JP2014085799A - Wireless sensor terminal, wireless monitoring device and wireless monitoring system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To solve the problem of a conventional monitoring system, in which a drastic change of an existing facility is required and it is difficult to monitor an operation state of the facility.SOLUTION: The wireless monitoring system comprises: at least one wireless sensor terminal which is attached to an object and includes power generation means for converting physical energy generated at the time of activation of the object into electric energy, and terminal side transmission means which operates by the electric energy output by the power generation means to transmit predetermined data; and a wireless monitoring device which includes monitoring side reception means for receiving the predetermined data transmitted from the terminal side transmission means, and monitoring means for monitoring a cycle in which the monitoring side reception means receives the predetermined data to discriminate an operation state of the object.

Description

  The present invention relates to a wireless sensor terminal, a wireless monitoring device, and a wireless monitoring system.

  There is a need for a system that monitors whether existing facilities that do not have a monitoring function or communication function are operating normally. For example, there is a system that monitors whether or not a defrost fan is rotating in a field where a blower fan (hereinafter referred to as a defrost fan) for preventing frost from adhering to a crop is installed. (For example, refer nonpatent literature 1).

http: // www. kagoshima-it. go. jp / public / happyo / happy2007 / 2007-28. pdf

  In the prior art, for example, a camera having a communication function is installed in a farm field, the frost-proof fan is periodically photographed by the camera, and the photographed still image is transmitted from the camera to the monitoring device. Then, the operator on the monitoring device visually checks the still image on the monitor screen and determines whether or not the anti-frost fan is rotating. For this reason, for example, even when the frost-proof fan in a failure state is rotating with wind, the operator determines that the frost-proof fan is operating normally. Furthermore, it is not easy for an operator to monitor the state of a large number of defrosting fans arranged in a plurality of fields, which is labor intensive and humans make judgments, so there is a risk of misrecognition.

  In view of the above problems, an object of the present invention is to provide a wireless sensor terminal, a wireless monitoring device, and a wireless monitoring system that can monitor the operating state of the facility without greatly changing the existing facility.

  According to one aspect, a wireless monitoring system includes a power generation unit that converts physical energy generated during operation of an object into electrical energy, and a terminal-side transmission that operates by electrical energy output from the power generation unit and transmits predetermined data. At least one wireless sensor terminal attached to the object, a monitoring-side receiving means for receiving the predetermined data transmitted from the terminal-side transmitting means, and the monitoring-side receiving means And a wireless monitoring device having monitoring means for monitoring the period of receiving the data and determining the operating state of the object.

  A wireless sensor terminal according to one aspect includes a power generation unit that converts physical energy generated during operation of an object into electrical energy, and a terminal-side transmission that operates by electrical energy output from the power generation unit and transmits predetermined data. Means.

  According to an aspect of the present invention, a wireless monitoring device includes a monitoring-side receiving unit that receives predetermined data transmitted from a wireless sensor terminal that transmits data during operation of an object, and the monitoring-side receiving unit receives the predetermined data. Monitoring means for monitoring the period of the operation and determining the operating state of the object.

  The wireless sensor terminal, the wireless monitoring device, and the wireless monitoring system of the present disclosure can monitor the operating state of the equipment without greatly changing the existing equipment.

1 is a diagram illustrating an example of a wireless monitoring system 100. FIG. It is a figure which shows an example of a log. It is a figure which shows an example of the monitoring system 900 by a camera. It is a figure which shows the example of installation of the wireless sensor terminal 101. FIG. It is a figure which shows an example of the wireless sensor terminal 101 and the wireless monitoring apparatus. 6 is a diagram illustrating another example of the wireless sensor terminal 101. FIG. FIG. 3 is a diagram illustrating a relay example of the wireless sensor terminal 101. 6 is a diagram illustrating another relay example of the wireless sensor terminal 101. FIG. It is a figure which shows an example of the transmission pattern of the wireless sensor terminal. 5 is a flowchart illustrating an operation example of the wireless sensor terminal 101. 6 is a flowchart illustrating an example of a determination process of the wireless monitoring device. 5 is a flowchart illustrating an example of a relay operation of the wireless sensor terminal 101. 10 is a flowchart illustrating another example of the relay operation of the wireless sensor terminal 101.

  Hereinafter, embodiments of the wireless sensor terminal, the wireless monitoring device, and the wireless monitoring system of the present disclosure will be described in detail.

  In this embodiment, as a wireless monitoring system, a system for remotely monitoring whether or not existing equipment related to the growth of agricultural products in a farm field (tea plantation, orchard, etc.) is operating normally will be described. For example, in a tea plantation, anti-frost fans are installed at regular intervals to blow air over the entire plant to prevent frost from adhering to the leaves. When the frost-proof fan breaks down, damage due to frost occurs. Therefore, it is required to always monitor whether or not the frost-proof fan is rotating normally. However, the frost-proof fan itself is a facility that has been used for a long time, and it does not have a remote monitoring function, and farmers regularly visit the site to check the operation of the frost-proof fan. Expensive systems such as remodeling and replacement of frost-proof fans were introduced.

  Therefore, the wireless monitoring system according to the present embodiment monitors the operating state of the equipment without greatly changing existing equipment and without performing extensive wiring work. FIG. 1 is a diagram illustrating an example of a wireless monitoring system 100 according to the present embodiment. In FIG. 1, a wireless monitoring system 100 is a system based on a plurality of wireless sensor terminals 101 and a wireless monitoring device 102. A host center 103, a monitoring terminal 104, and the like are installed for monitoring at a remote location. The host center 103 generally manages information on each field when there are a plurality of fields, but the wireless monitoring device 102 and the monitoring terminal 104 may be directly connected via the network 150. Further, the network 150 may be wired when a wired network is already laid, but since a wired network is not laid in a general field, it is preferable to use a wireless network such as a mobile phone network or a wireless LAN. .

  In the example of FIG. 1, five frost preventions, that is, the frost-proof fan 200 (1), the frost-proof fan 200 (2), the frost-proof fan 200 (3), the frost-proof fan 200 (4), and the frost-proof fan 200 (5). A fan 200 is installed in the farm field 151. The anti-frost fan 200 is installed with a distance of about 50 m, for example.

  Here, in the following description, the defrost fan 200 (1), the defrost fan 200 (2), the defrost fan 200 (3), the defrost fan 200 (4), and the defrost fan 200 (5) are common. In the case of explaining the contents, (number) is omitted and expressed as a defrosting fan 200. Moreover, when referring to the specific frost-proof fan 200, (number) is added to a code | symbol, for example, it describes like frost-proof fan 200 (3).

  In FIG. 1, each frost-proof fan 200 is provided with a wireless sensor terminal 101. Here, also regarding the wireless sensor terminal 101, when referring to the wireless sensor terminal 101 installed in a specific frost-proof fan 200, (number) is added to the reference numeral, for example, installed in the frost-proof fan 200 (2). The wireless sensor terminal 101 (2) is represented.

  The wireless sensor terminal 101 has a power generation function that converts physical energy when the anti-frost fan 200 is operated into electrical energy, and periodically transmits predetermined data wirelessly using the generated power. An example of the power generation function will be described with reference to FIG. Here, the predetermined data may be information on the presence or absence (on / off) of radio waves transmitted at a specific frequency, or may be set in advance using amplitude modulation, frequency modulation, phase modulation, or spread spectrum modulation. The transmitted information may be transmitted. For example, the preset information includes a defrost fan number, a unique serial number of the wireless sensor terminal 101, and the like.

  The wireless monitoring device 102 analyzes the data received from the wireless sensor terminal 101, determines the operating state of the defrost fan 200, and transmits the determination result to the host center 103 via the network 150. At this time, the wireless monitoring apparatus 102 may add information for identifying the farm field to the determination result. The information for identifying the field is, for example, a number or name assigned in advance to each field. Alternatively, when the field in which the wireless monitoring device 102 is arranged is known in advance, the serial number of the wireless monitoring device 102 may be added to the determination result. As a result, the wireless monitoring apparatus 102 recognizes the farm field being monitored. A method of analyzing the data received by the wireless monitoring device 102 from the wireless sensor terminal 101 and determining the operating state of the anti-frost fan 200 will be described in detail later.

  The host center 103 accumulates the log of the determination result received from the wireless monitoring device 102 by field.

  Note that the operating state of the anti-frost fan 200 may be determined by the host center 103 or the monitoring terminal 104 instead of the wireless monitoring device 102. In any case, the wireless monitoring device 102, the host center 103, and the monitoring terminal 104 can monitor the operating state of the frost-proof fan 200 in each field by using predetermined data transmitted from the wireless sensor terminal 101.

Here, an example of the log accumulated in the host center 103 is shown below. The following is an example, and other information may be recorded.
-Log recording date and time: October 1, 2012, 4:15:30 am-Field name: Field A (name corresponding to field 151)
・ Operating state of defrosting fan: ○
When a plurality of defrost fans 200 are installed in the field, the host center 103 records “O” (operation) in the log if all the defrost fans 200 are normal. If any one of the plurality of defrost fans 200 fails, the host center 103 records x (inactive) in the log. The wireless monitoring device 102 determines the operating state of the anti-frost fan 200 based on the reception result of the predetermined data transmitted from the wireless sensor terminal 101 and transmits it to the host center 103.

  Then, the operator 161 operates the monitoring terminal 104 to access the host center 103 via the network 150 and confirms the operating state of the frost-proof fan 200 in each field. For example, information as shown in FIG. 2 is displayed on the screen of the monitoring terminal 104. In the example of FIG. 2, since the operation state of the A field is ○ (operation), it can be seen that all the defrost fans 200 are operating normally. On the other hand, since the operation state of the B field is x (non-operation), it can be seen that one of the defrost fans 200 installed in the B field has failed. In the example of FIG. 2, the date and time when the log is recorded in the host center 103 is displayed, but only the operating state may be displayed.

  In this way, the wireless monitoring system 100 according to the present embodiment monitors the operating state of the frost-proof fan 200 in which the wireless sensor terminal 101 is installed.

  Here, FIG. 3 shows an example of another monitoring system 900 so that the features of the present embodiment can be easily understood. For example, the monitoring system 900 captures an image 910 of the defrost fan 901 installed in the farm 951 with the camera 952 and stores it in the host center 903 or transmits it to the monitoring terminal 904. Then, the operator 961 operates the monitoring terminal 904 to display an image 910 received from the host center 903 or the monitoring device 902 on the screen, and confirms the operation of the defrosting fan. At this time, the operator 961 looks at the fan of the defrosting fan 901 in the image 910 and determines that it is in operation if it appears to be rotating and is inoperative if it appears to have stopped. Thus, since the operator 961 confirms the operation state of the defrost fan 901 with the image 910, there is a problem such as erroneous recognition.

  In contrast, the wireless monitoring system 100 according to the present embodiment can automatically determine the operating state of the frost-proof fan 200 only by installing the wireless sensor terminal 101 on the existing frost-proof fan 101. For example, since the wireless sensor terminal 101 operates by the generated power and communicates wirelessly, wiring such as a power supply or a communication line is unnecessary, and it is only necessary to install the wireless sensor terminal 101 so that the vibration of the anti-frost fan 200 is transmitted. Thereby, since the wireless sensor terminal 101 can be attached to the anti-frost fan 200 by an adhesive or screwing, a large-scale construction is unnecessary. Further, since the wireless sensor terminal 101 has a power generation function, maintenance such as battery replacement is unnecessary.

[Wireless sensor terminal 101]
Next, the wireless sensor terminal 101 will be described. FIG. 4A is a diagram illustrating an example of an existing anti-frost fan 200 to which the wireless sensor terminal 101 is not attached. 4A, a defrosting fan 200 has a motor 201, a rotating shaft 202 of the motor 201, and a fan 203 attached to the rotating shaft 202. The motor 201 is built on the ground of a tea plantation or the like. Attached to the support post 204.

  For example, the wireless sensor terminal 101 is installed on the motor 201 of the anti-frost fan 200 as shown in FIG. The wireless sensor terminal 101 has a power generation function that converts physical vibration when the motor 201 is driven into electrical energy, and operates with the generated power. As a power generation method for converting vibration energy into electrical energy, there are a method using a piezoelectric element, a method of reciprocating a magnet in a coil, and the like. In this case, electric power is generated by a change in magnetic force. Further, even when the frost-proof fan 200 is out of order, it may vibrate due to rotation by wind. However, since the rotation is not stable, depending on whether or not the generated power is stable within a predetermined range, It is possible to distinguish whether or not the power is generated by wind. Thereby, the misrecognition by a wind can be prevented.

  FIG. 4C shows another example of installation of the wireless sensor terminal 101, and the wireless sensor terminal 101 is installed on the rotating shaft 202 of the motor 201 of the defrost fan 200. In FIG.4 (c), the wireless sensor terminal 101a has the electric power generation function which rotates the small generator of the motor 201, and converts it into electrical energy, and operate | moves with the generated electric power. In this case, the wireless sensor terminal 101a converts, for example, vibration or centrifugal force due to rotation of the motor 201 into electrical energy. In this case, electric power is generated using the pressure of the generator or centrifugal force. Alternatively, the structure of the wireless sensor terminal 101a does not rotate with respect to the motor 201 (for example, a structure in which a weight is placed in a part of the housing of the wireless sensor terminal 101a to stabilize in the direction of gravity), and the generator shaft Electricity is generated by coupling and rotating with the rotating shaft 202 of the motor 201.

  Here, the power generation method described above is an example, and power may be generated by other methods such as using the air blown by the defrost fan 200 as in a wind power generator. However, when using the ventilation of the anti-frost fan 200, the process for distinguishing from natural wind is performed. For example, as described in FIG. 4B, since the wind when the anti-frost fan 200 is operating is stable, whether or not the generated power is stable within a predetermined range. Thus, it is possible to distinguish whether the power generation is due to natural wind.

  FIG. 5 is a diagram illustrating an example of the wireless sensor terminal 101 and the wireless monitoring device 102. The wireless sensor terminal 101 and the wireless monitoring device 102 perform wireless communication based on, for example, a weak wireless standard or a specific low power wireless standard, but wireless communication based on other standards may be used. Good.

  In FIG. 5, the wireless sensor terminal 101 includes a power generation unit 301 and a wireless communication unit 302. Note that the wireless sensor terminals 101 (1) to 101 (n) have similar functions.

  As described above, the power generation unit 301 converts physical energy such as vibration energy and rotational energy of the motor 201 of the anti-frost fan 200 into electrical energy and supplies power to the wireless communication unit 302. Here, the power generation unit 301 is an example of power generation means.

  The wireless communication unit 302 is activated by the power supplied from the power generation unit 301, and transmits a signal having a predetermined frequency from the antenna 302b. Here, the transmission signal may be, for example, a non-modulated transmission of a carrier signal having a predetermined frequency, or may be modulated with identification data 302a (such as the number of the anti-frost fan 200 or the serial number of the wireless sensor terminal 101). Also good. Further, as will be described with reference to FIG. 6, a control unit 303 having a clock function and a timer function is provided, and the wireless communication unit 302 is identified by a preset time interval after being activated by the power supplied from the power generation unit 301. The data 302a may be transmitted.

  Here, as will be described later, the wireless communication unit 302 has a function of receiving a signal transmitted from another wireless sensor terminal 101 when operating as a relay device. Then, the wireless communication unit 302 retransmits the received signal from the antenna 302b. The signal to be transmitted / received may be only an unmodulated carrier signal or a signal modulated by the identification data 302a. In addition, when using identification data 302a that can identify the wireless sensor terminal 101, retransmission may be performed only when the identification data 302a transmitted from a specific wireless sensor terminal 101 is received. Thereby, when the identification data 302a transmitted by the same wireless sensor terminal 101 is received by the plurality of wireless sensor terminals 101, it is possible to prevent the plurality of wireless sensor terminals 101 from retransmitting redundantly. Here, the wireless communication unit 302 is an example of a terminal-side transmission unit and a terminal-side reception unit.

  On the other hand, in FIG. 5, the wireless monitoring apparatus 102 includes a wireless communication unit 401, a monitoring control unit 402, and a LAN (Local Area Network) communication unit 403. Information such as a serial number, a field number, and a field name of the wireless monitoring device 102 may be set in advance as the identification data 402a. In addition, the wireless monitoring apparatus 102 is operated by a commercial power supply, for example, although the power supply portion is omitted.

  The wireless communication unit 401 receives a radio wave transmitted from the wireless sensor terminal 101 via the antenna 401a and notifies the monitoring control unit 402 of it. When the received radio wave is a modulated signal, for example, the modulated identification data 302 a is demodulated and output to the monitoring control unit 402. Here, the wireless communication unit 401 is an example of a monitoring-side receiving unit.

  The monitoring control unit 402 has a clock function or a timer function, acquires the date and time (only the time is acceptable) and the number of times that the wireless communication unit 401 has received a signal from the wireless sensor terminal 101, and the anti-frost fan 200 operates normally. It is determined whether or not. The monitoring control unit 402 is an example of a monitoring unit. A specific determination method will be described in detail later. The monitoring control unit 402 transmits the determination result from the LAN communication unit 403 to the host center 103 or the monitoring terminal 104 via the network 150. Here, the monitoring control unit 402 stores the identification data 402a (field number, field name, serial number of the wireless monitoring device 102, etc.) of the wireless monitoring device 102 in advance in a memory or the like, and adds it to the determination result. Good. Thus, when managing a plurality of fields, the operator 161 can recognize which field the frost-proof fan 200 is in. Furthermore, the monitoring control unit 402 may add the date and time when the operating state of the anti-frost fan 200 is determined to the determination result and transmit the result to the host center 103 or the monitoring terminal 104. Alternatively, the host center 103 may be provided with a clock function, and the date and time may be added to the determination result received by the host center 103 from the wireless monitoring device 102.

  In this way, the log as described in FIG. 2 is accumulated in the host center 103 in FIG. 1, and the operator 161 accesses the log from the monitoring terminal 104 and monitors the state of the defrost fan 200 in each field. can do.

  Next, communication between the wireless monitoring device 102 and the wireless sensor terminal 101 will be described. In FIG. 1, communication between the wireless monitoring device 102 and the wireless sensor terminal 101 is not particularly described, and the description has been given assuming that predetermined data is received from each wireless sensor terminal 101. Actually, the defrost fans 200 are installed at intervals of about 50 m. For this reason, when only one wireless monitoring device 102 is installed in a wide field, the wireless monitoring device 102 and all the wireless sensor terminals 101 are directly connected to each other in a wireless system compliant with the weak wireless standard or the specific low power wireless standard. It may be difficult to communicate with. For example, FIG. 7A is a diagram illustrating an example of a communication range of the wireless sensor terminal 101 arranged at a position where the distance from the wireless monitoring device 102 is different. In the case of FIG. 7A, the communication range 181 (1) of the wireless sensor terminal 101 (1) located close to the wireless monitoring device 102 can directly communicate with the wireless monitoring device 102. However, the communication range 181 (5) of the wireless sensor terminal 101 (5) located far from the wireless monitoring device 102 is limited to the wireless sensor terminal 101 (4) and cannot communicate directly with the wireless monitoring device 102. .

  Therefore, in the wireless monitoring system 100 according to the present embodiment, as shown in FIG. 7B, the wireless sensor terminal 101 that cannot directly communicate with the wireless monitoring device 102 is another wireless sensor terminal 101 that can communicate. To communicate with the wireless monitoring apparatus 102. In the example of FIG. 7B, the wireless sensor terminal 101 (5) is set as the wireless sensor terminal 101 at the transmission end, and the other wireless sensor terminals 101 (1) to (4) are set as the wireless sensor terminals 101 for relay. Is set. And the signal which wireless sensor terminal 101 (5) transmits is received by wireless sensor terminal 101 (4), and the received signal is retransmitted. The signal retransmitted by the wireless sensor terminal 101 (4) is received by the wireless sensor terminal 101 (3), and the received signal is retransmitted. Similarly, the signal retransmitted by the wireless sensor terminal 101 (3) is received and retransmitted by the wireless sensor terminal 101 (2), and the signal retransmitted by the wireless sensor terminal 101 (2) is transmitted by the wireless sensor terminal 101 (2). (1) is received and retransmitted.

  Here, the signal retransmitted by the wireless sensor terminal 101 (4) is also received by the wireless sensor terminal 101 (5). However, since the wireless sensor terminal 101 (5) is set as a transmission end, the retransmission is not performed. Not performed. The signal retransmitted by the wireless sensor terminal 101 (3) is also received by the wireless sensor terminal 101 (4). However, since the wireless sensor terminal 101 (4) has just been retransmitted, no retransmission is performed. That is, since the wireless sensor terminal 101 (4) knows in advance that the interval of the signal to be received is the transmission interval of the wireless sensor terminal 101 (5), the wireless sensor terminal 101 (4) After transmission, control is performed so that a signal received during a period less than the transmission interval is not retransmitted. The wireless sensor terminal 101 (3) and the wireless sensor terminal 101 (2) operate similarly. In this way, it is possible to prevent the relaying wireless sensor terminal 101 from repeating the operation of retransmitting the signal indefinitely.

  In the case of FIG. 7A, when the signal transmitted from the wireless sensor terminal 101 (5) is received by both the wireless sensor terminal 101 (4) and the wireless sensor terminal 101 (3), the retransmission is repeated. Will be. Therefore, the wireless sensor terminal 101 performs carrier sense when retransmitting, and controls to wait when another wireless sensor terminal 101 transmits. Alternatively, the wireless sensor terminal 101 may randomly vary the time from when a signal is received until it is retransmitted so that it does not collide with the transmission of another wireless sensor terminal 101, or the wait time may be random. It may be variable. Alternatively, the designer can design the system so that the communication range of the wireless sensor terminal 101 for relay is always only the adjacent wireless sensor terminal 101, and adjust the transmission power when installing each wireless sensor terminal 101. It may be left.

  Alternatively, when each wireless sensor terminal 101 transmits its own identification data 302a, the identification data 302a to be retransmitted is determined in advance, and the wireless sensor terminal 101 determines whether or not to retransmit using the identification data 302a. May be. For example, if the identification data 302a of the wireless sensor terminal 101 (5) at the transmitting end is the identification data 302a (5), the wireless sensor terminal 101 (4) performs a relay operation when the identification data 302a (5) is received. . Then, when retransmitting, the identification data 302a (4) of the own device is transmitted instead of the identification data 302a (5). Similarly, when the wireless sensor terminal 101 (3) receives the identification data 302a (4), the wireless sensor terminal 101 (3) performs a relay operation and transmits the identification data 302a (3). Further, when the wireless sensor terminal 101 (2) receives the identification data 302a (3), the wireless sensor terminal 101 (2) performs a relay operation and transmits the identification data 302a (2). Further, when the wireless sensor terminal 101 (1) receives the identification data 302a (2), the wireless sensor terminal 101 (1) performs a relay operation and transmits the identification data 302a (1). In this way, the identification data 302a of the wireless sensor terminal 101 to be retransmitted is set in advance, and the wireless sensor terminal 101 replaces the identification data 302a received from another device for each relay with the identification data 302a of the own device and retransmits it. Send. Thereby, it is possible to prevent a plurality of wireless sensor terminals 101 from overlapping and retransmitting. When the wireless monitoring device 102 receives the identification data 302a (1), the wireless monitoring device 102 determines that all the defrost fans 200 are operating normally. This is because when one of the wireless sensor terminals 101 is not operating, the relay is interrupted and the wireless monitoring device 102 cannot receive the identification data 302a (1).

  Here, as an example, the wireless monitoring apparatus 102 can receive both the identification data 302a (1) transmitted by the wireless sensor terminal 101 (1) and the identification data 302a (2) transmitted by the wireless sensor terminal 101 (2). I will give a description. For example, when the wireless sensor terminal 101 (1) is out of order, the wireless monitoring device 102 can receive only the identification data 302a (2) of the wireless sensor terminal 101 (2). However, in the above example, since the wireless monitoring device 102 is waiting for reception of the identification data 302a (1) of the wireless sensor terminal 101 (1), the wireless monitoring device 102 receives the identification data 302a (1) within a preset time. If not, it is determined that the defrost fan 200 is not operating normally.

  FIG. 7B shows an example in which the anti-frost fans 200 are installed in almost one row, but there are cases in which they are not arranged in one row as shown in FIG. Even in this case, since each wireless sensor terminal 101 that performs relaying transmits the data by replacing it with its own identification data 302a, relaying can be performed without overlapping with other devices. Hereinafter, the relay operation in the case of FIG. 8 will be specifically described.

  In FIG. 8, for example, the wireless sensor terminal 101 at the transmission end is the wireless sensor terminal 101 (3), and the other wireless sensor terminals 101 are used for relaying. The wireless sensor terminal 101 (5) replaces the identification data 302a (5) with the identification data 302a (5) and transmits it only when the identification data 302a (3) of the wireless sensor terminal 101 (3) is received. Also, the wireless sensor terminal 101 (2) transmits the identification data 302a (2) instead of the identification data 302a (2) only when the identification data 302a (5) of the wireless sensor terminal 101 (5) is received. Similarly, only when the wireless sensor terminal 101 (4) receives the identification data 302a (2) of the wireless sensor terminal 101 (2), the wireless sensor terminal 101 (4) substitutes the identification data 302a (4) for transmission. Further, the wireless sensor terminal 101 (1) replaces the identification data 302a (1) with the identification data 302a (1) and transmits it only when the identification data 302a (4) of the wireless sensor terminal 101 (4) is received. Thus, by determining the identification data 302a to be retransmitted in advance, the wireless sensor terminal 101 can prevent redundant retransmission even when the identification data 302a is received from a plurality of wireless sensor terminals 101. . When the wireless monitoring device 102 receives the identification data 302a (1), the wireless monitoring device 102 determines that all the defrost fans 200 are operating normally. Here, if the wireless monitoring device 102 fails to receive the identification data 302a (1) of the wireless sensor terminal 101 (1) within a preset time, the frost-proof fan 200 is not operating normally. to decide. For example, when the wireless sensor terminal 101 to which the wireless monitoring device 102 cannot directly communicate is broken, the relay is interrupted, so the wireless monitoring device 102 cannot receive the identification data 302a (1), and the anti-frost fan 200 is normal. It is determined that it is not working. For example, in FIG. 8, when the relay wireless sensor terminal 101 (5) is out of order, the wireless sensor terminal 101 (2) cannot receive the identification data 302a (5) transmitted by the wireless sensor terminal 101 (5). Therefore, the relay is not performed after the wireless sensor terminal 101 (4).

  In this way, when a plurality of wireless sensor terminals 101 are installed, one wireless monitoring device 102 is installed even in a vast field by relaying the identification data 302a in order by the wireless sensor terminal 101. Just can cope.

  Next, a pattern example when the wireless sensor terminal 101 transmits the identification data 302a will be described. FIG. 9 is a diagram illustrating a pattern example in which the wireless sensor terminal 101 in which the fan 203 of the anti-frost fan 200 is rotated by the motor 201 transmits the identification data 302a. In FIG. 9, the wireless sensor terminal 101 is activated using power generated by steady vibration of the motor 201 as a power source, and transmits identification data 302a at a predetermined time interval. For example, in the case of FIG. 9, the wireless sensor terminal 101 transmits identification data 302a at intervals of 1 second (sec) in the order of identification data 302a (1), identification data 302a (2), and identification data 302a (3).

  Here, as described above, the wireless sensor terminal 101 may transmit an unmodulated carrier signal having a predetermined radio frequency, or may transmit a signal modulated by the identification data 302a. . Note that carrier sense may be performed before transmission to confirm that no other terminal or another system is using it.

  Next, the operation of the wireless sensor terminal 101 will be described in detail. FIG. 10 is a flowchart showing the operation of the wireless sensor terminal 101. In FIG. 10, a portion indicated by a dotted line indicates a situation before the wireless sensor terminal 101 is activated.

  (Step S101) When the power is turned on, the anti-frost fan 200 drives the motor 201 and the fan 203 rotates.

  (Step S102) When the fan 203 of the anti-frost fan 200 starts rotating, steady vibration occurs.

  (Step S <b> 103) The power generation unit 301 of the wireless sensor terminal 101 generates power by the vibration of the defrost fan 200.

  (Step S104) When the power generation unit 301 starts the microcomputer (microcomputer) of the wireless sensor terminal 101, the wireless sensor terminal 101 proceeds to the process of step S105. If the microcomputer is not activated, the wireless sensor terminal 101 returns to the process of step S101 and waits until the microcomputer is activated. Here, the microcomputer operates according to a program stored in advance in an internal memory, and is mounted on the wireless communication unit 302 in the example of FIG. 5 and mounted on the control unit 303 in the example of FIG.

  (Step S105) The wireless sensor terminal 101 counts a preset time (for example, 1 second (sec)) and waits for only 1 second. Specifically, the wireless sensor terminal 101 returns to the process of step S104 until one second elapses and waits, and when one second elapses, the wireless sensor terminal 101 proceeds to the process of step S106.

  (Step S106) The wireless sensor terminal 101 transmits identification data 302a from the wireless communication unit 302. Then, the process returns to the process of step S104 and waits again, and the identification data 302a is transmitted every time one second elapses in the determination process of step S105.

  In this way, the wireless sensor terminal 101 transmits the identification data 302a at a predetermined cycle using the electric power generated by the vibration of the motor 201 of the defrost fan 200.

  Next, the operation of the wireless monitoring apparatus 102 will be described in detail. FIG. 11 is a flowchart showing the operation of the wireless monitoring apparatus 102. Each process of FIG. 11 is a process mainly performed by the monitoring control unit 402.

  (Step S201) The monitoring controller 402 sets the timer to T seconds (for example, 60 seconds). Note that the timer may be equipped with timer hardware or software.

  (Step S <b> 202) The monitoring control unit 402 determines whether any one of a timer timeout and a signal reception from the wireless sensor terminal 101 has occurred. Then, the monitoring control unit 402 proceeds to the process of step S203 when the timer times out, and proceeds to the process of step S204 when the signal is received.

  (Step S <b> 203) The monitoring controller 402 determines that the defrosting fan 200 is not operating normally (non-operating) because the signal has not been received a predetermined number of times (R times) in T seconds. Then, status information indicating that the defrosting fan 200 is not operating is transmitted to the host center 103 or the monitoring terminal 104. Thereafter, the monitoring control unit 402 proceeds to the process of step S207.

  (Step S204) The monitoring control unit 402 increments a counter indicating the number of signal receptions by one.

  (Step S205) The supervisory control unit 402 determines whether or not the number of signal receptions is equal to or greater than the preset R times. The monitoring control unit 402 returns to the process of step S202 when the number of receptions is less than R, and proceeds to the process of step S206 when the number of receptions is R or more.

  For example, when the wireless sensor terminal 101 is set to transmit a signal at a cycle of 1 second and the timer T set in step S201 is 60 seconds, whether or not R is 60 times or more is determined. Determine. In consideration of the influence of the radio wave condition, noise, and the like, in the above example, it may be determined to be normal if the number of receptions for 60 seconds is 58 times or more.

  (Step S206) Since the monitoring control unit 402 has received a signal for a preset number of times (R times) in T seconds, the monitoring control unit 402 determines that the defrost fan 200 is operating normally (operation). Then, status information indicating that the defrost fan 200 is operating is transmitted to the host center 103 or the monitoring terminal 104.

  (Step S207) The monitoring control unit 402 clears the counter indicating the number of signal receptions, returns to the process of step S201, and repeatedly executes the same process.

  Next, the operation of the wireless sensor terminal 101 for relay will be described in detail. FIG. 12 is a flowchart showing the operation of the wireless sensor terminal 101 for relay. In FIG. 12, processing steps with the same reference numerals as in FIG. 10 show similar processing. In step S101 to step S103, power generation is performed by vibration generated by the rotation of the fan 203 of the anti-frost fan 200, and in step S104, the activation of the microcomputer is determined. The processing so far is the same as in FIG.

  (Step S151) When the microcomputer is activated, the wireless sensor terminal 101 stands by until a signal is received from another wireless sensor terminal 101. And the wireless sensor terminal 101 will progress to the process of step S152, if a signal is received.

  (Step S152) The wireless sensor terminal 101 retransmits the received signal (relay operation).

  In this way, the relay wireless sensor terminal 101 can perform a relay operation for retransmitting a signal transmitted from another wireless sensor terminal 101.

  Here, as described above, when the relay is performed by replacing the identification data 302a for each wireless sensor terminal 101, the wireless sensor terminal 101 for relay operates according to the flowchart shown in FIG. In FIG. 13, processing steps with the same reference numerals as those in FIG. 12 indicate similar processing. The difference from FIG. 12 is that the process of step S151a is executed between step S151 and step S152.

  (Step S151a) The wireless sensor terminal 101 determines whether or not the identification data 302a received in step S151 corresponds to the identification data 302a of the wireless sensor terminal 101 to be relayed. The wireless sensor terminal 101 proceeds to the process of step S152 when the identification data 302a is compatible with relay, and returns to step S104 when the identification data 302a is not compatible with relay.

  In this way, the relay wireless sensor terminal 101 can replace only the identification data 302a of the wireless sensor terminal 101 to be relayed with its own identification data 302a and retransmit it.

  In the above description, the case where the wireless monitoring device 102 cannot directly communicate with all the wireless sensor terminals 101 has been described. Here, the case where the wireless monitoring device 102 can directly communicate with all the wireless sensor terminals 101 will be described. .

  In FIG. 1, since the wireless monitoring device 102 transmits signals from five wireless sensor terminals 101, when the five wireless sensor terminals 101 transmit the same signal (unmodulated carrier signal) at the same frequency, The defrost fan 200 that is not operating cannot be identified. In this case, for example, by setting a different radio frequency for each wireless sensor terminal 101, the wireless monitoring device 102 can determine which frost-proof fan 200 has failed. For example, the radio frequencies (1) to (5) are allocated to the wireless sensor terminals 101 (1) to (5), respectively. If the wireless monitoring device 102 cannot receive the signal of the wireless frequency (3) assigned to the wireless sensor terminal 101 (3) within a preset time, the frost-proof fan 200 (3) has failed. Judge that

  Alternatively, if the unique identification data 302a is assigned to each wireless sensor terminal 101 as described above and a signal modulated by the identification data 302a is transmitted, the wireless monitoring device 102 can select which defrost fan. It is possible to determine whether 200 has failed. For example, identification data 302a (1) to (5) are assigned to the wireless sensor terminals 101 (1) to (5), respectively. If the wireless monitoring device 102 cannot receive the identification data 302a (4) assigned to the wireless sensor terminal 101 (4) within a preset time, the frost-proof fan 200 (4) has failed. Judge. In this case, since a plurality of wireless sensor terminals 101 use the same wireless frequency, carrier sense is performed before transmission so that signals do not collide.

  Thus, even when the wireless monitoring device 102 can directly communicate with all the wireless sensor terminals 101, the operating state of the defrost fan 200 can be monitored.

  As described above, as described in each embodiment, the wireless sensor terminal, the wireless monitoring device, and the wireless monitoring system of the present disclosure operate with the generated power and communicate wirelessly, so without greatly changing existing facilities, The operating state of the equipment can be monitored.

  Further, since the wireless sensor terminal 101 operates with electric power generated using the physical energy of the existing equipment, costs such as wiring and maintenance can be reduced.

  In addition, the wireless sensor terminal 101 periodically transmits a signal indicating that it is operating, and determines whether it is operating based on the number of receptions within a predetermined period. It is possible to monitor whether or not the defrosting fan 200 is operating.

  In each embodiment, the case where one wireless monitoring device 102 is installed in one field has been described, but the present invention can be similarly applied even when a plurality of wireless monitoring devices 102 are installed in one field.

  As described above, the wireless sensor terminal, the wireless monitoring device, and the wireless monitoring system of the present disclosure disclosed in the present disclosure operate by the generated power and communicate wirelessly, so that the operating state of the facility is not significantly changed without changing existing facilities. Can be monitored.

  From the above detailed description, features and advantages of the embodiments will become apparent. This is intended to cover the features and advantages of the embodiments described above without departing from the spirit and scope of the claims. Further, any person having ordinary knowledge in the technical field should be able to easily come up with any improvements and modifications, and there is no intention to limit the scope of the embodiments having the invention to those described above. It is also possible to rely on suitable improvements and equivalents within the scope disclosed in.

DESCRIPTION OF SYMBOLS 100 ... Wireless monitoring system; 101 ... Wireless sensor terminal; 102 ... Wireless monitoring apparatus; 103 ... Host center; 104 ... Monitoring terminal; 150 ... Network; 161 ... Operator; 200 ... Defrost fan; 201 ... Motor; 202 ... Rotating shaft; 203 ... Fan; 204 ... Strut; 301 ... Power generation unit; 302a ... identification data; 302b ... antenna; 303 ... control unit; 401 ... wireless communication unit; 401a ... antenna; 402 ... monitoring control unit; Identification data; 403... LAN communication unit

Claims (12)

Power generation means for converting physical energy generated during operation of the object into electrical energy;
At least one wireless sensor terminal attached to the object, comprising: terminal-side transmission means that operates by electrical energy output by the power generation means and transmits predetermined data;
Monitoring side receiving means for receiving the predetermined data transmitted from the terminal side transmitting means;
A radio monitoring system comprising: a radio monitoring device comprising: a monitoring unit that monitors a period at which the monitoring side receiving unit receives the predetermined data and determines an operating state of the object. The wireless monitoring system according to claim 1,
A plurality of the wireless sensor terminals;
The wireless sensor terminal is further provided with a terminal-side receiving means for receiving the predetermined data transmitted from the other wireless sensor terminal,
Set the wireless sensor terminal farthest from the wireless monitoring device as a specific wireless sensor terminal,
The specific wireless sensor terminal transmits the predetermined data from the terminal-side transmission unit,
The wireless sensor terminal excluding the specific wireless sensor terminal among the plurality of wireless sensor terminals receives the predetermined data transmitted by the other wireless sensor terminals including the specific wireless sensor terminal by the terminal side receiving unit. The wireless monitoring system, wherein the wireless monitoring system receives the data sequentially, and sequentially transmits the received predetermined data from the terminal-side transmission unit. The wireless monitoring system according to claim 2,
The predetermined data transmitted by the wireless sensor terminal is identification data different for each wireless sensor terminal,
The specific wireless sensor terminal transmits the identification data of the own device from the terminal-side transmission unit,
The wireless sensor terminals excluding the specific wireless sensor terminal among the plurality of wireless sensor terminals receive the identification data transmitted by the other wireless sensor terminals including the specific wireless sensor terminal by the terminal-side receiving unit. Then, when the received identification data is the specific identification data set in advance, the identification data of the own device is transmitted from the terminal side transmission means. The wireless monitoring system according to any one of claims 1 to 3,
The monitoring means counts the number of times the predetermined data transmitted by the wireless sensor terminal is received, and when the number of counts within a preset time is greater than or equal to a preset number, the object is in an operating state. A wireless monitoring system, characterized in that, when the number of counts within a preset time is less than a preset number of times, the object is determined to be in an inoperative state. In the radio surveillance system according to any one of claims 1 to 4,
The wireless monitoring system, wherein the object is a frost-proof fan for preventing frost from adhering to agricultural products. Power generation means for converting physical energy generated during operation of the object into electrical energy;
A wireless sensor terminal comprising: a terminal-side transmission unit that operates by electric energy output from the power generation unit and transmits predetermined data. The wireless sensor terminal according to claim 6,
When comprising a plurality of the wireless sensor terminals,
The wireless sensor terminal is further provided with a terminal-side receiving means for receiving the predetermined data transmitted from the other wireless sensor terminal,
One of the plurality of wireless sensor terminals is set as a specific wireless sensor terminal,
The specific wireless sensor terminal transmits the predetermined data from the terminal-side transmission unit,
The wireless sensor terminal excluding the specific wireless sensor terminal among the plurality of wireless sensor terminals receives the predetermined data transmitted by the other wireless sensor terminals including the specific wireless sensor terminal by the terminal side receiving unit. A wireless sensor terminal characterized by receiving sequentially and transmitting the received predetermined data sequentially from the terminal-side transmitting means. The wireless sensor terminal according to claim 7,
The predetermined data transmitted by the wireless sensor terminal is identification data different for each wireless sensor terminal,
The specific wireless sensor terminal transmits the identification data of the own device from the terminal-side transmission unit,
The wireless sensor terminals excluding the specific wireless sensor terminal among the plurality of wireless sensor terminals receive the identification data transmitted by the other wireless sensor terminals including the specific wireless sensor terminal by the terminal-side receiving unit. Then, when the received identification data is the specific identification data set in advance, the identification data of the own device is transmitted from the terminal-side transmission unit. In the wireless sensor terminal according to any one of claims 6 to 8,
The wireless sensor terminal, wherein the object is a frost-proof fan for preventing frost from adhering to a crop. Monitoring-side receiving means for receiving predetermined data transmitted from a wireless sensor terminal that transmits data during operation of the object;
A radio monitoring apparatus comprising: monitoring means for monitoring a period at which the monitoring side receiving means receives the predetermined data to determine an operating state of the object. The wireless monitoring device according to claim 10, wherein
The monitoring means counts the number of times the predetermined data transmitted by the wireless sensor terminal is received, and when the number of counts within a preset time is greater than or equal to a preset number, the object is in an operating state. Yes, the wireless monitoring device, wherein when the number of counts within a preset time is less than a preset number of times, it is determined that the object is in an inoperative state. The wireless monitoring device according to claim 10 or 11,
The wireless monitoring device according to claim 1, wherein the object is a frost-proof fan for preventing frost from adhering to a crop.

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