JPH0540897A - Alternate traffic signal controller - Google Patents

Abstract

PURPOSE:To control the blue/red signal time in accordance with the traffic volume by shortening the basic time by a control circuit or reducing the several additional times to be added to the basic time. CONSTITUTION:The signal lamp devices 14a and 14b where the holding side show the red signals when the advancing sides show the blue signals are provided at the both ends of an alternating traffic section together with the detectors 16a and 16b which detect the presence or absence of the passing cars. Under such conditions, the time obtained by adding several additional times to the basic time based on the signal transmitted from the detector 16a of the advancing side is used as the prescribed time. If no signal is transmitted from the detector 16a for a fixed time, the basic time is shortened or the additional times to be added to the basic time are reduced. Thus the prescribed time is shortened by a control circuit 22. The circuit 22 controls the blue signal time of the device 14a of the advancing side. Thus the blue/red signal time is controlled based on the presence of the actually passing cars.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an alternating traffic signal control device for controlling a blue-red signal time in an alternating traffic section according to a traffic volume.

[0002]

2. Description of the Related Art Japanese Patent Laid-Open No. 62198/1993 discloses a device that changes the signal time for blue and red depending on the traffic volume. This is equipped with signal lights that turn red on the waiting side when both sides of the alternate traffic section are green, and detectors that detect the number of vehicles waiting outside this section. It is intended to lengthen the green light time of the traffic light.

[0003]

However, according to this method, since the detector has to count the number of vehicles waiting, one or more detectors must be installed at a place distant from the signal lamp. In addition, it requires a lot of time and effort to install the detector and wiring work, and it is necessary to pay attention to the protection of the installed wiring, which results in high cost.
Also, because the absolute number of vehicles waiting and the length of green light time are not related, if the number of vehicles waiting on the advancing side is particularly large, the green light time will be very long. Is also expected. The present invention addresses such a problem and, in essence, controls the blue-red signal time based on the presence of an actual vehicle passing through.

[0004]

In order to solve the above-mentioned problems, the present invention is directed to detecting the presence or absence of a passing vehicle, and a signal light device in which the standby side becomes a red signal when the advancing side is a green signal at both ends of an alternate traffic section. The standard time is set by adding several additional times to the basic time based on the signal emitted from the detector on the advancing side, and when this signal is not emitted within a certain time (EN) An alternating traffic signal control device in which a green signal time of a signal lamp on the advancing side is controlled by a control circuit which shortens time or shortens a prescribed time by reducing an additional time added to a basic time.

[0005]

With the above means, when the vehicle passing through the vehicle has a green light on the traveling side, the control circuit shortens the basic time or adds several times to the basic time when the vehicle has a certain time interval. Save time. Therefore, the signal is switched in a time shorter than the regular specified time obtained by adding the predetermined additional time to the basic time, and the signal is adapted to the actual situation.

[0006]

[Embodiment] FIG. 6 is an explanatory view showing a state of installation of signal lamps. When a passage-impossible section 12 is generated on one side of the road 10 due to construction or the like, signal lamps 14a are provided at both ends of the passage-impossible section 12. 14b is installed, and when one is a green traffic light, the other is a red traffic light so that one side is allowed to alternate. In the present invention,
The signal lamps 14a and 14b are provided with detectors 16a and 16b for detecting passing vehicles. The detectors 16a and 16b may be of the optical type, the sound type, the thermal type, or the like, as long as the presence / absence of a vehicle passing by the signal lamps 14a and 14b can be detected.

FIG. 1 is a block diagram of the present invention. A control circuit 22 coupled to a time setting circuit 18 and an automatic / manual selection circuit 20 is provided, and the signals emitted from the detectors 16a and 16b described above are supplied to this control circuit. It is input to 22 and the lighting time of both signal lamps 14a and 14b is controlled in a state according to the actual traffic volume.

FIG. 2 is a pattern diagram showing the control status of the control circuit 22. The automatic / manual selection circuit 20 is switched to the automatic side, and the time setting circuit 18 is provided with the basic extension time timer T _A.
When the basic extension time is set in, the basic extension time timer T _A starts when one of the signal lamps 14a (on the advancing side) becomes a green light and the time is up at the set time (when the measurement of the set time is completed and the signal is turned on). To work). When the basic extension time timer T _A times out, the control circuit 22
The basic time timer T ₁ also starts and times up, and subsequently the basic time timers T ₂ , T ₃ and additional time timers T _{4 to} T ₉ start and time up (timers T _{1 to} T ₃ time up sequentially. the basic time to, the timer T ₄ through T ₆ is the first additional time to turn time-up, until the timer T ₇ through T ₉ are sequentially time-up is the second additional time, obtained by adding these ( Strictly speaking, the basic extension time that the basic extension time timer T _A times up is also added) is defined as). When the additional time timer T ₉ times out, the flash time timer T ₁₀ for setting the flash time and the both red time timer T for making both the signal lamps 14a and 14b red signals.
Waiting for _B to time up, the signal lamp 16b on the standby side turns into a green light.

On the other hand, the basic extension time timer T_ATime
At the same time as up (basic time timer T₁After that, detector 1
(When the detection signal from 6a is turned off) A vehicle detection timer
-T ₁₁Starts, but this timer detects the progress side
It is reset when the detection signal comes in from the device 16a.
Here, the basic time and the additional time timer T₁~ T₉But
This moving vehicle detection
Immer T₁₁On the condition that they have not timed up
deep. That is, the signal lamp 14a on the traveling side is set at a constant time interval.
If the vehicle is passing at
Of the standard time that added the first and second additional time to the basic time
It is lit by a green light.

FIG. 3 is also a pattern diagram showing the control situation of the control circuit 22, for example, basic time timers T ₂ and T ₃
In the time zone, for a sufficient time to progress vehicle detection timer T ₁₁ breaks in the detection signal to be time-up from the detector 16a, in other words, the traveling side signal lamp 14
When the vehicle passing through a is cut off for a certain period of time, the measurement of the basic time timer T ₃ is ended and the flash time timer T ₁₀ is immediately shifted. This operation is kept as even to perform a basic time and time zone of the first, second additional time timer T ₂ through T ₉ throat.

FIG. 4 is a pattern diagram showing the control situation when the traveling vehicle passing through the signal lamp 14a on the traveling side is sparse. In such a case, the traveling vehicle detection timer T ₁₁
Will not time up, but there will be a situation where no vehicle is traveling during the basic time timer T ₂ . In this case, the first additional time storage relay M _1, which is turned on when the basic time timer T ₃ is up, is not turned on, but is immediately moved to the flash time timer T ₁₀ . This operation is also the first, a time band of the second additional time timer T ₄ through T ₉ throat leave as is to perform, the second additional time storage relay which is turned on at time-up of the first additional time timer T ₆ M ₂ and the second additional time timer T ₉ are turned on, and the multi-vehicle memory relay M ₃ is not turned on.

FIG. 5 is a pattern diagram showing the control situation when there are many vehicles waiting by the signal lamp 14b on the standby side.
If the first additional time storage relay M _1B on the standby side is turned on immediately before the signal lamp 14a on the traveling side is switched to the green signal,
This means that there are many vehicles on the standby side. In this case, therefore, even if there are many vehicles on the advancing side, the additional time is limited to the first additional time, and if the first additional time timer T ₆ expires. Immediately, the flash time timer T ₁₀ is entered. In this state, there are many vehicles in both directions, so both parties pass through a slightly larger number of vehicles with a 1: 1 time width.

On the other hand, when the traffic on the advancing side starts and the vehicle on the advancing side has a small number of vehicles on the advancing side and the memory relay M _3A on the advancing side is turned on, the next green signal on the standby side causes the first additional time memory relay M _1B to temporarily turn on. Even if it is turned on, if the next green signal on the advancing side is absolutely heavy on the advancing vehicle, it may be possible to allow the advancing side a second additional time to lengthen the absolute green signal time on the more advancing side. ..

[0014]

As described above, according to the present invention, when there is no vehicle passing through the signal lamp on the traveling side or when there is a break for a certain period of time,
It is to cut off the regular stipulated time to turn on as a green light and immediately switch it to a red light.Furthermore, this is to consider the amount of vehicles waiting on the signal light on the standby side. It is very efficient in line with the above conditions and promotes smooth flow of the vehicle. That is, if there is a side where there is no signal waiting vehicle and a side where there is congestion, the lighting time width of the green signal is a maximum ratio of 1: 6 except for the time-up time of the basic extension time timer. When there is neither or both, the time ratio is 1: 1. On the other hand, in the case of the middle, the lighting time width of the green signal automatically changes depending on the situation.

[Brief description of drawings]

FIG. 1 is a block diagram of the present invention.

FIG. 2 is a pattern diagram showing a control situation of a control circuit.

FIG. 3 is a pattern diagram showing a control situation of a control circuit.

FIG. 4 is a pattern diagram showing a control situation of a control circuit.

FIG. 5 is a pattern diagram showing a control situation of a control circuit.

FIG. 6 is an explanatory diagram showing a state of installation of a signal light device.

[Explanation of symbols]

 14a Signal light device on the advancing side 14b Signal light device on the standby side 16a Passing vehicle detector 16b on the advancing side Passing vehicle detector 22 on the waiting side 22 Control circuit

Claims (2)

[Claims] 1. A traffic light device (14a) in which the standby side becomes a red signal when the traveling side is a green signal at both ends of the alternating traffic section,
(14b) and a detector (16 for detecting the presence or absence of a passing vehicle)
a) and (16b) are installed respectively, and the addition of several additional times to the basic time based on the signal emitted from the detector (16a) on the traveling side is set as the specified time, and this signal is constant. When it is not emitted within the time, the green time of the advancing side signal lamp (14a) is controlled by the control circuit (22) that shortens the basic time or reduces the additional time added to the basic time to shorten the specified time. Alternate traffic signal controller. 2. The control circuit (22) is provided with a detector (1) on the standby side.
6. The alternating traffic signal control device according to claim 1, wherein when the signal generated from 6b) within a certain time is stored, the additional time added is limited within a certain range to shorten the specified time.