JP7329403B2 - Information gathering system - Google Patents

Description

The present invention relates to an information collection system that wirelessly communicates signals between a battery-powered measuring device and a monitoring device, and in particular, it can respond to changes in the measurement environment while suppressing battery consumption and reducing running costs. The present invention relates to an information collection system capable of varying the interval at which measurement data signals are transmitted.

With the recent advancement of IoT and AI technologies, we have deployed many sensor devices over a wide area and analyzed the large amount of data obtained from them to collect highly accurate and advanced information or create new It has become possible to extract such information. Under such circumstances, how to collect a large amount of data has become one of the issues.

For example, in response to local abnormal rainfall such as torrential downpours and guerrilla downpours that occur in recent years due to abnormal weather, water level gauges are placed over a wide area, and water level data of rivers, etc. is sent from the observation station (sensor terminal) to the center station. An information collection system for collecting information is disclosed in Patent Document 1.

Japanese Patent No. 4801949

In the conventionally proposed information collection system, data transmitted from a plurality of measuring devices are collected by a single monitoring device. "Polling" was performed to send data from the measuring device to the monitoring device in response to the However, in such a configuration, it is necessary to keep the receiving device and the like of the measuring device in an operating state at all times. Therefore, if a configuration in which a large-capacity battery is mounted is adopted, the cost of the device increases. In addition, if a battery with a small capacity is used in order to reduce the cost of the device, there is a problem that the battery must be replaced frequently, resulting in an increase in running cost. SUMMARY OF THE INVENTION It is an object of the present invention to provide an information collection system capable of extending the driving time of a measuring device even when using a small-capacity battery as a power source. Furthermore, the present invention is an information collection system capable of appropriately collecting information by changing from a measurement mode with a long measurement interval to a measurement mode with a short measurement interval correspondingly when it is necessary to perform measurements at short intervals. intended to provide

In order to achieve the above object, the invention according to claim 1 of the present application provides a measuring device that transmits measurement results of a sensor device as a measurement data signal at predetermined intervals, and a plurality of measurement devices that transmit the measurement data signals. In an information collection system comprising a monitoring device that receives signals and transmits response signals to the measuring device, the measuring device includes a control unit that uses a battery as a power source and switches the operating state and non-operating state of the sensor device and the transmitting/receiving unit. The control unit of the measuring device changes the sensor device and the transmitting/receiving unit from a non-operating state to an operating state, transmits the measurement result of the sensor device to the monitoring device as the measurement data signal, and transmits the measurement data signal from the monitoring device to the After receiving a response signal, it is switched from the active state to the non-active state, and at a predetermined interval, the non-active state is switched to the active state to transmit the next measurement data signal to the monitoring device , and the monitoring device receives the measurement data. A control unit for analyzing a signal and determining whether or not it is necessary to change the measurement mode of the measuring device that transmitted the measurement data signal, wherein the control unit of the monitoring device transmits the measurement data signal. Transmission and reception of the next measurement data signal and the response signal after receiving the measurement data signal performed between the measurement device and the monitoring device is performed between the other measurement device and the monitoring device. a response signal that controls the timing of transmitting the next measurement data signal from the measurement device so as not to overlap the transmission and reception of the response signal after receiving the signal and the measurement data signal, and the measurement mode; If it is determined that it is necessary to change the measurement mode, it includes a measurement mode change signal, and if it is determined that it is not necessary to change the measurement mode, it includes a response signal that does not include the measurement mode change signal or includes a measurement mode continuation signal. and transmitting the measurement data signal to the measuring device that transmitted the measurement data signal .

The invention according to claim 2 of the present application is the information collection system according to claim 1, wherein the monitoring device comprises a data collection unit and a data storage unit for storing data collected by the data collection unit, and the monitoring device The control unit of (1) includes analysis of the data stored in the data storage unit in determining whether or not it is necessary to change the measurement mode of the measurement device.

The invention according to claim 3 of the present application is the information collection system according to claim 2 , wherein the measuring device has a data storage unit that stores at least part of the data collected by the data collecting unit provided in the monitoring device. wherein the control unit of the measurement device analyzes the measurement data and the data stored in the data storage unit of the measurement device to determine whether it is necessary to change the measurement mode, and changes the measurement mode to If it is determined that a change is necessary, a measurement mode change request signal is transmitted to the monitoring device together with the measurement data signal, and the control unit of the monitoring device needs to change the measurement mode of the measurement device. The determination as to whether or not the measurement mode change request signal is analyzed includes analysis of the measurement mode change request signal .

The invention according to claim 4 of the present application is the information collection system according to claim 1 or 2 , wherein the measuring device includes a data storage unit for storing measurement data of the measuring device , and the control unit of the measuring device comprises the Analyze the measurement data and the past measurement data of the own device stored in the data storage unit of the measurement device to determine whether or not the measurement mode needs to be changed, and determine that the measurement mode needs to be changed. If so, a measurement mode change request signal is transmitted to the monitoring device together with the measurement data signal, and the control unit of the monitoring device judges whether or not it is necessary to change the measurement mode of the measurement device. , analysis of the measurement mode change request signal .

In the information gathering system of the present invention, the measuring device spontaneously enters an operating state at a predetermined time according to the timer, and after the predetermined operation is completed, the transmitting/receiving unit, the sensor device, etc. enter a non-operating state. Lengthening the non-operating period of the measuring device by configuring to receive from the monitoring device a response signal instructing the timing of transmitting the next measurement data signal from the measuring device to the monitoring device during the period of the operating state. This greatly reduces battery consumption of the measuring device compared to polling, which requires the receiving device of the measuring device to be always on.

On the other hand, if the measurement interval is lengthened in order to suppress the consumption of the battery of the measuring device, it becomes impossible to observe data such as the amount of water that changes rapidly in a short period of time. It can be changed quickly. For example, when it is determined that the measurement interval needs to be changed from the data stored by the data storage unit of the monitoring device, or when it is determined that the measurement interval needs to be changed from changes in the measurement data of the measurement device. Also, by transmitting a response signal for changing the measurement mode from the monitoring device or by requesting the change of the measurement mode from the measuring device, it is possible to measure data that changes in a short period of time.

In addition, in order to prevent battery consumption due to retransmission of measured data due to overlap of measurement data transmission timings among multiple measurement devices, the timing of transmission and reception between the monitoring device and each measurement device can be controlled. Battery consumption can be reduced, the measuring device can be operated for a long time, and running costs can be reduced.

1 is an explanatory diagram of an information collection system according to a first embodiment of this invention; FIG. It is a figure explaining transmission and reception of the signal of the information collection system of the 1st Example of this invention at the time of normal. FIG. 4 is a diagram for explaining transmission and reception of signals when the measurement mode is changed in the information collection system according to the first embodiment of the present invention; FIG. 4 is a diagram for explaining transmission and reception of signals during timing correction in the information collection system according to the first embodiment of the present invention; FIG. 10 is an explanatory diagram of an information collection system according to a second embodiment of the present invention; FIG. 10 is a diagram for explaining transmission and reception of signals in the information collection system according to the second embodiment of the present invention when changing the measurement mode; FIG. 11 is an explanatory diagram of an information collection system according to a third embodiment of the present invention; FIG. 10 is an explanatory diagram of signals transmitted and received in the third embodiment of the present invention;

The information collection system of the present invention uses a small-capacity battery as a power source, and includes a measuring device that transmits the measurement results of the sensor device as a measured data signal at predetermined intervals, and a monitoring device that receives the measured data signals from a plurality of measuring devices. It has In addition, it is characterized by controlling the operation of the measuring device so as to suppress consumption of the battery. Hereinafter, the embodiment of the present invention will be described by taking as an example the case of collecting water level data etc. of a river.

A first embodiment of the present invention will be described. FIG. 1 is an explanatory diagram of an information gathering system according to a first embodiment of the present invention, which comprises three measuring devices 10-1 to 10-3 and a monitoring device 20 for controlling them.

Each of the measuring devices 10-1 to 10-3 has a transmitting/receiving section 12 whose operation is controlled by the control section 11, a sensor device 13, and a battery 14 that supplies power to these devices. The measurement devices 10-1 to 10-3 are fixed to a river bridge or the like to be measured. As the sensor device 13, a water level meter or a current meter can be used, and one measuring device can be provided with one or a plurality of sensor devices.

On the other hand, the monitoring device 20 includes a transmitting/receiving section 22 whose operation is controlled by a control section 21 in order to transmit and receive signals with a plurality of measuring devices 10-1 to 10-3. Monitoring device 20 is generally installed in a building.

An information collection system including the measuring devices 10-1 to 10-3 and the monitoring device 20 configured as described above needs to continue measurement for a long period of time. At that time, if the batteries 14 of the measuring devices 10-1 to 10-3 are quickly exhausted, the running cost for replacement will increase. Therefore, in order to suppress consumption of the battery 14, it is necessary to shorten the operation time of the measuring devices 10-1 to 10-3 as much as possible.

The measuring and monitoring devices operate as follows. First, the operation of transmitting and receiving signals between the measuring device 10-1 and the monitoring device 20 will be described. When the measuring device 10-1 is activated for the first time, or when it is activated again after being deactivated after activation, power is supplied from the battery 14 to the sensor device 13, and predetermined measurements such as water level and water flow are performed. In order to transmit this measurement result to the monitoring device 20, the transmitting/receiving section 12 is also supplied with power and transmits the measurement data signal to the monitoring device 20 which is always in operation. The monitoring device 20, which has received the measurement data signal by the transmitting/receiving section 22, transmits a predetermined response signal to the measuring device 10-1. The measuring device 10-1, which has received this response signal in the transmitting/receiving section 12, stops operating (enters a non-operating state) except for timers and the like necessary for carrying out the next operating state. After a predetermined period of time has passed, the device is put into operation again, and the above operation is repeated. Similar operations are performed in the measuring devices 10-2 and 10-3. Transmission and reception of signals between the measuring devices 10-1 to 10-3 and the monitoring device 20 can also be performed via repeaters.

The measurement result of the sensor device 13 is transmitted from the measuring device 10-1 to the monitoring device 20 as a measurement data signal. As shown in FIG. 2(a), the measurement data signal transmitted from the measurement device 10-1 includes the measurement data of the sensor device 13 and an identification signal identifying the measurement device 10-1 among the plurality of measurement devices. contains. It is also possible to include a measurement mode signal indicating the signal transmission/reception interval currently set for the measurement device 10-1. Note that this measurement mode signal is not always essential because if the current measurement mode of the measurement device 10-1 is recorded in the monitoring device 20, the measurement mode can be known only by receiving the identification signal.

Upon receiving the measurement data signal from the measuring device 10-1, the monitoring device 20 transmits a response signal to the measuring device 10-1. As shown in FIG. 2(b), this response signal includes the above identification signal and an acknowledgment signal indicating that the measurement data signal has been received. It may also include a measurement mode change signal.

The change of the measurement mode is determined by the monitoring device 20 . Specifically, the measurement data signal received by the transmission/reception unit 22 is analyzed by the control unit 21, and whether or not to change the timing (time, interval, etc.) of transmitting the next measurement data signal from the measurement device 10-1 to the monitoring device 20 is determined. or, in other words, whether or not the measurement mode should be changed. The criteria for determining whether to change the measurement mode may be determined by the control unit 21 by comparing with predetermined conditions. As an example of the judgment criteria, "When the difference between the water level data at the steady state and the water level measurement data obtained from the current measurement data signal increases by 10% or more, the measurement interval is changed from 30 minutes to 15 minutes. Change to". Also, the criterion may be such that when the measurement mode of one measuring device is changed, the measurement mode of another measuring device is changed. Various criteria may be set for this determination.

When it is determined to change the measurement mode, it transmits a response signal including a measurement mode change signal as shown in FIG. 2(b) to the measuring device 10-1. The measurement apparatus 10-1 that has received this measurement mode change signal changes its measurement mode so that it transmits a measurement data signal at intervals of 15 minutes as a newly set measurement mode. If it is not necessary to change the measurement mode (to maintain the current measurement mode), a response signal that does not include the measurement mode change signal may be used as a response signal to continue the current measurement mode, or a separate measurement mode may be used. A continuation signal may be transmitted and received.

FIG. 2(c) is an explanatory diagram of transmission and reception of signals between the three measuring devices 10-1 to 10-3 and the monitoring device 20. FIG. When the water level of a river is measured for a long period of time, the water level does not fluctuate significantly during a steady state without rainfall or the like. For example, when the measurement mode is set such that measurement data signals are transmitted from the measurement devices 10-1 to 10-3 every 30 minutes and a response signal is transmitted from the monitoring device 20, the operation is as follows.

A measurement data signal (transmission measurement data signal 1a) is transmitted from the measurement device 10-1 which is activated at a predetermined time and has performed a predetermined measurement with the sensor device, and the monitoring device 20 receives the measurement data signal (reception measurement data signal 1a). ).

The monitoring device 20 that has received the measurement data signal transmits a response signal (transmission response signal 1A), and the measurement device 10-1 receives the response signal (reception response signal 1A). It is determined that the measurement mode is continued without changing the measurement mode when there is no change in the water level in the steady state. Therefore, the transmission/reception unit 22 of the monitoring device 20 transmits a response signal that does not include a measurement mode change signal or a response signal that includes a measurement mode continuation signal.

After receiving the response signal, the measuring device 10-1 operates the transmitting/receiving unit 12, the sensor device 13, and the control device 10-1 except for the timer necessary for transmitting the next measurement data signal 30 minutes after the transmission of the previous measurement data signal. The part 11 is put into a non-operating state.

After the predetermined time measured by the timer has passed, the measurement device 10-1 is brought into the operating state to transmit the next measurement data signal, and the above operation is repeated to transmit the measurement data signal (the transmission measurement data signal and the reception measurement data signal 1b, 1c, 1d) are sequentially transmitted and received, and corresponding response signals (transmission response signals and reception response signals 1B, 1C, 1D) are sequentially transmitted and received.

By the way, as shown in FIG. 1, in a normal information collection system, measurement data signals and response signals are transmitted and received between a plurality of measuring devices that repeat intermittent operations and one monitoring device 20 . Specifically, measurement data signals (transmission measurement data signals and reception measurement data signals 2a, 2b, 2c, 2d) are sequentially transmitted and received between the measurement device 10-2 and the monitoring device 20, and corresponding response signals ( Transmission response signals and reception response signals 2A, 2B, 2C, and 2D) are sequentially transmitted and received, and measurement data signals (transmission measurement data signals and reception measurement data signals 3a, 3b, 3c) are sequentially transmitted and received, and response signals (transmission response signals and reception response signals 3A, 3B, 3C) responding thereto are sequentially transmitted and received.

As shown in FIG. 2(c), the measuring devices 10-1 to 10-3 are in a short operating state from when they are activated to transmit the measurement data signal to when they receive the response signal from the monitoring device 20. It becomes non-operating state. Therefore, receiving the response signal promptly after activation reduces consumption of the battery 14 of each of the measuring devices 10-1 to 10-3.

Therefore, monitoring device 20 controls the timing of receiving measurement data signals transmitted from measuring devices 10-1 to 10-3 and the timing of transmitting response signals to measuring devices 10-1 to 10-3. there is

As described above, the measuring devices 10-1 to 10-3 transmit measurement data signals to the monitoring device 20 every 30 minutes when they become operational, receive response signals transmitted from the monitoring device 20, and Repeated intermittent operation to reach the operating state. Here, measuring device 10-2 transmits the measured data signal so as not to overlap with the measured data signals transmitted from measuring devices 10-1 and 10-3. In the example shown in FIG. 2(c), the measurement device 10-2 transmits the measurement data signal (transmission measurement data signal 1a) ten minutes after the measurement device 10-1 starts transmission of the measurement data signal 2a) is sent. Twenty minutes after the measurement device 10-1 started transmission of the measurement data signal (transmission measurement data signal 1a), the measurement device 10-3 transmitted the measurement data signal (transmission measurement data signal 1a) to the measurement device 10-3. It is controlled to transmit the measurement data signal (transmission measurement data signal 3a) 10 minutes after the start of transmission of the signal 2a).

Monitoring device 20 also receives a measurement data signal (received measurement data signal 1a) transmitted from measurement device 10-1, transmits a response signal (transmission response signal 1A), and then receives a response signal (transmission response signal 1A) transmitted from measurement device 10-2. receive the measured data signal (received measured data signal 2a), transmit a response signal (transmitted response signal 2A), and then receive the measured data signal (received measured data signal 3A) transmitted from the measuring device 10-3. to transmit a response signal (transmission response signal 3A). Thereafter, the measurement data signals (received measurement data signals 1b, 2b, 3b, 1c, 2c, 3c, 1d, 2d . ) are transmitted.

By controlling the transmission and reception of signals in this way, the measurement devices 10-1 to 10-3 can receive the response signal promptly after transmitting the measurement data signal, and control the operation time of each device to the minimum necessary. becomes possible. As a result, it is possible to minimize consumption of the battery 14 mounted on each of the measuring devices 10-1 to 10-3.

Note that the timers built into monitoring device 20 and measurement devices 10-1 to 10-3 each have an error. -3 to the monitoring device 20 may be transmitted at the same timing. In such a case, the measuring devices 10-1 to 10-3 have to retransmit the measurement data signal and the like, which consumes the battery 14. FIG. Therefore, it is necessary to correct the timing based on the timer built in the monitoring device 20 so that the transmission and reception timings do not overlap due to such a timing shift. For example, if the timing at which the measurement data signals transmitted from each of the measuring devices 10-1 to 10-3 are received deviates from the time managed by the monitoring device 20, each of the measuring devices 10-1 to 10-3 may be controlled so as to correct the shift in transmission timing of the measurement data signal. Specifically, each of the monitoring devices 20 sends a response signal for transmitting the next measurement data signal from each of the measuring devices 10-1 to 10-3 in accordance with the reception timing of the measurement data signal managed by the monitoring device 20. It is only necessary to transmit the data to the measurement devices 10-1 to 10-3, and control the control unit 11, the transmission/reception unit 12, and the sensor device 13 so as to be activated in accordance with the corrected timing.

Next, the case where the water level fluctuates greatly due to rainfall or the like will be described. When the monitoring device 20 analyzes the received measurement data signal and determines that it is necessary to change the measurement mode, it transmits a response signal including a measurement mode change signal as shown in FIG. 2(b). do. FIG. 3 is an explanatory diagram of transmission and reception of signals between the measuring devices 10-1 to 10-3 and the monitoring device 20. FIG. For example, from a state set to a measurement mode in which measurement data signals are transmitted from the measurement devices 10-1 to 10-3 every 30 minutes and a response signal is transmitted from the monitoring device 20, the measurement device 10-1, When the measurement mode of 10-3 is not changed and only the measurement device 10-2 is changed to the measurement mode in which the measurement data signal is transmitted every 15 minutes, the operation is as follows.

A measurement data signal (transmission measurement data signal 1a) is transmitted from the measurement device 10-1, and the monitoring device 20 receives the measurement data signal (reception measurement data signal 1a).

Upon receiving the measurement data signal (received measurement mode signal 1a), the monitoring device 20 analyzes the result in the control section 21 and determines that it is not necessary to change the measurement mode. A response signal (transmission response signal 1A) is transmitted from the transmission/reception unit 22 of the monitoring device 20, and the measurement device 10-1 receives the response signal (reception response signal 1A). Since the measurement mode of measurement device 10-1 is not changed, transmission/reception section 22 of monitoring device 20 transmits a response signal that does not include a measurement mode change signal or a response signal that includes a measurement mode continuation signal.

After receiving the response signal, the measuring device 10-1 starts transmitting/receiving section 12 except for the timer required to transmit the next measurement data signal 30 minutes after the transmission of the previous measurement data signal (transmission measurement data signal 1a). , the sensor device 13 and the control unit 11 are put into a non-operating state.

After the predetermined time measured by the timer has passed, the measurement device 10-1 is brought into the operating state to transmit the next measurement data signal, and the above operation is repeated to transmit the measurement data signal (the transmission measurement data signal and the reception measurement data signal 1b, 1c, 1d) are sequentially transmitted and received, and corresponding response signals (transmission response signals and reception response signals 1B, 1C, 1D) are sequentially transmitted and received.

10 minutes after the measurement device 10-1 started transmitting the measurement data signal (transmission measurement data signal 1a), the measurement device 10-2 transmitted the measurement data signal (transmission measurement data signal 2a), and the monitoring device 20 The measurement data signal (received measurement data signal 2a) is received.

Upon receiving the measurement data signal, the monitoring device 20 analyzes the result in the control section 21 . For example, if the water level data obtained from the current measurement data signal is compared with the normal water level data and the water level data increases by 10% or more, the measurement mode is changed so that the measurement of the measuring device 10-2 is performed every 15 minutes. make a judgment. In this case, a response signal (transmission response signal 2A) including a measurement mode change signal as shown in FIG. 2(b) is transmitted to the measuring device 10-2.

Upon receiving the response signal (reception response signal 2A) including the measurement mode change signal, the measurement device 10-2 follows the response signal to transmit the next measurement data signal 15 minutes after the transmission time of the previous measurement data signal. The transmitter/receiver 12, the sensor device 13, and the controller 11 are put into a non-operating state, except for necessary timers and the like.

After the predetermined time measured by the timer has passed, the measuring device 10-2 is put into the operating state to transmit the next measured data signal, and the measured data signal (transmitted measured data signal 2b) is transmitted. A measurement data signal (received measurement data signal 2b) is received.

Upon receiving the measurement data signal, the monitoring device 20 analyzes the result in the control unit 21, determines to maintain the measurement mode changed from the normal measurement mode (measurement every 15 minutes), and maintains the changed measurement mode. A response signal (transmission response signal 2B) is transmitted to the measuring device 10-2.

After receiving the response signal (reception response signal 2B), the measuring device 10-2 follows the response signal, except for the timer required to transmit the next measurement data signal 15 minutes after the transmission of the previous measurement data signal. , the transmitting/receiving section 12, the sensor device 13 and the control section 11 are put into a non-operating state.

After the predetermined time measured by the timer has passed, the measuring device 10-2 is brought into operation in order to transmit the next measurement data signal, the above operation is repeated, and the measurement data signal (the transmission measurement data signal and the reception measurement data signal 2c to 2g) are sequentially transmitted and received, and corresponding response signals (transmission response signals and reception response signals 2C to 2G) are sequentially transmitted and received. After the water level returns to the steady state, the control unit 21 of the monitoring device determines that the measurement mode is changed so that the measurement of the measuring device 10-2 is performed at intervals of 30 minutes. Can be changed to state measurement mode.

Twenty minutes after the measurement device 10-1 started transmitting the measurement data signal (transmission measurement data signal 1a), and the measurement device 10-2 started transmission of the measurement data signal (transmission measurement data signal 2a). After 10 minutes, the measurement device 10-3 transmits a measurement data signal (transmission measurement data signal 3a), and the monitoring device 20 receives the measurement data signal (reception measurement data signal 3a).

The monitoring device 20 that has received the measurement data signal transmits a response signal (transmission response signal 3A), and the measurement device 10-3 receives the response signal (reception response signal 3A). It is determined that the measurement mode is maintained without changing the measurement mode when there is no change in the water level in the steady state. Therefore, the transmission/reception unit 22 of the monitoring device 20 transmits a response signal including the measurement mode continuation signal or a response signal not including the measurement mode change signal.

After receiving the response signal, the measuring device 10-3 operates the transmitting/receiving unit 12, the sensor device 13, and the control device 10-3, except for the timer required to transmit the next measured data signal 30 minutes after the transmission of the previous measured data signal. The part 11 is put into a non-operating state.

After the predetermined time measured by the timer has passed, the measuring device 10-3 is brought into operation to transmit the next measurement data signal, the above operation is repeated, and the measurement data signal (the transmission measurement data signal and the reception measurement data signal 3b, 3c, 3d) are sequentially transmitted and received, and corresponding response signals (transmission response signals and reception response signals 3B, 3C, 3D) are sequentially transmitted and received.

In this manner, the measuring devices 10-1 and 10-3 transmit measurement data signals to the monitoring device 20 every 30 minutes, and the measuring device 10-2 after changing the measurement mode every 15 minutes. However, even if the intermittent operation of receiving the response signal transmitted from the monitoring device 20 and becoming inactive is repeated, the timing of transmission and reception of the measurement data signals transmitted from the measurement devices 10-1 to 10-3 is different. They can be made so that they do not overlap each other. In the example shown in FIG. 3, the measurement device 10-2 transmits the measurement data signal (transmission measurement data signal 2a) 10 minutes after the measurement device 10-1 starts transmission of the measurement data signal (transmission measurement data signal 1a). 10 minutes later, the measurement device 10-3 transmits a measurement data signal (transmission measurement data signal 3a), and 5 minutes later, the measurement device 10-2 transmits a measurement data signal (transmission measurement data signal 2b), Five minutes later, the measuring device 10-1 is controlled to transmit a measurement data signal (transmission measurement data signal 1b).

In response to this, control device 20 receives a measurement data signal (received measurement data signal 1a) transmitted from measuring device 10-1, transmits a response signal (transmission response signal 1A), and then receives measurement data signal (received measurement data signal 1a) from measuring device 10-1. receives the measurement data signal (received measurement data signal 2a) transmitted from the measuring device 10-3, transmits a response signal (transmission response signal 2A), and then transmits the measurement data signal (received measurement data signal 3A) transmitted from the measuring device 10-3. and transmit a response signal (transmission response signal 3A), receive a measurement data signal (reception measurement data signal 2b) transmitted from the measuring device 10-2, and transmit a response signal (transmission response signal 2B). . After that, the measurement data signals (received measurement data signals 1b, 2c, 3b, 2d, 1c, 2e, 3c, 2f, 1d, 2g, . response signals (transmission response signals 1B, 2C, 3B, 2D, 1C, 2E, 3C, 2F, 1D, 2G, . . . ).

By controlling the transmission and reception of the data signals in this way, the measurement devices 10-1 to 10-3 can receive the response signals promptly after transmitting the measurement data signals, thereby minimizing the operation time of each. It becomes possible to As a result, it is possible to minimize consumption of the battery 14 mounted on each measuring device.

As described above, the timing of transmission and reception of data signals is controlled by the monitoring device 20 . Such control is also performed to correct the timing of data signal transmission/reception that occurs suddenly. For example, as shown in FIG. 4, in the transmission and reception of the data signal described above with reference to FIG. This example shows an example in which communication is not possible due to electromagnetic noise, etc., and delays occur due to repeated retransmissions. For example, the measurement apparatus 10-1 is set to a measurement mode in which transmission of the next measurement data signal (transmission measurement data signal 1b) is started 30 minutes after transmission of the measurement data signal (transmission measurement data signal 1a) is started. If the monitoring device 20 receives the measurement data signal (the transmission measurement data signal 1b) with a delay of 2 minutes, the monitoring device 20 compares the transmission/reception schedule with the preset transmission/reception schedule, and the next measurement data signal The timing for starting transmission of (transmission measurement data signal 1c) is corrected to 28 minutes after the start of transmission of the measurement data signal (transmission measurement data signal 1a). Specifically, the measuring device 10-1 and the monitoring device 20 operate as follows.

A measurement data signal (transmission measurement data signal 1a) is transmitted from the measurement device 10-1, and the monitoring device 20 receives the measurement data signal (reception measurement data signal 1a).

The monitoring device 20 desiring to receive the measurement data signal transmits a response signal (transmission response signal 1A), and the measurement device 10-1 receives the response signal (reception response signal 1A). This response signal instructs to send the next measurement data signal after 30 minutes.

After receiving the response signal, the measuring device 10-1 operates the transmitting/receiving unit 12, the sensor device 13, and the control device 10-1 except for the timer necessary for transmitting the next measurement data signal 30 minutes after the transmission of the previous measurement data signal. The part 11 is put into a non-operating state.

After the predetermined time measured by the timer has elapsed, the measuring device 10-1 is brought into operation to transmit the next measurement data signal, and the measurement data signal (transmission measurement data signal 1b) is transmitted. Here, it is assumed that the transmission time is delayed by 2 minutes due to repeated retransmissions due to interference with other communications, electromagnetic noise, or the like.

The monitoring device 20 that has received the measurement data signal (received measurement data signal 1b) detects that this reception is delayed for 2 minutes, and includes a measurement mode change signal so that the next measurement data signal will be transmitted after 28 minutes. A response signal (transmission response signal 1B) is transmitted.

The measuring device 10-1 that has received this response signal (receiving response signal 1B) removes the timer and the like necessary for transmitting the next measurement data signal 28 minutes after the transmission time of the previous measurement data signal. 12, the sensor device 13 and the control unit 11 are put into a non-operating state.

After the predetermined time measured by the timer has passed, the measuring device 10-1 is brought into the operating state and the measurement data signal (transmission measurement data signal 1c) is transmitted in order to transmit the next measurement data signal. This transmission has normal timing.

Upon receiving the measurement data signal (received measurement data signal 1c), the monitoring device 20 determines that this reception is transmission at normal timing, and sends a measurement mode change signal to transmit the next measurement data signal 30 minutes later. A response signal (transmission response signal 1C) containing

By quickly correcting a sudden shift in the transmission and reception timing of the measurement data signal in this way, even when it is necessary to transmit and receive signals frequently during rainfall, the measurement devices 10-1 to 10-3 can When a measurement data signal is transmitted, a response signal can be received quickly, and each operation time can be minimized. As a result, it is possible to minimize consumption of the battery 14 mounted on each measuring device.

Next, a second embodiment will be described. In the first embodiment described above, the case where the measurement mode is changed after confirming that the measurement data of the measurement device has changed has been described. However, such a method may not be able to cope with sudden changes in the water level. Therefore, it is possible to change the measurement mode before the measurement data changes.

FIG. 5 is an explanatory diagram of the information collection system of the second embodiment. Since the monitoring device 20A of the present embodiment transmits and receives signals to and from the three measurement devices 10-1 to 10-3 as in the first embodiment, the control unit 21 controls the transmission and reception of signals. A unit 22 is provided, and further a data storage unit 23 and a data collection unit 30 are provided.

The control unit 21 determines from the data stored in the data storage unit 23 whether or not to change the measurement mode of each of the measurement devices 10-1 to 10-3. Data stored in the data storage unit 23 is collected by the data collection unit 30 . For example, the data collection unit 30 can obtain current radar rainfall and rainfall forecast data from the Meteorological Agency or the like via the Internet line. Image data can be obtained from surveillance cameras. The history information storage unit can store information such as how the water level changed in the past when it rained at the locations where the measuring devices 10-1 to 10-3 are installed or in the surrounding areas. . The data collected by the data collection unit 30 are stored in the data storage unit 23 as appropriate. The data collection unit 30 may also be controlled to collect necessary data from the control unit 21 and store the data in the data storage unit 23 .

In the information collection system including the measuring devices 10-1 to 10-3 and the monitoring device 20A configured as described above, the water level does not fluctuate significantly during normal times when there is no actual rainfall or rainfall prediction, so data storage is performed. There is no need to store data in the unit 23 that would require changing the measurement mode.

On the other hand, if there is rain but there is no change in the measurement data or if rain is predicted, the stored data is obtained from the data storage section 23 and the control section 21 determines whether or not to change the measurement mode. . FIG. 6 is an explanatory diagram of transmission and reception of signals between the measuring devices 10-1 to 10-3 and the monitoring device 20A when the mode is changed by prediction. For example, the measurement devices 10-1, 10-2, and 10-3 are installed in this order from the upstream side of the river, the data collection unit 30 collects data from the Meteorological Agency, etc., and the measurement device 10-1 and the measurement device 10- 2, or the data that rainfall is predicted in the upstream side of a tributary that merges into the basin between them is stored in the data storage unit 23 . The collected data also includes predictions of rainfall and when it will start. If a sudden change in water level is expected from the predicted rainfall amount, or if it is not sudden, there is a possibility that the measurement will be delayed at the set timing (measurement every 30 minutes). In such a situation, the control unit 21 determines whether or not to change the transmission timing of the measurement data signal of each of the measuring devices 10-1 to 10-3.

A measurement data signal (transmission measurement data signal 1a) is transmitted from the measurement device 10-1, and the monitoring device 20 receives the measurement data signal (reception measurement data signal 1a).

Upon receiving the measurement data, the monitoring device 20A determines by the control section 21 that it is not necessary to change the measurement mode including the data stored in the data storage section 23 .

A measurement data signal (transmission measurement data signal 2a) is transmitted from the measurement device 10-2, and the monitoring device 20A receives the measurement data signal (reception measurement data signal 2a).

Upon receiving the measurement data signal (received measurement data signal 2a), the monitoring device 20A uses the control section 21 to determine whether or not to change the measurement mode. Here, even if it is determined that it is not necessary to change the measurement mode based only on the measurement data signal, the data stored in the data storage unit 23 (for example, the prediction that the water level is expected to rise in 10 minutes) data). In this case, if the next water level measurement is performed after 30 minutes, the measurement will be performed after the water level fluctuates greatly. This delays alerting the surrounding areas to the rising water level. Therefore, it is determined that it is necessary to change the measurement mode.

A response signal (transmission response signal 2A) including a measurement mode change signal is transmitted from the monitoring device 20A to change the measurement mode of the measurement device 10-2. The following description of the operation is the same as the above operation.

A measurement data signal (transmission measurement data signal 3a) is transmitted from the measurement device 10-3, and the monitoring device 20A receives the measurement data signal (reception measurement data signal 3a).

Upon receiving the measurement data signal (received measurement data signal 3a), the monitoring device 20A makes the same determination as when receiving the measurement data signal (received measurement data signal 2a) from the measurement device 10-2, and outputs a measurement mode change signal. to change the measurement mode of the measuring device 10-3. The following description of the operation is the same as the above operation.

By collecting the data that serves as the basis for determining whether to change the measurement mode in this way, it is possible to appropriately change the measurement mode before the actual water level changes.

A third embodiment will now be described. In the second embodiment, the data storage unit 23 is provided in the monitoring device 20A, but the data storage unit 23A may be provided in each of the measurement devices 10A-1 to 10A-3.

FIG. 7 is an explanatory diagram of the information collection system of the third embodiment. The measuring devices 10A-1 to 10A-3 of this embodiment are provided with a data storage section 23A for storing data measured by the device itself.

By equipping the measuring devices 10A-1 to 10A-3 with the data storage unit 23A, each of the measuring devices 10A-1 to 10A-3 judges whether or not it is necessary to change the measurement mode by itself using the past measurement data and current measurement data of its own device, and outputs the measurement data signal. Together, it can be configured to request a change in the current measurement mode of the measurement device. The monitoring device 20A requested to change the measurement mode transmits a response signal for changing the measurement mode to the measurement devices 10A-1 to 10A-3.

In this case, the measurement devices 10A-1 to 10A-3 are configured to change the measurement mode by themselves at the same time that the measurement devices 10A-1 to 10A-3 request the change of the measurement mode, and the monitoring device 20A sends the measurement A response signal confirming the mode change may be transmitted. In this way, the measuring devices 10A-1 to 10A-3 can independently change the measurement mode without waiting for the reception of the response signal from the monitoring device 20A, and respond to sudden changes in water level and the like. It is possible to shorten the measurement interval and acquire the necessary data. As a matter of course, if there is a possibility that the transmission timings of the measurement data signals and the like overlap, the timing may be adjusted using the response signal.

The data to be stored in the data storage unit 23A is not limited to measurement data. Of the data stored in the data storage unit 23, for example, data related to the measuring device 10A-1 is transmitted from the monitoring device 20A to the measuring device 10A-1. , can be stored in the data storage unit 23A. Data associated with the measurement devices 10A-2 and 10A-3 can also be stored in the respective data storage units 23A.

For example, if there is rainfall prediction data (prediction of rainfall amount and start time) that may affect the water level of the measuring device 10A-1, a sudden change in water level is expected from the predicted rainfall amount. , or if there is a possibility that the measurement will be delayed at the set timing (measurement every 30 minutes), although not abruptly, the control unit 11 changes the transmission mode of the measurement data signal of the measurement device 10A-1. preferred to change.

Therefore, the measuring device 10A-1 transmits a measurement mode change request signal together with the measurement data signal, and the monitoring device 20A receives the signal and transmits a response signal confirming the change of the measurement mode.

FIG. 8(a) shows a measurement data signal transmitted from the measuring device 10A-1. It contains the measurement data of the sensor device 30, an identification signal for identifying the measurement device 10A-1 among the plurality of measurement devices, and a measurement mode change request signal for requesting change of the measurement mode. A measurement mode signal including the current transmission/reception interval of the signal described in FIG. 2 may be included.

Upon receiving the measurement data signal from the measuring device 10A-1, the monitoring device 20A transmits a response signal to the measuring device 10A-1. to this response signal. As shown in FIG. 8(b), it includes an identification signal, an acknowledgment signal that the measurement data signal has been received, and a measurement mode change signal. This measurement mode change signal is sent back without judgment (only confirmation) by the control unit 21 when a measurement mode change request signal is sent from the measuring device 10A-1, It can be set as appropriate, such as when determining whether to change the mode and sending a reply.

The change of the measurement mode and the like are the same as those in the above-described embodiment, and detailed description thereof will be omitted.

The information collection system configured as described above can use measurement data to predict future water level changes based on current water level changes. For example, it is possible to predict the time until the dangerous water level is reached, which is useful for calling for early evacuation. In addition, by measuring the water level of the main stream of a river, it is useful for predicting backflow to tributaries (backwater phenomenon) and calling for evacuation. Furthermore, it is also possible to predict the risk of water flow being dammed in the middle of a river by driftwood or the like when the rise in water level that should occur is not measured.

The information collection system of the present invention uses a battery as a power source for the measuring device, and can have a simple configuration. Are suitable. This is also suitable as a prediction device for urban flood damage, which has frequently occurred in recent years.

10, 10A: measuring device, 11: control unit, 12 transmission/reception unit, 13: sensor device, 14: battery, 20, 20A: monitoring device, 21: control unit, 22: transmission/reception unit, 23, 23A: data storage unit, 30: Data collection unit

Claims (4)

A measuring device that transmits the measurement result of the sensor device as a measured data signal at predetermined intervals, and a monitoring device that receives the measured data signals transmitted from the plurality of measuring devices and transmits a response signal to each of the measuring devices. In an information collection system consisting of
The measuring device includes a control unit that switches between an operating state and a non-operating state of the sensor device and the transmitting/receiving unit using a battery as a power supply,
The control unit of the measuring device ,
The sensor device and the transmitting/receiving unit are changed from the non-operating state to the operating state, the measurement result of the sensor device is transmitted to the monitoring device as the measurement data signal, and the operating state is changed to the non-operating state after receiving the response signal from the monitoring device. activating and activating from an inactive state to transmit the next measurement data signal to the monitoring device at predetermined intervals ;
The monitoring device comprises a control unit that analyzes the received measurement data signal and determines whether or not it is necessary to change the measurement mode of the measurement device that transmitted the measurement data signal,
The control unit of the monitoring device,
The transmission and reception of the next measurement data signal and the response signal after receiving the measurement data signal performed between the measurement device that transmitted the measurement data signal and the monitoring device are performed between the other measurement device and the monitoring device. A response signal that controls the timing of transmitting the next measurement data signal from the measuring device so as not to overlap the transmission and reception of the measurement data signal and the response signal after receiving the measurement data signal between and if it is determined that the measurement mode needs to be changed, the measurement mode change signal is included, and if it is determined that the measurement mode need not be changed, the measurement mode change signal is not included. An information collection system characterized by transmitting a response signal including a continuation signal to the measuring device that transmitted the measurement data signal . In the information collection system according to claim 1 ,
The monitoring device includes a data collection unit and a data storage unit that stores data collected by the data collection unit ,
The information collection system, wherein the control unit of the monitoring device analyzes the data stored in the data storage unit in determining whether or not it is necessary to change the measurement mode of the measurement device. In the information collection system according to claim 2 ,
The measuring device includes a data storage unit that stores at least part of the data collected by the data collecting unit provided in the monitoring device ,
The control unit of the measuring device,
analyzing the measurement data and the data stored in the data storage unit of the measurement device to determine whether it is necessary to change the measurement mode;
when determining that the measurement mode needs to be changed, transmitting a measurement mode change request signal together with the measurement data signal to the monitoring device;
The information collection system, wherein the control unit of the monitoring device analyzes the measurement mode change request signal in determining whether or not the measurement mode of the measurement device needs to be changed. In the information collection system according to claim 1 or 2,
The measuring device includes a data storage unit that stores measurement data of the device itself,
The control unit of the measuring device,
analyzing the measurement data and the past measurement data of the own machine stored in the data storage unit of the measurement device, and determining whether or not it is necessary to change the measurement mode;
when determining that the measurement mode needs to be changed, transmitting a measurement mode change request signal together with the measurement data signal to the monitoring device;
The information collection system, wherein the control unit of the monitoring device analyzes the measurement mode change request signal in determining whether or not the measurement mode of the measurement device needs to be changed.

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