JP5100516B2 - Monitoring information collection terminal and equipment maintenance inspection system - Google Patents

Description

The present invention relates to a monitoring information collection terminal and a facility maintenance inspection system that monitor a state of a maintenance monitoring object using a radio signal as a transmission means.

  Maintenance inspection work on structures as social infrastructure is indispensable for realizing a safe and secure society. In order for the user to enjoy an inexpensive service, it is essential to reduce the cost related to the maintenance and inspection work. As in Patent Document 1, a technique for performing maintenance and inspection work without using a human hand by using a sensor as a technique for cost reduction has been recently studied.

Below, the method shown by patent document 1 is demonstrated.
FIG. 9 is a schematic block diagram showing a configuration of a conventional facility maintenance inspection system. The embodiment shown in FIG. 9 relates to maintenance and inspection work for a pump that performs drainage. The conventional facility maintenance inspection system manages the drainage station 9 that is a maintenance monitoring target, the monitoring information collection terminal 93 that transmits the excitation signal that is a transmission request for measurement information, and receives the measurement information, and the drainage station 9. And a facility management center 94 for performing the operation. The drainage station 9 includes a drain groove control device 91 that controls the pump and a pump 92. The pump 92 includes an engine 921, a speed reducer 922, and a pump main body 923. The devices 921, 922, and 923 constituting the pump 92 respectively receive antennas 9211, 9212, and 9213 that receive excitation signals and transmit measurement information. Measurement control units 9212, 9222, and 9232 for maintenance and inspection, storage units 9213, 9223, and 9233, and sensors 9214, 9224, and 9234 are provided.

The sensors 9214, 9224, and 9234 measure the states of the devices 921, 922, and 923 provided, and store them in the storage units 9213, 9223, and 9233, respectively. Next, the monitoring information collection terminal 93 is stored in the storage units 9213, 9223, and 9233 when the monitoring information collection terminal 93 exists at a position where wireless communication can be performed with the devices 921, 922, and 923 that are measurement targets. The excitation signal for requesting transmission of the measurement information is transmitted to the measurement control units 9212, 9222, and 9232 of the devices 921, 922, and 923. When the monitoring information collection terminal 93 transmits the excitation signal, each measurement control unit 9212, 9222, 9232 acquires the excitation signal received by the antennas 9211, 9212, 9213. When the measurement control units 9212, 9222, and 9232 acquire the excitation signals, the measurement information stored in the storage units 9213, 9223, and 9233 is transmitted to the monitoring information collection terminal 93 from the antennas 9211, 9212, and 9213 as radio signals. To do. When the measurement control units 9212, 9222, and 9232 transmit the measurement information, the monitoring information collection terminal 93 receives the measurement information and stores the received measurement information in the monitoring information collection terminal 93 or stores the received measurement information in the facility It transmits to the management center 94 by a radio signal.
As a result, maintenance personnel can perform maintenance inspections by having the monitoring information collection terminal 93 and passing through the vicinity of the maintenance monitoring object without human beings visually observing the maintenance monitoring object. Reduction can be realized.
JP 2004-102765 A

  As described above, the measurement control unit included in each of the devices 921, 922, and 923 that are measurement targets transmits measurement information after receiving the excitation signal of the monitoring information collection terminal 93. In order to reduce costs related to maintenance operations, it is essential to increase the amount of measurement information received by the monitoring information collection terminal 93 per unit time. For this purpose, it is necessary to move the monitoring information collection terminal 93 at high speed. However, when the operation of the measurement control units 9212, 9222, and 9232 is slower than the moving speed of the monitoring information collection terminal 93, monitoring is performed during a period until the excitation signal is received and the measurement information can be transmitted. It is assumed that the information collection terminal 93 moves to a position where wireless communication with the devices 921, 922, and 923 that are measurement targets cannot be performed.

  In order to solve this problem, by increasing the processing capability of the measurement processing units 9212, 9222, and 9232, a method for shortening the period until transmission is possible, or by increasing the transmission power of the radio signal, the monitoring information A method of expanding the range in which wireless communication with the collection terminal 93 can be considered is conceivable. However, in a maintenance system using sensors, a self-supporting power source, that is, a battery is often used. In this case, it is indispensable to reduce power consumption in the maintenance measurement system. In addition, passive RFID (Radio ID: Radio Frequency Identification) may be used to solve the power supply problem. However, since passive RFID generally has a very short communication distance, measurement information mounted on a moving object Not suitable for collection. In addition, until the monitoring information collection terminal 93 receives the measurement information, the monitoring information collection terminal 93 waits within a range where wireless communication with the measurement processing units 9212, 9222, and 9232 can be performed, and the time during which the measurement information can be transmitted is set. Assuming that the moving speed of the monitoring information collecting terminal 93 is decelerated can be considered. However, if the number of maintenance monitoring objects to be measured is enormous, a long waiting time corresponds to a reduction in the amount of measurement information received by the monitoring information collection terminal 93 per unit time, thus reducing costs. The effect will fade.

The present invention has been made in view of the above points, and an object of the present invention is to provide a monitoring information collection terminal and an equipment maintenance inspection system that can receive a large amount of measurement information per unit time by moving at high speed. Is to provide.

The present invention has been made to solve the above-described problems, and transmits measurement information indicating the state of the maintenance monitoring target, measures the state of the maintenance monitoring target, a receiving antenna, and the reception A receiving unit that receives an excitation signal that is a transmission request for the measurement information from an antenna, a transmission antenna, and the transmission antenna that converts the measurement information indicating the state of the maintenance monitoring object measured by the sensor into a radio signal. A monitoring information collecting terminal that communicates with a measuring device that transmits from the monitoring information collecting terminal, the monitoring information collecting terminal being provided in a moving body, and transmitting the excitation signal in advance before the measuring device Receives the excitation signal, and the measurement device transmits measurement information, so that a reception time indicating a time until the measurement information can be received from the measurement device; An inter-antenna distance representing a distance of a component parallel to the traveling direction of the moving body between the antenna and the transmitting antenna, and the monitoring information collecting terminal antenna at a place where the moving body is closest to the receiving antenna A reception antenna installation distance indicating a distance to the reception antenna, a transmission antenna installation distance indicating a distance from the monitoring information collection terminal antenna to the transmission antenna in a place where the mobile body is closest to the transmission antenna, and the movement A receiving antenna installation direction indicating a direction in which the receiving antenna exists when viewed from the mobile body when the body passes through the receiving antenna, and the mobile station when viewed from the mobile body when the mobile body passes through the transmission antenna. a parameter storage unit for storing the transmitting antenna installation direction indicating a direction in which the transmitting antenna is present, the directivity A monitoring information collecting terminal antenna, an excitation signal transmitting unit for transmitting the excitation signal from the monitoring information collecting terminal antenna, a measurement information receiving unit for receiving the measurement information from the monitoring information collecting terminal antenna, and the monitoring information collecting A directivity control unit that controls the direction of the directivity of the terminal antenna, a transmission / reception switching unit that switches transmission / reception from the monitoring information collection terminal antenna for each reception time, and a speed acquisition unit that acquires a moving speed of the mobile object The directivity control unit has a directivity of the monitoring information collection terminal antenna facing a direction of the reception antenna when the transmission / reception switching unit switches the monitoring information collection terminal antenna to transmission, and the transmission / reception unit When the switching unit switches the monitoring information collection terminal antenna to reception, the directivity of the monitoring information collection terminal antenna is the transmission antenna. Of the monitoring information collection terminal antenna based on the moving distance obtained by multiplying the reception time and the moving speed, the distance between antennas, the receiving antenna installation distance and the transmission antenna installation distance so as to face the direction of The directivity angle is controlled, and the directivity direction of the monitoring information collection terminal antenna is controlled based on the reception antenna installation direction and the transmission antenna installation direction .

  The monitoring information collection terminal antenna according to the present invention includes an excitation signal transmission antenna that transmits the excitation signal and a measurement information reception antenna that receives the measurement information, and the excitation signal transmission antenna and the antenna The measurement information receiving antenna has different directivities.

Further, the present invention is an equipment maintenance inspection system comprising a measuring device that transmits measurement information indicating a state of a maintenance monitoring object, and a monitoring information collection terminal that receives the measurement information, wherein the monitoring information collection terminal is The measurement information is received from the measurement device by transmitting the excitation signal in advance, the measurement device receiving the excitation signal, and the measurement device transmitting measurement information. A reception time indicating a time until reception is possible, an inter-antenna distance indicating a distance of a component parallel to a traveling direction of the mobile body between the reception antenna and the transmission antenna, and the mobile body receives the reception A receiving antenna installation distance indicating a distance from the monitoring information collecting terminal antenna to the receiving antenna at a place closest to the antenna; and A transmission antenna installation distance indicating a distance from the monitoring information collection terminal antenna to the transmission antenna in a place closest to the receiver, and the reception antenna as viewed from the mobile body when the mobile body passes through the reception antenna A parameter storage unit for storing a reception antenna installation direction indicating a direction in which the transmission antenna is present, and a transmission antenna installation direction indicating a direction in which the transmission antenna is present when viewed from the mobile body when the mobile body passes through the transmission antenna; , receiving a monitoring information collection terminal antennas with an excitation signal transmitting unit that transmits an excitation signal is a transmission request of the measurement information from the monitoring information collection terminal antenna, the measurement information from the monitoring information collection terminal antenna a measurement information receiving unit that, the directivity control unit for controlling the directivity of the orientation of the monitoring information collection terminal antenna, before A reception switching unit for switching transmission and reception from the monitoring information collection terminal antenna for each reception time, anda speed acquiring unit configured to acquire a moving speed of the moving body, the directivity control unit, the reception switching section When the monitoring information collection terminal antenna is switched to transmission, the directivity of the monitoring information collection terminal antenna is directed to the reception antenna of the measuring device, and the transmission / reception switching unit switches the monitoring information collection terminal antenna to reception In addition, a moving distance obtained by multiplying the receiving time and the moving speed so that the directivity of the monitoring information collecting terminal antenna is directed to the transmitting antenna of the measuring device, the distance between the antennas, and the installation of the receiving antenna The angle of directivity of the monitoring information collection terminal antenna is controlled based on the distance and the installation distance of the transmission antenna, and the reception antenna is The direction of directivity of the monitoring information collection terminal antenna is controlled based on the antenna installation direction and the transmission antenna installation direction, and the measuring device measures a state of the maintenance monitoring object, a receiving antenna, A receiving unit that receives the excitation signal from a receiving antenna; a transmitting antenna; and a transmitting unit that converts the measurement information indicating the state of the maintenance monitoring object measured by the sensor into a radio signal and transmits the radio signal from the transmitting antenna. It is characterized by providing.

According to the present invention, when the monitoring information collecting terminal transmits the excitation signal, the directivity of the monitoring information collecting terminal antenna is directed to the direction of the receiving antenna of the measuring device, thereby allowing the distance between the monitoring information collecting terminal and the measuring device. High-quality wireless communication can be performed even if is remote. As a result, the excitation signal can be received by the measurement device earlier than the conventional method. When the monitoring information collection terminal receives the measurement information, the monitoring information collection terminal receives the measurement information farther than the conventional method by directing the antenna directivity toward the transmission antenna of the measurement device. Is possible.
Further, according to the present invention, transmission / reception is performed based on the time obtained by dividing the distance from the position where the monitoring information collecting terminal has transmitted the excitation signal to the position where the measurement information can be received by the speed of the moving object. By switching, it is possible to ensure that the directivity of the monitoring information collection terminal is directed to the direction of the transmission antenna of the measurement device when the measurement device transmits measurement information. Thereby, it is possible to improve the certainty of reception of measurement information.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
FIG. 1 is a schematic block diagram showing the configuration of an equipment maintenance inspection system according to an embodiment of the present invention. The equipment maintenance / inspection system 1 according to the present embodiment includes a monitoring information collection terminal 110 and a measuring device 140.
The monitoring information collection terminal 110 includes a monitoring information collection terminal antenna 111 having directivity, and is mounted on the moving body 120. Here, the moving body 120 assumes a passenger car, for example, and moves at high speed. Also, it is assumed that the monitoring information collection terminal 110 can acquire power from the moving body 120, and the power is sufficiently secured. The monitoring information collection terminal 110 has a function of transmitting and receiving radio signals from the monitoring information collection terminal antenna 111.
The measurement device 140 includes a reception unit 141, a sensor 142, a measurement information storage unit 143, a transmission unit 144, a reception antenna 145, and a transmission antenna 146, and is installed on the maintenance monitoring target 130. The reception unit 141 has a function of receiving an excitation signal that is a transmission request for measurement information from the reception antenna 145. The sensor 142 has a function of measuring the state of the maintenance monitoring object 130 and storing measurement information indicating the measured state in the measurement information storage unit 143. The transmission unit 144 has a function of converting the measurement information stored in the measurement information storage unit 143 and the measurement information measured by the sensor 142 into a radio signal and transmitting it from the transmission antenna 146.

  FIG. 2 is a schematic block diagram showing the configuration of the monitoring information collection terminal 110. As shown in FIG. The monitoring information collection terminal 110 includes a monitoring information collection terminal antenna 111, an excitation signal transmission unit 112, a measurement information reception unit 113, a monitoring information storage unit 114, a directivity control unit 115, a transmission / reception switching unit 116, a speed An acquisition unit 117 and a parameter storage unit 118 are provided. The excitation signal transmission unit 112 has a function of transmitting an excitation signal from the monitoring information collection terminal antenna 111. The measurement information receiving unit 113 has a function of receiving measurement information from the monitoring information collecting terminal antenna 111 and storing it in the monitoring information storage unit 114. The directivity control unit 115 has a function of controlling the directivity direction of the monitoring information collecting terminal antenna 111. The transmission / reception switching unit 116 has a function of switching transmission / reception of radio signals from the monitoring information collecting terminal antenna 111. The speed control unit 117 has a function of acquiring the moving speed of the moving body 120.

FIG. 3 is a schematic block diagram showing the configuration of the monitoring information collection terminal antenna 111. As shown in FIG. The monitoring information collection terminal antenna 111 is an adaptive array antenna including a plurality of array antenna elements 1111-1 to 1111-A, weighting circuits 1112-1 to 1112-A, and a combining / distributing circuit 1113.
When the monitoring information collection terminal 110 transmits a signal, the combining / distributing circuit 1113 distributes the signal output from the monitoring information collection terminal 110 to A pieces. When the combining / distributing circuit 1113 distributes the signal, the weighting circuits 1112-1 to 1112-A respectively set the weighting factors w1 to w1 for setting the directivity direction of the monitoring information collecting terminal antenna 111 to the signals distributed by the combining / distributing circuit 1113. Apply wA. When the weighting circuits 1112-1 to 1112-A weight the signals, the array antenna elements 1111-1 to 1111-A transmit the signals weighted by the weighting circuits 1112-1 to 1112-A, respectively.
When the monitoring information collection terminal 110 receives a signal, when the array antenna elements 1111-1 to 1111-A receive the signal, the weighting circuits 1112-1 to 1112-A respectively receive the array antenna elements 1111-1 to 1111-A. Multiplies the received signals by weighting factors w1 to wA. When the weighting circuits 1112-1 to 1112-A weight the signals, the combining / distributing circuit 1113 combines the signals weighted by the weighting circuits 1112-1 to 1112-A.
Accordingly, the monitoring information collection terminal antenna 111 has directivity, and the directivity control unit 115 controls the directionality of the monitoring information collection terminal antenna 111 by controlling the weighting factors w1 to wA.

  In the equipment maintenance inspection system 1 according to this embodiment, the monitoring information collection terminal 110 provided in the moving body 120 is provided with a plurality of maintenance monitoring objects 130 installed in the path by the moving body 120 passing through a predetermined path. It collects measurement information. Note that the reception antennas 145 and the transmission antennas 146 in the plurality of maintenance monitoring objects 130 are all attached in the same direction as viewed from the moving body 120. Thereby, when the moving body 120 approaches the maintenance monitoring object 130, if the monitoring information collection terminal 110 directs the directivity of the monitoring information collection terminal antenna 111 in the approaching direction, that is, the traveling direction of the moving body 120, The receiving antenna 145 can eventually receive the excitation signal. Further, when the moving body 120 moves away from the maintenance monitoring object 130, the monitoring information collecting terminal 110 changes the directivity of the monitoring information collecting terminal antenna 111 in the reverse direction, that is, the moving direction of the moving body 120. If directed, the monitoring information collecting terminal antenna 111 can receive the measurement information.

Hereinafter, the operation of the monitoring information collection terminal 110 shown in FIG. 2 will be described.
In this embodiment, the reception distance L indicating the distance from the position where the excitation signal is transmitted to the position where the measurement information can be received in the parameter storage unit 118 of the monitoring information collection terminal 110 in advance, and the traveling direction of the moving body 120 , The reception antenna installation direction a _r and the transmission antenna installation direction a _s , which are directions in which the reception antenna 145 and the transmission antenna 146 exist, are stored. The reception antenna installation direction a _r and the transmission antenna installation direction a _s are directions in which the reception antenna 145 and the transmission antenna 146 exist when viewed from the mobile unit 120 when the mobile unit 120 passes the reception antenna 145 and the transmission antenna 146. That's it. For example, when the moving body 120 passes below the reception antenna 145, the reception antenna installation direction _ar is upward. The reception distance L, the reception antenna installation direction a _r, and the transmission antenna installation direction a _s are parameters that are known by measuring in advance.

FIG. 4 is a flowchart showing the operation of the monitoring information collection terminal 110. The speed acquisition unit 116 communicates with the moving body 120 and acquires the moving speed v of the moving body 120 (step S1). When the speed acquisition unit 116 acquires the movement speed v, the transmission / reception switching unit 116 calculates the transmission / reception switching time t based on the reception distance L and the movement speed v stored in the parameter storage unit 118 (step S2). The transmission / reception switching time t can be obtained by calculating L / v. That is, the transmission / reception switching time t indicates the time taken to move the reception distance L at the moving speed v. When reception switching section 116 calculates the reception switching time t, the directivity control unit 115, in a direction inclined to the receiving antenna installation direction a _r a directivity of monitoring information collection terminal antenna 111 the traveling direction of the moving body 120 as a reference Directed, that is, when the monitoring information collection terminal 110 is in a range where wireless communication with the reception antenna 145 can be performed, the directivity of the monitoring information collection terminal antenna 111 faces the direction of the reception antenna 145 (step S3). . Next, to measure the transmission time t _s which indicates the time elapsed from the time towards the directivity of the monitoring information collection terminal antenna 111 to the receive antenna installation direction a _r (step S4).

Transmission time t _s does not reach the reception switching time t (step S5), and the excitation signal transmitting section 112 continues to periodically send an excitation signal from the monitoring information collection terminal antenna 111 (step S6). Transmission time t _s is to reach the reception switching time t, to continue the process of step S5. Transmission time t _s reaches the reception switching time t, the directivity control unit 115, based on the reverse traveling direction of the moving body 120 the directivity of the monitoring information collection terminal antenna 111 to the transmitting antenna installation direction a _s The direction of the monitoring information collection terminal antenna 111 is directed to the direction of the transmission antenna 146 when the monitoring information collection terminal 110 is in a range where wireless communication with the transmission antenna 146 is possible. (Step S7). Next, to measure the reception time t _r indicating the elapsed time since with its directivity of monitoring information collection terminal antenna 111 to the transmitting antenna installation direction a _s (step S8).

Reception time t _r does not reach the reception switching time t (step S7), and measurement information receiving unit 113 waits for reception of the measurement information from the monitoring information collection terminal antenna 111. When the measurement information receiving unit 113 receives the measurement information (step S8), the measurement information receiving unit 113 stores the measurement information in the monitoring information storage unit 114 (step S9). Reception time t _r reaches the reception switching time t, it performs the processing in and after step S3.

In the present embodiment, the reason why the transmission / reception switching time t is set to L / v will be described.
When the monitoring information collection terminal 110 starts transmitting the excitation signal at time 0 and switches between transmission and reception at intervals of time s, the monitoring information collection terminal 110 stops transmitting the excitation signal at time s and waits for reception of measurement information. On the other hand, when the reception unit 141 of the measurement device 140 receives the excitation signal transmitted at time 0, the transmission unit 144 requires time t to transmit the measurement information. Measurement information can be received. Further, when the reception unit 141 receives the excitation signal transmitted at time s, the transmission unit 144 requires time t to transmit the measurement information. Therefore, the monitoring information collection terminal 110 receives the measurement information at time s + t. can do.

At this time, if the time s is different from the time t in the monitoring information collection terminal 110, the monitoring information collection terminal 110 is transmitting the excitation signal when the transmission unit 144 is transmitting the measurement information, that is, the monitoring information. Since the directivity of the collection terminal antenna 111 does not face the direction of the transmission antenna 146, there is a possibility that the monitoring information collection terminal 110 cannot receive the measurement information.
For example, when the transmission / reception switching time t is 5 seconds and the time s is 2 seconds, the monitoring information collection terminal 110 transmits the excitation signal between the time 0 seconds and 2 seconds, and the time is 2 seconds to 4 seconds. Transmission and reception are switched every 2 seconds, such as waiting for reception until 2 seconds, and transmitting an excitation signal when the time is between 4 seconds and 6 seconds. When the reception unit 141 of the measurement device 140 receives the excitation signal transmitted at time 0, the transmission unit 144 takes 5 seconds to transmit the measurement information. Measurement information can be received. However, since the monitoring information collection terminal 110 transmits the excitation signal between 4 seconds and 6 seconds, the directivity of the monitoring information collection terminal antenna 111 does not face the direction of the transmission antenna 146 at the time of 5 seconds. . As a result, the monitoring information collecting terminal antenna 111 cannot receive the measurement information.

  On the other hand, if the time s is equal to the time t in the monitoring information collection terminal 110, the measurement information corresponding to the excitation signal transmitted by the monitoring information collection terminal 110 at time 0 can be received at time t. Since the time s is equal to the time t, the monitoring information collection terminal 110 starts waiting for reception at time t. Thereby, measurement information can be received. Moreover, the measurement information corresponding to the excitation signal transmitted by the monitoring information collection terminal 110 at time s can be received at time s + t. That is, the measurement information corresponding to the excitation signal transmitted by the monitoring information collection terminal 110 at time t can be received at time 2t. Since the monitoring information collection terminal 110 finishes waiting for reception at time 2t, it can receive measurement information.

  For this reason, since measurement information corresponding to the excitation signal transmitted from time 0 to time t can be received from time t to time 2t, reception of measurement information is reduced and reception reliability is increased. Can do. Therefore, even if the transmission / reception switching time t is set to L / nv, the same effect can be obtained. However, n is an integer of 1 or more.

  However, since the monitoring information collection terminal 110 cannot switch transmission and reception instantaneously, it cannot receive the measurement information transmitted just at the time t or at the time 2t. Therefore, the monitoring information collecting terminal 110 is configured so that the transmission unit 144 of the measuring device 140 has a width Δt before and after the time for transmitting a signal, and the intermediate time is set as the transmission / reception switching time t at the terminal. Measurement information transmitted at time t ± Δt or at time 2t ± Δt can be received. For example, the monitoring information collection terminal 110 can receive measurement information corresponding to the excitation signal transmitted at time 0 at time t + Δt. In addition, measurement information corresponding to the excitation signal transmitted at time t can be received at time 2t−Δt.

Next, the operation of the measuring device 140 shown in FIG. 1 will be described.
In the present embodiment, the sensor 142 measures the state of the maintenance monitoring target 130 in a predetermined cycle and stores measurement information indicating the state of the maintenance monitoring target 130 measured in the measurement information storage unit 143 in advance. .
FIG. 5 is a flowchart showing the operation of the measuring device 140.
The receiving unit 141 of the measuring device 140 receives the excitation signal from the receiving antenna 145 (step S11). When the receiving unit 141 receives the excitation signal, the sensor 142 measures the state of the maintenance monitoring object 130 (step S12). Next, the transmission unit 144 acquires the measurement information stored in the measurement information storage unit 143 and the measurement information indicating the state of the maintenance monitoring target 130 measured by the sensor 142 (step S13). Here, the transmission unit 144 acquires the measurement state stored in the measurement information storage unit 143 by transmitting a record of the measurement state in a period from the time when the previous measurement information is transmitted to the time when the current measurement information is transmitted. It is to do. Thereby, since the monitoring information collection terminal 110 can acquire all the measurement states up to the time when the measurement information is transmitted this time, the monitoring information collection terminal 110 can know in detail the time when the state of the maintenance monitoring object 130 has changed. When the measurement information is acquired, the transmission unit 144 converts the acquired measurement information into a radio signal (step S14). When the measurement information is converted into a radio signal, the transmission unit 144 transmits the measurement information converted into the radio signal from the transmission antenna 146 (step S15). When completing the transmission, the transmission unit 144 deletes the measurement information stored in the measurement information storage unit 143 (step S16).

According to the monitoring information collection terminal and the measurement device described above, when the monitoring information collection terminal transmits the excitation signal, the monitoring information collection terminal is directed by directing the directivity of the monitoring information collection terminal antenna toward the reception antenna of the measurement device. High-quality wireless communication can be performed even if the distance between the terminal and the measuring device is long. As a result, the excitation signal can be received by the measurement device earlier than the conventional method. Also, when the monitoring information collection terminal receives the measurement information, the monitoring information collection terminal can receive the measurement information earlier than the conventional method by directing the antenna directivity toward the transmission antenna of the measurement device. Is possible.
Further, according to the present invention, transmission / reception is performed based on the time obtained by dividing the distance from the position where the monitoring information collecting terminal has transmitted the excitation signal to the position where the measurement information can be received by the speed of the moving object. By switching, the monitoring information collection terminal is always in a reception standby state when the measurement device transmits measurement information. Thereby, it is possible to improve the certainty of reception of measurement information.

As described above, the embodiment of the present invention has been described in detail with reference to the drawings. However, the specific configuration is not limited to the above, and various design changes and the like can be made without departing from the scope of the present invention. It is possible to
For example, in the present embodiment, the case where the monitoring information collection terminal 110 continuously transmits the excitation signal has been described. However, the present invention is not limited to this, and the monitoring information collection terminal 110 exists in a range where communication with the receiving antenna 141 is possible. The person who gets on the moving body 120 gives a command to transmit the excitation signal to the monitoring information collecting terminal 110, so that the excitation signal can be transmitted to the receiving antenna 141.

  In the present embodiment, the measurement information of the maintenance monitoring target 130 measured by the sensor 142 at a predetermined cycle is stored in the measurement information storage unit 143, and when the reception unit 141 receives the excitation signal, the sensor 142 However, the present invention is not limited to this, and the sensor 142 is not provided with the measurement information storage unit 143 in the measurement device 140 and only receives the excitation signal. By measuring this state, it is possible to reduce power consumption.

In addition, although this embodiment demonstrated the case where the certainty of reception of measurement information was improved by calculating the transmission / reception switching time t of the monitoring information collection terminal 110 based on the moving speed v of the moving body 120, it is not limited to this. Alternatively, the certainty of receiving the measurement information can be improved by changing the direction of directivity of the monitoring information collecting terminal antenna 111 according to the moving speed v.
FIG. 6 is a diagram illustrating an example in which the direction of directivity of the monitoring information collection terminal antenna 111 is changed according to the moving speed v of the moving body 120. FIG. 6B shows a case where the moving speed v of the moving body 120 is high compared to FIG. 6A showing a case where the moving speed v of the moving body 120 is low when the transmission / reception switching time t is fixed. The distance over which the moving body 120 moves from when the monitoring information collecting terminal antenna 111 transmits the excitation signal to when the measurement information is received becomes longer. Therefore, in order to improve the certainty of reception of measurement information, the directivity of the monitoring information collection terminal antenna 111 at the time of excitation signal transmission and measurement signal reception may be changed according to the distance that the moving body 120 moves.

When the direction of directivity of the monitoring information collection terminal antenna 111 is changed according to the moving speed v of the moving body 120, the measurement information is received after transmitting the excitation signal to the parameter storage unit 118 of the monitoring information collection terminal 110 in advance. The mobile unit 120 receives the reception time T indicating the time until the mobile unit 120 can receive, the inter-antenna distance l representing the distance of the component parallel to the traveling direction of the mobile unit 120 between the reception antenna 145 and the transmission antenna 146. A reception antenna installation distance _dr and a transmission antenna installation distance d _s indicating the distance from the place closest to the antenna 145 and the transmission antenna 146 to the reception antenna 145 and the transmission antenna 146 are stored. The reception time T, the reception antenna installation distance _dr, and the transmission antenna installation distance d _s are parameters that are known by measuring in advance. The transmission / reception switching unit 116 sends the reception time T, the reception antenna installation distance _dr and the transmission antenna installation distance d _s stored in the parameter storage unit 118, and the moving speed v acquired by the speed acquisition unit 117 to the directivity control unit 115. input. The directivity control unit 115 calculates the movement distance L based on the movement speed v and the reception time T. The moving distance L can be obtained by calculating v × T. A moving distance L, the distance between antennas l, the angle of the directivity is calculated by the receiving antenna installation distance d _r and the transmission antenna installation distance d _s, directional by the receiving antenna installation direction a _r and the transmission antenna installation direction a _s Determine the orientation. The directivity angle can be obtained by the following equation, for example.

Here, r _r represents the directivity angle during excitation signal transmission, and r _s represents the directivity angle during reception standby.

In this embodiment, the case where the monitoring information collection terminal antenna 111 is physically a single transmission / reception shared antenna has been described. However, the present invention is not limited to this, and the monitoring information collection terminal antenna 111 is composed of a transmission antenna and a reception antenna. It may be configured.
FIG. 7 is a schematic block diagram illustrating a configuration of the monitoring information collection terminal when the monitoring information collection terminal antenna includes a reception antenna and a transmission antenna. The monitoring information collection terminal antenna 111 includes a monitoring information collection terminal transmission antenna 112, a monitoring information collection terminal reception antenna 113, and a switch 1114. The monitoring information collection terminal transmission antenna 112 is an adaptive array antenna including transmission array antenna elements 1121-1 to 1121-B, transmission weighting circuits 1122-1 to 1122-B, and a distribution circuit 1123. The monitoring information collection terminal receiving antenna 113 is an adaptive array antenna including receiving array antenna elements 1131-1 to 1131-C, reception weighting circuits 1132-1 to 1132-C, and a combining circuit 1133.

When the monitoring information collection terminal 110 transmits a signal, the switch 1114 outputs the signal output from the monitoring information collection terminal 110 to the distribution circuit 1123. When the switch 1114 outputs a signal to the distribution circuit, the distribution circuit 1123 distributes the signal output from the switch 1114 into B pieces. When the distribution circuit 1123 distributes the signal, the transmission weighting circuits 1122-1 to 1122-B respectively set the weighting factors w1 to w1 for setting the directivity direction of the monitoring information collecting terminal transmission antenna 112 to the signals distributed by the distribution circuit 1123. Multiply wB. When the transmission weighting circuits 1122-1 to 1122-B weight the signals, the transmission array antenna elements 1121-1 to 1121-B transmit the signals weighted by the transmission weighting circuits 1122-1 to 1122-B, respectively.
When the monitoring information collection terminal 110 receives a signal, when the reception array antenna elements 1131-1 to 1131-C receive the signal, the reception weighting circuits 1132-1 to 1132-C respectively receive the reception array antenna elements 1131-1 to 1131-1. Weighting coefficients x1 to xC for setting the direction of directivity of the monitoring information collection terminal receiving antenna 113 are applied to the signal received by 1131-C. When the reception weighting circuits 1132-1 to 1132-C weight the signals, the combining circuit 1133 combines the signals weighted by the reception weighting circuits 1132-1 to 1132-C.
The directivity control unit 115 controls the weighting factors w1 to wB and x1 to xC, so that the monitoring information collection terminal transmission antenna 112 and the monitoring information collection terminal reception antenna 113 can have different directivities.

  In this embodiment, the case where the monitoring information collection terminal antenna 111 is an adaptive array antenna and the directivity control unit 115 controls the directivity direction of the monitoring information collection terminal antenna 111 has been described. However, the present invention is not limited to this. The monitoring information collection terminal antenna 111 is an antenna that forms directivity by the physical shape of the antenna, such as a sector antenna or a horn antenna, and the directivity control unit 115 directly controls the elevation angle and azimuth angle of the monitoring information collection terminal antenna 111. Thus, the same effect can be obtained.

  In the present embodiment, the case where the reception antenna 145 and the transmission antenna 146 of the measurement device 140 are configured to be physically independent has been described. However, the present invention is not limited to this. A similar effect can be obtained by substituting a switch for switching the connection to the receiver.

In the present embodiment, the case where the reception antenna 145 and the transmission antenna 146 have no directivity has been described. However, the present invention is not limited to this, and the monitoring information collection terminal can be obtained when the reception antenna 145 and the transmission antenna 146 have directivity. High-quality wireless communication can be performed even if the distance between the measurement device 110 and the measurement device 140 is long.
FIG. 8 is a schematic block diagram showing a configuration of the equipment maintenance / inspection system 1 when the reception antenna 145 and the transmission antenna 146 have directivity. The equipment maintenance / inspection system 1 has the same configuration as the equipment maintenance / inspection system 1 in FIG.
The receiving antenna 145 is an antenna having directivity, and the directivity of the receiving antenna 145 is directed in the direction in which the moving body 120 arrives as shown in FIG. Can be received. Further, the transmission antenna 146 is an antenna having directivity, and the directivity of the transmission antenna 146 is directed in the direction in which the moving body 120 passes as shown in FIG. Even when the collection terminal 110 and the measurement device 140 are separated from each other, wireless communication with less influence of interference can be performed, and therefore, the measurement information can be transmitted to the monitoring information collection terminal 110 with higher quality.

It is a schematic block diagram which shows the structure of the equipment maintenance inspection system by one Embodiment of this invention. It is a schematic block diagram which shows the structure of a monitoring information collection terminal. It is a schematic block diagram which shows the structure of the monitoring information collection terminal antenna. It is a flowchart which shows operation | movement of the monitoring information collection terminal. It is a flowchart which shows operation | movement of a measuring device. It is a figure showing the example which changes the direction of the directivity of the monitoring information collection terminal antenna with the moving speed of a moving body. It is a schematic block diagram which shows the structure of the monitoring information collection terminal in case a monitoring information collection terminal antenna is comprised with a receiving antenna and a transmission antenna. It is a schematic block diagram which shows the structure of the equipment maintenance inspection system in case a receiving antenna and a transmitting antenna have directivity. It is a schematic block diagram which shows the structure of the conventional equipment maintenance inspection system.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Equipment maintenance inspection system 110 ... Monitoring information collection terminal 111 ... Monitoring information collection terminal antenna 112 ... Excitation signal transmission part 113 ... Measurement information reception part 114 ... Monitoring information storage part 115 ... Directivity control part 116 ... Transmission / reception switching part 117 ... Speed acquisition unit 118 ... parameter storage unit 120 ... moving object 130 ... maintenance monitoring object 140 ... measurement device 141 ... reception unit 142 ... sensor 143 ... measurement information storage unit 144 ... transmission unit 145 ... reception antenna 146 ... transmission antenna

Claims (3)

Send measurement information indicating the status of the maintenance monitoring object,
A sensor for measuring the state of the maintenance monitoring object;
A receiving unit that receives an excitation signal that is a transmission request for the measurement information from a receiving antenna;
A transmission unit that converts the measurement information indicating the state of the maintenance monitoring object measured by the sensor into a wireless signal and transmits it from a transmission antenna;
A monitoring information collection terminal that communicates with a measuring device comprising:
The monitoring information collection terminal is provided in a mobile object,
The time from when the excitation signal is transmitted in advance to when the measurement device receives the excitation signal and the measurement device transmits measurement information to receive the measurement information from the measurement device. The reception time indicated, the inter-antenna distance representing the distance of the component parallel to the traveling direction of the moving body between the receiving antenna and the transmitting antenna, and the monitoring at the place where the moving body is closest to the receiving antenna A reception antenna installation distance indicating a distance from the information collection terminal antenna to the reception antenna, and a transmission indicating a distance from the monitoring information collection terminal antenna to the transmission antenna in a place where the mobile body is closest to the transmission antenna an antenna installation distance, there is the reception antenna when viewed from the moving object when the moving object passes through the receiving antenna A parameter storage unit for storing the receiving antenna installation direction indicating a direction, the transmitting antenna installation direction in which the moving object showing the direction in which the transmitting antenna is present as seen from the moving object when passing through the transmitting antenna that,
A monitoring information collection terminal antenna having directivity;
An excitation signal transmitter for transmitting the excitation signal from the monitoring information collection terminal antenna;
A measurement information receiving unit for receiving the measurement information from the monitoring information collecting terminal antenna;
A directivity control unit that controls the directivity direction of the monitoring information collection terminal antenna for each reception time;
A transmission / reception switching unit that switches transmission / reception from the monitoring information collection terminal antenna;
A speed acquisition unit for acquiring a moving speed of the moving body;
Have
The directivity control unit, when the transmission / reception switching unit switches the monitoring information collection terminal antenna to transmission, the directivity of the monitoring information collection terminal antenna faces the direction of the reception antenna, and the transmission / reception switching unit When the information collection terminal antenna is switched to reception, a movement distance obtained by multiplying the reception time and the movement speed so that the directivity of the monitoring information collection terminal antenna faces the direction of the transmission antenna, and the distance between the antennas And controlling the angle of directivity of the monitoring information collection terminal antenna based on the receiving antenna installation distance and the transmission antenna installation distance, and collecting the monitoring information based on the reception antenna installation direction and the transmission antenna installation direction. A monitoring information collection terminal characterized by controlling the directionality of the terminal antenna. The monitoring information collection terminal antenna is
An excitation signal transmitting antenna for transmitting the excitation signal;
A measurement information receiving antenna for receiving the measurement information, and
The monitoring information collection terminal according to claim 1 , wherein the excitation signal transmitting antenna and the measurement information receiving antenna have different directivities. A facility maintenance inspection system comprising a measuring device that transmits measurement information indicating a state of a maintenance monitoring object, and a monitoring information collection terminal that receives the measurement information,
The monitoring information collection terminal is provided in a mobile object,
The time from when the excitation signal is transmitted in advance to when the measurement device receives the excitation signal and the measurement device transmits measurement information to receive the measurement information from the measurement device. The reception time indicated, the inter-antenna distance representing the distance of the component parallel to the traveling direction of the moving body between the receiving antenna and the transmitting antenna, and the monitoring at the place where the moving body is closest to the receiving antenna A reception antenna installation distance indicating a distance from the information collection terminal antenna to the reception antenna, and a transmission indicating a distance from the monitoring information collection terminal antenna to the transmission antenna in a place where the mobile body is closest to the transmission antenna Antenna installation distance and when the mobile body passes through the reception antenna, the reception antenna is present when viewed from the mobile body A parameter storage unit for storing the receiving antenna installation direction indicating a direction, the transmitting antenna installation direction in which the moving object showing the direction in which the transmitting antenna is present as seen from the moving object when passing through the transmitting antenna that,
The monitoring information collection terminal has a directivity monitoring information collection terminal antenna;
An excitation signal transmitter that transmits an excitation signal that is a transmission request for the measurement information from the monitoring information collection terminal antenna;
A measurement information receiving unit for receiving the measurement information from the monitoring information collecting terminal antenna;
A directivity control unit that controls the direction of directivity of the monitoring information collection terminal antenna;
A transmission / reception switching unit that switches transmission / reception from the monitoring information collection terminal antenna for each reception time ;
A speed acquisition unit for acquiring a moving speed of the moving body;
Have
The directivity control unit is configured such that when the transmission / reception switching unit switches the monitoring information collection terminal antenna to transmission, the directivity of the monitoring information collection terminal antenna faces the direction of the reception antenna of the measurement device, and the transmission / reception switching unit Is obtained by multiplying the reception time and the moving speed so that the directivity of the monitoring information collection terminal antenna faces the direction of the transmission antenna of the measuring device when the monitoring information collection terminal antenna is switched to reception. Based on the distance, the distance between the antennas, the receiving antenna installation distance and the transmission antenna installation distance, the angle of directivity of the monitoring information collection terminal antenna is controlled, and the receiving antenna installation direction and the transmission antenna installation direction are controlled. Based on the directionality of the monitoring information collection terminal antenna based on ,
The measuring device includes a sensor for measuring the state of the maintenance monitoring object,
A receiver for receiving the excitation signal from a receiving antenna;
A transmission unit that converts the measurement information indicating the state of the maintenance monitoring object measured by the sensor into a wireless signal and transmits it from a transmission antenna;
A facility maintenance inspection system characterized by comprising:

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