JP4731226B2 - Train detector - Google Patents

Description

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

Conventionally, a railroad crossing controller is used for train detection. The railroad crossing controller detects whether or not a train exists in a predetermined section centered on the installation point (Patent Document 1). .
Japanese Patent No. 2613582

  However, since the crossing controller is detected by contact between the track circuit and the train wheel, the circuit system becomes complicated and it is difficult to reduce the cost. Moreover, the approach direction of the train could not be detected by itself.

(Object of invention)
The objective of this invention is providing the train detection apparatus which can aim at cost reduction.

In order to achieve the above-mentioned object, the train detection device of the present invention is installed at a predetermined distance along the rail, detects two objects that pass in front, and outputs a detection signal. And a train detection device connected to the two non-contact sensors, comprising a photocoupler input circuit, a chattering mask circuit, a logic circuit, an output circuit, and a control unit having a self-diagnosis memory, the chattering mask circuit but fine intermittent of detection signals of the two non-contact sensors are input to the photocoupler input circuit to process a continuous signal input to the logic circuit, said logic circuit, two of the continuous signal the presence or absence of the rise, the presence or absence of falling monitors the order of rising order and fall, the other of said continuous signal within element when a predetermined after the rise of one of the continuous signal There uplink output signal or downlink output signal based on the rising order, an upstream output signal and downlink output signal when the rising is simultaneous, the rise of the order and the falling order is reversed in the case of rising there or if the sensor failure output signal when there is no rise of one of the other of said continuous signal within element when a predetermined after the rise of the continuous signal, and inputs to each of the output circuit, the output signal is the sensor failure In the case of an output signal, the fact that the non-contact sensor is faulty is recorded in the self-diagnosis memory.

  According to the present invention, cost reduction can be achieved. Moreover, the approach direction of a train can be detected. Moreover, the failure of the non-contact sensor for train detection can be determined.

  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 installation state of a train detection device according to one embodiment of the present invention, and FIG. 2 is a circuit block diagram of the train detection device according to one embodiment of the present invention.

  1 and 2, non-contact sensors 1 and 2 such as an ultrasonic sensor, an optical sensor, and a magnetic sensor are predetermined from the ground by a column 4 and a support bar 5 at a predetermined distance (for example, 2256 mm) along the rail 3. When an object passing in front, that is, a train is detected, a high level signal is output. FIG. 1 shows a state in which the leading car 6 of the train passes in front of the non-contact sensors 1 and 2. A control box 7 is fixed to the column 4. Inside the control box 7, as shown in FIG. 2, the photocoupler input circuit 8 to which signals from the non-contact sensors 1 and 2 are inputted, and the output signal of the photocoupler input circuit 8 is finely interrupted (for example, off time) 200 to 500 ms) as a continuous signal, a logic circuit 10 for determining a train approach direction and a failure of the non-contact sensors 1 and 2 based on the logic of the output signals of the non-contact sensors 1 and 2, and a logic circuit Non-volatile self-diagnostic memory 11 that records 10 determinations, and uplink R12 (R is a relay), downlink R13, failure R14, uplink output R15, and downlink output R16 according to the determination of logic circuit 10 or An output circuit 17 that operates simultaneously is provided.

  The logic circuit 10 is composed of all hardware by a general-purpose logic IC. This is to provide a fail-safe function at a low cost. Uplink R12 and downlink R13 are relays that start an alarm when they are dropped. The failure R14 is a relay that notifies the failure of the non-contact sensors 1 and 2. The uplink output R15 and the downlink output R16 are relays that continue to operate for a predetermined time (for example, a fixed time of 3 seconds or more) after the last tail wheel has passed.

  An example of the logic operation of the logic circuit 10 will be described below with reference to FIGS.

  First, normal down train detection will be described with reference to FIG. Downward is the direction of the arrow in FIG. The non-contact sensor 1 detects the leading vehicle 6 and outputs a high level signal, and then the non-contact sensor 2 detects the leading vehicle 6 (or train) within a short time (for example, 3 seconds), and then the high level signal. Is output, the logic circuit 10 determines that the train is going down and drops the down R13 to give a down warning. The output of the logic circuit 10 has a slight slow / release element (for example, 500 ms).

  Next, the detection of the down train when passing through the tilt will be described with reference to FIG. The non-contact sensor 1 detects the leading vehicle 6 and outputs a high level signal. Although the signal from the non-contact sensor 1 is finely interrupted, it becomes a continuous signal by the chattering mask circuit 9. Thereafter, when the non-contact sensor 2 detects the leading vehicle 6 (or train) and outputs a high level signal within an hour (for example, 3 seconds), the logic circuit 10 determines that the train is going down and falls down R13. Let the down alarm occur.

  The failure detection of the non-contact sensor 2 in the abnormal train detection will be described with reference to FIG. The non-contact sensor 1 detects the leading vehicle 6 and outputs a high level signal. Thereafter, when the non-contact sensor 2 does not detect the leading vehicle 6 (or train) within an hour (for example, 3 seconds), the logic circuit 10 determines that the non-contact sensor 2 is in failure and activates the failure R14. The failure of the non-contact sensor 2 is displayed and recorded in the self-diagnosis memory 11, and the failure R14 is continuously operated even when the power is turned off. At the same time, since it is not possible to determine whether the train is an ascending train or a descending train, the ascending alarm and the descending alarm are performed by dropping the ascending R12 and the descending R13.

  The simultaneous detection of both non-contact sensors 1 and 2 in the abnormal train detection will be described with reference to FIG. When the non-contact sensors 1 and 2 simultaneously detect the leading vehicle 6 and output a high level signal, the logic circuit 10 assumes normal train detection, but because the direction is unknown, the R12 and R13 are dropped simultaneously. To raise and lower the alarm. It is not determined that a failure has occurred.

  The case where both non-contact sensors 1 and 2 continue detection for a long time among train detection at the time of abnormality is demonstrated with reference to FIG. When the non-contact sensors 1 and 2 continue to output a high level signal for a long time, the logic circuit 10 determines that the train is stopped, and continues the down alarm with the down R 13 kept falling. It is not determined that a failure has occurred.

  Of the train detection at the time of abnormality, a case where the rising and falling edges of the high-level signal outputs of the non-contact sensors 1 and 2 are monitored and the order is different will be described with reference to FIG. The approach direction is determined based on the rise of the signal output of the non-contact sensors 1 and 2, and a descending alarm is issued. Then, the trailing edge of the high-level signal output of the non-contact sensors 1 and 2 is monitored, and the trailing edge of the signal output of the non-contact sensors 1 and 2 is in the order of non-contact sensor 2 → non-contact sensor 1. Then, the logic circuit 10 determines that the non-contact sensor 2 is faulty, operates the fault R14, and displays the fault of the non-contact sensor 2.

  A case where the high-level signal outputs of the non-contact sensors 1 and 2 are simultaneously detected in the abnormal train detection will be described with reference to FIG. The approach direction is determined based on the rise of the signal output of the non-contact sensors 1 and 2, and a descending alarm is issued. Then, the subsequent fall of the high level signal output of the non-contact sensors 1 and 2 is monitored, and if the fall of the signal output of the non-contact sensors 1 and 2 is simultaneous, the logic circuit 10 determines that a failure has occurred. do not do.

  As described above, according to the present embodiment, since the non-contact sensors 1 and 2 are used, the circuit system is simplified and the cost can be reduced. Further, the train approach direction can be detected and the train speed can be detected based on the time difference between the detection outputs of the non-contact sensors 1 and 2. Further, when the combination pattern of the detection outputs of the non-contact sensors 1 and 2 is abnormal, the failure of the non-contact sensors 1 and 2 can be determined.

It is the top view and side view which show the train detection apparatus which is one Example of this invention. It is a block front view showing the circuit composition of the train detection device which is one example of the present invention. 2 is a time chart illustrating an example of a logical operation of the logic circuit in FIG. 1. 6 is a time chart showing another example of the logic operation of the logic circuit in FIG. 1. 6 is a time chart showing another example of the logic operation of the logic circuit in FIG. 1. 6 is a time chart showing another example of the logic operation of the logic circuit in FIG. 1. 6 is a time chart showing another example of the logic operation of the logic circuit in FIG. 1. 6 is a time chart showing another example of the logic operation of the logic circuit in FIG. 1. 6 is a time chart showing another example of the logic operation of the logic circuit in FIG. 1.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1, 2 Non-contact sensor 3 Rail 4 Support | pillar 5 Support bar 6 Leading car 7 Control box 8 Photocoupler input circuit 9 Chattering mask circuit 10 Logic circuit (self-diagnosis means)
11 Self-diagnosis memory 17 Output circuit

Claims (1)

Two non-contact sensors that are installed at a predetermined distance along the rail, detect an object that passes in front, and output a detection signal;
A train detection device connected to the two non-contact sensors and having a control unit including a photocoupler input circuit, a chattering mask circuit, a logic circuit, an output circuit, and a self-diagnosis memory,
The chattering mask circuit processes fine interruptions of detection signals of the two non-contact sensors input to the photocoupler input circuit as continuous signals and inputs them to the logic circuit.
The logic circuit is:
Whether the rise of two of said continuous signal, the presence or absence of falling monitors the order of rising order and fall,
When there is a rise of the other continuous signal within a predetermined time after the rise of one of the continuous signals , the upstream output signal or the downstream output signal is based on the order of the rise,
When the rising is simultaneous, the upstream output signal and the downstream output signal are
The sensor failure output signal when there is no rise of the rise of the order and if the order of falling is reversed or one of the other of said continuous signal within element when after a predetermined rise of the continuous signal,
A train detection device, wherein each of the signals is input to the output circuit, and when the output signal is the sensor failure output signal, the fact that the non-contact sensor is failed is recorded in the self-diagnosis memory.

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