Method for controlling a dishwasher

Abstract

The present disclosure provides a method for controlling a dishwasher. The dishwasher includes a tub configured to accommodate tableware therein, a spray arm arranged in the tub and configured to spray the tableware with washing water, wherein the spray arm includes a plurality of spray arms positioned at different positions, a compressor for compressing a refrigerant, a condenser in fluid communication with the compressor, wherein heat exchange occurs between the washing water and the refrigerant while the washing water and the refrigerant flow separately in the condenser, and a washing pump in fluid communication with the condenser and configured to deliver the washing water. The method for controlling the dishwasher includes measuring an operation value generated under operation of at least one of the compressor and the washing pump, comparing the operation value with a set value, and determining that at least one of the compressor and the spray arm is clogged with a foreign object in response to the operation value exceeding the set value.

Description

Technical Field

[0001] This disclosure relates to a method for controlling a dishwasher, and more specifically, to a method for controlling a dishwasher equipped with a heat pump system for heating wash water. Background Technology

[0002] The content described in this section provides only background information about this disclosure and does not constitute prior art.

[0003] A dishwasher is a device that uses detergent and washing water to wash food residue (such as food crumbs) off dishes or cookware.

[0004] A typical dishwasher includes: a tub that provides washing space; shelves that are arranged in the tub and hold dishes; spray arms that spray washing water onto the shelves; a water reservoir that stores the washing water; and a pump that supplies the washing water stored in the water reservoir to the spray arms.

[0005] The temperature of the wash water used in a dishwasher can be room temperature. However, using hot wash water can improve washing efficiency and shorten washing time. Therefore, hot wash water can be used for washing or rinsing dishes for at least a portion of the dishwasher's operation.

[0006] A heating device for heating washing water can be configured as, for example, an electric heater, a heat pump system, etc.

[0007] Because heat pump systems are more energy efficient than electric heaters, in recent years, there has been an increasing trend of incorporating heat pump systems into dishwashers for heating washing water.

[0008] A heat pump system can be equipped with a condenser, which heats the wash water through heat exchange between a high-temperature refrigerant and the relatively low-temperature wash water. The wash water can be heated to a high temperature as it flows through the condenser.

[0009] The refrigerant and wash water can flow separately within the condenser. Therefore, heat is transferred from the high-temperature refrigerant to the wash water, thus condensing the refrigerant while simultaneously heating the wash water. To increase the contact area between the wash water and the refrigerant (i.e., the heat exchange area between them), the flow path of the wash water can consist of multiple pipes.

[0010] Because these multiple pipes are arranged within the condenser, wash water can flow to the pipe with the larger diameter and then to the pipe with the smaller diameter. When the pipe diameter is relatively small, blockages may occur within it.

[0011] With the operation of the washing pump, the washing water flowing through the pipes can be circulated through the dishwasher. Therefore, when washing dishes, foreign objects adhering to the surface of the dishes and removed from them by the washing water may be included in the circulating washing water.

[0012] When wash water containing foreign matter is introduced into a smaller diameter pipe, the foreign matter may adhere to the inner surface of the pipe instead of being expelled. As this circulation of wash water continues, the amount of foreign matter adhering to the inner surface of the pipe may increase.

[0013] Therefore, with continuous dishwasher use, foreign objects can accumulate inside the pipes, potentially causing poor flow of wash water in the condenser. If this continues, at least some pipes may become clogged, and the flow of wash water may deteriorate more quickly.

[0014] This can lead to condenser damage, malfunction of the dishwasher, and in severe cases, may cause the dishwasher to stop operating altogether.

[0015] Therefore, there is a need to develop a control method for detecting the accumulation of foreign matter in the condenser. Furthermore, it is necessary to develop a method for removing foreign matter from the condenser in response to the detection of its accumulation.

[0016] Similarly, foreign objects may accumulate in the spray arm that sprays washing water onto the tableware. Therefore, it is necessary to develop a method for detecting the accumulation of foreign objects in the spray arm and removing them from the spray arm. Summary of the Invention

[0017] The technical objective of this disclosure is to provide a method for controlling a dishwasher having a structure for detecting the accumulation of foreign matter in the spray arms or condenser.

[0018] Furthermore, the technical objective of this disclosure is to provide a method for controlling a dishwasher having a structure for removing foreign matter from the spray arm or the condenser in response to the detection of foreign matter accumulation in the spray arm or the condenser.

[0019] Furthermore, the technical objective of this disclosure is to provide a method for controlling a dishwasher having a structure for detecting and removing the accumulation of foreign matter in the spray arms or condenser without adding a separate device to the dishwasher.

[0020] The purpose of this disclosure is not limited to the purposes mentioned above. Other unmentioned purposes and advantages of this disclosure may be understood based on the following description and may be more clearly understood based on embodiments according to this disclosure. Furthermore, it will be readily understood that the purposes and advantages of this disclosure can be achieved using the means or combinations thereof as shown in the claims.

[0021] The dishwasher according to an embodiment may include a bucket in which tableware is contained.

[0022] The dishwasher may include multiple spray arms arranged in the tub to spray washing water and positioned at different locations.

[0023] The dishwasher may include a compressor for compressing the refrigerant.

[0024] The dishwasher may include a condenser in fluid communication with the compressor. In the condenser, wash water and the refrigerant flow separately while heat exchange occurs between the wash water and the refrigerant.

[0025] The dishwasher may include a wash pump in fluid communication with the condenser. The wash pump can deliver wash water.

[0026] In a dishwasher control method according to an embodiment, the controller can measure operating values ​​generated under the operation of at least one of the compressor and the washing pump.

[0027] Next, the controller can compare the operating value with the set value.

[0028] In response to the operating value exceeding the set value, the controller can determine that at least one of the compressor and the spray arm is blocked by the foreign object.

[0029] The dishwasher may include a switching valve configured to operate such that the washing water is selectively supplied to at least one of the plurality of spray arms.

[0030] Next, in response to the operating value exceeding the set value, the controller can operate the switching valve to change the spray arm to which the washing water is to be supplied among the plurality of spray arms.

[0031] Next, the controller can measure the operating value generated under the operation of at least one of the compressor and the washing pump after the change, and compare the measured operating value after the change with the set value.

[0032] Next, in response to the operating value being lower than or equal to the set value, the controller may issue an alarm or notification informing that the spray arm is blocked by the foreign object.

[0033] Next, in response to the operating value exceeding the set value, the controller may issue an alarm or notification informing the condenser that it is blocked by the foreign object.

[0034] The operating value can be the current value applied to the washing pump.

[0035] In another embodiment, the operating value may be the temperature value at the refrigerant outlet of the compressor.

[0036] The controller can remove foreign matter that has accumulated in the spray arm or the condenser.

[0037] In the step of removing foreign matter accumulated in the spray arm or condenser, the rotational speed (RPM) of the motor installed in the washing pump can be increased.

[0038] In the method for controlling the dishwasher according to an embodiment, the operating value may be at least one of the current value applied to the washing pump and the temperature value of the refrigerant outlet of the compressor.

[0039] The setting value may be at least one of a first setting value set for the current value applied to the washing pump and a second setting value set for the temperature value of the refrigerant outlet of the compressor.

[0040] When the operating value is the current value applied to the washing pump, an alarm or notification may be issued in response to the state in which the current value exceeds the first set value and is maintained for a set first duration.

[0041] In the step of removing foreign matter accumulated in the spray arm or the condenser, the motor may operate at a motor RPM value set to a third set value for a set second duration.

[0042] After the foreign object removal operation is completed, in response to the current value applied to the washing pump exceeding the first set value, the controller can again operate the motor at the motor speed (RPM) value set to the third set value for the second duration.

[0043] After the motor has completed its operation to remove the foreign object, in response to the current value applied to the washing pump exceeding the first set value, the controller may again operate the motor at a motor speed (RPM) value set to the third set value for the second duration.

[0044] In this regard, the motor can be operated again in response to the state in which the current value exceeds the first set value being maintained for the first duration.

[0045] Furthermore, after the alarm or notification is issued, the controller can operate the switching valve to restore the flow path of the washing water to the flow path leading to the spray arm before the change.

[0046] The method for controlling the dishwasher according to an embodiment may further include checking whether foreign matter has been removed from the spray arm or the condenser. The method may further include issuing an alarm or notification to the user if the foreign matter has not been removed even after a predetermined number of operations have been performed to remove the foreign matter accumulated in the spray arm or the condenser and to check whether the foreign matter has been removed from the spray arm or the condenser.

[0047] The effects of this disclosure are as follows.

[0048] The method for controlling the dishwasher according to this disclosure can effectively detect whether the spray arm or the condenser is blocked by foreign objects by operating the existing compressor, existing wash pump, and the controller set in the dishwasher to control them, without the need to add a separate device to the dishwasher, and notify the user of the detection result. Therefore, it can provide convenience to the user.

[0049] Furthermore, in the dishwasher control method according to this disclosure, the wash pump can be used to apply high-pressure wash water to the spray arm or the pipe through which the wash water flows inside the condenser. Therefore, the pressure of the wash water can effectively remove foreign matter accumulated in the spray arm or the condenser. Thus, the dishwasher can automatically remove foreign matter from the spray arm or the pipe in the condenser using the wash pump installed in the dishwasher without the need for a separate device, thereby providing convenience for the user.

[0050] Furthermore, in the method for controlling the dishwasher according to this disclosure, when the dishwasher detects blockage in the condenser, it can effectively remove the foreign matter from the condenser by repeatedly performing the process of removing the foreign matter from the spray arm or the condenser and checking whether the foreign matter has been sufficiently removed from the spray arm or the condenser. Therefore, this provides convenience for the user.

[0051] In addition to the effects described above, the specific effects of this disclosure will also be described in explaining the specific matters used to implement this disclosure. Attached Figure Description

[0052] Figure 1 This is a cross-sectional view of a dishwasher according to an embodiment.

[0053] Figure 2 This is a schematic diagram illustrating components arranged in the base of a dishwasher according to an embodiment.

[0054] Figure 3This is a schematic diagram illustrating a method for controlling a dishwasher according to an embodiment.

[0055] Figure 4 This is a flowchart illustrating a method for controlling a dishwasher according to an embodiment.

[0056] Figure 5 This is a block diagram illustrating a portion of a dishwasher according to an embodiment.

[0057] Figure 6 This is a flowchart illustrating a method for controlling a dishwasher according to another embodiment.

[0058] Figure 7 This is a flowchart illustrating the process of issuing an alarm or notification and removing foreign objects in a method for controlling a dishwasher. Detailed Implementation

[0059] The aforementioned objects, features, and advantages will be described in detail below with reference to the accompanying drawings, so that those skilled in the art to which this disclosure pertains can easily practice the technical ideas of this disclosure. In describing this disclosure, detailed descriptions of well-known technologies related to this disclosure will be omitted where it is determined that such detailed descriptions might unnecessarily obscure the main points of this disclosure. Hereinafter, preferred embodiments of this disclosure will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to denote the same or similar components.

[0060] Although terms such as "first" and "second" are used to describe various components, these components are not limited by these terms. These terms are only used to distinguish one component from another, and unless there is an explicit statement to the contrary, "first component" can also be "second component".

[0061] Throughout this document, unless otherwise stated, each part may be singular or plural.

[0062] As used herein, unless the context clearly indicates otherwise, singular expressions include plural expressions. In this application, terms such as “consisting of” or “comprising” should not be construed as necessarily including all of the components or steps described herein, but should be interpreted as possibly excluding some of the components or steps, and may also include additional components or steps.

[0063] Throughout this disclosure, unless otherwise stated, “A and / or B” means A, B or A and B, and unless otherwise stated, “C to D” means including C to D.

[0064] As used in this article, terms such as “upper,” “lower,” and “side” are used to refer to a portion of the dishwasher in its normally installed state, or in one direction.

[0065] Figure 1 This is a cross-sectional view of a dishwasher according to an embodiment. The dishwasher according to the embodiment may include: a housing 11 that defines the appearance of the dishwasher; a tub 12 in which dishes to be washed are housed; a door 20 disposed on the front surface of the tub 12 to open and close the tub 12; and a water collector 100 disposed below the tub 12 to store washing water therein.

[0066] The dishwasher may also include: a plurality of spray arms 13, 14 and 15 arranged in a tub 12 and spraying wash water; a filter 110 disposed in a water collector 100 and filtering the wash water sprayed from at least one of the plurality of spray arms 13, 14 and 15 and collected back to the water collector 100; a wash pump 150 that delivers wash water stored in the water collector 100; and a switching valve 130 that controls the selective flow of wash water delivered by the wash pump 150 to at least one of the plurality of spray arms 13, 14 and 15.

[0067] The tub 12 can be formed in the shape of a hexahedron with an open front surface, and can have a washing chamber 12a defined therein. A connecting hole is formed in the bottom portion 12b of the tub 12, through which washing water flows into the water collector 100. In the washing chamber 12a, a plurality of shelves 16 and 17 are arranged therein, which accommodate washing objects. The plurality of shelves 16 and 17 may include a lower shelf 16 arranged in the lower region of the washing chamber 12a and an upper shelf 17 arranged in the upper region of the washing chamber 12a. The lower shelf 16 and the upper shelf 17 are arranged to be spaced apart from each other in the vertical direction and can slide in the forward direction of the tub 12 and extend from the tub 12.

[0068] Multiple spray arms 13, 14, and 15 are arranged vertically. The multiple spray arms may include: a lower spray arm 13, which is arranged at the lowest end and sprays washing water upward toward the lower shelf 16; an upper spray arm 14, which is arranged on top of the lower spray arm 13 and sprays washing water upward toward the upper shelf 17; and a top spray arm 15, which is arranged at the upper end of the washing chamber 12a and on top of the upper spray arm 14, and sprays washing water downward.

[0069] Multiple spray arms 13, 14, and 15 are supplied with washing water from the washing pump 150 via multiple spray arm connection flow paths 18, 19, and 21. The multiple spray arm connection flow paths 18, 19, and 21 may include: a lower spray arm connection flow path 18, which connects to the lower spray arm 13; an upper spray arm connection flow path 19, which connects to the upper spray arm 14; and a top spray arm connection flow path 21, which connects to the top spray arm 15.

[0070] The lower spray arm 13, the upper spray arm 14, and the top spray arm 15 can be supplied with washing water from the washing pump 150 through the lower spray arm connecting flow path 18, the upper spray arm connecting flow path 19, and the top spray arm connecting flow path 21, respectively.

[0071] The water collector 100 can be arranged below the bottom portion 12b of the tub 12 and can collect washing water. The filter 110 can filter out contaminants from the washing water flowing from the tub 12 to the water collector 100.

[0072] Washing water sprayed by multiple spray arms 13, 14 and 15, along with contaminants deposited on and removed from the target object, falls into the bottom portion 12b of the tank 12. Thus, the contaminant-containing washing water can be filtered as it flows through a filter 110 connected to the bottom portion 12b of the tank 12, allowing contaminant-free washing water to be stored in the collector 100.

[0073] During the washing operation, the washing water circulates through the water collector 100, spray arms 13 to 15, tub 12 and filter 110, while washing the tableware contained in shelves 16 and 17.

[0074] Washing pump 150 supplies washing water stored in collector 100 to at least one of a plurality of spray arms 13, 14 and 15. Washing pump 150 may include a washing motor that generates rotational force and an impeller that is rotated by the washing motor to deliver washing water. Washing pump 150 may be connected to switching valve 130 and washing water supply flow path 180.

[0075] When the washing pump 150 is operating, the washing water stored in the water collector 100 can be introduced into the washing pump 150 through the water collection flow path 170, and then delivered to the switching valve 130 through the washing water supply flow path 180.

[0076] The switching valve 130 selectively supplies washing water, delivered by 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 can selectively connect the washing water supply flow path 180 to at least one of the multiple spray arm connection flow paths 18, 19, and 21.

[0077] The water collector 100 is connected to a water supply flow path 23 through which washing water supplied from an external water source flows. A water supply valve 22 for controlling the flow rate of washing water supplied from the external water source can be installed in the water supply flow path 23. The water supply valve 22 controls the amount of washing water supplied from the external water source to the water collector 100. When the water supply valve 22 is opened, washing water supplied from the external water source can be introduced into the water collector 100 through the water supply flow path 23.

[0078] The water collector 100 can be connected to a drain flow path 24 for discharging washing water to the outside of the dishwasher. A drain pump 25 can be installed in the drain flow path 24 for discharging washing water from the water collector 100 through the drain flow path 24. When the drain pump 25 operates, the washing water stored in the water collector 100 can be discharged to the outside of the housing 11 through the drain flow path 24.

[0079] The heating device for heating the washing water can be installed inside the water collector 100 or in the washing pump 150. This heating device can be, for example, an electric heater, a heat pump system, etc.

[0080] In this implementation, a heat pump system can be used to heat the wash water. This heat pump system will be described first below.

[0081] A heat pump system is a system that pumps heat from a low-temperature environment to a high-temperature environment. In this regard, a compressor 500 can be used, for example, to achieve the heat pumping. In one implementation, the heat pump system can be implemented using a so-called two-phase flow refrigeration cycle, which raises the temperature of the refrigerant by compressing the two-phase flowing refrigerant into a gaseous state using the compressor 500.

[0082] A heat pump system for performing a two-phase flow refrigeration cycle may include a compressor 500, a condenser 300, an expander, and an evaporator 600. These components are interconnected via piping. As the refrigerant flows and circulates through these components, its phase and temperature change, allowing it to absorb or release heat from the surrounding environment.

[0083] The refrigerant can be introduced into the compressor 500 in a low-temperature gaseous state. The refrigerant is compressed in the compressor 500. From the refrigerant outlet of the compressor 500, the refrigerant can be introduced into the condenser 300 in a superheated gaseous state at high temperature and high pressure.

[0084] The refrigerant and the wash water can flow separately in the condenser 300. The refrigerant can be introduced into the condenser 300 and exchange heat with the wash water, and the wash water can be heated after receiving heat from the refrigerant.

[0085] In condenser 300, the refrigerant can undergo a phase change from a superheated gaseous state to a saturated state in which liquid and gas coexist, while the refrigerant is maintained at the theoretically same pressure.

[0086] The refrigerant flows into the condenser 300 in a superheated state, transferring heat to the wash water and thus lowering its temperature. Then, as the refrigerant reaches saturation, the liquid content can be gradually increased while the refrigerant is theoretically maintained at a constant temperature. During this liquefaction process, the refrigerant releases a large amount of latent heat of liquefaction, which the wash water absorbs and is then heated.

[0087] The refrigerant from the condenser 300 can be introduced into the expansion device in a saturated liquid or super-cooled liquid state. This expansion device can be configured as, for example, an expansion valve or a capillary tube device.

[0088] The refrigerant may undergo adiabatic expansion, meaning that its entropy remains theoretically constant within the expansion device. During this expansion, a portion of the refrigerant vaporizes, thus potentially reducing its pressure. As this portion of the refrigerant vaporizes to dissipate its heat of vaporization to the surrounding environment, the overall temperature of the refrigerant may decrease. In other words, the refrigerant can be introduced into the evaporator 600 under a low-temperature, low-pressure condition obtained while flowing through the expansion device.

[0089] When refrigerant is introduced into evaporator 600, the proportion of gas in the refrigerant can gradually increase while absorbing heat from the relatively high-temperature environment. Within evaporator 600, the proportion of gas in the refrigerant may gradually increase while theoretically maintaining the same pressure and temperature for the refrigerant.

[0090] The refrigerant discharged from the evaporator 600 can be introduced into the compressor 500 in which a small amount of liquid is present or in a slightly superheated state. The refrigerant introduced into the compressor 500 can circulate through the compressor 500, condenser 300, expansion unit and evaporator 600 while repeating the above process.

[0091] Typically, refrigeration devices utilize the principle that refrigerant absorbs heat in the evaporator 600. The heat pump system of this embodiment can utilize the heat released by the refrigerant in the condenser 300.

[0092] In a heat pump system, heat exchange occurs between the high-temperature refrigerant and the relatively low-temperature wash water in the condenser 300, thereby heating the wash water. The high-temperature wash water heated by the condenser 300 makes it easier to wash or rinse dishes than wash water at room temperature.

[0093] In this respect, the heat pump system does not always need to operate while the dishwasher is washing or rinsing. For example, when washing or rinsing with room temperature water, the compressor 500 does not operate, allowing room temperature water to be sprayed directly onto the dishes without heating the water.

[0094] Even if the compressor 500 stops operating and the wash water is not heated, the wash water can still flow through the condenser 300 and circulate throughout the dishwasher.

[0095] In another embodiment, a bypass flow path can be defined to bypass the condenser 300. Therefore, when the compressor 500 stops operating, the wash water can flow along this bypass flow path to bypass the condenser, thereby improving the performance of the condenser 300 and extending its service life.

[0096] Figure 2 This is a schematic diagram illustrating the components arranged in the base 30 of a dishwasher according to an embodiment. Components constituting the heat pump system may be arranged, for example, below the tub 12.

[0097] The dishwasher may include a base 30 disposed below the tub 12. A heat pump system and other devices for driving the dishwasher may be disposed in the base 30. The base 30 has an internal space defined therein and positioned below the tub 12, and this internal space may be used as a machine room in which various mechanical components are disposed.

[0098] The dishwasher may include a mounting portion 40 on which a condenser 300 is mounted. The mounting portion 40 may be arranged in a base 30. The mounting portion 40 may be arranged below the tub 12. The mounting portion 40 may generally be formed in the shape of a plate. Various components may be attached to the upper surface of the mounting portion 40.

[0099] The mounting portion 40 can be disposed inside the base 30. The mounting portion 40 can be easily removed from the base 30. For example, the mounting portion 40 can be mounted to the base 30 using a fastening device. This fastening device can be loosened, and the mounting portion 40 can be removed as follows: Figure 2 As indicated by the arrow, it moves in a sliding manner, thus allowing it to be removed from the base 30.

[0100] While the mounting portion 40 is guided by guide rails formed on the inner surface of the base 30, the mounting portion can slide to extend from the base 30.

[0101] The condenser 300 can be arranged on the mounting portion 40. The refrigerant and wash water can flow separately in the condenser 300. The refrigerant can be condensed in the condenser 300. The refrigerant can be condensed to release its latent heat of condensation, allowing the wash water to be heated by the heat released by the refrigerant.

[0102] Although not shown, the expansion valve can be positioned appropriately in the mounting portion 40. Since the expansion valve is smaller than the other components constituting the heat pump system, it can be appropriately positioned within the available space of the mounting portion 40.

[0103] The dishwasher may include a water softener 41 for generating soft water. The water softener 41 may be installed on the mounting portion 40. Soft water refers to water containing very few or no minerals (e.g., calcium and magnesium). When using soft water to wash dishes, the washing efficiency can be improved, and the lifespan of the dishes can be extended. Therefore, it is necessary to use soft water to wash dishes as needed.

[0104] In one embodiment, washing water can be introduced into a water softener 41, and the water can be converted into soft water using the water softener 41, which can then be used for washing dishes. However, the water softener 41 is not an essential component of a dishwasher.

[0105] The water softener 41 can be connected to the water collector 100 via a pipe. Therefore, water introduced into the water softener 41 can be softened by the water softener 41. The softened water discharged from the water softener 41 can be introduced into the water collector 100 and used for washing dishes.

[0106] The dishwasher may include a water collector 100 therein, which stores washing water. The water collector 100 may be mounted on the mounting portion 40. The water collector 100 may be arranged below the tub 12.

[0107] The washing water stored in the water collector 100 can flow under the operation of the washing pump 150, and can wash the dishes contained in the tub 12 while circulating through the water collector 100, the washing pump 150, the multiple spray arms 13, 14 and 15 and the tub 12.

[0108] In this regard, the washing water is heated by a heat pump system and sprayed at high temperature from multiple spray arms 13, 14 and 15 to wash or rinse the dishes contained in the tub 12, thereby improving washing efficiency. Furthermore, a washing pump 150 can be installed on the mounting portion 40.

[0109] Furthermore, compressor 500 can be installed on mounting section 40. Compressor 500 can be connected to condenser 300. Compressor 500 compresses refrigerant. Furthermore, evaporator 600 can be installed on mounting section 40.

[0110] As described above, the compressor 500, condenser 300, expansion device and evaporator 600 that constitute the heat pump system are interconnected by pipes, and the refrigerant may undergo a phase change as it circulates through the components that constitute the heat pump system, resulting in changes in its temperature and pressure.

[0111] In addition, when the washing pump 150 is operating, the washing water can flow sequentially through the washing pump 150, the condenser 300, the multiple spray arms 13, 14 and 15, the tank 12 and the water collector 100, and can be reintroduced into the washing pump 150 and circulated again.

[0112] The refrigerant and wash water can flow separately in the condenser 300. Therefore, heat is transferred from the high-temperature refrigerant to the wash water, thus heating the wash water while simultaneously condensing the refrigerant. To increase the contact area between the wash water and the refrigerant (i.e., the heat exchange area between them), the flow path of the wash water can be composed of multiple pipes 320.

[0113] Because multiple pipes 320 are arranged in the condenser 300, wash water can flow to a pipe with a larger diameter and then to a pipe 320 with a smaller diameter. When the pipe 320 has a relatively small diameter, blockage may occur in the pipe 320 with the smaller diameter.

[0114] With the operation of the washing pump 150, the washing water flowing through the pipe 320 can be circulated through the dishwasher. Therefore, when washing dishes, foreign objects adhering to and detaching from the surface of the dishes may be included in the circulating washing water.

[0115] When foreign matter contained in the washing water is introduced into the pipe 320, which has a smaller diameter, these foreign matter may not be able to leave the pipe 320 and instead adhere to the inner surface of the pipe 320. As the washing water circulation process continues, the amount of foreign matter adhering to the inner surface of the pipe 320 may continue to increase.

[0116] Therefore, with continuous use of the dishwasher, foreign objects will continue to accumulate inside pipe 320, which may affect the flow of wash water in condenser 300. When this phenomenon persists, at least some of pipe 320 may become blocked, causing the flow of wash water to deteriorate more quickly.

[0117] As a result, the condenser 300 may be damaged, the operation of the dishwasher may deteriorate, and in severe cases, the dishwasher may stop operating.

[0118] Therefore, a control method for detecting the accumulation of foreign matter in the condenser 300 needs to be developed. Furthermore, it is necessary to develop a method for removing the foreign matter from the condenser 300 in response to the detection of its accumulation.

[0119] In the following text, a method for controlling a dishwasher with this structure will be described in detail with reference to the accompanying drawings.

[0120] Figure 3 This is a schematic diagram illustrating a method for controlling a dishwasher according to an embodiment. Figure 4 This is a flowchart illustrating a method for controlling a dishwasher according to an embodiment. Figure 5 This is a block diagram illustrating a portion of a dishwasher according to an embodiment.

[0121] Reference Figure 5 The dishwasher according to the embodiment may include a compressor 500 for compressing refrigerant.

[0122] Thermistor 501 can be installed at the refrigerant outlet of compressor 500. Thermistor 501 can measure the temperature of the refrigerant discharged from compressor 500. In other words, thermistor 501 can measure the temperature of the refrigerant outlet of compressor 500.

[0123] The dishwasher may include a condenser 300 in fluid communication with the compressor 500. In the condenser 300, wash water and refrigerant flow separately while heat exchange can occur between the wash water and the refrigerant.

[0124] The dishwasher may include a wash pump 150 in fluid communication with a condenser 300. The wash pump 150 may deliver wash water.

[0125] The refrigerant can be compressed in compressor 500, circulated through condenser 300, expansion unit 160 and evaporator 600, and then introduced back into compressor 500. Through this cycle, a heat pump system can be implemented using refrigerant, and a two-phase refrigerant flow refrigeration cycle can be achieved.

[0126] In addition, the wash water can be pumped by the operation of the wash pump 150 to circulate through the condenser 300, the tank 12 and the collector 100, and then it can be introduced back into the pump.

[0127] In the condenser 300, heat exchange can occur between the refrigerant and the washing water. Therefore, the washing water can be heated to a high temperature. This high-temperature water can be sprayed from the spray arm onto the tableware, thus easily cleaning the tableware contained in the tub 12.

[0128] In condenser 300, the refrigerant and wash water can flow separately. The wash water can flow through pipes in condenser 300. To increase the heat exchange area between the wash water and the refrigerant, multiple pipes through which the wash water can flow can be provided. These pipes can be spaced apart from each other.

[0129] Due to this structure, the flow cross-sectional area of ​​each pipe through which the wash water flows in the condenser 300 may be narrowed. Additionally, the wash water flowing through the condenser 300 may contain foreign matter such as food residue.

[0130] When wash water flows through the narrow tubes inside the condenser 300, foreign objects may accumulate in the condenser 300. Therefore, a method for controlling a dishwasher is needed that detects when the accumulation of foreign objects in the condenser 300 reaches a level that severely hinders the operation of the dishwasher, and removes these foreign objects from the condenser 300.

[0131] In the following description, each step can be performed by the dishwasher controller 1000. The controller 1000 can be configured to be electrically connected to the compressor 500, thermistor 501, switching valve 130, and wash pump 150.

[0132] The controller 1000 can be configured to control the operation of the compressor 500. The controller 1000 can be configured to use a thermistor 501 disposed at the refrigerant outlet of the compressor 500 to measure the temperature value of the refrigerant outlet of the compressor 500.

[0133] The controller 1000 can be configured to control the operation of the switching valve 130 to selectively control which of the multiple spray arms 13, 14, and 15 to which washing water is to be supplied. For example, the controller 1000 can be configured to control the switching valve 130 to change the flow path of the washing water, thereby changing the flow of washing water to the top spray arm 15 to the upward spray arm 14.

[0134] The controller 1000 can be configured to control the operation of the washing pump 150. The controller 1000 can be configured to measure the current value applied to the washing pump 150 to operate the washing pump.

[0135] In the dishwasher control method according to the embodiment, in S110, the controller 1000 may be configured to measure the operating values ​​generated under the operation of at least one of the compressor 500 and the washing pump 150.

[0136] Next, in S120, the controller 1000 can be configured to compare the measured operating value with the set value.

[0137] In this regard, in response to an operating value exceeding a set value, the controller 1000 can be configured to determine that at least one of the compressor 500 and spray arms 13, 14, or 15 is blocked by a foreign object. However, specifically, the following steps can be performed to determine which of the compressor 500 and spray arms 13, 14, or 15 is blocked by a foreign object.

[0138] Next, in S130, in response to the operating value exceeding the set value, the controller 1000 can be configured to operate the switching valve 130 to change the location to which the washing water is to be supplied among the plurality of spray arms 13, 14 and 15.

[0139] In response to an operating value exceeding a set value, it can be determined that spray arm 13, 14, or 15 or condenser 300 is blocked by foreign matter. However, it is not yet known which of spray arm 13, 14, or 15 and condenser 300 is blocked by foreign matter. Therefore, in order to determine which of spray arm 13, 14, or 15 and condenser 300 is blocked by foreign matter, controller 1000 can be configured to operate switching valve 130 to change the spray arm 13, 14, or 15 to which washing water is to be supplied.

[0140] For example, when the top spray arm 15 is currently operating and the operating value exceeds the set value, the controller 1000 can be configured to operate the switching valve 130 to block the pipe connected to the top spray arm 15 and allow washing water to flow to the lower spray arm 13 or the upper spray arm 14.

[0141] Next, in S140, the controller 1000 can be configured to compare the operating value with the set value again. Based on the comparison results of each operating value with the set value obtained before changing the spray arm 13, 14, or 15 to which washing water is to be supplied and the operating value obtained by changing the spray arm 13, 14, or 15 to which washing water is to be supplied, the controller can determine which of the spray arm 13, 14, or 15 and the condenser 300 is blocked by foreign matter.

[0142] In S150, in response to an operating value being lower than or equal to a set value, the controller 1000 can be configured to issue an alarm or notification that the spray arms 13, 14 or 15 are blocked by foreign objects.

[0143] For example, in response to an operating value exceeding a set value, switching valve 130 is actuated to change the flow path of the washing water from a path leading to top spray arm 15 to a path leading to top spray arm 14. The operating value is then measured. In response to a measured operating value being lower than or equal to the set value, the controller can be configured to determine that top spray arm 15 is blocked by foreign matter. Therefore, controller 1000 can be configured to issue an alarm or notification indicating that spray arm 13, 14, or 15 (e.g., top spray arm 15) is blocked by foreign matter.

[0144] In S160, in response to the operating value exceeding the set value, the controller 1000 can be configured to issue an alarm or notification informing the condenser 300 that it is blocked by foreign objects.

[0145] For example, in response to an operating value exceeding a set value, switching valve 130 is actuated to change the flow path of the wash water from the path leading to the top spray arm 15 to the path leading to the upper spray arm 14. The operating value is then measured. This operating value still exceeds the set value. In this case, even though the flow path to spray arms 13, 14, or 15 is changed, the operating value still exceeds the set value. Therefore, controller 1000 can be configured to determine that spray arms 13, 14, or 15 are not blocked by foreign objects, but rather that the condenser 300 is blocked. Therefore, controller 1000 can be configured to issue an alarm or notification informing that the condenser 300 is blocked by foreign objects.

[0146] In one embodiment, the operating value can be the current value applied to the washing pump 150. For example, the controller 1000 can be configured to adjust the rotational speed of the motor installed in the washing pump 150 by changing the current value applied to the washing pump 150. Therefore, under the operation of the washing pump 150, the pressure applied to the washing water can be adjusted.

[0147] Therefore, the controller 1000 can be configured to know the current value applied to the wash pump 150. In response to the current value applied to the wash pump 150 exceeding a set value, the controller 1000 can be configured to determine that the spray arms 13, 14 or 15 or the condenser 300 is blocked by foreign objects.

[0148] When spray arms 13, 14, or 15 or condenser 300 are blocked by foreign objects, wash pump 150 may consume more current to ensure smooth flow of wash water. Therefore, as the amount of foreign object blockage in spray arms 13, 14, or 15 or condenser 300 increases, the current applied to wash pump 150 may increase.

[0149] When the spray arms 13, 14 or 15 or the condenser 300 are blocked by foreign objects to the extent that the operation of the dishwasher is interfered with, the current applied to the wash pump 150 may exceed the set value.

[0150] In this situation, the controller 1000 can be configured to determine that the spray arms 13, 14, or 15 or the condenser 300 are blocked by foreign objects. In this regard, a current value equal to a set value can be set such that, due to continuous use of the dishwasher, the blockage of the spray arms 13, 14, or 15 or the condenser 300 by foreign objects reaches a level that interrupts dishwasher operation, thus requiring separate countermeasures. In this regard, the current value equal to the set value is greater than the current value applied to the wash pump 150 under normal conditions.

[0151] During continuous use of the dishwasher, the machine learning of artificial intelligence can determine the current value that is equal to the set value.

[0152] In another embodiment, the operating value may be a temperature value measured at the refrigerant outlet of the compressor 500. This temperature value may be measured by a thermistor 501 disposed at the refrigerant outlet of the compressor 500, and the controller 1000 may be configured to know this temperature value.

[0153] When condenser 300 is blocked by foreign objects, the flow rate of the wash water in condenser 300 may decrease. Therefore, heat exchange in condenser 300 becomes unstable, causing refrigerant at a temperature higher than normal to be discharged from condenser 300. Consequently, refrigerant circulating through the components of the heat pump system may be introduced into compressor 500 at a higher than normal temperature and discharged from compressor 500 at the same time. Therefore, as the amount of foreign object blockage in condenser 300 increases, the refrigerant outlet temperature of compressor 500 may increase.

[0154] Similarly, when spray arms 13, 14, or 15 are blocked by foreign objects, the flow rate of the circulating wash water decreases, which in turn reduces the flow rate of the wash water in the condenser 300. Therefore, as the amount of foreign object blockage in spray arms 13, 14, or 15 increases, the refrigerant outlet temperature of compressor 500 may increase.

[0155] When the spray arms 13, 14, or 15 or the condenser 300 are blocked by foreign objects to the point that the operation of the dishwasher is interrupted, the temperature at the refrigerant outlet of the compressor 500 may exceed the set value.

[0156] In this situation, the controller 1000 can be configured to determine that the spray arms 13, 14, or 15 or the condenser 300 are blocked by foreign objects. As described above, a temperature value equal to the set value can be set such that it can be determined that the continuous use of the dishwasher has resulted in the spray arms 13, 14, or 15 or the condenser 300 being blocked by foreign objects to the extent that the dishwasher's operation is interrupted, thus requiring separate action. In this case, the temperature value equal to the set value is greater than the refrigerant outlet temperature of the compressor 500 operating under normal conditions.

[0157] During continuous use of the dishwasher, the temperature value equal to the set value can be obtained through artificial intelligence machine learning.

[0158] In one example, in step S150 or S160, an alarm or notification may be displayed on the dishwasher's display device, for example, in the form of text, symbols, etc., or may be made known to the user through a speaker installed in the dishwasher.

[0159] In one example, the dishwasher can be remotely connected to a mobile device carried by the user. Therefore, the dishwasher can send alarms or notifications to the mobile device, allowing the user, located remotely from the dishwasher, to receive these alarms or notifications via the mobile device.

[0160] Users can be notified of problems with spray arms 13, 14, or 15, or condenser 300, via alarms or notifications. Through this process, the controller can determine whether condenser 300 or spray arms 13, 14, or 15 are blocked by foreign objects. In response to a blockage in spray arms 13, 14, or 15, the controller can determine which of the top spray arm 15, upper spray arm 14, or lower spray arm 13 is blocked. Therefore, the dishwasher can notify the user of specific information regarding which spray arm 13, 14, or 15 is blocked. The user can then take actions such as repair.

[0161] However, even if the user does not take specific measures such as repair, the dishwasher can remove foreign objects that accumulate in the spray arms 13, 14 or 15 or the condenser 300 on its own.

[0162] In S170, the controller 1000 can be configured to remove foreign matter accumulated in the spray arms 13, 14 or 15 or the condenser 300.

[0163] In the step of removing foreign matter accumulated in the spray arm or condenser 300, the RPM (revolutions per minute) value of the motor installed in the washing pump 150 can be increased.

[0164] As the RPM value of the motor increases, the washing pump 150 can pump washing water by applying higher pressure. Therefore, the high-pressure washing water can push away foreign objects accumulated in the washing water pipes of the spray arms 13, 14 or 15 or the condenser 300, thereby effectively removing the foreign objects from the spray arms 13 or 14 or 15 or the condenser 300.

[0165] In this implementation, without adding a separate device to the dishwasher, the dishwasher can effectively detect blockages of the spray arms 13, 14, or 15 or the condenser 300 by foreign objects, and notify the user of this situation, through the operation of each of the existing compressor 500, the existing wash pump 150, and the controller 1000 for controlling the compressor and wash pump located in the dishwasher. Therefore, this provides convenience to the user.

[0166] In the method for controlling a dishwasher according to an embodiment, the operating value may be at least one of the current value applied to the washing pump 150 and the temperature value of the refrigerant outlet of the compressor 500.

[0167] The process of detecting blockages in the condenser 300 or removing foreign objects from it can be performed simultaneously with the dishwasher operation to perform the dishwashing or rinsing process.

[0168] In the following text, for example, a case will be described in detail in which both the current value applied to the washing pump 150 and the temperature value at the refrigerant outlet of the compressor 500 are used as operating values. It will also be apparent from the following description that a case in which only one of the current value and the temperature value is used as the operating value will be clear.

[0169] Figure 6 This is a flowchart illustrating a method for controlling a dishwasher according to another embodiment. The setpoint may be at least one of a first setpoint set relative to the current value applied to the wash pump 150 and a second setpoint set relative to the temperature value at the refrigerant outlet of the compressor 500.

[0170] The controller 1000 can be configured to use the thermistor 501 to measure the current value of the washing pump 150 and the temperature value of the refrigerant outlet of the compressor 500.

[0171] For example, when the operating value is a current value, the controller 1000 can be configured to determine the blockage of the spray arms 13, 14 or 15 or the condenser 300 based on the current value applied to the washing pump 150.

[0172] In response to a current value exceeding a first set value, the controller 1000 can be configured to determine that the spray arm 13, 14, or 15 or the condenser 300 is blocked by a foreign object, and issue an alarm or notification. Furthermore, the controller 1000 can be configured to automatically remove the foreign object from the spray arm 13, 14, or 15 or the condenser 300.

[0173] The temperature value may not change rapidly over a short period of time. However, during the operation of the washing pump 150, the current applied to the washing pump 150 may change rapidly due to external influences (e.g., short-term electromagnetic interference).

[0174] Therefore, the current applied to the washing pump 150 may change rapidly in a short period of time.

[0175] Therefore, in order to reduce detection errors, when the operating value is a current value, it can be determined that the spray arm or condenser 300 is blocked by foreign objects in response to the state in which the current value exceeds a first set value and is maintained for a set first duration.

[0176] The initial duration can be set to an appropriate duration designed to reduce detection errors, for example, approximately 5 to approximately 10 seconds. However, this disclosure is not limited thereto.

[0177] Since there is no problem with the current value as the operating value, the operating value is changed to a temperature value. In this case, the controller 1000 can be configured to determine the blockage of the condenser 300 based on the temperature value of the refrigerant outlet of the compressor 500.

[0178] When the temperature measured by the thermistor 501 (i.e., the temperature value at the refrigerant outlet of the compressor 500) exceeds a second set value, the controller 1000 can 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 towards the top spray arm 15 to spray the washing water, the flow path of the washing water can be changed from a flow path leading to the top spray arm to a flow path leading to the top spray arm 14.

[0179] In other words, when two conditions are met (i.e., a first condition where the current value exceeds a first set value and the state is maintained for a first duration, and a second condition where the temperature value exceeds a second set value), it can be determined that one of the spray arms 13, 14, or 15 or the condenser 300 is blocked by a foreign object. Thereafter, the process of determining which of the spray arms 13, 14, or 15 or the condenser 300 is blocked by a foreign object can continue.

[0180] In this regard, it is not fixed whether either a first condition related to the current value applied to the wash pump 150 or a second condition related to the temperature value at the refrigerant outlet of the compressor 500 is met. Therefore, the controller 1000 can be configured to first determine whether the first condition related to the current value applied to the wash pump 150 is met, and then determine whether the second condition related to the temperature value at the refrigerant outlet of the compressor 500 is met. Alternatively, the controller 1000 can be configured to first determine whether the second condition related to the temperature value at the refrigerant outlet of the compressor 500 is met, and then determine whether the first condition related to the current value applied to the wash pump 150 is met. Alternatively, the controller 1000 can be configured to determine whether the first condition related to the current value applied to the wash pump 150 is met, and simultaneously determine whether the second condition related to the temperature value at the refrigerant outlet of the compressor 500 is met.

[0181] Next, the controller 1000 can be configured to determine whether a state in which the current value exceeds a first set value is maintained for a first duration and whether the temperature value exceeds a second set value. In response to either of these conditions not being met, it can be determined that the spray arms 13, 14, or 15 are blocked by foreign objects. In this regard, for example, when the flow path has changed from a path leading to the top spray arm 15 to a path leading to the upper spray arm 14, it can be determined that the top spray arm 15 is blocked by foreign objects.

[0182] In this scenario, the controller 1000 can be configured to generate a notification that spray arms 13, 14, or 15 are blocked by foreign objects, and remove the foreign objects from spray arms 13, 14, and 15. Once the removal of foreign objects from spray arms 13, 14, and 15 is complete, the washing process returns to normal, and the current value measurement of the washing pump 150 and the temperature value measurement of the thermistor 501 can be continuously performed to monitor for blockage.

[0183] If the current value exceeds a first set value for a first duration and the temperature value exceeds a second set value, such that both conditions are met, it can be determined that the condenser 300 is blocked by foreign matter.

[0184] In this scenario, the controller 1000 can be configured to generate a notification that the condenser 300 is blocked by foreign objects, and remove the foreign objects from the condenser 300. Once the removal of the foreign objects from the condenser 300 is complete, the washing process returns to normal, and the current value measurement of the washing pump 150 and the temperature value measurement of the thermistor 501 can be continuously performed to monitor for blockage.

[0185] In this implementation, the presence of a blockage can be determined with high reliability by utilizing both the load current value of the wash pump 150 and the refrigerant outlet temperature value of the compressor. When using only the load current value of the wash pump 150, it is not possible to know exactly what caused the detector error, such as aging of the wash pump 150. When using only the refrigerant outlet temperature value of the compressor, it is impossible to distinguish various errors such as an increase in external temperature. However, when using both values, the cause of the detection error can be identified more accurately. Furthermore, when the value is measured under the control of the switching valve 130, it is possible to specify which of the top, upper, and lower spray arms 13, 14, and 15 is blocked.

[0186] Figure 7 This is a flowchart illustrating the process of issuing an alarm or notification and removing foreign objects in a method for controlling a dishwasher. Figure 7 It shows in detail, such as Figure 6 The flowchart shows the generation of a notification that the spray arm or condenser is blocked by foreign objects, and the process of removing the foreign objects.

[0187] As described above, the controller 1000 can generate a notification that the spray arms 13, 14 or 15 or the condenser 300 are blocked by foreign objects.

[0188] After an alarm or notification is issued, the controller 1000 can be configured to operate the switching valve 130 to return the flow path of the wash water to the flow path of the preceding spray arm 13, 14, or 15. For example, when the flow path has been changed from a path leading to the top spray arm 15 to a path leading to the upper spray arm 14 to determine whether the top spray arm 15 is clogged while wash water is flowing to it, the controller 1000 can be configured to control the switching valve 130 to change the flow path of the wash water from the path leading to the upper spray arm 14 back to the path leading to the top spray arm 15. Returning the flow path to the preceding spray arm can allow foreign matter to be removed from a clogged spray arm 13, 14, or 15, or allow the dishwashing process to proceed.

[0189] Next, the controller 1000 can be configured to remove foreign objects automatically. Removing foreign objects from spray arms 13, 14, or 15 and removing foreign objects from the condenser 300 can be performed using the same process and manner.

[0190] When removing foreign objects accumulated in spray arms 13, 14, or 15 or condenser 300, the motor can operate at a motor RPM value set to a third set value for a second duration. Controller 1000 can be configured to rotate the motor at high speed to remove foreign objects from spray arms 13, 14, or 15 or condenser 300.

[0191] The motor of the washing pump 150, used to remove foreign matter from the condenser 300, can be operated for a set second duration. This second duration can be appropriately selected for the duration during which foreign matter accumulated in the condenser 300 can be sufficiently removed by high-pressure washing water.

[0192] The third setting value can be a value greater than the RPM of the motor of the washing pump 150 operating under normal conditions, and can be appropriately selected within a range that will not cause damage to the washing pump 150.

[0193] Through the above process, the dishwasher can use the wash pump 150 to apply high-pressure wash water to the spray arms 13, 14, or 15 or the pipes through which the wash water flows inside the condenser 300. Therefore, foreign matter accumulated in the spray arms 13, 14, or 15 or the condenser 300 can be effectively removed by the pressure of the wash water. Thus, the dishwasher can use the wash pump 150 installed within the dishwasher to remove foreign matter from the spray arms 13, 14, and 15 or the pipes in the condenser 300 without the need for a separate device. This provides convenience for the user.

[0194] In addition, it is necessary to check whether foreign objects have been sufficiently removed from the condenser 300. If foreign objects are not sufficiently removed, the foreign object removal step may be repeated multiple times.

[0195] In response to the current value applied to the washing pump 150 exceeding a first set value after the operation of the motor used for removing foreign objects is terminated, the controller 1000 can be configured to operate the motor again for a second duration at a motor RPM value set to a third set value.

[0196] In this regard, if the current value exceeds a first set value and remains for a first duration, the motor can be operated again.

[0197] The foreign object removal operation can be terminated, and the motor's RPM value can be restored to the value before the removal operation. That is, when the foreign object removal operation is completed, the motor will not stop, but will rotate to the RPM set under normal conditions (i.e., the state where the spray arms 13, 14 or 15 or the condenser 300 are not blocked by foreign objects), allowing the dishwasher to continue the washing or rinsing process.

[0198] In this regard, in order to check whether the problem of the spray arm 13, 14 or 15 or the condenser 300 being blocked by foreign objects is solved by adequately removing foreign objects from the spray arm 13, 14 or 15 or the condenser 300, the controller 1000 can be configured to check the current value applied to the washing pump 150.

[0199] In response to the current applied to the washing pump 150 exceeding a first set value and remaining in such a state for a first duration, the controller 1000 can be configured to determine that the condenser 300 is still blocked by foreign matter.

[0200] Therefore, the controller 1000 can be configured to operate the motor again at the RPM value of the motor set to the third set value for a second duration.

[0201] The process of removing foreign objects from the condenser 300 and checking whether the foreign objects have been sufficiently removed can be repeated multiple times. The foreign object removal process can be terminated when the foreign objects have been sufficiently removed from the condenser 300 through multiple processes. Once the foreign object removal process is complete, the dishwasher can continue with either the washing or rinsing process.

[0202] In another embodiment, when checking whether foreign matter has been sufficiently removed from the condenser 300, it can be determined whether the foreign matter has been sufficiently removed from the condenser 200 based on whether the temperature value of the refrigerant outlet of the compressor 500 exceeds a second set value. Details are as described above.

[0203] In this implementation, when the spray arms 13, 14, or 15 or the condenser 300 are detected to be clogged with foreign objects, the dishwasher can effectively remove the foreign objects from the spray arms 13, 14, or 15 or the condenser 300 by repeatedly removing the foreign objects from the spray arms 13, 14, or 15 or the condenser 300 and repeatedly checking whether the foreign objects have been sufficiently removed. Therefore, this provides convenience for the user.

[0204] On the other hand, in response to the fact that the foreign matter is not sufficiently removed even if the process of removing foreign matter accumulated in the spray arms 13, 14 and 15 or the condenser 300 and the process of checking whether the foreign matter has been sufficiently removed are performed a set number of times, the controller 1000 can be configured to issue an alarm or notification to the user that the removal has failed.

[0205] Foreign object removal and verification that the foreign objects have been fully removed cannot be repeated indefinitely. Even after repeatedly performing the foreign object removal steps, the foreign objects may not be fully removed. This is because the process of removing foreign objects using the dishwasher itself cannot remove the foreign objects accumulated in the condenser 300.

[0206] Therefore, in response to the fact that the foreign object is not sufficiently removed even after the foreign object removal step has been repeated a set number of times, the controller 1000 can be configured to issue a separate alarm or notification to the user regarding the removal failure.

[0207] Upon receiving an alarm or notification of removal failure, the user may realize that the foreign object was not adequately removed during the dishwasher's automatic removal process from the condenser 300. Therefore, the user can directly repair or replace the condenser 300.

[0208] The present disclosure has been described above with reference to the accompanying drawings illustrated herein. However, the present disclosure is not limited to the embodiments and drawings disclosed herein, and it will be apparent to those skilled in the art that various modifications can be made to it within the scope of the technical concept of the present disclosure. Furthermore, even if the effects of the configuration according to the present disclosure are not explicitly described and explained in the description of the embodiments of the present disclosure, it should be apparent that the predictable effects arising therefrom should be appreciated.

Claims

1. A method for controlling a dishwasher, the dishwasher comprising: A bucket, the bucket being configured to hold tableware therein; A spray arm is arranged in the bucket and configured to spray washing water onto the tableware, wherein the spray arm includes a plurality of spray arms positioned at different locations. Compressors used to compress refrigerants; A condenser, in fluid communication with the compressor, wherein heat exchange occurs between the wash water and the refrigerant while the wash water and the refrigerant flow separately within the condenser; and A washing pump, which is in fluid communication with the condenser and is configured to deliver the washing water, The method includes the following steps: Measure the operating values ​​generated under the operation of at least one of the compressor and the washing pump; Compare the operation value with the set value; and In response to the operating value exceeding the set value, it is determined that at least one of the compressor and the spray arm is blocked by a foreign object.

2. The method according to claim 1, wherein, The dishwasher includes a switching valve configured to operate such that the washing water is selectively supplied to at least one of the plurality of spray arms; The method further includes the following steps: 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 can be supplied; Measure the operating value generated under the operation of at least one of the compressor and the washing pump after the change; and The measured operational value after the change is compared with the set value.

3. The method according to claim 1, wherein, The operating value is the current value applied to the washing pump.

4. The method according to claim 1, wherein, The operating value is the temperature of the refrigerant outlet of the compressor.

5. The method according to claim 1, wherein, The operating value is at least one of the current applied to the washing pump and the temperature at the refrigerant outlet of the compressor.

6. The method according to claim 5, wherein, The setting value is at least one of a first setting value set with respect to the current value applied to the washing pump and a second setting value set with respect to the temperature value at the refrigerant outlet of the compressor.

7. The method according to claim 2, wherein, The method further includes the following steps: In response to the operating value being lower than or equal to the set value, an alarm or notification is issued informing that the spray arm is blocked by foreign objects; and In response to the operating value exceeding the set value, an alarm or notification is issued indicating that the condenser is blocked by foreign objects.

8. The method according to claim 7, wherein, The operating value is the current value applied to the washing pump, and the setting value is a first setting value set with respect to the current value applied to the washing pump. Specifically, in response to the current value exceeding the first set value being maintained for a set first duration, the alarm or notification is issued.

9. The method according to claim 2, wherein, The method further includes the step of removing the foreign matter accumulated in the spray arm or the condenser.

10. The method according to claim 9, wherein, When removing the foreign matter accumulated in the spray arm or the condenser, the revolutions per minute (RPM) value of the motor installed in the washing pump is increased.

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