JP2003006788A - Device and system for detecting mobile object - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a mobile object detector by which a mobile object can be detected without providing a private detection part and the detection information can be transmitted by radio. SOLUTION: A vehicle detection system 11 consists of a vehicle detector 12 and a managing place 13, and the vehicle detector 12 is provided with detecting radio equipment 14 and a control part 15. The radio equipment 14 is provided with a reception part 16, a transmission part 17 and an antenna 18. The managing place 13 is provided with managing-side radio equipment 19 and a computer 20. The computer 20 transmits an information data request signal as a prescribed signal or a dummy signal to respective vehicle detector 12 through a transmission part 22 all at the same level (the same intensity). The control part 15 of each vehicle detector 12 decides the presence/absence, velocity, etc., of the vehicle based on the level of a received signal by the reception part 16. The control part 15 temporarily stores detected information in a memory and when the reception part 16 receives the information data request signal from the managing place 13, prescribed information data are outputted to the transmission part 17.

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 device and a moving body detecting system, for example, for detecting a vehicle provided on a road for grasping traffic volume and transmitting the information to a management office. The present invention relates to a moving body detection device and a moving body detection system which are suitable for

[0002]

2. Description of the Related Art As a vehicle detection device 50 for detecting a vehicle traveling on a road and transmitting the information to a management office (base station), as shown in FIG. 2, a magnetic sensor 51 and a signal processing unit 5 are provided.
2 and the wireless device 53, the vehicle information detected by the magnetic sensor 51 is transmitted to the management station 54 by the wireless device 53.

Further, Japanese Patent Laid-Open No. 3-37796 discloses that
As shown in FIG. 3, an interrogator 56 installed at one end of a travel path (road) on which the mobile body 55 (vehicle) travels, and a specific code installed at the other end of the travel path facing the interrogator 56. And a transponder 57 storing therein a moving object identification device. Some of the moving bodies 55 are provided with another transponder 58, and some are not equipped with the transponder 58. In the moving body identifying apparatus, when the moving body 55 having the responder 58 passes by, the interrogator 56 reads the identification code of the moving body 55 as shown in FIG. To confirm. In addition, when the moving body 55 not equipped with the responder 58 passes through the position facing the responder 57, the moving body 55 shown in FIG.
As shown in, the presence of the moving body 55 is confirmed by cutting off the reception of the specific code of the transponder 57.

[0004]

However, in the conventional vehicle detection device 50 shown in FIG. 2, the detection unit (the magnetic sensor 51 or the like) for detecting the vehicle and the wireless device 5 for transmitting the detection information.
The two configurations of 3 and 3 are indispensable, and the scale of the circuit becomes large, and the size of the entire apparatus becomes large.

On the other hand, in the conventional apparatus disclosed in Japanese Patent Laid-Open No. 3-37796, the interrogator 56 and the responder 5 are used although the presence of the moving body 55 is confirmed by using a radio device.
Since the presence of the moving body 55 is detected by the round-trip communication with the wireless communication device 7, 58, two wireless devices (interrogator and transponder) are required as a detection unit, which makes it difficult to miniaturize the circuit. Further, since the interrogator 56 and the responder 57 are arranged so as to face each other across the traveling road, when detecting a vehicle at a plurality of vehicle detection locations, the interrogator 56 and the response are provided for each vehicle detection location. Vessel 57
It is necessary to dispose the above sets, and the configuration becomes complicated when configuring a system that manages the detection information of a plurality of detection devices at a management office.

Further, not only the vehicle detection device, but also a moving object detection device used for detecting an object to be transferred which is transferred by a transfer device such as a conveyor in a physical distribution system in an automatic warehouse or a factory is wireless. There is a similar problem when transmitting the detection information to the management computer.

The present invention has been made in view of the above problems. A first object of the present invention is to detect a moving body by using a wireless device without providing a dedicated detecting section. An object of the present invention is to provide a moving body detection device capable of wirelessly transmitting detection information. A second object is to provide a moving body detecting system using the moving body detecting device.

[0008]

In order to achieve the first object, the invention according to claim 1 is a detection radio device capable of transmitting / receiving to / from a radio device on the management side, and a radio device on the management side. And a determination unit that monitors the level of a predetermined signal transmitted from the wireless device and determines the state of the mobile unit based on the level of the predetermined signal.

According to the present invention, the level of the predetermined signal transmitted from the managing radio is monitored via the detecting radio. The level of the predetermined signal differs depending on whether the moving object is present near the detection radio device or not. Based on the level of the predetermined signal, the judgment means judges the presence / absence of the moving body, the moving speed, etc., and the detection information of the moving body based on the judgment result is transmitted from the detecting radio device to the managing radio device. . That is, since the detection wireless device functions as a detection part of the moving body and a wireless device for transmitting information, the size of the device can be reduced as compared with a configuration having a dedicated detection part.

According to a second aspect of the present invention, in the first aspect, the moving body is a vehicle that travels on a road. In the present invention, when used as a vehicle detection device that is installed on a road to grasp the traffic volume,
The size of the device can be reduced.

In order to achieve the second object, claim 3
The invention described in claim 1 is provided with a plurality of mobile object detection devices according to claim 1 or 2, and the predetermined signal is transmitted from a wireless device on the management side common to each mobile object detection device, and each mobile object is detected. The detection information is transmitted from the device.

According to the present invention, a plurality of moving body detecting devices are provided, and the level of the predetermined signal transmitted from the common managing side wireless device is monitored by the detecting wireless device of each moving body detecting device. Then, based on the level of the predetermined signal, the judging means judges the presence / absence of the moving body, the moving speed, and the like. Therefore, the system configuration is simplified even when the moving body is detected at a plurality of locations.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vehicle detection system embodying the present invention will be described below with reference to FIG.

As shown in FIG. 1, a vehicle detection system 11 as a moving body detection system is composed of a vehicle detection device 12 as a plurality of moving body detection devices and a management office 13. The vehicle detection device 12 includes a detection wireless device 14 and a control unit 15. The radio 14 for detection is the receiver 1
6, a transmitter 17 and an antenna 18 for transmission and reception. The receiver 16 serves to take out the information transmitted from the signal received by the antenna 18. Transmitter 17
Has the function of transmitting the detection information to be transmitted to the control station 13 by placing it on a carrier wave.

The management office 13 is provided with a radio device 19 and a computer 20 on the management side, and the radio device 19 is provided with a receiver 21, a transmitter 22 and an antenna 23. Radio 14 for detection
A directional antenna is used for the antenna 18 and a non-directional antenna is used for the antenna 23 of the control center 13.

The computer 20 outputs an information data request signal as a predetermined signal to each vehicle detection device 12 or a command to transmit a dummy signal to the transmission unit 22. The computer 20 transmits the information data request signal and the dummy signal so that either the information signal request signal or the dummy signal is transmitted from the transmission unit 22.
2 outputs a command signal.

The transmitter 22 is adapted to transmit the information data request signal and the dummy signal at the same level (same intensity). The receiving unit 21 receives the detection information data signal transmitted from each vehicle detection device 12, demodulates the detection information data signal, and sends it to the computer 20. The computer 20 grasps the traffic volume based on the detected information data signal.

The control unit 15 of each vehicle detection device 12 determines how the level state when the predetermined signal transmitted from the management office 13 reaches each vehicle detection device 12 changes depending on the traffic state of the vehicle. Is provided with a memory (not shown) in which calibration data obtained in advance by trial is stored. Then, the control unit 15 compares the level of the reception signal received by the reception unit 16 with the calibration data to determine the presence / absence of the vehicle, the speed, and the like. The control unit 15 temporarily stores the determination result in the memory as detection information, and when the receiving unit 16 receives the information data request signal from the management place 13, outputs predetermined detection information data to the transmitting unit 17. ing.

Next, the operation of the vehicle detection system 11 configured as described above will be described. Each vehicle detection device 12 is used by being buried below the road surface of the road, for example. Management office 1
A dummy signal or an information data request signal is transmitted from the transmitter 22 of No. 3. The reception unit 16 of each vehicle detection device 12 demodulates the received signal and sends it to the control unit 15. The control unit 15 monitors the level of the received signal and compares the level with the calibration data to determine the presence / absence of a vehicle, the speed, and the like. Then, the determination result is stored in the memory as detection information data. The detection information data includes the passing speed (traveling speed) of the vehicle, the size of the vehicle (discrimination between a large vehicle and a small vehicle), and the like.

Each vehicle detection device 1 is included in the information data request signal.
Since the ID data for identifying 2 is included, the control unit 15
When the information data request signal including its own ID data is sent from the receiving unit 16, outputs the predetermined detection information data to the transmitting unit 17. Then, the detection information data is carried on the carrier wave and transmitted from the antenna 18 to the management office 13. That is, the detection wireless device 14 also functions as a vehicle detection device.

The computer 20 of the control center 13 grasps the traffic volume based on the detection information data of the vehicle detection device 12, for example, the control information data such as the switching of the traffic light at the intersection between blue and red and the road. It is used as notification data of the congestion status of.

This embodiment has the following effects. (1) The vehicle detection device 12 includes a detection wireless device 14 that can transmit / receive data to / from the management-side wireless device 19, and the management-side wireless device 1.
The control unit 15 monitors the level of a predetermined signal transmitted from the control unit 9 and determines the presence or absence of a moving body (vehicle) based on the level of the predetermined signal. Therefore, the presence or absence of a moving body can be determined based on the level of the predetermined signal, and the detection wireless device 14 functions as a moving body detecting part and a wireless device for transmitting information, and therefore has a dedicated detecting part. The size of the device can be made smaller than that of.

(2) Since the vehicle detection device 12 is buried under the road surface, the level of the predetermined signal received by the receiver 16 when the vehicle passes the road surface is greatly reduced, and the level is lowered by the passage of the vehicle. It is easy to discriminate between the level decrease due to noise and noise. Further, it becomes easy to secure the installation place.

(3) Since the directional antenna is used as the antenna 18, the receiving unit 16 is less likely to pick up a noise signal as compared with the case where an antenna having no directivity is used. (4) The common predetermined signal transmitted from the management office 13 is received by the plurality of vehicle detection devices 12, and the presence or absence of the vehicle is determined based on the level of the predetermined signal. Therefore, even when the vehicle detection device 12 is provided at a plurality of locations, the predetermined signal may be output from only one location, and the vehicle detection system 11 uses the moving body identification device disclosed in Japanese Patent Laid-Open No. 3-37796. It will be easier compared to the case.

(5) The control unit 15 temporarily stores the detection information data in the memory, and when the information data request signal from the management office 13 is received, the detection information data is transmitted to the detection radio unit 1.
4 to the management office 13. Therefore, as compared with the configuration in which the detection information data is transmitted to the management office 13 every time the vehicle is detected, it is possible to secure a longer time for the detection wireless device 14 to function as the detection unit.

(6) An information data request signal from the control center 13 is also used as the predetermined signal used for detecting the vehicle. Therefore, the predetermined signal can be always transmitted from the management office 13 with a simple configuration.

The embodiment is not limited to the above, but may be configured as follows, for example. The control unit 15 may be configured to store the detection information data in a memory and transmit the detection information data to the management office 13 at predetermined time intervals. In the case of this configuration, when a large number of vehicle detection devices 12 are present, the transmission time is set in advance so that the transmission times of the vehicle detection devices 12 do not overlap, so that the management office 13 can detect the vehicle detection devices 12. It is possible to smoothly collect information from 12. Moreover, there is no possibility that the detection data cannot be received by the management office 13 because the detection data is simultaneously transmitted to the management office 13 from a large number of vehicle detection devices 12.

The information data request signal may not be used as the predetermined signal, and a predetermined signal having a constant level different from the information data request signal may be always output from the management office 13. In this case, when the information data request signal is output, it is transmitted by being superimposed on the predetermined signal. Further, the detection information data may be transmitted from the vehicle detection device 12 side according to a predetermined condition such as every predetermined time or when a predetermined number of vehicles are detected.

The vehicle detection device 12 may be configured to transmit detection information data to the management office 13 every time a vehicle is detected. The location of the vehicle detection device 12 is not limited to the lower part of the road surface, it does not hinder the passage of the vehicle, and the level at which the predetermined signal transmitted from the management station 13 is received by the reception unit 16 is the presence or absence of the vehicle. The position may be different depending on. In this case, as compared with the case of being buried in the road surface, it is not necessary to dig up the road and the installation becomes easier.

○ 1 without installing a plurality of vehicle detection devices 12
May be individual. The invention is not limited to the vehicle detection device 12, and may be applied to a transported object detection device that detects a transported object transported by a transporting means such as a conveyor in a physical distribution system. For example, in a physical distribution system provided with a transport path having a large number of branch parts by combining a plurality of conveyors, a transported object detection device as a moving object detection device for detecting the transported object is arranged near each branch part. . Then, the information about the transported object detected by the transported object detection device is wirelessly transmitted to the management computer. In this case as well, the transported object detection device performs the function of the detected wireless device for detecting the transported object and the function of transmitting the detection information data to the management computer.
The circuit configuration can be downsized.

The antenna 23 of the management office 13 may be a directional antenna. The vehicle is not limited to a vehicle that travels on a road, and may be applied to a vehicle detection device that detects a carrier vehicle that travels a predetermined route in a factory or a warehouse.

The technical idea (invention) that can be understood from the above-described embodiment will be described below. (1) In the invention described in claim 1, the moving body is a transported body transported by a transporting means in a physical distribution system.

(2) The moving object detecting device according to any one of claims 1, 2 and (1) is provided with a storage means for storing the detection information data, and temporarily stores the detection information data, If necessary, the detection information data is transmitted from the detection radio device. In the present invention, since the detection information data is temporarily stored in the storage means, it is not necessary to send the data to the management office immediately after the detection, and the data can be sent to the management office or the like upon request from the management office or at an appropriate time.

(3) In the invention according to any one of claims 1, 2 and (1), the detection radio transmits the detection information data to a radio on the management side every time a moving body is detected. Send. In the present invention, the storage means for storing the detection information data is unnecessary or the storage capacity can be small.

In this specification, the moving body is not limited to a structure in which the moving body itself is equipped with moving means, such as an automobile, but it is conveyed by a conveying means such as a belt conveyor or a roller conveyor. An object that cannot be moved by itself like a body and is moved (conveyed) by the action of an appropriate conveying means, or an object that can be moved manually by a person such as a push cart is included.

[0036]

As described above in detail, according to the first and second aspects of the present invention, a moving body can be detected without providing a dedicated detecting section, and the detected information is transmitted wirelessly. can do. According to the invention of claim 3,
Even when a plurality of moving body detection devices are used to detect moving bodies at a plurality of locations, the system configuration is simplified.

[Brief description of drawings]

FIG. 1 is a block diagram of a vehicle detection device according to an embodiment.

FIG. 2 is a block diagram of a conventional vehicle detection device.

FIG. 3 is a schematic diagram of another conventional moving body identification device.

[Explanation of symbols]

11 ... Vehicle detection system as a moving body detection system,
12 ... Vehicle detection device as a moving body detection device, 14 ... Detection radio device, 15 ... Control unit as determination means, 19 ... Management radio device.

Claims (3)

[Claims] 1. A detection wireless device capable of transmitting and receiving data to and from a management-side wireless device and a level of a predetermined signal transmitted from the management-side wireless device are monitored, and movement is performed based on the level of the predetermined signal. A moving body detection device, comprising: a determination unit that determines the state of the body. 2. The moving body detection device according to claim 1, wherein the moving body is a vehicle traveling on a road. 3. A plurality of mobile object detection devices according to claim 1 or 2, wherein a plurality of mobile object detection devices are provided, and the predetermined signal is transmitted from a wireless device on the management side common to each mobile object detection device. Mobile detection system that sends detection information from.