JP5594643B2 - System kitchen - Google Patents

Description

The present invention relates to a system kitchen that opens and closes a valve that supplies water to a water discharge port based on a received signal of a sensor that radiates radio waves. The present invention relates to a system kitchen that maintains the open state of a valve by detecting the presence or absence of a scattering state.

When the transmission wave from the sensor hits the detected object, a reflected wave is generated. Since a detected object such as a human body can be detected by receiving this reflected wave, a technique is known that uses this as a detection means for automatic control of water discharge of the faucet device.

For example, a system kitchen is described in which a photoelectric switch is provided on the side wall surface of the sink and a hand or tableware is brought close to the faucet to operate the switch to discharge water. (Patent Document 1)

In addition, an optical switch is provided in the housing, and the presence or absence of operation of the water supply mechanism, switching between hot water supply and hot air supply, and the mixing of soap liquid during hot water supply as the hand enters and leaves the housing opening. A hot water / hot air supply device that operates intermittently is disclosed. (Patent Document 2)

As in Patent Document 1, the photoelectric sensor arranged on the sink side wall detects a hand or tableware approaching the faucet and discharges water. Further, as in Patent Document 2, let's automatically control water stoppage by taking in and out the object to be detected. If, for example, hand scrubbing is performed within the detection range of the photoelectric sensor during water discharge, the user continues to discharge water while the valve is open even though the water is not being discharged. And wasteful water may be generated.

As a means to solve such problems, a radio wave sensor is used to distinguish between water discharged when the washed water does not hit the washed water flow and water scattered when the discharged water hits the washed material during the cleaning operation. Technology is known. (Patent Document 3)

If the technique of patent document 3 is utilized, even when an action such as hand scrubbing is performed within the detection range of the sensor, there is no water splashing on the hand, so the water can be stopped.
However, in kitchen work, the work of drawing the discharged water into a pan or the like frequently occurs. In the operation of drawing water, there is no problem that water splashing on the cleaning object is generated, so that even if the technique of Patent Document 3 is used, the water stops.

Japanese Utility Model Sho 61-075570 Reality 2-33940 Japanese Patent Application No. 2007-250831

The present invention has been made to solve the above problems, and an object of the present invention is to provide a system kitchen that opens and closes a valve for supplying water to a water discharge port based on a received signal of a sensor that radiates radio waves. In the valve open state, it is identified whether an object other than water existing in the sink is stationary or non-stationary, and whether the discharged water hits the object or is scattered It is to provide a system kitchen that is easy to use for the user by more accurately determining the user's situation of pumping water and ensuring that water discharge continues.

According to one aspect of the present invention for achieving the above object, a faucet having a spout, a sink that receives water discharged from the spout, a radio wave is transmitted and received, and the object to be detected is stationary. A sensor unit that detects a moving state or a moving state, and a valve that opens and closes based on detection information of the detected object obtained from the sensor unit and switches whether or not to supply water to the water outlet. The sensor unit includes a signal processing unit that can identify an object other than water and water and a water scattering state, and the sensor unit is in a stationary state. In addition, it is possible to provide a system kitchen characterized in that the open state of the valve is maintained when it is detected for a predetermined time that the water scattering state is a predetermined level or less. By detecting both the stationary and non-water splashing of objects other than water, the object is stationary and the water splashing is small, the water is not present or non-stationary, and the water splashes. Since it is possible to reliably determine the state of small non-use, it is possible to continue water discharge when drawing water, providing a user-friendly system kitchen that can be used without stress for the user. I can do it.

Moreover, according to one aspect of the present invention, the signal processing unit identifies an object other than water from water based on frequency information of a detection signal obtained from the sensor unit. The system kitchen according to Item 1 can be provided. The general speed of an object other than water is about 50 Hz, which is relatively low compared to the speed of water (about 100 Hz), so there is a difference in frequency information. Therefore, by acquiring the speed information of the detected object, it becomes possible to identify water and an object other than water more accurately, and it is possible to provide a user-friendly system kitchen.

The signal processing unit includes at least two filters, a first filter that passes a DC signal for detecting a stationary state of an object, a second filter that blocks a DC signal for detecting a scattering state of water, and the like. The system kitchen according to claim 1, wherein a maximum pass frequency of the second filter is larger than a maximum pass frequency of the first filter. Since 0 Hz (DC component) is obtained when the object is in a stationary state, it is possible to accurately distinguish between a stationary state that is difficult to identify and a substantially stationary state by using the first filter. Since the water does not enter a stationary state when the water is in a scattered state, it is possible to detect the scattered state of the water more accurately without being affected by disturbance by using a second filter that blocks unnecessary DC signals. Furthermore, since the speed in the state of water scattering is relatively higher than the speed of objects other than water, setting the maximum pass frequency of the second filter higher than the first makes the objects other than water stationary. It is possible to detect the state and water splashing on an object other than water with higher accuracy, and it is possible to perform water discharge continuation control with higher accuracy.

Further, according to one aspect of the present invention, the signal processing unit is configured to identify the state of water during a washing operation, the state of non-use water, and the state of water during a water drawing operation. The signal having passed through the second filter has at least two first and second threshold values different from each other, and if the first threshold value is exceeded for a predetermined time, the state of the water being washed When the second threshold value is exceeded for a predetermined time, it is detected that the water is not in use, and when the second threshold value is not exceeded for a predetermined time, a pot or the like is used. The system kitchen according to claim 3, wherein the system kitchen is detected as being in a state of water accumulated in the water, and the first threshold value is larger than the second threshold value. Compared to the non-use state in which the water splash direction is relatively large because the direction of water scattering spreads during washing operations that hit objects other than the sink, so that the signal strength is relatively large, and the water splashes directly against the sink. Signal strength is low. In addition, when the water is drawn in a state where water accumulates in a container such as a pot, the signal becomes the smallest due to less scattering of water. Therefore, by controlling with the threshold value in the second filter, it is possible to reliably determine the state of water. Thereby, automatic water stop control and water discharge continuation control with higher accuracy are possible.

According to the aspect of the invention, the signal processing unit may or may not include a stationary object other than water in the sink based on the signal intensity that has passed through the first filter within a predetermined time. The system kitchen according to any one of claims 3 and 4 can be provided. When there is no object other than water in the sink, the signal strength of the first filter does not change or is extremely small, but if there is a stationary object other than water in the sink, the first filter depends on the installation location. Since the signal strength of the filter fluctuates by a certain level, it is possible to reliably determine whether a stationary object other than water is present in the sink by setting the threshold and detection time in the first filter. Become. As a result, when there is no stationary object other than water in the sink, it is possible to reduce the possibility that an object other than water will be mistakenly detected to be stationary, and water discharge will continue. This makes it possible to provide a more convenient system kitchen.

According to the present invention, by determining the stationary state of an object other than water placed in the sink and the water splashed upon the object to be washed, the water discharge is continued during the operation of drawing water. This makes it possible to provide an easy-to-use system kitchen where the user can perform kitchen work without stress.

Schematic configuration diagram of the system kitchen of the present invention Sensor block diagram Schematic of Doppler frequency signal Illustration when the hand moves in the sink Explanatory drawing when hand washing work in the sink is performed Explanatory drawing in which objects other than water are placed in the sink and water is being drawn Explanatory diagram of how to stop water by detecting the stationary state of objects other than water and the state without splashed water Schematic diagram of detection signal when objects other than water are stationary Schematic diagram of the signal when water drops adhere to the sink wall Illustration of stationary object detection method Schematic diagram of Doppler frequency signal of reflected wave due to splashed water Schematic diagram of the signal when water drops adhere to the sink wall Detailed explanation of sensor Schematic diagram of frequency characteristics of water in hand movement and scattered state Explanatory drawing of filter circuit for detecting hand Explanatory drawing of filter circuit for detecting water

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a schematic configuration diagram of the system kitchen of the present invention. The system kitchen 1 includes a faucet 10 having a spout 11, a sink 20 that receives a spout 12 discharged from the spout 11, a water supply pipe 30 for supplying water to the faucet 10, and transmission and reception of radio waves. And a valve 40 that opens and closes based on detection information of the detected object obtained from the sensor unit 50 and switches whether or not to supply water to the water outlet 11. The sensor unit 50 is provided outside the sink side wall 21 and is configured to have a detection area 51 inside the sink 20.

First, the direction relationship of the sink 20 in this embodiment will be described. In FIG. 1, a place where the user uses the sink 20, for example, in this embodiment, the surface facing the faucet 10 is the front edge side, the surface facing the front edge side is the rear edge side, and the sink opening surface direction is The upper direction, the direction in which the sink bottom surface exists, is the lower side, the left side of the drawing is the left side, and the right side of the drawing is the right side. A sink is comprised by the side wall and bottom face which exist in the front edge side, the rear edge side, the left side, and the right side.

Note that the boundary between the sink side wall 21 and the bottom surface 22 provided in each direction is not necessarily clear. For example, the connection surface between the side wall surfaces 21 may be formed as a curved surface. Further, the sink bottom surface 22 and the sink side wall 21 may be formed at an identifiable angle or shape. Furthermore, the sink bottom surface 22 is not limited to the one formed in a horizontal plane, and may be formed with an inclination. Further, the sink side walls 21 may all change in the same depth direction according to the shapes of the sink bottom surface 22 and the entire sink without having the same length. Here, the sink 20 becomes a recess with respect to the counter upper surface 60 as shown in FIG. 1 and receives water discharged from the water outlet 11.

Moreover, the discharged water flow 12 does not need to be a shower shape like FIG. 1, and shapes, such as a rectification | straightening, a spray, and a waterfall shape, may be sufficient.

In FIG. 1, the faucet 10 is installed on the counter upper surface 60, but the faucet 10 may be installed on the sink side wall surface 21. The shape of the faucet 10 is not limited to that shown in FIG.

In the present invention, the water discharged from the water outlet 11 may be the above liquid because hot water, hot water, soapy water or the like exhibits the same effect.

Details of the sensor unit 50 are shown in FIG. The sensor unit 50 receives a reception wave 59 in which a transmission wave 58 radiated to the outside is reflected back to the detection object, and generates a determination signal 56 based on the reception signal 55; And a control unit 53 that transmits an open / close signal 57 to the valve 40 based on the determination signal 56 output from the signal processing unit 52. The signal processing unit 52 may be omitted. In that case, the control unit 53 may transmit an open / close signal 57 to the valve 40 based on the received wave 59. By omitting the signal processing unit 52, it is possible to reduce time loss and the number of parts related to signal processing.

As shown in FIG. 4, when there is an operation such as hand scuffing in the sink 20 during water discharge from the water outlet 11, for example, when an infrared sensor is used for the sensor unit 50, water is discharged in response to the hand 150 that is a detection target. There is a possibility of continuing. Thereby, useless water discharge continuation which the user does not intend may occur.

As a means for solving the problem, for example, as shown in FIG. 5, by detecting the scattered water 13 generated when the discharged water hits the object to be cleaned, the water stop control is performed when the scattered water 13 is not detected. Continuation of useless water discharge unintended by the person can be prevented.

However, for example, as shown in FIG. 6, in the kitchen work, the user places a cooking utensil 150 such as a pot near the landing position of the water discharge flow 12 in the sink 20 from the water outlet 11 into the water discharged, and discharges the inside of the pot 150. There is a case where the water drawing operation is performed such that the water flow 12 is landed. In such a scene, it is considered that the user intends to continue water discharge. However, for example, when a method of detecting scattered water is applied, the scattered water 13 is not detected, so the water stops, There is a possibility of hindering the drawing work.

As a means for solving the problem, there is a method in which not only the detection of the scattered water 13 but also means for detecting the stationary state of an object other than water as shown in FIG. In the water drawing operation, the scattered water 13 is not detected, and the stationary state of the cooking utensil 150 that draws water is detected. For example, even when the scattered water 13 is not detected, water discharge is continued by detecting the stationary state of the object. Therefore, the user can perform kitchen work without stress, and can provide a user-friendly system kitchen.

Therefore, according to one aspect of the present invention, the faucet 10 having the water outlet 11, the sink 20 that receives water discharged from the water outlet 11, and the object to be detected are stationary by transmitting and receiving radio waves. A sensor unit 50 that detects a state or a moving state, and a valve 40 that opens and closes based on detection information of the detection object obtained from the sensor unit 50 and switches whether or not to supply water to the water outlet. The sensor unit 50 includes a signal processing unit 52 that can identify an object other than water and water and a water scattering state, and the sensor unit 50 is open when the valve 40 is in an open state. 50, when the object 150 other than water is in a stationary state and it is detected for a predetermined time that the water 13 scattered in the sink 20 is at a predetermined level or less, the valve 40 is kept open. By detecting both the stationary and non-water splashing of objects other than water, the object is stationary and the water splashing is small, the water is not present or non-stationary, and the water splashes. Since it is possible to reliably determine a small non-use state, it becomes possible to continue water discharge when drawing water, and the user can perform kitchen work without stress and can provide an easy-to-use system kitchen.

A means for discriminating between water and an object other than water by the sensor unit 50 will be described. When performing the identification, it is desirable to use a Doppler frequency signal of a radio wave sensor. When an infrared sensor is used, it is easy to identify the presence or absence of an object to be detected, but it is difficult to identify what the non-detected object is. On the other hand, by using the Doppler frequency signal of the radio wave sensor, it is possible to acquire speed information of the detected object, and it is possible to identify the detected object using speed characteristics. In particular, when referring to identification of water and other than water, objects other than water in the sink as shown in FIG. 14 are mainly hands, ingredients, tableware, and cooking utensils, and the speed characteristics are included in hand movements. . On the other hand, speed information that is faster than the movement of the hand can be obtained for the scattered water. Specifically, the speed of the hand is generally around 50 Hz, and the speed of the scattered water is generally around 100 Hz.

As a configuration for realizing these detection means, according to one aspect of the present invention, in the system kitchen of claim 1, the signal processing unit 52 can obtain from the sensor unit 50 discrimination between an object other than water and water. It is identified by the frequency information of the detection signal. The general speed of an object other than water is about 50 Hz, which is relatively low compared to the speed of water (about 100 Hz), so there is a difference in frequency information. Therefore, it becomes possible to identify more accurately, and it is possible to provide an easy-to-use system kitchen.

  A means for discriminating the stationary state and non-stationary state of an object other than water by the sensor unit 50 will be described. In order to identify and detect the stationary object and the moving object, it is necessary to acquire velocity information of the object. For this purpose, it is desired to use the Doppler frequency signal of the radio wave sensor. For example, the signal reflected from the water being sprinkled, or the signal reflected from a washing object other than water, such as the hand performing the washing operation, is because the washing object that is the object to be detected has a velocity component. As shown in FIG. 3, the voltage change 202 with respect to the reference value 200 of the Doppler frequency signal is obtained as a relatively large value with respect to the state where the cleaning object is not present. On the other hand, when the cleaning object 150 such as a pan is placed in the detection area 51 of the sensor as shown in FIG. 6, the cleaning object does not have a speed component, so that the voltage of the Doppler frequency signal as shown in FIG. The change amount 201 of the detection signal with respect to the reference value 200 is almost zero. Using the characteristics of the Doppler frequency signal, the washing object is distinguished from a stationary state and a non-stationary state. For example, a 10 GHz band is used for the frequency of the radio wave to be transmitted.

The stationary state in the present invention represents a state having no velocity component, and corresponds to, for example, a pan placed in a sink. The state in which the hand or an object held by the hand is held over is not included in the stationary state because it includes a very low speed component due to shaking of the hand.

For an algorithm for detecting an object other than water in a stationary state, for example, the maximum value or integrated value of the absolute value of the difference with respect to the reference value 200 per unit time of the detection signal is measured and compared with an arbitrarily set threshold value. Thus, it may be determined whether the object 150 other than water is stationary.
Specifically, for example, as shown in FIG. 8, when predetermined thresholds 203 and 204 are set and the voltage 202 continues for a time 230 or more arbitrarily set to be a voltage smaller than 203 and larger than 204. It is determined that the object 150 other than water is stationary.

In order to more accurately determine whether an object other than water is stationary, for example, a digital filter or a filter circuit may be used to limit the frequency band used as the detection signal.
However, in order to detect a stationary state, it is necessary to distinguish between a substantially stationary state (approximately several Hz) that is close to a stationary state such as when a hand is held up and a stationary state. This is to distinguish between the stationary state of objects other than water in the sink when the water is being pumped and the approximately stationary state of objects other than water in the sink where the hand stays in the sink when the kitchen operation is interrupted. This is because the water is surely stopped when the hand stays. Therefore, a signal including at least 0 Hz or a frequency in the vicinity of 0 Hz may be used.

In the Doppler signal, the voltage value does not fluctuate both in a stationary state and when no object other than water is present in the sink. Therefore, it may be erroneously detected that the object is stationary even though the object does not exist in the sink, and water discharge may be continued.

As a means for solving the problem, a signal including a DC component (0 Hz) is used for the detection signal from the sensor unit 50. When the stationary state of the object 150 other than water is to be detected, for example, when the object 150 other than water stops in the vicinity of the sensor unit 50, the DC component fluctuates. On the other hand, when nothing exists in the vicinity of the sensor unit 50, the DC component does not fluctuate.

Therefore, for example, threshold values 205 and 206 are set as shown in FIG. 9, and the presence of the object 150 other than water can be detected by detecting that the threshold value 205 is exceeded for a predetermined time or is lower than the threshold value 206 for a predetermined time. Further, when the signal 150 is smaller than a predetermined threshold value 209 set with respect to a reference value 207 obtained from an average of signals within a predetermined time and larger than the threshold value 208, it is detected that the object 150 is stationary. I can do it. On the other hand, for example, when it is detected that the threshold value 205 is lower than the threshold value 205 and exceeds the threshold value 206 for a predetermined time period, and the threshold value 209 is smaller than the threshold value 209 and larger than the threshold value 208, the absence of the object 150 is detected. I can do it. As a result, it is possible to distinguish between the case where no object other than water is present near the sensor and the case where it is present and stationary. As a result, it is possible to prevent erroneous detection that the object 150 other than water is stationary when there is no object 150 other than water, and it is possible to perform automatic water stop control with higher accuracy. Can provide a good system kitchen.

As a configuration for realizing these detection means, in the system kitchen according to claim 3 or 4, the signal processing unit 52 is configured such that the signal other than water in the sink is based on the signal intensity that has passed through the first filter within a predetermined time. It is determined whether or not a stationary object exists. In the state where there is no object 150 other than water, the signal intensity of the first filter does not vary or is extremely small, but when there is a stationary object other than water in the sink, the first filter Since the signal intensity fluctuates by a certain level, it is possible to reliably determine whether a stationary object other than water is present in the sink by setting the threshold value and the detection time in the first filter. As a result, when there is no stationary object other than water in the sink, it is possible to reduce the possibility that the object 150 other than water will be erroneously detected to be stationary and continue to discharge water, and to stop with higher accuracy. By enabling water control, a more convenient system kitchen can be provided.

The non-stationary state refers to a case where the condition for detecting the stationary state is not met. In this embodiment, a method for detecting the stationary state is shown. A means for detecting both stationary states may be used.

A method for detecting the scattered water 13 by the sensor unit 50 will be described. Since the scattered water 13 has a velocity component, a frequency component higher than 0 Hz is included in the detection signal as indicated by 600 in FIG. Therefore, for example, as shown in FIG. 11, predetermined threshold values 601 and 602 are set, and whether or not the signal 600 of the splashed water 13 exceeds the threshold value 601 or falls below the threshold value 602 during the predetermined time 603. Sprinkling water can be detected by setting the number of times, the accumulated time exceeding the number, and the like as determination conditions.

However, when an attempt is made to detect the scattered water 13 using a signal including a direct current component (0 Hz) obtained from the sensor unit 50, water droplets on the sink side wall surface 21 due to water splashing during use of the discharged water flow 12. There is a possibility that an object that reflects radio waves adheres and a reflected object may appear in the detection range 51. At that time, the entire detection signal 600 varies with respect to 604 set as a reference value as shown in FIG. Therefore, even when the scattered water 13 does not exist, there is a possibility that the water is erroneously detected as having scattered water, and the detection accuracy is lowered. Therefore, it is desirable to use a signal obtained by blocking the 0 Hz signal as the signal for detecting the scattered water 13 to prevent the influence of water droplets or the like.

Here, the state where the scattered water 13 is not detected means a case where the condition for detecting the scattered water 13 is not met. In this embodiment, a method for detecting the scattered water 13 is shown. Means for detecting a state where no water is present, or means for detecting both of the state where the scattered water 13 and the scattered water 13 are not present may be used.

As a configuration for realizing these detection means, according to one aspect of the present invention, in the system kitchen according to claim 1 or 2, the signal processing unit 52 is configured to pass a DC signal for detecting the stationary state of the object. One filter and at least two filters of a second filter that cuts off a DC signal for detecting the state of water scattering, and the maximum pass frequency of the second filter is the maximum pass of the first filter Make it larger than the frequency. Since the stationary state of the object is 0 Hz (DC component), the stationary state that is difficult to identify and the substantially stationary state can be reliably identified by using the first filter. Since the scattered state of water does not include a stationary state, the scattered state of water can be reliably detected without being affected by disturbance by using a second filter that blocks unnecessary DC signals. Furthermore, since the speed of the water scattering state is relatively higher than the speed of the object other than water, the stationary state of the object other than water is set by setting the maximum pass frequency of the second filter higher than the first. In addition, it is possible to detect water splashing on an object other than water with higher accuracy, and it is possible to perform water discharge continuation control with higher accuracy.

As a configuration for realizing such detection means, for example, as shown in FIG. 13, the sensor unit 50 is provided with a filter function that divides a signal from the sensor 60 into a plurality of frequency bands between the sensor 60 and the valve 40. A control unit 53 that outputs an opening / closing signal to the valve 40 based on a signal from the signal processing unit 52 may be provided.

As a filter configuration for obtaining a signal including a DC signal in order to detect an object other than water, for example, there is a low-pass filter using a resistor 900 and a capacitor 901 as shown in FIG. Further, as a filter configuration for obtaining a signal that does not include a DC signal in order to detect water, for example, there is a high-pass filter using a resistor 903 and a capacitor 902 as shown in FIG. By configuring the filter on the electric circuit in this way, it becomes possible to acquire a signal with almost no time delay, and the judgment time of the signal processing unit can be further shortened, so that an easy-to-use system kitchen can be provided. .
Furthermore, arithmetic processing by a computer or digital filter processing may be used. As a result, it is possible to extract a frequency to be acquired with higher accuracy, and it is possible to perform water discharge continuation control with higher detection accuracy.

Furthermore, according to one aspect of the present invention, in the system kitchen according to claim 3, the signal processing unit 52 is configured such that the water state during the washing operation in which the signal processing unit 52 hits an object other than water and scatters, and the water directly enters the sink 20. In order to distinguish the state of non-use water that splashes and hits and the state of water that is being pumped into a container such as a pot, the signal that has passed through the second filter The first threshold value and the second threshold value are different from each other, and when the first threshold value is exceeded for a predetermined time, it is detected that the water splashes on the object to be cleaned, and the second threshold value is detected. When it exceeds a predetermined time, it is detected that the water directly hits the sink 20 and is scattered, and when the second threshold is not exceeded for a predetermined time, the water is stored in a container such as a pot. It has a configuration to detect, and One threshold is set to be larger than the second threshold value, even the state of water splashing against directly to the sink 20 it can be identified. The signal strength is relatively large during washing operations where the water splashes against objects other than the sink, and the signal strength is relatively small when the water is in a state of water splashing directly against the sink. Since the signal is the smallest during the operation of drawing water in a state where water is accumulated in a container such as a pot, it is possible to reliably determine by performing control with the threshold value in the second filter. Thereby, automatic water stop control and water discharge continuation control with higher accuracy are possible.

DESCRIPTION OF SYMBOLS 1 ... System kitchen 10 ... Water faucet 13 ... Splash water 11 ... Spout 20 ... Sink 21 ... Sink side wall 22 ... Bottom surface 40 ... Valve 50 ... Sensor part 52 ... Signal processing part 53 ... Control part 900 ... Resistance 901 ... Capacitor

Claims (5)

A faucet having a spout,
A sink for receiving water discharged from the water outlet;
A sensor unit that transmits and receives radio waves to detect whether the detected object is stationary or moving; and
A valve that opens and closes based on detection information of the detected object obtained from the sensor unit and switches whether or not to supply water to the water outlet;
A system kitchen having
The sensor unit includes a signal processing unit that can identify an object other than water and water, and a water scattering state,
When the valve is open,
The sensor unit is
When it is detected for a predetermined time that an object other than water is in a stationary state and the scattered state of water is below a predetermined level,
A system kitchen characterized in that the valve is kept open. The signal processing unit
Identifying water and non-water objects
By the frequency information of the detection signal obtained from the sensor unit,
The system kitchen according to claim 1, wherein the system kitchen is identified. The signal processing unit
A first filter for passing a DC signal for detecting a stationary state of an object, a second filter for blocking a DC signal for detecting a scattering state of water, and at least two filters. The maximum pass frequency of the filter is greater than the maximum pass frequency of the first filter,
The system kitchen as described in any one of Claim 1 or 2. The signal processing unit
In order to distinguish between the state of water during washing, the state of non-use water, and the state of water during pumping,
The signal having passed through the second filter has at least two first and second thresholds having different values,
When the first threshold value is exceeded for a predetermined time, it is detected that the water is being washed.
When the second threshold value is exceeded for a predetermined time, it is detected that the water is not in use,
When the second threshold value is not exceeded for a predetermined time, the state of water accumulated in a container such as a pot is detected,
Furthermore, the first threshold is larger than the second threshold,
The system kitchen according to claim 3. The signal processing unit
Based on the signal strength that passed through the first filter within a predetermined time,
Whether there is a stationary object other than water in the sink,
5. The system kitchen according to claim 3, wherein it is determined whether or not it exists.

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