WO2019190114A1 - 냉장고 및 그 제어방법 - Google Patents
냉장고 및 그 제어방법 Download PDFInfo
- Publication number
- WO2019190114A1 WO2019190114A1 PCT/KR2019/003206 KR2019003206W WO2019190114A1 WO 2019190114 A1 WO2019190114 A1 WO 2019190114A1 KR 2019003206 W KR2019003206 W KR 2019003206W WO 2019190114 A1 WO2019190114 A1 WO 2019190114A1
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- WO
- WIPO (PCT)
- Prior art keywords
- temperature
- value
- sensing
- heating element
- temperature difference
- Prior art date
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/002—Defroster control
- F25D21/006—Defroster control with electronic control circuits
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/02—Detecting the presence of frost or condensate
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
- F25D29/008—Alarm devices
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/11—Sensor to detect if defrost is necessary
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/08—Removing frost by electric heating
Definitions
- the present specification relates to a refrigerator and a control method thereof.
- a refrigerator is a home appliance that can store an object such as food at a low temperature in a storage compartment provided in a cabinet. Since the storage compartment is surrounded by a heat insulating wall, the interior of the storage compartment may be maintained at a temperature lower than an external temperature.
- the storage compartment may be divided into a refrigerating compartment or a freezing compartment according to the temperature band of the storage compartment.
- the refrigerator may include an evaporator for supplying cold air to the storage compartment.
- the air in the storage compartment flows to the space where the evaporator is located and is cooled in a heat exchange process with the evaporator, and the cooled air is supplied to the storage compartment again.
- frost acts as a flow resistance of the air
- the refrigerator further includes defrosting means for defrosting the evaporator.
- the defrost cycle is adjusted using the cumulative operating time of the compressor and the outside air temperature.
- the amount of implantation of the evaporator may be large or small.
- the disadvantage of determining the defrosting cycle is not reflected in the various environments. have.
- An object of the present invention is to provide a refrigerator capable of determining a defrosting operation time point using a parameter that depends on the amount of implantation of an evaporator and a control method thereof.
- An object of the present invention is to provide a refrigerator and a control method thereof capable of accurately determining a defrosting necessary time according to the amount of implantation of an evaporator by using a sensor whose output value differs depending on the flow rate of air.
- An object of the present invention is to provide a refrigerator capable of accurately determining a defrosting point and a control method thereof even when the accuracy of the sensor used to determine the defrosting point is low.
- An object of the present invention is to provide a refrigerator capable of detecting clogging of an air flow path of a refrigerator using a sensor having an output value different according to the flow rate of air, and a control method thereof.
- An object of the present invention is to provide a refrigerator and a control method thereof capable of accurately determining the cause of an air passage blockage based on an output value of a sensor.
- the control method of the refrigerator for solving the above problems is based on the temperature difference value between the first sensing temperature Ht1, which is the lowest value, and the second sensing temperature Ht2, which is the highest value, among the sensing temperatures of the heating element. It may include detecting the blockage of the flow path of the air in the heat exchange space.
- the first sensing temperature Ht1 is a temperature detected by the sensing element of the sensor immediately after the heating element is turned on
- the second sensing temperature Ht2 is the sensor immediately after the heating element is turned off. It may be the temperature detected by the sensing element of.
- the first sensing temperature Ht1 may be a minimum temperature value during the time when the heating element is turned on
- the second sensing temperature Ht2 may be a maximum temperature value during the time when the heating element is turned on.
- the defrosting operation of the evaporator may be performed.
- the updated temperature difference value is less than the second reference value, it is determined whether the updated temperature difference value is less than a third reference value smaller than the second reference value, and when the updated temperature difference value exceeds the third reference value, The passage blockage in the heat exchange space can be indicated.
- the passage blockage display indicates at least one of the blockage of the cold air inlet or cold air discharge hole of the cold air duct forming the heat exchange space, the blockage of the blower fan provided in the cold air duct, or the blockage of the bypass passage. It involves doing.
- the evaporator When the updated temperature difference value is less than a third reference value, it is determined whether the updated temperature difference value is less than a fourth reference value smaller than a third reference value, and when the updated temperature difference value is less than a fourth reference value, the evaporator The defrosting operation can be performed again.
- the updated temperature difference value is less than a fourth reference value, it is determined whether the updated temperature difference value is increased by a predetermined value or more relative to the temperature difference value before the update, and before the updated temperature difference value is updated. If the temperature increases by more than a predetermined value, the defrosting operation of the evaporator may be performed again.
- the defrosting operation of the evaporator may be performed again according to whether the updated temperature difference value is less than a first reference value. Can be.
- a refrigerator for solving the above problems includes a bypass passage for allowing air to flow by bypassing an evaporator, a heating element disposed in the bypass passage, and a sensor including a sensing element sensing a temperature of the heating element. And based on a temperature difference between the lowest first sensing temperature Ht1 and the highest second sensing temperature Ht2 among the sensing temperatures of the heating element, clogging air passages in the heat exchange space. It may include a control unit for detecting.
- the defrosting necessary time is determined by using a sensor whose output value varies according to the amount of implantation of the evaporator in the bypass passage, there is an advantage in that the defrosting necessary time can be accurately determined.
- FIG. 1 is a longitudinal sectional view schematically showing the configuration of a refrigerator according to one embodiment of the present invention
- Figure 2 is a perspective view of the cold air duct according to an embodiment of the present invention.
- FIG. 3 is an exploded perspective view showing a state in which a flow path cover and a sensor are separated from a cold air duct;
- FIG. 4 is a diagram showing air flow in a heat exchange space and a bypass flow path before and after implantation of an evaporator
- FIG. 5 is a view schematically showing a state where a sensor is disposed in a bypass flow path.
- FIG. 6 illustrates a sensor according to an embodiment of the present invention.
- FIG. 7 is a diagram showing thermal flow around a sensor according to the flow rate of air flowing through a bypass flow path.
- FIG. 8 is a control block diagram of a refrigerator according to one embodiment of the present invention.
- FIG. 9 is a flowchart illustrating a method of performing a defrosting operation by determining a defrost need time of a refrigerator according to an embodiment of the present invention.
- FIG. 10 is a view showing the temperature change of the heating element according to the on / off of the heating element before and after the implantation of the evaporator according to an embodiment of the present invention.
- FIG. 11 is a flowchart schematically illustrating a method of detecting an air passage blockage of a refrigerator in accordance with one embodiment of the present invention.
- FIG. 12 is a flowchart illustrating a detailed method of detecting a blockage of an air passage in a refrigerator according to an embodiment of the present invention.
- first, second, A, B, (a), and (b) may be used. These terms are only for distinguishing the components from other components, and the nature, order or order of the components are not limited by the terms. If a component is described as being “connected”, “coupled” or “connected” to another component, that component may be directly connected or connected to that other component, but between components It will be understood that may be “connected”, “coupled” or “connected”.
- FIG. 1 is a vertical cross-sectional view schematically showing the configuration of a refrigerator according to an embodiment of the present invention
- Figure 2 is a perspective view of a cold air duct according to an embodiment of the present invention
- Figure 3 is a flow path cover and sensor in the cold air duct An exploded perspective view showing the separated state.
- the refrigerator 1 may include an inner case 12 forming a storage compartment 11.
- the storage compartment 11 may include one or more of a refrigerating compartment and a refrigerating compartment.
- a cold air duct 20 is formed in the rear space of the storage compartment 11 to form a flow path through which cold air supplied to the storage compartment 11 flows.
- An evaporator 30 is disposed between the cold air duct 20 and the rear wall 13 of the inner case 12. That is, a heat exchange space 222 in which the evaporator 30 is disposed is defined between the cold air duct 20 and the rear wall 13.
- the air in the storage compartment 11 flows into the heat exchange space 222 between the cold air duct 20 and the rear wall 13 of the inner case 12 to exchange heat with the evaporator 30, and the cold air After flowing inside the duct 20, it is supplied to the storage chamber 11.
- the cold air duct 20 may include, but is not limited to, a first duct 210 and a second duct 220 coupled to a rear surface of the first duct 210.
- the front surface of the first duct 210 faces the storage chamber 11, and the rear surface of the first duct 220 faces the rear wall 13 of the inner case 12.
- a cold air passage 212 may be formed between the first duct 210 and the second duct 220 in a state in which the first duct 210 and the second duct 220 are coupled to each other.
- the cold air inlet hole 221 may be formed in the second duct 220, and the cold air discharge hole 211 may be formed in the first duct 210.
- the cold air passage 212 may be provided with a blowing fan (not shown). Therefore, when the blowing fan is rotated, air passing through the evaporator 13 flows into the cold air flow path 212 through the cold air inlet hole 221, and the storage chamber 11 through the cold air discharge hole 211. To be discharged.
- the evaporator 30 may be located between the cold air duct 20 and the rear wall 13, and the evaporator 30 may be located below the cold air inlet hole 221.
- the air of the storage chamber 11 is introduced into the cold air inlet hole 221 after the heat exchange with the evaporator 30 while rising.
- the defrosting necessary time of the evaporator 30 may be determined by using a parameter that changes according to the amount of implantation of the evaporator 30.
- an implantation sensing device for determining a defrost need time using a sensor whose output is different according to the flow rate of the air. It may further include.
- the implantation detecting apparatus may include a bypass passage 230 for bypassing at least a portion of the heat exchange space 222 and a sensor 270 positioned on the bypass passage 230. .
- bypass flow path 230 may be formed to be recessed in the first duct 210.
- bypass flow path 230 may be provided in the second duct 220.
- the bypass flow path 230 may be formed as a portion of the first duct 210 or the second duct 220 is recessed in a direction away from the evaporator 30.
- the bypass flow path 230 may extend in the vertical direction from the cold air duct 20.
- the bypass flow path 230 may face the evaporator 30 within a left and right width range of the evaporator 30 so that the air in the heat exchange space 222 may be bypassed to the bypass flow path 230. Can be deployed.
- the implantation detecting apparatus may further include a flow path cover 260 for allowing the bypass flow path 230 to be partitioned from the heat exchange space 222.
- the flow path cover 260 may be coupled to the cold air duct 20 and may cover at least a portion of the bypass flow path 230 extending upward and downward.
- the flow path cover 260 may include a cover plate 261, an upper extension part 262 extending from an upper side of the cover plate 261, and a barrier 263 provided below the cover plate 261. Can be.
- FIG. 4 is a diagram showing air flow in a heat exchange space and a bypass flow path before and after implantation of an evaporator.
- FIG. 4 (a) shows the air flow before implantation
- FIG. 4 (b) shows the air flow after implantation.
- this embodiment for example, it is assumed that after the defrosting operation is completed, the state before the implantation.
- the flow rate (or flow rate) of air flowing through the bypass flow path 230 varies according to the amount of implantation of the evaporator 30.
- the sensor 270 the output value is changed according to the change in the flow rate of the air flowing through the bypass flow path 230, it can be determined whether or not defrosting based on the change in the output value.
- FIG. 5 is a view schematically showing a state in which a sensor is disposed in the bypass flow passage
- FIG. 6 is a view showing a sensor according to an embodiment of the present invention
- FIG. 7 is a flow rate of air flowing through the bypass flow passage.
- Figure is a view showing the heat flow around the sensor according.
- the senor 270 may be disposed at a point in the bypass flow path 230. Accordingly, the sensor 270 may be in contact with air flowing along the bypass flow path 230, and the output value may be changed in response to a change in the flow rate of air.
- the sensor 270 may be disposed at a position spaced apart from each of the inlet 231 and the outlet 232 of the bypass flow path 230.
- the sensor 270 may be disposed at an intermediate point of the bypass flow path 230.
- the sensor 270 may face the evaporator 30 within a left and right width range of the evaporator 30.
- the sensor 270 may be, for example, a heating temperature sensor.
- the sensor 270 includes a sensor PC 271, a heating element 273 installed in the sensor PC 271, and a temperature of the heating element 273 provided in the sensor PC 271. It may include a sensing element 274 for sensing.
- the heat generating element 273 may be a resistor that generates heat when a current is applied.
- the sensing element 274 may sense the temperature of the heating element 273.
- the sensor PCB 271 may include a temperature detected by the sensing element 274 in the off state of the heating element 273, and a temperature detected by the sensing element 274 in the on state of the heating element 273. You can judge the difference.
- the sensor PC 271 may determine whether a temperature difference value (for example, a maximum value) in the on / off state of the heating element 273 is less than or equal to the reference difference value.
- a temperature difference value for example, a maximum value
- the temperature detected by the sensing element 274 is smaller than the temperature sensed by the sensing element 274 when the amount of implantation of the evaporator 30 is small.
- a difference between a temperature detected by the sensing element 274 when the heating element 273 is turned on and a temperature detected by the sensing element 274 when the heating element 273 is turned off is a reference temperature difference. If it is below, it can be judged that defrost is necessary.
- the sensor 270 detects a change in the temperature of the heating element 273 that is varied by the air whose flow rate is variable according to the amount of implantation, and thus defrosting according to the amount of implantation of the evaporator 30. Accurately determine the time required.
- the sensor 270 is a sensor housing 272 such that air flowing through the bypass flow path 230 is prevented from directly contacting the sensor PC 271, the heating element 273, and the temperature sensor 274. It may further include.
- the wire connected to the sensor PCB 271 may be drawn out of the sensor housing 272 in an open state of one side thereof, and the opened part may be covered by a cover part.
- the sensor housing 271 may surround the sensor PCB 271, the heat generating element 273, and the temperature sensor 274.
- FIG. 8 is a control block diagram of a refrigerator according to one embodiment of the present invention.
- the refrigerator 1 compresses the sensor 270 described above, the defrosting device 50 operating for defrosting the evaporator 30, and a refrigerant.
- a control unit 40 for controlling the compressor 60, a blower fan 70 for generating air flow, and the sensor 270, the defrosting device 50, the compressor 60, and the blower fan 70. It may include.
- the defrosting device 50 may include a heater as an example. When the heater is turned on, heat generated by the heater is transferred to the evaporator 30 to melt frost generated on the surface of the evaporator 30.
- the heater may be connected to one side of the evaporator 30, or may be spaced apart from the position adjacent to the evaporator 30.
- the defrost apparatus 50 may further include a defrost temperature sensor.
- the defrost temperature sensor detects an ambient temperature of the defrost device 50.
- the temperature value detected by the defrost temperature sensor may be used as a factor for determining an on or off time point of the heater.
- the compressor 60 is a device for compressing a low temperature low pressure refrigerant into a high temperature high pressure supersaturated gaseous refrigerant. Specifically, the high temperature and high pressure supersaturated gaseous refrigerant compressed by the compressor 60 flows into a condenser (not shown) to condense into a high temperature and high pressure saturated liquid refrigerant. Flows into the two-phase refrigerant at low temperature and low pressure.
- the low-temperature, low-pressure two-phase refrigerant is evaporated into the low-temperature, low-pressure gas phase refrigerant while passing through the evaporator 30.
- the refrigerant flowing through the evaporator 30 exchanges heat with external air, that is, air flowing through the heat exchange space 222, thereby cooling the air.
- the blowing fan 70 is provided in the cold air passage 212 to generate a flow of air. Specifically, when the blowing fan 70 is rotated, air passing through the evaporator 30 is introduced into the cold air flow path 212 through the cold air inlet hole 221, and through the cold air discharge hole 211. It is discharged to the storage chamber 11.
- the controller 40 may control the heating element 273 of the sensor 270 to be turned on at a predetermined cycle.
- the heating element 273 may be in an on state for a predetermined time, and the sensing element 274 may sense a temperature of the heating element 273.
- the heating element 274 may be turned off, and the sensing element 274 may sense the temperature of the turned off heating element 273.
- the sensor PC 263 may determine whether the maximum value of the temperature difference value of the on / off state of the heating element 273 is equal to or less than the reference difference value.
- the defrosting device 50 may be turned on by the controller 40.
- the sensor PC 263 determines whether the temperature difference value of the on / off state of the heating element 273 is equal to or less than a reference difference value.
- the control unit 40 determines that the heating element ( It may be determined whether the temperature difference value in the on / off state of 273 is equal to or less than the reference difference value, and the defrosting device 50 may be controlled according to the determination result. That is, the sensor PC 263 and the controller 40 may be in an electrically connected state.
- the controller 40 detects a temperature of the heat generating element 273 while the heat generating element 273 is turned on or off, and among the sensing temperatures of the heat generating element 273, a first sensing temperature and The clogging of the air passage can be detected based on the temperature difference value of the two sensing temperatures.
- the first sensing temperature is a sensing temperature detected by the sensing element 274 immediately after the heating element 273 is turned on, and the second sensing temperature is immediately after the heating element 273 is turned off, It may be a temperature sensed by the sensing element 274.
- the first sensing temperature may be a minimum temperature value during a time when the heating element 273 is turned on
- the second sensing temperature may be a maximum temperature value during a time when the heating element 273 is turned on.
- FIG. 9 is a flowchart illustrating a method of performing defrosting operation by determining a defrost need time of a refrigerator according to an embodiment of the present disclosure.
- FIG. 10 is a view illustrating a heating element before and after implantation of an evaporator according to an embodiment of the present disclosure. A diagram showing a temperature change of the heating element according to the on / off.
- step S21 the heat generating element 27 is turned on.
- the heat generating element 273 may be turned on in a state in which a cooling operation of the storage compartment 11 (eg, a freezing compartment) is being performed.
- the state in which the cooling operation of the freezer compartment is performed may mean a state in which the compressor 60 and the blower fan 70 are driven.
- the detection accuracy of the sensor 260 may be improved. That is, if the flow rate of the air is large according to a large amount or a small amount of the amount of implantation of the evaporator 30, the amount of change in temperature sensed by the sensor 270 is increased, so that the determination of the defrosting necessary time may be accurate.
- the accuracy of the sensor can be increased only by detecting the idea of the evaporator 30 in a state where air flow is generated, that is, while the blower fan 70 is being driven.
- the heat generating element 273 may be turned on at any point in time S1 during which the blowing fan 70 is being driven.
- the blowing fan 70 may be driven for a predetermined time to cool the freezing compartment. At this time, the driving of the compressor 60 may be performed at the same time. Therefore, when the blowing fan 70 is driven, the temperature Ft of the freezing compartment is lowered.
- the temperature sensed by the sensing element 274, that is, the temperature Ht of the heating element 273 increases rapidly.
- step S22 it is determined whether the blowing fan 70 is turned on.
- the sensor 270 detects a change in temperature of the heating element 273 that is varied by air whose flow rate varies according to the amount of implantation of the evaporator 30. Therefore, if air flow does not occur, it becomes difficult for the sensor 270 to accurately detect the amount of implantation of the evaporator 30.
- step S23 the temperature Ht1 of the heating element is detected.
- the heating element 273 may be turned on for a predetermined time, and at some point in time when the heating element 273 is turned on, the temperature Ht1 of the heating element is detected by the sensing element 273. do.
- the temperature Ht1 of the heat generating element 273 may be sensed when the heat generating element 273 is turned on. That is, the present invention senses the temperature immediately after the heating element 273 is turned on. Therefore, the sensing temperature Ht1 of the heating element may be defined as the lowest temperature when the heating element 273 is turned on.
- the first sensed temperature of the heat generating element 273 may be referred to as a "first sensing temperature Ht1.”
- step S24 it is determined whether the first reference time T1 has elapsed while the heat generating element 273 is turned on.
- the temperature detected by the sensing element 274, that is, the temperature Ht1 of the heating element 273 may continue to increase.
- the temperature of the heating element 273 may gradually increase and converge to the highest temperature point.
- the temperature of the heating element 273 may be sensed when the heating element 273 is turned on. That is, in the present invention, it can be understood that the lowest temperature value of the heating element 273 is detected after the heating element 273 is turned on.
- the first reference time T1 during which the heat generating element 273 is kept in an on state may be three minutes, although not limited thereto.
- step S25 the heat generating element 273 is turned off.
- the heat generating element 273 may be turned on after being turned on for the first reference time T1.
- the heat generating element 273 may be rapidly cooled by air flowing through the bypass flow path 230. Therefore, the temperature Ht of the heat generating element 273 drops rapidly.
- step S26 the temperature Ht2 of the heating element is sensed.
- the temperature Ht2 of the heat generating element is sensed by the sensing element 273.
- the temperature Ht2 of the heat generating element can be detected when the heat generating element 273 is turned off. That is, the present invention senses the temperature immediately after the heat generating element 273 is turned off. Therefore, the sensing temperature Ht2 of the heating element may be defined as the maximum temperature in the state in which the heating element 273 is turned off.
- the second sensed temperature of the heat generating element 273 may be referred to as a “second sensing temperature Ht2”.
- the temperature Ht of the heat generating element is first detected at the time S1 at which the heat generating element 273 is turned on, and then additionally detected at the time S2 at which the heat generating element 273 is turned off.
- the first sensing temperature Ht1 detected for the first time becomes the lowest temperature when the heating element 273 is turned on, and the second sensing temperature Ht2 that is additionally sensed is determined by the heating element 273. It can be the highest temperature in the off state.
- step S27 it is determined whether or not the temperature stabilization state is achieved.
- the temperature stabilized state may mean a state in which a high internal load is not generated, that is, a state in which the storage chamber is cooled normally.
- the temperature stabilization state may mean, for example, that the refrigerator door is not opened or closed, or a component (eg, a compressor, an evaporator, etc.) or a sensor 270 for cooling the storage compartment is not defective.
- the sensor 270 may accurately detect the amount of implantation of the evaporator 30.
- to determine the temperature stabilization state it is possible to determine the amount of change in the freezer compartment temperature for a predetermined time. Or alternatively, in order to determine the temperature stabilization state, it is possible to determine the amount of change in the evaporator 30 temperature for a predetermined time.
- a state in which the amount of change in the freezer compartment temperature or the evaporator 30 temperature for a predetermined time does not exceed 1.5 degrees may be defined as a temperature stabilized state.
- the temperature Ht of the heat generating element decreases sharply, and then the temperature Ht of the heat generating element may gradually decrease.
- step S28 the temperature difference between the temperature Ht1 detected when the heating element 273 is turned on and the temperature Ht2 detected when the heating element 273 is turned off Calculate the value ⁇ Ht.
- step S29 it is determined whether the temperature difference value DELTA Ht is less than a first reference temperature value.
- the amount of the frost of the evaporator 30 when the amount of the frost of the evaporator 30 is large, the flow rate of the air flowing in the bypass flow path 230 increases, so that the heat generating element 273 is formed by the air flowing in the bypass flow path 230.
- the amount of cooling is increased.
- the temperature Ht2 of the heat generating element sensed immediately after the heat generating element 273 is turned off becomes relatively low as compared with the case where the amount of implantation of the evaporator 30 is small.
- the degree of implantation of the evaporator 30 may be determined based on the temperature difference value ⁇ Ht.
- the first reference temperature value may be, for example, 32 degrees.
- step S30 when the temperature difference value ⁇ Ht is less than the first reference temperature value, in step S30, the defrosting operation is performed.
- the defrosting device 50 When the defrosting operation is performed, the defrosting device 50 is driven and heat generated by the heater is transferred to the evaporator 30 to melt frost generated on the surface of the evaporator 30.
- step S27 if the temperature stabilization state is not achieved in step S27 or if the temperature difference value DELTA Ht is equal to or greater than the first reference temperature value in step S29, the algorithm is terminated without performing defrosting operation.
- the temperature difference value ⁇ Ht may be defined as “logic temperature” for the detection of implantation.
- the logic temperature may be used as a temperature for determining a defrosting operation timing of the refrigerator, and may be used as a temperature for detecting a blockage of an air flow path to be described later.
- the blockage of the air flow path refers to a blockage of a flow path where cold air circulating inside the refrigerator flows, that is, a cold air inlet hole 221 or a cold air discharge hole of the cold air duct 20 forming the heat exchange space 222. At least one of the blockage of 211, the blockage of the blower fan 70 provided in the cold air duct 20, or the blockage of the bypass flow path 230 may be included.
- the cold air inlet hole 221, the cold air discharge hole 211, the blowing fan 70, and the bypass flow path 230 may be clogged by moisture due to condensation of water contained in the air. As described above, when the air flow path blockage occurs due to frost growth, air flow resistance occurs and as a result, heat exchange efficiency of the evaporator is reduced and power consumption is increased.
- the present invention is characterized by diagnosing the cause of clogging of the air flow path of the refrigerator and taking appropriate measures accordingly.
- FIG. 11 is a flowchart schematically illustrating a method of detecting a blockage of an air flow path of a refrigerator according to an embodiment of the present disclosure.
- step S41 the heating element 273 is operated for a predetermined time.
- the heating element 273 may be turned off after being turned on for a predetermined time.
- the heating element 273 may be turned on for three minutes.
- step S43 the controller 40 senses the temperature of the heat generating element 273 while the heat generating element 273 is turned on or off.
- the controller 40 may sense the temperature of the heating element 273 immediately after the heating element 273 is turned on and immediately after the heating element 273 is turned off.
- the controller 40 may sense the temperature of the heat generating element 273 while the heat generating element 273 is turned on.
- step S45 the control unit 40 blocks the flow path of the air based on the temperature difference between the first sensing temperature which is the lowest value and the second sensing temperature which is the highest value among the sensing temperatures of the heating element 273. Detect.
- the method of detecting the amount of implantation of the evaporator 30 according to the temperature difference between the first sensing temperature of the heating element 273 and the second sensing temperature, that is, the logic temperature ⁇ Ht has been described above. .
- the logic temperature ⁇ Ht is less than the reference value and the defrosting operation is performed, but the logic temperature ⁇ Ht is still maintained at a low level, it may be determined that blockage of the air flow path of the refrigerator occurs.
- the blockage of the air flow path means that at least one or more of the cold air inflow hole 221, the cold air discharge hole 211, the blower fan 70, and the bypass flow path 230 are blocked. It is difficult to solve the air flow path clogging by this. That is, when the air flow path blockage occurs, frost formed in the cold air inlet hole 221, the cold air discharge hole 211, the blower fan 70, and the bypass flow path 230 may not be removed even when the defrosting operation is performed. Therefore, when it is determined that the air flow path is blocked, it is possible to immediately notify the user, it is possible to solve the air flow blockage.
- FIG. 12 is a flowchart illustrating a detailed method of detecting an air passage blockage of a refrigerator according to an embodiment of the present invention.
- step S51 the logic temperature ⁇ Ht is updated.
- updating the logic temperature ⁇ Ht means performing steps S21 to S28 of FIG. 9 described above again.
- updating the logic temperature may mean that the steps S21 to S28 of FIG. 9 described above are first performed.
- step S52 the controller 40 determines whether the updated logic temperature ⁇ Ht is less than the second reference temperature value.
- the second reference temperature value may be greater than the first reference temperature value.
- the second reference temperature value may be 50 degrees, but is not limited thereto.
- the reason for determining whether the updated logic temperature ⁇ Ht is less than the second reference temperature value is to determine whether the updated logic temperature ⁇ Ht is within a normal range. That is, when the updated logic temperature ⁇ Ht does not exist within the normal range, that is, when the updated logic temperature ⁇ Ht has an abnormally large value, it may be determined that a failure has occurred in the sensor 270. have.
- a failure of the sensor 270 may be caused by a short circuit in the heating element 273, a short circuit in the sensing element 274, or a freezing of the heating element 273. May include cases. In this case, the sensor 270 needs to be repaired or replaced.
- step S53 the controller 40 displays a failure of the sensor 270.
- step S54 the controller 40 performs defrosting operation. That is, when a failure occurs in the sensor 270, the defrosting operation is normally performed.
- step S55 the controller 40 determines whether the updated logic temperature ⁇ Ht is less than the third reference temperature value.
- the third reference temperature value may be a value smaller than the second reference temperature value.
- the third reference temperature value may be 45 degrees, but is not limited thereto.
- the reason for determining whether the updated logic temperature ⁇ Ht is less than the third reference temperature value is to detect clogging of the air flow path of the refrigerator 1.
- the air flow path of the refrigerator 1 that is, the cold air inlet hole 221, the cold air discharge hole 211, the blowing fan 70 and the bypass flow path 230
- the flow rate or flow rate of the abruptly decreases, and as a result, the flow rate of the air flowing into the bypass flow path 230 is reduced rapidly. Therefore, since the flow rate of air flowing into the bypass flow path 230 decreases, the temperature of the heat generating element 273 sensed while the heat generating element 273 is turned on is rapidly increased.
- step S56 If the updated logic temperature ⁇ Ht exceeds the third reference temperature value, it is determined in steps S56 and S57 whether the updated logic temperature ⁇ Ht exceeds the third reference temperature value for the first time. .
- step S54 the controller 40 performs defrosting operation.
- step S58 if the updated logic temperature ⁇ Ht does not exceed the third reference temperature value for the first time, that is, it is determined that the air flow path clogging still occurs, in step S58, The controller 40 displays the blockage of the flow path and then performs defrosting operation.
- step S59 the controller 40 determines whether the updated logic temperature ⁇ Ht is less than the fourth reference temperature value.
- the fourth reference temperature value may be a value smaller than the third reference temperature value.
- the fourth reference temperature value may be 35 degrees, but is not limited thereto.
- the controller ( 40 may return to step S51 without performing the defrosting operation.
- the updated logic temperature ⁇ Ht when the updated logic temperature ⁇ Ht is less than the third reference temperature value and equal to or greater than the fourth reference temperature value, it means a state in which air flow path blockage does not occur.
- step S60 and S61 the control unit 40 determines that the updated logic temperature ⁇ Ht exceeds the fourth reference temperature value for the first time. Determine whether or not. If the updated logic temperature ⁇ Ht exceeds the fourth reference temperature value for the first time, in step S62, the controller 40 determines whether the updated logic temperature ⁇ Ht is less than the first reference temperature value. .
- step S54 the controller 40 determines that the amount of implantation is large in the evaporator 30, and performs defrosting operation.
- the controller 40 determines that the air flow path blockage has not occurred, and may return to step S51 without performing the defrosting operation.
- step S63 the controller 40 determines that the updated logic temperature? Ht It is determined whether A is increased by more than the previously updated logic temperature.
- the reason for determining whether the updated logic temperature ⁇ Ht is increased by more than A by the previously updated logic temperature is to determine whether the air flow path blockage is in progress. In other words, even if the air flow path is not blocked, the growth of frost in the air flow path is fundamentally blocked.
- the updated logic temperature ⁇ Ht becomes significantly higher than the previously updated logic temperature
- clogging of the air passage proceeds, and the amount of cooling of the air flowing through the bypass passage 230 is significantly smaller. It can mean losing. That is, if the air flow path is continuously blocked, there is a problem that the air flow path is completely blocked and the air is not circulated.
- step S54 when it is determined that the updated logic temperature ⁇ Ht is increased by more than A by a previously updated logic temperature, in step S54, the controller 40 performs a defrost operation to indicate that the air flow path is blocked. prevent.
- step S62 If it is determined that the updated logic temperature ⁇ Ht is not increased by more than A by the previously updated logic temperature, the controller 40 proceeds to step S62.
- the first sensing temperature Ht1 is a temperature detected by the sensing element of the sensor immediately after the heating element is turned on, and the second sensing temperature Ht2 is immediately after the heating element is turned off.
- the temperature detected by the sensing element of the sensor has been described, but is not limited thereto.
- the first sensing temperature Ht1 and the second sensing temperature Ht2 may be temperature values detected in the state where the heating element is turned on.
- the first sensing temperature Ht1 may be the lowest temperature value during the time when the heating element is turned on
- the second sensing temperature Ht2 may be the highest temperature value during the time when the heating element is turned on.
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Abstract
Description
Claims (20)
- 공기가 열교환 공간에 배치된 증발기를 바이패스하여 유동하도록 하는 바이패스 유로에 설치된 센서의 발열 소자가 일정 시간 동안 작동하는 단계;상기 발열 소자가 온 또는 오프된 상태에서 상기 발열 소자의 온도를 감지하는 단계; 및상기 발열 소자의 감지 온도들 중, 최저값인 제1감지온도(Ht1)와, 최고값인 제2감지온도(Ht2)의 온도 차이값에 기초하여, 상기 열교환 공간 내에서 공기의 유로 막힘을 감지하는 단계를 포함하는 냉장고의 제어방법.
- 제 1 항에 있어서,상기 제1감지온도(Ht1)는, 상기 발열 소자가 온된 직후, 상기 센서의 감지소자에서 감지되는 온도인 것을 특징으로 하는 냉장고의 제어방법.
- 제 1 항에 있어서,상기 제2감지온도(Ht2)는, 상기 발열 소자가 오프된 직후, 상기 센서의 감지 소자에서 감지되는 온도인 것을 특징으로 하는 냉장고의 제어방법.
- 제 1 항에 있어서,상기 제1감지온도(Ht1)는, 상기 발열 소자가 온된 시간 동안의 최저 온도값인 것을 특징으로 하는 냉장고의 제어방법.
- 제 1 항에 있어서,상기 제2감지온도(Ht2)는, 상기 발열 소자가 온된 시간 동안의 최고 온도값인 것을 특징으로 하는 냉장고의 제어방법.
- 제 1 항에 있어서,상기 제1감지온도(Ht1)와 제2감지온도(Ht2)의 온도 차이값이 제1기준값 미만인 경우, 상기 증발기의 제상 운전을 수행하는 단계를 더 포함하는 냉장고의 제어방법.
- 제 6 항에 있어서,상기 제상 운전이 완료된 이후, 상기 제1감지온도(Ht1)와 제2감지온도(Ht2)의 온도 차이값을 갱신하는 단계를 더 포함하고,상기 갱신된 온도 차이값이 제1기준값보다 큰 제2기준값을 초과할 경우, 상기 센서의 고장을 표시하는 것을 특징으로 하는 냉장고의 제어방법.
- 제 7 항에 있어서,상기 갱신된 온도 차이값이 제2기준값 미만일 경우, 상기 갱신된 온도 차이값이 제2기준값보다 작은 제3기준값 미만인지 여부를 판단하고,상기 갱신된 온도 차이값이 제3기준값을 초과할 경우, 상기 열교환 공간 내에서의 유로 막힘을 표시하는 것을 특징으로 하는 냉장고의 제어방법.
- 제 8 항에 있어서,상기 유로 막힘 표시는, 상기 열교환 공간을 형성하는 냉기 덕트의 냉기 유입홀 또는 냉기 토출홀의 막힘, 상기 냉기 덕트에 구비된 송풍팬의 막힘, 또는 상기 바이패스 유로의 막힘 중 적어도 하나 이상을 표시하는 것을 냉장고의 제어방법.
- 제 8 항에 있어서,상기 갱신된 온도 차이값이 제3기준값 미만일 경우, 상기 갱신된 온도 차이값이 제3기준값보다 작은 제4기준값 미만인지 여부를 판단하고,상기 갱신된 온도 차이값이 제4기준값 미만일 경우, 상기 증발기의 제상 운전을 다시 수행하는 것을 특징으로 하는 냉장고의 제어방법.
- 제 10 항에 있어서,상기 갱신된 온도 차이값이 제4기준값 미만일 경우, 상기 갱신된 온도 차이값이 갱신되기 이전의 온도 차이값에 비하여 일정값 이상 증가하였는지 여부를 판단하고,상기 갱신된 온도 차이값이 갱신되기 이전의 온도 차이값에 비하여 일정값 이상 증가한 경우, 상기 증발기의 제상 운전을 다시 수행하는 것을 특징으로 하는 냉장고의 제어방법.
- 제 10 항에 있어서,상기 갱신된 온도 차이값이 갱신되기 이전의 온도 차이값에 비하여 일정값 이상 증가하지 않은 경우, 상기 갱신된 온도 차이값이 제1기준값 미만인지 여부에 따라 상기 증발기의 제상 운전을 다시 수행하는 것을 특징으로 하는 냉장고의 제어방법.
- 저장실을 형성하는 인너 케이스;상기 저장실 내에서 공기의 유동을 안내하며 상기 인너 케이스와 함께 열교환 공간을 형성하는 냉기 덕트;상기 열교환 공간에 배치되는 증발기;공기가 상기 증발기를 바이패스하여 유동하도록 하는 바이패스 유로;상기 바이패스 유로에 배치되는 발열 소자와, 상기 발열 소자의 온도를 감지하는 감지 소자를 포함하는 센서; 및상기 발열 소자의 감지 온도들 중, 최저값인 제1감지온도(Ht1)와, 최고값인 제2감지온도(Ht2)의 온도 차이값에 기초하여, 상기 열교환 공간 내에서 공기의 유로 막힘을 감지하는 제어부를 포함하는 냉장고.
- 제 13 항에 있어서,상기 제1감지온도(Ht1)는, 상기 발열 소자가 온된 직후, 상기 감지소자에서 감지되는 온도이고,상기 제2감지온도(Ht2)는, 상기 발열 소자가 오프된 직후, 상기 감지 소자에서 감지되는 온도인 것을 특징으로 하는 냉장고.
- 제 13 항에 있어서,상기 제1감지온도(Ht1)는, 상기 발열 소자가 온된 시간 동안의 최저 온도값이고,상기 제2감지온도(Ht2)는, 상기 발열 소자가 온된 시간 동안의 최고 온도값인 것을 특징으로 하는 냉장고.
- 제 13 항에 있어서,상기 제어부는, 상기 제1감지온도(Ht1)와 제2감지온도(Ht2)의 온도 차이값이 제1기준값 미만인 경우, 상기 증발기의 제상 운전을 수행하는 냉장고.
- 제 16 항에 있어서,상기 제어부는, 상기 제상 운전이 완료된 이후, 상기 제1감지온도(Ht1)와 제2감지온도(Ht2)의 온도 차이값을 갱신하고,상기 갱신된 온도 차이값이 제1기준값보다 큰 제2기준값을 초과할 경우, 상기 센서의 고장을 표시하는 것을 특징으로 하는 냉장고.
- 제 17 항에 있어서,상기 제어부는, 상기 갱신된 온도 차이값이 제2기준값 미만일 경우, 상기 갱신된 온도 차이값이 제2기준값보다 작은 제3기준값 미만인지 여부를 판단하고,상기 갱신된 온도 차이값이 제3기준값을 초과할 경우, 상기 열교환 공간 내에서의 유로 막힘을 표시하는 것을 특징으로 하는 냉장고.
- 제 18 항에 있어서,상기 유로 막힘 표시는, 상기 열교환 공간을 형성하는 냉기 덕트의 냉기 유입홀 또는 냉기 토출홀의 막힘, 상기 냉기 덕트에 구비된 송풍팬의 막힘, 또는 상기 바이패스 유로의 막힘 중 적어도 하나 이상을 표시하는 것을 포함하는 냉장고.
- 제 18 항에 있어서,상기 제어부는, 상기 갱신된 온도 차이값이 제3기준값 미만일 경우, 상기 갱신된 온도 차이값이 제3기준값보다 작은 제3기준값 미만인지 여부를 판단하고,상기 갱신된 온도 차이값이 제4기준값 미만일 경우, 상기 증발기의 제상 운전을 다시 수행하는 것을 특징으로 하는 냉장고.
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AU2019243005A AU2019243005B2 (en) | 2018-03-26 | 2019-03-19 | Refrigerator and method for controlling same |
EP19774782.7A EP3779333A4 (en) | 2018-03-26 | 2019-03-19 | Refrigerator and method for controlling same |
CN201980019360.7A CN111868462B (zh) | 2018-03-26 | 2019-03-19 | 冰箱及其控制方法 |
CN202210309715.XA CN114704993B (zh) | 2018-03-26 | 2019-03-19 | 冰箱的控制方法 |
US17/030,888 US20210010738A1 (en) | 2018-03-26 | 2020-09-24 | Refrigerator and method for controlling same |
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KR102536378B1 (ko) * | 2018-03-26 | 2023-05-25 | 엘지전자 주식회사 | 냉장고 및 그 제어방법 |
KR102630194B1 (ko) | 2019-01-10 | 2024-01-29 | 엘지전자 주식회사 | 냉장고 |
KR102665398B1 (ko) * | 2019-01-10 | 2024-05-13 | 엘지전자 주식회사 | 냉장고 |
US20230288123A1 (en) | 2020-08-06 | 2023-09-14 | Lg Electronics Inc. | Refrigerator |
KR20220018178A (ko) | 2020-08-06 | 2022-02-15 | 엘지전자 주식회사 | 냉장고 및 그의 운전 제어방법 |
KR20220018179A (ko) | 2020-08-06 | 2022-02-15 | 엘지전자 주식회사 | 냉장고 |
KR20220018177A (ko) | 2020-08-06 | 2022-02-15 | 엘지전자 주식회사 | 냉장고 |
KR20220018180A (ko) | 2020-08-06 | 2022-02-15 | 엘지전자 주식회사 | 냉장고 |
KR20220018175A (ko) | 2020-08-06 | 2022-02-15 | 엘지전자 주식회사 | 냉장고 |
KR20220018181A (ko) | 2020-08-06 | 2022-02-15 | 엘지전자 주식회사 | 냉장고 |
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2019
- 2019-03-19 EP EP19774782.7A patent/EP3779333A4/en active Pending
- 2019-03-19 AU AU2019243005A patent/AU2019243005B2/en active Active
- 2019-03-19 CN CN201980019360.7A patent/CN111868462B/zh active Active
- 2019-03-19 CN CN202210309715.XA patent/CN114704993B/zh active Active
- 2019-03-19 WO PCT/KR2019/003206 patent/WO2019190114A1/ko unknown
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2020
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Also Published As
Publication number | Publication date |
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KR20190112482A (ko) | 2019-10-07 |
EP3779333A4 (en) | 2021-12-29 |
CN114704993A (zh) | 2022-07-05 |
CN111868462B (zh) | 2022-04-15 |
AU2019243005A1 (en) | 2020-10-15 |
AU2019243005B2 (en) | 2022-07-14 |
CN111868462A (zh) | 2020-10-30 |
CN114704993B (zh) | 2024-04-02 |
KR102536378B1 (ko) | 2023-05-25 |
US20210010738A1 (en) | 2021-01-14 |
EP3779333A1 (en) | 2021-02-17 |
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