JP2024033567A - Flood detection device and flood detection system - Google Patents

Abstract

[Problem] To determine flooding without having to obtain atmospheric pressure from a barometer. A flood detection device includes a receiver and a server. The receiver includes a receiver control device. The receiver control device acquires pressure data indicating the pressure measured by the pressure sensor disposed at a predetermined location, the pressure data indicating the pressure measured by the pressure sensor at predetermined time intervals. The receiver control device determines whether the pressure fluctuation is greater than or equal to a predetermined value. The receiver control device determines that the location where the pressure sensor is located is flooded when the pressure fluctuation is equal to or greater than a predetermined value. [Selection diagram] Figure 4

Description

The present disclosure relates to a flood detection device and a flood detection system.

Flooding may occur due to rising water levels in waterways and rivers. When a water immersion detection device detects water immersion, it is assumed that pressure measured by a pressure sensor is used. The pressure measured by a pressure sensor is affected by variations in atmospheric pressure. As disclosed in Patent Document 1, by determining flooding based on the pressure measured by a pressure sensor and the atmospheric pressure measured by a barometer, the influence of atmospheric pressure fluctuations can be reduced.

Japanese Patent Application Publication No. 2018-124250

When determining flooding based on the pressure measured by the pressure sensor and the atmospheric pressure measured by the barometer, it is necessary to obtain the atmospheric pressure from the barometer.

A water immersion detection device for solving the above problem includes a control device, and the control device collects pressure data indicating pressure measured by a pressure sensor placed at a predetermined location, and the pressure data is measured by the pressure sensor at a predetermined time interval. It is determined whether the fluctuation in the pressure is equal to or greater than a predetermined value, and if the fluctuation in the pressure is equal to or greater than the predetermined value, it is determined that the location is flooded.

The control device determines that the location where the pressure sensor is placed is flooded when the variation in pressure measured by the pressure sensor is equal to or greater than a predetermined value. By determining whether water has flooded from the pressure fluctuations, it is possible to determine whether water has flooded without obtaining atmospheric pressure from a barometer.

Regarding the water immersion detection device, the control device may acquire the pressure data from a plurality of pressure sensors, and determine for each pressure sensor whether the fluctuation in the pressure is equal to or greater than the predetermined value.

Regarding the flood detection device, the control device may provide the user terminal with information indicating the location determined to be flooded.
A flood detection system that solves the above problem includes a transmitter and a flood detection device, and the transmitter includes a pressure sensor placed at a predetermined location, and a pressure measured by the pressure sensor at predetermined time intervals. a transmitter control device that performs an acquisition process for acquiring pressure data indicating the pressure data at a time interval longer than the predetermined time interval, and a transmitter circuit that transmits information indicating the pressure data to the water immersion detection device. , the flood detection device includes a control device, and the control device determines whether the fluctuation in the pressure is greater than or equal to a predetermined value, and if the variation in the pressure is greater than or equal to the predetermined value, the location is flooded. It is determined that there is.

By determining whether water has flooded from the pressure fluctuations, it is possible to determine whether water has flooded without obtaining atmospheric pressure from a barometer.

According to the present invention, water intrusion can be determined without obtaining atmospheric pressure from a barometer.

FIG. 1 is a schematic diagram of a water immersion detection system. FIG. 1 is a schematic configuration diagram of a water immersion detection system. It is a time chart showing the time interval at which the transmitter control device acquires pressure data from the pressure sensor. It is a flowchart which shows the process which a water immersion detection device performs.

Hereinafter, one embodiment of a water immersion detection device and a water immersion detection system will be described.
As shown in FIG. 1, the flood detection system 10 includes a transmitter 11 and a flood detection device 20. The flooding detection device 20 includes a receiver 21 and a server 31.

<Transmitter>
The transmitter 11 may be a dedicated item used only for the water immersion detection system 10, or may also be used as an air pressure sensor for measuring tire air pressure.

The transmitter 11 is placed at a predetermined location. The predetermined location is a location where flooding may occur. The transmitter 11 is provided, for example, near a waterway or a river. The transmitter 11 is attached to a structure. The structure includes a wall ST1, a pile ST2, a utility pole ST3, and a building ST4. In the example shown in FIG. 1, two transmitters 11 are attached to the wall ST1. One transmitter 11 is attached to each of the pile ST2, utility pole ST3, and building ST4. One of the two transmitters 11 attached to the wall ST1 is appropriately designated as a transmitter 11A, and the remaining transmitter 11 is appropriately designated as a transmitter 11B. The transmitter 11 attached to the stake ST2 is appropriately referred to as a transmitter 11C. The transmitter 11A and the transmitter 11B are provided at the same position in the horizontal direction and at different positions in the height direction. The transmitter 11A and the transmitter 11C are provided at the same position in the height direction and at different positions in the horizontal direction.

As shown in FIG. 2, the transmitter 11 includes a pressure sensor 12. The pressure sensor 12 includes a pressure receiving section 12a. The pressure sensor 12 measures the pressure applied to the pressure receiving part 12a. The pressure receiving part 12a is provided so as to be exposed to the outside air. Pressure sensor 12 is part of transmitter 11 and is placed at a predetermined location.

The transmitter 11 includes a transmitter control device 13 . The transmitter control device 13 includes, for example, a processor 14 and a storage section 15. Examples of the processor 14 include an MPU (Micro Processing Unit), a CPU (Central Processing Unit), and a DSP (Digital Signal Processor). The storage unit 15 includes a RAM (Random Access Memory) and a ROM (Read Only Memory). The storage unit 15 stores program codes or instructions configured to cause the processor 14 to execute processes. Storage 15, or computer readable media, includes any available media that can be accessed by a general purpose or special purpose computer. The transmitter control device 13 may be configured by a hardware circuit such as an ASIC (Application Specific Integrated Circuit) or an FPGA (Field Programmable Gate Array). The transmitter control device 13, which is a processing circuit, may include one or more processors that operate according to a computer program, one or more hardware circuits such as ASIC or FPGA, or a combination thereof. The storage unit 15 stores an ID code indicating unique identification information of the transmitter 11.

The transmitter 11 includes a transmitting circuit 16. The transmitting circuit 16 performs modulation according to the frame input from the transmitter control device 13. A frame consists of data in a format specified by the protocol. The frame includes pressure data and an ID code. The pressure data is the measurement result of the pressure sensor 12.

The transmitter 11 includes a transmitting antenna 17 . The transmitting circuit 16 transmits the modulated radio signal from the transmitting antenna 17. This wireless signal is a signal including information indicating pressure data and information indicating an ID code.

As shown in FIG. 3, the transmitter control device 13 performs the acquisition process at the first time interval T1. The acquisition process is a process of acquiring pressure data indicating the pressure measured by the pressure sensor 12 from the pressure sensor 12 multiple times. In the acquisition process, the transmitter control device 13 acquires pressure data from the pressure sensor 12 at the second time interval T2. The number of times pressure data is acquired in the acquisition process can be arbitrarily set within the range of 6 to 10 times, for example. The first time interval T1 is longer than the second time interval T2. The second time interval T2 is a predetermined time interval. The first time interval T1 can be arbitrarily set within the range of 60 [sec] to 150 [sec], for example. The second time interval T2 can be arbitrarily set within the range of 100 to 200 [msec], for example. The transmitter control device 13 transmits a wireless signal from the transmitter circuit 16 every time pressure data is acquired from the pressure sensor 12.

<Receiver>
As shown in FIG. 1, the receiver 21 is attached to a structure. The receiver 21 is provided at a position where it can receive the wireless signal from the transmitter 11. The receiver 21 can receive wireless signals transmitted from the plurality of transmitters 11. The number of receivers 21 is smaller than the number of transmitters 11.

As shown in FIG. 2, the receiver 21 includes a receiver control device 22. As shown in FIG. The hardware configuration of the receiver control device 22 is, for example, the same as that of the transmitter control device 13. The receiver control device 22 includes, for example, a processor 23 and a storage unit 24.

The receiver 21 includes a receiving circuit 25 . The receiving circuit 25 demodulates the radio signal transmitted from the transmitter 11 to obtain data included in the frame. The receiving circuit 25 outputs data to the receiver control device 22. Thereby, the receiver control device 22 acquires the pressure data that is the measurement result of the pressure sensor 12 and the ID code of the transmitter 11 that transmitted the wireless signal.

The receiver 21 includes a receiving antenna 26 . The receiving antenna 26 receives the radio signal transmitted from the transmitter 11. The radio signal received by the receiving antenna 26 is input to the receiving circuit 25.

The receiver 21 includes a communication device 27 . The communication device 27 is a network device that includes a communication control unit, a port, etc., and is capable of transmitting and receiving information through the communication network NW. The communication device 27 is connected to the server 31 via the communication network NW.

<Server>
The server 31 includes a server control device 32 . The hardware configuration of the server control device 32 is, for example, the same as that of the transmitter control device 13. The server control device 32 includes, for example, a processor 33 and a storage unit 34.

The storage unit 34 stores a correspondence relationship between the ID code of the transmitter 11 and the position of the transmitter 11. The position of the transmitter 11 is a position in an absolute coordinate system. The position of the transmitter 11 is, for example, latitude and longitude.

The server 31 includes a communication device 35. The communication device 35 is, for example, similar to the communication device 27. The communication device 35 is connected to the receiver 21 via the communication network NW. Thereby, the server 31 and the receiver 21 can exchange information with each other.

The server 31 can provide information to the user terminal 40. For example, the server 31 provides information to the user terminal 40 via the communication network NW. The user terminal 40 is, for example, a smartphone, a tablet terminal, or a personal computer.

<Control performed by flood detection device>
The control performed by the water immersion detection device 20 will be explained. The following control is repeatedly performed at a predetermined control cycle.

As shown in FIG. 4, in step S1, the receiver control device 22 acquires pressure data. Specifically, when the receiving antenna 26 receives a wireless signal from the transmitter 11, the receiving circuit 25 demodulates the wireless signal, and the receiver control device 22 acquires pressure data. In step S1, the receiver control device 22 acquires pressure data acquired multiple times at the second time interval T2 by the acquisition process. The receiver control device 22 acquires pressure data every time the receiver 21 receives a wireless signal from a plurality of transmitters 11 that can receive wireless signals. Therefore, the receiver control device 22 acquires pressure data from the plurality of pressure sensors 12.

Next, in step S2, the receiver control device 22 determines whether the fluctuation in pressure is greater than or equal to a predetermined value based on the pressure indicated by the pressure data acquired multiple times in step S1. It can be said that the receiver control device 22 determines whether or not the pressure measured by the pressure sensor 12 fluctuates by a predetermined value or more while the acquisition process is being performed. Whether or not the pressure fluctuation is equal to or greater than a predetermined value can be determined using various methods. The receiver control device 22 may determine that the pressure fluctuation is greater than or equal to a predetermined value when the difference between the highest pressure value and the lowest pressure value is greater than or equal to a predetermined value. The receiver control device 22 may calculate the standard deviation of pressure, and if the standard deviation is greater than or equal to a predetermined value, may determine that the pressure fluctuation is greater than or equal to the predetermined value. The receiver control device 22 calculates the difference from the previous value for each of the pressures measured multiple times, and determines that the pressure fluctuation is more than the predetermined value when the difference from the previous value is more than a predetermined value. It's okay. The predetermined value is set, for example, so that the determination result in step S2 does not become affirmative due to pressure fluctuations due to atmospheric pressure fluctuations. The process in step S2 is performed individually for each ID code. Thereby, the receiver control device 22 determines for each pressure sensor 12 whether or not the pressure fluctuation is equal to or greater than a predetermined value. If the determination result in step S2 is affirmative, the receiver control device 22 performs the process in step S3. If the determination result in step S2 is negative, the receiver control device 22 performs the process in step S4.

In step S3, the receiver control device 22 determines that the location where the pressure sensor 12 whose pressure has fluctuated by a predetermined value or more is located is flooded. After completing the process in step S3, the receiver control device 22 performs the process in step S5.

In step S4, the receiver control device 22 determines that the location where the pressure sensor 12 whose pressure has fluctuated by a predetermined value or more is located is not flooded. After completing the process in step S4, the receiver control device 22 performs the process in step S5.

In step S5, the receiver control device 22 transmits to the server 31 data in which the ID code is associated with the determination result as to whether or not the receiver is submerged in water.
Next, in step S6, the server control device 32 provides the user terminal 40 with information indicating the location where the receiver control device 22 has determined that it is flooded. The server control device 32 can recognize the ID code of the transmitter 11 placed in the flooded place from the determination result sent in step S5. The server control device 32 uses the correspondence stored in the storage unit 34 to recognize the flooded location. At this time, the server control device 32 may determine that a predetermined range based on the location where the transmitter 11 that has been determined to be flooded is flooded.

The server control device 32 provides the user terminal 40 with information indicating a flooded location using at least one of a web browser and an application. Information indicating the location of flooding may be provided in text or image form. When providing information indicating a flooded place in text, the name of the flooded place may be displayed on the user terminal 40. When providing information indicating a flooded place in the form of an image, an image depicting the flooded area in a map image may be displayed on the user terminal 40. In this embodiment, the receiver control device 22 and the server control device 32 are control devices.

[Operation of this embodiment]
As shown in FIG. 1, when the place where the transmitter 11 is located is flooded, pressure from the water F is applied to the pressure receiving part 12a of the pressure sensor 12. When the pressure sensor 12 acquires pressure data multiple times due to the pressure from the water F applied to the pressure receiving part 12a of the pressure sensor 12, the fluctuation in pressure becomes equal to or greater than a predetermined value.

[Effects of this embodiment]
(1) The receiver control device 22 determines that the location where the pressure sensor 12 is placed is flooded when the fluctuation in the pressure measured by the pressure sensor 12 is equal to or greater than a predetermined value. By determining water intrusion based on pressure fluctuations, water intrusion can be determined without acquiring atmospheric pressure from a barometer. The water immersion detection system 10 does not need to include a barometer, and manufacturing costs can be reduced.

(2) The receiver control device 22 determines whether the location where the pressure sensor 12 is located is submerged in water. The amount of data transmitted from the receiver 21 to the server 31 can be reduced compared to when the server control device 32 determines whether or not the location where the pressure sensor 12 is located is flooded.

(3) The server control device 32 provides the user terminal 40 with information indicating the flooded location. This allows the user to be notified of the location that is flooded.
(4) When radio waves transmitted from the transmitter 11 are received by the receiver 21 and flooding is determined based on the intensity of the radio waves, the intensity of the radio waves changes depending on the distance between the transmitter 11 and the receiver 21. Therefore, when determining flooding based on the intensity of radio waves transmitted from the transmitter 11, it is necessary to change settings depending on the distance between the transmitter 11 and the receiver 21. On the other hand, by determining water intrusion using the pressure measured by the pressure sensor 12, there is no need to change the settings depending on the distance between the transmitter 11 and the receiver 21.

(5) When determining water intrusion using two contacts, the determination accuracy may decrease due to dirt on the contacts. On the other hand, when determining water intrusion using the pressure sensor 12, it is less susceptible to dirt than when using two contacts.

(6) The transmitter control device 13 performs the acquisition process at the first time interval T1. Since the first time interval T1 is longer than the second time interval T2, power consumption can be reduced compared to a case where the acquisition process is continuously performed.

[Example of change]
The embodiment can be modified and implemented as follows. The embodiments and the following modification examples can be implemented in combination with each other within a technically consistent range.

- The receiver control device 22 may obtain information regarding flooding by comparing the determination results as to whether or not the location where the pressure sensor 12 is located is flooded. For example, when the receiver control device 22 determines that the transmitter 11A is submerged in water and determines that the transmitter 11B is not submerged in water, the receiver control device 22 determines that the water level is between the transmitters 11A and 11B. It may be determined that there is. If the receiver control device 22 determines that the transmitter 11A is submerged in water and determines that the transmitter 11C is not submerged in water, the receiver control device 22 determines that the range between the transmitters 11A and 11C is submerged in water. It may be determined that the The above processing may be performed by the server control device 32.

- The transmitter control device 13 may determine whether the location where the pressure sensor 12 is located is submerged in water. In this case, the transmitter control device 13 may transmit data in which the ID code is associated with the determination result as to whether or not the vehicle is submerged in water. This data may be transmitted to the receiver 21 or may be transmitted to the server 31 via the communication network NW. In this case, the transmitter control device 13 is a control device and a water immersion detection device. Furthermore, when the transmitter control device 13 determines that the location where the pressure sensor 12 is located is flooded, it may issue a notification using an alarm. The notification device provides notification by, for example, sound or display.

- The server control device 32 may determine whether or not the location where the pressure sensor 12 is located is flooded. In this case, the receiver control device 22 may transmit data in which the ID code is associated with the pressure data acquired from the transmitter 11 to the server 31. Further, when the transmitter 11 can transmit data to the server 31 via the communication network NW, data in which pressure data is associated with an ID code may be transmitted from the transmitter 11 to the server 31. In this case, the server control device 32 is a control device and a water immersion detection device.

- The receiver control device 22 may provide the user terminal 40 with information indicating a location that is flooded. In this case, the receiver control device 22 is a control device and a water immersion detection device.
- The transmitter control device 13 may continue to perform the acquisition process. In this case, the receiver control device 22 may determine whether or not the location where the pressure sensor 12 is located is submerged in water using the pressure data of the most recent predetermined number of times. The predetermined number of times is, for example, the same as the number of times pressure data is acquired in the acquisition process.

DESCRIPTION OF SYMBOLS 10... Flood detection system, 11... Transmitter, 12... Pressure sensor, 13... Control device for transmitter, 20... Flooding detection device, 22... Control device for receiver which is a control device, 32... For server which is a control device Control device, 40...user terminal.

Claims (4)

Equipped with a control device,
The control device includes:
Obtaining pressure data indicating the pressure measured by a pressure sensor placed at a predetermined location, the pressure data indicating the pressure measured by the pressure sensor at a predetermined time interval,
Determining whether the fluctuation in the pressure is greater than or equal to a predetermined value,
A water immersion detection device that determines that the location is flooded when the pressure variation is equal to or greater than the predetermined value. The control device includes:
acquiring the pressure data from a plurality of the pressure sensors;
The water immersion detection device according to claim 1, wherein it is determined for each of the pressure sensors whether the fluctuation in the pressure is equal to or greater than the predetermined value. The flood detection device according to claim 1 or 2, wherein the control device provides information indicating the location determined to be flooded to a user terminal. a transmitter and
Equipped with a water immersion detection device,
The transmitter is
a pressure sensor placed at a predetermined location;
a transmitter control device that performs an acquisition process of acquiring pressure data indicating the pressure measured by the pressure sensor at a predetermined time interval at a time interval longer than the predetermined time interval;
a transmitting circuit that transmits information indicating the pressure data to the water immersion detection device,
The flood detection device includes a control device,
The control device includes:
Determining whether the fluctuation in the pressure is greater than or equal to a predetermined value,
A flood detection system that determines that the location is flooded when the variation in pressure is equal to or greater than the predetermined value.

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