JP4913199B2 - Traffic signal control system and failure determination method - Google Patents

Description

  The present invention relates to a traffic signal control system and the like.

  A traffic signal controlled by a traffic signal controller is installed at an intersection where a plurality of roads with different traveling directions intersect for safety and smooth traffic flow. The traffic signal control has a GG detection function for detecting that a plurality of traffic intersecting with each other simultaneously becomes a green signal (so-called GG abnormality). This GG detection function is realized by using a lamp color pickup circuit that detects the lighting state of each lamp color (especially a blue lamp) of the signal lamp.

  In general, in a signal lamp, each lamp color is turned on / off by turning on / off the supply of voltage (AC100V) to each LED of each lamp color by turning on / off an SSR (semiconductor relay). . The lamp color pickup circuit detects the presence or absence of voltage supply to the LED of each lamp color, and outputs the detection result as a lamp color pickup signal (see, for example, Patent Document 1).

JP 2001-34891 A

  By the way, if the lamp color pickup circuit fails, the lighting state of the corresponding lamp color cannot be detected, so that a situation in which GG detection is not performed despite the occurrence of GG abnormality may occur. That is, when the SSR corresponding to the blue light is short-circuited, the blue light is always “lit (abnormally lit)” regardless of the lighting / extinction command, but the lamp color pickup circuit is broken. Then, the “abnormal lighting” of this blue light is not detected. That is, GG detection is not performed in spite of the state where GG abnormality should be detected, which is a problem in terms of ensuring safe traffic. The present invention has been made in view of the above circumstances, and an object thereof is to detect an abnormality of a GG detection mechanism in a traffic signal control system and improve safety.

The first form for solving the above problem is
A traffic signal control system (for example, the traffic signal control system 1 of FIG. 1) for controlling lighting and extinction of a signal lamp (for example, the signal lamp 10 of FIG. 1),
Lamp driving means (for example, SSR 210 in FIG. 2) for lighting / extinguishing the signal lamp by applying an AC voltage to the signal lamp according to the lighting / extinction command;
Voltage detection means for detecting the voltage applied to the signal lamp (for example, the lamp color pickup circuit 230 in FIG. 2);
Lighting state determination means (for example, the abnormality determination unit 312 in FIG. 7) for determining the lighting state of the signal lamp device depending on whether or not the detected applied voltage is alternating current;
Drive failure determination means (for example, the abnormality determination unit 312 in FIG. 7) for determining a failure of the lamp driving means from the lighting / extinction command and the lighting state determined by the lighting state determination means;
Is a traffic signal control system.

As another form,
A failure determination method in a traffic signal control system comprising a lamp driving means for lighting / extinguishing the signal lamp by applying an AC voltage to the signal lamp according to a lighting / extinction command,
A lighting state determination step for determining a lighting state of the signal lamp device according to whether or not an applied voltage to the signal lamp device is alternating current,
A drive failure determination step of determining a failure of the lamp driving means from the lighting / extinction command and the determined lighting state;
A failure determination method including the above may be configured.

  According to the first embodiment, the applied voltage to the signal lamp is detected, the lighting state of the signal lamp is determined based on whether or not the detected applied voltage is alternating current, and the lighting / extinction command is issued. The failure of the lamp driving means is determined from the lighting state of the signal lamp determined to be.

  Since the signal lamp is turned on when an alternating voltage is applied, if the signal lamp is turned on, the applied voltage detected by the voltage detecting means is an alternating current. For this reason, the lighting state of the signal lamp can be determined depending on whether or not the detected applied voltage is alternating current.

  Further, when the lamp driving means fails, the signal lamp is turned on / off without following the lighting / extinguishing command according to the failure state. For this reason, when the lighting / extinguishing command and the determined lighting state of the signal lamp do not match, it can be determined that the lamp driving means is out of order. Specifically, when the signal lamp is “lit (abnormal lighting)” when the lighting / extinction command is a extinction command, or when the lighting / extinction command is a lighting command, (Abnormal light extinction) ”.

As a second form, the traffic signal control system of the first form,
First forced extinguishing means for forcibly extinguishing the signal lamp when the driving fault judging means determines that a fault has occurred (for example, the blue light extinguishing circuit 220 in FIG. 2);
A traffic signal control system may be configured.

  According to the second aspect, when it is determined that the lamp driving means for lighting / extinguishing the signal lamp is determined, the signal lamp is forcibly extinguished. If the lamp driving means breaks down, the signal lamp may be turned on even though the lighting / extinguishing command is the extinguishing command, which leads to the occurrence of GG abnormality. For this reason, in view of fail-safety, the occurrence of a GG abnormality can be prevented by forcibly extinguishing the signal lamp when it is determined that the lamp driving means has failed.

As a third form, the traffic signal control system of the first or second form,
With two voltage detection means of the same configuration,
Coincidence judging means for judging the coincidence of phases of applied voltages detected by the two voltage detecting means (for example, the abnormality judging unit 312 in FIG. 7),
Detection failure determination means (for example, the abnormality determination unit 312 in FIG. 7) for determining a failure of each of the two voltage detection means based on the determination result by the coincidence determination means;
A traffic signal control system may be configured.

  According to the third embodiment, the coincidence of the phases of the applied voltages detected by the two voltage detection units having the same configuration is determined, and the failure of each of the two voltage detection units is determined based on the determination result. Is done. Thus, the reliability of the detection of the lighting state of the signal lamp is enhanced by employing a dual system including two voltage detection means having the same configuration. That is, since the two voltage detection means have the same configuration, it can be determined that both are normal if the phases of the applied voltages detected by the two voltage detection means match each other. On the other hand, if the phases of the applied voltages detected by the two voltage detection means do not match, it can be determined that at least one of them has failed. Further, if the signal lamp is lit, the detected applied voltage is alternating current, and therefore it can be determined that at least the voltage detection means in which the detected applied voltage is alternating current is normal.

As a 4th form, it is the traffic signal control system of the 3rd form,
The lighting state determining means determines that the lighting is on when at least one of the applied voltages detected by the two voltage detecting means is alternating current,
A traffic signal control system may be configured.

  According to the fourth embodiment, when at least one of the applied voltages detected by the two voltage detecting means is AC, the lighting state of the signal lamp is determined to be lit.

As a fifth form, the traffic signal control system of the third or fourth form,
Second forced extinguishing means for forcibly extinguishing the signal lamp when the fault is judged by the detected fault judging means (for example, the blue light extinction circuit 220 in FIG. 2);
A traffic signal control system may be configured.

  According to the fifth aspect, the signal lamp is forcibly extinguished when it is determined that the voltage detection means for detecting the voltage applied to the signal lamp has failed. If the voltage detection means fails, the lighting state of the signal lamp cannot be detected. That is, there is a possibility that the abnormal lighting in which the signal lamp is turned on although the lighting / extinction command is the extinction command cannot be detected, which leads to the occurrence of a GG abnormality. For this reason, in view of fail-safety, the occurrence of a GG abnormality can be prevented by forcibly extinguishing the signal lamp when it is determined that the voltage detection means has failed.

Installation example of traffic signal control system. The internal block diagram of a lamp drive part. The circuit block diagram of a blue light cutting circuit. The signal waveform figure in a blue light cutting circuit. The circuit block diagram of a lamp color pick-up circuit. The signal waveform diagram in a lamp color pick-up circuit. The internal block diagram of a traffic signal controller. The data structural example of an abnormality determination table. The circuit block diagram of a coincidence determination circuit. The signal waveform diagram in a coincidence determination circuit.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following, an example of a traffic signal control system to which the present invention is applied will be described, but embodiments to which the present invention can be applied are not limited thereto.

[Constitution]
FIG. 1 is a diagram illustrating an installation example of the traffic signal control system 1 in the present embodiment. As shown in FIG. 1, the traffic signal control system 1 is installed and configured at each intersection, and a plurality (four in FIG. 1) of signal lamps 10 and a lamp drive unit (SSU) that drives each of the signal lamps 10. ) 20 and a traffic signal controller 30. Each of the lamp driver 20 and the traffic signal controller 30 can communicate with each other by, for example, SS (Spread Spectrum) radio, but may be wired by a cable or the like.

  The signal lamp 10 is for vehicles, and is attached above a pillar installed at a predetermined position of an intersection. The lamp drive unit 20 is attached in the vicinity of the signal lamp 10 to be driven. For example, it is attached adjacent to the signal lamp 10, is built in the signal lamp 10, or is mounted inside a pillar to which the signal lamp 10 is mounted.

  The traffic signal controller 30 is installed, for example, below or near any pillar to which the signal lamp 10 is attached, and controls the entire traffic signal at the intersection. Specifically, the traffic signal controller 30 transmits a lighting / extinguishing command for instructing lighting and extinguishing of each lamp color of the corresponding signal lamp 10 to each of the lamp driving units 20. The lamp drive unit 20 controls lighting and extinction of each lamp color of the signal lamp 10 to be driven in accordance with the lighting / extinguishing command received from the traffic signal controller 30.

  FIG. 1 shows a case in which four vehicle signal lamps 10 are installed for a cross intersection composed of four traffic roads. However, the shape of the intersection and the number of signal lamps 10 are the same. It is not restricted to this, Furthermore, you may decide to install the signal lamp for pedestrians.

  FIG. 2 is a block diagram showing an internal configuration of the lamp driving unit 20. As shown in FIG. 2, the lamp driving unit 20 includes an SSR (Solid State Relay) 210, a blue light cutting circuit 220, and a lamp color pickup circuit 230 (230A, 230B).

  The SSR 210 is provided for each color of the signal lamp 10, and is a semiconductor relay that turns on / off the supply of AC voltage (AC100V) to each color lamp by a commercial power source or the like in accordance with a lighting / extinguishing command from the traffic signal controller 30. It is.

  The blue light cut-off circuit 220 compulsorily supplies AC voltage (AC 100 V) from the commercial power supply or the like to the blue light of the signal light device 10 according to the blue light turn-off command from the traffic signal controller 30 regardless of the lighting / extinction light command. On / off.

  FIG. 3 is a diagram illustrating a circuit configuration example of the blue light cutting circuit 220. According to FIG. 3, the blue light cutting circuit 220 includes a D-FF 221, an amplifier 222, a BPF / rectifier 223, and a blue light cutting relay 224.

  A predetermined voltage Vc is applied to the data terminal D of the D-FF 221, a blue lamp turn-off command is input to the clock terminal CK, and a reset signal is input to the reset terminal R. The amplifier 222 amplifies the output signal Q1 of the D-FF 221. The BPF / rectifier 223 passes a signal in a predetermined band with respect to the output signal from the amplifier 222, cuts off a frequency component outside the band, and full-wave rectifies the passed signal.

  The blue light cutting relay 224 is a mechanical relay whose contact configuration is an a contact, and the contact 224 a is provided between the SSR 210 and the blue light 12. The blue light cutting relay 224 opens and closes the contact 224a according to an output signal from the BPF / rectifier 223.

  FIG. 4 is a diagram showing signal waveforms in the respective parts of the blue light cutting circuit 220. In FIG. 4, in order from the top, a blue light turn-off command input to the clock terminal CK of the D-FF 221, a reset signal input to the reset terminal R, an output signal from the output terminal Q 1, and a signal from the BPF of the BPF / rectifier 223 And the rectified signal, each signal waveform is shown.

  First, in the normal state where the blue lamp of the signal lamp 10 is allowed to turn on, as shown by the waveform in the left half (first half part) of FIG. Thus, the signal is a pulse signal whose phase is shifted by approximately a half cycle, and this signal is input to the clock terminal CK of the D-FF 221. An AC signal (square wave) synchronized with this pulse signal is output from the output terminal Q1 of the D-FF 221. When this output signal Q1 is supplied via the BPF / rectifier 223, the blue light cut-off relay 224 is raised, and an alternating voltage (AC 100V) is applied to the blue light 12.

  On the other hand, in the abnormal state in which the lighting of the blue light is not permitted, the blue cut command is a signal at a constant L level, as shown by the waveform in the right half (second half part) of FIG. 4. Therefore, the output signal of the D-FF 221 When Q becomes an L level signal, the signal supplied to the blue light relay 224 becomes a zero level signal, the blue light relay 224 falls, and the application of the AC voltage (AC 100 V) to the blue light 12 is turned off. The blue light 12 is extinguished.

  Returning to FIG. 2, the two lamp color pickup circuits 230A and 230B have the same configuration and a double configuration. The lamp color pickup circuits 230A and 230B respectively detect the lighting state (lighting / extinction) of the blue light of the signal lamp device 10, and output pickup signals A and B corresponding to the detected lighting state.

  FIG. 5 is a diagram illustrating a circuit configuration example of the lamp color pickup circuits 230A and 230B. According to FIG. 5, each of the lamp color pickup circuits 230A and 230B includes a photocoupler including a rectifier circuit 231 that is a bridge circuit, a constant voltage diode 232, a light emitting diode 233a that is a light emitting element, and a phototransistor 233b that is a light receiving element. 233.

  In the lamp color pick-up circuit 230, the AC voltage applied to the blue lamp 12 is divided by the resistors R1 to R3 connected in series, and further, full-wave rectified by the rectifier circuit 231 and applied to the light emitting diode 233a. Then, pulse signals generated by the switching operation of the phototransistor 233b are output as pickup signals A and B.

  FIG. 6 is a diagram showing signal waveforms in each part of the lamp color pickup circuits 230A and 230B. In FIG. 6, in order from the top, the lighting / extinction command for the SSR 210 corresponding to the blue lamp 12, the applied voltage to the blue lamp 12, the output signal from the rectifier circuit 231 and the lamp color pickup signal A output from the phototransistor 233b. , B.

  As shown in FIG. 6, when the lighting / extinction command to the blue light 12 is “lighting”, the SSR 210 corresponding to the blue light 12 is turned on (closed), and an AC voltage (AC 100 V) is applied to the blue light 12. Lights up. Then, the AC voltage applied to the blue lamp 12 is full-wave rectified by the rectifier circuit 231, further converted into a pulse signal via the photocoupler 233, and output as lamp color pickup signals A and B.

  When the lighting / extinction command for the blue lamp 12 is “extinction”, the SSR 210 corresponding to the blue lamp 12 is turned off (open), and the voltage applied to the blue lamp 12 is zero and the lamp is extinguished. Therefore, the output signal from the rectifier circuit 231 becomes a zero level, and the lamp color pickup signal becomes a constant zero level (L level) signal.

  That is, when the lamp color pickup circuits 230A and 230B are both “normal (not faulty)”, the lamp color pickup signals A and B have the same signal waveform. The lamp color pickup signals A and B are AC signals (pulse signals) when the blue lamp 12 is “lit”, and are constant at the zero level (L level) when the lamp is “off”. On the other hand, when the lamp color pickup circuits 230A and 230B are out of order, the corresponding pickup signals A and B are not AC signals regardless of the lighting / extinguishing command.

  FIG. 7 is a block diagram showing a functional configuration of the traffic signal controller 30. According to FIG. 7, the traffic signal controller 30 functionally includes a processing unit 310, a storage unit 320, and a communication unit 330.

  The processing unit 310 is realized by a CPU, for example, and performs overall control of the traffic signal controller 30. Further, the processing unit 310 includes a lighting / extinction lamp command generation unit 311, an abnormality determination unit 312, a GG detection unit 313, and a blue light turn-off command generation unit 314, and the target intersection according to the traffic signal control program 321. Control traffic signals.

  The lighting / extinguishing command generation unit 311 generates a lighting / extinguishing command that designates lighting and extinction of each lamp color of the corresponding signal lamp 10 for each of the lamp driving units 20. This lighting / extinguishing command is generated so as to realize a predetermined display ladder at the intersection to be controlled.

  The abnormality determination unit 312 refers to the abnormality determination table 322 based on the lighting / extinguishing command generated by the lighting / extinguishing command generation unit 311 and the lamp color pickup signals A and B input from the lamp color pickup circuit 230. Then, it is determined whether or not there is an abnormality (failure) in the SSR 210 and the lamp color pickup circuit 230 in the lamp driving unit 20.

  Here, the type of failure to be determined and the determination principle will be described. First, regarding the failure of the SSR 210, there are a “short failure” that is “on (short)” and an “open failure” that is “off (open)”. “Short failure” results in “abnormal lighting” in which the corresponding lamp color is always lit, and “open failure” results in “abnormal lighting” in which the corresponding lamp color is always extinguished.

  Therefore, the abnormality of the SSR 210 corresponding to the blue light can be determined from the lighting / extinction command to the blue light and its lighting state. That is, if the lighting state of the blue lamp is “lit” when the lighting / dark lamp command for the blue lamp is “lit”, the SSR 210 corresponding to the blue lamp can be determined to be faulty (open), and If the lighting state is “lit” when the command is “light-off”, the SSR 210 corresponding to the blue light can be determined to be faulty (closed). The lighting state of the blue lamp is determined from the lamp color pickup signals A and B.

  Further, as described above, when the lamp pickup circuits 230A and 230B are both “normal”, the Bick-up signals A and B coincide with each other, and the blue lamps “light” when the pickup signals A and B match. If it is turned on, it becomes an AC signal, and if it is turned off, it becomes a signal with a constant zero level (L level). When the lamp color pickup circuits 230A and 230B are “failed”, the corresponding pickup signals A and B are not AC signals but are signals of a predetermined level (H or L level).

  Therefore, if the lamp color pickup signals A and B match, both the lamp color pickup circuits 230A and 230B can be determined to be “normal”. Further, at this time, if the pickup signals A and B are both AC signals, the lighting state of the blue lamp can be determined to be “lit”, and if the signal is a zero level (L level), the lighting state can be determined to be “dark”.

  On the other hand, if the lamp color pickup signals A and B do not match, it can be determined that at least one of the lamp color pickup circuits 230A and 230B is “abnormal (failure occurs)”. At this time, if one of the pickup signals A and B is an AC signal, the lamp color pickup circuit 230 corresponding to the AC signal is “normal” and the other lamp color pickup circuit 230 is “abnormal”. And the lighting state of the blue light can be determined as “lit”. Based on such a determination principle, the abnormality determination table 322 is determined.

  FIG. 8 is a diagram illustrating an example of a data configuration of the abnormality determination table 322. According to FIG. 8, the abnormality determination table 322 stores the abnormality determination result in association with each combination of the lamp color pickup signal 322a and the blue lamp lighting / extinguishing command 322b.

  That is, if the lighting / extinction command to the blue lamp is “lighting” and the lamp color pickup signals A and B are both AC, the blue lamp is “lit”, and the SSR 210 and the lamp color pickup circuit 230 Are both determined to be “normal”.

  If the lighting / extinction command for the blue light is “lighting” and one of the light color pickup signals A and B is an AC signal, the blue light is “lighting” and the light color pickup Of the circuits 230A and 230B, the lamp pickup circuit 230 whose pickup signal is not an AC signal is determined to be “abnormal”.

  Also, if the lighting / extinction command to the blue lamp is “lighting” and the lamp color pickup signals A and B are both signals at a constant L level, the blue lamp is “abnormally extinguished” and blue The SSR 210 corresponding to the lamp is determined to be “abnormal (open)” and the lamp color pickup circuits 230A and 230B are determined to be “normal”.

  If the lighting / extinction command for the blue lamp is “extinction” and the lamp color pickup signals A and B are both alternating current, the blue lamp is “abnormally lit” and corresponds to the blue lamp. The SSR 210 is determined to be “abnormal (short)”, and the lamp pickup circuits 230A and 230B are determined to be “normal”.

  If the lighting / extinction command for the blue lamp is “extinction” and one of the lamp color pickup signals A and B is an AC signal, the blue lamp is “abnormally lit” and the blue lamp SSR 210 is determined to be “abnormal (short)”, and the lamp pickup circuit 230 whose lamp pickup signal is not an AC signal is determined to be “failure”.

  In addition, if the lighting / extinction command for the blue lamp is “extinction” and the lamp color pickup signals A and B are both signals at a constant L level (zero level), the blue lamp is “extinguished”. Both the SSR 210 corresponding to the blue light and the light color pickup circuit 230 are determined to be “normal”.

  Note that the coincidence of the lamp color pickup signals A and B in the abnormality determination unit 312 may be determined by software by digital signal processing, or for example, a determination circuit illustrated in FIG. 9 may be used.

  FIG. 9 is a diagram illustrating an example of a circuit configuration of the coincidence determination circuit 340 that determines whether the lamp color pickup signals A and B coincide with each other. According to FIG. 9, the coincidence determination circuit 340 includes D-FFs 341a and 341b, delay circuits 342a and 342b, and an EXOR gate 343 that are connected in series to form a shift register.

  The output signal Q2 of the subsequent D-FF 341b is input to the data terminal D of the D-FF 341a via the delay circuit 342b, and the lamp color pickup signal A is input to the clock terminal CK. The output signal Q1 of the preceding D-FF 341a is input to the data terminal D of the D-FF 341b via the delay circuit 342a, and the lamp pickup signal B is input to the clock terminal CK2. A common initialization pulse is input to the set terminal P of the D-FF 341a and the reset terminal R of the D-FF 341b. The delay circuits 342a and 342b are configured to guarantee a time error Tw in which the delay times are regarded as the phases of the pickup signals A and B being in agreement.

  The EXOR gate 343 receives the inverted output signals Q1 and Q2 of the D-FFs 341a and 341b, respectively.

  FIG. 10 is a diagram showing signal waveforms in each part of the coincidence determination circuit 340. In FIG. 10, the initialization pulse, the lamp color pickup signals A and B, and the output signals Q1 and Q2 of the D-FFs 341a and 341b are shown in order from the top.

  According to FIG. 10, a pulse signal synchronized with the change timing of the lighting / extinguishing command is input to the D-FFs 341a and 341b as an initialization pulse. At the input timing of this initialization pulse, the output signal Q1 of the D-FF 341a is set to “1”, and the output signal Q2 of the D-FF 341b is reset to “0”. The D-FF 341a takes in the output signal Q2 of the D-FF 341b that has passed through the delay circuit 342b at the rising timing of the lamp color pickup signal A and outputs it as an output signal Q1, and the D-FF 341b outputs the lamp color pickup signal B The output signal Q1 of the D-FF 341a that has passed through the delay circuit 342a is taken in and output as an output signal Q2.

  Accordingly, since the output signals Q1 and Q2 are initialized to values that do not coincide with each other by the initialization pulse, if the phases of the lamp color pickup signals A and B substantially match, the output signals Q1 and Q2 are The signals A and B are inverted almost simultaneously at the rising timing. That is, the output signals Q1 and Q2 do not match, and the output of the EXOR gate 343 is “1”.

  However, if the lamp color pickup signals A and B do not match, the output signals Q1 and Q2 match, and the output of the EXOR gate 343 becomes “0”. For example, in FIG. 10, at the timing t1, the phase of the lamp color pickup signal B is delayed and the lamp color pickup signals A and B do not match. At this timing t1, the output signal Q1 of the D-FF 341a is inverted, but since the output signal Q1 is not captured in the D-FF 341b, the output signal Q2 does not change. For this reason, the output signals Q1 and Q2 are both “0” and coincide with each other, and the output of the EXOR gate 343 changes to “0”.

  Once the output signals Q1 and Q2 match, the output signals Q1 and Q2 remain unchanged and the output of the EXOR gate 343 is "0" even if the phases of the lamp color pickup signals A and B match again. "".

  Returning to FIG. 7, the GG detection unit 313 determines that the traffic roads intersecting each other simultaneously with the green light based on the lighting state of the blue light of each signal lamp 10 determined by the abnormality determination unit 312 of each lamp driving unit 20. The presence or absence of occurrence of GG abnormality is detected.

  When the abnormality determination unit 312 determines that the SSR 210 or the lamp color pickup circuit 230 is abnormal, or when the GG detection unit 313 detects GG, the blue lamp turn-off command generation unit 314 outputs The blue lamp turn-off command to be output is set to a zero level (L level) constant signal, so that the blue lamp of the signal lamp device 10 is forcibly extinguished.

  The storage unit 320 is implemented by, for example, an IC memory or a hard disk, and stores a system program for causing the processing unit 310 to control the traffic signal controller 30 in an integrated manner, a program and data for realizing various functions, and the like. At the same time, it is used as a work area of the processing unit 310. In the present embodiment, a traffic signal control program 321 is stored as a program, and an abnormality determination table 322 is stored as data.

  The communication unit 330 is a wireless communication device that performs SS wireless communication, for example, and controls wireless communication with an external device (mainly, the lamp driving unit 20).

[Action / Effect]
As described above, in the traffic signal control system 1 of the present embodiment, the lamp color pickup circuit 230 in the lamp drive unit 20 is configured in a double system, and when the blue light to be detected is turned on, the lamp color pickup circuit 230 The lamp color pickup signal is configured to be an AC signal. That is, the presence or absence of failure of each of the lamp color pickup circuits 230A and 230B can be determined based on whether or not the lamp color pickup signals A and B by the two lamp color pickup circuits 230A and 230B match. Thereby, the reliability of the lamp color pickup circuit 230 is improved. Further, the lighting state (lighting / extinguishing) of the blue light can be determined depending on whether or not the lamp color pickup signals A and B are AC signals.

  Further, the abnormality of the SSR 210 corresponding to the blue light can be determined from the lighting / extinction command made and the lighting state of the blue light determined. That is, if the lighting state of the blue light is “lighted” when the lighting / lighting command for the blue light is “lighting”, the SSR 210 corresponding to the blue light can be determined to be faulty (open), and “lighting off” If the lighting state is “lit” at the time, the SSR 210 corresponding to the blue light can be determined to be faulty (closed). Thereby, in particular, it is possible to detect a case where a short failure of the SSR 210 corresponding to the blue light and a failure of the light color pickup circuit 230 occur at the same time. That is, the possibility of GG abnormality can be detected reliably, and safety can be improved.

[Modification]
It should be noted that embodiments to which the present invention can be applied are not limited to the above-described embodiments, and can be appropriately changed without departing from the spirit of the present invention.

(A) Abnormality determination For example, the abnormality determination performed by the traffic signal controller 30 may be performed by the lamp driving unit 20. That is, the lamp drive unit 20 has the function of the abnormality determination unit 312 that the traffic signal controller 30 has.

(B) Object of abnormality determination Further, in the above-described embodiment, the failure detection of the SSR 210 corresponding to the blue light and the lamp color pickup circuit 230 that detects the lighting state of the blue light is described for the blue light of the signal lamp 10. However, the present invention can be similarly applied to other color lights (a red light and a yellow light).

(C) Notification of abnormality determination result Further, the determination result by the abnormality determination unit 312 may be notified. Specifically, when the abnormality determination unit 312 determines that the SSR 210 or the lamp color pickup circuit 230 is abnormal, or when the GG detection unit 313 detects a GG abnormality, the content of the abnormality that has occurred is notified. As a notification method, a predetermined error code is displayed on a display device provided in the traffic signal controller 30, or a predetermined notification signal is transmitted to a host system such as a traffic control center connected to the traffic signal controller 30. Or let me know.

DESCRIPTION OF SYMBOLS 1 Traffic signal control system 10 Signal lamp 20 Lamp drive part 210 SSR, 220 Blue light cutting circuit 230 (230A, 230B) Light color pick-up circuit 30 Traffic signal controller 310 Processing part 311 Lighting / extinction command generation part, 312 Abnormality Determination unit 313 GG detection unit, 314 Blue light turn-off command generation unit 320 Storage unit 321 Traffic signal control program, 322 Abnormality determination table 330 Communication unit

Claims (5)

A traffic signal control system for controlling lighting and extinction of a signal lamp,
Lamp driving means for lighting / extinguishing the signal lamp by applying an AC voltage to the signal lamp according to the lighting / extinction command;
As a signal based on the applied voltage to the signal lamp, when the applied voltage is the AC voltage, a pulse signal corresponding to the applied voltage is output, and when the applied voltage is other than the AC voltage, a constant level signal is output. First and second voltage detecting means having the same circuit configuration ;
A first binary signal whose inversion timing is controlled based on a pulse signal from the first voltage detection means is generated, and a second binary signal whose inversion timing is controlled based on the pulse signal from the second voltage detection means Determination means for generating a signal and determining the difference between the first binary signal and the second binary signal;
A failure determination unit that determines a failure of each of the first and second voltage detection units using a determination result of the determination unit;
A lighting state determination unit that determines a lighting state of the signal lamp device according to whether a pulse signal is output from the first and second voltage detection units;
Drive failure determination means for determining a failure of the lamp driving means from the lighting / extinction command and the lighting state determined by the lighting state determination means;
A traffic signal control system comprising: First forced light extinguishing means for forcibly extinguishing the signal lamp when the drive fault judging means determines that a fault has occurred;
The traffic signal control system according to claim 1. The lighting state determination means determines that the light is on when at least one of the pulse signals from the first and second voltage detection means is alternating current,
The traffic signal control system according to claim 1 or 2 . A second forcible extinguishing means for forcibly extinguishing the signal lamp when the detected fault judging means judges that a fault has occurred;
The traffic signal control system according to any one of claims 1 to 3 . By applying an AC voltage to the signal lamp according to the lighting / extinction command, a lamp driving means for lighting / extinguishing the signal lamp, and a signal based on the voltage applied to the signal lamp, the applied voltage is the AC A traffic having first and second voltage detection means having the same circuit configuration for outputting a pulse signal corresponding to the applied voltage in the case of a voltage and outputting a signal of a constant level in cases other than the AC voltage. A failure determination method in a signal control system,
A first binary signal whose inversion timing is controlled based on a pulse signal from the first voltage detection means is generated, and a second binary signal whose inversion timing is controlled based on the pulse signal from the second voltage detection means A determination step of generating a signal and determining the difference between the first binary signal and the second binary signal;
A failure determination step of determining a failure of each of the first and second voltage detection means using a determination result in the determination step;
A lighting state determination step of determining a lighting state of the signal lamp device according to whether or not a pulse signal is output from the first and second voltage detection units;
A drive failure determination step of determining a failure of the lamp driving means from the lighting / extinction command and the determined lighting state;
A failure determination method including:

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