JP2009193459A - Traffic signal controller - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a duplicate traffic signal controller switching to a standby control system quickly and continuously controlling traffic signals when an abnormal state of a traffic light is detected. <P>SOLUTION: The traffic signal controller 100 is provided with a primary traffic signal controller for controlling a signal and a standby traffic signal controller with the same structure as the primary traffic signal controller to be used when the primary traffic signal controller fails. The primary traffic signal controller has: a phase data storage part for storing phase data; a control unit for controlling lighting of the signal; a lamp control unit for lighting each lamp of the signal; an abnormal state storage part for storing combinations of abnormal lighting state of the signal; and a failure detection part for giving an instruction to use the standby traffic signal controller when the lighting state is determined to be abnormal. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a duplexed traffic signal controller that can quickly switch to a standby control system and continuously control traffic signals when erroneous lighting of traffic signal lights is detected.

  A conventional signal controller having a function of detecting an erroneous lighting of a traffic light is preset with a lighting combination (GG abnormal state) of a blue light that is not allowed to be simultaneously turned on at an intersection, and matches the combination. When the lamp lighting signal is transmitted, it is detected as an abnormal display to prevent simultaneous lighting of the blue lamp (see, for example, Patent Document 1).

In this way, when the GG abnormal state occurs, control is normally performed so as to perform an abnormal flash operation such that the main road side blinks with a yellow lamp and the secondary road side blinks with a red lamp. . The signal controller is centrally managed by a central monitoring device, etc. When the central monitoring device detects a signal that causes flashing abnormal operation, a maintenance staff is sent to the site to investigate the cause and repair. .
Japanese Patent No. 3296429

  However, there is a problem in that the traffic in the vicinity is congested because the police have to guide traffic by a hand flag signal or the like until the cause and repair of the traffic light failure.

  The present invention has been made to solve the above-described problems, and when a traffic signal light is erroneously turned on, the traffic signal can be continuously switched to a standby control system to continuously control the traffic signal. An object is to provide a traffic signal controller.

  In order to solve the above problems, the features of the present invention are: (a) a main traffic signal controller that controls a traffic light and a main traffic signal controller used when the main traffic signal controller becomes abnormal; A standby traffic signal controller of the same structure is provided, and the main traffic signal controller stores the display data for turning on the traffic signal to be controlled, and (b) stores it in the display storage unit. The control unit that controls to turn on the signal of the traffic light based on the read display data, and (c) turns on each lamp of the traffic light according to the control signal from the control unit Read the combination table from the lamp control unit, (d) the abnormal state storage unit that stores the abnormal lighting state combination table, and (e) the abnormal state storage unit, and in the abnormal lighting state described in the combination table If it is determined that there is a standby traffic signal control And (f) the lamp control unit transmits the result of lighting each lamp to the abnormality detection unit, and (g) the abnormality detection unit is in an abnormal state. The gist of the present invention is a traffic signal controller that compares the combination table stored in the storage unit with the received lighting result and determines that the lighting state is an abnormal combination.

  According to the traffic signal controller of the present invention, when the traffic signal lamp is erroneously turned on, it is possible to quickly switch to the standby control system and continuously control the traffic signal normally.

  Since a control unit and an abnormality detection unit are provided separately, the abnormality detection unit detects the appropriateness of the operation of the control unit and other units, and when an abnormality is detected, it switches to a standby system and continuously controls traffic signals. Even if a failure or the like occurs in the control unit, it is possible to always perform normal control without causing the traffic light to be in an abnormal flash state.

  Next, embodiments of the present invention will be described with reference to the drawings. In the following description of the drawings, the same or similar parts are denoted by the same or similar reference numerals. However, it should be noted that the drawings are schematic.

  First, a traffic signal controller that is normally used will be briefly described. At intersections where roads with different traveling directions intersect, a traffic signal controlled by a traffic signal controller is installed to ensure traffic safety and smooth traffic flow. Usually, these traffic lights are provided with blue (G), yellow (Y), and red (R) signal lamps, and the display method of these signal lamps (hereinafter referred to as current indication) Each traffic signal controller has display data suitable for each traffic situation because it varies depending on the traffic situation.

  An example of an intersection is shown in FIG. In FIG. 1, a road 61 in which the vehicle travels in the left-right direction (here, referred to as “one direction”) and a road 62 in which the vehicle travels in the vertical direction (here, referred to as “two directions”). And intersect. The traffic light installed at this intersection includes a blue light 1G for vehicles in one direction, a yellow light 1Y for vehicles in one direction, a red light 1R for vehicles in one direction, and two directions from one direction. There is an arrow lamp 1A for turning right (A), a two-way vehicle blue lamp 2G, a two-way yellow lamp 2Y, and a two-way vehicle red lamp 2R.

  The intersection has a pedestrian crossing 63 for pedestrians in two directions and a pedestrian crossing 64 for pedestrians in one direction. There are a two-way crossing red light device 2PR, a one-way crossing blue light device 1PG, and a one-way crossing red light device 1PR. In addition, the broken line drawn in the center part of the road in FIG. The traffic signal controller 100 according to the embodiment of the present invention is used to control the lamps of each traffic signal at an intersection as shown in FIG.

(Traffic signal controller)
As shown in FIG. 2, the traffic signal controller 100 according to the embodiment of the present invention includes a CPU 11, a current storage unit 12, a control unit 13, an abnormality detection unit 14, and an abnormal state storage as a main traffic signal controller. And a CPU 21, a display storage unit 22, a control unit 23, an abnormality detection unit 24, and an abnormal state storage unit 25 as a standby traffic signal controller. In addition, a relay unit 16, a lamp control unit 17, a vehicle traffic signal 18, a pedestrian traffic signal 19 and the like are provided.

  The display storage unit 12 stores a plurality of types of display data for designating a pattern for lighting each lamp of each traffic light. One display data has, for example, a memory arrangement as shown in FIG. 4, and lighting data (lighting) of pedestrian lamps (blue, red), vehicle lamps (blue, yellow, red), and vehicle arrow lamps. , A lighting pattern composed of a bit string of a digital value indicating turn-off or blinking) is stored.

  In addition, bit data for each floor number of the lighting pattern is arranged for each address. For example, in the case of the state of the floor number 1, data is stored in which the vehicle blue light 1G is turned on and the pedestrian blue light 1P is turned on. With the passage of time, the floor number changes from floor number 1 to floor number 2, and the address arrangement also changes each time.

  The CPU 11 manages the entire traffic signal controller 100 in cooperation with the control unit 13 and always synchronizes with the standby CPU 21. Further, it decides which display data is to be used among a plurality of types of display data in the display storage unit 12. In the display storage unit 12, only display data designated by the CPU 11 can be read.

  The control unit 13 reads the display data stored in the display storage unit 12, and based on the read display data, the vehicle traffic light 18 lights the G, Y, and R signals, and the pedestrian traffic light 19 Control is performed so that the PG and PR signals are turned on.

  The abnormality detection unit 14 monitors the driving state of the lamp by the lamp control unit 17. When the lighting state of the abnormal combination is received from the lamp control unit 17 during monitoring, the relay unit 16 is notified. As an abnormal combination, there is a GG abnormality or the like, but these are stored in advance in the abnormal state storage unit 15 as an abnormal state matrix as shown in FIG. In the abnormal state matrix, for all combinations of signal lamps corresponding to GG abnormalities, those that can be turned on simultaneously with each lamp combination (circles in the figure) and those that are impossible (in the figure) X mark).

  An example of the internal configuration of the abnormality display detection unit 14 is shown in FIG. The abnormality detection unit 14 branches the power supply line from the power supply 71, inverts the signal on the input side of the AND circuit (NAND circuit) 74 via the resistors 72 and 73, and then performs an AND operation on the input signal. The configuration for outputting the results and the pick-up signals (1PG and 1G in the same direction (one direction) for which the blue lamps can be turned on simultaneously) (see FIG. 1; the same applies hereinafter) via inverters 75 and 76, respectively. The resistor 72 and the NAND circuit 74 are connected via diodes 80 and 81, respectively.

  Further, the pick-up signals (1A, 2PG, and 2G) of the lamp in the same direction (two directions) in which simultaneous lighting of the blue lamp is permitted are connected between the resistor 73 and the NAND circuit 74 via the inverters 77 to 79, respectively. Are connected via diodes 82 to 84, respectively.

  When blue lamps in different directions (one direction and two directions) are turned on simultaneously, for example, when 1 PG and 2 PG are turned on simultaneously, the pickup signal of 1 PG is set to “L (low)” by the inverter 75. Then, one input side of the NAND circuit 74 becomes “L (low)” via the diode 80.

  On the other input side of the NAND circuit 74, when the 2PG pickup signal becomes “L (low)” by the inverter 78, the other input side of the NAND circuit 74 becomes “L (low)” via the diode 83. Therefore, “L (low)” as a result of the logical product is output from the output side of the NAND circuit 74, and a GG abnormality is detected.

  When receiving the notification that the abnormal lighting state is detected from the abnormality detection unit 14, the relay unit 16 instructs the CPU 11 to stop and the CPU 21 to start. That is, the main traffic signal controller is switched to the standby traffic signal controller.

  In response to the control signal from the control unit 13, the lamp control unit 17 turns on the lamps of the vehicle traffic light 18 and the pedestrian traffic light 19 and notifies the abnormality detection unit 14 of the lighting state. For example, since each lamp uses a voltage of 100 V AC or the like in the lighting state, the lamp control unit 17 transmits a signal for applying this voltage to each lamp. It is determined whether the light is off, and the determination result is notified to the abnormality detection unit 14.

  In addition, the CPU 21, the display storage unit 22, the control unit 23, the abnormality detection unit 24, and the abnormal state storage unit 25 are the CPU 11, the display storage unit 12, Since it is the same as the unit 13, the abnormality detection unit 14, and the abnormal state storage unit 15, the description thereof is omitted.

(Operation of traffic signal controller)
The operation of each device of the traffic signal controller 100 will be described below with reference to the flowchart in FIG. 7 and the timing chart in FIG.

(A) First, in step S101, the control unit 13 of the main traffic signal controller reads the present data from the present storage unit 12. For example, when the control unit 13 reads the floor number 1 in FIG. 3, the bit data of a pattern that lights the pedestrian blue light (1PG), the vehicle blue light (1G), etc. is transmitted to the light control unit 17. To do. It is assumed that the display data changes with the floor numbers (floor numbers (1) to (4)) as shown in FIG.

(B) In step S102, the lamp control unit 17 receives the lighting pattern bit data transmitted from the control unit 13, and transmits a voltage application signal for lighting each lamp of each traffic light along the bit data. . In step S <b> 103, the lamp control unit 17 receives the lighting state (lighting / flashing / extinguishing etc.) of each lamp of each traffic light and transmits it to the abnormality detection unit 14.

(C) In step S104, the abnormality detection unit 14 that has received the lighting state of each lamp of each traffic light is compared with the abnormal state matrix stored in the abnormal state storage unit 15, and no abnormal lighting state has occurred. Is checked (S105). If an abnormal lighting state has occurred, the process proceeds to step S106. If an abnormal lighting state has not occurred, the process returns to step S101 to read the present data of the next step, and the operations in steps S102 to S105 are repeated. .

(D) If an abnormal state has occurred in step S106 (see FIG. 8C), the abnormality detection unit 14 notifies the relay unit 16 of this (see FIG. 8D), and the relay unit 16 The CPU 11 is stopped (see FIG. 8B), and the CPU 21 is instructed to be activated (see FIG. 8E). As a result, the main traffic signal controller stops and the standby traffic signal controller operates. In step S107, the CPU 21 synchronized with the CPU 11 operates the control unit 23 immediately after switching of the relay unit 16 (see FIG. 8F).

  According to the traffic signal controller according to the embodiment of the present invention, the control unit 13 and the abnormality detection unit 14 are provided separately, and the abnormality detection unit 14 detects whether the operation of the control unit 13 and other units is appropriate. When the traffic signal is detected, the traffic signal is continuously controlled by switching to the standby system, so that the traffic light can always be lit normally without being in an abnormal flash state.

It is a figure which shows the example of arrangement | positioning of the traffic signal in an intersection. It is a block diagram which shows the internal structure of the traffic signal controller which concerns on embodiment of this invention. It is a figure which shows the lighting state of a traffic light. It is a data figure which shows the internal data structure of a present memory | storage part. It is a matrix figure which shows an example of an abnormality detection part. It is an internal structure figure of an example of an abnormality detection part. It is a flowchart which shows operation | movement of a traffic signal controller. It is a timing chart figure which shows operation | movement of a traffic signal controller.

Explanation of symbols

11,21 ... CPU
DESCRIPTION OF SYMBOLS 12, 22 ... Present storage part 13, 23 ... Control part 14, 24 ... Abnormality detection part 15, 25 ... Abnormal state storage part 16 ... Relay part 17 ... Lamp control part 18 ... Traffic light for vehicles 19 ... Traffic light for pedestrians 100 ... Traffic signal controller

Claims (1)

A main traffic signal controller for controlling a traffic light, and a standby traffic signal controller having the same structure as the main traffic signal controller used when the main traffic signal controller becomes abnormal, the main system Traffic signal controller
A display storage unit for storing display data for lighting the signal to be controlled;
A control unit for reading the display data stored in the display storage unit and controlling the signal lights of the traffic lights based on the read display data;
According to a control signal from the control unit, a lamp control unit for lighting each lamp of the traffic light,
An abnormal state storage unit for storing a combination table of abnormal lighting states of the traffic lights;
When the combination table is read from the abnormal state storage unit and determined to be in an abnormal lighting state described in the combination table, an abnormality detection unit that instructs to use the standby traffic signal controller ,
The lamp control unit transmits the result of lighting each lamp to the abnormality detection unit,
The abnormality detection unit compares the combination table stored in the abnormal state storage unit with the received lighting result, and determines the lighting state of the abnormal combination. .

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