WO2000075586A1 - Refrigerator operating in economy mode - Google Patents

Refrigerator operating in economy mode Download PDF

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Publication number
WO2000075586A1
WO2000075586A1 PCT/TR2000/000035 TR0000035W WO0075586A1 WO 2000075586 A1 WO2000075586 A1 WO 2000075586A1 TR 0000035 W TR0000035 W TR 0000035W WO 0075586 A1 WO0075586 A1 WO 0075586A1
Authority
WO
WIPO (PCT)
Prior art keywords
temperature
freezer
fresh food
unit
compressor
Prior art date
Application number
PCT/TR2000/000035
Other languages
French (fr)
Inventor
Emre Arisoy
Original Assignee
Arçelik A.Ş.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Arçelik A.Ş. filed Critical Arçelik A.Ş.
Priority to AU58648/00A priority Critical patent/AU5864800A/en
Priority to TR2001/03799T priority patent/TR200103799T2/en
Publication of WO2000075586A1 publication Critical patent/WO2000075586A1/en

Links

Classifications

    • 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
    • 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
    • F25B2600/00—Control issues
    • F25B2600/02—Compressor control
    • F25B2600/025—Compressor control by controlling speed
    • F25B2600/0251—Compressor control by controlling speed with on-off operation
    • 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
    • F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
    • F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
    • 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
    • F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
    • F25D2400/30—Quick freezing
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/02—Sensors detecting door opening
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature
    • 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
    • F25D2700/00—Means for sensing or measuring; Sensors therefor
    • F25D2700/12—Sensors measuring the inside temperature
    • F25D2700/122—Sensors measuring the inside temperature of freezer compartments

Definitions

  • Figure 5 is the graphical representation of the temperature distribution in the fresh food compartment.
  • T open2 value is the highest compartment temperature value determined by the manufacturer, in the power-saving mode.
  • Step 8 the control unit (1) controls whether the freezer door is open or not; whereas in Step 9 it controls whether the function key is pressed or not.
  • motorized damper is opened by the driving unit (3) at step 12 according to the values selected by the user in Step 14 and the normal cooling cycle set by the user for the freezer compartment, is performed by driving (running) the fan motor. If the door is not opened and the function key is not pressed for a time period (period 2) as defined by the formula (t> period 2), the control unit (1) realizes the power saving in Step 11.
  • Step 12 the values selected by the user in Step 14 are replaced by the values recorded to the memory in Step 11 according to which the motor clapet valve is opened and the fan motor is driven by the driving unit (3).

Abstract

In a two-door type refrigerator with freezer and fresh food compartments, when any one of the doors is not opened for a certain time period or in case the set values are not modified by the user, the cooling cycle continues according to a warmer value than the one set by the user. This value is not higher than the storage temperature that is critical for the food. Compartment temperatures are automatically controlled according to the noraml cooling cycle or power-saving cycle modes of operation.

Description

REFRIGERATOR OPERATING IN ECONOMY MODE
The present invention is related to an operation control system of a refrigerator, and particularly to the control of the refrigerator during the time periods when it is not actively used.
The commercial or domestic type cooling systems have two compartments maintained at different temperatures; namely the freezer compartment in which frozen food is stored is at a lower temperature than the fresh food compartment where fresh food is stored. The refrigerators, in general, have been operated according to the functions set by the user, which are independent of the frequency of the door usage. Thus, the refrigerators perform the cooling cycle as required during the usage period, when they are used in high frequencies. Furthermore, the same refrigerators continue their normal operation even at lower usage frequencies or when they are not used. The normal operation of the fan motor and the compressor during low-frequency or non-usage periods, causes a great amount of energy consumption and noise.
In the state of art, the operation of the refrigerator in an economy mode is provided by determining the amount of light in the environment by means of a photocell, assuming that the door usage (opening) frequency is lower during the night.
The object of the invention is to reduce the power consumption and noise, originated from the running of the fan motor and the compressor, by passing to the power-saving mode during non-usage periods.
An embodiment of the refrigerator operating in economy mode, which is realized in order to attain the said object of the invention is illustrated in the attached drawings, wherein: Figure 1, is a schematic block diagram of the thermostatic control circuits;
Figure 2, is a flow chart showing the cooling cycle control sequence of the freezer compartment in the refrigerator;
Figure 3, is a flow chart showing the cooling cycle control sequence of the fresh food comportment in the refrigerator;
Figure 4, is the graphical representation of the temperature distribution in the freezer compartment;
Figure 5, is the graphical representation of the temperature distribution in the fresh food compartment.
The components shown in the drawings have been enumerated individually, as follows:
1. Control unit
2. DC power supply unit 3. Driving unit
4. Display unit
5. Input unit
6. Function selecting unit
7. Temperature sensing unit
In a two-door type refrigerator with freezer and fresh food compartments, when any one of the doors is not opened for a certain time period or in case the set values are not modified by the user, the cooling cycle continues according to a warmer value than the one set by the user. This value is not higher than the storage temperature that is critical for the food. By this implementation, the energy consumption is considerably reduced. The control unit (1) consists of electronic memory elements, a micro processor and an A/D converter for the processing of the input data. The control unit (1) controls the refrigerator according to a programme that has previously been loaded to the memory.
The DC power supply unit (2) converts a source voltage from the AC power source to a DC voltage level as required by various units in the refrigerator.
The display unit (4) displays the actual temperature value in the freezer and fresh food compartments.
The function selecting unit (6) provides the selection of specific functions (e.g. quick-freeze, holiday, etc) and sets the user temperature in the freezer and fresh food compartments. When the user sets the temperature value from the function- selecting unit (6), the said values are sent to the control unit (1).
The temperature sensing unit (7) consists of the temperature sensors that detect the temperature in the freezer and fresh food compartments.
The driving unit (3) controls the compressor, fan motor, motorized damper , and the defrost heater in line with the signals sent from the control unit (1).
The input unit (5) is a freezer-and/or fresh food-door open/close sensor. In case one of the said doors are open, this unit (5) sends a signal to the micro processor, and another signal is sent by the said unit (5) when the said door is closed. The duration of the door-closed state, for each door, is determined by the microprocessor from the said signals and these duration periods are recorded in the memory of the control unit (1) to be evaluated. The control unit (1) uses the control signal reporting the door-closed state duration and whether a function key in the function selecting unit (6) is pressed or not, as well as the freezer and fresh food compartments temperature data selected by the user and displayed in the display unit (4), as input data.
Topeni value, is the highest compartment temperature value determined by the user, during normal operation of the refrigerator.
Tciosei value, is the lowest compartment temperature value determined by the user, during normal operation of the refrigerator.
Topen2 value, is the highest compartment temperature value determined by the manufacturer, in the power-saving mode.
Tciose2 value, is the lowest compartment temperature value determined by the user, in the power -saving mode.
Period 1 , is the time period for the freezer compartment to convert to the economy mode.
Period 2, is the time period for the fresh food compartment to convert to the economy mode.
The time tl is the time period when the compressor and fan motor are active, in normal cooling cycle.
The time t3 is the time period when the compressor and fan motor are closed in normal cooling cycle.
The time t4 is the time period when the compressor and fan motor are closed in power-saving mode. The time t5 is the time period when motorized damper and fan motor are active in normal cooling cycle.
The time t6 is the time period when motorized damper and fan motor are closed in normal cooling cycle.
The time t7 is the time period when motorized damper and fan motor are active in power-saving mode.
The time t8 is the time period when motorized damper and fan motor are closed in power-saving mode.
The time t9 is the time period when the refrigerator is operated in economy mode.
The control unit (1) receives the temperature data concerning the freezer and fresh food compartments that are sensed by the temperature sensing unit (7). The control unit (1) compares the data received from the temperature sensing unit and those obtained from the input unit (5). The average temperature values for the freezer and fresh food compartments are calculated and each of them is processed in the display unit (4) as outputs and these processed data are sent to the driving unit (3) and to the compressor, fan motor, motorized damper and defrost heater, chosen by the function selecting unit (6), in order to operate them. The compartment temperatures are automatically controlled depending on the normal cooling cycle or power-saving cycle modes.
The temperature control of the freezer compartment made by the control unit (1) is shown in the flow chart (Fig. 2).
In the first step, the control unit (1) controls whether the freezer door is open or not, and in Step 2 it controls whether the function key is pressed or not. In step 6 if the door is open or if the function key is pressed, the counter is reset (t=0) the control unit (1) carries out its normal operation. In Step 5, the compressor and fan motor are driven by the driving unit (3) and a normal cooling cycle is performed for the freezer compartment according to the values set by the user in Step 7. If the door is not opened and the function key is not pressed for a time period (period 1) as defined by the formula: (t≥period 1), the control unit (1) is realizing power-saving according to the values mentioned in Step 4. In Step 5, the compressor and the fan motor are driven by the driving unit (3) according to the values recorded in the memory in Step 4, instead of the values defined in Step 7 and set by the user.
The control of the freezer compartment temperature made by the control unit (1) is illustrated in the flow chart in Fig.3.
In Step 8, the control unit (1) controls whether the freezer door is open or not; whereas in Step 9 it controls whether the function key is pressed or not. In Step 13, the counter is reset (t=0) and the control unit carries out its normal operation, if the door is open or if the function key is pressed. In case one of the events mentioned in Step 8 or Step 9 occurs, motorized damper is opened by the driving unit (3) at step 12 according to the values selected by the user in Step 14 and the normal cooling cycle set by the user for the freezer compartment, is performed by driving (running) the fan motor. If the door is not opened and the function key is not pressed for a time period (period 2) as defined by the formula (t> period 2), the control unit (1) realizes the power saving in Step 11. In Step 12, the values selected by the user in Step 14 are replaced by the values recorded to the memory in Step 11 according to which the motor clapet valve is opened and the fan motor is driven by the driving unit (3).
The power-saving mode can operate in both compartments independently from each other. The compressor and the fan maintain the temperature in the freezer compartment in the range between Topeni and TC|0Sei values during the normal cooling cycle. When the temperature in the freezer compartment exceeds the T0peni value as detected by the freezer compartment temperature sensing unit (7), the compressor and the fan are operated by the driven unit (3). If the said temperature measured by the temperature sensing unit (7) is below the Tclose] value, the compressor and the fan are stopped by the driving unit (3).
The compressor run time percentage of the refrigerator in normal cooling cycle is calculated as below:
PRT (NC)= 100* tl/(tl+t2)
In case the freezer door is not opened and any one of the function key is not pressed, the normal cooling cycle is switched to the power- saving mode at the end of a time period (period 1), and the freezer compartment temperature is maintained between the warmer values, (Topen2 and Tcι0Se2) until a function key is pressed or its door is opened, by driving the compressor and the fan. When the freezer compartment temperature measured by the temperature sensing unit (7), exceeds the value Topen2, the compressor and the fan are driven by the driving unit (3). Otherwise, i.e. if the freezer compartment temperature is measured by the temperature sensing unit (7) as below the value Tcιose2, they are stopped by the driving unit (3).
The compressor run time percentage of the refrigerator in power-saving mode, is calculated as below:
PRT (PS)=100*t3/(t3+t4) The compressor run time percentage of the refrigerator in normal cooling mode is greater than that in its power-saving mode.
PRT(NC) > PRT(PS)
As the operational rates of the compressor and the fan are reduced in the freezer compartment switched to the power saving mode, energy is saved.

Claims

A refrigerator comprising a DC power supply unit (2) that converts a source voltage from the AC power source to a DC voltage level as required by various units in the refrigerator ; a display unit (4) that displays the actual temperature value in a compartment selected from the freezer and fresh food compartments; a function selecting unit (6) that provides the selection of specific functions (e.g. quick-freeze, holiday, etc) and sets the user temperature in the freezer and fresh food compartments; a temperature sensing unit (7) which consists of the temperature sensors that detect the temperature in the freezer and fresh food compartments ; a driving unit (3) that controls the compressor, fan motor, motorized damper , and the defrost heater ; and an input unit (5) that controls opening/closing of the freezer-and fresh food-doors characterized in that, if the door is opened or if a function key is pressed it provides the operation of the compressor and the fan motor by the driving unit (3) when the freezer compartment temperature measured by the temperature sensing unit (7) exceeds the value Topen!, whereas if the freezer compartment temperature measured by the temperature sensing unit
(7) is below the value Tcι0Sei, the driving unit (3) stops the compressor and fan in order to maintain the freezer compartment temperature between the values Topenι and Tcι0Sei> thus providing a normal cooling cycle for the freezer compartment; that if the freezer door is not opened and the function key is not pressed for a time period (period 1) as defined by the inequality :
(t≥period 1), it provides the operation of the compressor and the fan motor by the driving unit (3) according to the values recorded in the memory when the freezer compartment temperature measured by the temperature sensing unit (7) exceeds the value Topen2, whereas if the freezer compartment temperature measured by the temperature sensing unit (7) is below the value Tcι0Se2) operation of the compressor and fan motor are stopped by the driving unit (3) and, at the end of the normal cooling cycle time period (period 1), the cooling process is realized in the power-saving mode until a function key between the above normal temperature values Topen2 and Tcιose2 is pressed or until the door is opened.
2. A refrigerator comprising a DC power supply unit (2) that converts a source voltage from the AC power source to a DC voltage level as required by various units in the refrigerator ; a display unit (4) that displays the actual temperature value in a compartment selected from the freezer and fresh food compartments; a function selecting unit (6) that provides the selection of specific functions (e.g. quick-freeze, holiday, etc) and sets the user temperature in the freezer and fresh food compartments; a temperature sensing unit (7) which consists of the temperature sensors that detect the temperature in the freezer and fresh food compartments ; a driving unit (3) that controls the compressor, fan motor, motorized damper , and the defrost heater ; and an input unit (5) that controls opening/closing of the freezer-and fresh food-doors characterized in that, if the door is opened or if a function key is pressed it provides the operation of the compressor and the fan motor by the driving unit (3) when the fresh food compartment temperature measured by the temperature sensing unit (7) exceeds the value Topeni, whereas if the fresh food compartment temperature measured by the temperature sensing unit (7) is below the value Tcιoseι, the driving unit (3) stops the compressor and fan in order to maintain the fresh food compartment temperature between the values Topeni and Tcι0sei, thus providing a normal cooling cycle for the fresh food compartment; that if the fresh food door is not opened and the function key is not pressed for a time period (period 2) as defined by the inequality (t≥period 2) it provides, operation of the compressor and the fan motor by the driving unit (3) according to the values recorded in the memory when the fresh food compartment temperature measured by the temperature sensing unit (7) exceeds the value Topeτa, whereas if the fresh food compartment temperature measured by the temperature sensing unit (7) below the value Tcι0se2 , operation of the compressor and the fan motor are stopped by the driving unit (3) and, at the end of the normal cooling cycle time period (period 2) the cooling process is realized in the power- saving mode until a function key between the above normal temperature values Topen2 and Tcιose2 is pressed or until the door is opened.
3. A refrigerator according to the Claims 1 to 2, characterized in that the power- saving mode can operate in the freezer and fresh food compartments, independently from each other.
PCT/TR2000/000035 1999-06-04 2000-06-05 Refrigerator operating in economy mode WO2000075586A1 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
AU58648/00A AU5864800A (en) 1999-06-04 2000-06-05 Refrigerator operating in economy mode
TR2001/03799T TR200103799T2 (en) 1999-06-04 2000-06-05 Refrigerator working in economical mode.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
TR1999/01263 1999-06-04
TR9901263 1999-06-04

Publications (1)

Publication Number Publication Date
WO2000075586A1 true WO2000075586A1 (en) 2000-12-14

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PCT/TR2000/000035 WO2000075586A1 (en) 1999-06-04 2000-06-05 Refrigerator operating in economy mode

Country Status (3)

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AU (1) AU5864800A (en)
TR (1) TR200103799T2 (en)
WO (1) WO2000075586A1 (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2005106364A1 (en) * 2004-05-04 2005-11-10 Whirlpool S.A. Temperature control system in a refrigeration appliance
US7200467B2 (en) 2002-11-08 2007-04-03 Usa Technologies, Inc. Method and apparatus for power management control of a cooling system in a consumer accessible appliance
FR2967267A1 (en) * 2010-11-05 2012-05-11 Tournus Equipement Method for controlling operation of e.g. heat energy production unit, to maintain enclosure at controlled temperature, involves regulating operation of unit independent from temperature measured by sensor at time of service phase
WO2013030065A3 (en) * 2011-09-01 2013-06-20 BSH Bosch und Siemens Hausgeräte GmbH Refrigeration device for low-noise operation
JP2014040947A (en) * 2012-08-21 2014-03-06 Toshiba Corp Refrigerator
EP2520879B1 (en) * 2009-12-28 2018-12-05 PHC Holdings Corporation Low-temperature storage
CN111076491A (en) * 2018-10-22 2020-04-28 青岛海尔股份有限公司 Refrigerator and control method thereof

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JPH04273981A (en) * 1991-02-27 1992-09-30 Sharp Corp Freezer-refrigerator device
US5228300A (en) * 1991-06-07 1993-07-20 Samsung Electronics Co., Ltd. Automatic operation control method of a refrigerator
US5263332A (en) * 1991-04-03 1993-11-23 Goldstar, Co., Ltd. Temperature control method for refrigerator
US5678416A (en) * 1994-11-17 1997-10-21 Samsung Electronics Co., Ltd. Methods and apparatus for controlling a refrigerator in normal and overload modes
EP0881443A1 (en) * 1997-05-27 1998-12-02 Urs Künzle Power saving circuit for mains operated refrigeration apparatus and control method thereof
US5931004A (en) * 1994-11-11 1999-08-03 Samsung Electronics Co., Ltd. Refrigerator and control method therefor

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH04273981A (en) * 1991-02-27 1992-09-30 Sharp Corp Freezer-refrigerator device
US5263332A (en) * 1991-04-03 1993-11-23 Goldstar, Co., Ltd. Temperature control method for refrigerator
US5228300A (en) * 1991-06-07 1993-07-20 Samsung Electronics Co., Ltd. Automatic operation control method of a refrigerator
US5931004A (en) * 1994-11-11 1999-08-03 Samsung Electronics Co., Ltd. Refrigerator and control method therefor
US5678416A (en) * 1994-11-17 1997-10-21 Samsung Electronics Co., Ltd. Methods and apparatus for controlling a refrigerator in normal and overload modes
EP0881443A1 (en) * 1997-05-27 1998-12-02 Urs Künzle Power saving circuit for mains operated refrigeration apparatus and control method thereof

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7200467B2 (en) 2002-11-08 2007-04-03 Usa Technologies, Inc. Method and apparatus for power management control of a cooling system in a consumer accessible appliance
WO2005106364A1 (en) * 2004-05-04 2005-11-10 Whirlpool S.A. Temperature control system in a refrigeration appliance
WO2007046866A1 (en) * 2005-10-20 2007-04-26 Usa Technologies, Inc. Method and apparatus for power management control of the cooling system of a refrigerating appliance
EP2520879B1 (en) * 2009-12-28 2018-12-05 PHC Holdings Corporation Low-temperature storage
FR2967267A1 (en) * 2010-11-05 2012-05-11 Tournus Equipement Method for controlling operation of e.g. heat energy production unit, to maintain enclosure at controlled temperature, involves regulating operation of unit independent from temperature measured by sensor at time of service phase
WO2013030065A3 (en) * 2011-09-01 2013-06-20 BSH Bosch und Siemens Hausgeräte GmbH Refrigeration device for low-noise operation
CN103842752A (en) * 2011-09-01 2014-06-04 Bsh博世和西门子家用电器有限公司 Refrigeration device for low-noise operation
CN103842752B (en) * 2011-09-01 2015-12-23 Bsh家用电器有限公司 For the refrigerating appliance that low noise runs
JP2014040947A (en) * 2012-08-21 2014-03-06 Toshiba Corp Refrigerator
CN111076491A (en) * 2018-10-22 2020-04-28 青岛海尔股份有限公司 Refrigerator and control method thereof
CN111076491B (en) * 2018-10-22 2020-10-30 海尔智家股份有限公司 Refrigerator and control method thereof

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