Method for controlling dishwasher

Abstract

A dishwasher comprises a tub constructed to accommodate therein dishes; a spray arm disposed in the tub and configured to spray washing water to the dishes, wherein the spray arm includes a plurality of spray arms positioned at different positions; a compressor for compressing refrigerant; a condenser fluid-communicating with the compressor, wherein heat exchange between the washing water and the refrigerant occurs while washing water and the refrigerant flow separately in the condenser; and a washing pump fluid-communicating with the condenser and configured to transfer the washing water. A method for controlling the dishwasher comprises: measuring an operation value generated under an operation of at least one of the compressor or the washing pump; comparing the operation value with a set value; and in response to that the operation value exceeds the set value, determining that at least one of the compressor or the spray arm is clogged with foreign substances.

Description

CROSS-REFERENCE TO RELATED APPLICATION

[0001] This application claims priority to and benefit of Korean Patent Applications No. 10-2025-0024363 filed on Feb. 25, 2025, 10-2025-0032609 filed on Mar. 13, 2025, 10-2025-0042750 filed on Apr. 2, 2025, 10-2025-0091203 filed on Jul. 7, 2025, and 10-2025-0141395 filed on Sep. 29, 2025, which are hereby incorporated by reference as if fully set forth herein.BACKGROUNDField

[0002] The present disclosure relates to a method for controlling a dishwasher, and more particularly, to a method for controlling a dishwasher equipped with a heat pump system for heating washing water.Description of Related Art

[0003] Content described in this section merely provides background information on the present disclosure and does not constitute the prior art.

[0004] A dishwasher is an apparatus that uses detergent and washing water to wash food residues such as food scraps on dishes or cookware.

[0005] A general dishwasher comprises a tub providing a washing space, a rack disposed in the tub and accommodating therein dishes, a spray arm spraying the washing water to the rack, a sump storing therein the washing water, and a pump supplying the washing water stored in the sump to the spray arm.

[0006] A temperature of the washing water used in the dishwasher may be room temperature. However, washing efficiency may be improved and a washing time may be reduced by using high-temperature washing water. Accordingly, washing or rinsing of the dishes may be performed using the high-temperature washing water in at least a portion of an operation process of the dishwasher.

[0007] A heating device for heating the washing water may be provided as, for example, an electric heater, a heat pump system, or the like.

[0008] Since the heat pump system has higher energy efficiency compared to the electric heater, a case in which a washing water heating scheme using the heat pump system is introduced into the dishwasher is increasing recently.

[0009] The heat pump system may be provided with a condenser that heats the washing water by exchanging heat between the high-temperature refrigerant and the relatively low-temperature washing water. The washing water may be heated to a high temperature while flowing through the condenser.

[0010] The refrigerant and the washing water may flow in the condenser in a removed manner from each other and. Accordingly, heat is transferred from the high-temperature refrigerant to the washing water, so that the refrigerant may be condensed while the washing water may be heated. In order to increase a size of an interface between the washing water and the refrigerant, that is, the heat exchange area therebetween, the flow path of the washing water may be composed of a plurality of tubes.

[0011] Since the plurality of tubes are disposed in the condenser, the washing water may flow to one tube having a large diameter and then to a tube having a small diameter. When the diameter of the tube is relatively small, clogging may occur therein.

[0012] The washing water flowing through the tube may circulate through the dishwasher under an operation of a washing pump. For this reason, when dishes washing is performed, foreign substances attached to the surface of the dish and removed therefrom using the washing water may be contained in the circulating washing water.

[0013] When the washing water containing the foreign substance is introduced into the tube of the small diameter, the foreign substance contained in the wash water may be attached to the inner surface of the tube without exiting the tube. When this circulation of the washing water continues, the amount of foreign substance adhering to the inner surface of the tube may continue to increase.

[0014] Therefore, when the dishwasher is continuously used, the foreign substances continue to accumulate inside the tube, which may lead to poor flow of the washing water in the condenser. When this phenomenon continues, at least some tubes may be blocked, and the flow of the washing water may deteriorate more rapidly.

[0015] This may result in damage to the condenser, poor operation of the dishwasher, and in severe cases, the operation of the dishwasher may be stopped.

[0016] Accordingly, there is a need to develop a control method for detecting the accumulation of the foreign substances in the condenser. In addition, it is necessary to develop a method for removing the foreign substances from the condenser in response to that it is detected that the foreign substances are accumulated in the condenser.

[0017] Likewise, the foreign substances may accumulate in a spray arm that sprays washing water onto the dishes. Thus, it is necessary to develop a method for detecting the accumulation of the foreign substances in the spray arm and removing the foreign substances from the spray arm.SUMMARY

[0018] A technical purpose of the present disclosure is to provide a method for controlling a dishwasher having a structure for detecting accumulation of foreign substances in a spray arm or a condenser.

[0019] In addition, a technical purpose of the present disclosure is to provide a method for controlling a dishwasher having a structure for removing foreign substances from the spray arm or the condenser in response to that it is detected that the foreign substances are accumulated in the spray arm or the condenser.

[0020] In addition, a technical purpose of the present disclosure is to provide a method for controlling a dishwasher having a structure for detecting accumulation of foreign substances in the spray arm or the condenser and removing the foreign substances therefrom, without adding a separate device to the dishwasher.

[0021] Purposes according to the present disclosure are not limited to the above-mentioned purpose. Other purposes and advantages according to the present disclosure that are not mentioned may be understood based on following descriptions, and may be more clearly understood based on embodiments according to the present disclosure. Further, it will be easily understood that the purposes and advantages according to the present disclosure may be realized using means shown in the claims or combinations thereof.

[0022] The dishwasher according to an embodiment may comprise a tub in which dishes are accommodated.

[0023] The dishwasher may comprise a plurality of spray arms which are disposed in the tub, spray washing water, and are positioned at different positions.

[0024] The dishwasher may comprise a compressor that compresses the refrigerant.

[0025] The dishwasher may comprise a condenser in fluid-communication with the compressor. In the condenser, heat exchange between the washing water and the refrigerant may occur while washing water and the refrigerant flow separately therein.

[0026] The dishwasher may comprise a washing pump in fluid-communication with the condenser. The washing pump may transfer washing water.

[0027] In a dishwasher control method according to an embodiment, the controller may measure an operation value generated under at least one operation of the compressor or the washing pump.

[0028] Next, the controller may compare the operation value with the set value.

[0029] In response to that the operation value exceeds the set value, the controller may determine that at least one of the compressor or the spray arm is clogged with the foreign substance.

[0030] The dishwasher may comprise a switching valve configured to operate such that the washing water is selectively supplied to at least one of the plurality of spray arms.

[0031] Next, in response to that the operation value exceeds the set value, the controller may operate the switching valve to change the spray arm to which the washing water is to be supplied among the plurality of spray arms to which the washing water may be supplied.

[0032] Next, the controller may measure the operation value generated under the operation of at least one of the compressor or the washing pump after the change and compare the operation value measured after the change with the set value.

[0033] Next, in response to that the operation value is lower than or equal to the set value, the controller may issue an alarm or notification notifying that the spray arm is clogged with the foreign substance.

[0034] Next, in response to that the operation value exceeds the set value, the controller may issue an alarm or notification notifying that the condenser is clogged with the foreign substance.

[0035] The operation value may be an electrical current value applied to the washing pump.

[0036] In another embodiment, the operation value may be a temperature value at the refrigerant outlet of the compressor.

[0037] The controller may remove the foreign substances accumulated in the spray arm or the condenser.

[0038] In the step of removing the foreign substances accumulated in the spray arm or condenser, a RPM value of a motor provided in the washing pump may be increased.

[0039] In the method for controlling the dishwasher according to an embodiment, the operation value may be at least one of an electrical current value applied to the washing pump or a temperature value of the refrigerant outlet of the compressor.

[0040] The set value may be at least one of a first set value set with respect to an electrical current value applied to the washing pump or a second set value set with respect to a temperature value of a refrigerant outlet of the compressor.

[0041] When the operation value is an electrical current value applied to the washing pump, an alarm or notification may be issued in response to that a state in which the electrical current value exceeds the first set value is maintained for a set first time duration.

[0042] In the step of removing foreign substances accumulated in the spray arm or the condenser, the motor may operate for a set second time duration at the RPM value of the motor set as a third set value.

[0043] In response to that the electrical current value applied to the washing pump exceeds the first set value after the foreign substance removal operation is finished, the controller may operate the motor again for the second time duration at the RPM value of the motor set as the third set value.

[0044] In response to that the electrical current value applied to the washing pump exceeds the first set value after the operation of the motor for removing the foreign substances is finished, the controller may operate the motor for the second time duration at the RPM value of the motor set as the third set value again.

[0045] In this regard, in response to that the state in which the electrical current value exceeds the first set value is maintained for the first time duration, the motor may operate again.

[0046] In addition, after issuing the alarm or notification, the controller may operate the switching valve such that a flow path of the washing water is returned to a flow path to the spray arm before the change.

[0047] The method for controlling the dishwasher according to an embodiment may further comprise checking whether the foreign substances have been removed from the spray arm or the condenser. The method may further comprise: in response to that the foreign substances are not removed even though the removing of the foreign substances accumulated in the spray arm or the condenser and the checking of whether the foreign substances have been removed from the spray arm or the condenser are performed a predetermined number of times, issuing an alarm or notification of the removal failure to a user.

[0048] The effects of the present disclosure are as follows.

[0049] The method for controlling the dishwasher according to the present disclosure can effectively detect that the spray arm or the condenser is clogged with the foreign substances through the operation of each of an existing compressor, an existing washing pump, and the controller for controlling the same provided in the dishwasher without adding a separate device to the dishwasher, and notify a user of the detection. Accordingly, convenience may be provided to the user.

[0050] In addition, in the dishwasher control method according to the present disclosure, high-pressure washing water may be applied to the spray arm or a tube through which the washing water flows inside the condenser using the washing pump. Accordingly, foreign substances accumulated in the spray arm or the condenser may be effectively removed using the pressure of the washing water. Therefore, the dishwasher may automatically remove the foreign substances from the spray arm or the tube in the condenser busing the washing pump provided in the dishwasher without using a separate device. Accordingly, convenience may be provided to the user.

[0051] In addition, in the method for controlling the dishwasher according to the present disclosure, the dishwasher can sufficiently effectively remove the foreign substances from the condenser by repeating a process of removing the foreign substances from the spray arm or the condenser and a process of checking whether the foreign substances have been sufficiently removed from the spray arm or the condenser a plurality of times upon detection of the clogging of the condenser. Accordingly, convenience may be provided to the user.

[0052] In addition to the above-described effects, the specific effects of the present disclosure will be described together while explaining specific matters for carrying out the present disclosure.BRIEF DESCRIPTION OF DRAWINGS

[0053] FIG. 1 is a cross-sectional view of a dishwasher according to an embodiment.

[0054] FIG. 2 is a diagram for illustrating components disposed in a base in a dishwasher according to an embodiment.

[0055] FIG. 3 is a diagram illustrating a method for controlling a dishwasher according to an embodiment.

[0056] FIG. 4 is a flowchart illustrating a method of controlling a dishwasher according to an embodiment.

[0057] FIG. 5 is a block diagram illustrating a portion of a dishwasher according to an embodiment.

[0058] FIG. 6 is a flowchart illustrating a method for controlling a dishwasher according to another embodiment.

[0059] FIG. 7 is a flowchart illustrating a process of issuing an alarm or notification and removing foreign substances in the method for controlling the dishwasher.DETAILED DESCRIPTIONS

[0060] The above-mentioned purposes, features, and advantages will be described in detail later with reference to the attached drawings, so that those skilled in the art in the technical field to which the present disclosure belongs may easily practice the technical ideas of the present disclosure. In describing the present disclosure, when it is determined that a detailed description of the publicly known technology related to the present disclosure may unnecessarily obscure the gist of the present disclosure, the detailed description thereof will be omitted. Hereinafter, a preferred embodiment according to the present disclosure will be described in detail with reference to the attached drawings. In the drawings, identical reference numerals are used to indicate identical or similar components.

[0061] Although first, second, and the like are used to describe various components, these components are not limited by such terms. Such terms are only used to distinguish one component from another component, and unless specifically stated to the contrary, a first component may also be a second component.

[0062] Throughout the present document, unless otherwise stated, each component may be singular or plural.

[0063] As used herein, singular expressions comprise plural expressions, unless the context clearly dictates otherwise. In the present application, terms such as “composed of” or “comprise” should not be construed as necessarily including all of various components or steps described herein, and should be interpreted as being able to not including some of the components or the steps and further including additional components or steps.

[0064] Throughout the present disclosure, “A and / or B” means A, B, or A and B, unless otherwise specified, and “C to D” means C inclusive to D inclusive unless otherwise specified.

[0065] As used herein, terms such as “upper”, “lower”, “side”, etc. are used to refer to a portion, a direction, and the like of a dishwasher in a state where the dishwasher is generally installed.

[0066] FIG. 1 is a cross-sectional view of a dishwasher according to an embodiment. The dishwasher according to an embodiment may comprise a casing 11 defining an outer appearance of the dishwasher, a tub 12 in which dishes to be washed are accommodated, a door 20 provided on a front surface of the tub 12 to open and close the tub 12, and a sump 100 disposed under the tub 12 to store therein washing water.

[0067] The dishwasher may further comprise a plurality of spray arms 13, 14, and 15 disposed in the tub 12 and spraying the washing water, a filter 110 provided in the sump 100 and filtering washing water sprayed from at least one of the plurality of spray arms 13, 14, and 15 and recovered to the sump 100, a washing pump 150 transferring the washing water stored in the sump 100, and a switching valve 130 controlling selective flow of the washing water transferred under the operation of the washing pump 150 to at least one of the plurality of spray arms 13, 14, and 15.

[0068] The tub 12 may be formed in a hexahedral shape with an open front surface and may have a washing chamber 12a defined therein. A communication hole through which washing water flows into the sump 100 is formed in a bottom portion 12b of the tub 12. In the washing chamber 12a, a plurality of racks 16 and 17 in which a washing target is accommodated is disposed. The plurality of racks 16 and 17 may comprise a lower rack 16 disposed in a lower area of the washing chamber 12a and an upper rack 17 disposed in an upper area of the washing chamber 12a. The lower rack 16 and the upper rack 17 are arranged to be spaced apart from each other in an up-down direction, and may slide in the frontward direction of the tub 12 and extend from the tub 12.

[0069] The plurality of spray arms 13, 14, and 15 are arranged in the up-down direction. The plurality of spray arms 13, 14, and 15 may comprise a lower spray arm 13 disposed at the lowermost end and spraying the washing water in an upward direction toward the lower rack 16, an upper spray arm 14 disposed on top of the lower spray arm 13 and spraying the washing water upwardly toward the upper rack 17, and a top spray arm 15 disposed at the upper end of the washing chamber 12a and on top of the upper spray arm 14 and spraying the washing water downwardly.

[0070] The plurality of spray arms 13, 14, and 15 are supplied with the washing water from the washing pump 150 through a plurality of spray arm connection flow paths 18, 19, and 21. The plurality of spray arm connection flow paths 18, 19, and 21 may comprise a lower spray arm connection flow path 18 connected to the lower spray arm 13, an upper spray arm connection flow path 19 connected to the upper spray arm 14, and a top spray arm connection flow path 21 connected to the top spray arm 15.

[0071] The lower spray arm 13, the upper spray arm 14, and the top spray arm 15 may be supplied with the washing water from the washing pump 150 through the upper spray arm connection flow path 18, the upper spray arm connection flow path 19, and the top spray arm connection flow path 21, respectively.

[0072] The sump 100 may be disposed under the bottom portion12b of the tub 12 and may collect the washing water. The filter 110 may filter contaminants from the washing water flowing from the tub 12 to the sump 100.

[0073] The wash water sprayed through the plurality of spray arms 13, 14, and 15 along with the contaminants deposited on and removed from the washing target drops to the bottom portion 12b of the tub 12. Accordingly, the washing water containing the contaminants may be filtered while flowing through the filter 110 communicating with the bottom portion 12b of the tub 12 and thus the contaminants-free washing water may be stored in the sump 100.

[0074] During the washing operation, the washing water may wash the dishes accommodated in the racks 16 and 17 while circulating through the sump 100, the spray arms 13, 14, and 15, the tub 12, and the filter 110.

[0075] The washing pump 150 supplies the washing water stored in the sump 100 to at least one of the plurality of spray arms 13, 14, and 15. The washing pump 150 may comprise a washing motor that generates a rotational force, and an impeller that is rotated by the washing motor to transfer the washing water. The washing pump 150 may be connected to the switching valve 130 and a washing water supply flow path 180.

[0076] When the washing pump 150 operates, the washing water stored in the sump 100 may be introduced into the washing pump 150 through a water collection flow path 170 and then transferred to the switching valve 130 through the washing water supply flow path 180.

[0077] The switching valve 130 selectively supplies the washing water transferred under the operation of the washing pump 150 to at least one of the lower spray arm 13, the upper spray arm 14, and the top spray arm 15. The switching valve 130 may selectively connect the washing water supply flow path 180 to at least one of the plurality of spray arm connection flow paths 18, 19, and 21.

[0078] The sump 100 is connected to a water supply flow path 23 through which the washing water supplied from an external water source flows. A water supply valve 22 for controlling flow of the washing water supplied from the external water source may be provided in the water supply flow path 23. The water supply valve 22 may control supply of the washing water from the external water source to the sump 100. When the water supply valve 22 is opened, the washing water supplied from the external water source may be introduced into the sump 100 through the water supply flow path 23.

[0079] The sump 100 may be connected to a drain flow path 24 for draining the washing water to the outside out of the dishwasher. A drain pump 25 for draining the washing water in the sump 100 through the drain flow path 24 may be provided in the drain flow path 24. When the drain pump 25 operates, the washing water stored in the sump 100 may be drained to the outside out of the casing 11 through the drain flow path 24.

[0080] A heating device for heating the washing water may be provided inside the sump 100 or in the washing pump 150. The heating device may be provided as, for example, an electric heater, a heat pump system, or the like.

[0081] In an embodiment, the washing water may be heated using the heat pump system. Hereinafter, the heat pump system will be described first.

[0082] The heat pump system refers to a system that pumps heat from a low temperature environment into a high temperature environment. In this regard, the pumping of the heat may be implemented using, for example, a compressor 500. In an embodiment, the heat pump system may be implemented using a so-called two-phase flow refrigeration cycle that increases the temperature of the refrigerant by compressing the refrigerant flowing in two phases into a gaseous state using the compressor 500.

[0083] The heat pump system for performing the two-phase flow refrigeration cycle may comprise the compressor 500, a condenser 300, an expansion device, and an evaporator 600. These components are connected to each other through pipes. While the refrigerant is flowing and circulating these components, the phase thereof and the temperature thereof change, such that the refrigerant may absorb heat from the surroundings or emit the heat to the surroundings.

[0084] The refrigerant may be introduced into the compressor 500 in a low temperature gaseous state. The refrigerant may be compressed in the compressor 500. From a refrigerant outlet of the compressor 500, the refrigerant may be introduced into the condenser 300 in a super-heated gas state of the high temperature and high pressure.

[0085] The refrigerant and the washing water may flow separately in the condenser 300. The refrigerant may be introduced into the condenser 300 and exchange the heat with the washing water, and the washing water may be heated upon receiving the heat from the refrigerant.

[0086] The refrigerant may be phase-changed from the superheated gas state to a saturated state in which liquid and gas coexist while the refrigerant is maintained at theoretically the same pressure in the condenser 300.

[0087] The refrigerant flows into the condenser 300 in the superheated state and transfers the heat to the washing water such that the temperature of the refrigerant is lowered. Then, when the refrigerant reaches the saturated state, a proportion of the liquid therein may gradually increase while the refrigerant is maintained theoretically at the same temperature. In this liquefaction process, the refrigerant emits a large amount of latent heat of liquefaction, and the washing water may be heated upon receiving the heat.

[0088] The refrigerant from the condenser 300 may be introduced into the expansion device in the saturated liquid or a super cooled liquid state. Such an expansion device may be provided as, for example, an expansion valve or a capillary device.

[0089] The refrigerant may undergo an adiabatic expansion, i.e., an expansion in which the enthalpy is theoretically constant in the expansion device. In this expansion process, a portion of the refrigerant is vaporized, and accordingly, the pressure of the refrigerant may be lowered. As the portion of the refrigerant is vaporized to dissipate the heat of vaporization to the surroundings, the temperature of the entirety of the refrigerant may be lowered. That is, the refrigerant may be introduced into the evaporator 600 in a state of low temperature and low pressure obtained while flowing through the expansion device.

[0090] When the refrigerant is introduced into the evaporator 600, the proportion of gas in the refrigerant may gradually increase in the evaporator 600 while absorbing the heat from the relatively high temperature surroundings. In the evaporator 600, the proportion of the gas in the refrigerant may gradually increase while the refrigerant is maintained at theoretically the same pressure and the same temperature.

[0091] The refrigerant discharged from the evaporator 600 may be introduced into the compressor 500 in a state in which a small amount of liquid is present in the refrigerant or the refrigerant is slightly overheated. The refrigerant introduced into the compressor 500 may circulate through the compressor 500, the condenser 300, the expansion device, and the evaporator 600 while repeating the above-described process again.

[0092] Typically, a refrigeration apparatus uses a principle in which the refrigerant absorbs the heat in the evaporator 600. The heat pump system of an embodiment may use the heat released from the refrigerant in the condenser 300.

[0093] In the heat pump system, the heat exchange occurs between the high temperature refrigerant and the relatively low temperature washing water in the condenser 300, and thus the washing water may be heated. The high-temperature washing water heated by the condenser 300 may wash or rinse the dishes more easily than the washing water at room temperature.

[0094] In this regard, such a heat pump system does not always need to operate while the dishwasher is operating the washing or rinsing process. For example, when the washing or rinsing is performed using the washing water at the room temperature, the compressor 500 does not operate, so that the water at the room temperature may be sprayed to the dishes without heating the washing water.

[0095] Even when the compressor 500 is stopped and the washing water is not heated, the washing water may flow through the condenser 300 and circulate throughout the dishwasher.

[0096] In another embodiment, a bypass flow path bypassing the condenser 300 may be defined. Thus, when the compressor 500 is stopped, the washing water may flow along the bypass flow path to bypass the condenser, thereby improving the performance of the condenser 300 and extending its lifespan.

[0097] FIG. 2 is a diagram for illustrating components disposed in a base 30 in the dishwasher according to an embodiment. The components constituting the heat pump system may be disposed, for example, under the tub 12.

[0098] The dishwasher may comprise the base 30 disposed under the tub 12. The heat pump system and other devices for driving the dishwasher may be disposed in the base 30. The base 30 has an inner space defined therein positioned under the tub 12, and the inner space may act as a machine room in which various mechanical components are disposed.

[0099] The dishwasher may comprise a mounting portion 40 on which the condenser 300 is mounted. The mounting portion 40 may be disposed in the base 30. The mounting portion 40 may be disposed under the tub 12. The mounting portion 40 may be generally formed in a plate shape. Various components may be coupled to an upper surface of the mounting portion 40.

[0100] The mounting portion 40 may be disposed inside the base 30. The mounting portion 40 may be easily removed from the base 30. For example, the mounting portion 40 may be mounted to the base 30 using a fastening means. The fastening means may be unfastened, and the mounting portion 40 may move in a sliding manner as shown by arrows in FIG. 2 and thus may be removed from the base 30.

[0101] While the mounting portion 40 is guided by a guide rail formed on an inner side surface of the base 30, the mounting portion may slide to extend from the base 30.

[0102] The condenser 300 may be disposed on the mounting portion 40. The refrigerant and the washing water may flow in a separate manner in the condenser 300. The refrigerant may be condensed in the condenser 300. The refrigerant may be condensed to release latent heat of condensation such that the washing water may be heated by the heat released from the refrigerant.

[0103] Although not shown, the expansion valve may be disposed at an appropriate position of the mounting portion 40. Since a size of the expansion valve is smaller than a size of each of the other components constituting the heat pump system, the expansion value may be appropriately disposed on a spare space of the mounting portion 40.

[0104] The dishwasher may comprise a water softener 41 for producing soft water. The water softener 41 may be mounted on the mounting portion 40. The soft water is water that contains very little minerals such as calcium and magnesium, or does not contain the minerals such as calcium and magnesium. When washing the dishes using the soft water, the washing efficiency of the dishes may be improved, and the lifespan of the dishes may be increased. Therefore, it is necessary to wash the dishes using the soft water as needed.

[0105] In an embodiment, the washing water may be introduced into the water softener 41, and the water may be converted into the soft water using the water softener 41, and then the soft water may be used for dishwashing. However, the water softener 41 is not an essential component of the dishwasher.

[0106] The water softener 41 may communicate with the sump 100 through a pipe. Accordingly, the water introduced into the water softener 41 may be softened by the water softener 41. The soft water discharged from the water softener 41 may be introduced into the sump 100 and used for washing the dishes.

[0107] The dishwasher may comprise the sump 100 in which the washing water is stored. The sump 100 may be mounted on the mounting portion 40. The sump 100 may be disposed under the tub 12.

[0108] The washing water stored in the sump 100 may flow under an operation of the washing pump 150 and may wash the dishes accommodated in the tub 12 while circulating through the sump 100, the washing pump 150, the plurality of spray arms 13, 14, and 15, and the tub 12.

[0109] In this regard, the washing water is heated by the heat pump system and sprayed from the plurality of spray arms 13, 14, and 15 in a high temperature state to wash or rinse the dishes accommodated in the tub 12, thereby improving washing efficiency. In addition, the washing pump 150 may be mounted on the mounting portion 40.

[0110] In addition, the compressor 500 may be mounted on the mounting portion 40. The compressor 500 may communicate with the condenser 300. The compressor 500 compress the refrigerant. In addition, the evaporator 600 may be mounted on the mounting portion 40.

[0111] As described above, the compressor 500, the condenser 300, the expansion device, and the evaporator 600 constituting the heat pump system communicate with each other through pipes, and the refrigerant may undergo phase change such that the temperature and pressure thereof change while circulating through each of the components constituting the heat pump system.

[0112] Meanwhile, when the washing pump 150 operates, the washing water may sequentially flow through the washing pump 150, the condenser 300, the plurality of spray arms 13, 14, and 15, the tub 12, and the sump 100, and may be introduced into the washing pump 150 again and may circulate the above-described components again.

[0113] The refrigerant and the washing water may flow separately in the condenser 300. Accordingly, heat is transferred from the high-temperature refrigerant to the washing water, so that the refrigerant may be condensed while the washing water may be heated. In order to increase an area size of an interface between washing water and the refrigerant, that is, the heat exchange area therebetween, the flow path of the washing water may be composed of a plurality of tubes 320.

[0114] Since the plurality of tubes 320 are disposed in the condenser 300, the washing water may flow to one tube having a large diameter and then to the tube 320 having a small diameter. When the tube 320 has a relatively small diameter, clogging may occur in the tube 320 having the small diameter.

[0115] The washing water flowing through the tube 320 may circulate through the dishwasher under an operation of the washing pump 150. For this reason, when dishes washing is performed, the foreign substances attached to the surface of the dish and removed therefrom may be contained in the circulating washing water.

[0116] When the foreign substances contained in the washing water are introduced into the tube 320 having the small diameter, the foreign substances may not exit the tube 320 and may be attached to the inner surface of the tube 320. When the circulation process of the washing water continues, the amount of foreign substance adhering to the inner surface of the tube 320 may continue to increase.

[0117] Accordingly, when the dishwasher is continuously used, the foreign substances continue to accumulate inside the tube 320, which may deteriorate the flow of the washing water in the condenser 300. When this phenomenon continues, at least some of the tubes 320 may be blocked, and thus the flow of the washing water may deteriorate more rapidly.

[0118] As a result, damage to the condenser 300 may occur, the operation of the dishwasher may be deteriorated, and in severe cases, the operation of the dishwasher may be stopped.

[0119] Accordingly, there is a need to develop a control method for detecting the accumulation of foreign matters in the condenser 300. In addition, it is necessary to develop a method of removing the foreign substances from the condenser 300 in response to that it is detected that the foreign substances are accumulated in the condenser 300.

[0120] Hereinafter, a method of controlling a dishwasher with respect to such a structure will be described in detail with reference to the drawings.

[0121] FIG. 3 is a diagram showing a method for controlling a dishwasher according to an embodiment. FIG. 4 is a flowchart illustrating a method of controlling a dishwasher according to an embodiment. FIG. 5 is a block diagram illustrating a portion of a dishwasher according to an embodiment.

[0122] Referring to FIG. 5, a dishwasher according to an embodiment may comprise the compressor 500 for compressing the refrigerant.

[0123] A thermistor 501 may be provided at a refrigerant outlet of the compressor 500. The thermistor 501 may measure a temperature value of the refrigerant discharged from the compressor 500. That is, the thermistor 501 may measure a temperature value of the refrigerant outlet of the compressor 500.

[0124] The dishwasher may comprise the condenser 300 in fluid-communication with the compressor 500. In the condenser 300, heat exchange between the washing water and the refrigerant may occur while the washing water and the refrigerant flow separately therein.

[0125] The dishwasher may comprise the washing pump 150 in fluid-communication with the condenser 300. The washing pump 150 may transfer the washing water.

[0126] The refrigerant may be compressed in the compressor 500, circulate through the condenser 300, the expansion device 160, and the evaporator 600, and then be introduced into the compressor 500 again. Through this circulation process, the heat pump system may be implemented using the refrigerant, and a two-phase refrigerant flow refrigeration cycle may be implemented.

[0127] Meanwhile, the washing water may be pumped under the operation of the washing pump 150 so as to circulate through the condenser 300, the tub 12, and the sump 100, and then may be introduced into the pump again.

[0128] The heat exchange may be performed between the refrigerant and the washing water in the condenser 300. Accordingly, the washing water may be heated to become high-temperature water. Such high-temperature water may be sprayed from the spray arm to the dishes to easily clean the dishes accommodated in the tub 12.

[0129] In the condenser 300, the refrigerant and the washing water may flow separately from each other. In the condenser 300, the washing water may flow through a tube. In order to increase the heat exchange area of the washing water with the refrigerant, a plurality of tubes through which the washing water flows may be provided. The tubes may be spaced apart from each other.

[0130] Due to this structure, the flow cross-sectional area of each tube through which the washing water flows in the condenser 300 may be narrowed. Meanwhile, the foreign substances such as food waste may be contained in the washing water flowing through the condenser 300.

[0131] When the washing water flows in the narrow tube inside the condenser 300, the foreign substances may accumulate in the condenser 300. Accordingly, there is a need for a method for controlling the dishwasher that detects the accumulation of foreign substances in the condenser 300 to the extent that there is a great obstacle to the operation of the dishwasher and removes the foreign substances from the condenser 300.

[0132] Hereinafter, each step may be performed by a controller 1000 of the dishwasher. The controller 1000 may be configured to be electrically connected to the compressor 500, the thermistor 501, the switching valve 130, and the washing pump 150.

[0133] The controller 1000 may be configured to control the operation of the compressor 500. The controller 1000 may be configured to measure a temperature value of the refrigerant outlet of the compressor 500 using the thermistor 501 disposed at the refrigerant outlet of the compressor 500.

[0134] The controller 1000 may be configured to control the operation of the switching valve 130 to selectively control which of the plurality of spray arms 13, 14, and 15 the washing water is to be supplied to. For example, the controller 1000 may be configured to control the switching valve 130 to change the flow path of the washing water so that the washing water flow to the top spray arm 15 is changed to the washing water flow to the upper spray arm 14.

[0135] The controller 1000 may be configured to control the operation of the washing pump 150. The controller 1000 may be configured to measure an electrical current value applied to the washing pump 150 to operate the washing pump.

[0136] In the dishwasher control method according to an embodiment, the controller 1000 may be configured to measure an operation value generated under an operation of at least one of the compressor 500 or the washing pump 150 in S110.

[0137] Next, the controller 1000 may be configured to compare the measured operation value with a set value in S120.

[0138] In this regard, in response to that the operation value exceeds the set value, the controller 1000 may be configured to determine that at least one of the compressor 500 or the spray arm 13, 14, or 15 is clogged with the foreign substance. However, in detail, the following step may be performed to determine which of the compressor 500 or the spray arm 13, 14, or 15 is clogged therewith.

[0139] Next, in response to that the operation value exceeds the set value, the controller 1000 may be configured to operate the switching valve 130 to change the spray arm 13, 14, or 15 to which the washing water is to be supplied among the plurality of spray arms 13, 14, and 15 which the washing water may be supplied in S130.

[0140] In response to that the operation value exceeds the set value, it may be identified that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances. However, it is not known which one of the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances. For this reason, in order to know which one of the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances, the controller 1000 may be configured to operate the switching valve 130 to change the spray arm 13, 14, or 15 to which the washing water is to be supplied.

[0141] For example, when the top spray arm 15 is currently in operation and the operation value exceeds the set value, the controller 1000 may be configured to operate the switching valve 130 to block the pipe connected to the top spray arm 15 and allow the washing water to flow to the lower or upper spray arm 13 or 14.

[0142] Next, the controller 1000 may be configured to compare the operation value with the set value again in S140. Based on the comparing result of each of the operation value obtained before changing the spray arm 13, 14, or 15 to which the washing water is to be supplied and the operation value obtained by changing the spray arm 13, 14, or 15 to which the washing water is to be supplied with the set value, the controller may know which of the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances.

[0143] In response to that the operation value is lower than or equal to the set value, the controller 1000 may be configured to issue an alarm or notification notifying that the spray arm 13, 14, or 15 is clogged with the foreign substance in S150.

[0144] For example, in response to that the operation value exceeds the set value, the s witching valve 130 is operated to change the flow path of the washing water from the flow path to the top spray arm 15 to the flow path to the upper spray arm 14. Then, the operation value is measured. In response to that the measured operation value is lower than or equal to the set value, the controller may be configured to determine that the top spray arm 15 is clogged with the foreign substances. Accordingly, the controller 1000 may be configured to issue an alarm or notification indicating that the spray arm 13, 14, or 15, for example, the top spray arm 15, is clogged with the foreign substances.

[0145] In response to that the operation value exceeds the set value, the controller 1000 may be configured to issue an alarm or notification notifying that the condenser 300 is clogged with the foreign substance in S160.

[0146] For example, in response to that the operation value exceeds the set value, the s witching valve 130 is operated to change the flow path of the washing water from the flow path to the top spray arm 15 to the flow path to the upper spray arm 14. Then, the operation value is measured. The operation value still exceeds the set value. In this case, the operation value still exceeds the set value even though the flow path to the spray arm 13, 14, or 15 is changed, and thus the controller 1000 may be configured to determine that the spray arm 13, 14, or 15 is not clogged with the foreign substances but the condenser 300 is clogged with the foreign substances. Accordingly, the controller 1000 may be configured to issue an alarm or notification notifying that the condenser 300 is clogged with the foreign substances.

[0147] In one embodiment, the operation value may be an electrical current value applied to the washing pump 150. For example, the controller 1000 may be configured to adjust the number of revolutions of the motor provided in the washing pump 150 by changing the electrical current value applied to the washing pump 150. Accordingly, the magnitude of the pressure applied to the washing water under the operation of the washing pump 150 may be adjusted.

[0148] Accordingly, the controller 1000 may be configured to know the electrical current value applied to the washing pump 150. In response to that the electrical current value applied to the washing pump 150 exceeds a set value, the controller 1000 may be configured to determine that the spray arm 13, 14, or 15 or the condenser 300 are clogged with the foreign substances.

[0149] When the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances, the washing pump 150 may consume a larger amount of the electrical current such that the washing water smoothly flows. Accordingly, as the amount by which the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substance increases, the electrical current value applied to the washing pump 150 may increase.

[0150] When the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances to the extent that the operation of the dishwasher is disrupted, the electrical current value applied to the washing pump 150 may exceed the set value.

[0151] In this case, the controller 1000 may be configured to determine that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances. In this regard, the electrical current value which is equal to the set value may be set to a value at which it is determined that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances to the extent that the operation of the dishwasher is disrupted due to continuous use of the dishwasher, thereby requiring a separate action to cope therewith. In this regard, the electrical current value which is equal to the set value is greater than the electrical current value applied to the washing pump 150 operating in a normal state.

[0152] The electrical current value equal to the set value may be derived through machine learning of artificial intelligence during continuous use of the dishwasher.

[0153] In another embodiment, the operation value may be a temperature value measured at the refrigerant outlet of the compressor 500. The temperature value may be measured by the thermistor 501 disposed at the refrigerant outlet of the compressor 500, and the controller 1000 may be configured to know the temperature value.

[0154] When the condenser 300 is clogged with the foreign substance, a flow rate of washing water in the condenser 300 may be reduced. Accordingly, the heat exchange is not smooth in the condenser 300, such that the refrigerant at a temperature higher than that of a normal case may be discharged from the condenser 300. Accordingly, the refrigerant circulating through the components of the heat pump system may be introduced into the compressor 500 while being at a higher temperature than that of a normal case, and may be discharged from the compressor 500 while being at a higher temperature than that of a normal case. Accordingly, as the amount by which the condenser 300 is clogged with the foreign substance increases, the temperature value of the refrigerant outlet of the compressor 500 may increase.

[0155] Similarly, when the spray arm 13, 14, or 15 is clogged with the foreign substance, the flow rate of the circulating washing water decreases, such that the flow rate of the washing water in the condenser 300 decreases. Thus, as the amount by which the spray arm 13, 14, or 15 is clogged with the foreign substance increases, the temperature value of the refrigerant outlet of the compressor 500 may increase.

[0156] When the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances to the extent that the operation of the dishwasher is disrupted, the temperature value at the refrigerant outlet of the compressor 500 may exceed the set value.

[0157] In this case, the controller 1000 may be configured to determine that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances. As described above, the temperature value which is equal to the set value may be set to a value at which it is determined that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances to the extent that the operation of the dishwasher is disrupted due to continuous use of the dishwasher, thereby requiring a separate action to cope therewith. In this case, the temperature value which is equal to the set value is greater than the temperature value of the refrigerant outlet of the compressor 500 operating in a normal state.

[0158] The temperature value equal to the set value may be derived through machine learning of artificial intelligence during continuous use of the dishwasher.

[0159] In one example, in step S150 or step S160, the alarm or notification may be displayed, for example, in a text, a symbol, or the like, on a display device of the dishwasher, or may be known to the user through a speaker provided in the dishwasher.

[0160] In one example, the dishwasher may be remotely connected to the mobile device carried by the user. Accordingly, the dishwasher may transmit an alarm or notification to the mobile device so that the user in a remote location from the dishwasher may receive the alarm or notification through the mobile device.

[0161] The user may know that a problem has occurred in the spray arm 13, 14, or 15 or the condenser 300 through the alarm or notification. Through the above-described process, controller may know whether the condenser 300 is clogged with the foreign substances, whether the spray arm 13, 14, or 15 is clogged with the foreign substances. In response to that the spray arm 13, 14, or 15 is clogged with the foreign substances, the controller may determine which one of the top spray arm 15, the upper spray arm 14, and the lower spray arm 13 is clogged with the foreign substances. Thus, the dishwasher may notify the user of specific information on which one of the spray arm 13, 14, or 15 is clogged with the foreign substances. The user may take measures such as repair.

[0162] However, even when the user does not take special measures such as repair, the dishwasher may remove the foreign substances accumulated in the spray arm 13, 14, or 15 or the condenser 300 by itself.

[0163] The controller 1000 may be configured to remove the foreign substances accumulated in the spray arm 13, 14, or 15 or the condenser 300 in S170.

[0164] In the step of removing the foreign substances accumulated in the spray arm or the condenser 300, the RPM (number of revolutions per minute) value of the motor provided in the washing pump 150 may be increased.

[0165] When the RPM value of the motor increases, the washing pump 150 may pump the washing water by applying a higher pressure thereto. Accordingly, the high-pressure washing water may push the foreign substances accumulated in the spray arm 13, 14, or 15 or the washing water tube of the condenser 300, thereby effectively removing the foreign substances from the spray arm 13, 14, or 15 or the condenser 300.

[0166] In an embodiment, without adding a separate device to the dishwasher, the dishwasher may effectively detect that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances under the operation of each of the existing compressor 500, the existing washing pump 150, and the controller 1000 for controlling the compressor and the washing pump provided in the dishwasher and notify the user of this situation. Accordingly, convenience may be provided to the user.

[0167] In the method for controlling the dishwasher according to an embodiment, the operation value may be at least one of the electrical current value applied to the washing pump 150 or the temperature value of the refrigerant outlet of the compressor 500.

[0168] The process of detecting the clogging of the condenser 300 or removing the foreign substances therefrom may be performed while the dishwasher operates to perform the washing process of the dishes or the rinsing process of the dishes.

[0169] Hereinafter, for example, a case in which both the electrical current value applied to the washing pump 150 and the temperature value of the refrigerant outlet of the compressor 500 are used as the operation value will be described in detail. A case in which only one of the electrical current value and the temperature value is used as an operation value is also apparent from the following descriptions.

[0170] FIG. 6 is a flowchart illustrating a method for controlling a dishwasher according to another embodiment. The set value may be at least one of a first set value set with respect to the electrical current value applied to the washing pump 150 or a second set value set with respect to the temperature value of the refrigerant outlet of the compressor 500.

[0171] The controller 1000 may be configured to measure the electrical current value of the washing pump 150, and the temperature value of the refrigerant outlet of the compressor 500 using the thermistor 501.

[0172] For example, when the operation value is the electrical current value, the controller 1000 may be configured to determine the clogging of the spray arm 13, 14, or 15 or the condenser 300 based on the electrical current value applied to the washing pump 150.

[0173] In response to that the electrical current value exceeds a first set value, the controller 1000 may be configured to determine that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substance and issue an alarm or notification. In addition, the controller 1000 may be configured to remove the foreign substances from the spray arm 13, 14, or 15 or the condenser 300 by itself.

[0174] The temperature value may not change rapidly for a short time. However, during the operation of the washing pump 150, the electrical current value applied to the washing pump 150 may be rapidly changed due to an external influence, for example, interference of electromagnetic waves for a short time.

[0175] Accordingly, the value of the electrical current applied to the washing pump 150 may rapidly change for a short time.

[0176] Accordingly, in order to reduce the detection error, when the operation value is the electrical current value, it may be determined that the spray arm or the condenser 300 is clogged with the foreign substances in response to that a state in which the electrical current value exceeds the first set value is maintained for a set first time duration.

[0177] The first time duration may be set to an appropriate time duration sized to reduce the detection error, for example, about 5 seconds to about 10 seconds. However, the present disclosure is not limited thereto.

[0178] In response to that there is no problem with the electrical current value acting as the operation value, the operation value is changed to the temperature value. In this case, the controller 1000 may be configured to determine the clogging of the condenser 300 based on the temperature value of the refrigerant outlet of the compressor 500.

[0179] When the temperature measured by the thermistor 501, that is, the temperature value of the refrigerant outlet of the compressor 500 exceeds a second set value, the controller 1000 may be configured to operate the switching valve 130 to change the spray arm 13, 14, or 15 to which the washing water is to be supplied. For example, when the washing water is currently flowing to the top spray arm 15 to spray the washing water, the flow path of the washing water may be changed from the flow path to the top spray arm to the flow path to the upper spray arm 14.

[0180] That is, when two conditions, that is, the first condition that the state in which the electrical current value exceeds the first set value is maintained for the first time duration and the second condition that the temperature value exceeds the second set value are satisfied, it may be determined that one of the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances. Thereafter, the process of determining which one of the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances may proceed.

[0181] In this regard, which one of whether the first condition related to the electrical current value applied to the washing pump 150 is satisfied and whether the second condition related to the temperature value of the refrigerant outlet of the compressor 500 is satisfied is first determined is not fixed. Accordingly, the controller 1000 may be configured to determine first whether the first condition related to the electrical current value applied to the washing pump 150 is satisfied and then to determine whether the second condition related to the temperature value of the refrigerant outlet of the compressor 500 is satisfied. Alternatively, the controller 1000 may be configured to determine first whether the second condition related to the temperature value of the refrigerant outlet of the compressor 500 is satisfied and then determine whether the first condition related to the electrical current value applied to the washing pump 150 is satisfied. Alternatively, the controller 1000 may be configured to determine whether the first condition related to the electrical current value applied to the washing pump 150 is satisfied and determine whether the second condition related to the temperature value of the refrigerant outlet of the compressor 500 is satisfied at the same time.

[0182] Next, the controller 1000 may be configured to determine whether the state in which the electrical current value exceeds the first set value is maintained for the first time duration and whether the temperature value exceeds the second set value. In response to that any one of the two conditions is not satisfied, it may be determined that the spray arm 13, 14, or 15 is clogged with the foreign substances. In this regard, for example, when the flow path has been changed from the flow path to the top spray arm 15 to the flow path to the upper spray arm 14, it may be determined that the top spray arm 15 is clogged with the foreign substances.

[0183] In this case, the controller 1000 may be configured to generate a notification that the spray arm 13, 14, or 15 is clogged with the foreign substances and remove the foreign substances from the spray arms 13, 14, and 15. When the removal of foreign substances from the spray arm 13, 14, and 15 has been completed, the washing process returns to a normal process again, and the measurement of the electrical current value of the washing pump 150 and the temperature value measurement of the thermistor 501 may be continuously performed to monitor whether the clogging occurs.

[0184] In response to that the state in which the electrical current value exceeds the first set value is maintained for the first time duration and the temperature value exceeds the second set value, such that both of these two conditions are satisfied, it may be determined that the condenser 300 is clogged with the foreign substances.

[0185] In this case, the controller 1000 may be configured to generate a notification that the condenser 300 is clogged with the foreign substances and remove the foreign substances from the condenser 300. When the removal of the foreign substances from the condenser 300 has been completed, the washing process returns to the normal process again, and measurement of the electrical current value of the washing pump 150 and the temperature value measurement of the thermistor 501 may be continuously performed to monitor whether clogging occurs.

[0186] In an embodiment, whether the clogging occurs may be determined with high reliability by utilizing both the load electrical current value of the washing pump 150 and the temperature value of the refrigerant outlet of the compressor. When only the load electrical current value of the washing pump 150 is used, it is not known exactly which causes the detector error, such as aging of the washing pump 150. When only the refrigerant outlet temperature value of the compressor is used, various errors such as an increase in external temperature cannot be discriminated. However, when both of these values are used, the cause of the detection error can be more accurately identified. In addition, when the measurement of the values is performed under the control of the switching valve 130, which one of the top, upper and lower spray arms 13, 14, and 15 at which the clogging occurs may be specified.

[0187] FIG. 7 is a flowchart illustrating a process of issuing an alarm or notification and removing foreign substances in a method for controlling a dishwasher. FIG. 7 is a flowchart showing in detail the generation of the notification that the spray arm or the condenser is clogged with the foreign substances and the process of removing foreign substances therefrom as shown in FIG. 6.

[0188] As described above, the controller 100 may generate the notification that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances.

[0189] After issuing the alarm or notification, the controller 1000 may be configured to operate the switching valve 130 to return the flow path of the washing water to the flow path the previous spray arm 13, 14, or 15. For example, when the flow path has been changed from the flow path to the top spray arm 15 to the flow path to the upper spray arm 14 to determine whether the top spray arm 15 is clogged while the washing water flows toward the top spray arm 15, the controller 1000 may be configured to control the switching valve 130 to change the flow path of the washing water from the flow path to the upper spray arm 14 back to the flow path to the top spray arm 15. Returning the flow path to the previous spray arm may allow the foreign substances to be removed from the clogged spray arm 13, 14, or 15 or to allow the dish washing process to be performed.

[0190] Next, the controller 1000 may be configured to remove the foreign substances by itself. The removal of the foreign substances from the spray arm 13, 14, or 15 and the removal of the foreign substances from the condenser 300 may be performed in the same process and manner.

[0191] In the removing of the foreign substances accumulated in the spray arm 13, 14, or 15 or the condenser 300, the motor may be operated for a second time duration at the RPM value of the motor set as a third set value. The controller 1000 may be configured to rotate the motor at high speed to remove the foreign substances from the spray arm 13, 14, or 15 or the condenser 300.

[0192] The operation of the motor of the washing pump 150 for removing the foreign substances from the condenser 300 may be performed for the set second time duration. The second time duration may be appropriately selected as a time duration for which the foreign substances accumulated in the condenser 300 may be sufficiently removed by the high-pressure washing water.

[0193] The third set value may be a value greater than the RPM of the motor of the washing pump 150 operating in a normal state, and may be appropriately selected in a range in which the damage to the washing pump 150 does not occur.

[0194] Through the above-described process, the dishwasher may apply the high-pressure washing water to the spray arm 13, 14, or 15 or the tube through which the washing water flows inside the condenser 300 by using the washing pump 150. Accordingly, the foreign substances accumulated in the spray arm 13, 14, or 15 or the condenser 300 may be effectively removed by the pressure of the washing water. Accordingly, the dishwasher may automatically remove the foreign substances from the spray arms 13, 14, and 15 or the tube in the condenser 300 using the washing pump 150 provided in the dishwasher without using a separate device. Accordingly, convenience may be provided to the user.

[0195] Further, it is necessary to check whether the foreign substances has been sufficiently removed from the condenser 300. In response to that the foreign substance is not sufficiently removed, the foreign substance removal step may be repeated a plurality of times.

[0196] In response to that the electrical current value applied to the washing pump 150 exceeds the first set value after the operation of the motor for removing the foreign substances is terminated, the controller 1000 may be configured to operate the motor again for the second time duration at the RPM value of the motor set as the third set value.

[0197] In this regard, in response to that the state in which the electrical current value exceeds the first set value is maintained for the first time duration, the motor may be operated again.

[0198] The foreign substances removal operation may be terminated, and the RPM value of the motor may be returned to the value prior to the removal operation. That is, when the foreign substance removal operation has been completed, the motor is not stopped, but is rotated to the RPM set in the normal state, that is, a state in which the spray arm 13, 14, or 15 or the condenser 300 is not clogged with the foreign substances, so that the dishwasher may continue the washing process or the rinsing process.

[0199] In this regard, in order to check whether the problem in which the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances has been solved by sufficiently removing the foreign substances from the spray arm 13, 14, or 15 or the condenser 300, the controller 1000 may be configured to check the electrical current value applied to the washing pump 150.

[0200] In response to that the state in which the electrical current value applied to the washing pump 150 exceeds the first set value is maintained for the first time duration, the controller 1000 may be configured to determine that the condenser 300 is still clogged with the foreign substances.

[0201] Accordingly, the controller 1000 may be configured to operate the motor for the second time duration again at the RPM value of the motor set as the third set value.

[0202] The process of removing the foreign substances from the condenser 300 and the process of checking whether the foreign substances have been sufficiently removed therefrom may be repeated a plurality of times. When the foreign substances is sufficiently removed from the condenser 300 through the plurality of processes, the foreign substances removal process may be terminated. When the foreign substance removal process has been completed, the dishwasher may continue the dishwasher washing process or rinsing process.

[0203] In another embodiment, when it is checked whether the foreign substances is sufficiently removed from the condenser 300, whether the foreign substances are sufficiently removed from the condenser 300 may be determined based on whether the temperature value of the refrigerant outlet of the compressor 500 exceeds the second set value. Details thereof are as described above.

[0204] In an embodiment, upon detection that the spray arm 13, 14, or 15 or the condenser 300 is clogged with the foreign substances, the dishwasher may sufficiently effectively remove the foreign substances from the spray arm 13, 14, or 15 or the condenser 300 by repeating the process of removing the foreign substances from the spray arm 13, 14, or 15 or the condenser 300 and checking whether the foreign substances are sufficiently removed therefrom a plurality of times. Accordingly, convenience may be provided to the user.

[0205] On the other hand, in response to that the foreign substances are not sufficiently removed even though the process of removing the foreign substances accumulated in the spray arms 13, 14, and 15 or the condenser 300 and the process of checking whether the foreign substances are sufficiently removed therefrom are performed a set number of times, the controller 1000 may be configured to issue an alarm or notification of the removal failure to the user.

[0206] The removal of the foreign substances and the verifying whether the foreign substances have been sufficiently removed cannot be repeated infinitely. The foreign substances may not be sufficiently removed even after the foreign substances removing step is sufficiently repeated. This is because the foreign substances accumulated in the condenser 300 cannot be removed therefrom using the process in which the dishwasher itself removes the foreign substances.

[0207] Accordingly, in response to that the foreign substance is not sufficiently removed even after the foreign substance removal step is repeated a set number of times, the controller 1000 may be configured to issue a separate alarm or notification of the removal failure to the user.

[0208] Upon receiving the alarm or notification of the removal failure, the user may recognize that the foreign substances have not been sufficiently removed in the automatic foreign substances removal process from the condenser 300 using the dishwasher itself. Accordingly, the user may directly repair or replace the condenser 300.

[0209] The present disclosure has been described above with reference to the drawings illustrated in the present disclosure. However, the present disclosure is not limited by the embodiments and drawings disclosed in the present disclosure, and it is obvious that various modifications may be made thereto by a person skilled in the art within the scope of the technical idea of the present disclosure. In addition, even when the effects according to the configuration of the present disclosure are not explicitly described and set forth while describing the embodiments of the present disclosure, it is obvious that the predictable effects therefrom should also be recognized.

Claims

1. A method for controlling a dishwasher, the dishwasher comprising:a tub constructed to accommodate therein dishes;a spray arm disposed in the tub and configured to spray washing water to the dishes, wherein the spray arm includes a plurality of spray arms positioned at different positions;a compressor for compressing refrigerant;a condenser fluid-communicating with the compressor, wherein heat exchange between the washing water and the refrigerant occurs while washing water and the refrigerant flow separately in the condenser; anda washing pump fluid-communicating with the condenser and configured to transfer the washing water,wherein the method comprises:measuring an operation value generated under an operation of at least one of the compressor or the washing pump;comparing the operation value with a set value; andin response to that the operation value exceeds the set value, determining that at least one of the compressor or the spray arm is clogged with foreign substances.

2. The method of claim 1, wherein the dishwasher comprises a switching valve configured to operate such that the washing water is selectively supplied to at least one of the plurality of spray arms,wherein the method further comprises:operating the switching valve to change the spray arm to which the washing water is to be supplied among the plurality of spray arms to which the washing water may be supplied;measuring the operation value generated under the operation of at least one of the compressor or the washing pump after the change; andcomparing the operation value measured after the change with the set value.

3. The method of claim 1, wherein the operation value is an electrical current value applied to the washing pump.

4. The method of claim 1, wherein the operation value is a temperature value of a refrigerant outlet of the compressor.

5. The method of claim 1, wherein the operation value is at least one of an electrical current value applied to the washing pump or a temperature value of a refrigerant outlet of the compressor.

6. The method of claim 5, wherein the set value is at least one of a first set value set about the electrical current value applied to the washing pump or a second set value set about the temperature value of the refrigerant outlet of the compressor.

7. The method of claim 2, wherein the method further comprises:in response to that the operation value is lower than or equal to the set value, issuing an alarm or notification notifying that the spray arm is clogged with the foreign substances; andin response to that the operation value exceeds the set value, issuing an alarm or notification notifying that the condenser is clogged with the foreign substances.

8. The method of claim 7, wherein the operation value is an electrical current value applied to the washing pump,wherein in response to that a state in which the electrical current value exceeds the first set value is maintained for a set first time duration, the alarm or notification is issued.

9. The method of claim 2, wherein the method further comprises removing the foreign substances accumulated in the spray arm or the condenser.

10. The method of claim 9, wherein in the removing of the foreign substances accumulated in the spray arm or the condenser, a RPM value of a motor provided in the washing pump is increased.

11. The method of claim 10, wherein in the removing of the foreign substances accumulated in the spray arm or the condenser, the motor operates for a set second time duration at a RPM value of the motor set as a third set value.

12. The method of claim 11, wherein the method further comprises:in response to that the electrical current value applied to the washing pump exceeds the first set value after the foreign substance removal operation has been completed,operating the motor for the second time duration at the RPM value of the motor set as the third set value.

13. The method of claim 12, wherein the method further comprises:in response to that a state in which the electrical current value exceeds the first set value is maintained for a set first time duration, operating the motor again 14. The method of claim 7, wherein the method further comprises:after the alarm or notification is issued, operating the switching valve such that a flow path of the washing water is returned to a flow path to the spray arm before the change.

15. A method for controlling a dishwasher, the dishwasher comprising:a tub constructed to accommodate therein dishes;a spray arm disposed in the tub and configured to spray washing water to the dishes, wherein the spray arm includes a plurality of spray arms positioned at different positions;a switching valve configured to operate such that the washing water is selectively supplied to at least one of the plurality of spray arms,a compressor for compressing refrigerant;a condenser fluid-communicating with the compressor, wherein heat exchange between the washing water and the refrigerant occurs while washing water and the refrigerant flow separately in the condenser; anda washing pump fluid-communicating with the condenser and configured to transfer the washing water,wherein the method comprises:measuring an operation value generated under an operation the washing pump;comparing the operation value with a set value; andin response to that the operation value exceeds the set value, operating the switching valve to change the spray arm to which the washing water is to be supplied among the plurality of spray arms to which the washing water may be supplied;measuring the operation value generated under the operation of the washing pump after the change;comparing the operation value measured after the change with the set value;in response to that the operation value is equal to or lower than the set value, removing foreign substances accumulated in the spray arm; andin response to that the operation value exceeds the set value, removing foreign substances accumulated in the condenser.

16. The method of claim 15, wherein the operation value is at least one of an electrical current value applied to the washing pump or a temperature value of a refrigerant outlet of the compressor.

17. The method of claim 16, wherein the set value is at least one of a first set value set about the electrical current value applied to the washing pump or a second set value set about the temperature value of the refrigerant outlet of the compressor.

18. The method of claim 17, wherein in the removing of the foreign substances accumulated in the spray arm or the condenser, a RPM value of a motor provided in the washing pump is increased.

19. The method of claim 18, wherein in the removing of the foreign substances accumulated in the spray arm or the condenser, the motor operates for a set second time duration at a RPM value of the motor set as a third set value.

20. The method of claim 15, wherein the method further comprises checking whether the foreign substances have been removed from the spray arm or the condenser,wherein the method further comprises:in response to that the foreign substances are not removed even though the removing of the foreign substances accumulated in the spray arm or the condenser and the checking of whether the foreign substances have been removed from the spray arm or the condenser are performed a predetermined number of times,issuing an alarm or notification of the removal failure to a user.

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