JP5246586B2 - Water discharge device - Google Patents

Description

The present invention relates to a water discharge device, and more specifically, to a water discharge device that is provided in a hand-washing place, a toilet, a kitchen, and the like and controls water stoppage of a water discharge flow using a radio wave sensor such as a microwave.

As a water discharge device that automatically controls water discharge by detecting the human body, the human body or human hand is detected and the presence or absence of the detected body is detected based on the intensity of the reflected radio wave from the detected body. There is a water discharge device that stops water when the object to be detected is no longer detected.

When a transmission wave such as a microwave hits the detection object, a reflected wave or a transmitted wave is generated. By receiving this reflected wave or transmitted wave, it is possible to detect a detected object such as a human body,
Can be used for faucet devices.

A human body detection device that detects a human body by receiving a reflected wave of a radiated microwave from a human body, obtaining a power spectrum of the Doppler frequency signal, and comparing the peak value with a predetermined threshold is disclosed. (For example, refer to Patent Document 1).
Japanese Patent Laid-Open No. 9-80150

However, when judging based on the reflected wave from the body to be detected (human body or human hand), even if the hand is removed from the water discharge flow and the human body is separated from the faucet device, only the water discharge flow is detected as the detection target. Thus, water discharge may not stop. In addition, during use of water discharge, water may stop if the reflection intensity from a human hand or the like becomes weak.

An object of this invention is to provide the water discharging apparatus which prevents misdetection and can stop water reliably or continue water discharging.

According to the present invention, a radio wave is radiated to the water discharger and the detected body, a reflected wave of the radiated radio wave is received, information on the movement of the detected body is obtained , and a predetermined Doppler type sensor unit for outputting a detection signal having an intensity and frequency, and a control unit for controlling the ejection stop water from based on the detection signal from the sensor unit the water discharger, storage means for storing a predetermined threshold value The sensor unit is arranged so that at least a part of the radio wave radiated from the sensor unit hits a water discharge flow discharged from the water discharge unit, and the control unit outputs the sensor unit Based on the intensity of the detection signal in the first frequency band and the intensity in the second frequency band lower than the first frequency band , the state of the water discharge flow is determined, and water discharge from the water discharge unit It has been made to control the, First, when the intensity in the first frequency band is larger than the first threshold value, water discharge is continued. Second, when the intensity in the second frequency band is smaller than the second threshold value, water discharge is performed. And, thirdly, if the intensity in the first frequency band is smaller than the first threshold and the intensity in the second frequency band is larger than the second threshold, water is stopped. The first threshold value and the second threshold value are determined based on the intensity of the detection signal in a state where no object is put in the water discharge flow discharged from the water discharge unit. Is provided.

ADVANTAGE OF THE INVENTION According to this invention, the water discharging apparatus which can prevent erroneous detection and can stop water reliably or can continue water discharging can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
Drawing 1 is a figure showing the composition of the discharging apparatus of a 1st embodiment of the present invention, (a) is a top view and (b) is a sectional side view. This water discharge device includes a sensor unit 100 and a control unit 200. In the case of the specific example shown in FIG. 1, the sensor unit 100 and the control unit 200 are connected to the water supply hose 1.
A water faucet device is configured together with 0, a spout 30, a water receiving part 40 made of ceramics, and the like. In the subsequent drawings, the same elements as those described with reference to the previous drawings are denoted by the same reference numerals, and detailed description thereof is omitted.

The sensor unit 100 radiates (transmits) high-frequency radio waves such as microwaves or millimeter waves,
It is a high-frequency sensor that receives a reflected wave of a radiated radio wave from a detected object, detects the presence or absence and state of the detected object, and outputs a detection signal.

2 and 3 are block diagrams of two specific examples of the sensor unit 100 and the control unit 200. FIG.
The sensor unit 100 includes an antenna 112, a transmission unit 114, a reception unit 116, and a mixer unit 118.
Is provided. The antenna 112 connected to the transmission unit 114 emits radio waves in a frequency band of 10 kHz to 100 GHz such as high frequency, microwave, or millimeter wave. Specifically, a transmission wave T1 having a frequency of, for example, 10.525 GHz is radiated from the antenna 112. A reflected wave or transmitted wave T <b> 2 from a detection object such as a human body is input to the receiving unit 116 via the antenna 112. Here, the antenna may have a common transmission side and reception side as shown in FIG. 2, or the transmission unit 114 has an antenna 1 as shown in FIG. 3.
12a may be connected, and the antenna 112b may be connected to the receiving unit 116.
A part of the transmission wave and the reception wave are respectively input to the mixer unit 118 and synthesized, and an output signal reflecting the Doppler effect, for example, is output. The detection signal output from the mixer unit 118 is output to the control unit 200. The control unit 200 includes a filter 210 and a frequency detection unit 2.
20, the determination part 230, the memory | storage means 240, and the valve | bulb 250 are provided. Mixer section 118
First, high frequency components are removed from the detection signal output from the filter 210.
The filtering frequency at this time can be set to 200 Hz, for example. As will be described in detail later, in this embodiment, the filter 210 may not be provided.

The detection signal output from the mixer unit 118 has a waveform in which a high-frequency signal is superimposed on a low-frequency baseline. The high frequency component includes information on the Doppler effect. That is, when the detected object such as a human body or water moves, the wavelength of the reflected wave shifts due to the Doppler effect. The Doppler frequency ΔF (Hz) can be expressed by the following equation (1).

ΔF = Fs−Fb = 2 × Fs × v / c Equation (1)

Where Fs: transmission frequency (Hz)
Fb: reflection frequency (Hz)
v: object moving speed (m / s)
c: speed of light (= 300 × 106 m / s)

When the detected object moves relative to the sensor unit 100, as represented by the equation (1),
An output signal including a frequency ΔF proportional to the speed v is obtained. The output signal has a frequency spectrum, and there is a correlation between the peak frequency corresponding to the peak of the spectrum and the velocity v of the moving object. Therefore, the velocity v can be obtained by measuring the Doppler frequency ΔF. In Japan, for the purpose of detecting a human body, 10.50 to 10.55G.
A frequency of Hz or 24.05 to 24.25 GHz can be used.

In the present embodiment, the sensor unit 100 is installed in the water receiving unit 40 so that at least a part of the radiated radio wave hits the water discharge flow from the water discharge port 30. That is, the sensor unit 10
0 is configured to irradiate a water discharge flow from the water discharge port 30 with radio waves and receive the radio waves reflected by the water discharge flow.

On the other hand, the control unit 200 detects the disturbance (or state) of the discharged water discharged from the outlet 30 based on the detection signal from the sensor unit 100, and the disturbance (or state) of the discharged water falls within a predetermined range. Then, water discharge from the water discharge port 30 is stopped. That is, the determination unit 230 compares the predetermined threshold stored in the storage unit 240 with the detection signal, and based on the result, the valve 2
50 is opened and closed. The flow rate of the discharged water flow is set to a constant flow rate by a metering valve (not shown).

FIG. 4 is a schematic diagram for explaining an angle θ formed by the maximum directivity direction of the radio wave of the sensor unit 100 and the tangential direction of the discharged water flow.
FIG. 5 is a graph illustrating the voltage characteristics of the frequency-side component of the midrange of the detection signal with respect to the angle θ formed between the tangent line of the discharged water flow and the maximum directivity direction of the sensor unit 100.

About the water discharge flow from the water discharge port 30, when all the frequency bands of a detection signal are set to 0-100 Hz, many components of the frequency side of the middle region of 50 Hz or more are also contained. As shown in FIG. 5, the voltage value of the middle frequency side component in the detection signal becomes small when the maximum directivity direction of the radio wave is substantially orthogonal to the flow (tangential direction) of the water discharge flow. More specifically, θ is about 80 ° to
It becomes small when it is about 120 °. This is because the Doppler effect is less likely to appear because the traveling direction of radio waves approaches the direction perpendicular to the direction of water discharge.
Accordingly, when the sensor unit 100 is arranged so that the maximum directivity direction of the radio wave radiated from the sensor unit 100 and the water discharge flow discharged from the water discharge unit are substantially orthogonal, the water discharge flow is not disturbed. In the detection signal (when only water is discharged), the frequency component in the middle range can be detected as small as possible. In addition, the directivity direction range of the sensor unit 100 can be set within a range of 35 ° to 40 ° vertically and horizontally with respect to the maximum directivity direction, for example.

On the other hand, when the water discharge flow is disturbed, for example, the water scattered by the water discharge flow hitting a human hand is scattered in various directions, and is also scattered in a direction approaching or moving away from the sensor unit 100. In this case, even if the sensor unit 100 is arranged so that the maximum directivity direction is substantially orthogonal to the discharged water flow as described above, not only the low frequency side component but also the middle region corresponding to the disturbance of the discharged water flow. A detection signal of the frequency side component is obtained.

When the direction of water discharge and the maximum radiation direction of radio waves are not substantially orthogonal, the difference between the detection signal of only the water discharge flow and the detection signal of the state where the water discharge flows against a human hand or the like tends to be small. . On the other hand, by making the direction of the water discharge flow and the maximum radiation direction of the radio wave substantially orthogonal, the frequency side component of the middle region does not appear in the detection signal of only the water discharge flow, and there is a hand etc. in the water discharge flow When disturbance occurs, a frequency component in the middle band appears in the detection signal. That is, there is a clear difference between the detection signal for only the discharged water flow and the detection signal when the discharged water flow is disturbed by a hand or the like. For this reason, it is possible to perform such control that the water discharge is continued when the hand or the like is in contact with the water discharge flow, and the water is stopped when the detection signal of only the water discharge flow is obtained.

FIG. 6 is a schematic diagram showing a faucet device in the case of only water discharge and in the case of using water discharge,
) When water discharge is not used (when only water is discharged), (b) when a person is washing hands as an example when water discharge is used (when water discharge is disturbed), (C) Cup 5
When the water is pooled at 00, each represents.

FIG. 7 is a graph illustrating the level of the detection signal obtained from the sensor unit 100 in each case illustrated in FIGS. That is, the vertical axis in the figure represents the voltage value of the detection signal obtained from the sensor unit 100, and the horizontal axis represents time.
As shown in FIG. 7, the amplitude of the detection signal centered on the reference value is large in the state where the water discharge is touched, whereas the water flow state (discharge) Only water flow)
The detection signal has a small amplitude. And the amplitude of the detection signal in the state where the water discharge is stored in a cup or the like is further reduced.
As will be described in detail later, in the power spectrum of the detection signal of only the discharged water flow, for example, 20H
It has a maximum peak of amplitude in the frequency band of z to 30 Hz. On the other hand, in the power spectrum of the detection signal at the time of hand washing (when water discharge hits a human hand), for example, 0 to 30H
There are a plurality of very large amplitude peaks in the frequency band of z, and amplitude peaks are also formed in the frequency band of 40 Hz to 50 Hz. This is caused by the spilled water hitting a hand or the like, and the flow is disturbed or scattered around. In addition, as shown in FIG. 6C, the power spectrum of the detection signal at the time of water accumulation (when the water is accumulated in the cup) has a maximum peak of amplitude in the frequency band of 0 to 10 Hz, and is 30 Hz or more. The power spectrum hardly appears in the frequency band. This is because the water calms down in the cup and moves slowly so that the peak disappears.

And as shown in FIG. 7, even if it does not limit a detection signal to a specific frequency, the level of a detection signal is large in the state which touched the discharged water flow, and on the other hand, it discharges from a water discharging part. The level of the detection signal of the water flow state (only the water discharge flow) is low. And the level of the detection signal in a state where water is accumulated in a cup or the like is further reduced.
Therefore, as illustrated in FIG. 7, the discharge water can be controlled by appropriately determining the first threshold value and the second threshold value between the levels (amplitudes) of these detection signals. That is, a value larger than the amplitude of the detection signal in the water flow state when only water is discharged is set as the first threshold, and the detection signal in the water flow state when only water is discharged as the second threshold. A value smaller than the amplitude of is set. In FIG. 7, only one side viewed from the reference value of the detection signal oscillating around the reference value is shown, and only the upper limit values of the first threshold value and the second threshold value set as the amplitude are shown. expressed.

FIG. 8 is a flowchart for performing water stop control based on the first threshold.
A detection signal is acquired from the sensor unit 100 (step S1), and the amplitude is compared with a first threshold value stored in the storage unit 240 (step S30). In the present embodiment, the detection signal is not necessarily filtered to a specific frequency band. And when the amplitude of a detection signal is larger than a 1st threshold value (step S32: YES), since the water discharge flow is in the state which hits a hand etc., water discharge is continued and acquisition and comparison of a detection signal are repeated. .
On the other hand, when the amplitude of the detection signal is equal to or less than the first threshold (step S32: NO), the water discharge is not in a state of hitting a hand and the water is stopped (step S4). In this way, the discharge water can be controlled without filtering the detection signal obtained from the sensor unit 100 into a specific frequency band.

FIG. 9 is a flowchart for controlling water discharge based on the second threshold.
Also in this specific example, the detection signal is acquired (step S1), and the amplitude is stored in the storage unit 240.
(Step S40). Also in this specific example, the detection signal is not necessarily filtered to a specific frequency band. If the amplitude of the detection signal is smaller than the second threshold value (step S42: YES), since the water pool by a cup or the like is being executed, water discharge is continued, and the detection signal is acquired and compared. And repeat.
On the other hand, when the amplitude of the detection signal is equal to or greater than the second threshold (step S42: NO), the cup is removed and only the water discharge flow is present, so water is discharged (step S4). Even in this specific example, it is possible to control water discharge without filtering the detection signal to a specific frequency band.

FIG. 10 is a graph for explaining the control of water stoppage in consideration of both the first threshold value and the second threshold value. In FIG. 10 as well, the detection signal that vibrates around the reference value represents only one side of the reference value, and the first threshold value and the second threshold value that are set as the amplitude around the reference value also Only their upper values were represented.
For example, when the hand or the like is removed from the state in which the water discharge is applied and the state is changed to the state of only the water discharge flow, the amplitude of the detection signal is the first as shown by the thick solid line in FIG. The level changes from a level larger than the threshold value to a level between the first threshold value and the second threshold value. In addition, the detection signal in this case does not necessarily need to be filtered to a specific frequency band. On the other hand, when the water discharge flow is stored in a cup or the like and the state is changed to a state where only the water discharge flow is removed by removing the cup or the like, the amplitude of the detection signal is represented by a thin solid line in FIG.
The level is changed from a level smaller than the second threshold to a level between the first threshold and the second threshold.
Note that the amplitude of the detection signal occurs discretely with the passage of time, but in FIGS. 10 and 11, the temporal change in amplitude is represented by a continuous curve for convenience.

Accordingly, in any of these cases, the water stoppage is executed when a predetermined time E (fifth predetermined time) has elapsed since the amplitude of the detection signal has changed to a level between the first threshold value and the second threshold value. do it. In this way, water can be surely stopped when these operations are completed, whether washing by hand with a water discharger or storing water in a cup or the like.

FIG. 11 is a graph for explaining another specific example of the control of the water stoppage in consideration of both the first threshold value and the second threshold value.
Depending on how the water discharge device is used, for example, a state where a hand or the like hits the water discharge flow may make a transition to a state where water is stored by a cup or the like. In this case, the amplitude of the detection signal changes from a level larger than the first threshold to a level smaller than the second threshold, as represented by a thick solid line in FIG.
On the other hand, there may be a transition from a state where the discharged water flow is pooled by a cup or the like to a state where the discharged water flow hits a hand or the like. In this case, as indicated by a thin solid line in FIG. 11, the amplitude of the detection signal changes from a level smaller than the second threshold value to a level larger than the first threshold value. In any of these cases, it is desirable to continue water discharge without stopping water. For this purpose, a state in which the amplitude of the detection signal is at a level between the first threshold value and the second threshold value is a predetermined time E.
If it is not continued for a long time, water discharge may be continued as it is. If it does in this way, when the level of a detection signal crosses the 1st and 2nd threshold value one by one, it can give a comfortable usability without continuing unnecessary water stop and continuing water discharge. .

These threshold values are appropriately stored in the storage unit 240 of the control unit 200. Determination unit 230
Is a detection signal acquired from the sensor unit 100, a threshold value stored in the storage means 240,
Are compared to determine whether or not to stop water, and the opening and closing of the valve 250 is controlled.

These threshold values may be determined in advance and stored in the storage unit 240, or may be appropriately determined by learning and stored in the storage unit 240 in an environment where the water discharge device is installed and used. May be.

When the threshold value is determined in advance, for example, when designing the water discharge device, the threshold value can be determined in advance through experiments or the like and stored in the storage unit 240. Alternatively, before the water discharge device is manufactured and shipped at the factory, or when the water discharge device is installed at the site, the threshold value may be determined by discharging water and stored in the storage unit 240.

On the other hand, when the threshold value is determined by learning, for example, after the water discharge device is installed at the site and the operation is started, the control unit 200 (see FIGS. 2 and 3) causes the water discharge unit to discharge water every predetermined time. The threshold value can be determined based on the detection signal in that state and stored in the storage unit 240.
In this case, the determination and storage of such a threshold is performed during a time period in which the water discharge device is not used frequently (for example,
It is good to execute at night). In addition, the control unit 200 (
The threshold value may be determined and stored in a time zone in which learning is performed and the use frequency determined in this way is low (see FIGS. 2 and 3). Alternatively, a threshold value may be newly determined and stored when one or both of water discharge and water stoppage are executed a predetermined number of times.

If the threshold value is appropriately learned after the operation of the water discharge device, for example, even when the supply water pressure fluctuates and the level of the detection signal obtained from the water discharge flow fluctuates, it always operates based on the optimum threshold value. Can be made.

FIG. 12 is a schematic diagram for explaining the relationship between the detection signal and the threshold value.
As illustrated in FIG. 12A, the detection signal is detected as an AC signal that vibrates around a predetermined reference value. This reference value (DC component) may vary depending on the detection conditions.
Therefore, in the present embodiment, by examining the relationship between the amplitude of the detection signal that vibrates around the reference value (the interval between the plus-side peak and the minus-side peak) and the amplitude threshold value, Determine the state. Alternatively, as shown in FIG. 12A, a predetermined threshold is set on at least one of the plus side and the minus side with the reference value as the center, and the amplitude of vibration around the reference value of the detection signal is the threshold value. It is possible to determine the state of the discharged water flow depending on whether or not.

Alternatively, as illustrated in FIG. 12B, the absolute value of the detection signal may be obtained by inverting the detection signal around the reference value. In other words, this is equivalent to comparing the amplitude of vibration centered on the reference value of the detection signal with a predetermined threshold value. Also in this case, it is possible to determine the state of the discharged water flow based on whether or not the amplitude of vibration centered on the reference value of the detection signal exceeds a predetermined threshold value.

FIG. 13 is a schematic view illustrating a specific example of the detection signal.
FIG. 13 (a) shows a state where only the water discharge flow (corresponding to FIG. 6 (a)), FIG. 13 (b) shows a state where water is stored in the cup (corresponding to FIG. 6 (c)), FIG. ) Represents the state (corresponding to FIG. 6B) where the water discharge is in hand.

Compared with the detection signal (FIG. 13 (a)) in the state of only the water discharge flow, the amplitude of the detection signal (FIG. 13 (b)) in the state where the water is accumulated in the cup is small, and the state in which the water discharge flow is at hand ( It can be seen that the amplitude of FIG. Therefore, as shown in FIGS. 13A to 13C, the first threshold value and the second threshold value are set, and the relationship between the amplitude of the detection signal and these threshold values is examined, so that the water discharge flow Can be determined. That is, when the amplitude of the detection signal does not exceed the first threshold value but exceeds the second threshold value, it can be determined that only the water discharge flow (FIG. 13A). Further, when the amplitude of the detection signal does not exceed the second threshold value, it can be determined that the water is stored in the cup (FIG. 13B). On the other hand, when the amplitude of the detection signal exceeds the first threshold value, it can be determined that the discharged water flow is being handled (FIG. 13C).

FIGS. 14A to 14C show the detection signals folded around the reference value in the specific example shown in FIGS. 13A to 13C and further corrected to the vicinity of 0. It is a graph.
By wrapping around the reference value, the absolute value of the detection signal can be obtained. That is, the amplitude of the detection signal is obtained. Therefore, the state of the discharged water flow can be detected by examining the relationship between the amplitude and the first and second threshold values.

That is, as shown in FIGS. 14A to 14C, the first threshold value and the second threshold value are set, and the amplitude of the detection signal does not exceed the first threshold value but exceeds the second threshold value. If it is, it can be determined that there is only a water discharge flow (FIG. 14A). Further, when the amplitude of the detection signal does not exceed the second threshold value, it can be determined that the water is stored in the cup (FIG. 14B). On the other hand, when the amplitude of the detection signal exceeds the first threshold value, it can be determined that the water discharge is in a state of being handled (FIG. 13).
(C)).

Here, in the determination described above with reference to FIGS. 13 and 14, for example, the frequency at which the peak of the detection signal exceeds the threshold value may be considered. That is, the peak of the detection signal may increase due to noise or the like. In order to prevent such false detection due to noise, the frequency of detection signal peaks exceeding a predetermined threshold is examined, and when the frequency exceeds a predetermined value,
It may be determined that the peak of the detection signal has exceeded the threshold value. In order to prevent erroneous detection due to noise, the time average of the detection signal may be calculated, and the amplitude may be compared with a predetermined threshold in the same manner as described above.

Hereinafter, a specific example of the control of the discharge water based on the detection signal will be described.
FIG. 15 is a graph for explaining a first specific example of control of water stoppage based on a detection signal, in which the horizontal axis represents time and the vertical axis represents the amplitude of the detection signal. That is, FIG. 15 represents the time change of the amplitude of the detection signal. Here, the amplitude of the detection signal is equivalent to the peak value in the absolute value obtained by folding the detection signal around the reference value as exemplified in FIG. In addition, the amplitude of the detection signal occurs discretely with the passage of time, but in FIG. 15 and the subsequent drawings, the time change of the amplitude is represented by a continuous curve for convenience.

In the specific example shown in FIG. 15, a first threshold value larger than the amplitude of the detection signal in a state where water is only discharged (corresponding to FIG. 6A) is set. Here, the first threshold value is shown in FIG.
As described above with reference to FIGS. 14 and 14, the hand is distorted by the water discharge (see FIG. 6 (
It is set to a value smaller than the amplitude of the detection signal in b).

A state in which the amplitude of the detection signal falls below the first threshold is a predetermined time A (first predetermined time).
If it continues only, the valve | bulb 250 (refer FIG. 1) will be closed and the water discharge from the water discharge port 30 will be stopped (
Water stop). That is, if the state where the amplitude of the detection signal is lower than the first threshold value continues for a predetermined time A, it is possible to determine that the water discharge is not used and stop the water. In this way, water can be reliably stopped when not in use.

For example, when water is discharged by a switch and water stop is executed by a detection signal of the sensor unit 100, water is reliably stopped when the switch is not used for a predetermined time A from the moment a when water discharge is started. be able to.

FIG. 16 is a graph for explaining a second specific example of the control of the water stoppage based on the detection signal, in which the horizontal axis represents time and the vertical axis represents the amplitude of the detection signal.
Also in this specific example, the first threshold value larger than the amplitude of the detection signal in a state where water is only discharged (corresponding to FIG. 6A) is set. Then, when the amplitude of the detection signal falls below the first threshold from the state where the first threshold is exceeded, the valve 250 (see FIG. 1) is closed to stop water discharge from the water outlet 30 (water stoppage). Typically, this corresponds to a case where the state where the discharged water flow is disturbed by hand or the like (corresponding to FIG. 6B) transitions to a state where only the discharged water flow corresponds (corresponding to FIG. 6A).
If it does in this way, it will also become possible for a user to remove a hand etc. from a water discharge flow, and to stop water before changing to the state of only a water discharge flow. That is, the water can be stopped at an early timing, the usability is excellent, and a water saving effect is also obtained.

FIG. 17 is a graph for explaining a third specific example of the control of water discharge based on the detection signal, where the horizontal axis represents time and the vertical axis represents the amplitude of the detection signal.
Also in this specific example, the first threshold value larger than the amplitude of the detection signal in a state where water is only discharged (corresponding to FIG. 6A) is set. Then, when the amplitude of the detection signal exceeds the first threshold value from the first threshold value and falls below the first threshold value and continues to be smaller than the first threshold value for a predetermined time B (second predetermined time), the valve 250 (FIG. 1) is closed to stop water discharge from the water outlet 30 (water stoppage). This is typically a state in which the water discharge is disturbed by the hand (see FIG. 6 (
This corresponds to a case where the water is stopped when a predetermined time B has elapsed after a transition from a state corresponding to (b)) to a state of only the water discharge flow (corresponding to FIG. 6 (a)).
In this way, the water can be stopped at the timing determined by the predetermined time B after the user removes his / her hand from the water discharge flow. That is, the timing of water stoppage can be adjusted according to the site to be used, the type of faucet, and the user's preference.

FIG. 18 is a graph for explaining a fourth specific example of the control of water discharge based on the detection signal, where the horizontal axis represents time and the vertical axis represents the amplitude of the detection signal.
This example is similar to the third example described above with reference to FIG. That is, also in this specific example, the first threshold value larger than the amplitude of the detection signal in a state where water is discharged (corresponding to FIG. 6A) is set. Then, from the state where the amplitude of the detection signal exceeds the first threshold, the first
When the state that is lower than the first threshold and smaller than the first threshold continues for a predetermined time B (second predetermined time), the valve 250 (see FIG. 1) is closed to stop water discharge from the water outlet 30 (water stoppage) ).
However, if the amplitude of the detection signal exceeds the first threshold before the elapse of the predetermined time B, then the amplitude is again below the first threshold and the state smaller than the first threshold is the predetermined time B. If it continues only, stop the water. That is, when the amplitude of the detection signal exceeds the first threshold again during the counting of the predetermined time B, the counting of the predetermined time B is stopped, reset, and restarted from the beginning.

In this way, for example, when the user wants to put the hand in the water discharge flow again immediately after the user has removed his / her hand from the water discharge flow, the water discharge flow does not stop immediately and the user's use is finished. Later, the water can be reliably stopped. That is, when the water discharge flow is used repeatedly intermittently, the water is not stopped and the feeling of use is excellent.

FIG. 19 is a graph for explaining a fifth specific example of the control of water stoppage based on the detection signal, where the horizontal axis represents time and the vertical axis represents the amplitude of the detection signal.
Also in this specific example, the first threshold value larger than the amplitude of the detection signal in a state where water is only discharged (corresponding to FIG. 6A) is set. Furthermore, in this specific example, a second threshold value smaller than the amplitude of the detection signal in a state where water is only discharged (corresponding to FIG. 6A) is set. Here, as described above with reference to FIGS. 13 and 14 and the like, the first threshold value is smaller than the amplitude of the detection signal in a state (corresponding to FIG. 6B) in which the water discharge is disturbed by a hand or the like. Set to. On the other hand, the second threshold value is set to a value larger than the amplitude of the detection signal in a state where the water is stored in a cup or the like (corresponding to FIG. 6C) as described above with reference to FIGS. .
Then, if the state where the amplitude of the detection signal is smaller than the first threshold and larger than the second threshold continues for a predetermined time C (third predetermined time), the water is stopped. That is, when the state where the water is not accumulated in the cup or the like and the state where the water discharge is not disturbed by the hand or the like continues for a predetermined time C, the water is stopped.

In this way, similarly to the first specific example described above with reference to FIG. 15, the water can be reliably stopped when it is not used for a predetermined time C.

FIG. 20 is a graph for explaining a sixth specific example of control of water stoppage based on a detection signal, in which the horizontal axis represents time and the vertical axis represents the amplitude of the detection signal.
Also in this specific example, as in the fifth specific example, the first threshold value larger than the amplitude of the detection signal in the state of just discharging water (corresponding to FIG. 6A) is set. Furthermore, a second threshold value smaller than the amplitude of the detection signal in a state where water is only discharged (corresponding to FIG. 6A) is set. Here, as described above with reference to FIGS. 13 and 14 and the like, the first threshold value is smaller than the amplitude of the detection signal in a state (corresponding to FIG. 6B) in which the water discharge is disturbed by a hand or the like. Set to. On the other hand, the second threshold value is set to a value larger than the amplitude of the detection signal in a state where the water is stored in a cup or the like (corresponding to FIG. 6C) as described above with reference to FIGS. .
Then, from the state where the amplitude of the detection signal is smaller than the second threshold, when exceeding the second threshold,
Stop water. In other words, if you remove the cup from the state where the water is in the cup,
Stop water.

If it does in this way, similarly to the 2nd example mentioned above about Drawing 16, it will also become possible for a user to take out a cup etc. from a water discharge flow, and to stop before changing to a state of only a water discharge flow. That is, the water can be stopped at an early timing, the usability is excellent, and a water saving effect is also obtained.

FIG. 21 is a graph for explaining a seventh specific example of the control of the water stoppage based on the detection signal, in which the horizontal axis represents time and the vertical axis represents the amplitude of the detection signal.
Also in this specific example, as in the fifth specific example, the first threshold value larger than the amplitude of the detection signal in the state of just discharging water (corresponding to FIG. 6A) is set. Furthermore, a second threshold value smaller than the amplitude of the detection signal in a state where water is only discharged (corresponding to FIG. 6A) is set.

Then, when the amplitude of the detection signal is smaller than the second threshold and exceeds the second threshold, and the state smaller than the first threshold is continued for a predetermined time D (fourth predetermined time), the water is stopped. . In this case, the water is stopped when a predetermined time D elapses from a state where the water is accumulated by a cup or the like (corresponding to FIG. 6C) to a state where only the water discharge is performed (corresponding to FIG. 6A). Corresponds to the case.
In this way, the water can be stopped at a timing determined by the predetermined time D after the user pulls out a cup or the like from the water discharge flow. That is, the timing of water stoppage can be adjusted according to the site to be used, the type of faucet, and the user's preference.

FIG. 22 is a graph for explaining an eighth specific example of control of water discharge based on a detection signal, in which the horizontal axis represents time and the vertical axis represents the amplitude of the detection signal.
This example is similar to the seventh example described above with reference to FIG. That is, also in this specific example, as in the fifth specific example, the first threshold value larger than the amplitude of the detection signal in the state of just discharging water (corresponding to FIG. 6A) is set. Furthermore, a second threshold value smaller than the amplitude of the detection signal in a state where water is only discharged (corresponding to FIG. 6A) is set.

Then, the detection signal is detected before the predetermined time D (fourth predetermined time) elapses from the state in which the amplitude of the detection signal exceeds the second threshold from the state smaller than the second threshold and is smaller than the first threshold. When the amplitude of the signal becomes smaller than the second threshold again, the water is stopped when the amplitude again exceeds the second threshold and continues to be smaller than the first threshold for a predetermined time D. That is, when the amplitude of the detection signal falls below the second threshold again during the counting of the predetermined time D, the counting of the predetermined time D is stopped, reset, and the counting is started again from the beginning.

In this way, for example, when a user pulls out a cup from the water discharge flow and immediately wants to put a cup again in the water discharge flow, the water discharge flow does not stop immediately and the user's use ends. After that, it can stop water reliably. That is, when the water discharge flow is used repeatedly intermittently, the water is not stopped and the feeling of use is excellent.

Further, when the water is stopped by counting the predetermined time D in this way, for example, when the user who has accumulated the water in the cup removes the cup from the water discharge flow and subsequently washes the hand, If it is put in the water discharge flow, the water discharge will not be interrupted and the feeling of use will be excellent.

The specific example of the control of the water discharge based on the detection signal has been described above with reference to FIGS. 15 to 22. In the present embodiment, the detection signal may be obtained through a predetermined filter, or may be a signal obtained without going through a filter. When passing through a filter, for example, only a signal of 200 Hz or less can be used as a detection signal, or
Only a signal of several Hz or more can be used as a detection signal. Alternatively, these filters may be used in combination.

On the other hand, in this embodiment, determination can also be made based on the amplitude of the detection signal in a specific frequency band.
FIG. 23 is a graph illustrating the power spectrum of the detection signal, where (a) shows a state in which the water discharge flow is not disturbed (corresponding to the case of FIG. 6 (a)), and (b) shows that a person manually discharges water. (C) is a state where a cup is pooled (a state where the water discharge flow is disturbed: the figure) 6 (corresponding to the case of (c)).

When the maximum directivity direction of the radio wave of the sensor unit 100 is arranged so as to be substantially orthogonal to the flow (tangential direction) of the water discharge flow, as shown in FIG.
Detection signal only for undisturbed water discharge flow (water flow when only water is discharged from the water discharge section)
FIG. 23 (a)) and a detection signal (FIG. 23 (b)) of a spilled water flow disturbed by hand washing or a water reservoir.
) And (c)) can be clearly distinguished.

That is, in the power spectra of FIGS. 23A, 23B, and 23C, the frequency bands in which peaks appear are different. For example, the power spectrum of the detection signal of only the water discharge flow shown in FIG. 23A has the maximum peak in the frequency band of 20 Hz to 30 Hz. On the other hand, in the power spectrum of the detection signal at the time of hand washing (when water discharge hits a human hand) shown in FIG. 23B, there are a plurality of very large peaks in the frequency band of 0 to 30 Hz.
A peak is also formed in the frequency band of Hz to 50 Hz. This is caused by the spilled water hitting a hand or the like, and the flow is disturbed or scattered around. Further, as shown in FIG. 23 (c), in the power spectrum of the detection signal at the time of the water accumulation (when the water is accumulated in the cup), 0 is obtained.
It has a maximum peak in a frequency band of 10 Hz, and a power spectrum hardly appears in a frequency band of 30 Hz or higher. This is because the water calms down in the cup and moves slowly so that the peak disappears.

Continuation of water discharge and water stopping can be controlled using the difference in power spectrum of each state described above. That is, in a predetermined frequency band, a first threshold value that is larger than the amplitude of the detection signal when only water is discharged, and a second threshold value that is smaller than the amplitude of the detection signal when only water is discharged, Set. For example, when the amplitude of the detection signal in the frequency band of 40 to 50 Hz exceeds a predetermined threshold value (first threshold value), as shown in FIG. It can be judged that the water is discharged. When the amplitude of the detection signal in the frequency band of 20 to 30 Hz is below a predetermined threshold (second threshold), FIG.
As shown in the above, it is determined that the water reservoir is being executed by a cup or the like, and the water discharge can be continued.

When the amplitude of the detection signal in the frequency band of 20 to 30 Hz exceeds a predetermined threshold (second threshold) and the amplitude of the detection signal in the frequency band of 40 to 50 Hz is lower than the predetermined threshold (first threshold) On the other hand, as shown in FIG. 23 (a), it can be determined that the detection signal of only the water discharge flow is obtained, and the water can be stopped.

Note that the power spectra shown in FIGS. 23A, 23B, and 23C are merely examples, and only the discharged water flow, or the human flow hits the discharged water flow, or the water is stored in a cup or the like. When the present invention is applied, the power spectrum can be set as appropriate. Further, the number of frequency bands in which the threshold value of the detection signal is provided for continuation of water discharge or water stoppage is not limited to only one or two, but threshold values are provided for three or more frequency bands, respectively. The continuation of water discharge or the determination of water stoppage may be made based on the above.

Furthermore, as will be described in detail later, for example, the determination can be made based on the amplitude of the detection signal in a frequency band of several Hz to 100 Hz. For example, in the specific examples shown in FIGS. 7A to 7C, the amplitude of the detection signal in the frequency band of 10 Hz to 200 Hz is the highest in the state where the water discharge is in hand (FIG. 23B). When it ’s big and just discharging water (FIG. 23 (
a)) is smaller than that, and in the state where water is stored in the cup (FIG. 23 (c)),
The smallest. Therefore, it is possible to control the water stoppage based on the relationship between the amplitude of the detection signal and the predetermined threshold value.

In this embodiment, as a procedure for comparing the detection signal with a predetermined threshold value and determining whether or not it is only water discharge, one specific frequency band (divided frequency band) in the entire frequency band of the detection signal
It is also possible to determine whether or not the signal component is a detection signal only for the discharged water flow by comparing the signal component with a predetermined threshold value. As a frequency band for this comparison, a band in which the difference between the case of only the water discharge flow and the case of using the water discharge becomes significant.

FIG. 24 is a graph showing the power spectrum of the detection signal for explaining the procedure of comparison of the detection signal and determination of water stop in the present embodiment, (a) is the detection signal in the case of only the water discharge flow, ( b) represents the power spectrum of the detection signal when the water discharge hits the hand (when the water discharge is in use).

In FIG. 24, a frequency band of 60 Hz to 70 Hz is set as a specific frequency band to be compared. That is, the control unit 200 compares only the frequency band components of 60 Hz to 70 Hz of the acquired detection signal in the comparison procedure between the amplitude of the detection signal and the predetermined threshold value. In the frequency band of 60 Hz to 70 Hz, the power spectrum hardly appears in the case of only the discharged water flow, but a relatively large power spectrum appears when the discharged water hits the hand, and the difference is remarkable.

In the frequency band of 60 Hz to 70 Hz, it has been found that the power spectrum of the detection signal when the water discharge hits the hand is larger than that of the case of only the water discharge flow. For this reason,
The procedure for determining whether or not to stop water by the control unit 200 is as follows, for example.

One threshold value (first threshold value) is set in advance for the detection signal in the case of only the water discharge flow, and the amplitude of the detection signal of the frequency band component of 60 Hz to 70 Hz of the acquired detection signal is compared with the above threshold value. If the threshold value is exceeded, it is determined that the water discharge is a detection signal in use (not a detection signal for only the water discharge flow), and if it is equal to or less than the threshold value, it is determined that the detection signal is only for the water discharge flow. To do.

Alternatively, the integrated value of the power spectrum (or voltage) of the frequency band component of 60 Hz to 70 Hz of the acquired detection signal may be calculated, and this integrated value may be compared with a preset threshold value.

Alternatively, the values of a plurality of maximum points of the power spectrum (or voltage) of the frequency band component of 60 Hz to 70 Hz of the acquired detection signal may be added, and the added value may be compared with a preset threshold value.

Further, the above threshold value may be corrected as necessary in addition to using a fixed value. As a procedure for threshold correction, for example, a threshold correction operation mode is provided in the control unit 200, a detection signal for only the water discharge flow is acquired a plurality of times, and an appropriate value is determined according to the measured values of the frequency band components of 60 Hz to 70 Hz. The threshold value is corrected to a correct value.

FIG. 25 is a graph showing the power spectrum of the detection signal for explaining the procedure of comparison of the detection signal and determination of water stop in the present embodiment, (a) is a detection signal in the case of only the water discharge flow, ( b) represents the power spectrum of the detection signal when the water reservoir is in the cup (when water discharge is in use).

In FIG. 25, a frequency band of 20 Hz to 30 Hz is set as a specific frequency band to be compared. At 20 Hz to 30 Hz, the power spectrum appears when only the water discharge is flowing, but when the water is stored in the cup, the power spectrum hardly appears and the difference is remarkable.

Therefore, the procedure of the water stop determination by the control unit 200 for the frequency band of 20 Hz to 30 Hz is, for example, as follows as in the case of FIG.
One threshold value (second threshold value) is set for the detection signal in the case of only the water discharge flow, and the amplitude (or integrated value or a plurality of maximum points) of the frequency band component of 20 Hz to 30 Hz of the acquired detection signal is set. (The sum of the values of) is compared with the above threshold, and if it exceeds the above threshold,
If it is determined that the detected signal is only the discharged water flow, and if it is equal to or less than the above threshold value, it is determined that the discharged signal is a detection signal in use (not a detected signal only for the discharged water flow).

By doing this, by comparing the detection signal with the above threshold only in one frequency band (divided frequency band) where the difference between the case of only the water discharge flow and the case of using the water discharge becomes significant,
Since it is not necessary to compare the entire frequency band of the detection signal, the calculation processing time in the control unit 200 can be shortened, and the load on the memory can be reduced. The frequency bandwidth to be compared is not limited to the above 10 Hz, and can be set to a desired width.

On the other hand, in the present embodiment, as a procedure for comparing the detection signal with a predetermined threshold value and determining whether or not it is only water discharge, signal components in two specific frequency bands in the entire frequency band of the detection signal By comparing with a predetermined threshold value, it is also possible to determine whether or not the detection signal is only water discharge. For the two frequency bands to be compared, for example, as in the specific example described above with reference to FIGS. 24 and 25, a band in which the difference between the case of only the water discharge flow and the case of using the water discharge is significant.

FIG. 26 is a diagram illustrating a power spectrum of a detection signal for explaining a procedure of detection signal comparison and water stoppage determination in this specific example, where (a) is a detection signal in the case of only water discharge flow, (b)
) Represents the power spectrum of the detection signal when water is falling on the hand (when water is being used).

In FIG. 26, as a specific frequency band to be compared, a frequency band of 60 Hz to 70 Hz,
Two frequency bands of 20 Hz to 30 Hz are set. That is, the control unit 200 determines whether the detected signal is 60 Hz to 70 H in the detection signal comparison procedure (step S <b> 1 in FIG. 8).
Only the frequency band component of z and the frequency band component of 20 Hz to 30 Hz are compared.
In the frequency band of 60 Hz to 70 Hz, in the case of only the discharged water flow, the power spectrum hardly appears, but when the discharged water hits the hand, the power spectrum appears. Also, 20Hz-3
In the frequency band of 0 Hz, a power spectrum appears even when only the discharged water flow is present, but when the discharged water hits the hand, an extremely large power spectrum appears, and a large value is obtained as a difference value between the two detection signals.

As a comparison determination procedure by the control unit 200, for example, two threshold values (first threshold value for the frequency band of 60 Hz to 70 Hz, and 20H) for the detection signal in the case of only the water discharge flow
The first threshold for the frequency band of z to 30 Hz) is set in advance, and the amplitude of the detection signal of the frequency band component of 60 Hz to 70 Hz of the acquired detection signal is compared with the first threshold, and the acquired detection The amplitude of the detection signal of the frequency band component of 20 Hz to 30 Hz of the signal is compared with the first threshold value.

For example, if the amplitude exceeds the first threshold in the frequency band of 60 Hz to 70 Hz and the amplitude exceeds the first threshold in the frequency band of 20 to 30 Hz, the detection signal that is using the water discharge is used. It is determined that it is present (not a detection signal for only the water discharge flow). On the other hand, 60Hz
If the amplitude is equal to or lower than the first threshold in the frequency band of ˜70 Hz and the amplitude is equal to or lower than the first threshold in the frequency band of 20 to 30 Hz, it is determined that the detection signal is only the discharged water flow. Thereby, in the frequency band of 60 Hz to 70 Hz and the frequency band of 20 Hz to 30 Hz, the determination is made based on the first threshold value, but it is 2 rather than the determination in one frequency band.
It is more accurate to judge in one frequency band. For each frequency band component of the acquired detection signal, an integrated value of the power spectrum (or voltage) or a value obtained by adding a plurality of local maximum values may be used.

FIG. 27 is a graph showing the power spectrum of the detection signal for explaining the procedure of comparison of the detection signal and determination of water stop in this embodiment, (a) is a detection signal in the case of only the water discharge flow, ( b) represents the power spectrum of the detection signal when the water reservoir is in the cup (when water discharge is in use).

In FIG. 27, as a specific frequency band to be compared, a frequency band of 20 Hz to 30 Hz,
Two frequency bands of 0 to 10 Hz are set. In the case of 20 Hz to 30 Hz, the power spectrum appears in the case of only the water discharge flow, but the power spectrum hardly appears when the water is stored in the cup. In addition, in the frequency band of 0 to 10 Hz, a power spectrum appears even when only the water discharge is flowing, but an extremely large power spectrum appears when the water is stored in the cup, and the difference between both detection signals (or both integral values). A large value is obtained as a value.

The comparison determination procedure by the control unit 200 is the same as that in FIG. 26, for example. Two threshold values (second for the frequency band of 20 Hz to 30 Hz) for the detection signal in the case of only the water discharge flow
And the first threshold value for the frequency band of 0 to 10 Hz) are set in advance, and the detection signal of the frequency band component of 20 Hz to 30 Hz of the acquired detection signal is compared with the second threshold value and acquired. The detected signal of the frequency band component of 0 to 10 Hz of the detected signal is compared with the first threshold value.

For example, if the amplitude of the detection signal is less than the second threshold in the frequency band of 20 Hz to 30 Hz, or if the amplitude of the detection signal exceeds the first threshold in the frequency band of 0 to 10 Hz, water discharge is performed. It is determined that the detection signal is in use (not the detection signal of only the water discharge flow). In addition, if the amplitude of the detection signal is equal to or higher than the second threshold in the frequency band of 20 Hz to 30 Hz and the amplitude of the detection signal is equal to or lower than the first threshold in the frequency band of 0 to 10 Hz, the detection signal of only the discharged water flow. It is determined that

As described above, depending on the frequency band, the amplitude of the detection signal when the water is stored in the cup may be larger than the amplitude of the detection signal of only the water discharge flow. That is, when the frequency is not limited to a specific frequency band (see FIG. 7), the amplitude of the detection signal only when the water discharge is detected is the amplitude of the detection signal when the water is stored in the cup. Is bigger than
In the case of limiting to a specific frequency band through a filter, the amplitude of the detection signal when the water is pooled in the cup may be larger than the amplitude of the detection signal of only the water discharge flow. This will be described with reference to FIG.

FIG. 28 is a graph illustrating the level of the detection signal obtained from the sensor unit 100 in the frequency band of 0 Hz to 10 Hz. That is, the vertical axis in the figure represents the voltage value of the detection signal obtained from the sensor unit 100, and the horizontal axis represents time.
When limited to the frequency band of 0 Hz to 10 Hz through the filter, as shown in FIG. 23A, the peak of the power spectrum of the detection signal of only the water discharge flow is about 0.2.
On the other hand, the peak of the power spectrum of the detection signal when water is stored in the cup is shown in FIG.
As shown in c), it exceeds 0.35. As described with reference to FIG. 7, this is because the water settles in the cup and moves so that the water slowly shakes. Contains a lot of lower frequency band components than sometimes,
The peaks appear to be large.

Thereby, if limited to the frequency band of 0 Hz to 10 Hz, as shown in FIG. 28, the amplitude of the detection signal of only the discharged water flow does not exceed the first threshold value, but the cup is pooled. Sometimes the amplitude of the detection signal may exceed the first threshold. That is, there is a case where the magnitude relationship between the amplitude of the detection signal for only the discharged water flow shown in FIG. 7 and the amplitude of the detection signal for the cup water reservoir shown in FIG.

However, when not limiting to a specific frequency band without passing through a filter, and even when passing through a filter, for example, when looking at the entire frequency band of 0 Hz to 100 Hz,
The amplitude of the detection signal of only the water discharge flow is larger than the amplitude of the detection signal when the water is stored in the cup.

In this way, by comparing in two frequency bands where the difference between the case of only water discharge and the case of using water discharge is significant, the difference between when using water discharge and when not using water discharge It becomes clearer and more accurate judgment can be made. Note that the number of frequency bands to be compared is not limited to two, and a plurality of three or more frequency bands can be set.

In the present embodiment, for example, a method of extracting a signal in a specific frequency band from a detection signal acquired from the sensor unit 100 through a filter and determining the state of the discharged water flow based on the signal, and the sensor unit 100 It is also possible to combine the method for determining the state of the discharged water flow by comparing the detection signal acquired from the above with a predetermined threshold without using a filter. More specifically,
In the high frequency band where the difference in the detection signal acquired from the sensor unit 100 appears greatly, the state of the discharged water flow is determined by comparison with a predetermined threshold without using a filter, while the difference in the detection signal acquired from the sensor unit 100 In a low-frequency band where the signal appears to be small, a method of taking out a signal of a specific frequency band through a filter and determining the state of the discharged water flow based on the signal can be mentioned.

In this way, a method of determining through a filter, a method of determining without using a filter,
By combining these, it is possible to combine a state in which water stop control is desired early and a state in which a clear difference is desired in the detection signal. In other words, in the high frequency band where the difference in the detection signal appears greatly, the determination is made without going through the filter, so it takes no time (calculation) through the filter, enabling fast signal processing, and fast water stop control. Can do. On the other hand, in the low frequency band where the difference in the detection signal appears small, the determination is made through the filter, so the state of the discharged water flow can be determined with higher accuracy.

FIG. 29 is a flowchart illustrating the procedure of water stop control by the control unit 200 in the present embodiment.
That is, in this specific example, when the detection signal of only the water discharge flow continues for a predetermined time, the water is stopped. The control unit 200 acquires a detection signal from the sensor unit 100 (step S1), and compares the acquired detection signal with a threshold value (see FIG. 13A) set based on the detection signal in the case of only water discharge (see FIG. 13A). Step S2). At this time, as described above with reference to FIGS. 1 to 28, the determination is made by comparing the amplitude of the detection signal with the first and second thresholds.

As a result, when it is determined that the detection signal is a detection signal only for water discharge (YES in step S3), whether or not a predetermined time has elapsed since it is determined that the detection signal is only for water discharge, For example, the determination is made with reference to a timer.

And if predetermined time has not passed (it is NO at Step S10), it will return to Step S1 and will acquire a detection signal again. On the other hand, if the predetermined time has elapsed (YES in step S10), the valve 250 is closed to stop water (step S4). In addition, when it determines with an acquisition detection signal being different from the detection signal only of water discharge (it is NO at step S3), after resetting a timer, it returns to step S1.

As described above, it is possible to more reliably prevent water from being stopped during the use of water discharge by stopping water when the detection signal of only the water discharge continues for a predetermined time. On the other hand, the fact that the detection signal of only the water discharge flow continues for a predetermined time is considered to be a case where the water discharge is actually performed after use and there is no user. By stopping the water in some cases, it is possible to prevent unnecessary water discharge from being continued when not in use.

Next, another specific example of the procedure of water stop control by the control unit 200 in the present embodiment will be described.
When the cup is left unattended when the cup is pooled, when the wash bowl is clogged and the water overflows, or when the water discharge continues to be disturbed due to a failure or breakage of the water discharge section, etc. Is different from the detection signal in the case of only the water discharge flow, but the detection signal of the same pattern may be continuously output from the sensor unit 100. In such a case, since the detection signal such as when the cup is left is different from the detection signal of only the water discharge flow, water discharge may be continued without stopping water. Therefore, in this specific example, even if the detection signal is different from the detection signal for only water discharge, if the detection signal of the same pattern continues for a predetermined time, the water is stopped.

FIG. 30 is a flowchart illustrating the procedure of water stop control by the control unit 200 in this specific example. The control unit 200 acquires a detection signal from the sensor unit 100 (step S1),
The acquired detection signal is compared with a threshold set based on the detection signal in the case of only water discharge (
Step S2). At this time, as described above with reference to FIGS.
The determination is made by comparison with the first and second threshold values.

When it is determined that the detection signal is a detection signal for only water discharge (YES in step S3),
The valve 250 is closed to stop water (step S4).
On the other hand, it is determined whether or not the detection signal is the same as the pattern of the previous detection signal (step S20).
If it is determined that they are the same (YES in step S20), it is determined by a timer, for example, whether a predetermined time has elapsed (step S21).

If the predetermined time has elapsed (YES in step S21), the valve 250 is closed to stop water (step S4), and if the predetermined time has not elapsed (N in step S21)
O) Returning to step S1, the detection signal is acquired again. If it is determined in step S21 that the current acquisition detection signal is different from the previous acquisition detection signal pattern (
In step S21, NO), after resetting the timer, the process returns to step S1.
As described above, according to the present specific example, if a detection signal different from the detection signal of only the water discharge flow continues for a predetermined time in the same pattern, it is possible to prevent useless water discharge from continuing by stopping water.

FIG. 31 is a schematic diagram illustrating another specific example of the water discharging device of the present embodiment.
The water faucet device of the present embodiment also includes a sensor unit 100, a control unit 200, a water discharge unit 30, and a water receiving unit 40.
The water receiving portion 40 has a water receiving surface 41 on which the water discharge flow 34 is landed. The water receiving unit 40 further includes a left side surface 42, a rear surface 43, a right side surface 44, and a front surface 45 provided around the water receiving surface 41. The discharged water stream 34 discharged from the water discharge port 32 lands in an oblique direction with respect to the water receiving surface 41 as indicated by an arrow (flow direction) 302. However, it is not restricted to this, For example, you may land in a substantially perpendicular direction with respect to the water receiving surface 41. FIG.

The sensor unit 100 is provided on the back side of the left side surface 42 of the water receiving unit 40. This sensor unit 1
00 radiates radio waves from the direction substantially orthogonal to the flow direction 302 of the water discharge flow 34 to the water discharge flow 34 as indicated by an arrow (maximum directivity direction) 300. The radiated radio wave is reflected by the spout 34, and the sensor unit 100 receives the reflected radio wave (reflected wave). Furthermore, the sensor unit 100 transmits this reflected wave to the control unit 200 as information on the detected object.

In addition, since the sensor part 100 is provided in the back side of the left side surface 42, the material of the water receiving part 40 consists of resin, for example so that the electromagnetic wave from the sensor part 100 may be easily radiated | emitted in the direction of the discharged water flow 34. It is preferable. Even if the material of the water receiving portion is made of metal or earthenware, it is preferable to provide a window portion or the like (not shown) at least in a portion covering the front surface of the sensor portion 100.

According to this specific example, it is easy to radiate radio waves from the sensor unit 100 in a direction orthogonal to the discharged water flow 34. For example, even when the water flow of the water discharge flow 34 discharged from the water discharge port 30 changes, it is possible to radiate radio waves in a direction orthogonal to the water discharge flow by radiating radio waves from the side. As a result, as described above with reference to FIGS.
The level of the detection signal in the state of only the water discharge flow (corresponding to FIG. 6A) can be suppressed, and the difference from the detection signal in the state in which the water discharge flow is disturbed by the hand or the like is increased to make detection more stable and reliable. Is possible.

The embodiments of the present invention have been described above with reference to the drawings. However, the present invention is not limited to these embodiments. Even if a person skilled in the art changes the design and configuration of the sensor unit, the detection signal comparison procedure in the control unit, and the water stoppage determination procedure, it is included in the scope of the present invention without departing from the gist of the present invention. Is done.

It is a schematic diagram showing the structure of the water discharging apparatus of the 1st Embodiment of this invention. 3 is a block diagram of a specific example of a sensor unit 100 and a control unit 200. FIG. 3 is a block diagram of a specific example of a sensor unit 100 and a control unit 200. FIG. It is a schematic diagram explaining angle (theta) which the maximum directivity direction of the electromagnetic wave of the sensor part 100 in the 1st Embodiment of this invention makes, and the tangential direction of a discharged water flow. It is a graph which shows the voltage characteristic of the frequency side component of the midrange of a detection signal with respect to angle (theta) which the tangent of the discharged water flow in the 1st Embodiment of this invention and the maximum directivity direction of the sensor part 100 form. It is a mimetic diagram showing the faucet device in the case of only the spouting in the embodiment of the present invention, and the case of using the spouting. FIG. 7 is a graph illustrating the level of a detection signal obtained from the sensor unit 100 in each case illustrated in FIGS. It is a flowchart which performs water stop control based on a 1st threshold value. It is a flowchart which controls water discharge based on a 2nd threshold value. It is a graph for demonstrating control of the water discharge which considered both the 1st threshold value and the 2nd threshold value. It is a graph for demonstrating another specific example of the control of the discharge water in consideration of both the 1st threshold value and the 2nd threshold value. It is a schematic diagram for demonstrating the relationship between a detection signal and a threshold value. It is a schematic diagram which illustrates the specific example of a detection signal. In the specific examples shown in FIGS. 13A to 13C, the detection signals are folded around the reference value, and the reference value is corrected to near zero. It is a graph for demonstrating the 1st specific example of control of the spitting water based on a detection signal. It is a graph for demonstrating the 2nd specific example of control of the spitting water based on a detection signal. It is a graph for demonstrating the 3rd specific example of control of the spitting water based on a detection signal. It is a graph for demonstrating the 4th specific example of control of the spitting water based on a detection signal. It is a graph for demonstrating the 5th specific example of the control of the discharge water based on a detection signal. It is a graph for demonstrating the 6th specific example of control of the spitting water based on a detection signal. It is a graph for demonstrating the 7th specific example of control of the spitting water based on a detection signal. It is a graph for demonstrating the 8th specific example of control of the spitting water based on a detection signal. It is a graph showing the power spectrum of the detection signal in this embodiment. It is a graph which shows the power spectrum of the detection signal for demonstrating the procedure of the comparison of the detection signal in this embodiment, and a water stop determination. It is a graph which shows the power spectrum of the detection signal for demonstrating the procedure of the comparison of the detection signal in this embodiment, and a water stop determination. It is a graph which shows the power spectrum of the detection signal for demonstrating the procedure of the comparison of the detection signal in this embodiment, and a water stop determination. It is a figure which shows the power spectrum of the detection signal for demonstrating the procedure of the comparison of the detection signal in this embodiment, and a water stop determination. It is a graph which illustrates the level of the detection signal obtained from the sensor part 100 in the frequency band of 0 Hz to 10 Hz. It is a flowchart explaining the procedure of the water stop control by the control part 200 in this embodiment. It is a flowchart explaining the procedure of the water stop control by the control part 200 in this embodiment. It is a schematic diagram showing the other specific example of the water discharging apparatus of this embodiment.

Explanation of symbols

10 water supply hose, 30 water outlet, 40 water receiving part, 100 sensor part, 112, 112a
, 112b antenna, 114 transmitting unit, 116 receiving unit, 118 mixer unit, 200 control unit, 210 filter, 220 frequency detection unit, 230 determination unit, 240 storage means, 25
0 valve

Claims (1)

A water discharge part,
A radio wave is emitted to the detected object, a reflected wave of the emitted radio wave is received, information on the movement of the detected object is acquired , and a detection signal having a predetermined intensity and frequency is output based on the information A Doppler sensor unit;
A control unit for controlling the ejection stop water from the water discharge unit based on a detection signal from the sensor unit,
Storage means for storing a predetermined threshold ;
With
The sensor unit is arranged such that at least a part of the radio wave radiated from the sensor unit hits a water discharge flow discharged from the water discharge unit,
The control unit determines the state of the water discharge flow based on the intensity in the first frequency band of the detection signal output from the sensor unit and the intensity in the second frequency band lower than the first frequency band. Determining, controlling the water discharge from the water discharge unit , first, if the intensity in the first frequency band is greater than the first threshold, water discharge is continued, second, When the intensity in the second frequency band is smaller than the second threshold, water discharge is continued, and third, the intensity in the first frequency band is smaller than the first threshold, and the second If the intensity in the frequency band is greater than the second threshold,
The first threshold value and the second threshold value are determined based on the intensity of the detection signal in a state where no object is put in the water discharge flow discharged from the water discharge unit. .

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