JPH07329772A - Detecting device for fall of passenger - Google Patents

Abstract

PURPOSE:To enable a train to urgently stop only at need by providing a sensor group composed of pyroelectric sensors arranged alternately on a side face on the track side of a platform and PSD sensors whose detecting distances are set up to a fixed value, and judging that a passenger has fallen down onto a track when both adjacent sensors issue output signals. CONSTITUTION:A plurality of PSD sensors 2 and of pyroelectric sensors 3 are linearly alternately provided on the side face on the side of a track 4 of a platform 1 for composing a sensor group. The PSD sensor 2 whose directivity is narrow as shown by a solid line and the pyroelectric sensor 3 whose directivity is wide as shown by a dotted line are used. The PSD sensor 2 and the pyroelectric sensor 3 which are mutually adjacent are AND computed in an AND circuit, and the result of each AND computation is OR computed in an OR circuit, and when the output of the above computation exists, an alarm signal is sent out from an alarm circuit. Thus the alarm signal is generated only when a passenger falls down onto a track to urgently stop a train entering the above track 4.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a passenger fall detection device for detecting a state where a passenger falls from a platform onto a track.

[0002]

2. Description of the Related Art At a railway station, it is extremely dangerous for passengers to fall onto the tracks from the platform. Therefore, a rubber mat with built-in electrical contacts is laid under the conventional platform, and if there is a fallen object, the weight of the electrical contact causes the electrical contact. Are connected and used in some cases to obtain an alarm output.

[0003]

However, such a conventional device may not operate if the weight of the fallen object is light, or the reliability of the contact may be lost due to secular change of the mechanical contact. Further, since the structure is installed on the track, there are various problems such that the maintenance work of the track is hindered, and the passenger operates even when he / she drops his luggage.

The present invention has been made in view of such a situation, and it is intended to detect only passengers who have fallen to the platform with high reliability and not to hinder track maintenance work.

[0005]

In order to solve such a problem, a first aspect of the present invention comprises a pyroelectric sensor alternately arranged on a side surface of a platform on a line side and a PSD sensor in which a detection distance is set as a predetermined value. Sensor group, a plurality of AND circuits that take the logical product of the PSD sensor and the pyroelectric sensor that are adjacent to each other in the sensor group, and an OR circuit that generates an output signal when an output signal is generated from one of the AND circuits. It is a thing. The second invention is the same as the first invention,
When the adjacent PSD sensor output signals sequentially generate output signals via the pyroelectric sensor, the train identification logic circuit determines that a train has entered, and even if an output signal is generated from the OR circuit, an alarm output is sent. Ban. In a third aspect based on the first aspect, when the train detection sensor detects the entrance of a train, the alarm output is prohibited even if an output signal is generated from the OR circuit.

[0006]

According to the first aspect of the present invention, it is determined that the passenger has fallen onto the railroad track when the adjacent outputs of the pyroelectric sensor and the PSD sensor alternately arranged on the side surface of the platform on the railroad track side occur. In a second aspect based on the first aspect, when the train identification logic circuit detects that the PSD sensor output signals sequentially generate output signals, the alarm output from the OR circuit is prohibited. According to a third aspect of the present invention, in the first aspect, when the train detection sensor that detects the entry of a train detects the entry of the train, the output of the alarm output from the OR circuit is prohibited.

[0007]

1 is a perspective view showing an embodiment of the present invention, in which a plurality of PSD sensors 2 and a plurality of pyroelectric sensors 3 are alternately linearly formed on a side surface of a platform 1 on a side of a line 4. The sensor group is arranged in the above, and the directivity is determined such that the cover range is slightly above the upper surface of the line 4. The directivity of the PSD sensor 2 is narrow as shown by a solid line, and the directivity of the pyroelectric sensor 3 is wide as shown by a dotted line.

FIG. 2 shows the connection between the PSD sensor 2 and the pyroelectric sensor 3. The AND circuit 7 performs an AND operation on the adjacent PSD sensor 2 and pyroelectric sensor 3 and outputs the result of each AND operation. The circuit 8 carries out an OR operation, and when there is an output, an alarm signal is sent from the alarm circuit 9. The output of each PSD sensor is supplied to the train identification theory circuit 6, which detects that a train has entered by the logic described later, and supplies the detection result to the alarm circuit 9. Further, if necessary, as shown in FIG. 3, a train detection sensor 5 provided on the upper roof or the like of the platform 1 detects the entrance of a train.

As described above, when the AND condition of any combination of the PSD sensor 2 and the pyroelectric sensor 3 adjacent to the PSD sensor 2 is satisfied, an output signal is generated from the OR circuit 8 and an alarm output is generated from the alarm circuit 9. Therefore, it is determined that there is an object on the track 4. The PSD sensor 2 sets a detection distance and limits the distance to a desired range. In this example, it is set to about 1.2 m. The pyroelectric sensor 3 cannot structurally limit the detection distance. However, when a passenger falls from the platform 1 onto the track 4, a thermal change occurs due to the body temperature. Further, since the PSD sensor 2 is also activated by the infrared reflection from the passenger, it is possible to determine that the AND condition of the PSD sensor 2 and the pyroelectric sensor 3 is satisfied and the passenger has fallen on the track.

However, when a baggage, a newspaper, an umbrella, or the like is dropped, the PSD sensor 2 detects it, but since they do not have the heat as detected by the pyroelectric sensor 3, they do not detect it. No alarm output is obtained. When a lit cigarette or the like is thrown, the pyroelectric sensor 3 detects it,
Since the area of the falling object is small, the PSD sensor 2 does not detect it. In this example, the minimum detection limit is about 15 cm in diameter.

Further, if the detection distance limit of the PSD sensor 2 is set to about 1.2 m, for example, even if the above-mentioned states occur far away, that is, outside the alarm range, the PSD sensor 2
Has a distance limiting function, no alarm output is sent. Therefore, the maintenance staff does not malfunction even if the maintenance staff is near the track. When a train enters the sensing area, the train generates heat from its structure, so the same warning output as when the passenger falls is generated. In this case, P
If the SD sensor 2 is monitoring, the PSD sensor 2 operates sequentially in synchronization with the approach of the train, so the train identification logic circuit 6 judges that such a state is the approach of the train, and issues an alarm. I try not to.

As another method for distinguishing a train from a passenger, a train detection sensor 5 for detecting the train itself is provided as shown in FIG. 3, and the alarm circuit 9 does not send an alarm signal when the train detection sensor 5 detects the train. You may do it.

In this way, when a passenger falls on the track, for example, by issuing a warning by sound or light,
This allows the station staff or the driver to take optimal action. Alternatively, the warning signal may turn the signal red, or if there is a train approaching the platform, braking measures may be taken.

[0014]

As described above, according to the first aspect of the present invention, an alarm output is generated when a logical product output of the adjacent PSD sensor and pyroelectric sensor is generated, so that only passengers who have fallen into the track can be detected. It is possible to detect that the train does not stop the train unnecessarily by detecting anything other than passengers, and since it is a non-contact system, it has the effect of not changing over time. In the second invention, in the first invention, it is determined that the train has entered when the PSD sensor output signals sequentially generate output signals, and the alarm output is prohibited. The effect of not causing malfunctions, being able to detect only passengers who have fallen into the track, not stopping the train unnecessarily by detecting other things, and being a non-contact system, there is no change over time Have. According to a third aspect of the present invention, in the first aspect, when the train detection sensor detects the entrance of the train, the alarm output is prohibited. Only the passengers who have fallen can be detected, the trains are not stopped unnecessarily by detecting other passengers, and there is an effect that there is no secular change because of the non-contact method.

[Brief description of drawings]

FIG. 1 is a perspective view showing an arrangement state of a PSD sensor and a pyroelectric sensor.

FIG. 2 is a circuit diagram showing a connection between a PSD sensor and a pyroelectric sensor.

FIG. 3 is a diagram showing a relationship between a sensor mounting state and a train.

[Explanation of symbols]

 1 platform 2 PSD sensor 3 pyroelectric sensor 4 line 5 train detection sensor 6 train identification logic circuit 7 AND circuit 8 OR circuit 9 alarm circuit

Claims (3)

[Claims] 1. A sensor group comprising a pyroelectric sensor which is alternately arranged on a side surface of a platform on a line side and a PSD sensor in which a detection distance is set as a predetermined value, a PSD sensor output signal and a pyroelectric sensor adjacent to the PSD sensor. A plurality of AND circuits that perform AND operation of sensor output signals for each of the PSD sensor and the pyroelectric sensor that form the sensor group, and an OR circuit that generates an output signal when an output signal is generated from any one of the AND circuits Passenger fall detection device consisting of and. 2. The train identification logic circuit according to claim 1, which detects that the output signals of adjacent PSD sensors sequentially generate output signals via a pyroelectric sensor, and an alarm output when the output signal is generated from the OR circuit. And a warning signal output circuit for prohibiting the output of the warning output when the output signal of the train identification logic circuit is generated. 3. The train detection sensor according to claim 1, and an alarm output when an output signal from the OR circuit is generated, and the alarm output when an output signal from the train detection sensor is generated. Passenger fall detection device, which is provided with an alarm output circuit for prohibiting the sending of information.