KR20220028534A - Dish washer - Google Patents

Abstract

The present invention relates to a dishwasher. The dishwasher, according to an embodiment of the present invention, comprises: a tub forming a washing chamber in which a washing object is stored and having one side open; a door opening and closing one side of the tub; a gasket sealing between the tub and the door and having elasticity; a sensing module disposed on one side of an edge of one side of the tub, and including a magnet moving as pressure is applied to the door, and a hall sensor installed by being spaced apart from the magnet, detecting a magnetic field change according to the movement of the magnet and outputting a sensing voltage value corresponding to the magnetic field change; and a controller determining the state of the door based on the sensing voltage value output from the sensing module, calculating the detection time of the pressure applied to the door based on the sensing voltage value, and adjusting the state of the door based on whether or not a cleaning operation is performed and the detection time. The present invention provides a dishwasher in which the door opens only when a user applies external force to the door to open the door.

Description

Dishwasher {DISH WASHER}

The present invention relates to a dishwasher.

A dishwasher is a home appliance that removes foreign substances remaining on the object to be washed by spraying washing water on the object to be washed, such as dishes or cooking tools.

Such a dishwasher includes a tub that forms a washing room in which the object to be washed is accommodated, a rack provided in the tub to accommodate dishes, a nozzle that sprays washing water into the rack, a sump that stores washing water, and a sump that supplies washing water stored in the sump to the spray arm. It is common to include a washing pump.

The tub has an open surface, and the open surface of the tub may be opened and closed by a door. When the door is opened, the washing chamber formed in the tub is connected to the outside, so that a user can put dishes into the washing chamber or take out dishes to the outside of the washing chamber. In addition, in the closed state, the washing chamber formed in the tub is blocked from the outside, so that washing water or steam is not sprayed to the outside while the dishwasher is operating.

Various methods are used as a method of controlling the state of the door of the dishwasher.

1 is a view for explaining a method of controlling a door state of a dishwasher according to the related art.

Referring to FIG. 1 , a dishwasher 100 according to the related art includes a door 110 and a tub 120 , and the tub 120 includes a circuit board 121 and a moving module 122 . In this case, the circuit board 121 includes a first pattern 121a and a second pattern 121b. And the moving module 122 includes a metal plate (122a).

In this case, in the conventional dish washing machine 100 , when the user lightly pushes the front side of the door 110 when the door 110 is in the closed state, the dish washing machine 100 detects this and switches the door 110 to the open state. can do.

As shown in FIG. 1A , when the door 110 is in the closed state, the metal plate 122a is positioned between the first pattern 121a and the second pattern 121b. At this time, when the user applies an external force to the front surface of the door 110, the moving module 122 is pushed into the tub 120 side, so that the metal plate 122a is located only on the second pattern 121b. Accordingly, an induced current flows through the first pattern 121a and the second pattern 121b, and when the dishwasher 100 senses the induced current, the door 110 can be switched from the closed state to the open state. .

However, in this method, a force is applied to the door 110 due to a cause such as an object flying from the outside and colliding with the door 110 or a user leaning on the door 110, so that the movement module 122 moves and induces Even when current flows, the door 110 of the dishwasher 100 may change to an open state. This may cause the door 110 to be opened when the user does not want it, which may cause user dissatisfaction. Also, if such a situation occurs during operation of the dishwasher 100, it may cause a safety accident.

And since the moving module 122 by an external force moves to the door 110 and uses an induced current that flows, if the door 110 is still without an induced current flowing, the current state of the door 110 is open or closed state cannot be determined.

SUMMARY OF THE INVENTION An object of the present invention is to provide a dishwasher in which a door is opened only when a user applies an external force to the door to open the door.

Another object of the present invention is to provide a dishwasher capable of determining the current state of a door.

Another object of the present invention is to provide a dishwasher that is less likely to be opened by an external force erroneously applied to a door while the dishwasher is operating.

Another object of the present invention is to provide a dishwasher in which the door does not open quickly when the temperature inside the dishwasher is high.

The objects of the present invention are not limited to the above-mentioned objects, and other objects and advantages of the present invention not mentioned can be understood by the following description, and will be more clearly understood by the examples of the present invention. Further, it will be readily apparent that the objects and advantages of the present invention may be realized by the means and combinations thereof indicated in the claims.

In the present invention, the dishwasher includes a magnet that moves as pressure is applied, a sensing module including a Hall sensor that outputs a sensing voltage value corresponding to a change in a magnetic field according to the movement of the magnet, and the pressure applied to the door based on the sensing voltage value. and a controller that calculates the detection time of , and adjusts the state of the door based on whether the cleaning operation is performed and the detection time.

According to such a configuration, the door can be opened only when the user applies an external force to the door to open the door.

According to an embodiment of the present invention, the dishwasher forms a washing chamber in which the object to be washed is accommodated, a tub with one side open, a door that opens and closes one side of the tub, seals between the tub and the door, and improves elasticity A gasket having a gasket, which is disposed on one side of the edge of one side of the tub, a magnet that moves as pressure is applied to the door, and is installed to be spaced apart from the magnet, detects a magnetic field change according to the movement of the magnet, and responds to the magnetic field change A detection module including a Hall sensor for outputting a corresponding detection voltage value and a state of the door are determined based on the detection voltage value output from the detection module, and the pressure applied to the door is determined based on the detection voltage value. and a controller that calculates a detection time and adjusts the state of the door based on whether a cleaning operation is performed and the detection time.

Also, in one embodiment of the present invention, the sensing module of the dishwasher is disposed on one side of the edge connected to the upper surface of the tub among the edge of one surface of the tub.

Also, in one embodiment of the present invention, a magnet is disposed at one end of the dishwasher, and when pressure is applied to the door, the shaft moves together with the magnet, the magnet, the Hall sensor, and the shaft are accommodated, and the shaft moves and a case in which a path is formed and a spring disposed between the shaft and the Hall sensor.

Also, in an embodiment of the present invention, the center of the magnet, the center of the Hall sensor, and the center of the shaft of the dishwasher are positioned on a straight line.

Also, in an embodiment of the present invention, when pressure is applied to the door, the shaft of the dishwasher moves in a direction in which the hall sensor is located, and when the pressure applied to the door is released, the shaft is initially formed by the elastic force of the gasket and the spring. move to location

Also, in one embodiment of the present invention, the controller of the dishwasher compares the sensed voltage value during initial driving with a polarity reference value, and if the sensed voltage value during initial driving is less than the polarity reference value, the N-pole end of the magnet is It is determined that the Hall sensor faces the direction, and if the sensing voltage value during the initial driving is equal to or greater than the polarity reference value, it is determined that the S pole end of the magnet faces the direction in which the Hall sensor is located.

Also, in an embodiment of the present invention, when the controller of the dishwasher determines that the N-pole end of the magnet faces the direction in which the Hall sensor is located, the controller compares the first open reference value with the sensed voltage value, and the sensed voltage value If it is greater than or equal to the first open reference value, the door state is determined as an open state, and when the sensed voltage value is less than the first open reference value, the door state is determined as a closed state, and the controller determines the S pole of the magnet When it is determined that the end faces the direction in which the Hall sensor is located, a second open reference value and the sensed voltage value are compared, and if the sensed voltage value is less than the second open reference value, the door state is determined as an open state, and When the sensed voltage value is equal to or greater than the second open reference value, the door state is determined as a closed state.

Also, in an embodiment of the present invention, the controller of the dishwasher calculates a difference value between the sensed voltage value and the sensed reference value, and if the difference between the sensed voltage value and the sensed reference value is equal to or greater than the first determination reference value, the pressure applied to the door is applied, it is determined whether the difference value between the detection voltage value and the detection reference value has reached the maximum value, and when the difference value between the detection voltage value and the detection reference value is less than the maximum value by a second determination reference value or more, the door is closed It is judged that the applied pressure is released.

In addition, in an embodiment of the present invention, the controller of the dish washing machine determines that the difference between the sensed voltage value and the sensed reference value is greater than the maximum value from a time when the difference between the sensed voltage value and the sensed reference value is equal to or greater than the first determination reference value. 2 The time until the time decreased by the judgment reference value is calculated as the detection time.

Also, in one embodiment of the present invention, the controller of the dishwasher changes the door to the open state when the detection time is greater than or equal to the first reference time and less than the second reference time when the dishwasher is not performing a washing operation and if the detection time is less than the first reference time or more than the second reference time, the door is maintained in a closed state, and the controller is configured to set the detection time to a third time when the dishwasher is performing a washing operation. If it is longer than the reference time and less than the fourth reference time, the door is changed to the open state, and if the detection time is less than the third reference time or longer than the fourth reference time, the door is maintained in the closed state.

Also, in an embodiment of the present invention, the third reference time is a time exceeding the first reference time and less than the second reference time, and the fourth reference time is a time equal to or longer than the second reference time.

Also, in an embodiment of the present invention, a difference value between the third reference time and the first reference time is the same as a difference value between the fourth reference time and the second reference time.

Also, in an embodiment of the present invention, when the dishwasher is performing a washing operation, the controller of the dishwasher sets the number of times of door open input once when the detection time is longer than the third reference time and less than the fourth reference time If the detection time is less than the third reference time or longer than the fourth reference time, the door is maintained in a closed state, and the controller is configured to control the number of times the door open input is N times (N is a natural number greater than or equal to 2). The door is converted to an open state, and the number of times of the door open input is changed to 0.

Also, in an embodiment of the present invention, the dishwasher further includes a notification module for outputting a notification based on a command received from the controller, and the controller is configured to determine the detection time when the dishwasher is not performing a washing operation. When the first reference time or more, the notification module is controlled to output a normal notification, when the detection time is longer than the second reference time, the notification module is controlled to output a warning notification, the controller If the washing machine is performing a washing operation, the notification module controls to output a normal notification when the detection time is longer than the third reference time, and when the detection time is longer than the fourth reference time, the notification module Control to output warning notifications.

Also, in an embodiment of the present invention, when changing the door to the open state, the controller of the dishwasher changes the door to the open state after a first delay time elapses.

In addition, in an embodiment of the present invention, the dishwasher further includes a temperature sensor for sensing a temperature of the washing room, and the controller changes the temperature of the washing room detected by the temperature sensor when the door is changed to an open state. If the temperature is equal to or greater than the reference temperature, the door is changed to the open state after a second delay time longer than the first delay time has elapsed.

Further, in an embodiment of the present invention, the dishwasher further includes a temperature sensor for sensing a temperature of the washing room, and the controller determines to change the door to an open state, and then the temperature sensor sensed by the temperature sensor If the temperature of the washing chamber is equal to or higher than the reference temperature, the door is changed to an open state after the temperature of the washing chamber is lower than the reference temperature.

The dishwasher according to the present invention has an advantage in that the door is not opened when the user does not want it because the door is changed to the open state based on the detection time.

In addition, the dishwasher according to the present invention determines the state of the door by comparing the sensed voltage value output by the hall sensor with the first open reference value or the second open reference value, so that the current state of the door can be determined even when the door is still. there are advantages to

In addition, the dishwasher according to the present invention maintains the door closed when the detection time is less than the third reference time or longer than the fourth reference time when the washing operation is being performed, so that the door is closed due to an erroneously applied external force during the washing operation. It has the advantage of reducing the safety accidents that may occur due to the change to the open state.

In addition, the dishwasher according to the present invention compares the temperature of the washing room with the reference temperature and adjusts the timing of changing the door to the open state. Therefore, safety that may occur when the temperature inside the dishwasher is high This has the advantage of reducing accidents.

In addition to the above-described effects, the specific effects of the present invention will be described together while describing specific details for carrying out the invention below.

1 is a view for explaining a method of controlling a door state of a dishwasher according to the related art.
2 is a diagram illustrating a dishwasher according to an embodiment of the present invention.
3 is a cross-sectional view taken along line “AA” of FIG. 2 .
4 is a perspective view illustrating a sensing module of a dishwasher according to an embodiment of the present invention.
5 is an exploded perspective view illustrating an exploded state of some components of a sensing module of a dishwasher according to an embodiment of the present invention.
6 is a perspective view illustrating a state in which a sensing module of a dishwasher is coupled to a tub according to an embodiment of the present invention.
7 is an enlarged view illustrating an enlarged portion "B" of FIG. 3 .
8 is a flowchart illustrating an operation of a dishwasher according to an embodiment of the present invention.
9 is a flowchart illustrating step S810 of FIG. 8 in more detail.
10 is a flowchart illustrating step S830 of FIG. 8 in more detail.
11 is a graph for explaining a detection time used for an operation of a dishwasher according to an embodiment of the present invention.
12 is a flowchart illustrating a method in which the dishwasher adjusts the state of a door based on whether a washing operation is performed and a detection time according to an embodiment of the present invention.
13 is a flowchart illustrating another method of adjusting a state of a door based on a detection time when the dishwasher is performing a washing operation according to an embodiment of the present invention.
14 is a flowchart illustrating a method of changing a door to an open state according to a temperature of a washing room by the dishwasher according to an embodiment of the present invention.
15 is a flowchart illustrating a method of changing a door to an open state according to a temperature of a washing room by a dishwasher according to another embodiment of the present invention.

The above-described objects, features and advantages will be described below in detail with reference to the accompanying drawings, and accordingly, those of ordinary skill in the art to which the present invention pertains will be able to easily implement the technical idea of the present invention. In describing the present invention, if it is determined that a detailed description of a known technology related to the present invention may unnecessarily obscure the gist of the present invention, the detailed description will be omitted. Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

Although the first, second, etc. are used to describe various elements, these elements are not limited by these terms, of course. These terms are only used to distinguish one component from other components, and unless otherwise stated, it goes without saying that the first component may be the second component.

In the following, that an arbitrary component is disposed on the "upper (or lower)" of a component or "above (or below)" of a component means that any component is disposed in contact with the upper surface (or lower surface) of the component. Furthermore, it may mean that other components may be interposed between the component and any component disposed on (or under) the component.

Also, when it is described that a component is "connected", "coupled" or "connected" to another component, the components may be directly connected or connected to each other, but other components are "interposed" between each component. It is to be understood that “or, each component may be “connected,” “coupled,” or “connected,” through another component.

Throughout the specification, unless otherwise stated, each element may be singular or plural.

As used herein, the singular expression includes the plural expression unless the context clearly dictates otherwise. In the present application, terms such as "consisting of" or "comprising" should not be construed as necessarily including all of the various components or various steps described in the specification, some of which components or some steps are It should be construed that it may not include, or may further include additional components or steps.

Hereinafter, dish washing machines according to some embodiments of the present invention will be described.

2 is a diagram illustrating a dishwasher according to an embodiment of the present invention.

Referring to FIG. 2 , the dishwasher 200 according to an embodiment of the present invention includes a tub 210 , a door 220 , a gasket 230 , and a detection module 240 . Also, although not shown in the drawings, the dishwasher 200 according to an embodiment of the present invention includes a controller. And the dishwasher 200 according to an embodiment of the present invention may further include an outer case 205 , one or more racks 251 , 252 , one or more nozzles 261 , 262 , 263 , and a washing water supply unit 290 . can

The outer case 205 forms the exterior of the dishwasher 200 .

The tub 210 forms a washing chamber 211 in which the object to be washed is accommodated therein. Such a tub 210 is provided inside the outer case 205, and has an open shape. In an embodiment of the present invention, the tub 210 may be formed in a hexahedral shape with one surface open.

One or more racks 251 and 252 are disposed inside the washing chamber 211, and the object to be washed is accommodated therein. The one or more racks 251 and 252 may include an upper rack 251 disposed above the washing room 211 and a lower rack 252 disposed below the washing room 211 .

One or more nozzles 261 , 262 , and 263 are disposed inside the washing chamber 211 to spray washing water to the washing object. The one or more nozzles 261 , 262 , and 263 include an upper nozzle 262 and a lower nozzle 263 disposed to be spaced apart from each other in the upper and lower portions of the washing chamber 211 , and a top nozzle 261 disposed at the uppermost end of the washing chamber 211 . may include At this time, the one or more nozzles 261 , 262 , and 263 may rotate and evenly spray the washing water to the washing object.

The washing water supply unit 270 is disposed below the tub 210 and supplies washing water to one or more nozzles 261 , 262 , and 263 . The washing water supply unit 270 includes a sump in which washing water is stored, a washing pump supplying washing water stored in the sump to one or more nozzles 261, 262, 263, a heater heating the washing water inside the washing pump, and controlling the flow of washing water. It may include a valve, a pipe through which washing water flows, and the like.

The door 220 opens and closes an open surface of the tub 210 . That is, the door 220 is provided on one open surface of the tub 210 to open and close the washing chamber 211 . The door 220 may be opened and closed automatically, or may be opened and closed manually.

The door 220 has either an open state or a closed state. The door 220 allows the washing chamber 211 formed in the tub 210 to be connected to the outside in an open state so that a user can put dishes into the washing chamber 211 or take out dishes to the outside of the washing chamber 211 . do. In addition, the door 220 blocks the washing chamber 211 formed in the tub 210 from the outside in the closed state, so that washing water or steam is not sprayed to the outside while the dishwasher 200 is operating.

The gasket 230 seals between the tub 210 and the door 220 . That is, the gasket 230 is disposed between the tub 210 and the door 220 to prevent a gap that may occur between the tub 210 and the door 220 when the door 220 is in a closed state.

The gasket 230 may be disposed on one open surface of the tub 210 or one surface of the door 220 in the tub 210 direction. At this time, the gasket 230 is disposed along the edge of the open surface of the tub 210 or in contact with the edge of the open surface of the tub 210 in the closed state among one surface of the door 220 in the tub 210 direction. It may be disposed along an area.

The gasket 230 may be made of a material having elasticity. In an embodiment of the present invention, the gasket 230 may be made of soft rubber. Accordingly, the gasket 230 may be compressed when an external force is applied to the door 220 . In addition, the gasket 230 expands as the external force applied to the door 220 is released and may be restored to its original shape.

The detection module 240 is a module for detecting the state of the door 220 . The detection module 240 is disposed on one side of the edge of one open surface of the tub 210 . The location of the sensing module 240 may be described in more detail with reference to FIG. 3 .

3 is a cross-sectional view taken along line “A-A” of FIG. 2 .

Referring to FIG. 3 , it can be seen that a cross-sectional view of the upper surface of the tub 210 in which the sensing module 240 is located is shown. As such, the sensing module 240 may be disposed on one side of the edge connected to the upper surface of the tub 210 among the edges of one open surface of the tub 210 .

In an embodiment of the present invention, the detection module 240 may be disposed on the left or right side by the size of the latch 280 rather than the center of the edge connected to the upper surface of the tub 210 among the edges of the one open surface of the tub 210 . there is. At this time, if the detection module 240 is disposed at the center of an edge connected to the upper surface of the tub 210 among the edges of one open surface of the tub 210 , the state of the door 220 can be more accurately detected. However, at the center of the edge connected to the upper surface of the tub 210 among the edges of the open surface of the tub 210 , the latch for preventing the door 220 from leaving the tub 210 when the door 220 is closed (280) is usually formed. Therefore, the sensing module 240 may be disposed on the left or right side by the size of the latch 280 rather than the center of the edge connected to the upper surface of the tub 210 among the edges of one open surface of the tub 210 .

In another embodiment of the present invention, two detection modules 240 may be symmetrically disposed on the left and right sides of an edge connected to the upper surface of the tub 210 among the edges of one open surface of the tub 210 . In addition, a controller, which will be described later, may perform control using an average value of the sensing voltage values V _S output through the two sensing modules 240 . By using the two detection modules 240 as described above, the state of the door 220 can be more accurately detected.

Returning again to FIG. 2 , the sensing module 240 includes a magnet 241 and a hall sensor 242 . In addition, the sensing module 240 may further include a shaft 243 , a case 244 , and a spring 245 . A more detailed structure of the sensing module 240 may be described with reference to FIGS. 4 and 5 .

4 is a perspective view illustrating a sensing module of a dishwasher according to an embodiment of the present invention. 5 is an exploded perspective view illustrating an exploded state of some components of a sensing module of a dishwasher according to an embodiment of the present invention.

4 and 5 , the sensing module 240 includes a magnet 241 , a Hall sensor 242 , a shaft 243 , a case 244 , and a spring 245 .

The magnet 241 moves as pressure is applied to the door 220 . At this time, the magnet 241 may move together with the shaft 243 to be described later.

The magnet 241 includes an N pole and an S pole, and one of the N pole and the S pole may be disposed in the sensing module 240 to face the door 220 direction. The magnet 241 forms a magnetic field around it, and the magnetic field is sensed by a Hall sensor 242 to be described later.

The hall sensor 242 is installed to be spaced apart from the magnet 241 . The Hall sensor 242 detects a magnetic field change according to the movement of the magnet 241 , and outputs a sensing voltage value V _S corresponding to the magnetic field change to a controller to be described later.

The Hall sensor 242 includes a sensing unit 242a that directly senses a magnetic field. The sensing unit 242a of the Hall sensor 242 may be disposed to face the magnet 241 so that the Hall sensor 242 can more accurately detect the magnetic field generated by the magnet 241 .

Shaft 243 moves as pressure is applied to door 220 . One end of the shaft 243 is disposed to face the hall sensor 242 , and the other end of the shaft 243 is disposed to face the door 220 . At this time, a magnet 241 is disposed at one end of the shaft 243 .

One end of the shaft 243 toward the door 220 may have a bar shape. In addition, the other end of the shaft 243 in the Hall sensor 242 direction may be formed in a plate shape so that the magnet 241 and the spring 245 can be disposed.

When pressure is applied to the door 220 , the shaft 243 moves in the direction in which the Hall sensor 242 is located. In more detail, when pressure is applied to the door 220 , the other end of the shaft 243 is pushed by the door 220 , and the shaft 243 moves in the direction in which the Hall sensor 242 is located. At this time, the magnet 241 disposed at one end of the shaft 243 moves in the Hall sensor 242 direction together with the shaft 243 . Accordingly, the shaft 243 moves together with the magnet 241 when pressure is applied to the door 220 . Accordingly, the Hall sensor 242 may detect a change in the magnetic field according to the movement of the magnet 241 , and may output a sensing voltage value V _S corresponding to the change in the magnetic field.

When the pressure applied to the door 220 is released, the shaft 243 moves to the initial position by the elastic force of the gasket 230 . In more detail, when the pressure applied to the door 220 is released, the gasket 230 expands again by the elastic force and is restored to its original shape. At this time, the door 220 is pushed by the gasket 230 and moves in the opposite direction of the tub 210 . Accordingly, the shaft 243 also moves together with the gasket 230 to move to the initial position. At this time, the magnet 241 disposed at one end of the shaft 243 moves in a direction away from the Hall sensor 242 together with the shaft 243 . Accordingly, the Hall sensor 242 may detect a change in the magnetic field according to the movement of the magnet 241 , and may output a sensing voltage value V _S corresponding to the change in the magnetic field.

Case 244 houses magnet 241 , Hall sensor 242 , and shaft 243 . At this time, the case 244 accommodates the magnet 241, the Hall sensor 242, and the shaft 243 so that the center of the magnet 241, the center of the hall sensor 242, and the center of the shaft 243 are in a straight line. can do. That is, the center of the magnet 241 , the center of the Hall sensor 242 , and the center of the shaft 243 may be positioned on a straight line inside the case 244 . Here, the center of the Hall sensor 242 may be the sensing unit 242a of the Hall sensor 242 .

As such, by positioning the center of the magnet 241, the center of the Hall sensor 242, and the center of the shaft 243 in a straight line, the Hall sensor 242 can more accurately detect the displacement of the magnet 241 according to the external force. can

A path through which the shaft 243 moves is formed in the case 244 . The case 244 may include a guide part formed so that the rod-shaped end of the shaft 243 can move only in a direction away from or closer to the Hall sensor 242 . Accordingly, by preventing the magnet 241 and the shaft 243 from moving by the external force applied to the dishwasher 200 through the external case 205 or the like, rather than the external force applied through the door 220, the sensing module The sensing performance of 240 may be improved.

A spring 245 is disposed between the shaft 243 and the Hall sensor 242 . At this time, one end of the spring 245 may be disposed in contact with the other side of the shaft 243 having a plate shape. In addition, the other end of the spring 245 may be disposed in contact with the Hall sensor 242 .

The spring 245 may include a first spring 245a disposed on one side of the magnet 241 disposed on the other side of the shaft 243 and a second spring 245b disposed on the other side of the magnet 241 . .

The spring 245 causes the shaft 243 to return to its initial position when the pressure applied to the door 220 is released. In more detail, when the pressure applied to the door 220 is released, the spring 245 is relaxed by the elastic force and restored to its original shape. At this time, the shaft 243 is also pushed by the elastic force of the spring 245 to move to the initial position. In other words, when the pressure applied to the door 220 is released, the shaft 243 moves to the initial position by the elastic force of the gasket 230 and the spring 245 . At this time, the magnet 241 disposed at one end of the shaft 243 moves in a direction away from the Hall sensor 242 together with the shaft 243 . Accordingly, the Hall sensor 242 may detect a change in the magnetic field according to the movement of the magnet 241 , and may output a sensing voltage value V _S corresponding to the change in the magnetic field.

A structure in which the sensing module 240 as described above is coupled to the tub 210 may be described in more detail with reference to FIGS. 6 and 7 .

6 is a perspective view illustrating a state in which a sensing module of a dishwasher is coupled to a tub according to an embodiment of the present invention. 7 is an enlarged view illustrating an enlarged portion "B" of FIG. 3 .

6 and 7 , the sensing module 240 may be disposed on one side of an edge connected to the upper surface of the tub 210 among the edges of one open surface of the tub 210 . At this time, the sensing module 240 may be disposed such that one end of the rod-shaped shaft 243 faces the open surface of the tub 210 .

In this case, one end of the shaft 243 may be disposed to protrude to the outside of the tub 210 . And one end of the shaft 243 may be inserted into the gasket 230 . One end of the shaft 243 is inserted into the gasket 230 , but may not come into contact with the door 220 as shown in FIG. 7 . However, the present invention is not limited thereto, and one end of the shaft 243 is inserted into the gasket 230 and may come into contact with the door 220 as shown in FIG. 7 .

As such, since one end of the shaft 243 is inserted into the gasket 230 , the shaft 243 may move to the initial position by the elastic force of the gasket 230 when the pressure applied to the door 220 is released.

And, as indicated by C-C in FIG. 7 , the center of the magnet 241 , the center of the Hall sensor 242 , and the center of the shaft 243 may be positioned on a straight line inside the case 244 . As such, by positioning the center of the magnet 241, the center of the Hall sensor 242, and the center of the shaft 243 in a straight line, the Hall sensor 242 can more accurately detect the displacement of the magnet 241 according to the external force. can

Returning to FIG. 2 again, the sensing module 240 outputs the sensing voltage value V _S to the controller through the structure as described with reference to FIGS. 4 to 7 .

The controller determines the state of the door 220 based on the detection voltage value V _S output from the detection module 240 , and the detection time of the pressure applied to the door 220 based on the detection voltage value V _S . (Δt) is calculated, and the state of the door 220 is adjusted based on whether the washing operation is performed and the detection time Δt.

In addition, the controller may control all operations such as a washing operation of the dishwasher 200 . Such controllers include ASICs (Application Specific Integrated Circuits), DSPs (Digital Signal Processors), DSPDs (Digital Signal Processing Devices), PLDs (Programmable Logic Devices), FPGAs (Field Programmable Gate Arrays), controllers, microcontrollers ( It may be implemented by including a physical element including at least one of micro-controllers and microprocessors.

A more detailed operation of the controller may be described in more detail with reference to FIG. 8 .

8 is a flowchart illustrating an operation of a dishwasher according to an embodiment of the present invention.

Referring to FIG. 8 , first, the controller determines the polarity of the magnet 241 included in the sensing module 240 ( S810 ). In other words, the controller determines which end of the N-pole end or the S-pole end of the magnet 241 included in the sensing module 240 faces the direction in which the Hall sensor 242 is located. At this time, since which end of the magnet 241 faces the direction in which the hall sensor 242 is located cannot be changed after the dishwasher 200 is assembled, step S810 is performed when the dishwasher 200 is initially driven or the dishwasher ( 200) is initialized.

A more detailed method for the controller to determine the polarity of the magnet 241 included in the sensing module 240 may be described in more detail with reference to FIG. 9 .

9 is a flowchart illustrating step S810 of FIG. 8 in more detail.

Referring to FIG. 9 , the controller determines which end of the magnet 241 is oriented in the direction in which the Hall sensor 242 is located by comparing the sensing voltage value (V _SS ) and the polarity reference value (V _N ) during initial driving. . The controller determines whether the sensing voltage value (V _SS ) during initial driving is less than the polarity reference value (V _N ) ( S910 ).

The sensing voltage value V _S is a voltage value output by the Hall sensor 242 sensing a magnetic field generated by the magnet 241 . When the N pole end of the magnet 241 faces the direction in which the Hall sensor 242 is located and when the S pole end of the magnet 241 faces in the direction in which the Hall sensor 242 is located, it is sensed by the Hall sensor 242 Since the magnitude of the magnetic field is different, the Hall sensor 242 outputs different sensing voltage values V _S . Therefore, the controller may determine which end of the magnet 241 is oriented in the direction in which the Hall sensor 242 is located by comparing the sensing voltage value V _SS at the time of initial driving and the polarity reference value V _N .

In this case, the controller may use the analog-digital conversion of the sensed voltage value (V _S ). At this time, the controller may use analog-to-digital conversion of the sensed voltage value (V _S ) not only in step S810 but also in other steps.

The polarity reference value (V _N ) is a reference value for determining which end of the magnet 241 faces the direction in which the Hall sensor 242 is located, and the magnitude of the magnetic field generated by the magnet 241 , the Hall sensor 242 . ) may be set differently depending on the magnetic field sensing sensitivity of the magnetic field, the initial separation distance between the magnet 241 and the Hall sensor 242 .

When the sensing voltage value (V _SS ) during initial driving is less than the polarity reference value (V _N ), the controller may determine that the N-pole end of the magnet 241 faces the direction in which the Hall sensor 242 is located (S920) . Conversely, when the sensing voltage value (V _SS ) during initial driving is equal to or greater than the polarity reference value (V _N ), the controller may determine that the S pole end of the magnet 241 faces the direction in which the Hall sensor 242 is located (S920 ). ).

8 again, the controller determines the polarity of the magnet 241 and then determines the state of the door 220 based on the determined polarity of the magnet 241 (S930). In other words, the controller may determine the current state of the door 220 using different reference values according to the determined polarity of the magnet 241 .

A more detailed method for the controller to determine the state of the door 220 may be described in more detail with reference to FIG. 10 .

10 is a flowchart illustrating step S830 of FIG. 8 in more detail.

Referring to FIG. 10 , first, the controller determines whether the N-pole end of the magnet 241 faces the direction in which the Hall sensor 242 is located (S1010). In this case, the controller may use the result determined in step S810.

If the N-pole end of the magnet 241 faces the direction in which the Hall sensor 242 is located, the controller determines whether the sensing voltage value V _S is equal to or greater than the first opening reference value V _D1 ( S1020 ). And when the S pole end of the magnet 241 faces the direction in which the Hall sensor 242 is located, the controller determines whether the sensing voltage value V _S is less than the second opening reference value V _D2 ( S1030 ).

At this time, the first open reference value (V _D1 ) is a reference value for the controller to determine whether the state of the door 220 is an open state when the N-pole end of the magnet 241 faces the direction in which the hall sensor 242 is located. , the second open reference value (V _D2 ) is a reference value for the controller to determine whether the door 220 is in the open state when the S pole end of the magnet 241 faces the direction in which the hall sensor 242 is located . The first opening reference value (V _D1 ) and the second opening reference value (V _D2 ) are the magnitude of the magnetic field generated by the magnet 241 , the magnetic field detection sensitivity of the Hall sensor 242 , the magnet 241 and the Hall sensor 242 ) It may be set differently according to the initial separation distance between the two.

The controller determines the state of the door 220 as an open state when the N-pole end faces the direction in which the Hall sensor 242 is located and the sensed voltage value V _S is equal to or greater than the first open reference value V _D1 ( S1040). Conversely, the controller determines the state of the door 220 as a closed state when the N-pole end faces the direction in which the Hall sensor 242 is located, and the sensed voltage value V _S is less than the first open reference value V _D1 . (S1050).

In addition, when the S pole end faces the direction in which the Hall sensor 242 is located, if the sensed voltage value V _S is less than the second opening reference value V _D2 , it is determined that the state of the door 220 is an open state. (S1040). Conversely, the controller determines the state of the door 220 as a closed state when the S pole end faces the direction in which the Hall sensor 242 is located, and the sensed voltage value V _S is greater than or equal to the second open reference value V _D2 . (S1050).

As described above, in the dishwasher 200 according to an embodiment of the present invention, the controller detects the voltage value V _S output by the hall sensor 242 and the first open reference value V _D1 or the second open reference value ( Since the state of the door 220 is determined by comparing V _D2 , there is an advantage in that the current state of the door 220 can be determined even when the door 220 is still.

Returning again to FIG. 8 , after determining the state of the door 220 , the controller determines whether the state of the door 220 is the closed state ( S830 ).

If the state of the door 220 is an open state rather than a closed state, the controller returns to the step S820 of determining the state of the door 220 again. This is because, when the door 220 is in an open state, the user does not apply an external force to the door 220 to open the door 220 .

Then, when the door 220 is in the closed state, the controller determines whether pressure is applied to the door 220 (S840). At this time, the pressure applied to the door 220 is the pressure generated by the user applying an external force through the front of the door 220 to open the door 220, the pressure generated when an object flies from the outside and collides with the door 220, It may be various types of pressure, such as pressure generated by the user leaning against the door 220 .

At this time, when the pressure is not applied to the door 220 , the controller returns to the step S820 of determining the state of the door 220 again. This is because, even when the door 220 is closed, the user may open the door 220 through a method other than the method of opening the door 220 by applying an external force through the front surface of the door 220 .

Then, the controller calculates a detection time Δt when pressure is applied to the door 220 (S850).

A method for the controller to determine whether pressure is applied to the door 220 and a method for calculating the detection time Δt may be described in more detail with reference to the graph of FIG. 11 .

11 is a graph for explaining a detection time used for an operation of a dishwasher according to an embodiment of the present invention.

Referring to FIG. 11 , when pressure is applied to the door 220 and then released, a graph showing a change in the difference value (ΔV) between the detection voltage value (V _S ) and the detection reference value (V _SR ) over time can be checked.

Here, the detection reference value (V _SR ) is the detection voltage value (V _S ) output by the hall sensor 242 when the door 220 is closed and no force is applied to the door 220, and the detection reference value ( V _SR ) is whether which end of the magnet 241 faces the direction in which the Hall sensor 242 is located, the magnitude of the magnetic field generated by the magnet 241, the magnetic field sensing sensitivity of the Hall sensor 242, the magnet 241 ) and the hall sensor 242 may be set differently depending on the initial separation distance.

Referring to the graph, when pressure is applied to the door 220 , the sensed voltage value V _S changes, so the difference ΔV between the sensed voltage value V _S and the sensed reference value V _SR increases. And when the pressure applied to the door 220 is released, the detection voltage value (V _S ) approaches the detection reference value (V _SR ), so the difference value (ΔV) between the detection voltage value (V _S ) and the detection reference value (V _SR ) is will decrease

By checking the difference ΔV between the sensing voltage value V _S and the sensing reference value V _SR , it can be determined whether pressure is applied to the door 220 .

The controller calculates a difference value (ΔV) between the detection voltage value (V _S ) and the detection reference value (V _SR ), and the difference value (ΔV) between the detection voltage value (V _S ) and the detection reference value (V _SR ) is the first determination If the reference value (V _R1 ) or more, it may be determined that pressure is applied to the door 220 . In this case, the first determination reference value V _R1 is a reference value for determining whether pressure is applied to the door 220 . This first determination reference value V _R1 may be set based on an initial separation distance between the magnet 241 and the Hall sensor 242 . For example, the first determination reference value (V _R1 ) is the initial separation distance between the magnet 241 and the Hall sensor 242 is 10 mm, the detection module 240 , and the initial separation between the magnet 241 and the Hall sensor 242 . The distance may be set differently in the sensing module 240 having a distance of 8 mm.

And the controller determines whether the difference value (ΔV) between the detection voltage value (V _S ) and the detection reference value (V _SR ) reaches the maximum value (V _max ), and the detection voltage value (V _S ) and the detection reference value (V _SR ) When the difference value ΔV of ΔV decreases by more than the second determination reference value V _R2 than the maximum value V _max , it is determined that the pressure applied to the door 220 is released. In this case, the second determination reference value V _R2 is a reference value for determining whether the pressure applied to the door 220 is released. Such a second determination reference value V _R2 may be set based on an initial separation distance between the magnet 241 and the Hall sensor 242 . For example, the second determination reference value (V _R2 ) is the initial separation distance between the magnet 241 and the Hall sensor 242 is 10 mm, the detection module 240 , and the initial separation between the magnet 241 and the Hall sensor 242 . The distance may be set differently in the sensing module 240 having a distance of 8 mm.

The controller controls the detection voltage value (V _S ) and the detection reference value (V _SR ) from the time when the difference value (ΔV) between the detection voltage value (V _S ) and the detection reference value (V _SR ) is equal to or greater than the first determination reference value (V _R1 ) A time until the difference value ΔV is decreased by the second determination reference value V _R2 from the maximum value V _max may be calculated as the detection time. The detection time Δt is the time when pressure is applied to the door 220, and whether the pressure applied to the door 220 is the pressure generated by the user applying an external force through the front of the door 220 to open the door 220 It is the standard value for judging

And if the pressure applied to the door 220 is the pressure generated by the user applying an external force through the front of the door 220 to open the door 220, the delay time t _d after the pressure is released The rear door 220 may be switched from a closed state to an open state. More details on this will be described later with reference to FIG. 12 .

Returning to FIG. 8 again, the controller calculates the detection time Δt, and then adjusts the state of the door 220 based on whether a washing operation is performed and the detection time Δt ( S860 ). In other words, when the pressure applied to the door 220 is the pressure generated by the user applying an external force through the front of the door 220 to open the door 220, the controller switches the state of the door 220 to the open state. , the determination criterion may be different depending on whether the cleaning operation is performed.

A more detailed method by which the controller adjusts the state of the door 220 based on whether the washing operation is performed and the detection time Δt may be described in more detail with reference to FIG. 12 .

12 is a flowchart illustrating a method in which the dishwasher adjusts the state of a door based on whether a washing operation is performed and a detection time according to an embodiment of the present invention.

Referring to FIG. 12 , the controller determines whether the dishwasher 200 is performing a washing operation (S1210).

When it is determined that the dishwasher 200 is not performing the washing operation, the controller determines whether the detection time Δt is equal to or greater than the first reference time t _R1 ( S1220 ). In this case, the first reference time t _R1 is short such that the pressure applied to the door 220 when the dishwasher 200 is not performing the washing operation is as short as the pressure generated when an object flies from the outside and collides with the door 220 . Time It is the time that is the criterion for judging whether the pressure is applied instantaneously.

Therefore, if the detection time Δt is less than the first reference time t _R1 , the controller determines that the pressure applied to the door 220 is noise applied for a short time and maintains the door 220 in the closed state (S1270) .

And, if the sensing time Δt is equal to or greater than the first reference time t _R1 , the controller determines whether the sensing time Δt is equal to or greater than the second reference time t _R2 ( S1230 ). In this case, the second reference time t _R2 is the pressure applied for a long time, such as the pressure applied to the door 220 when the dishwasher 200 is not performing the washing operation, such as the pressure generated by the user leaning on the door 220 . It is the time that serves as a criterion for judging whether or not

Therefore, when the detection time Δt is equal to or greater than the second reference time t _R2 , the controller determines that the pressure applied to the door 220 is noise applied for a long time and maintains the door 220 in the closed state (S1270) . And when the detection time Δt is less than the second reference time t _R2 , the controller changes the door 220 to the open state ( S1260 ).

That is, the controller opens the door 220 when the detection time Δt is greater than or equal to the first reference time t _R1 and less than the second reference time t _R2 when the dishwasher 200 is not performing the washing operation. It is changed to the open state, and when the detection time Δt is less than the first reference time t _R1 or greater than the second reference time t _R2 , the door 220 is maintained in the closed state.

Also, when it is determined that the dishwasher 200 is performing the washing operation, the controller determines whether the detection time Δt is equal to or greater than the third reference time t _R3 ( S1240 ). In this case, the third reference time t _R3 is a short time such as the pressure applied to the door 220 while the dishwasher 200 is performing a washing operation, such as pressure generated when an object flies from the outside and collides with the door 220 . It is the standard time to judge whether the pressure is momentarily applied.

Therefore, when the detection time Δt is less than the third reference time t _R3 , the controller determines that the pressure applied to the door 220 is noise applied for a short time and maintains the door 220 in the closed state (S1270) .

And, if the sensing time Δt is equal to or greater than the third reference time t _R3 , the controller determines whether the sensing time Δt is equal to or greater than the fourth reference time t _R4 ( S1250 ). In this case, the fourth reference time t _R4 is whether the pressure applied to the door 220 while the dishwasher 200 is performing a washing operation is the pressure applied for a long time, such as the pressure generated by the user leaning on the door 220 . It is a time to be judged.

Therefore, if the detection time Δt is equal to or greater than the fourth reference time t _R4 , the controller determines that the pressure applied to the door 220 is noise applied for a long time and maintains the door 220 in the closed state (S1270) . And, when the detection time Δt is less than the fourth reference time t _R4 , the controller changes the door 220 to the open state ( S1260 ).

That is, when the detection time Δt is greater than or equal to the third reference time t _R3 and less than the fourth reference time t _R4 when the dishwasher 200 is performing a washing operation, the controller opens the door 220 state, and if the detection time Δt is less than the third reference time t _R3 or greater than the fourth reference time t _R4 , the door 220 is maintained in the closed state.

In this case, the third reference time (t _R3 ) is a time exceeding the first reference time (t _R1 ) and less than the second reference time (t _R2 ), and the fourth reference time (t _R4 ) is the second reference time (t _R2 ) It may be more than one hour. For example, the first reference time t _R1 is 0.5 s, the second reference time t _R2 is 1 s, the third reference time t _R3 is 0.7 s, and the fourth reference time t _R4 is 1 s can

In this case, when the user presses the door 220 of the dishwasher 200 for 0.5 s or more and less than 1 s when the dishwasher 200 is not performing the washing operation, the controller opens the door 220 switch to And when the dishwasher 200 is performing a washing operation, if the user presses the door 220 of the dishwasher 200 for a period of 0.7 s or more and less than 1 s, the controller switches the door 220 to an open state. . That is, when the dishwasher 200 is performing the washing operation, the minimum detection time Δt for switching the door 220 to the open state increases compared to when the washing operation is not being performed. Therefore, in the dishwasher 200 according to an embodiment of the present invention, it is possible to reduce safety accidents that may occur when the door 220 is changed to an open state due to noise applied for a short time during a washing operation.

In this case, the third reference time (t _R3 ) is a time exceeding the first reference time (t _R1 ) and less than the second reference time (t _R2 ), and the fourth reference time (t _R4 ) is the second reference time (t _R2 ) or longer, the difference between the third reference time (t _R3 ) and the first reference time (t _R1 ) may be the same as the difference between the fourth reference time (t _R4 ) and the second reference time (t _R2 ) there is. For example, the first reference time (t _R1 ) is 0.5s, the second reference time (t _R2 ) is 1s, the third reference time (t _R3 ) is 0.7s, and the fourth reference time (t _R4 ) is 1.2s can be

In this case, when the user presses the door 220 of the dishwasher 200 for 0.5 s or more and less than 1 s when the dishwasher 200 is not performing the washing operation, the controller opens the door 220 switch to And while the dishwasher 200 is performing a washing operation, if the user presses the door 220 of the dishwasher 200 for a period of 0.7 s or more and less than 1.2 s, the controller switches the door 220 to an open state. do. That is, when the dishwasher 200 is performing the washing operation, the detection time Δt for switching the door 220 to the open state increases compared to when the washing operation is not being performed.

In this case, the pressure applied for a long time, such as the pressure generated by the user leaning on the door 220 , is generally much longer than the second reference time t _R2 . Therefore, even if the fourth reference time t _R4 is greater than the second reference time t _R2 by the difference between the third reference time t _R3 and the first reference time t _R1 , the noise applied for a long time The possibility of a safety accident that may occur because the door 220 is changed to an open state is low.

Accordingly, in the dishwasher 200 according to an embodiment of the present invention, the controller increases the detection time Δt for changing the door 220 to the open state, but the detection time for changing the door 220 to the open state By making the range of (Δt) the same, a safety accident that may occur when the door 220 is changed to an open state due to noise applied for a short time is reduced, and at the same time, by reducing the range of the detection time (Δt), the user It is possible to reduce the disadvantage that it is difficult to switch the door 220 to the open state.

At this time, when the dishwasher 200 is performing a washing operation, when the detection time Δt is greater than or equal to the third reference time t _R3 and less than the fourth reference time t _R4 , the door 220 is opened in an open state. When another condition is additionally satisfied without immediately switching, a method of switching the door 220 to the open state may be used. This can be explained in more detail with reference to FIG. 13 .

13 is a flowchart illustrating another method of adjusting a state of a door based on a detection time when the dishwasher is performing a washing operation according to an embodiment of the present invention.

Referring to FIG. 13 , the dishwasher 200 is performing a washing operation ( S1310 ).

At this time, the controller determines whether the detection time Δt is equal to or greater than the third reference time t _R3 (S1320). When the detection time Δt is less than the third reference time t _R3 , the controller determines that the pressure applied to the door 220 is noise applied for a short time and maintains the door 220 in the closed state ( S1380 ).

If the sensing time Δt is equal to or greater than the third reference time t _R3 , the controller determines whether the sensing time Δt is equal to or greater than the fourth reference time t _R4 ( S1330 ). When the detection time Δt is equal to or greater than the fourth reference time t _R4 , the controller determines that the pressure applied to the door 220 is noise applied for a long time and maintains the door 220 in the closed state ( S1380 ).

When the detection time Δt is less than the fourth reference time t _R4 , the controller increases the number of door open inputs by one ( S1340 ). Then, the controller determines whether the number of door open input is N times (N is a natural number equal to or greater than 2) (S1350). The number of times of door opening input means the number of times that the user has to apply pressure to the door to open the door 220 when the dishwasher 200 is operating.

If the number of door open input is not N, the controller maintains the door 220 in the closed state (S1380). If the number of times of door open input is N, the controller changes the door to the open state (S1360). Then, the controller changes the number of door open input to 0 (S1370).

As described above, in the dishwasher 200 according to an embodiment of the present invention, when the washing operation is in progress, the detection time Δt is greater than or equal to the third reference time t _R3 and less than the fourth reference time t _R4 and at the same time the door By changing the door 220 to the open state only when the number of open inputs is N, it is possible to reduce safety accidents that may occur because the door is changed to the open state due to an external force incorrectly applied during the washing operation.

Referring back to FIG. 12 , although not shown in the flowchart of FIG. 12 , the controller may notify the user through the notification module whether the pressure applied through the door 220 is normal or abnormal.

The notification module is a device capable of outputting a notification to the user, and may be an LED, a buzzer, or the like.

When the dishwasher 200 is not performing the washing operation, the controller controls the notification module to output a normal notification when the detection time Δt elapses the first reference time t _R1 , then the normal notification is output and Even after the pressure is maintained, a warning notification may be output when the detection time Δt is equal to or greater than the second reference time t _R2 .

In addition, the controller controls the notification module to output a normal notification when the detection time Δt elapses when the third reference time t _R3 elapses while the dishwasher 200 is performing a washing operation, and then a normal notification is output. Even after the pressure is maintained, a warning notification may be output when the detection time Δt is equal to or greater than the fourth reference time t _R4 .

In this case, the normal notification is a notification indicating that the pressure applied to the door 220 may be pressure generated by the user applying an external force through the front of the door 220 to open the door 220 . The warning notification is a notification indicating that pressure is being applied to the door 220 for a long time.

As described above, the dishwasher according to an embodiment of the present invention may notify whether the pressure applied to the door 220 by the user is normal through the notification module.

When the conditions described with reference to FIGS. 12 and 13 are satisfied, the controller may change the door 220 of the dishwasher 200 to an open state. In this case, a method for the controller to change the door 220 to the open state may be described in more detail with reference to FIGS. 14 and 15 .

14 is a flowchart illustrating a method of changing a door to an open state according to a temperature of a washing room by the dishwasher according to an embodiment of the present invention.

Referring to FIG. 14 , the controller determines whether the temperature T _D of the washing chamber 211 is equal to or greater than the reference temperature T _R ( S1410 ). In this case, the controller may receive the temperature T _D of the washing chamber 211 from the temperature sensor.

The temperature sensor is a device that detects the temperature T _D of the washing chamber 211 , and may sense the temperature T _D of the washing chamber 211 inside the washing chamber 211 and transmit it to the controller.

The reference temperature T _R is a reference temperature for determining whether there is a risk of causing a safety accident to a user when steam or the like inside the washing chamber 211 is discharged to the outside of the dishwasher 200 .

When the temperature T _D of the washing chamber 211 is less than the reference temperature T _R , the controller determines whether a first delay time t _d1 has elapsed ( S1420 ). In this case, the first delay time t _d1 is a waiting time before the controller changes the door 220 to an open state after the pressure applied to the door 220 is released. By setting the first delay time t _d1 as described above, it is possible to prevent a safety accident that may occur when the door 220 is suddenly opened.

When it is determined that the first delay time t _d1 has not elapsed, the controller determines again whether the first delay time t _d1 has elapsed ( S1420 ). And when it is determined that the first delay time t _d1 has elapsed, the controller changes the door 220 to the open state (S1440).

When the temperature T _D of the washing chamber 211 is equal to or greater than the reference temperature T _R , the controller determines whether a second delay time t _d2 has elapsed ( S1430 ). At this time, the second delay time (t _d2 ) is a time that the controller waits before changing the door 220 to an open state after the pressure applied to the door 220 is released. It is a time longer than the first delay time (t _d1 ) am. By setting the second delay time t _d2 to be longer than the first delay time t _d1 , the operation of lowering the temperature T _D inside the washing chamber 211 for the second delay time t _d2 is executed. Time can be secured, and a safety accident that may occur due to the sudden opening of the door 220 when the temperature T _D inside the washing chamber 211 is high can be more effectively prevented.

When it is determined that the second delay time t _d2 has not elapsed, the controller determines again whether the second delay time t _d2 has elapsed (S1430). And when it is determined that the second delay time t _d2 has elapsed, the controller changes the door 220 to the open state (S1440).

As such, in the dishwasher 200 according to an embodiment of the present invention, when the temperature T _D inside the washing chamber 211 is equal to or greater than the reference temperature T _R , the second delay time t _d1 is longer than the first delay time t d1 . By changing the door 220 to the open state after the delay time t _d2 has elapsed, a safety accident that may occur when the door 220 is suddenly opened when the temperature T _D inside the washing chamber 211 is high can prevent

15 is a flowchart illustrating a method of changing a door to an open state according to a temperature of a washing room by a dishwasher according to another embodiment of the present invention.

Referring to FIG. 15 , the controller determines whether the temperature T _D of the washing chamber 211 is equal to or greater than the reference temperature T _R ( S1510 ).

When the temperature T _D of the washing chamber 211 is less than the reference temperature T _R , the controller determines whether a first delay time t _d1 has elapsed ( S1520 ).

When it is determined that the first delay time t _d1 has not elapsed, the controller determines again whether the first delay time t _d1 has elapsed ( S1520 ). And when it is determined that the first delay time t _d1 has elapsed, the controller changes the door 220 to the open state (S1540).

When the temperature T _{D of the washing chamber 211 is equal to or greater than the reference temperature T R , the controller determines whether the temperature T D of the washing chamber 211 is less than the reference temperature T R ( S1530} ). When it is determined that the temperature T _D of the washing chamber 211 is not less than the reference temperature T _R , the controller determines whether the temperature T _D of the washing chamber 211 is less than the reference temperature T _R again. It is determined (S1530). And when it is determined that the temperature T _D of the washing chamber 211 is less than the reference temperature T _R , the controller changes the door 220 to the open state ( S1540 ).

As such, the controller does not change the door 220 to the open state if the temperature T _D of the washing chamber 211 does not become less than the reference temperature T _R due to the cause such as the end of the washing operation performed at high temperature. Accordingly, it is possible to more effectively prevent a safety accident that may occur when the door 220 is suddenly opened when the temperature T _D inside the washing chamber 211 is high.

As such, in the dishwasher 200 according to an embodiment of the present invention, when the temperature T _D inside the washing chamber 211 is equal to or higher than the reference temperature T _R , the temperature T _D inside the washing chamber 211 is By changing the door 220 to the open state after is less than the reference temperature ( _TR ), safety that can occur by suddenly opening the door 220 when the temperature (T _D ) inside the washing chamber 211 is high accidents can be prevented.

As described above, the dishwasher 200 according to an embodiment of the present invention changes the door 220 to the open state based on the detection time Δt, so that the door 220 is not opened when the user does not want it. . At this time, when the dishwasher 200 according to an embodiment of the present invention is performing a washing operation, if the detection time Δt is less than the third reference time t _R3 or greater than the fourth reference time t _R4 , the door Since 220 is maintained in the closed state, it is possible to reduce a safety accident that may occur due to the door 220 being changed to the open state due to an erroneously applied external force during the washing operation. In addition, the dishwasher 200 according to an embodiment of the present invention compares the temperature T _D and the reference temperature T _R of the washing chamber 211 and adjusts the timing of changing the door to the open state. (200) When the internal temperature T _D is high, the door 220 is changed to an open state, thereby reducing safety accidents that may occur.

As described above, the present invention has been described with reference to the illustrated drawings, but the present invention is not limited by the embodiments and drawings disclosed in this specification, and various methods can be obtained by those skilled in the art within the scope of the technical spirit of the present invention. It is obvious that variations can be made. In addition, although the effects according to the configuration of the present invention have not been explicitly described and described while describing the embodiments of the present invention, it is natural that the effects predictable by the configuration should also be recognized.

200: dishwasher 205: outer case
210: tub 211: washing room
220: door 230: gasket
240: sensing module 241: magnet
242: hall sensor 243: shaft
244: case 245: spring
251, 252: Rack 261, 262, 263: Nozzle
270: washing water supply 280: latch

Claims (17)

a tub having an open surface and forming a washing chamber in which the object to be washed is accommodated;
a door for opening and closing one surface of the tub;
a gasket sealing the tub and the door and having elasticity;
A magnet disposed on one side of the edge of one side of the tub and installed to be spaced apart from a magnet that moves as pressure is applied to the door, and detects a magnetic field change according to the movement of the magnet, and detects a change in the magnetic field a sensing module including a Hall sensor outputting a voltage value; and
Determines the state of the door based on the sensed voltage value output from the sensing module, calculates a sensing time of the pressure applied to the door based on the sensed voltage value, and determines whether a cleaning operation is performed and the sensing time to include a controller for controlling the state of the door
dish washer.
The method of claim 1,
The detection module is disposed on one side of the edge connected to the upper surface of the tub among the edge of one surface of the tub
dish washer.
The method of claim 1,
The detection module is
a shaft having a magnet disposed at one end, and moving together with the magnet when pressure is applied to the door;
a case accommodating the magnet, the Hall sensor, and the shaft, the case having a path through which the shaft moves; and
and a spring disposed between the shaft and the Hall sensor.
dish washer.
4. The method of claim 3,
The center of the shaft, the center of the magnet, and the center of the Hall sensor are located in a straight line.
dish washer.
4. The method of claim 3,
When pressure is applied to the door, the shaft moves in the direction in which the Hall sensor is located, and when the pressure applied to the door is released, the shaft moves to the initial position by the elastic force of the spring and the gasket.
dish washer.
The method of claim 1,
The controller compares the sensing voltage value at the time of initial driving with the polarity reference value, and if the sensing voltage value at the time of the initial driving is less than the polarity reference value, it is determined that the N-pole end of the magnet faces the direction in which the Hall sensor is located, It is determined that the S pole end of the magnet faces the direction in which the Hall sensor is located if the sensing voltage value during the initial driving is greater than or equal to the polarity reference value
dish washer.
7. The method of claim 6,
When the controller determines that the N-pole end of the magnet faces in the direction in which the Hall sensor is located, the controller compares a first open reference value with the sensed voltage value, and if the sensed voltage value is greater than or equal to the first open reference value, the door state is determined as the open state, and when the sensed voltage value is less than the first open reference value, the door state is determined as the closed state,
When the controller determines that the S pole end of the magnet faces the direction in which the Hall sensor is located, the controller compares a second opening reference value with the detection voltage value, and when the detection voltage value is less than the second opening reference value, the door state is determined as an open state, and when the sensed voltage value is greater than or equal to the second open reference value, determining the state of the door as a closed state
dish washer.
The method of claim 1,
The controller calculates a difference value between the detection voltage value and the detection reference value, and if the difference between the detection voltage value and the detection reference value is greater than or equal to a first determination reference value, the controller determines that pressure is applied to the door, and the detection voltage value and the detection It is determined whether the difference value between the reference values reaches the maximum value, and when the difference value between the detection voltage value and the detection reference value decreases by more than a second determination reference value from the maximum value, it is determined that the pressure applied to the door is released
dish washer.
9. The method of claim 8,
The controller is the detection time from a time when the difference value between the detection voltage value and the detection reference value is equal to or greater than the first determination reference value to the time when the difference value between the detection voltage value and the detection reference value is reduced by a second determination reference value from the maximum value calculating
dish washer.
The method of claim 1,
The controller changes the door to the open state when the detection time is longer than the first reference time and less than the second reference time when the dishwasher is not performing a washing operation, and the detection time is less than the first reference time or if it is longer than the second reference time, maintaining the door in a closed state,
The controller changes the door to an open state when the detection time is longer than or equal to the third reference time and less than the fourth reference time when the dishwasher is performing a washing operation, and the detection time is less than the third reference time or to maintain the door in a closed state if it is longer than the fourth reference time
dish washer.
11. The method of claim 10,
The third reference time is a time exceeding the first reference time and less than the second reference time,
The fourth reference time is a time equal to or longer than the second reference time.
dish washer.
12. The method of claim 11,
The difference between the third reference time and the first reference time is the same as the difference between the fourth reference time and the second reference time.
dish washer.
11. The method of claim 10,
The controller increases the number of door open inputs by one time when the detection time is longer than the third reference time and less than the fourth reference time when the dishwasher is performing a washing operation, and the detection time is the third reference time If it is less than or equal to or longer than the fourth reference time, maintaining the door in a closed state,
The controller converts the door to an open state when the number of door open input is N times (N is a natural number greater than or equal to 2), and changes the door open input number to 0
dish washer.
11. The method of claim 10,
Further comprising a notification module for outputting a notification based on the command received from the controller,
The controller controls the notification module to output a normal notification when the detection time is equal to or longer than the first reference time when the dishwasher is not performing a washing operation, and the detection time is longer than or equal to the second reference time. When the notification module is controlled to output a warning notification,
The controller controls the notification module to output a normal notification when the detection time is equal to or longer than the third reference time while the dishwasher is performing a washing operation, and the detection time is longer than or equal to the fourth reference time. to control the notification module to output a warning notification when
dish washer.
11. The method of claim 10,
The controller is configured to change the door to the open state after a first delay time elapses when changing the door to the open state.
dish washer.
16. The method of claim 15,
Further comprising a temperature sensor for sensing the temperature of the washing room,
When the controller changes the door to the open state, if the temperature of the washing chamber sensed by the temperature sensor is equal to or higher than a reference temperature, the controller opens the door after a second delay time longer than the first delay time elapses to change to
dish washer.
16. The method of claim 15,
Further comprising a temperature sensor for sensing the temperature of the washing room,
After the controller determines to change the door to the open state, if the temperature of the washing chamber sensed by the temperature sensor is equal to or greater than a reference temperature, the controller opens the door after the temperature of the washing chamber becomes less than the reference temperature change to state
dish washer.

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