JP5629661B2 - Traffic signal control system - Google Patents

Description

  The present invention relates to a traffic signal control system, and more particularly to a traffic signal control system that controls lighting and extinction of a signal lamp in an intersection by a controller.

  At intersections or pedestrian crossings, multiple signal lights (traffic signal lights) are installed at predetermined positions, and the blue, yellow, red, blue arrows, etc. of each signal light are turned on or off at predetermined time intervals. Traffic signal control systems that perform control repeatedly have been put into practical use. Along with recent technological advances, various technical developments related to traffic signal control systems have been carried out. One of the highly demanded technologies in such technology development is a technology related to cost reduction and simplification of installation work, and several such technologies have been proposed (see, for example, Patent Documents 1 and 2). .)

  In the technique disclosed in Patent Document 1, the traffic signal controller is reduced in size, manufacturing cost is reduced, and installation work is further facilitated. Moreover, in the technique disclosed in Patent Document 2, in the signal control system provided with the vehicle detector, the number of power lines is reduced to reduce the cost required for installation work and shorten the construction period.

JP 2008-40610 A JP 2008-97416 A

  By the way, in the conventional signal control system, the controller and the signal lamp are connected by a solid line, and the signal lamp is turned on and off by the controller. In addition, 1 to N wiring (for the number of signal lamps) is required between the controller and the signal lamp. In the technique disclosed in Patent Document 1, distribution of commercial power sources and improvement in the degree of freedom of connection work to those commercial power sources are attempted. However, further reduction in wiring has been demanded. Further, in the technology disclosed in Patent Literature 2, although a certain effect is obtained in a system including a vehicle detector, the effect is partial, and further improvement has been demanded.

  This invention is made | formed in view of the above situations, Comprising: It is providing the technique which solves the said subject.

The present invention, n number (n; natural number, n ≧ 2) and the signal lamp device of a traffic signal control system including a controller for controlling the n signal lamp device, the first from the control device 1 to 1 connected to the signal lamp, 1 to 1 connected from the first signal lamp to the second signal lamp, sequentially connected to the next signal lamp on a one to one basis, and the last nth signal lamp A control signal line that is connected to the controller in a one-to-one relationship, is connected in series with the controller and the n signal lamps, and transmits a control signal for driving the lamp of each signal lamp unit from the controller. A power supply line that is wired in a ring from the controller, and that is branched off from the ring wiring to supply power to each of the n number of signal lamps, and the controller has the signal lamp turned on or off. A control signal including a lamp control code for controlling the lamp is output to the control signal line. A communication control unit configured to acquire the control signal transmitted through the control signal line; and each signal lamp receives the control signal from the control signal line, and receives the control signal from the received control signal. A communication / lamp drive control unit that controls the driving of the lamp based on the lamp control code and outputs a lamp display code indicating the content of lighting of the lamp to the control signal line .
The controller may determine that the communication with the signal lamp is abnormal when the control signal is transmitted and the lamp display code is not received within a predetermined time.
The communication control unit sequentially outputs the lamp control codes of the n number of the signal lamps to the control signal line at a predetermined interval, and the communication / lamp drive control unit includes the lamp for itself. When the communication control unit receives the lamp display code after the control code, transmits the control signal line and returns, the same signal lamp is targeted after the lamp control code of the signal lamp. The lamp control codes of the n signal lamps may be sequentially received by using the lamp control codes as a pair.

  As mentioned above, according to this invention, the traffic signal control system which reduced the power supply line and the control line is realizable.

It is the figure which showed arrangement | positioning of the traffic signal control system in the intersection based on Embodiment. It is a functional block diagram of the traffic signal control system based on Embodiment. It is a functional block diagram of a signal lamp device concerning an embodiment. It is the chart which showed the example of transmission / reception of a control code and a display code based on an embodiment. It is the figure which showed the example of the control code and display code based on embodiment.

  Next, modes for carrying out the present invention (hereinafter, simply referred to as “embodiments”) will be specifically described with reference to the drawings. FIG. 1 is a diagram showing an arrangement of a configuration of the traffic signal control system 10 at an intersection 12 according to the present embodiment. FIG. 2 is a functional block diagram showing the configuration of the traffic signal control system 10 according to the present embodiment. Further, FIG. 3 is a functional block diagram showing a configuration of the signal lamp device 20.

  The traffic signal control system 10 includes a signal lamp 20 and a controller 50. In FIG. 1, the signal lamp 20 includes a total of four lamps: an A signal lamp 21 and a B signal lamp 22 disposed on a road extending in the left-right direction, and a C signal lamp 23 and a D signal lamp 24 disposed on a road extending in the vertical direction. It is composed of That is, the A signal lamp 21 and the B signal lamp 22 control the traffic flow in the horizontal direction in the figure, and the C signal lamp 23 and the D signal lamp 24 control the traffic volume in the vertical direction in the figure.

  As shown in FIG. 2, the A signal lamp 21 to the D signal lamp 24 are connected to the controller 50 by the signal wiring 30, receive power supply from the controller 50, and control signals for driving the lamp lighting. To get. The signal wiring 30 is composed of a control line 30a serving as a communication line for transmitting a control signal and a power supply line 30b for supplying power.

  The control line 30 a is connected in series from the controller 50 via each signal lamp 20. That is, the control line 30a extended from the controller 50 is arranged in a ring shape, and is first connected to the A signal lamp 21, and in series with the B signal lamp 22, the C signal lamp 23, and the D signal lamp 24. Are connected sequentially. Finally, the control line 30 a is connected from the D signal lamp 24 to the controller 50.

  The power supply line 30b extends from the controller 50 and is arranged in an annular shape, and is connected to the A signal lamp 21, the B signal lamp 22, the C signal lamp 23, and the D signal lamp 24 by wiring branched from the annular wiring. That is, electric power is supplied in parallel from the controller 50 to each signal lamp 20.

  The controller 50 includes a power conversion unit 51, a communication control unit 52, a control logic unit 53, and a power supply unit 54. The power conversion unit 51 converts the AC power acquired from the external power supply 90 into DC power, and supplies the DC power to the signal lamp device 20 through the power line 30b.

  The communication control unit 52 outputs a control signal for controlling lighting / extinction of the signal lamp 20 (A signal lamp 21 to D signal lamp 24) through the control line 30a. In addition, when a communication abnormality with the signal lamp 20 or a lamp abnormality is detected, the power conversion unit 51 stops the power supplied to the signal lamp 20.

  The control logic unit 53 records a lamp control code for controlling the signal lamp 20. That is, the communication control unit 52 acquires the lamp control code, which is a predetermined control pattern according to the driving time zone and the traffic flow state, from the control logic unit 53, and sends the lamp control code to the signal lamp 20. Send to. In addition, the communication control unit 52 compares the lamp display code transmitted from the signal lamp 20 with the transmitted lamp control code, and detects the occurrence of a failure. Specific contents of the lamp control code and lamp display code will be described later.

  The power supply unit 54 converts AC power acquired from the external power supply 90 into DC power and supplies the DC power to each component of the controller 50.

  Next, the configuration of the signal lamp 20 will be described with reference to FIG. The signal lamp 20 includes a G lamp 41, a Y lamp 42, and an R lamp 43, which are LED lamps. Although not shown here, an arrow lamp is provided as necessary. Further, the signal lamp 20 includes a G lamp switch 44, a Y lamp switch 45, and an R lamp switch 46 for driving the G lamp 41, the Y lamp 42, and the R lamp 43, respectively.

  Furthermore, the signal lamp device 20 includes a power supply unit 31, a communication / lamp drive control unit 32, and a failure detection unit 33. The power supply unit 31 adjusts the power acquired from the power supply line 30b to a predetermined voltage for LED driving and supplies the power to the G light switch 44, the Y light switch 45, and the R light switch 46.

  The communication / lamp drive control unit 32 outputs a control signal to the G lamp switch 44, the Y lamp switch 45, and the R lamp switch 46 based on the lamp control code acquired through the control line 30a. The communication / light drive control unit 32 controls to stop the power supply of the power supply unit 31 when a communication abnormality is detected or when a failure is detected by the failure detection unit 33 described below. Further, the communication / lamp drive control unit 32 transmits a signal lamp display code indicating the lighted content.

  The failure detection unit 33 includes a voltage detector 33a that detects a voltage supplied from the G light switch 44, the Y light switch 45, and the R light switch 46 to the G light 41, the Y light 42, and the R light 43, and detects a failure. To do. The detection result is notified to the communication / light drive control unit 32.

  Next, a communication method between the controller 50 and the signal lamp device 20 will be described. FIG. 4 shows a lamp control code transmitted from the controller 50 to the signal lamp 20 and a display control code transmitted from the signal lamp 20 to the controller 50. More specifically, as shown in the figure, the controller 50 transmits the A signal lamp control code, the B signal lamp control code, the C signal lamp control code, and the D signal lamp control code at predetermined intervals via the control line 30a. To the device 20. Each signal lamp 20 transmits a signal lamp display code indicating the content of actual display control to the controller 50 via the control line 30a after a certain period of time has elapsed after receiving the signal lamp display code.

  As a result, the control signal (logic code) superimposed on the control line 30a is, in order from the top, the A signal lamp control code and the A signal lamp display code, followed by the B signal lamp control code and the B signal lamp display code. , C signal lamp control code and C signal lamp display code, and further D signal lamp control code and D signal lamp display code. This transmission order logic code is cyclically superimposed on the control line 30a.

  FIG. 5 shows a configuration example of the logic code. FIG. 5A is an example of a signal lamp control code, and FIG. 5B is an example of a signal lamp display code. Here, as a representative example, the A signal lamp control code and the A signal lamp display code are illustrated, and the same applies to other signal lamp control codes and signal lamp display codes.

  The signal lamp control code includes a start code, an A signal lamp number, an A signal lamp control code, a check code, and a stop code. Furthermore, the A signal lamp control code is a G lamp code, a Y lamp code, an R lamp code, an arrow 1 code, an arrow 2 code, a Y lamp lamp code, an R lamp lamp code, an all lamp lamp code, and other information. Consists of code. Bit information is recorded corresponding to the light of each signal lamp 20. Specifically, the bit information in the case of lighting is “1”, and the bit information in the case of extinction is “0”. The lamp control code is similarly configured.

  The signal lamp 20 is given a unique identification number (ID), and the communication / lamp drive control unit 32 determines that the lamp number in the lamp control code matches the ID of the lamp. Is obtained, it is determined that the signal lamp control code is for its own use. The signal / lamp drive control unit 32 transmits the signal lamp control code with the mismatched signal lamp numbers to the signal lamp 20 connected next.

Next, the relationship between failure detection and control will be described.
<1> About Communication Failure Detection (a) The controller 50 determines that a communication failure has occurred under the following conditions.
• When a signal lamp number (ID) different from the signal lamp control code is detected.
・ When the lamp display code does not return for a certain period of time even after sending the signal lamp control code.
・ When the check code in the signal lamp display code is abnormal.
When the occurrence of a communication failure is detected, the communication control unit 52 of the controller 50 transmits a predetermined light extinction control code. Next, the communication control unit 52 acquires a display control code indicating the result of control based on the extinction lamp control code, and records the abnormality in a predetermined recording area when the control content is the same as the control content. The control is continued until the next lighting state is acquired. On the other hand, if the extinction lamp control is not accepted, that is, if the lamp display code does not return normally, the communication control unit 52 stops the power supply in the power conversion unit 51 and supplies power to the signal lamp unit 20. Stop.

(B) The signal lamp 20 determines that a communication failure has occurred in the following cases.
• When the check code in the signal lamp control code is abnormal.
・ When there is no signal lamp control code for a certain period of time.
When the occurrence of the communication failure is detected, the communication / lamp drive control unit 32 of the signal lamp 20 shifts the G lamp 41, the Y lamp 42, and the R lamp 43 to a predetermined extinction operation.

<2> Regarding Device Failure Detection (a) The controller 50 determines that a device failure has occurred under the following conditions.
-Signal lamp control code is not created or transmitted (monitoring that lamp control code is output at regular intervals).
-When a GG display is generated for a certain time or more with a plurality of signal lamps 20. In addition, GG display means the lighting combination of the G lamp 41 in which simultaneous lighting is not permitted at an intersection.
In the above case, the communication control unit 52 stops the power conversion unit 51 and stops power feeding.
(B) The signal lamp 20 determines that a device failure has occurred in the following cases.
-When there is an output to a plurality of signal lamps 20 due to a lamp switch failure (monitoring of lamp control output).
The communication / lamp drive control unit 32 stops the power supply and controls the G lamp 41, the Y lamp 42, and the R lamp 43 to be extinguished.

The main differences between the traffic signal control system 10 having the above configuration and the conventional system are summarized as follows.
(1) In the conventional system, the lighting / extinction control of the signal lamp is performed by turning on / off the AC power source directly from the controller. However, in the traffic signal control system 10 of the present embodiment, the power source for the signal lamp 20 is DC, and parallel power feeding is performed from the controller 50 (master unit).
(2) For the lighting and extinction of each signal lamp 20 that is supplied with power from the controller to the lamp by a plurality of cables, it is performed according to the communication instruction from the controller 50, and according to the instruction The power supply is turned on / off for each lamp (for each of the G lamp 41, the Y lamp 42, and the R lamp 43).
(3) Although the GG display for the main road and the sub-road was detected by the controller output, the display code of each signal lamp 20 was judged, the illegal GG display was detected, and the power supply was stopped. It was set as the structure to do.

As described above, according to the present embodiment, the present embodiment has the following features as a method related to signal control within an intersection.
(1) All the signal lamps 20 in the intersection can be controlled by a pair of power supply lines 30b and a pair of control lines 30a.
(2) An instruction from the controller 50 can be received by the control line 30a, and lighting and extinction control can be performed in the signal lamp device 20.
(3) By providing a failure detection function for a communication failure or a lamp control failure, it is possible to stop the power supply in the own signal lamp 20 or the controller 50 according to the content of the failure.
(4) In addition to independent control from the controller 50, remote control from a central device (central control center) (not shown) can also be performed.
(5) Since it is set as the structure which supplies direct-current power, it becomes easy to switch the electric power feeding from the power wire 30b into the electric power feeding from solar energy or a battery.
(6) The function of the controller 50 can be transferred to the signal lamp 20 by setting the master lamp. That is, it is possible to adopt a configuration in which the controller 50 is not provided.
(7) It is possible to reduce the amount of on-site construction and the number of routing cables.

  The present invention has been described based on the embodiments. This embodiment is an exemplification, and it will be understood by those skilled in the art that various modifications can be made to the combination of each component and processing process, and such modifications are also within the scope of the present invention.

DESCRIPTION OF SYMBOLS 10 Traffic signal control system 12 Intersection 20 Signal lamp 21 A signal lamp 22 B signal lamp 23 C signal lamp 24 D signal lamp 30 Signal wiring 30a Control line 30b Power supply line 31 Power supply part 32 Communication / light drive control part 33 Failure detection part 33a Voltage detector 41 G lamp 42 Y lamp 43 R lamp 44 G lamp switch 45 Y lamp switch 46 R lamp switch 50 Controller 51 Power conversion section 52 Communication control section 53 Control logic section 54 Power supply section 90 External power supply

Claims (3)

A traffic signal control system comprising n (n; natural number, n ≧ 2) signal lamps and a controller for controlling the n signal lamps,
A one-to-one connection from the controller to the first signal lamp, a one-to-one connection from the first signal lamp to the second signal lamp, and a one-to-one connection to the next signal lamp; A control signal that is connected to the controller in a one-to-one manner from the last n-th signal lamp device, is connected in series with the controller and the n signal lamp devices, and drives the lamp device of each signal lamp device from the controller. A control signal line through which
A power supply line that is wired in a ring from the controller, branches off from the ring wiring and supplies power to each of the n signal lamps;
The controller outputs a control signal including a lamp control code for controlling the lighting or extinction of the signal lamp to the control signal line, and acquires the control signal returned by transmitting the control signal line. A communication control unit
Each signal lamp receives the control signal from the control signal line, controls the driving of the lamp based on the lamp control code for itself from the received control signal, and the content of the lamp lighting A traffic signal control system comprising a communication / lamp drive control unit for outputting a lamp display code to the control signal line . The said control machine judges that it is a communication abnormality with the said signal lamp, when the said control signal is transmitted and the said lamp display code is not received within a predetermined time. Traffic signal control system. The communication control unit sequentially outputs the lamp control codes of the n signal lamps to the control signal line at a predetermined interval,
The communication / light drive control unit outputs the lamp display code after the lamp control code for itself,
When the communication control unit receives the control signal line and returns, the n signal lights are paired with the lamp control code for the same signal lamp after the lamp control code of the signal lamp. The traffic signal control system according to claim 1 or 2, wherein the lamp control code of the lamp is sequentially received.

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