JP2003002196A - Movable body detection system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect movable body with a low-cost facilities, regardless of running speed of the movable body. SOLUTION: A ultrasound transmitting wheel 3 which transmits ultrasonic to the rail 6 of a vehicle 1 is loaded on the side of the vehicle 1, and a ultrasonic transducer 7 is attached to a certain location of the rail 6. When the vehicle 1 passes through at the point where the ultrasonic transducer 7 is attached, ultrasonic transmitted from the ultrasound transmitting wheel 3 is received by the ultrasonic transducer 7, and its level of the receiving output is detected by a level detection circuit 13 of an on-site device 10, and the vehicle is determined as passed by a processing device 8 based on an output of the level detection circuit 13 when it is above a certain level.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving body detecting system, and more particularly to a moving body detecting system suitable for detecting a moving body such as a railway vehicle whose traveling route is determined.

[0002]

2. Description of the Related Art A moving body whose traveling route is predetermined,
For example, a track circuit is generally used as a vehicle detection system for railway vehicles. However, when a train is detected by a check-in / check-out method such as a railroad crossing section, that is, by detecting the entry of the train at the entrance side of the railroad crossing section and the advance of the train at the exit side, In the case of detecting the presence / absence of a train, providing short and short track circuits at the entrances and exits of sections for point detection increases the equipment cost on the ground.

As an alternative train detection method to the track circuit, there is one disclosed in, for example, Japanese Patent Laid-Open No. 8-334560. This is to detect the presence of a train by mounting a sensor on a rail and sensing the sound waves and vibrations generated as the train runs.

[0004]

However, the above-mentioned detection method cannot detect the train because sound waves and vibrations do not occur when the train is stopped. In addition, since the level of sound waves and vibrations generated when the train is running at a low speed is low, the output level of the sensor decreases and the S / N ratio deteriorates. Therefore, the detection accuracy of the train decreases and the train cannot be detected. there is a possibility.

The present invention has been made in view of the above problems, and an object of the present invention is to provide a moving body detection system capable of surely detecting the moving body regardless of the running state of the moving body.

[0006]

Therefore, in the mobile object detection system according to the invention of claim 1, the laying member laid along the traveling route of the mobile object is used as the transmission medium, and the elastic wave is transmitted to the transmission medium. The transmitting means is mounted on the moving body side, while the receiving means for receiving the elastic wave transmitted to the transmission medium is installed at a predetermined position of the traveling route, and the predetermined time is set when the elastic wave reception output is generated from the receiving means. It is characterized in that it comprises a determination means for generating a moving body passage determination output of the position.

In such a structure, the elastic wave is transmitted from the transmitting means on the moving body side to the transmission medium, the elastic wave is received by the receiving means installed at a predetermined position on the ground side, and it is judged when the receiving output is generated from the receiving means. A moving body passage determination output is generated from the means, and it is detected that the moving body has passed a predetermined position.
Specifically, as in claim 2, the receiving means includes a sensor unit that abuts on a transmission medium and receives an elastic wave transmitted to the transmission medium to generate an output according to a reception level; and an output of the sensor unit. It may be configured to include a reception detection unit that generates the elastic wave reception output when the level is equal to or higher than a predetermined level.

[0008] Further, the reception detection section, as in claim 3, an amplification section for amplifying an output from the sensor section, and a filter section which passes only when a frequency of an output signal of the amplification section is a predetermined frequency, It is preferable that the filter section includes a level verification section that generates the elastic wave reception output when the output level of the filter section is equal to or higher than a predetermined value. In the invention of claim 4, the receiving means is installed at a moving body entrance side end portion and a moving body advance side end portion of a predetermined moving body detection section, and the determination means is such that the approach side receiving means is elastic. When the wave reception output is generated, the moving body entering the detection section is detected, and the advancing side receiving means detects the elastic body receiving output when the wave reception output is generated, and the entrance side receiving means is elastic. The moving body presence detection output in the detection section is generated from the generation of the wave reception output to the generation of the elastic wave reception output by the advancing side reception means.

With this configuration, it is possible to detect the presence / absence of a moving body in a predetermined section. According to a fifth aspect of the invention, when the inspection means for inspecting the normality / abnormality of the reception function of the reception means is provided, the reliability of the moving object detection system is improved. In the invention of claim 6,
When the receiving means is installed at both ends of the moving body detection section, the inspecting means moves from the entry side end of the moving body detection section to the advance side end and from the advance side end to the entry side end. Inspection signal transmitting means capable of switching and transmitting inspection elastic waves, and reception of the advancing side receiving means based on the output state of the advancing side receiving means when the inspection elastic waves are transmitted from the ingress side end to the ingress side end Whether the function is normal or abnormal is judged, and when the inspection elastic wave is transmitted from the advancing side end to the approaching side end, the normality / abnormality of the receiving function of the approaching side receiving means is determined based on the output state of the approaching side receiving means. A receiving function determining means for determining is provided.

With such a configuration, by transmitting the inspection elastic wave to the transmission medium when there is no moving body, it is possible to check the normality / abnormality of the receiving function of the approaching side receiving means and the approaching side receiving means in the moving body detection section. Like When the sensor unit of each of the receiving means has an elastic wave transmitting function as in the invention of claim 7, the inspection signal transmitting means is provided for each of the receiving means and generates the inspection elastic wave. The inspection signal generating means, each connection switching means which is provided for each receiving means and which selectively connects the inspection signal generating means and the reception detecting portion to the sensor section, and one of the connection switching means is inspected. And a control means for interlocking the two connection switching means with each other so as to connect the other connection switching means to the reception detecting section side when connecting to the signal generating means side. It is advisable to adopt a configuration in which the determination target of the reception function is determined based on the switching control command.

According to the eighth aspect, by providing a plurality of the moving body detection sections continuously, the moving body can be continuously detected. In this case, as in claim 9, one receiving means is installed at the boundary between the moving body detection sections adjacent to each other, and the one receiving means is used for detecting the advancing and entering of the moving body in the adjacent moving body detection sections. If the configuration is shared, the number of parts will be small and the equipment cost will be low.

According to a tenth aspect of the present invention, a confirming means for confirming that the transmitting function of the transmitting means mounted on the moving body is normal, and holding the normal state when the confirming means judges that the transmitting function is stopped. When the friction plate holding means for slidingly contacting the existing friction plate with the transmission medium is mounted on the moving body, the sliding contact sound is generated by the sliding contact between the friction plate and the transmission medium as the moving body travels. Like

In the moving body detecting system according to the invention of claim 11, when the laying member laid along the traveling path of the moving body is deformed by the pressing force from the moving body, an output according to the deformation amount is generated. The sensor means is installed at a predetermined position on the travel route, and is provided with a judging means for generating a moving body passing judgment output at the predetermined position when the output level of the sensor means is a predetermined value or more.

In such a structure, when the laying member laid along the traveling path of the moving body is, for example, a traveling rail, the traveling rail is flexibly deformed due to the weight of the moving body. Detect with. The sensor means generates an output according to the detected deformation amount, and when the output level is equal to or higher than a predetermined value, the determination means generates a moving body passage determination output.

According to a twelfth aspect of the present invention, the determining means is operated by a power supply section which is driven when the output level of the sensor means is a predetermined value or more, and a power supply from the power supply section when the power supply section is driven. With a signal generator that generates a signal,
It is preferable that the output signal of the signal generator is used as the moving body passage determination output. According to a thirteenth aspect of the present invention, a plurality of the sensor means are provided close to each other, and a function confirmation means for confirming the normal function of each of the sensor means and the determination means based on the outputs of the plurality of sensor means is provided. , The reliability of the moving object detection system is improved.

[0016] The function confirmation means is specifically defined by claim 1.
4, the output of the sensor means corresponding to one input terminal provided for each sensor means and the main AND means for performing the logical product operation of the sensor output is input, and the inversion of the AND means to the other input terminal. A plurality of sub-logical product means to which an output is input may be provided, and it may be configured such that there is an abnormality when an output is generated from at least one of the plurality of sub-logical product means.

According to a fifteenth aspect, the power supply section and the signal generating section are provided for each of the sensor means, the frequencies of the output signals of the respective signal generating sections are made different from each other, and the signal generating section corresponding to each signal generating section is provided. If a configuration is provided in which a filter unit that allows only the output signal of the above is passed and the outputs of the plurality of filter units are input to the main logical product unit and the sub logical product unit, the output from the signal generation unit can be wirelessly transmitted. It will be possible.

A piezoelectric sensor may be used as the sensor means. As the transmission medium and the laying member, traveling rails of a moving body may be used, respectively.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a configuration diagram of a first embodiment of a moving object detection system according to the present invention. In addition, in each of the following embodiments, an example in which the present invention is applied to detection of a railway vehicle will be described.

In FIG. 1, a vehicle 1 as a moving body is provided with an ultrasonic wave transmission wheel 3 for transmitting an ultrasonic wave as an elastic wave in addition to a normal wheel 2. The ultrasonic wave transmission wheel 3 has, for example, an ultrasonic wave oscillator 4 built in at the center of the wheel, and the ultrasonic wave oscillator 4 vibrates in response to an electric signal transmitted from a vehicle-mounted transmission circuit 5 to generate ultrasonic waves. The ultrasonic wave propagates in the wheel and is transmitted to the traveling rail 6 as a transmission medium for rotating the wheel. The ultrasonic wave transmitting wheel 3 may have a structure in which an ultrasonic transducer is provided around the wheel, as in JP-A-11-157446.
Here, the transmitting circuit 5 and the ultrasonic wave transmitting wheel 3 constitute a transmitting means.

At a predetermined position on the moving path of the vehicle 1, an ultrasonic transducer 7 serving as a sensor for receiving ultrasonic waves propagating through the rail 6 by contacting the side surface of the traveling rail 6 with, for example, a central depression. Is installed. Ultrasonic transducer 7
Generates a sensor output a according to the reception level of ultrasonic waves and inputs the sensor output a to the field device 10 as a reception detection unit. The field device 10 is installed in the vicinity of the ultrasonic oscillator 7 and passes only when the frequency of the output signal of the amplifier 11 and the amplifier 11 which is an amplification unit for amplifying the output a of the ultrasonic oscillator 7 is a predetermined frequency. A filter 12 and a level verification circuit 13 that generates the ultrasonic wave reception output b when the output from the filter 12 is equal to or higher than a predetermined level are provided. Here, the ultrasonic transducer 7 and the field device 10 constitute a receiving means. The ultrasonic wave reception output b of the field device 10 is input to the processing device 8 as a determination unit. The processing device 8 is installed, for example, in a remote central command station, and when the high-level ultrasonic wave reception output b is input from the field device 10, the processing device 8 generates a vehicle passage determination output c and confirms that the vehicle 1 has passed a predetermined position. report.

Next, the operation will be described. The vehicle 1 travels while constantly transmitting ultrasonic waves to the rails 6 from the ultrasonic wave transmitting wheels 3. When the vehicle 1 reaches the mounting position of the ultrasonic vibrator 7, the ultrasonic vibrator 7 receives the ultrasonic wave, and the ultrasonic vibrator 7 produces a sensor output a as shown in FIG. The output a is amplified by the amplifier 11 and input to the filter 12.
If the frequency of the signal input to the filter 12 is the same as the frequency of the transmission signal from the ultrasonic transmission wheel 3, the output is based on the ultrasonic signal from the vehicle 1, passes through the filter 12, and is input to the level verification circuit 13. Then, the high level ultrasonic wave reception output b is generated from the level verification circuit 13 as shown in FIG. The processor 8 always generates a high level output indicating the absence of the vehicle, but when the ultrasonic wave reception output b is input, it generates a low level vehicle passage determination output c as shown in FIG.
It notifies that the vehicle 1 has passed a predetermined position.

Since the propagation distance of the ultrasonic signal can be set by adjusting the output level and frequency of the ultrasonic signal transmitted from the ultrasonic transmission wheel 3, the vehicle 1 passes the mounting position of the ultrasonic transducer 7. It is possible to set so that an ultrasonic signal is received at the time of operation. According to the first embodiment, the passage of the vehicle 1 can be detected on the ground side regardless of the vehicle speed. Further, equipment such as a track circuit that constantly supplies a current signal to the rail is not required, and the equipment cost can be reduced.

Next, a second embodiment of the present invention for detecting the presence / absence of a vehicle in a predetermined detection section by using the moving body detection system of the first embodiment will be described. The same elements as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 3, the ultrasonic transducer 7A and the field device 10A are installed at the vehicle entrance side end of the predetermined detection section T,
The ultrasonic transducer 7B and the field device 10B are installed at the end of the vehicle advance side. The ultrasonic vibrators 7A and 7B are the same as the ultrasonic vibrator 7 of the first embodiment. The field devices 7A and 7B are also the same as the field device 10 of the first embodiment. The processing device 9 outputs the output signal c1 indicating the presence / absence of the vehicle in the detection section T based on the ultrasonic wave reception outputs b1 and b2 from the both field devices 10A and 10B.
The vehicle 1 is assumed to move in the direction of arrow A in FIG.

Next, the operation will be described. Vehicle 1 is the detection section T
When passing through the entry side end of the device, the high level ultrasonic reception output as shown in FIG. 4 from the field device 10A based on the sensor output from the ultrasonic transducer 7A in the same manner as described in the first embodiment. b1 is generated and input to the processing device 9. The processing device 9 detects the entry of the vehicle 1 into the detection section T by the input of the ultrasonic wave reception output b1, and the ultrasonic wave reception output b1 is detected.
The output signal c1 becomes low level as shown in FIG. The processing device 9 keeps the output signal c1 at a low level even after the vehicle 1 has passed through the approach-side end of the detection section T to notify the presence of the vehicle 1 in the detection section T.

When the vehicle 1 traveling in the detection section T passes through the end on the advancing side, a high level ultrasonic wave reception as shown in FIG. 4 is received from the field device 10B based on the sensor output from the ultrasonic vibrator 7B. An output b2 is generated and input to the processing device 9.
The processing device 9 detects the advance of the vehicle 1 from the detection section T by the input of the ultrasonic wave reception output b2, and outputs the output signal c as shown in FIG. 4 in synchronization with the fall of the ultrasonic wave reception output b2.
1 becomes a high level. As a result, the processing device 9 reports the absence of the vehicle 1 in the detection section T.

Next, in the configuration of the second embodiment, the ultrasonic transducers 7A, 7B on the ground side and the field devices 10A, 10B are arranged.
A third embodiment of the present invention in which the inspection function is added will be described. The same elements as those in the second embodiment are designated by the same reference numerals and the description thereof will be omitted. In FIG. 5, in-situ devices 10A ′ and 10B ′ of the present embodiment, in addition to the configuration of the second embodiment, inspection signal generation circuits 31A and 31B which are inspection signal generation means for generating ultrasonic waves for inspection, Sound wave oscillator 7A, 7B
For the inspection signal generation circuits 31A and 31B and the amplifier 1
It is provided with changeover switches 32A and 32B which are connection changeover means for selectively changing and connecting 1 and 11.

For example, a control device 33, which is a control means, is provided on the side of the central command station, and when one of the changeover switches 32A and 32B is connected to the inspection signal generating circuit side by the changeover command from the control device 33, the other is set to the amplifier side. Interlock with each other to connect. Further, the control device 33 controls driving of the inspection signal generation circuits 31A and 31B. In addition to the vehicle detection function described in the second embodiment, the processing device 30 of the present embodiment determines the inspection target of the reception function based on the drive state signals from the inspection signal generation circuits 31A and 31B based on the command from the control device 33. Then, it has a function of a receiving function judging means for judging whether the receiving function is normal or abnormal. Here, the inspection signal generation circuits 31A and 31B and the changeover switches 32A and 32
B and the control device 33 constitute inspection signal transmitting means, and the inspection signal transmitting means and the processing device 30 constitute inspection means for inspecting normality / abnormality of the receiving function.

Next, the operation will be described. The operation of detecting the presence / absence of the vehicle 1 in the detection section T is the same as that in the second embodiment, and a description thereof will be omitted. Here, a normal / abnormal inspection operation of the reception function will be described. For example, the control device 33 issues a change command to connect the changeover switch 32A to the inspection signal generation circuit 31A side. As a result, the changeover switch 32A is connected to the inspection signal generating circuit 31A side as shown by the solid line in the figure, and the changeover switch 32 is interlocked with this.
B is connected to the amplifier 11 side as shown by the broken line in the figure. In this state, the inspection signal generation circuit 31A is driven by the drive command from the control device 33 to generate the inspection ultrasonic wave. The inspection signal generation circuit 31A simultaneously transmits to the processing circuit 30 a signal indicating that it is being driven.

The ultrasonic wave for inspection generated by the inspection signal generating circuit 31A is transmitted from the ultrasonic transducer 7A to the rail 6, and propagates through the rail 6 to detect the ultrasonic wave at the advance end of the detection section T. The oscillator 7B is reached. Ultrasonic transducer 7
When B receives the inspection ultrasonic wave, the sensor output corresponding to the reception level is input to the amplifier 11. After that, filter 1
The frequency is discriminated at 2, and the level is verified by the level verification circuit 13. If the level is higher than a predetermined level, the high level output is input to the processing device 30 from the field device 10B '. Processor 30
Recognizes from the signal from the inspection signal generation circuit 31A that the inspection target is the ultrasonic transducer 7B and the field device 10B 'on the advancing side of the detection section T, and a high-level output is input from the field device 10B'. Therefore, the ultrasonic transducer 7B
And the field device 10B 'is determined to be normal. on the other hand,
When the high level signal is not input from the field device 10B ', the processing device 30 determines that the ultrasonic transducer 7B, the field device 1
It is determined that either 0B 'or the traveling rail 6 in the detection section T which is the transmission path of ultrasonic waves is abnormal.

In the case of inspecting the ultrasonic transducer 7A and the field device 10A 'on the entry side of the detection section T, the changeover switch 32 is similarly issued by a changeover command from the control device 33.
The ultrasonic waves for inspection are transmitted from the ultrasonic transducer 7B by switching and driving A and 32B, and the processing device 30 judges from the output state of the field device 10A '. The above-mentioned inspection is periodically executed when the vehicle 1 is not present.

As described above, according to the third embodiment, the normality / abnormality of the ultrasonic transducers 7A, 7B and the field devices 10A ', 10B' can be regularly inspected by a command from the center. The reliability can be improved. Then, if the inspection ultrasonic waves are alternately transmitted from the ultrasonic transducers 7A and 7B and the inspection is performed, the traveling rail 6 may be abnormal unless high-level output is input from both field devices 10A 'and 10B'. Since it can be determined that there is a high probability, it has the effect of being able to identify the location of the abnormal occurrence.

Next, a fourth embodiment of the present invention will be described in which detection sections are continuously provided to detect a vehicle. In the following, three detection sections T1 to T3 will be described, but it goes without saying that the number of continuous detection sections is not limited to this.
6, the ultrasonic transducers 7A to 7D and the field device 10
A'to 10D 'are the same as those in the third embodiment of FIG.
At the boundary between the adjacent detection sections T1 and T2, T2 and T3, the ultrasonic transducers 7B and 7C and the field devices 10B ′ and 1 are arranged.
0C 'is shared to detect advancing and entering of adjacent sections.
The field devices 10A 'to 10D' are connected to the same processing device 30 as in the third embodiment.

Next, the operation will be described. Vehicle 1 is the detection section T
When the ultrasonic transducer 7A receives the ultrasonic wave from the ultrasonic wave transmitting wheel 3 when passing through the entry side end of No. 1, a sensor output is generated, and the processing device 30 indicates that the vehicle 1 has entered the detection section T1. Then, as shown in FIG. 7, a low level vehicle presence detection output is generated for the detection section T1. When the vehicle 1 reaches the advancing side end of the detection section T1, the processing device 30 determines that the vehicle 1 has entered the detection section T2 due to the rise of the sensor output from the ultrasonic transducer 7B, and detects it as shown in FIG. A low level vehicle presence detection output is generated for the section T2. After that, when the sensor output from the ultrasonic transducer 7B falls,
The processing device 30 determines that the vehicle 1 has advanced from the detection section T1, and generates a high-level vehicle absence detection output for the detection section T1 as shown in FIG.

Similarly, when the vehicle 1 passes through the boundary between the detection sections T2 and T3, as shown in FIG. 7, with respect to the detection section T3 as the sensor output of the ultrasonic transducer 7C rises and falls. After the low level vehicle presence detection output is generated, the high level vehicle absence detection output is generated for the detection section T2. At the end of the detection section T3 on the advancing side, the sensor output of the ultrasonic transducer 7D generates a high-level vehicle absence detection output for the detection section T3. As described above, the vehicle 1 can be continuously detected in the plurality of detection sections.

Ultrasonic transducers 7A to 7D, field device 10
A'to 10D 'and traveling rails 6 in the detection sections T1 to T3
The inspection can also be performed by transmitting and receiving the inspection ultrasonic wave between the adjacent ultrasonic transducers as described in FIG. 5, and the reliability of vehicle detection can be improved. Next, a fifth embodiment of the present invention will be described which is provided with a confirmation unit that confirms whether or not the ultrasonic wave transmission function on the vehicle side is normal. still,
The same elements as those in the first embodiment shown in FIG. 1 are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 8, in the present embodiment, the ultrasonic wave transmitting wheel 3 of the vehicle 1 has a receiving ultrasonic wave transducer 41 built therein. The output of the ultrasonic transducer 41 is input to the function confirmation circuit 42. The function confirmation circuit 42 collates the drive state signal from the transmission circuit 5 with the output signal of the ultrasonic transducer 41 to confirm whether or not the transmission state is normal. The function confirmation circuit 42 drives and controls the holding mechanism 43. The holding mechanism 43 operates to hold the friction plate 44 by the normality confirmation signal from the function confirmation circuit 42, and stops the holding operation of the friction plate 44 when the input of the normality confirmation signal from the function confirmation circuit 42 is stopped.
The friction plate 44 is configured to drop on the tread surface of the rail 6 when the holding operation of the holding mechanism 43 is stopped.

Next, the operation will be described. When an ultrasonic wave is normally generated from the ultrasonic transducer 4 by the electric signal from the transmission circuit 5, the ultrasonic wave is transmitted to the rail 6 and simultaneously received by the receiving ultrasonic transducer 41. The reception output of the ultrasonic transducer 41 is input to the function confirmation circuit 42. The function confirmation circuit 42 determines that the transmission function is normal when the reception output is input while the signal indicating that the device is being driven is input from the transmission circuit 5, and outputs a normality confirmation signal to the holding mechanism 43. The holding mechanism 43 generates and holds the holding force of the friction plate 44 when the normality confirmation signal is input. The function confirmation circuit 42 determines that the transmission function is normal and outputs a normality confirmation signal to the holding mechanism 43 even when the reception output is not input while the signal indicating the operation stop is input from the transmission circuit 5.

On the other hand, if the reception output is not input while the signal indicating that the drive is in progress is input from the transmission circuit 5, it is determined that the transmission function has a failure, and the normality confirmation signal to the holding mechanism 43 is stopped. The holding mechanism 43 eliminates the holding force of the friction plate 44 by stopping the normality confirmation signal, and the friction plate 44 falls on the tread surface of the rail 6. When the friction plate 44 falls on the rail 6,
Sliding contact noise is generated between the rail 6 and the friction plate 44 as the vehicle 1 travels. When the ultrasonic transducer 7 receives this sliding contact sound, the presence of the vehicle 1 can be detected even when the ultrasonic wave transmission function on the vehicle 1 side fails and ultrasonic waves are no longer transmitted.

As the holding mechanism 43, for example, a structure for holding the friction plate 44 by an electromagnetic force such as an electromagnetic actuator or a structure for mechanically holding the friction plate 44 can be considered. In particular, a structure in which the holding force of the friction plate disappears when the holding mechanism itself fails is preferable. Next, a sixth embodiment of the present invention will be described in which the vehicle is detected by utilizing the deformation of the traveling rail due to the weight of the vehicle. The same elements as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.

In FIG. 9, a piezoelectric sensor 53 is installed between the sleepers 51, 51 of the traveling rail 6 on which the vehicle 1 travels as a sensor means which is fixed to the base 52 and generates an electrical output when a pressing force acts. . The piezoelectric sensor 53 is provided between the base 52 and the lower surface of the rail 6 without a gap. The sensor output a of the piezoelectric sensor 53 is input to the field device 54.
When the sensor output a of a predetermined level or more is input, the field device 54 sets the detection output b to a high level and notifies the central command station side (not shown) of the presence of the vehicle. In the present embodiment, the field device 54 has a function of a determination unit. In the figure, 2 is a wheel of the vehicle 1. In this embodiment, it is not necessary to provide the ultrasonic wave transmission wheel 3 on the vehicle 1.

Next, the operation will be described. When the vehicle 1 is not present, the rail 6 is substantially horizontal as shown by the solid line in the figure. When the vehicle 1 reaches the mounting position of the piezoelectric sensor 53, the weight of the vehicle acts on the rail 6 as a pressing force via the wheel 2, and the rail 6 is deformed downward as shown by the broken line in the figure to generate a strain δ. The piezoelectric sensor 53 is also distorted by substantially the same amount. As a result, the sensor output a of the voltage corresponding to the strain amount δ is input from the piezoelectric sensor 53 to the field device 54 as shown in FIG. 10. The field device 54 verifies the level of the input sensor output a, and if it is equal to or higher than the preset threshold value V _TH , the detection output b becomes high level and notifies the existence of the vehicle 1.

Also in the case of this embodiment, the presence of the vehicle 1 is detected by detecting the deformation amount of the rail 6 due to the vehicle weight, so that the vehicle can be detected regardless of the speed of the vehicle 1. next,
A seventh embodiment of the present invention will be described. In FIG. 11, the field device 60 of the present embodiment is a power supply unit 61 that is driven when the sensor output of the piezoelectric sensor 53 is equal to or higher than a predetermined level.
And a signal generator 62 that operates by power supply from the power supply unit 61 to generate a signal. The rest of the configuration is similar to that of the sixth embodiment shown in FIG. 9, and therefore its illustration is omitted.

In this embodiment, as shown in FIG. 12, when the output voltage of the piezoelectric sensor 53 becomes a predetermined value V ₀ or more, the power supply section 61 outputs the power supply voltage V1 to generate the signal generator 6.
Drive 2 As a result, a signal is generated from the signal generator 62 and the central command station is notified of the presence of the vehicle. When the output voltage of the piezoelectric sensor 53 is less than the predetermined value V _0, no output is generated from the power supply unit 61, the signal generator 62 stops its operation and does not output a signal. In this case, the central command station is notified of the absence of the vehicle.

According to such an embodiment, it is not necessary to lay a power supply line to the site where the field device 60 is installed, and if the output of the signal generator 62 is wireless, an external facility such as a central command center is installed. There is also an advantage that the signal line between and becomes unnecessary and the facility cost can be reduced. Next, the eighth aspect of the present invention
An embodiment will be described.

In this embodiment, the configuration of the seventh embodiment shown in FIG. 11 is configured in a dual system, and a function for confirming whether or not the sensor and the field device are normal is provided. In FIG. 13, the piezoelectric sensors 53A and 53B are installed close to each other as in the seventh embodiment of FIG. Field device 70
Are two power supply units 71A and 71B and two signal generators 7.
2A and 72B are provided. The signal generator 72A is a power supply unit 71.
A signal of frequency f1 is generated by the power supply from A, and a signal generator 72B generates a signal of frequency f2 by the power supply from the power supply unit 71B. Then, each signal generator 72
The outputs of A and 72B are wirelessly transmitted to, for example, the function confirmation circuit 80 installed at the central command station.

The function confirmation circuit 80 includes two band pass filters 81A and 81B, a main logical product circuit 82 which is a main logical product means, and a sub main logical product circuit 8 which is two sub logical product means.
3, 84. The outputs from the band pass filters 81A and 81B are input to the main logical product circuit 82 to generate a logical product output X. Further, the sub-logical product circuit 83 inputs the output from the band-pass filter 81A and an inverted signal of the logical product output X and generates a logical product output Y. The sub-logical product circuit 84 inputs the output from the band-pass filter 81B and the inverted signal of the logical product output X to generate a logical product output Z.

Next, the function confirmation operation will be described. Since the vehicle detecting operation is the same as that of the seventh embodiment shown in FIG. 11, its explanation is omitted. The deformation of the rail 6 due to the weight of the vehicle 1 is detected, and outputs are generated from the piezoelectric sensors 53A and 53B. Since the piezoelectric sensors 53A and 53B are installed close to each other, they are supposed to generate outputs at substantially the same time. Piezoelectric sensor 5
Power supply voltages are generated from the power supply units 71A and 71B by the outputs of 3A and 53B, and signals of frequencies f1 and f2 are generated from the signal generators 72A and 72B, respectively. Both of these signals are wirelessly received by the function confirmation circuit 80 of the central command center. In the function confirmation circuit 80, the band pass filter 81A
The signal of the frequency f1 of the signal generator 72A is input to the main logical product circuit 82 and the sub logical product circuit 83 via the. In addition, the signal generator 72B via the band pass filter 81B.
The signal of the frequency f2 is input to the main logical product circuit 82 and the sub logical product circuit 84, respectively.

The main logical product circuit 82 generates a high level logical product output X indicating a normal function when both signals of the frequencies f1 and f2 are input. At this time, both sub-logical product circuits 83, 8
The logical product outputs Y and Z of 4 become low level. On the other hand, when the function confirmation circuit 80 receives only the signal of the frequency f1, the logical product output X of the main logical product circuit 82 and the sub logical product circuit 84,
Z becomes low level, and the logical product output Y of the sub logical product circuit 83
Only high level. Thereby, the piezoelectric sensor 53
B, the power supply unit 71B, and the signal supply line on the side of the signal generator 72B can be determined to be defective. Conversely, when the function confirmation circuit 80 receives only the signal of the frequency f2, the logical product outputs X and Y of the main logical product circuit 82 and the sub logical product circuit 83 become low level, and the logical product output of the sub logical product circuit 84. Only Z goes high. As a result, the piezoelectric sensor 53A, the power supply unit 71A,
It can be determined that the signal supply line on the signal generator 72A side is out of order. When all the logical product outputs X to Z are at the low level, it can be determined that both signal supply lines have failed.

In the present embodiment, the detection signal is wirelessly transmitted from the field device 70 to the central command station, but it may be transmitted by wire. In this case, the signal frequencies of the signal generators 72A and 72B may be transmitted. The band pass filters 81A and 81B can be omitted.
In each of the above embodiments, the traveling rail 6 is used as the laying member that is deformed by the transmission medium of the ultrasonic signal or the pressing force from the vehicle.
However, the present invention is not limited to this, and in the case of a railway vehicle, an overhead wire for power supply or the like may be used. Needless to say, the moving body detection system of the present invention can be applied to any moving body whose travel route is determined in advance, not limited to a railway vehicle.

[0051]

As described above, according to the inventions of claims 1 to 3, since the elastic body transmitted from the moving body is received to detect the moving body, the moving body can be detected regardless of the traveling speed of the moving body. Can be detected. In addition, since equipment for supplying electric signals such as a track circuit is not required, equipment cost can be reduced.

According to the fourth aspect of the present invention, the presence / absence of a moving object in a predetermined detection section can be detected with low-cost equipment. According to the inventions of claims 5 to 7, the reliability of the moving object detection system can be improved. According to the invention of claim 8, it is possible to continuously detect the moving body in a plurality of detection sections, and it is possible to manage the operation of the moving body by the blocking system.

According to the invention of claim 9, in addition to the effect of claim 8, the number of parts of the ground side equipment can be reduced and the equipment cost can be reduced. According to the eleventh and sixteenth aspects of the present invention, it becomes possible to detect the moving body only by the equipment on the ground side regardless of the traveling speed of the moving body. According to the invention of claim 12, it is not necessary to lay a power supply line to the site.

According to the thirteenth and fourteenth aspects of the present invention, the reliability of the moving body detection system can be improved by the double system configuration.
According to the fifteenth aspect of the present invention, it becomes possible to transmit the detection output of the sensor means to a remote place wirelessly.
According to the seventeenth and eighteenth inventions, since the existing equipment is used for the transmission medium and the laying member, the equipment cost can be reduced.

[Brief description of drawings]

FIG. 1 is a configuration diagram of a first embodiment of the present invention.

FIG. 2 is an output time chart of the above embodiment.

FIG. 3 is a configuration diagram of a second embodiment of the present invention.

FIG. 4 is an output time chart of the above embodiment.

FIG. 5 is a configuration diagram of a third embodiment of the present invention.

FIG. 6 is a configuration diagram of a fourth embodiment of the present invention.

FIG. 7 is a time chart of vehicle detection output according to the above embodiment.

FIG. 8 is a configuration diagram of a fifth embodiment of the present invention.

FIG. 9 is a configuration diagram of a sixth embodiment of the present invention.

FIG. 10 is an output time chart of the embodiment.

FIG. 11 is a configuration diagram of a seventh embodiment of the present invention.

FIG. 12 is an output time chart of the above embodiment.

FIG. 13 is a main part configuration diagram of an eighth embodiment of the present invention.

[Explanation of symbols]

1 vehicle 3 Ultrasonic wave transmission wheels 4, 7, 41 ultrasonic transducer 5 Transmitter circuit 6 running rails 8, 9, 30 Processing equipment 10, 54, 60, 70 Field equipment 31A, 31B Inspection signal generation circuit 32A, 32B changeover switch 33 Control device 42, 80 Function confirmation circuit 43 holding mechanism 44 Friction plate 53 Piezoelectric sensor

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Claims (18)

[Claims] 1. A laying member laid along a traveling path of a moving body is used as a transmission medium, and a transmitting means for transmitting an elastic wave to the transmission medium is mounted on the moving body side, and elasticity transmitted to the transmission medium is provided. A receiving means for receiving waves is installed at a predetermined position of the traveling route, and a judging means for generating a moving body passing judgment output at the predetermined position when an elastic wave reception output is generated from the receiving means is provided. Mobile object detection system. 2. The sensor means for contacting a transmission medium to receive an elastic wave transmitted to the transmission medium to generate an output according to a reception level, and the output level of the sensor portion is a predetermined level or more. The mobile body detection system according to claim 1, further comprising a reception detection unit that sometimes generates the elastic wave reception output. 3. The reception detection unit includes an amplification unit that amplifies an output from the sensor unit, a filter unit that passes only when the frequency of an output signal of the amplification unit is a predetermined frequency, and an output level of the filter unit. The moving object detection system according to claim 2, further comprising: a level verification unit that generates the elastic wave reception output when the value is equal to or more than a predetermined value. 4. The receiving means is installed at each of a moving body entrance side end and a moving body advance side end of a predetermined moving body detection section, and the determining means is configured such that the approach side receiving means receives elastic waves. When the output is generated, the moving body entering the detection section is detected, and the advancing side receiving means receives the elastic wave. When the output is generated, the moving body advancing from the detection section is detected and the approach side receiving means receives the elastic wave. 4. The structure for generating a moving body presence detection output in the detection section from the time when the output is generated until the time when the advancing side receiving means generates the elastic wave reception output. Mobile object detection system. 5. The moving body detection system according to claim 1, further comprising an inspection unit that inspects the reception function of the reception unit for normality / abnormality. 6. When the receiving means is installed at both ends of the moving body detection section, the inspecting means moves from the entry side end to the exit side end and from the entry side end of the moving body detection section. Inspection signal transmitting means capable of switching and transmitting the inspection elastic wave to the entrance side end, and the advance based on the output state of the advance side receiving means when the inspection elastic wave is transmitted from the entrance side end to the exit side end The reception function of the entrance side reception means is determined based on the output state of the entrance side reception means when the normal / abnormal of the reception function of the side reception means is determined and the inspection elastic wave is transmitted from the advance side end to the entrance side end. 6. The moving body detection system according to claim 5, further comprising: a reception function determination means for determining normality / abnormality. 7. When the sensor section of each receiving means has a function of transmitting an elastic wave, the inspection signal transmitting means is provided for each receiving means and each inspection signal generating means for generating the elastic wave for inspection. Similarly, each connection switching means that is provided for each receiving means and selectively switches and connects the inspection signal generating means and the reception detecting portion to the sensor section, and one connection switching means on the inspection signal generating means side. Control means for interlocking both connection switching means with each other so as to connect the other connection switching means to the reception detection section side when connecting to the receiving function determining means, and the receiving function determining means is a switching control command of the control means. The moving object detection system according to claim 6, wherein the determination target of the reception function is determined based on the. 8. The moving body detection system according to claim 4, wherein a plurality of moving body detection sections are continuously provided. 9. A structure in which one receiving means is installed at a boundary between adjacent moving body detecting sections, and the one receiving means is shared for detecting the advancing and entering of moving bodies in the adjacent moving body detecting sections. The moving body detection system according to claim 8. 10. The confirmation means for confirming that the transmission function of the transmission means mounted on the moving body is normal, and the friction plate normally held when the confirmation means judges that the transmission function is stopped. The moving body detection system according to any one of claims 1 to 9, wherein the moving body is equipped with a friction plate holding means that slides on the transmission medium. 11. A sensor means for generating an output according to a deformation amount when a laying member laid along a traveling path of a moving body is deformed by receiving a pressing force from the moving body at a predetermined position of the traveling path. A moving body detection system, which is provided with a judging means for generating a moving body passing judgment output at the predetermined position when the output level of the sensor means is equal to or higher than a predetermined value. 12. The determination means operates when a power level of the sensor means is equal to or higher than a predetermined value, and a signal which operates when the power level is driven by power supply from the power source to generate a signal. The moving body detection system according to claim 11, further comprising: a generation unit, wherein an output signal of the signal generation unit is used as the moving body passage determination output. 13. A structure comprising a plurality of the sensor means provided close to each other, and a function confirmation means for confirming whether the functions of the sensor means and the judgment means are normal based on the outputs of the plurality of sensor means. Alternatively, the moving body detection system according to item 12. 14. The function confirmation means is provided with a main logical product means for performing a logical product operation of the sensor outputs, and an output of the sensor means corresponding to one input end provided for each sensor means and inputted to the other input end. 14. The configuration according to claim 13, further comprising: a plurality of sub-logical product means to which the inverted output of the logical product means is input, and when an output is generated from at least one of the plurality of sub-logical product means. Mobile object detection system. 15. The power supply section and the signal generating section are provided for each of the sensor means, the frequencies of the output signals of the respective signal generating sections are made different from each other, and only the output signal of the signal generating section corresponding to each signal generating section is passed. 15. The moving body detection system according to claim 14, wherein a filter unit for causing the plurality of filter units is provided, and outputs of the plurality of filter units are input to the main logical product unit and the sub logical product unit. 16. The moving body detection system according to claim 11, wherein the sensor means is a piezoelectric sensor. 17. The moving body detection system according to claim 1, wherein the transmission medium is a traveling rail of a moving body. 18. The moving body detection system according to claim 11, wherein the laying member is a traveling rail of a moving body.