JP6325147B1 - Threshold setting method, water leakage monitoring device and program - Google Patents

Abstract

A threshold setting method, a water leakage monitoring device, and a program capable of setting an appropriate threshold value for determining the presence or absence of water leakage are provided. A water leakage monitoring apparatus 1 capable of setting a threshold value for determining the presence or absence of water leakage, and whether or not the vibration level of acoustic vibration transmitted through a water pipe exceeds a temporary threshold value that is a temporarily set threshold value. Temporary water leakage determination unit 120 that repeats the temporary water leakage determination for determining the presence or absence of water leakage according to a plurality of times while changing the temporary threshold value, and a threshold setting unit that sets the threshold based on the determination result of temporary water leakage determination unit 120 130. [Selection] Figure 2

Description

  The present invention relates to a threshold setting method for setting a threshold for determining the presence or absence of water leakage, a water leakage monitoring device, and a program.

  Conventionally, patent document 1 is known as this kind of technique. In Patent Document 1, the number of occurrences of a sound break detection signal that occurs when the vibration level of acoustic vibration transmitted through a water pipe falls below a predetermined threshold is measured. Is disclosed. When there is water leakage, it is generally considered that acoustic vibration continues. In Patent Document 1, paying attention to this point, the presence or absence of water leakage is easily determined by measuring the number of occurrences of the sound interruption detection signal.

Japanese Patent No. 3263044

  By the way, when the water leakage is determined based on the acoustic vibration transmitted through the water pipe as in Patent Document 1, it is important to set a threshold value as a vibration level determination criterion. For example, when a water leakage monitoring device is installed in a place where environmental noise is constantly generated (motor sound of a septic tank, water flow water noise, motor sound of equipment installed on a road such as a vending machine, etc.), Patent Document 1 When this technique is applied, the number of occurrences of the sound interruption detection signal is reduced due to the continued acoustic vibration, so that there is a risk of erroneous determination that there is water leakage. For this reason, it is desirable to raise the threshold value and lower the detection sensitivity of sound interruptions in places where environmental noise occurs. On the contrary, in a place where environmental noise does not occur, it is desirable to determine the presence or absence of water leakage earlier by lowering the threshold and increasing the detection sensitivity of sound interruption. Conventionally, however, it has been difficult to set an appropriate value as a threshold value used as a criterion for determining a vibration level because “people” depend on their skill and intuition.

  In view of the above-described problems, an object of the present invention is to provide a threshold setting method, a water leakage monitoring device, and a program that can set a threshold for determining the presence or absence of water leakage to an appropriate value.

The threshold value setting method of the present invention is a threshold value setting method for setting a threshold value for determining the presence or absence of water leakage, and the computer is a temporary threshold value in which the vibration level of the acoustic vibration transmitted through the water pipe is a temporarily set threshold value. The temporary water leakage determination for determining the presence or absence of water leakage is repeated n times while changing the temporary threshold (where n is an integer satisfying n ≧ 3). The water leakage determination is based on the temporary water leakage determination step for determining the presence or absence of water leakage according to whether or not the temporary threshold value changed based on the determination result of the previous temporary water leakage determination is exceeded, and the determination result of the nth temporary water leakage determination. Based on the threshold setting step of setting the threshold, the first temporary threshold used in the first temporary water leakage determination is the maximum value or the minimum value of the temporary threshold, and the second temporary water leakage determination is performed. The second temporary threshold used in is the first temporary threshold If is the maximum value of the temporary threshold, the minimum value of the tentative threshold, the first tentative threshold if the minimum value of the tentative threshold, characterized in that it is a maximum value of the temporary threshold.
The threshold value setting method of the present invention is a threshold value setting method for setting a threshold value for determining the presence or absence of water leakage, and the computer is a temporary threshold value in which the vibration level of the acoustic vibration transmitted through the water pipe is a temporarily set threshold value. Based on the determination result of the temporary water leakage determination step and the temporary water leakage determination step that repeats the temporary water leakage determination that determines the presence or absence of water leakage depending on whether or not it exceeds a predetermined number of times while changing the temporary threshold. A threshold setting step and a start instruction acquisition step for acquiring a start instruction for temporary water leakage determination are executed, and the temporary water leakage determination step starts the temporary water leakage determination after a predetermined time has elapsed since the start instruction was acquired. Features.
In the above threshold value setting method, the temporary water leakage determination step is characterized in that the temporary water leakage determination is repeated a plurality of times while changing the temporary threshold value so that the absolute value of the change amount of the temporary threshold value gradually decreases.
In the above threshold value setting method, the temporary water leakage determination step is characterized in that the temporary water leakage determination is repeated a plurality of times while changing the temporary threshold value so that the absolute value of the change amount of the temporary threshold value is decreased by 1/2.
In the above threshold setting method, the threshold setting step sets a threshold candidate based on the determination result of the temporary water leakage determination step, and based on a plurality of threshold candidates obtained by repeating the temporary water leakage determination step a plurality of times, This is characterized in that the threshold value is set.
The water leakage monitoring device of the present invention is a water leakage monitoring device capable of setting a threshold for determining the presence or absence of water leakage, and the vibration level of the acoustic vibration transmitted through the water pipe exceeds a temporary threshold that is a temporarily set threshold. The temporary water leakage determination for determining the presence or absence of water leakage depending on whether or not is repeated n times while changing the temporary threshold (where n is an integer satisfying n ≧ 3), and the third and subsequent temporary water leakage determinations Is based on a determination result of a temporary water leakage determination unit for determining the presence or absence of water leakage according to whether or not the temporary threshold value changed based on a determination result of the previous temporary water leakage determination is exceeded, and a determination result of the nth temporary water leakage determination The first temporary threshold value used in the first temporary water leakage determination is a maximum value or a minimum value of the temporary threshold value, and is used in the second temporary water leakage determination. The second temporary threshold value is a temporary threshold value when the first temporary threshold value is the maximum value of the temporary threshold value. The minimum value of the first tentative threshold if the minimum value of the tentative threshold, characterized in that it is a maximum value of the temporary threshold.
The water leakage monitoring device of the present invention is a water leakage monitoring device capable of setting a threshold for determining the presence or absence of water leakage, and the vibration level of the acoustic vibration transmitted through the water pipe exceeds a temporary threshold that is a temporarily set threshold. Threshold setting for permanently setting the threshold based on the determination result of the temporary leakage determination unit and the temporary leakage determination unit that repeats the temporary leakage determination multiple times while changing the temporary threshold. And a start instruction acquisition unit that acquires a start instruction for temporary water leakage determination, the temporary water leakage determination unit starts temporary water leakage determination after a predetermined time has elapsed after acquiring the start instruction. .
A program according to the present invention causes a computer to execute each step in the threshold value setting method.
In addition, it is good also as the following structures.
The threshold value setting method of the present invention is a threshold value setting method for setting a threshold value for determining the presence or absence of water leakage, and the computer is a temporary threshold value in which the vibration level of the acoustic vibration transmitted through the water pipe is a temporarily set threshold value. Based on the determination result of the temporary water leakage determination step and the temporary water leakage determination step that repeats the temporary water leakage determination that determines the presence or absence of water leakage depending on whether or not it exceeds a predetermined number of times while changing the temporary threshold. And a threshold setting step.

  The water leakage monitoring device of the present invention is a water leakage monitoring device capable of setting a threshold for determining the presence or absence of water leakage, and the vibration level of the acoustic vibration transmitted through the water pipe exceeds a temporary threshold that is a temporarily set threshold. Threshold setting for permanently setting the threshold based on the determination result of the temporary leakage determination unit and the temporary leakage determination unit that repeats the temporary leakage determination multiple times while changing the temporary threshold. And a section.

  A program according to the present invention causes a computer to execute each step in the threshold value setting method.

  According to the configuration of the present invention, the temporary leakage determination for determining the presence or absence of water leakage depending on whether or not the temporary threshold is exceeded is repeated a plurality of times while changing the temporary threshold. Can be set to Moreover, since the operation for setting the threshold value is unnecessary, the work load of the installer who installs the water leakage monitoring device can be reduced.

  In the above threshold value setting method, the temporary water leakage determination step is characterized in that the temporary water leakage determination is repeated a plurality of times while changing the temporary threshold value so that the absolute value of the change amount of the temporary threshold value gradually decreases.

  According to the configuration of the present invention, since the temporary threshold value is changed so that the absolute value of the change amount of the temporary threshold value gradually decreases, the temporary water leakage determination can be performed efficiently, and the threshold value is set quickly. Can do.

  In the above threshold value setting method, the temporary water leakage determination step is characterized in that the temporary water leakage determination is repeated a plurality of times while changing the temporary threshold value so that the absolute value of the change amount of the temporary threshold value is decreased by 1/2.

  According to the configuration of the present invention, since the temporary threshold value is set by applying the binary search algorithm, the threshold value can be set more rapidly.

  In the above threshold value setting method, the temporary water leakage determination step repeats the temporary water leakage determination n times (where n is an integer satisfying n ≧ 3), and the third and subsequent temporary water leakage determinations are the determinations of the previous temporary water leakage determination. The presence or absence of water leakage is determined according to whether or not the temporary threshold value changed based on the result is exceeded, and the threshold value setting step sets the threshold value based on the determination result of the nth temporary water leakage determination. And

  According to the configuration of the present invention, since the temporary water leakage determination is repeated using the temporary threshold changed based on the previous determination result, the threshold for this setting can be set to a more appropriate value.

  In the above threshold setting method, the first temporary threshold used in the first temporary water leakage determination is the maximum value or the minimum value of the temporary threshold, and the second temporary threshold used in the second temporary water leakage determination is When the first temporary threshold is the maximum value of the temporary threshold, it is the minimum value of the temporary threshold, and when the first temporary threshold is the minimum value of the temporary threshold, it is the maximum value of the temporary threshold.

  According to the configuration of the present invention, when the first provisional threshold or the second provisional threshold is set to the maximum value of the provisional threshold (when the leakage detection sensitivity is lowered), it is determined that “there is water leakage” (vibration level). ) Exceeds the provisional threshold value), it is inappropriate as an installation location of the water leakage monitoring device, so that it can be determined as an error. Further, when the first temporary threshold or the second temporary threshold is the maximum value of the temporary threshold, and the first temporary threshold or the second temporary threshold is the minimum value of the temporary threshold (water leakage) When it is determined that there is no water leakage (when the detection sensitivity is increased) (when the vibration level is equal to or lower than the temporary threshold value), the threshold value of this setting can be set to the minimum value of the temporary threshold value. In this way, by setting the first temporary threshold value and the second temporary threshold value so as to have a relationship between the maximum value and the minimum value of the temporary threshold value or the minimum value and the maximum value, the number of repetitions of the temporary water leakage determination is reduced. Therefore, the threshold value can be set more quickly.

  In the above threshold value setting method, a start instruction acquisition step for acquiring a start instruction for temporary water leak determination is executed, and the temporary water leak determination step is to start the temporary water leak determination after a predetermined time has elapsed since the start instruction was acquired. Features.

  According to the configuration of the present invention, the temporary water leakage determination can be started after the installer of the water leakage monitoring device leaves the installation location of the water leakage monitoring device. Thereby, after installing the water leakage monitoring apparatus, it is possible to prevent the threshold value reflecting the vibration of closing the manhole cover or walking by the installer from being erroneously set.

  In the above threshold setting method, the threshold setting step sets a threshold candidate based on the determination result of the temporary water leakage determination step, and based on a plurality of threshold candidates obtained by repeating the temporary water leakage determination step a plurality of times, This is characterized in that the threshold value is set.

  According to the configuration of the present invention, the temporary water leakage determination step may not be set to an appropriate value, for example, when temporary vibration is detected only by executing the temporary water leakage determination step once. By repeating the steps a plurality of times, a highly reliable threshold value can be expected.

It is a figure which shows the circuit structure of the water leak monitoring apparatus which concerns on one Embodiment of this invention. It is a figure which shows the function structure of a water leak monitoring apparatus. It is a figure which shows the example of a setting of the temporary threshold value in a temporary water leak determination, and the threshold value for this setting. It is a flowchart which shows the flow of a threshold value setting process. 10 is a flowchart showing a flow of threshold setting processing according to Modification 1.

  Hereinafter, a threshold setting method, a water leakage monitoring device, and a program according to the present invention will be described with reference to the accompanying drawings. FIG. 1 is a diagram illustrating a circuit configuration of a water leakage monitoring apparatus 1 according to an embodiment of the present invention. The water leakage monitoring device 1 is an example of a “computer”.

  The water leakage monitoring device 1 monitors the presence or absence of water leakage in a water pipe, and is installed around a water meter. The water pipe to be monitored is not particularly limited, and may be, for example, a water pipe, a water supply pipe, or a drain pipe. Moreover, the installation location of the water leakage monitoring device 1 is not limited to around the water meter, but may be set to a gate valve, an air valve, a fire hydrant, or the like on the water pipe.

  As shown in FIG. 1, the water leakage monitoring apparatus 1 includes a digital circuit unit 20 that operates constantly and an analog circuit unit 10 that operates intermittently under the control of the digital circuit unit 20. In addition, the water leakage monitoring device 1 displays a vibration sensor S that detects acoustic vibration transmitted through the water pipe, an operation panel 30 on which the installer who installs the water leakage monitoring device 1 performs various operations, and various information such as the presence or absence of water leakage. An LCD (liquid crystal display) 40, a power source 50 that supplies power to the water leakage monitoring device 1, and a switch 60 that switches whether or not power is supplied to the analog circuit unit 10 are provided.

  The analog circuit unit 10 and the digital circuit unit 20 may each be configured by a one-chip IC, or both circuit elements may be incorporated in a one-chip IC. Alternatively, some of the circuit elements of the analog circuit unit 10 and the digital circuit unit 20 may be individual ICs, and each may be composed of a plurality of ICs.

  The analog circuit unit 10 is a circuit that processes an electrical signal output from the vibration sensor S, and includes an amplifier 11, a frequency filter 12, a rectifier circuit 13, and a voltage comparator 14. The vibration sensor S detects acoustic vibration transmitted through the water pipe and converts it into an electrical signal (acoustic signal). The amplifier 11 amplifies the acoustic signal output from the vibration sensor S. The frequency filter 12 cuts a signal in a predetermined frequency band (frequency band considered to be unnecessary for discrimination of water passing sound such as a high frequency band) in the amplified signal. The rectifier circuit 13 detects the envelope of the acoustic signal that has passed through the frequency filter 12.

  The voltage comparator 14 compares the detection output Vs output from the rectifier circuit 13 with the reference voltage value Vr. When Vs> Vr, a high level (H) signal Vout is output, and when Vs ≦ Vr, a low level (L) signal Vout is output. Note that an additional circuit in which a predetermined time constant is set may be added to the analog circuit unit 10 in order to ignore instantaneous changes in the acoustic signal (such as instantaneous vibration generation or stop).

  On the other hand, the digital circuit unit 20 includes an AND circuit 21, a timer 22, a clock generation circuit 23, a counter 24, and a controller 25. The AND circuit 21 receives the Vout output from the analog circuit unit 10 and the control signal Vc output from the controller 25. The timer 22 measures time by counting the clock pulses generated by the clock generation circuit 23. The register of the timer 22 stores the number of clock pulses for about 2 seconds, and there is no acoustic vibration (with Vout “L” being input to the AND circuit 21) for about 2 seconds. When the number of clock pulses is measured, the counter 24 is incremented.

  The controller 25 controls the analog circuit unit 10 according to the measurement result of the clock pulse by the timer 22 and the measurement schedule according to the operation mode. The water leakage monitoring apparatus 1 according to the present embodiment performs water leakage monitoring based on the threshold set in the “threshold setting mode” and the “threshold setting mode” for setting a threshold for determining the presence or absence of water leakage as the operation mode. “Normal monitoring mode”. Here, the “threshold value” corresponds to the reference voltage value Vr, and the value is changed by the controller 25. A reference voltage generation circuit 15 for generating a reference voltage to be input to the voltage comparator 14 is incorporated in the analog circuit unit 10 of the water leakage monitoring device 1, and the reference voltage generation circuit 15 is output from the controller 25. Based on the control signal, the reference voltage input to the voltage comparator 14 is varied.

  The measurement schedule of the “threshold setting mode” is about 3 minutes after the setting of the “threshold setting mode”, and about 3 minutes after the temporary water leak determination for determining the presence or absence of water leak by operating the analog circuit unit 10 for about 2 seconds. And is repeated a plurality of times (in this embodiment, 6 times). The controller 25 sets a threshold value used in the “normal monitoring mode” by repeating this temporary water leakage determination a plurality of times. In the following description, a series of processing in the “threshold setting mode” is referred to as “threshold setting processing”. The threshold setting process is executed when the water leakage monitoring apparatus 1 is installed.

  On the other hand, the measurement schedule in the “normal monitoring mode” is set to the measurement time from 2 am to 5 am, which is considered to have little normal running water and environmental vibration, and the analog circuit unit 10 is operated for about 2 seconds to check whether there is water leakage. This water leak determination to be determined is repeated a plurality of times (in this embodiment, 60 times) at intervals of about 3 minutes. The controller 25 sets the measurement for 3 hours as one monitoring cycle, and performs water leakage monitoring at the same time every day.

  Note that the controller 25 sets the operation mode to the “threshold setting mode” and executes threshold setting processing when the operation panel 30 performs a temporary water leakage determination start instruction operation. Further, the controller 25 switches the operation mode to the “normal monitoring mode” after the threshold setting process is completed. It is also possible to operate the water leakage monitoring apparatus 1 directly in the “normal monitoring mode” without performing the threshold setting process. In this case, in the “normal monitoring mode”, the water leakage determination may be performed using a threshold value manually input from the operation panel 30, or the water leakage determination may be performed using a default threshold value.

  The controller 25 controls the switch 60 to cause the analog circuit unit 10 to operate intermittently. For example, in the “normal monitoring mode”, the operation of closing the switch 60 for about 2 seconds and then opening the switch 60 for about 2 minutes 58 seconds is repeated. Further, the controller 25 sets the control signal Vc to the H level (H) while the switch 60 is closed.

  Here, the operation of the digital circuit unit 20 in the “normal monitoring mode” will be described. The AND circuit 21 receives the inverted signal of Vout output from the analog circuit unit 10 and the control signal Vc output from the controller 25, and outputs a reset signal Vres. Here, when Vout is “L” and Vc is “H”, the reset signal Vres becomes “H” and the timer 22 counts clock pulses. The timer 22 increments the counter 24 when counting the number of clock pulses for a predetermined time (in this embodiment, about 2 seconds). When Vout is “H” and Vc is “H”, the reset signal Vres becomes “L” and the timer 22 resets the time measurement.

  That is, in the “normal monitoring mode”, the state where the vibration transmitted to the water pipe is below a predetermined threshold is maintained during the operation time of about 2 seconds of the analog circuit unit 10 (detection output Vs ≦ reference voltage value Vr is maintained). Timer 22 outputs a no-vibration signal (pulse), and counter 24 is incremented. On the other hand, if the vibration transmitted to the water pipe exceeds a predetermined threshold during the operation time of about 2 seconds of the analog circuit unit 10 (when the detection output Vs> the reference voltage value Vr), the time measurement of the timer 22 is reset. Is done.

  The count value accumulated in the counter 24 can be displayed on the LCD 40 by a display instruction operation using the operation panel 30. For example, it is conceivable that an inspector performs an inspection every predetermined period, such as once a month, and the operation panel 30 is operated to display a count value on the LCD 40 for confirmation. At this time, if the count value is small, it means that the acoustic vibration transmitted through the water pipe is not interrupted. Therefore, it can be determined that “there is water leakage (the possibility of water leakage is high)”. The inspector operates the operation panel 30 after confirming the LCD 40 to reset the count value of the counter 24. In addition, the operation panel 30 is also used for changing the measurement schedule in the “threshold setting mode” and the “normal monitoring mode”, setting the current date and time, and the like.

  Next, the operation of the digital circuit unit 20 in the “threshold setting mode” will be described. In the “threshold setting mode”, when Vout is “L” and Vc is “H”, the timer 22 counts clock pulses when the reset signal Vres becomes “H”. When the timer 22 counts the number of clock pulses for a predetermined time (in this embodiment, about 2 seconds) (when the detection output Vs ≦ the reference voltage value Vr is maintained for about 2 seconds), the timer 25 Outputs no vibration signal (pulse). When the number of clock pulses for a predetermined time is not counted (when the detection output Vs ≦ the reference voltage value Vr is not maintained for about 2 seconds), a signal with vibration (pulse) is output to the controller 25. The controller 25 determines “no water leakage” when a vibration-free signal is input, and determines “water leakage” when a vibration-present signal is input. The threshold setting process in the “threshold setting mode” will be described in detail later.

  Next, the functional configuration of the water leakage monitoring apparatus 1 will be described with reference to FIG. The water leakage monitoring device 1 includes a start instruction acquisition unit 110, a temporary water leakage determination unit 120, a threshold setting unit 130, a main water leakage determination unit 140, and a determination result display control unit 150 as functional configurations. These are functions realized by the controller 25 executing a program (not shown). Of these, the temporary water leakage determination unit 120 and the threshold setting unit 130 are functions realized in the “threshold setting mode”. Further, the main water leakage determination unit 140 and the determination result display control unit 150 are functions realized in the “normal monitoring mode”.

  The start instruction acquisition unit 110 acquires a start instruction for temporary water leakage determination (start instruction acquisition step). Upon acquiring this instruction, the water leakage monitoring apparatus 1 is set to the “threshold setting mode” and starts the threshold setting process. The threshold setting process includes the processes of the temporary water leakage determination unit 120 and the threshold setting unit 130.

  The temporary water leakage determination unit 120 starts the temporary water leakage determination after a predetermined time has elapsed after acquiring the temporary water leakage determination start instruction (in this embodiment, after about 3 minutes). In the temporary water leakage determination, the presence or absence of water leakage is determined depending on whether or not the vibration level of the acoustic vibration transmitted through the water pipe exceeds a temporary threshold that is a temporarily set threshold. The temporary water leakage determination unit 120 repeats this temporary water leakage determination a plurality of times while changing the temporary threshold value. That is, the control of the digital circuit unit 20 determines whether or not the detection output Vs ≦ the reference voltage value Vr is maintained during the operation time of about 2 seconds of the analog circuit unit 10 while changing the reference voltage value Vr. If not, it is determined that there is no water leak, and if it is not maintained, it is determined that there is water leak (temporary water leak determination step).

In the present embodiment, the temporary water leakage determination is repeated while changing the temporary threshold value so that the absolute value of the change amount of the temporary threshold value decreases by 1/2. That is, the temporary threshold in each temporary water leak determination is set by applying the binary search algorithm. In the present embodiment, the temporary water leakage determination is repeated 6 times (n times) (n is an integer satisfying n ≧ 3), and the first temporary threshold value used in the first temporary water leakage determination is set to the maximum temporary threshold value. The second temporary threshold value used in the second temporary water leakage determination is set as the minimum value of the temporary threshold value. In the present embodiment, the temporary threshold is set within the range of the minimum value “10” to the maximum value “90”. This value is obtained by replacing the detection sensitivity for detecting the vibration level of the acoustic vibration with a numerical value, and the temporary threshold minimum value “10” corresponds to the maximum sensitivity. Further, the maximum value “90” of the temporary threshold corresponds to the minimum sensitivity. Moreover, the temporary water leakage determination after the 3rd time uses the temporary threshold value changed based on the determination result of the previous temporary water leakage determination. Specifically, when it is determined that “there is water leakage”, a value obtained by adding “80/2 ⁿ⁻² ” to the temporary threshold value used in the previous temporary water leakage determination is set as the n-th temporary threshold value. When it is determined that “no water leak”, the value obtained by subtracting “80/2 ⁿ⁻² ” from the temporary threshold value used in the previous temporary water leakage determination is set as the n-th temporary threshold value.

  The threshold setting unit 130 performs the actual setting of the threshold based on the determination result of the temporary water leakage determination unit 120 (threshold setting step). In the present embodiment, the threshold value is permanently set based on the determination result of the sixth (n-th) temporary water leakage determination. Specifically, when it is determined that “there is water leak” in the sixth temporary water leakage determination, a value obtained by adding “5” to the temporary threshold used in the sixth temporary water leakage determination is set as the threshold for this setting. Further, when it is determined that “no water leak”, the temporary threshold value used in the sixth temporary water leak determination is set as the threshold value for this setting. As a result, the threshold setting unit 130 permanently sets any value in increments of 5 in the range of “10” to “90” as the threshold.

  The main water leakage determination unit 140 performs water leakage monitoring using the reference voltage value Vr corresponding to the threshold value set by the threshold value setting unit 130. That is, under the control of the digital circuit unit 20, it is determined whether or not the detection output Vs ≦ reference voltage value Vr is maintained during the operation time of about 2 seconds of the analog circuit unit 10, and if maintained, the counter 24 is incremented. .

  The determination result display control unit 150 causes the LCD 40 to display the count value counted by the main water leakage determination unit 140. The count value indicates the number of times that the acoustic vibration has been interrupted for about 2 seconds or more. The setter determines the presence or absence of water leakage based on the count value displayed on the LCD 40.

  Next, the setting of the temporary threshold value by the controller 25 will be described with a specific example with reference to FIG. Here, it is assumed that the detection output Vs is, for example, “58” during the temporary water leakage determination. The first row of the table in the figure is determined as “no water leak” as a result of the first temporary water leak determination using the temporary threshold “90 (maximum value of the temporary threshold)”. -80 ". Also, the second row of the table in the figure is the result of the second temporary water leakage determination using the temporary threshold “10 (minimum value of the temporary threshold)”. Indicates “+40”.

  In addition, the third row of the table in the figure shows that as a result of the third temporary water leakage determination using the temporary threshold “50”, it is determined that “there is water leakage”, and the threshold change amount is set to “+20”. Is shown. In this manner, the controller 25 performs the fourth, fifth, and sixth temporary water leakage determination while decreasing the absolute value of the threshold change amount by ½. And the threshold value for this setting is set based on the determination result of the 6th temporary water leak determination. For example, as shown in “sixth”, if it is determined that there is “leakage” in the sixth temporary leak determination, the threshold for this setting is changed to the temporary threshold “55” used in the sixth temporary leak determination. Set to “60” by adding “5”.

  Next, the flow of threshold setting processing (including the “threshold setting method”) will be described with reference to the flowchart of FIG. When the water leakage monitoring apparatus 1 obtains a temporary water leakage determination start instruction (S01), it determines whether t seconds (t is t ≧ 1) has elapsed (in this embodiment, t = 180 seconds), t When the second has passed (S02: Yes), the temporary water leakage determination is performed for the first time with the temporary threshold value “90” (S03). If it is determined that “there is water leakage” in the first temporary water leakage determination (S04: Yes), the installation location of the water leakage monitoring device 1 is considered inappropriate, and an error is displayed on the LCD 40 (S05). When it is determined that there is no water leakage in the first temporary water leakage determination (S04: No), the second temporary water leakage determination is performed with the temporary threshold “10” (S06). When it is determined that there is no water leak in the second temporary water leak determination (S07: No), the threshold is set to “10” (S08). If it is determined that “there is water leak” (S07: Yes), the third temporary water leak determination is performed using the temporary threshold “50” (S09).

If the water leakage monitoring device 1 determines that “there is water leakage” in the third temporary water leakage determination (S10: Yes), the change amount of the temporary threshold is set to “+80/2 ⁿ⁻² ”, and the next (nth) water leakage monitoring device 1 Temporary water leakage determination is performed (S11). When it is determined that there is no water leak in the third temporary water leak determination (S10: No), the change amount of the temporary threshold is set to “−80/2 ⁿ⁻² ”, and the next (n-th) temporary water leak determination. (S12). Here, “n” is a value indicating the number of temporary water leakage determinations, and is initialized to n = 1 at the start of the threshold setting process, and is incremented every time the temporary water leakage determination is performed. is there. After S11 or S12, it is determined whether or not n = 6 (whether or not the final temporary water leakage determination has been executed). If n = 6 is not satisfied (S13: No), the process returns to S10.

  On the other hand, in the case where n = 6 (S13: Yes) and it is determined that “there is water leak” (S14: Yes), the water leakage monitoring apparatus 1 sets the threshold value to “the sixth temporary threshold value + 5”. (S15). If n = 6 (S13: Yes) and it is determined that there is no water leakage (S14: No), the threshold is set to the “sixth temporary threshold” (S16). Although not particularly illustrated, the water leakage monitoring device 1 switches the operation mode to the “normal monitoring mode” after setting the threshold (after S08, S15, and S16).

  As described above, according to the water leakage monitoring apparatus 1 of the present embodiment, in the “threshold value setting mode”, the temporary water leakage determination for determining the presence or absence of water leakage according to whether the temporary threshold value is exceeded or not is changed. However, since it is repeated a plurality of times, the threshold for this setting can be set to an appropriate value according to the installation environment. Moreover, since the operation for setting a threshold value is unnecessary, the work load of the installer who installs the water leakage monitoring apparatus 1 can be reduced. Further, by applying the binary search algorithm and repeating the temporary water leak determination while changing the temporary threshold value so that the absolute value of the change amount of the temporary threshold value is decreased by ½, the temporary water leak determination can be efficiently performed. The threshold value can be set quickly. Furthermore, since the temporary water leakage determination for the third time and thereafter is repeated using the temporary threshold value changed based on the previous temporary water leakage determination result, the threshold value of this setting is set to a more appropriate value. Can be set.

  Moreover, according to the water leakage monitoring apparatus 1 of the present embodiment, the temporary threshold value used in the first temporary water leakage determination is set to the maximum value of the temporary threshold value. Since it is inappropriate as the installation location of 1, it is determined as an error, and the threshold setting process can be terminated. In addition, since the temporary threshold value used in the second temporary water leakage determination is the minimum value of the temporary threshold value, when the determination result is “no water leakage”, the threshold value of this setting is set to the minimum value of the temporary threshold value, and the threshold value is set. Processing can be terminated. As described above, since the number of repetitions of the temporary water leakage determination can be reduced by performing the determination using the maximum value and the minimum value of the temporary threshold value at the first time and the second time of the temporary water leakage determination, the threshold value setting process is efficiently performed. Can be done well.

  In addition, according to the water leakage monitoring apparatus 1 of the present embodiment, the installer of the water leakage monitoring apparatus 1 starts the temporary water leakage determination after a predetermined time has elapsed after acquiring the temporary water leakage determination start instruction. After leaving from the installation location, temporary water leakage determination can be started. Thereby, after installing the water leakage monitoring device 1, it is possible to prevent the threshold value reflecting the vibration of closing the manhole cover or walking by the installer from being erroneously set.

Regardless of the above embodiment, the following modifications can be employed.
[Modification 1]
In the above embodiment, the temporary threshold used in the first temporary water leakage determination is the maximum value of the temporary threshold, and the temporary threshold used in the second temporary water leakage determination is the minimum value of the temporary threshold. It may be reversed. FIG. 5 is a flowchart showing a flow of threshold setting processing according to the first modification. When the water leakage monitoring apparatus 1 obtains a temporary water leakage determination start instruction (S21), it determines whether or not t seconds (t is an integer satisfying t ≧ 1) have elapsed (in this embodiment, t = 180 seconds). ), When t seconds have elapsed (S22: Yes), the first temporary water leakage determination is performed with the temporary threshold value “10” (S23). When it is determined that there is no water leak in the first temporary water leak determination (S24: No), the threshold is set to “10” (S25). Further, when it is determined that “there is water leakage” in the first temporary water leakage determination (S24: Yes), the second temporary water leakage determination is performed based on the temporary threshold “90” (S26). When it is determined that “there is water leakage” in the second temporary water leakage determination (S27: Yes), an error is displayed on the LCD 40 (S28). When it is determined that “no water leak” (S27: No), the third temporary water leak determination is performed with the temporary threshold “50” (S29). Note that S30 to S36 are the same as S10 to S16 in FIG. As described above, even if the temporary threshold values used in the first and second temporary water leakage determinations are set to the minimum value and the maximum value of the temporary threshold values, the same effects as in the above embodiment can be obtained.

[Modification 2]
The threshold setting unit 130 of the above embodiment sets the threshold for the main setting based on the result of the temporary water leakage determination unit 120 repeating the temporary water leakage determination six times, but the threshold setting process illustrated in FIG. 4 or FIG. May be repeated a plurality of times, and the threshold for this setting may be set based on the result. That is, when the process of repeating the temporary water leakage determination six times is defined as one cycle, a plurality of cycles may be executed, and the threshold for this setting may be set based on the execution result. In this case, the threshold setting unit 130 sets a threshold candidate based on the determination result of one cycle, and sets the threshold based on a plurality of threshold candidates obtained from the determination result of a plurality of cycles. For example, when two cycles are executed, the threshold set in the first threshold setting process is set as the first threshold candidate, the threshold set in the second threshold setting process is set as the second threshold candidate, and an average value thereof Alternatively, it is conceivable to set the threshold value based on the median value. According to this configuration, there is a possibility that the threshold value cannot be set to an appropriate value, for example, when temporary vibration is detected only by executing one cycle. A highly sensitive threshold can be expected. Further, in order to set a more reliable threshold value, it is preferable to leave time between execution of one cycle and execution of the next cycle. According to this configuration, it is possible to set an appropriate threshold value even in a place where environmental noise occurs only during a specific time period.

[Modification 3]
The temporary water leakage determination unit 120 of the above embodiment repeats the temporary water leakage determination a plurality of times while changing the temporary threshold value so that the absolute value of the change amount of the temporary threshold value is decreased by 1/2. There is no need to decrease the change amount, and the change rate of the change amount does not matter. Further, it is not always necessary to decrease the absolute value of the change amount, and the temporary water leakage determination may be repeated while keeping the same absolute value of the change amount or increasing / decreasing the absolute value of the change amount. Further, the temporary water leakage determination may be repeated while maintaining the same change amount or increasing or decreasing the change amount instead of the absolute value of the change amount.
In these cases, it is not always necessary to change the temporary threshold based on the determination result of the previous temporary water leakage determination. For example, the first temporary threshold is “90”, the second temporary threshold is “80”, the third temporary threshold is “70”, and the fourth temporary threshold is “60”. You may repeat temporary water leak determination with a threshold value.

[Modification 4]
In the above embodiment, the minimum value “10” of the temporary threshold corresponds to the maximum sensitivity of the detection sensitivity for detecting the vibration level, but the minimum value of the temporary threshold necessarily corresponds to the maximum sensitivity of the detection sensitivity. The value may be close to the maximum sensitivity of the detection sensitivity. On the contrary, the maximum value of the temporary threshold does not necessarily correspond to the minimum sensitivity of the detection sensitivity, and may be a value close to the minimum sensitivity of the detection sensitivity.

[Modification 5]
In the above embodiment, the threshold value setting process (that is, adjustment of detection sensitivity for detecting acoustic vibration) is performed when the water leakage monitoring device 1 is installed. According to this configuration, it is possible to set an appropriate threshold value corresponding to environmental changes.

[Modification 6]
In the above embodiment, the “counter” resets the count value accumulated in the counter 24. However, it is possible to reset the count value every predetermined period and display the accumulated value of the counter 24 every predetermined period on the LCD 40. Good. For example, when the count value is reset every day, the count value for one day is recorded in a storage device provided in the water leakage monitoring device 1 at a predetermined time every day, and the “person” controls the operation panel 30. It is only necessary that the count value for each day can be displayed on the LCD 40 by operating.

[Modification 7]
In the above embodiment, the count value accumulated in the counter 24 is displayed on the LCD 40, and the “person” determines the presence or absence of water leakage. However, the water leakage monitoring device 1 may automatically determine the presence or absence of water leakage. In this case, if the accumulated value of the counter 24 within a predetermined period is equal to or greater than a predetermined number, it may be determined that “no water leakage”. Moreover, what is necessary is just to display the determination result of the presence or absence of water leakage on LCD40.

[Modification 8]
In addition, instead of displaying the count value accumulated in the counter 24 or the determination result of water leakage on the LCD 40, the water leakage monitoring device 1 is provided with a communication unit, and data indicating the determination value of the count value or water leakage is provided. It is good also as a structure which transmits to an external device. As the external device, an information terminal possessed by the inspector, a server connected to the water leakage monitoring device 1 via a network such as a telephone line or the Internet, and the like can be considered.

[Modification 9]
In the above embodiment, in the “normal monitoring mode”, the counter 24 is incremented when the state where the vibration transmitted to the water pipe is below a predetermined threshold is maintained for a predetermined time, but conversely, the vibration transmitted to the water pipe is predetermined. The counter 24 may be incremented when the state of level or higher is maintained for a predetermined time. In this case, if the count value is large, it means that the acoustic vibration transmitted through the water pipe is not interrupted. Therefore, it can be determined that “there is water leakage (the possibility of water leakage is high)”.

[Modification 10]
In said embodiment, although the temporary water leak determination was performed with the water leak monitoring apparatus 1 which performs water leak monitoring, you may use the exclusive machine which performs temporary water leak determination. In this case, the dedicated machine requires an output unit that outputs a threshold set based on the result of determination of temporary water leakage. As the output unit, a display unit for displaying the set threshold value, a communication unit for transmitting the set threshold value to the water leakage monitoring apparatus 1, and the like can be considered.

[Modification 11]
You may provide the program which implement | achieves each function part shown in FIG. 2 using the hardware constitutions of the water leak monitoring apparatus 1 shown in said embodiment and modification. The program may be provided by being stored in various recording media (CD-ROM, flash memory card, etc.). That is, a program for causing a computer to function as each functional unit of the water leakage monitoring apparatus 1 and a recording medium on which the program is recorded are also included in the scope of rights of the present invention. Other modifications can be made as appropriate without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Water leak monitoring apparatus, 110 ... Start instruction acquisition part, 120 ... Temporary water leak determination part, 130 ... Threshold value setting part, 140 ... This water leak determination part, 150 ... Determination result display control part

Claims (8)

A threshold setting method for setting a threshold for determining the presence or absence of water leakage,
Computer
The temporary water leakage determination for determining the presence or absence of water leakage depending on whether or not the vibration level of the acoustic vibration transmitted through the water pipe exceeds a temporary threshold that is a temporarily set threshold is repeated n times while changing the temporary threshold ( However, n is an integer such that n ≧ 3), and whether or not the temporary water leakage determination after the third time exceeds the temporary threshold value changed based on the previous determination result of the temporary water leakage determination. A temporary water leakage determination step for determining the presence or absence of water leakage in response ,
Based on the determination result of the n-th temporary water leakage determination , a threshold setting step for permanently setting the threshold value , and
The first temporary threshold value used in the first temporary water leakage determination is the maximum value or the minimum value of the temporary threshold value,
When the first temporary threshold is the maximum value of the temporary threshold, the second temporary threshold used in the second temporary leakage determination is the minimum value of the temporary threshold, and the first temporary threshold is The threshold setting method , wherein the minimum value of the temporary threshold is the maximum value of the temporary threshold . A threshold setting method for setting a threshold for determining the presence or absence of water leakage,
Computer
Temporary water leakage determination for determining the presence or absence of water leakage depending on whether or not the vibration level of the acoustic vibration transmitted through the water pipe exceeds a temporary threshold that is a temporarily set threshold is repeated a plurality of times while changing the temporary threshold. A water leakage determination step;
Based on the determination result of the temporary water leakage determination step, a threshold setting step for permanently setting the threshold;
A start instruction acquisition step of acquiring a start instruction for the temporary water leakage determination, and
The temporary water leakage determination step starts the temporary water leakage determination after a lapse of a predetermined time after obtaining the start instruction . The temporary leakage determination step, the while changing the temporary threshold as the absolute value of the temporary threshold change amount gradually decreases, to claim 1 or 2, characterized in that repeated a plurality of times the temporary leakage determination The threshold setting method described. The temporary leakage determination step, the while changing the temporary threshold as the absolute value of the temporary threshold change amount decreases by 1/2, to claim 3, wherein the plurality of times the temporary leakage determination The threshold setting method described. The threshold setting step includes:
A threshold value candidate is set based on a determination result of the temporary water leakage determination step, and the threshold value is permanently set based on a plurality of the threshold value candidates obtained by repeating the temporary water leakage determination step a plurality of times. The threshold value setting method according to any one of claims 1 to 4 . A water leakage monitoring device capable of setting a threshold for determining the presence or absence of water leakage,
The temporary water leakage determination for determining the presence or absence of water leakage depending on whether or not the vibration level of the acoustic vibration transmitted through the water pipe exceeds a temporary threshold that is a temporarily set threshold is repeated n times while changing the temporary threshold ( However, n is an integer such that n ≧ 3), and whether or not the temporary water leakage determination after the third time exceeds the temporary threshold value changed based on the previous determination result of the temporary water leakage determination. A temporary water leakage determination unit that determines the presence or absence of water leakage,
a threshold setting unit that permanently sets the threshold based on the determination result of the n-th temporary water leakage determination ,
The first temporary threshold value used in the first temporary water leakage determination is the maximum value or the minimum value of the temporary threshold value,
When the first temporary threshold is the maximum value of the temporary threshold, the second temporary threshold used in the second temporary leakage determination is the minimum value of the temporary threshold, and the first temporary threshold is In the case of the minimum value of the temporary threshold, the leak monitoring apparatus is characterized by being the maximum value of the temporary threshold . A water leakage monitoring device capable of setting a threshold for determining the presence or absence of water leakage,
Temporary water leakage determination for determining the presence or absence of water leakage depending on whether or not the vibration level of the acoustic vibration transmitted through the water pipe exceeds a temporary threshold that is a temporarily set threshold is repeated a plurality of times while changing the temporary threshold. A water leakage determination unit;
Based on the determination result of the temporary water leakage determination unit, a threshold setting unit for permanently setting the threshold;
A start instruction acquisition unit for acquiring a start instruction for the temporary water leakage determination,
The said temporary water leak determination part starts the said temporary water leak determination after progress for a predetermined time after acquiring the said start instruction | indication, The water leak monitoring apparatus characterized by the above-mentioned . The program for making a computer perform each step in the threshold value setting method of any one of Claim 1 thru | or 5 .

Images