JP4920920B2 - Crossing object detection device - Google Patents

Description

  The present invention relates to a crossing object detection device having excellent maintainability.

2. Description of the Related Art Conventionally, there is known a crossing obstacle detection device that detects an automobile or a pedestrian existing on a crossing when a train approaches the crossing and generates an alarm.
In such a crossing obstacle detection device, a plurality of sets of light emitters and light receivers are installed in the crossing, and an optical axis type crossing obstacle detection configured to cover the crossing road with a plurality of light beams. There is a device. Specifically, in an optical axis level crossing obstacle detection device, if there is an obstacle such as an automobile in a level crossing where the train is approaching and shuts off and rings, the level crossing obstacle detection device detects the obstacle. By operating a special signal light emitter, the train is stopped before the railroad crossing to prevent collision between the train and an obstacle to ensure safety.

Among the above-mentioned crossing obstacle detection devices, there is a crossing obstacle detection device configured to transmit a laser wave while scanning a crossing road and receive a laser wave reflected by an obstacle in the crossing road. is there. In such a level crossing obstacle detection device, when a reflected laser wave is received, it is recognized that an obstacle exists in the level crossing road, and whether the obstacle is a car, a pedestrian, a bicycle, or the like (for example, , See Patent Document 1). In addition, although it is not specified in the above-mentioned patent document 1 about identification of such an obstacle, if the position of an obstacle is specified from the irradiation time of a laser wave and the time required to receive the laser wave, Guessed. In addition, based on the reception result of receiving the laser wave during a period of scanning the laser wave on the railroad, it is estimated that the size of the obstacle is estimated to identify whether the obstacle is a car, a pedestrian or a bicycle. Is done.
JP 2002-37078 A (3rd and 4th pages, FIG. 1)

  However, in the optical axis type crossing obstacle detection device described above, if the optical axis connecting the light emitter that emits the light beam and the light receiver that receives the light beam is shifted, the light receiver cannot receive the light beam. There was a risk of judging that there was an obstacle on the railroad crossing. In such a case, the train operation is hindered. Also, if the light emitting lens or the light receiving lens is dirty and the light beam cannot be emitted or received properly, or if the field of view is poor due to snow or heavy fog, there are obstacles on the railroad crossing as well. There was a risk of judging.

  If the optical axis connecting the light emitter that transmits the light beam and the light receiver that receives the light beam is deviated as described above, it takes effort to adjust the optical axis. In addition, when the lens of the light emitter and the lens of the light receiver are soiled, efforts are similarly required to clean the lens of the light emitter and the lens of the light receiver.

Moreover, since it is necessary to install the above-mentioned light emitter and light receiver near the railroad crossing, it is difficult to select a place for installing the light emitter, the light receiver, and a cable connecting the two.
Note that the above-described various problems may also occur in the crossing obstacle detection device using the above-described laser wave.

  Such problems are not limited to railroad crossings installed on tracks, but also crosswalks installed on roads such as pedestrian crossings installed on roads and crossways installed on premises roads such as factories. The same problem may occur in

  The present invention has been made in view of such problems, and an object of the present invention is to provide a moving object detection device on a crossing road having excellent maintainability.

  The object detection device for a crossing road according to claim 1 made to solve the above-mentioned problems is characterized by "equipped with an object detection means using a magnetic sensor". Specifically, the magnetic sensor is embedded in the monitoring area and measures the distribution of geomagnetism at the embedded point. The above-described monitoring area is set so that a vehicle traveling on the traveling road includes a crossing road installed on the traveling road. And a detection means detects the object which exists in the monitoring area | region based on the signal from a magnetic sensor.

  In conventional level crossing obstacle detection devices, if the optical axis connecting the light emitter that emits the light beam and the light receiver that receives the light beam is shifted, the light receiver cannot receive the light beam, and the obstacle on the railroad crossing. There was a risk of determining that there was. In such a case, the train operation is hindered. Also, if the light emitting lens or the light receiving lens is dirty and the light beam cannot be emitted or received properly, or if the field of view is poor due to snow or heavy fog, there are obstacles on the railroad crossing as well. There was a risk of judging.

  On the other hand, according to the present invention, the magnetic sensor embedded in the monitoring area is used as the means for detecting the object, and the detection means detects the object existing in the monitoring area based on the signal from the magnetic sensor. To do. As a result, it is possible to provide a crossing object detection device having excellent maintainability as follows.

(A) Since a light beam is not used unlike a conventional railroad crossing obstacle detection device, adjustment of the optical axis of the light beam and maintenance of the lens are not required, and the device operates normally even in snow or dense fog.
(B) Since the detection means can be adjusted outside the track, work safety and workability are improved.

(C) Unlike a conventional railroad crossing obstacle detection device, since a light emitter is not used, the light bulb of the light emitter is not broken, and the magnetic sensor requires little maintenance.
(D) Since the magnetic sensor is buried in the ground as described above, the installation position can be freely determined within the limits of construction, and it does not interfere with the work in the track.

(E) Unlike an optical axis type using a light beam as in a conventional railroad crossing obstacle detection device, since the pedestrian is not detected in the present invention, it is possible to prevent a driving obstacle due to a pedestrian crossing immediately before.
(F) Whereas a conventional railroad crossing obstacle detection device detects an obstacle with a "line", the present invention can detect an obstacle with a "surface", so that the detection performance for a small vehicle or the like is improved.

  In this case, specific examples of the above-mentioned “travel road” include a track on which a railway vehicle travels, a “road” on which a vehicle such as an automobile travels, and a “premises road” on which a transport vehicle travels on a premises such as a factory. Can be mentioned. Specific examples of the crossing include a “crossing road” installed on a track, a “crosswalk” installed on a road, and a “crossing road” installed on a campus road such as a factory.

Further, the above-described object detection device may be installed in a space such as a parking lot and detect whether or not a metal object such as an automobile or a bicycle exists in the space.
In addition, about the above-mentioned magnetic sensor, you may install one magnetic sensor in a monitoring area | region. However, when this single magnetic sensor fails, it is impossible to detect an object present in the monitoring area. Therefore, it is conceivable to arrange a plurality of magnetic sensors in the monitoring area so that an object is detected simultaneously by two or more magnetic sensors. Specifically, as in claim 2, there are a plurality of magnetic sensors, and for the plurality of magnetic sensors, at least two of the plurality of magnetic sensors are geomagnetic due to an object existing in the monitoring area. It is conceivable that they are arranged at positions where changes can be measured simultaneously. If comprised in this way, even if some magnetic sensors fail, the object which exists in the monitoring area | region can be detected reliably. Also, there are points in the magnetic sensor where the geomagnetic distribution is measured as unchanged due to its structure, but even if an object exists at that point, other magnetic sensors measure the object, so It can be measured.

  In addition, it is conceivable that at least a part of the plurality of magnetic sensors described above is embedded in the vicinity of a blocking gutter installed in the monitoring area (claim 3). If comprised in this way, the object which exists in a monitoring area | region can be correctly determined by measuring the geomagnetism in the outer periphery vicinity of a monitoring area | region.

  By the way, when a magnetic sensor is disposed in the vicinity of the outer edge of the monitoring area, the magnetic sensor may erroneously detect an object existing outside the monitoring area as an object existing within the monitoring area. Therefore, it is conceivable that the magnetic sensor is installed such that its measurement range is within the above-described monitoring area (claim 4). If comprised in this way, the object which exists outside a monitoring area | region will not be detected accidentally as an object which exists in a monitoring area | region.

By the way, in the electric railway, since the surrounding geomagnetism fluctuates due to the current flowing through the train line or rail, the reliability of the measurement result by the magnetic sensor may be lowered. Therefore, paying attention to the fact that the geomagnetic component in the direction along the rail direction is not easily affected, the magnetic sensor measures the distribution of the geomagnetism in the direction parallel to the trajectory as the travel path at the buried point. (Claim 1 ). If comprised in this way, an object can be detected more correctly, without being influenced by the fluctuation | variation of a surrounding geomagnetism by the electric current which flows through a train line or a rail.

Moreover, by utilizing the property that the magnetic variation is slow due to the current flowing through the electric power line or rail, magnetic sensors, it is considered to have a filter for removing low frequency components from the terrestrial magnetism measured (claim 5). If comprised in this way, an object can be detected more correctly by removing a low frequency component.

  By the way, for example, in a crossing road moving object detection device installed at a railroad crossing, etc., by diagnosing that each component part of the crossing road moving object detection device such as an object detection means is operating normally, Failure of the component parts is detected to ensure the safety of vehicle operation. As such a diagnostic method, for example, a fixed object such as a pillar is installed in the monitoring area and detected by the object detection means, and when the detected fixed object is detected at the same position, the moving object detection of the crossing road is performed. There is known a method for determining that each component of the apparatus is operating normally. However, such a determination method has a problem that a fixed object for diagnosis such as a pillar needs to be installed in the monitoring area.

Therefore, it is conceivable to diagnose that each component part of the object detection device in the crossing is operating normally by measuring the magnetism generated for self-diagnosis. Specifically, as in claim 6 , based on a signal from a magnetism generating means for generating magnetism into the monitoring region and a magnetic sensor that measures the distribution of magnetism generated by the magnetism generating means, the crossing is performed. It is conceivable to include self-diagnosis means for determining whether or not each component of the road object detection device is operating normally.

  With this configuration, whether or not each component part of the moving object detection device of the crossing path such as the object detection unit is operating normally without installing a diagnostic fixed object in the monitoring area. Can be diagnosed.

By the way, as described in claim 7, the sensor includes a reference sensor installed outside the monitoring area and capable of measuring a magnetic field component generated by a current flowing through the rail and the overhead wire, and the detection means includes a signal from the magnetic sensor and a reference sensor. It is conceivable that an object existing in the monitoring area is detected based on the signal from. If comprised in this way, the influence of the magnetic field fluctuation | variation which generate | occur | produces with the electric current which flows through a rail or an overhead wire can be removed.

  By the way, when the situation in the monitoring area changes, for example, when a facility such as an alarm device on a railroad crossing is newly installed in the monitoring area, the geomagnetic distribution in the monitoring area may change. In such a case, there exists a possibility that the object which exists in the monitoring area | region cannot be detected correctly. In addition, the peripheral magnetic field may change due to the gradual magnetization of iron equipment such as rails in the monitoring area. In such a case as well, there is a possibility that an object existing in the monitoring area cannot be detected accurately.

Therefore, for example, when a predetermined condition such as when a vehicle passes a crossing road is satisfied, it is conceivable to reset a reference value for determining that an object exists. Specifically, as claimed in claim 8, comprising a railroad crossing control information acquisition means for acquiring railroad crossing control information used for crossings controlled from outside, the detection means, the railroad crossing control information acquired by the crossing control information acquiring means Based on this, it is determined whether or not a rail vehicle as a vehicle has passed through the railroad crossing, and if it is determined that the rail vehicle has passed through the railroad crossing, a reference value for detecting an object existing in the monitoring area is set. It is possible to reset.

  In this way, even if the geomagnetic distribution changes due to a change in the situation in the monitoring area for the reasons described above, an object can be detected more accurately.

Embodiments of the present invention will be described below with reference to the drawings.
[First embodiment]
FIG. 1 (a) is an explanatory view showing a crossing road where the magnetic sensor 10 and the magnetic sensor 10 are installed, FIG. 1 (b) is an explanatory view showing a crossing road, and FIG. 1 (c) is the vicinity of the crossing. It is a schematic block diagram of the object detection apparatus 1 installed in. FIG. 2 is an explanatory diagram showing the distribution of geomagnetism around the automobile. FIG. 3 is a schematic configuration diagram of the magnetic sensor 10.

[Description of Configuration of Object Detection Device 1]
As shown in FIG. 1C, the object detection device 1 includes N magnetic sensors 10 and a control box 20. Note that N magnetic sensors 10 are connected to the control box 20. In the present embodiment, four magnetic sensors 10 are connected to the control box 20.

[Description of Configuration of Magnetic Sensor 10]
The magnetic sensor 10 is configured to measure the influence of the geomagnetic fluctuation that the automobile has on the periphery using physical properties that the magnetic field lines tend to concentrate inside a metal object (hereinafter, automobile) such as an automobile or a bicycle. Sensor. Specifically, as shown in FIG. 3, the magnetic sensor 10 includes a first sensor 11 that measures a change in geomagnetism in the direction along the X-axis direction and a change in geomagnetism in the direction along the Y-axis direction. A second sensor 12 for measuring, a third sensor 13 for measuring geomagnetic fluctuations in the direction along the Z-axis direction, and a first AD for converting a signal output from the first sensor 11 into a digital signal A converter 14, a second AD converter 15 that converts the signal output from the second sensor 12 into a digital signal, and a third AD that converts the signal output from the third sensor 13 into a digital signal The digital signal output from the conversion unit 16 and the first AD conversion unit 14, the digital signal output from the second AD conversion unit 15, and the digital signal output from the third AD conversion unit 16 are processed. A signal processing circuit 17; It is.

  The above-mentioned X-axis direction is a direction along the extending direction of the railroad crossing, the above-mentioned Z-axis direction is a direction along the vertical direction, and the above-mentioned Y-axis direction is the longitudinal direction of the rail of the track. It is the direction along.

In addition, the signal processing circuit 15 includes a high-pass filter (High Pass Filter, not shown) that removes low-frequency components from the measured geomagnetism.
The magnetic sensor 10 is embedded in a monitoring area set near the railroad crossing. As shown in FIG. 1 (c), the above-mentioned monitoring area means whether or not an automobile exists in the above-mentioned railroad crossing so that the railway vehicle can safely pass through the railroad crossing installed on the track. This area is set to determine whether or not, and includes a railroad crossing installed on the track. In the present embodiment, there are four magnetic sensors 10, and each magnetic sensor 10 is installed one at a time in the middle of the four areas obtained by dividing the monitoring area including the railroad crossing into the front, rear, left, and right. As a result, when a vehicle passing through the railroad crossing passes through the left side or the center of the railroad crossing, at least two of the plurality of magnetic sensors simultaneously detect geomagnetic changes caused by objects existing in the monitoring area. Since it is arrange | positioned in the position which can be measured, the at least 2 or more magnetic sensor 10 can detect the motor vehicle simultaneously.

  These magnetic sensors 10 are embedded at a point 0.5 m from the ground surface (reference surface) (see FIG. 1A). In addition, about the magnetic sensor 10, it is embed | buried in the attitude | position so that the measurable range may be settled in a monitoring area | region.

  Each magnetic sensor 10 measures the distribution of geomagnetism in the direction parallel to the rail (Y axis) at the buried point. This is because the geomagnetic component in the direction along the rail is not easily affected.

[Description of Configuration of Control Box 20]
The control box 20 is mainly composed of a known microcomputer including a CPU, ROM, RAM, I / O, a bus line connecting these components, and the like. The control box 20 has a function of detecting an automobile existing in the monitoring area based on the digital signal transmitted from the magnetic sensor 10. The control box 20 corresponds to detection means.

[effect]
(1) As described above, according to the object detection device 1 of the first embodiment, the magnetic sensor 10 embedded in the monitoring area is used as the means for detecting the object, and the control box 20 as the detection means is magnetic. Based on the signal from the sensor 10, an automobile present in the monitoring area is detected. Thereby, the object detection apparatus 1 excellent in maintainability can be provided as follows.

(A) Since a light beam is not used unlike a conventional railroad crossing obstacle detection device, adjustment of the optical axis of the light beam and maintenance of the lens are not required, and the device operates normally even in snow or dense fog.
(B) Since the control box 20 can be adjusted outside the track, work safety and workability are improved.

  (C) Unlike a conventional railroad crossing obstacle detection device, since a light emitter is not used, the light bulb of the light emitter is not broken, and the magnetic sensor 10 requires little maintenance.

(D) Since the magnetic sensor 10 is buried in the ground as described above, the installation position can be freely determined within the limits of construction, and it does not interfere with the work in the track.
(E) Unlike the optical axis type using a light beam as in the conventional level crossing obstacle detection device, the object detection device 1 of the present embodiment does not detect a pedestrian, and thus prevents a driving obstacle due to a pedestrian crossing immediately before. Can do.

  (F) Whereas a conventional level crossing obstacle detection device detects an obstacle with a “line”, the object detection device 1 of the present embodiment can detect an obstacle with a “surface”. Detection performance is improved.

  (2) Moreover, according to the object detection apparatus 1 of the first embodiment, at least two of the magnetic sensors 10 are arranged at positions where geomagnetic changes due to objects existing in the monitoring area can be simultaneously measured. As a result, even if some of the magnetic sensors fail, the object can be reliably detected. In addition, the magnetic sensor 10 has a region where no geomagnetic variation due to a metal object occurs, but as described above, at least two of the plurality of magnetic sensors 10 are affected by an object existing in the monitoring region. The object can be surely detected by being arranged at a position where can be measured simultaneously.

  (3) Moreover, according to the object detection apparatus 1 of the first embodiment, the magnetic sensor 10 is embedded in substantially the center of each of the four areas obtained by dividing the monitoring area, and the measurement range is the monitoring area described above. Installed to be within the area. Thus, an object existing outside the monitoring area is not erroneously detected as an object existing within the monitoring area.

  (4) Further, according to the object detection device 1 of the first embodiment, focusing on the fact that the magnetic component in the direction along the rail direction is not easily affected, the magnetic sensor 10 is located at the point where it is embedded. The distribution of geomagnetism in the direction parallel to the rail is measured. As a result, the object can be detected more accurately without being affected by fluctuations in the surrounding geomagnetism due to the current flowing through the train line or rail.

  (5) Further, according to the object detection device 1 of the first embodiment, the signal processing circuit 15 of the magnetic sensor 10 measured using the property that the magnetic fluctuation due to the current flowing through the train line or rail is slow. A high-pass filter that removes low-frequency components from the geomagnetism is provided inside. Thus, the object can be detected more accurately by removing the low frequency component.

[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, It is possible to implement in the following various aspects.

  (1) In the first embodiment, the object detection device 1 is installed on a railroad crossing installed on a track on which a railway vehicle travels. However, the present invention is not limited to this. You may install in. For example, the object detection device 1 is installed on a pedestrian crossing on a road on which a vehicle such as an automobile travels. Further, the object detection device 1 is installed on a crossing road of a campus road such as a factory.

Further, the object detection device 1 may be installed in a space such as a parking lot, and it may be detected whether or not a metal object such as an automobile or a bicycle exists in the space.
(2) In the above embodiment, the four magnetic sensors 10 are installed in the monitoring area. However, the present invention is not limited to this, and the number of magnetic sensors 10 may be one or a plurality other than four. But you can.

  (3) When a plurality of magnetic sensors 10 are present, some of the magnetic sensors 10 may be embedded in the vicinity of the barriers installed in the monitoring area. However, in order to prevent the magnetic sensor 10 from measuring the distribution of geomagnetism outside the monitoring area, the embedded position of the magnetic sensor 10 and the installation angle of the magnetic sensor 10 are set so that the detection area of the magnetic sensor 10 is closer to the rail side than the barrier. Need to be considered.

  If comprised in this way, the magnetic sensor 10 embed | buried in the vicinity of the barrier will measure the horizontal component of the geomagnetism in the vicinity of the outline of the monitoring area, so that an object existing in the monitoring area can be accurately determined.

  (4) Further, when it is determined that the railway vehicle has passed through the railroad crossing, a reference value for detecting an automobile existing in the monitoring area may be reset. Specifically, as shown in FIGS. 4 and 5, the alarm generation device 100 includes the above-described object detection device 1, a train approach detection unit 30, a train passage detection unit 40, a railroad crossing control device 50, And a signal light emitter 60.

  Among these, the train approach detection unit 30 is capable of detecting a railway vehicle and is installed in the vicinity of the rail before a predetermined distance from the railroad crossing on the track. The train approach detection unit 30 has a function of detecting that the railway vehicle has approached a predetermined distance before the railroad crossing and transmitting a signal indicating that to the railroad crossing control device 50.

  Similarly, the train passage detection unit 40 can detect a railcar and is installed in the vicinity of the rail at a predetermined distance behind the railroad crossing on the track. The train passage detection unit 40 has a function of detecting that the railway vehicle has arrived a predetermined distance behind the railroad crossing and transmitting a signal indicating the fact to the railroad crossing control device 50.

  When the crossing control device 50 receives the signal from the train approach detection unit 30 and the signal from the train passage detection unit 40, a signal indicating that the reference value is reset is sent to the control box 20 of the object detection device 1. It has a function to transmit. Further, when the railroad crossing control device 50 receives a signal from the train approach detection unit 30 and a signal from the train passage detection unit 40, the crossing control device 50 transmits a signal (detection timing) indicating that light is emitted to the special signal light emitter 60. It has the function to do. The level crossing control device 50 corresponds to a level crossing control information acquisition unit.

The special signal light emitter 60 is configured to emit an alarm by emitting light to a pedestrian or a passerby such as an automobile in the vicinity of the railroad crossing according to a signal from the railroad crossing control device 50.
Next, alarm generation processing executed by the alarm generation device 100 will be described with reference to the flowchart of FIG. This process is executed when the alarm generating device 100 is turned on.

  First, when the railroad crossing control device 50 determines whether or not the railcar has approached the railroad crossing (S110), and determines that the railcar has passed the starting point based on a signal from the train approach detection unit 30. (S120), it is determined that the railway vehicle has approached the railroad crossing, and a railroad crossing is made (S130), and then the barrier bar is lowered (S140). Further, when it is determined that the railway vehicle has passed the starting point based on the signal from the train passage detection unit 40 (S150), the control box 20 of the object detection device 1 resets the reference value (S160). Then, the crossing control device 50 raises the barrier bar. Then, this process ends.

According to the alarm generation device 100 configured in this way, even if the distribution of geomagnetism changes due to a change in the situation in the monitoring area, it is possible to detect the vehicle more accurately.
(5) Further, the object detection device 1 may have a self-diagnosis function. Specifically, as shown in FIG. 7, the self-diagnosis circuit 90 includes a magnetic sensor 10, a check coil 70, and a comparison / collation unit 80.

  Among these, the check coil 70 is disposed at a position where magnetism is generated in the detection axis direction of the magnetic sensor 10. For example, if the detection axis of the magnetic sensor 10 is in the vertical direction, the check coil 70 is disposed below, above, or both, and generates magnetism toward the monitoring area. The check coil 70 corresponds to a magnetism generating means.

  The comparison / collation unit 80 has a function of comparing the magnetism generated by the check coil 70 and the magnetism from the check coil 70 measured by the magnetic sensor 10. The comparison / collation unit 80 corresponds to a self-diagnosis unit.

In addition, you may comprise so that the control box 20 of the object detection apparatus 1 may have the function which the above-mentioned comparison collation part 80 has.
Next, the self-diagnosis process executed by the comparison / matching unit 80 of the self-diagnosis circuit 90 will be described with reference to the flowchart of FIG. This process is executed when the power of the self-diagnosis circuit 90 is turned on.

First, an alternating signal is continuously input to the check coil 70, and geomagnetism based on the alternating signal is generated in the check coil 70 (S210).
The signal from the magnetic sensor 10 is collated with the alternating signal input to the check coil 70 (S220). If the synchronization of changes between the signal from the magnetic sensor 10 and the alternating signal input to the check coil 70 is not inconsistent (S230: No), it is determined that the magnetic sensor 10 is normal and the process returns to S220. On the other hand, if the synchronization of changes between the signal from the magnetic sensor 10 and the alternating signal input to the check coil 70 is inconsistent (S230: Yes), it is determined that the magnetic sensor 10 is out of order and this is indicated. The signal is transmitted to the outside (S240). Then return.

  According to the self-diagnosis circuit 90 configured in this way, it is diagnosed whether each component of the object detection device 1 is operating normally without installing a fixed object for diagnosis in the monitoring area. can do. In addition, when it is determined that each component of the object detection device 1 is not normal, a fail signal is ensured by operating the special signal light emitter, for example, so that the component immediately operates safely. be able to.

  (6) The magnetic sensor 10 may be installed outside the monitoring area. In this case, the magnetic sensor (reference sensor) 10 installed outside the monitoring area measures a magnetic field component generated by the current flowing through the rail and the overhead wire, and the control box 20 is installed outside the monitoring area. Based on the signal from 10 and the signal from the magnetic sensor 10 installed in another monitoring area, the vehicle existing in the monitoring area is detected.

  And when the control box 20 is a value where the difference between the signal from the magnetic sensor 10 installed outside the monitoring area and the signal from the magnetic sensor 10 installed in another monitoring area is larger than the threshold value It is determined that there is a car in the monitoring area. If both signal magnetic levels are different, correction may be made by multiplying one or both values by a predetermined constant.

  If comprised in this way, the influence of the magnetic field fluctuation | variation which generate | occur | produces with the electric current which flows through a rail or an overhead wire can be removed.

(A) is explanatory drawing which shows the level crossing where magnetic sensor 10 and magnetic sensor 10 were installed, (b) is explanatory drawing which shows a level crossing, (c) is object detection installed near level crossing 1 is a schematic configuration diagram of a device 1. FIG. It is explanatory drawing which shows distribution of the geomagnetism in the circumference | surroundings of a motor vehicle. 1 is a schematic configuration diagram of a magnetic sensor 10. FIG. 1 is a schematic configuration diagram (1) of an alarm generation device 100. FIG. It is a schematic block diagram (2) of the alarm generator 100. It is a flowchart explaining an alarm generation process. 2 is a schematic configuration diagram of a self-diagnosis circuit 90. FIG. It is a flowchart explaining a self-diagnosis process.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Object detection apparatus, 10 ... Magnetic sensor, 11 ... 1st sensor, 12 ... 2nd sensor, 13 ... 3rd sensor, 14 ... 1st AD conversion part, 15 ... 2nd AD conversion part, DESCRIPTION OF SYMBOLS 16 ... 3rd AD conversion part, 17 ... Signal processing circuit, 20 ... Control box, 30 ... Train approach detection part, 40 ... Train passage detection part, 50 ... Railroad crossing control apparatus, 60 ... Special signal light emitter, 70 ... Check Coil, 80 ... comparison / verification unit, 90 ... self-diagnosis circuit, 100 ... alarm generator

Claims (8)

A target detector of the transverse passage for detecting an object existing in the set surveillance area to include a transverse passage vehicles is installed in the running path of travel,
A magnetic sensor embedded in the monitoring region and measuring the distribution of geomagnetism at the embedded point;
Detection means for detecting an object present in the monitoring region based on a signal from the magnetic sensor;
Equipped with a,
The travel path is a track,
The crossing is a railroad crossing,
The monitoring area is set to include the railroad crossing as the crossing road,
The magnetic sensor measures a geomagnetic distribution in a direction parallel to the trajectory at the point where the magnetic sensor is buried . In the crossing object detection device according to claim 1,
There are a plurality of the magnetic sensors,
The plurality of magnetic sensors are arranged at a position where at least two of the plurality of magnetic sensors can simultaneously measure a geomagnetic change due to an object existing in the monitoring area. Object detection device. In the object detection apparatus of the crossing road of Claim 1 or Claim 2,
There are a plurality of the magnetic sensors,
At least a part of the plurality of magnetic sensors is embedded in the vicinity of a barrier installed in the monitoring area. In the object detection apparatus of the crossing path in any one of Claims 1-3,
The object detection device for a crossing road, wherein the magnetic sensor is installed so that its measurement range is within the monitoring area.   In the object detection apparatus of the crossing road in any one of Claims 1-4,
  The said magnetic sensor has a filter which removes a low frequency component from the measured geomagnetism, The object detection apparatus of the crossing path characterized by the above-mentioned.   In the object detection apparatus of the crossing road in any one of Claims 1-5,
  Magnetism generating means for generating magnetism into the monitoring area;
  Self-diagnostic means for determining whether or not each component of the object detection device in the crossing path is operating normally based on a signal from the magnetic sensor that measures the distribution of magnetism generated by the magnetism generation means. When,
  An object detection device for a crossing road, comprising:   In the object detection apparatus of the crossing path in any one of Claims 1-6,
  A reference sensor installed outside the monitoring area and capable of measuring a magnetic field component generated by a current flowing through a rail and an overhead wire,
  The detection means detects an object present in the monitoring area based on a signal from the magnetic sensor and a signal from the reference sensor.
  An object detection device for a crossing road characterized by.   In the object detection apparatus of the crossing road in any one of Claims 1-7,
  A crossing control information acquisition means for acquiring crossing control information used for crossing control from the outside,
  The detection means determines whether or not a railway vehicle as a vehicle has passed through the railroad crossing based on the railroad crossing control information acquired by the railroad crossing control information acquisition means, and the railcar passes through the railroad crossing road. If it is determined that the object has been detected, the reference value for detecting the object existing in the monitoring area is reset.
  An object detection device for a crossing road characterized by.