KR20170077978A - Sensor system for cleaning toilet and method for automated cleaning of toilet - Google Patents

Abstract

The present invention relates to a sensor system for cleaning a toilet bowl and a toilet flushing method. The sensor system for cleaning a toilet bowl according to the present invention is connected between a water supply pipe to which washing water is supplied and a water discharge pipe to be connected to a drain hole of a toilet seat so as to selectively discharge the washing water flowing through the water supply pipe to the toilet water through the drain pipe A valve assembly; A sensor unit configured to detect a user located within a predetermined distance; A display unit configured to switch between a plurality of display states; A power monitoring unit configured to detect a power supply error to the infrared sensor; And a controller for controlling the valve assembly such that supply of rinse water to the drain pipe is interrupted when the power supply error is detected by the power monitoring unit, and a display state of the display unit is controlled based on the detection result by the sensor unit And a control unit configured. Thus, the cleaning cycle can be controlled automatically based on the sensor detection result, and the state of the cleaning cycle can be easily distinguished and displayed by the indicator.

Description

Technical Field [0001] The present invention relates to a sensor system for cleaning a toilet bowl and an automatic cleaning method for a toilet,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sensor system for cleaning a toilet bowl and an automatic cleaning method for a toilet. More particularly, the present invention relates to a sensor system for cleaning a toilet bowl and an automatic cleaning method for a toilet, which can automatically control a cleaning cycle based on a sensor detection result and can display each state of a cleaning cycle by an indicator.

Generally, a toilet flushing system means a system in which when a user operates a valve after using a toilet, predetermined cleansing water is discharged into the inside of the toilet to clean the toilet.

In the conventional toilet cleansing system, a water tank is disposed at a predetermined height from the upper part of the toilet and stores a predetermined amount of washing water capable of washing the inside of the toilet bowl. The water tank is connected to the water tub through a channel, And a discharge valve for discharging the washing water stored in the water tank to the inside of the toilet bowl. However, in this case, there was an inconvenience that the cleaning must be performed by the user's operation.

To alleviate this inconvenience, a technique for automatically controlling the supply of wash water has been developed. For example, Korean Patent Laid-Open Publication No. 2000-0063908 discloses a use detection sensor for detecting the presence or absence of a user using a toilet.

However, in the case of the technique disclosed in Japanese Patent Application Laid-Open No. 2000-0063908, the user can not recognize the state of the cleaning cycle by the sensor from the outside, and when the sensor detection and the manual operation of the user overlap, unnecessary repetitive washing There is a problem that can be done. In addition, the washing water may be wasted due to interruption of electric power supplied to the sensor, defective conductor, malfunction of the sensor, or inaccurate sensor detection distance.

Korean Patent Publication No. 2000-0063908

Therefore, it is an object of the present invention to provide a sensor system for cleaning a toilet bowl and an automatic cleaning method for a toilet, which can automatically control a cleaning cycle based on a sensor detection result and can clearly display each state of a cleaning cycle by an indicator The purpose is to provide.

The object of the present invention is achieved by a valve assembly comprising: a valve assembly connected between a water supply pipe to which washing water is supplied and a drain pipe to be connected to a drain hole of a toilet seat, and to selectively discharge washing water flowing through the water supply pipe to the toilet through the drain pipe; A sensor unit configured to detect a user located within a predetermined distance; A display unit configured to switch between a plurality of display states; A power monitoring unit configured to detect a power supply error to the infrared sensor; And a controller for controlling the valve assembly such that supply of rinse water to the drain pipe is interrupted when the power supply error is detected by the power monitoring unit, and a display state of the display unit is controlled based on the detection result by the sensor unit And a controller configured to control the washing of the toilet.

Wherein the control unit controls the display unit to be in a first display state when the user senses by the sensor unit and controls the display unit in a first display state of the display unit for a first time And controls the valve assembly to supply the washing water to the drain pipe in response to the user not being sensed by the sensor unit in the second display state of the display unit, And the display unit may be controlled to a third display state when a second predetermined time has elapsed after supplying the washing water to the drain pipe.

The first display state, the second display state, and the third display state may correspond to states in which the display portions are lighted in different colors, respectively.

Wherein the control unit controls the valve assembly so that the washing water is supplied to the drain pipe in response to the button being pressed by the user, The controller may control the valve assembly so that the washing water is not supplied to the drain pipe even if the user does not sense the sensor unit in the second display state of the display unit for the set third time.

The sensor unit is further configured to receive a user input for setting a beep, and the control unit can control the display unit to a fourth display state in response to the user input.

The valve assembly comprising: a core valve configured to open or close a flow path between the water supply pipe and the water discharge pipe; And a quantity adjusting screw connected to the core valve and configured to adjust the degree of opening and closing of the core valve by rotation.

Wherein the sensor unit includes an infrared sensor and the controller calculates a distance to the wall surface of the sensor unit using the infrared signal of the sensor unit in a state where the sensor unit does not detect the user, Can be determined as the predetermined distance.

Controlling the display unit to a first display state when a user positioned within a predetermined distance from the sensor unit is sensed by the sensor unit; Controlling the display unit to be in a second display state in response to a state in which a user is sensed by the sensor unit in a first display state of the display unit for a first predetermined time period; The control unit controls the valve assembly connected between the water supply pipe to which the washing water is supplied and the drain pipe to be connected to the drain hole of the toilet bowl in response to the user not being sensed by the sensor unit in the second display state of the display unit, Supplying water to the drain pipe; Controlling the display unit to the third display state after a predetermined second time period has elapsed after supplying the washing water to the drain pipe; And detecting an electric power supply error to the sensor unit in order to determine whether or not the washing water supply is blocked by the valve assembly.

The first display state, the second display state, and the third display state may correspond to states in which the display portions are lighted in different colors, respectively.

Controlling the valve assembly such that rinse water is supplied to the drain pipe in response to the button being pressed by the user; And controlling the valve assembly so that the washing water is not supplied to the drain pipe even if the sensor unit does not detect the user in the second display state of the display unit for a third predetermined time after the button is pressed .

Receiving user input for setting a fine setting; And controlling the display unit to the fourth display state in response to the user input.

And stopping supply of washing water to the drain pipe in response to detection of a power supply error to the sensor unit.

Wherein the sensor unit includes an infrared sensor and calculates a distance to a wall surface of the sensor unit using the infrared signal of the sensor unit in a state in which the sensor unit does not detect the user, And determining the calculated distance as the predetermined distance.

According to the sensor system for cleaning the toilet bowl according to the present invention and the automatic cleaning method of the toilet, by activating the cleaning cycle electronically based on the sensor for user detection, the user does not need physical contact to press the button for cleaning, Sanitation can be guaranteed.

According to the sensor system for cleaning the toilet bowl and the automatic cleaning method of the toilet bowl according to the present invention, when the sensor core valve is automatically locked in the case of failure or deterioration of the electric wire for interrupting electric power supplied to the sensor and supplying electric power, It is possible to prevent the waste water from being wasted due to the washing water.

According to the sensor system for washing the toilet bowl according to the present invention and the automatic washing method of the toilet, the sensor is provided with a water conditioner, so that it is possible to recognize the object of washing and the water saving in use, and perform automatic washing in necessary quantity. The volume can be controlled by a mechanical method using an adjusting screw and / or by an electrical method using a remote controller.

Further, according to the sensor system for cleaning the toilet bowl according to the present invention and the automatic washing method of the toilet, the sensor system detects the user by using an indicator such as a light-emitting diode, A state in which the object to be sensed disappears and a state in which the object to be cleaned is cleared, and a state in which the object is in a waiting state after the completion of the cleaning, and the like, so that the user can easily recognize the current state of the cleaning cycle by the sensor.

According to the sensor system for cleaning the toilet bowl according to the present invention and the automatic washing method of the toilet, when the user manually presses the button by pressing the button separately from the cleaning cycle by the sensor, So that the waste of the washing water due to the double washing can be prevented.

In addition, according to the sensor system for cleaning the toilet bowl according to the present invention and the automatic cleaning method of the toilet, the sensing distance for sensing the user by the sensor using the infrared sensor can be automatically adjusted to a distance suitable for the installation environment, The sanitary washing can be performed and waste of the washing water can be prevented.

1 is an exploded perspective view of a sensor system for cleaning a toilet bowl according to an embodiment of the present invention,
FIG. 2 is a conceptual diagram showing an installation state of a sensor system for cleaning a toilet bowl according to an embodiment of the present invention,
3 is a conceptual diagram showing a display form of a sensor system for washing a toilet in accordance with an embodiment of the present invention,
FIG. 4 is a flowchart of a method of automatically cleaning a toilet according to an embodiment of the present invention,
FIG. 5 is a flowchart illustrating an operation when a power supply error occurs in a method of automatically cleaning a toilet in accordance with an embodiment of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT Hereinafter, a sensor system for washing a toilet of the present invention and an automatic washing method of a toilet bowl according to the present invention will be described in detail with reference to the accompanying drawings.

1 is an exploded perspective view of a sensor system for washing a toilet in accordance with an embodiment of the present invention. 1, the sensor system according to the present embodiment includes a valve assembly 10, a display unit 20, a sensor unit 30, a power monitoring unit 40, and a control unit 50. As shown in FIG. The power monitoring unit 40 and the control unit 50 are each shown in a block form, but they may be composed of hardware such as one or more microcontroller units (MCU) programmed in a predetermined manner.

The valve assembly 10 is provided within the box-shaped member 700 and is connected between the water supply pipe and the water discharge pipe to selectively block the supply of the rinse water. To this end, the box-shaped member 700 may include a water pipe connection part 1 and a water pipe connection part 2. When the core valve 100 of the valve assembly 10 is in an open state, the washing water supplied through the water supply pipe connection part 1 is supplied to the drain of the toilet through the core valve 100 and the drain pipe connection part 2, .

In one embodiment of the present invention, the water supply pipe connection portion 1 is configured to be connectable to a water supply pipe having an inner diameter of 25 mm or more. Also, in one embodiment of the present invention, the drain pipe connecting portion 2 is configured to be connectable with a valve pipe having an outer diameter of 32 mm. However, this is merely exemplary, and the shape or numerical value of each connecting portion is not limited thereto.

In one embodiment of the present invention, the valve assembly 10 includes a quantity control screw 110 connected to the core valve 100. If the washing water supplied to the toilet is too small or does not come out easily, or if the amount of washing water is excessive, the washing water can be adjusted by turning the water amount adjusting screw (110). For example, when the water amount adjusting screw 110 is turned clockwise by using a flat screwdriver or the like, the water amount can be reduced. On the contrary, if the water amount adjusting screw 110 is turned counterclockwise, the water amount can be increased.

The box-shaped member 700 is provided with a power connection portion 701, which is an open region through which the wiring can pass. The power monitoring unit 40 and the control unit 50 can be sequentially connected to the battery box, the power box, and the adapter for DC-AC conversion through the power connection unit 701. [ In an embodiment of the present invention, the battery box is provided in the box-shaped member 700, and the electric wire connected thereto is connected to the external power box and the adapter through the power connection portion 701.

One area of the box-shaped member 700 can be opened for maintenance. The protection box 600 can be coupled to the open area of the box-shaped member 700 using the first fixing screw 500. The cover plate 400 can be coupled to the protective box 600 using the second fixing screw 300 and the display unit 20 and the sensor unit 30 are mounted on the cover plate 400.

The display unit 20 is a display device configured to switch between a plurality of display states under the control of the control unit 50. [ In the present specification, the switching of the display state means that the interval or color of light emitted by one display element is changed, or the interval or color of light emitted when one display element is turned off It may mean that different display elements are turned on. In an embodiment of the present invention, the display unit 20 includes at least one light-emitting diode (LED) configured to emit light of a plurality of colors.

The sensor unit 30 is configured to detect a user located within a preset sensing distance. For example, the sensor unit 30 includes an infrared sensor. The sensor unit 30 can detect a user located within a sensing distance by using an infrared signal reflected from the infrared sensor after being irradiated with an infrared signal.

The control unit 50 controls the cleaning cycle using the sensing result of the sensor unit 30 and displays the state of the cleaning system according to the cleaning cycle using the display unit 20. [ For example, the control unit 50 divides the cleaning cycle into a plurality of states, and controls the display unit 20 so that the display unit 20 generates light of a different color in each state. In addition, the control unit 50 controls the valve assembly 10 according to the cleaning cycle so that the cleaning water is supplied to the toilet at an appropriate time.

For example, the controller 50 causes the LED to be turned off when there is no object to be sensed, the LED to turn blue when there is an object to be sensed within the sensing distance, and the sensing object is continuously sensed for a predetermined period of time The LED is turned to red when the user is using the toilet machine and the washing water is supplied for a predetermined time (for example, 5 seconds) by controlling the valve assembly 10 when the sensing object disappears within the sensing distance, The display unit 20 can be controlled so that the display state is changed according to the cleaning cycle by changing the LED to purple. After the cleaning cycle is finished, the LED turns off again and returns to the initial state.

The power monitoring unit 40 senses the power supplied from the outside and detects whether or not the electric circuit is cut off, the function of the electric wire for power supply is degraded, or a failure occurs. When the power supply failure is detected by the power monitoring unit 40, the control unit 50 automatically locks the core valve 100 of the valve assembly 10, thereby wasting cleaning water due to a sensor malfunction .

The hardware such as the MCU constituting the power monitoring unit 40 and the control unit 50 may be electrically connected to the display unit 20 and the sensor unit 30 by a conductor (not shown) have. Meanwhile, the cover plate 400 on which the display unit 20 and the sensor unit 30 are formed can be covered with the decorative plate 200 again.

The decorative panel 200 is provided with a first window 201 through which an infrared signal or the like passes so as to be sensed by the sensor unit 30 and a second window 201 through which the display area of the display unit 20 is exposed 202 are provided. The first and second windows 201 and 202 may be an open area where a part of the decorative plate 200 is removed or an area where an optically transparent material such as glass is further formed in the open area.

If maintenance of the cleaning system is required, for example, adjustment of the water quantity by the quantity adjusting screw 110, connection of the water supply pipe and drainage pipe, cleaning of the water supply pipe and the filter connected to the water supply pipe is required, a suction cup (3) The cover plate 400 and the protective box 600 can be removed by lifting up the decorative plate 200 and sequentially releasing the second and first fixing screws 300 and 500. [

In one embodiment of the invention, the cleaning system is further configured to receive user input and thereby control the cleaning. In this case, the sensor unit 30 is further configured to not only detect the user through the first window 201, but also receive user input for adjusting the trim. For example, the user can transmit a user input to the sensor unit 30 using a remote controller (not shown) or the like which transmits an infrared signal.

For example, the quantity of 3L, 4L, 4.5L, 5.5L, 6L, 6.5L, 7.5L, and 8.5, based on the quantity of standard pipe 1 inch and static pressure 3.0MPa, L, and 9L, respectively. When the user selects a desired quantity and presses a final decision button (for example, the "OK" button) using the buttons of the remote controller (e.g., "+ & It is possible to notify the user that an input for adjustment of the ceiling is received by switching the display state of the display (for example, blinking blue).

In one embodiment of the present invention, the cleaning system further comprises a button (not shown) configured to be pressed and pressed by the user for manual cleaning. When the manual cleaning button is pressed, the control unit 50 controls the valve assembly 10 so that the washing water is immediately supplied to the drain pipe. The control unit 50 also prevents the unnecessary double cleaning by the automatic cleaning cycle and the manual cleaning button by interrupting the supply of the washing water without being influenced by the state of the cleaning cycle for a predetermined time after the manual washing button is pressed do.

2 is a conceptual diagram showing an installation state of a sensor system for cleaning a toilet bowl according to an embodiment of the present invention. 2, the sensor system 5 according to an embodiment of the present invention is disposed in a concealed form inside a wall 8 such as a closed wall of a building and has a water pipe connection part 1 and a water pipe connection part 2 to the concealed water supply and drainage pipes in the wall 8 as well. The drain pipe (61) is fastened to the drain hole of the toilet machine (6). Meanwhile, the cleaning system 5 is configured to detect the user 7 who wants to use the toilet machine 6 through the window formed on the decorative plate 200. In order to operate the sensor system 5, the sensor system 5 is configured such that the windows formed on the decorative plate 200 of the sensor system 5 are covered by the cover 60 even when the cover 60 of the toilet machine 6 is raised It should be installed in a position not covered.

3 is a conceptual diagram showing a display form of a sensor system for cleaning a toilet bowl according to an embodiment of the present invention. As shown in Fig. 3, the decorative plate 200 of the cleaning system includes a first window 201 corresponding to the sensing area and a second window 202 corresponding to the display area. A signal for user detection such as an infrared signal is radiated to the outside from the sensor unit through the first window 201 and a signal reflected from the outside can be incident on the sensor unit. Also, light generated by the display through the second window 202 can be viewed outside the cleaning system. The light viewed through the second window 202 can be changed to a different color depending on the current state of the cleaning cycle, which will be described in detail below with reference to FIG.

4 is a flowchart illustrating a method of automatically cleaning a toilet according to an embodiment of the present invention. For convenience of explanation, a method of automatically cleaning a toilet bowl according to an embodiment of the present invention will be described with reference to FIGS. 1 and 4. FIG.

First, the controller 50 senses the adjacent wall surface from the position where the sensor system is installed using the sensor unit 30, and sets the distance to the adjacent wall surface as the sensing distance (S11). For example, the infrared signal irradiated by the sensor unit 30 is irradiated through the first window 201 of the decorative plate 200 to the wall surface located on the front surface of the sensor system, and then reflected therefrom, The distance to the wall surface can be calculated through the signal input to the sensor unit 30 through the signal line 201. The detection distance can be appropriately adjusted within, for example, 850 mm, but is not limited thereto.

The control unit 50 monitors whether or not a user located within the sensing distance is sensed by the sensor unit 30 (S12), and controls the display unit to the first display state when the user senses it (S13). For example, the display unit 20 may be turned off when no user is detected, that is, in a state in which no light is generated, and may generate blue light as a first display state when the user is sensed.

After the user is first detected, the control unit 50 monitors whether the state in which the user is sensed is maintained for a predetermined first time (S14). The first time may be, for example, 6 seconds as a reference time for determining whether the sensed user actually uses the toilet, but is not limited thereto.

If the user detection state continues for the first time, the control unit 50 controls the display unit to the second display state (S15). The second display state is used to indicate that the system recognizes that the user is using the toilet. The second display state is a state in which the interval and / or color of light generated by the display unit 20 is different from the first display state. For example, when the display unit 20 generates blue light in the first display state, if the user recognizes that the user is using the toilet, the display unit 20 can change the color of the generated light to red.

After changing to the second display state, the controller 50 monitors whether the sensed user disappears (S16). This means that the sensor unit 30 no longer detects the user. When the user disappears, the control unit 50 supplies the cleansing water to the toilet flusher by controlling the valve assembly 10 (S17). The control unit 50 can control the valve assembly 10 so that the washing water is supplied for a predetermined second time. At this time, the second time is the time required for supplying the washing water sufficient to wash the toilet flush, and may be, for example, 5 seconds, but is not limited thereto.

When the second time has elapsed after the start of cleaning (S18), the control unit 50 can control the display unit 20 to the third display state (S19). The third display state is a state in which the cleansing of the toilet is completed and is different from the first display state and the second display state in that the interval and / or color of light generated by the display unit 20 is different. For example, when the display unit 20 generates red light in the second display state, the display unit 20 can change the color of the generated light to purple when the cleaning time has elapsed.

Finally, after the third display state is maintained for a predetermined time, the display unit 20 is turned off (S20), and the cleaning cycle is completed.

On the other hand, if the sensor system includes a button for manual cleaning, the button may be pressed by the user during the above-described cleaning cycle (S21). In this case, the control unit 50 controls the valve assembly 10 so that the washing water is supplied to the toilet bowl in response to the button input (S22). When the washing water is supplied to the toilet bowl by the button input and the washing is again performed by the automatic washing cycle described above, the washing is repeatedly performed. Therefore, the controller 50 controls the sensor unit 30 controls the valve assembly 10 to prevent automatic cleaning even if the user is lost. That is, the display unit 20 is turned off immediately after the manual cleaning by the button input (S23), and the cleaning cycle can be ended.

In FIG. 1, a button for manual cleaning is depressed (S21) in a step S13 in which the user is detected and the display unit is in the first display state. However, this is for illustrative convenience only, At any point in time, the button can be pressed for manual cleaning, and in response, the step S21 is initiated to allow manual cleaning.

FIG. 5 is a flowchart illustrating an operation when a power supply error occurs in a method of automatically cleaning a toilet in accordance with an embodiment of the present invention. The detection of the power supply error according to the embodiment of the present invention is always performed irrespective of the cleaning cycle and is configured to automatically shut off the core valve at any time when a power supply error is detected. Accordingly, the operation shown in Fig. 5 can be performed at any of the steps shown in Fig.

As shown in FIG. 5, first, the power monitoring unit can detect a power supply / demand error (S31). Power supply and demand errors in this specification refer to electrical interruption, degradation or failure of conductors for power supply, or any other type of electrical malfunction that may affect the operation of the cleaning system according to the present embodiment. If such a power supply error is detected, the control unit immediately locks the core valve of the valve assembly (S32). Therefore, waste of the washing water can be prevented from occurring due to malfunction of the sensor unit or the control unit.

While the invention has been shown and described with reference to certain embodiments thereof, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. However, it should be understood that such modifications are within the technical scope of the present invention. Accordingly, the true scope of the present invention should be determined by the technical idea of the appended claims.

1: water pipe connection part 2: water pipe connection part
10: valve assembly 20:
30: Sensor unit 40: Power monitoring unit
50: control unit 100: core valve
110: Quantity adjusting screw 200:
201: first window 202: second window
300: second fixing screw 400: cover plate
500: first fixing screw 600: protective box
700: box-shaped member 701: power connection part

Claims (12)

A valve assembly connected between a water supply pipe to which washing water is supplied and a drain pipe to be connected to a drain hole of the toilet, and to selectively discharge washing water flowing through the water supply pipe to the toilet through the drain pipe;
A sensor unit configured to detect a user located within a predetermined distance;
A display unit configured to switch between a plurality of display states;
A power monitoring unit configured to detect a power supply error to the infrared sensor; And
The control unit controls the valve assembly so that supply of washing water to the drain pipe is blocked when the power supply error is detected by the power monitoring unit and the display state of the display unit is controlled based on the detection result by the sensor unit And a control unit,
Wherein,
Wherein the control unit controls the display unit to be in a first display state when the user senses by the sensor unit, and when the state in which the user is sensed by the sensor unit in the first display state of the display unit continues for a first predetermined time, Controls the valve assembly so that rinse water is supplied to the drain pipe in response to the user not being sensed by the sensor unit in the second display state of the display unit, And to control the display unit to the third display state when a second predetermined time elapses after supplying the washing water. The method according to claim 1,
Wherein the first display state, the second display state, and the third display state correspond to states in which the display portions are lighted in different colors, respectively. The method according to claim 1,
Further comprising a button configured to be pressed and pressed by a user,
Wherein the control unit controls the valve assembly so that the washing water is supplied to the drain pipe in response to the user pressing the button, the control unit controls the valve assembly in the second display state of the display unit for a third predetermined time after the button is pressed And to control the valve assembly so that rinse water is not supplied to the drain pipe even if the sensor unit does not detect the user. The method according to claim 1,
The sensor unit is further configured to receive a user input for setting a trim level,
Wherein the controller is further configured to control the display to a fourth display state in response to the user input. The method according to claim 1,
The valve assembly includes:
A core valve configured to open or close a flow path between the water supply pipe and the water discharge pipe; And
And a quantity controlling screw connected to the core valve and configured to adjust an opening / closing degree of the core valve by rotation. The method according to claim 1,
Wherein the sensor unit includes an infrared sensor,
Wherein the control unit calculates the distance to the wall surface of the front surface of the sensor unit using the infrared signal of the sensor unit in a state where the sensor unit does not detect the user and determines the calculated distance as the predetermined distance Wherein said sensor system comprises: Controlling the display unit to a first display state when a user positioned within a predetermined distance from the sensor unit is sensed by the sensor unit;
Controlling the display unit to be in a second display state in response to a state in which a user is sensed by the sensor unit in a first display state of the display unit for a first predetermined time period;
The control unit controls the valve assembly connected between the water supply pipe to which the washing water is supplied and the drain pipe to be connected to the drain hole of the toilet bowl in response to the user not being sensed by the sensor unit in the second display state of the display unit, Supplying water to the drain pipe;
Controlling the display unit to the third display state after a predetermined second time period has elapsed after supplying the washing water to the drain pipe; And
And detecting an electric power supply error to the sensor unit to determine whether or not the washing water supply cutoff by the valve assembly is blocked. 8. The method of claim 7,
Wherein the first display state, the second display state, and the third display state correspond to a state in which the display unit is lighted in a different color, respectively. 8. The method of claim 7,
Controlling the valve assembly such that rinse water is supplied to the drain pipe in response to the button being pressed by the user; And
And controlling the valve assembly so that the washing water is not supplied to the drain pipe even if the sensor unit does not detect the user in the second display state of the display unit for a third predetermined time after the button is pressed A method of automatic cleaning of a toilet. 8. The method of claim 7,
Receiving user input for setting a fine setting; And
And controlling the display unit to the fourth display state in response to the user input. 8. The method of claim 7,
Further comprising the step of stopping supply of the washing water to the drain pipe in response to detection of a power supply error to the sensor unit. 8. The method of claim 7,
Wherein the sensor unit includes an infrared sensor,
Calculating a distance to a wall surface of the front surface of the sensor unit using an infrared signal of the sensor unit in a state where the sensor unit does not detect the user; And
Further comprising the step of determining the calculated distance as the predetermined distance.

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