JP2007015645A - Detecting device for train passage at railroad crossing - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a detecting device for train passage at a railroad crossing, capable of promptly detecting that a tail end of a train finishes passing through a railroad cross. <P>SOLUTION: This detecting device for train passage at the railroad crossing is provided with a single noncontact sensor 1 arranged along a rail 3 and detecting an object passing in front of the noncontact sensor 1 and with a self-diagnosis means determining train passage at the railroad crossing based on an output state of the noncontact sensor 1 and an end point condition. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a railroad crossing train passage detection device used in railroad crossing safety equipment and the like.

Conventionally, an open-circuit type railroad crossing controller installed at the alarm end point has been used for railroad crossing train passage detection. Does the railroad crossing controller have a train in a predetermined section centered on the installation point? Whether or not is detected (Patent Document 1).
Japanese Patent No. 2613582

  In the case of the above-mentioned prior art, since a slow motion characteristic is provided to prevent malfunction due to chattering of the railroad crossing controller relay contact, it takes time until the railroad crossing breaker opens after the end of the train passes the railroad crossing. It was.

(Object of invention)
An object of the present invention is to provide a railroad crossing train passage detection device that can quickly detect that the end of a train has passed through a railroad crossing.

  In order to achieve the above object, the present invention provides a railroad crossing train that includes a single non-contact sensor that is installed along a rail and detects an object passing in front, an output state of the non-contact sensor, and a stop point condition. A railroad crossing train passage detection device having self-diagnosis means for determining passage is provided.

  According to the present invention, it is possible to quickly detect the end of the train passing through the railroad crossing.

  The best mode for carrying out the present invention is as described in Examples described later.

  FIG. 1 is a plan view and a side view showing an installed state of a railroad crossing detection apparatus according to an embodiment of the present invention, and FIG. 2 is a circuit block diagram of the railroad crossing detection apparatus according to an embodiment of the present invention. is there.

  1 and 2, a single non-contact sensor 1 such as an ultrasonic sensor, an optical sensor, or a magnetic sensor is located at a point slightly past the railroad crossing road 2 in the traveling direction of the train by the support 4 along the rail 3. It is installed at a predetermined height (for example, 2500 mm) above the ground, and outputs a high level signal when an object passing through the front, that is, a train is detected. FIG. 1 shows a state in which the rearmost train 5 passes in front of the non-contact sensor 1. A control box 6 is fixed to the column 4. Inside the control box 6, as shown in FIG. 2, the photocoupler input circuit 7 to which the signal from the non-contact sensor 1 is inputted, and the output signal of the photocoupler input circuit 7 is finely interrupted (for example, the off time is 200). (1800 ms) as a continuous signal, a logic circuit 9 for determining whether a train crossing, entering / exiting, failure of the non-contact sensor 1 or the like is performed according to the logic of the output signal of the non-contact sensor 1. Non-volatile self-diagnostic memory 10 that records the determination of the output, and an output circuit 15 that selectively or simultaneously operates the passage R11 (R is a relay), the entry R12, the entry R13, and the failure R14 according to the determination of the logic circuit 9. Is provided. Further, an alarm end point condition (relay localization contact 16) is input to the photocoupler input circuit 7. Reference numeral 17 denotes a railroad crossing train passage detection device.

  The logic circuit 9 is composed of all hardware by a general-purpose logic IC. This is to provide a fail-safe function at a low cost. The passage R11 is a relay that notifies that the last 5 of the train has passed the railroad crossing 2. The approach R12 is a relay that informs that the train has entered, the advance R13 is a relay that informs that the train has entered, and the failure R14 is a relay that informs of the failure of the non-contact sensor 1.

  An example of logical operation of the logic circuit 9 will be described below.

  First, when the train enters the control section of the alarm end point condition, the localization relay contact 16 is turned on. Then, after the non-contact sensor 1 detects the train and outputs a high level signal, when the rear end 5 of the train passes and the high level signal falls to the low level, the logic circuit 9 determines that the railroad crossing train has passed. It judges and operates passage R11 and stops a level crossing warning.

  The high level signal of the non-contact sensor 1 does not fall to the low level within a predetermined time (for example, 3 seconds) after the train enters the control section of the alarm end point condition and the localization relay contact 16 is turned on. In this case, the logic circuit 9 determines that a failure has occurred, operates the failure R14, displays the failure of the non-contact sensor 1, and records it in the self-diagnosis memory 10, and continues the failure R14 even when the power is turned off. Make it work. Further, when the localization relay contact 16 is turned on, if the non-contact sensor 1 does not output a high level signal, it is determined that a failure has occurred.

  When the output signal of the non-contact sensor 1 rises to a high level regardless of whether the localization relay contact 16 is on / off, the logic circuit 9 determines that the train has entered and operates the entry R12. When the output signal of the non-contact sensor 1 falls from the high level to the low level, the logic circuit 9 determines that the train has advanced and operates the advance R13.

  As described above, according to this embodiment, the output state of the single non-contact sensor 1 that detects an object that is installed along the rail and passes in front and the alarm end point condition (the localization relay contact 16). Therefore, it is possible to quickly detect that the end of the train has passed through the railroad crossing because the railroad crossing train passage is determined. Thereby, the opening of a railroad crossing can be performed as early as possible, and the waiting time at the railroad crossing of a passerby or a passing vehicle can be reduced as much as possible.

It is the top view and side view which show the railroad crossing train passage detection apparatus which is one Example of this invention. It is a block front view which shows the circuit structure of the railroad crossing train passage detection apparatus which is one Example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Non-contact sensor 2 Railroad crossing 3 Rail 4 Post 5 Train end 6 Control box 7 Photocoupler input circuit 8 Chattering mask circuit 9 Logic circuit (self-diagnosis means)
10 Self-diagnosis memory 15 Output circuit 16 Localization relay contact for alarm end point condition

Claims (5)

  A single non-contact sensor that is installed along the rail and detects an object passing in front, and a self-diagnosis unit that determines whether a railroad crossing train has passed according to the output state and end point condition of the non-contact sensor. A railroad crossing train detection device.   2. The railroad crossing according to claim 1, wherein the self-diagnosis means determines whether a railroad crossing train has passed based on a fall of a detection output of the non-contact sensor when the end point condition indicates the presence of a train. Train passage detection device.   The said self-diagnosis means determines with the failure of the said non-contact sensor, when the combination pattern of the detection output of the said non-contact sensor and the said end point conditions is abnormal. Railroad crossing detection device.   4. The crossing train passage detection device according to claim 1, further comprising a self-diagnosis memory for recording the determination of the self-diagnosis means.   5. The self-diagnosis means determines that a train has entered based on a rise of a detection output of the non-contact sensor, and determines that a train has advanced based on a fall of the detection output of the non-contact sensor. Railroad crossing train passage detection device according to the above.

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