output a detection pulse S6 having a predetermined width, for example, a detection pulse S6 having a predetermined pulse width from the rising edge of the detection pulse S5 to the counter 24 using a mono-multivibrator. The counter 24 is a microcomputer 25
The detection pulse S6 from the pulse width expansion circuit 32 is counted (counted) under the control of the set and reset signals.

The operation of the vehicle number detecting / counting unit in the construction traffic signal system of this embodiment will be described with reference to FIGS. 4 and 5. First, when the vehicle is the beam sensor 7a of the vehicle detector 3 (the vehicle detector 4 is also the same),
When passing in front of 7b, 7c, 7d, the detection pulse obtained by detecting the passing vehicle by the beam sensors 7a, 7b, 7c, 7d is ORed by the OR circuit 31. S5 is input to the sensor circuit (noise removal circuit) 30, the portion of the detection pulse S5 that is determined to be noise is removed, and it is input to the pulse width expansion circuit 32. The pulse width expansion circuit 32 outputs the pulse width of the detection pulse S5. The detection pulse S6 obtained by extending the
The number of detection pulses S6 is counted with.

Here, the beam sensor 7 of the vehicle detector 3
The a, 7b, 7c, and 7d may not react to a passing vehicle or may react to one passing vehicle a plurality of times. Further, although the vehicle does not pass through, it may react to foreign matter such as passersby other than the vehicle. For example, as shown in FIG. 4, the beam sensors 7a, 7b of the vehicle detector 3,
Of the 7c and 7d, the beam sensor 7a reacts to the passing vehicle with a certain degree of accuracy, and a detection pulse S1 as shown in FIG. 7A is output, while the other beam sensor 7b is applied to the passing vehicle. In response to the rotation, two detection pulses S2 are output as shown in FIG.
Does not react to the passing vehicle and does not output the detection pulse S3 as shown in FIG. 7C, or the beam sensor 7d
Reacts only to a part of the passing vehicle and outputs a detection pulse S4 having a short pulse width as shown in FIG.

Even in such a case, the OR circuit 3
1 takes the logical sum of the detection pulses S1, S2, S3, S4 and outputs it as the detection pulse S5, so the logical sum circuit 31
Then, the detection pulse S5 when one vehicle is detected is output as shown in FIG. At this time,
The beam sensors 7a, 7b, 7c, 7d of the vehicle detector 3 are extremely unlikely to output detection pulses at completely different timings, so the beam sensors 7a, 7b, 7c, 7d
The passing vehicle can be accurately detected by taking the logical sum of the detection pulses S1 to S4 from d.

Thus, the detection pulse S5 is provided by providing the vehicle detector 3 having a plurality of detection means (beam sensors 7a to 7d) and the logical sum circuit 31 for obtaining the logical sum of the detection results of the vehicle detector 3. When the detection pulse S5 (which means the pulse on the right side of S5) is generated by the sensor circuit 30 in response to a foreign matter such as a passerby other than the vehicle, this pulse is detected by another sensor. Pulse S5 (S
The pulse width is narrower than that of the pulse on the left side of FIG. 5). Therefore, the detection pulse S6 is output by removing it as noise, and the detection pulse S6 is counted by the counter 24. One detection means can detect a vehicle that does not react, and a vehicle that reacts a plurality of times can also be detected as one vehicle. Therefore, the accuracy of detecting the number of passing vehicles is improved. You will be able to manage traffic smoothly.

Further, in the present embodiment, the detection pulse S6 output from the sensor circuit 30 via the OR circuit 31.
A pulse width expansion circuit 32 for expanding the pulse width of
The detection pulse S7 output from the pulse width expansion circuit 32
Are counted by the counter 24. This is the same as the beam sensors 7a, 7b, 7c, 7d as described above.
Even if the logical sum of the respective detection pulses S1 to S4 corresponding to the detection signal from is taken, for example, as shown in FIG. 5A, the logical sum circuit 31 outputs three detection pulses S5 to one passing vehicle. May be done.

Therefore, when the pulse width expansion circuit 32 is provided and a certain detection pulse S6 from the OR circuit 31 and the sensor circuit 30 is inputted, the detection pulse inputted until the time of the pulse width Ts elapses. I am trying to ignore S6. As a result, one detection pulse S6 is output from the pulse expansion circuit 32 regardless of the number of detection pulses S6 input from the logical sum circuit 31 as shown in FIG. Then, the detection pulse S7 is counted by the counter 2. By this, 1
Since the possibility that a plurality of detection pulses are output to a single vehicle is significantly reduced, the passing vehicle can be detected more accurately.

Here, the pulse width Ts of the detection pulse S7 output from the pulse width expansion circuit 32 is determined in advance according to the expected passing speed of the vehicle and the inter-vehicle distance. In this case, if the pulse width Ts is made longer, the possibility of multiple detections is reduced, but if it is made too long, it will lead to the detection result of the vehicle passing next. It is preferable to make a decision accordingly.

In this embodiment, the expected maximum passing speed is 80 k.
Under these conditions, the maximum passing speed is converted to a speed of 22.22 m / se under the conditions of m / h and a minimum inter-vehicle distance of 10 m.
c, therefore the minimum inter-vehicle time is 450 ms,
It is set to 400 ms with a margin in mind.

The construction traffic light system shown in FIG.
In the second embodiment, a main traffic signal 31, a sub traffic signal 32, and a vehicle detector 3 for detecting a passing vehicle.
3, 34 and a handy unit (not shown) for making various settings for the main traffic signal 31 and the sub traffic signal 32.

Here, the main traffic signals 31, 32
Is held on a carriage platform 37, which has wheels 36 at the bottom thereof and is movable, via a pantograph-type shock absorber 38,
The vehicle detectors 33 and 34 are both mounted on the right side or the left side of the vehicle carrier 37. This vehicle detector 33, 34
The mounting position of is changed to the position shown by the solid line or the position shown by the phantom line depending on whether the construction section is up or down. Then, the carriages 37, 37 are moved to install the main traffic signal 1 and the vehicle detector 3 and the sub traffic signal 2 and the vehicle detector 4 near the entrances and exits of the sections where one side traffic is performed.

The main traffic signal 31 and the sub traffic signal 32 have substantially the same structure as the main traffic signal 1 and the sub traffic signal 2 of the above-mentioned embodiment, but in this embodiment, they are connected to each other. In order to send and receive various information of the wireless by wireless, the sub-side traffic signal 32 also has a wireless unit 16
It is different in that it is equipped with. The main traffic signal 3
The 1 and sub-side traffic signal 32 is provided with a satellite 39 at the top. Further, the configurations of the vehicle detectors 33 and 34 are the same as the configurations of the vehicle detectors 3 and 4 of the above-described embodiment.

Next, the operation relating to the signal switching control of the control device in each of the above embodiments will be summarized.
The abbreviations used in the following description have the following meanings. T1 = basic green time on one side (main side or sub side). T2 = Time when both basic sides (main side and sub side) are red. T3 = minimum green time. T4 = time from when the count value (count value) of the number of passing vehicles on the main side and the sub side becomes the same until the signal turns blue. T5 = Time to forcibly turn red when there is no vehicle passing for a certain period of time even though it is blue. T6 = time to blink blue before switching from blue to red In addition, these times T1 to T6 are for the handy unit 5
Is a preset time from, and is stored in the EEPROM 28.

K1 = reflection ratio of passing vehicle ratio K2 = reflection ratio of varying vehicle ratio These reflection ratios K1 and K2 are R of the microcomputer 25.
It is stored as fixed information in the OM or the EEPROM 28.

D = number of vehicles actually passing during green hour D1 = number of vehicles passing per hour for green time H1 = ratio of number of vehicles passing up and down per hour H2 = number of vehicles passing per hour varying from the previous time H3 = upstream Downstream time-varying ratio HH1 = Average passing vehicle ratio (moving average of past 5 times) HH2 = Average fluctuating vehicle ratio (moving average of past 5 times) TG = Blue time determined by calculation TS = Counter value Both of them (main side and sub side) see red time a, b = either up or down (when a is up, b is down)

(1) Green time calculation processing The green time of the signal is calculated by calculating from the number of passing vehicles (count value D of the counter 24) on the up and down sides,
Change the green time every time. That is, after turning on the power,
The green time T calculated for each time as shown in Table 1 and Table 2.
Ga, TGb and passing numbers Da, Db are taken in, and passing numbers D1a, D1b per hour with respect to green time, up / down passing number ratios H1a, H1b, fluctuating number ratios H2a, H2b from the previous time, up / down time Fluctuating number ratio H3a, H3b, average HH1 of passing five times
a, HH1b, the ratio of fluctuations in the past five times HH2a, HH2
b is calculated to calculate the next green times TGa and TGb.

[0037]

[Table 1]

[0038]

[Table 2]

The calculation formula of each data is as follows. In each formula, "n" means that the blue color after power-on is the nth time. Number of vehicles passing per hour for green hour D
1a and D1b are obtained by equations 1 and 2. D1an = Dan {TGan / (TGan + TGbn))} ... 1 D1bn = Dbn {TGbn / (TGan + TGbn))} ... 2

The ratio H1a, H1b of the number of passing cars in the up and down directions is
It is calculated by Equations 3 and 4. H1an = D1an / (D1an + D1bn) ... 3 H1bn = D1bn / (D1an + D1bn) ... 4

The ratio H2a, H2b of the number of passing vehicles per hour from the previous time is calculated by the equations (5) and (6). H2an = D1an-D1an-1 ... 5 H2an = D1an-D1an-1 ... 6

Up / down fluctuation time ratio H3
a and H3b are obtained by the equations 7 and 8. H3an = H2an / (H2an + H2bn) ... 7 H3bn = H2bn / (H2an + H2bn) ... 8

Average HH1a, H of the past five passing vehicle ratios
H1b is obtained by equations 9 and 10. HH1an = (H1an-4 + H1an-3 + H1an-2 + H1an-1 + H1an) / 5 ... 9 HH1bn = (H1bn-4 + H1bn-3 + H1bn-2 + H1bn-1 + H1bn) / 5 ... 10

Further, the average HH2 of the fluctuating numbers of the last five times
a and HH2b are obtained by the equations 11 and 12. HH2an = (H3an-4 + H3an-3 + H3an-2 + H3an-1 + H3an) / 5 ... 11 HH2bn = (H3bn-4 + H3bn-3 + H3bn-2 + H3bn-1 + H3bn) / 5 ... 12

The next calculated green times TGa and TGb are
It is obtained by the equations 13 and 14. TGan = T * (HH1an-1 * K1) + (HH2an-1 * K2) ... 13 TGbn = T * (HH1bn-1 * K1) + (HH2bn-1 * K2) ... 14

By performing the above calculation, the blue time TGa, T
Change Gb. In this case, the green time is 1 second,
Round less than 1 second. Also, the blue blinking time is included in the blue time. That is, the blue blinking is 10 when the blue time is 30 seconds.
In terms of seconds, the lighting of blue is 20 seconds and the blinking of blue is 10 seconds.

However, in the following cases, control is given priority over the calculated green time. Up to 6 times (n = 6 above) after power is turned on, the above formula 1
Since the data necessary for the calculation are not available as can be seen from the expression (12), the blue times TGa and TGb are set to the times determined by the initial setting. That is, TGa1 = TGa2 = TGa3 = TGa4 = TGa5 =
TGa6 = T1 TGb1 = TGb2 = TGb3 = TGb4 = TGb5 =
Let TGb6 = T1.

If the calculated blue time is smaller than the minimum blue time T3 set in the initial setting, the minimum blue time T
Set to 3 for maximum green time on the other side, and if greater than maximum green time, set for maximum green time and the other side for minimum green time. The maximum blue time is calculated by the equation 15 from the basic one-side blue time T1 and the minimum blue time T3. Maximum green time = T1 * 2-T3 ... 15

If there is no vehicle that passes blue for a certain period of time, that is, if there is no vehicle that passes for time T5 between the green time TG initial value displays, the time T
Flashes blue for 6 and then turns the opposite side to blue after a lapse of time T2. However, in this case, the subsequent blue time is calculated on the assumption that it was originally blue during the calculated blue time TG. For example, if the blue time is forcibly finished at the blue time TG '(including blinking blue), when the number of vehicles that actually passed during TG' = D ',
Obtained in 6) D = D '* (TG / TG') ... 16

(2) Red time setting The time when both are red is the time T4 from the time when both signals become red until the count value of the entrance vehicle detector and the count value of the exit vehicle detector become equal. Is the time added. However, the minimum is (T2 / 2 + T4), and the maximum is T2. That is, it is from time (T2 / 2) to determine whether the count values are the same. If the count values do not become the same even at T2, the signal is switched at that time. Also, this control is performed during the sixth blue time after the power is turned on.

(3) Various time setting times T1 to T5 have initial values and can be changed by setting. The changed value is stored in the EEPROM. The initial value, maximum value, and minimum value at each time are as shown in Table 3. The setting operation method is as shown in Table 4.

[0052]

[Table 3]

[0053]

[Table 4]

After entering the various setting modes by operating the buttons shown in Table 4, a numerical value up button (for example, "1" button is assigned) and a numerical value down button (for example, "2" button is assigned) are operated to set numerical values. Change to "SET"
By pressing the button,
"Change" is displayed, so "SET" again
The setting change is confirmed by pressing the button.

(4) Display item setting The contents displayed on the liquid table display are set. Here, the modes shown in Table 5 are provided as the operation modes. The setting method is shown in Table 6. The registered contents (see the column of order 3 in Table 5) are as shown in Table 7.

[0056]

[Table 5]

[0057]

[Table 6]

[0058]

[Table 7]

It should be noted that the present invention is not limited to the above-described embodiments, but includes configurations that can be modified and implemented within the scope without changing the gist of the present invention. Incidentally, in the above-described embodiment, as shown in FIG. 3, after the detection pulse detected by the beam sensor is logically ORed by the OR circuit,
The noise component of the logical sum pulse is removed by the next sensor circuit, and the pulse width is extended by the pulse width extension circuit. However, as shown in FIG. 7, the beam sensors 7a, 7b, 7c are used. , 7d, the detection pulses detected by the sensor circuits (noise removal circuits) 70a, 70b, 70
It is also possible to have a configuration in which the detection pulse is input to the logical sum circuit 71 after the noise component is removed in advance at c and 70d.

[0060]

As is apparent from the above description, according to the control device for the construction traffic signal of claim 1, the vehicle detecting means having the detecting means for detecting the passing vehicle, and the respective detecting means of the vehicle detecting means. Since the logic means for taking the logical sum of the results and the counting means for counting the detection pulses output from the logic means are provided, it becomes possible to detect even a vehicle that does not react with one detection means, and a plurality of reactions. Even in vehicles that do
Since the vehicle can be detected as one vehicle, the detection accuracy is improved, and smooth traffic management can be performed.

According to the control device for the construction traffic signal of claim 2, in the control device for the construction traffic signal according to claim 1, pulse width expansion means for expanding the pulse width of the detection pulse output from the logic means. Since the vehicle is provided, the vehicle can be detected more accurately as one vehicle, the detection accuracy is further improved, and smooth traffic management can be performed.

According to the construction traffic light control device of the present invention, the blue / red of each construction traffic light is detected when no vehicle passing through is detected for a preset time based on the detection result of the number of vehicles. Since the forced switching means for forcibly switching is provided, it is possible to switch signals before the green time elapses, and to perform switching control of traffic signals closer to the actual traffic volume for smooth traffic control. There is an effect that can be.

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a construction traffic light system according to the present invention.

FIG. 2 is a block diagram of a construction traffic signal control device according to the present invention.

FIG. 3 is a block diagram of a vehicle number detecting / counting unit of the control device.

FIG. 4 is an explanatory diagram for explaining the operation of the control device.

FIG. 5 is an explanatory diagram for explaining the operation of the control device.

FIG. 6 is an explanatory diagram of another construction traffic signal system according to the present invention.

FIG. 7 is a block diagram of a vehicle number detection / counting unit of the control device.

[Explanation of symbols]

1 ... Main side traffic signal, 2 ... Sub side traffic signal,
3, 4 ... Vehicle detector, 5 ... Handy unit,
6 ... Cable, 7a, 7b, 7c, 7d ... Beam sensor, 11 ... Signal unit, 12 ... Control board, 13 ... Display board, 14 ... Switch part, 15
... Liquid crystal display, 16 ... Wireless unit, 21 ...
・ Red display, 22 ... Blue display, 24 ... Counter, 30 ... Sensor circuit, 31 ... Logic circuit, 3
2 pulse expansion circuit

Claims (3)

[Claims] 1. The number of vehicles in each direction passing through a construction section that alternates on one side is detected, and based on the detection result, the green time and / or the green time of each construction traffic signal installed on both sides of the construction section. In a traffic light control device for construction, which calculates a red time and controls signal switching of each traffic light for construction based on the calculation result, vehicle detection means having a plurality of detection means for detecting the passing vehicle, A control device for a construction traffic signal, comprising: a logic means for taking a logical sum of the detection signals of the vehicle detection means; and a counting means for counting the detection pulses output from the logic means. 2. The construction traffic signal control device according to claim 1, further comprising pulse width expansion means for expanding the pulse width of the detection pulse output from the logic means. Traffic light control device. 3. The number of vehicles in each direction passing through a construction section that alternates on one side is detected, and based on the detection result, the green time and / or the green time of each traffic signal for construction installed on both sides of the construction section. In a traffic light control device for construction that calculates the red time and controls signal switching of each traffic light for construction based on the calculation result, passing through for a preset time based on the detection result of the number of vehicles A control device for a construction traffic signal, comprising: a compulsory switching means for compulsorily switching between blue and red of each of the construction traffic signals when no vehicle is detected.