KR20100034080A - Refrigerator and method for controlling the same - Google Patents

Abstract

PURPOSE: A refrigerator and a control method thereof are provided to keep uniform temperature distribution of storage compartments by changing the opening duration of a valve according to the opening degree of the valve. CONSTITUTION: A refrigerator comprises a plurality of storage compartments, a plurality of evaporators(81,82), a valve, a controller, and an exterior air temperature sensor. The evaporators are installed in the respective storage compartment to cool the storage compartment. The controller adjusts the amount of refrigerant provided to the evaporators and the degree and duration of opening the valve based on the comparison between target temperatures of the storage compartments. The exterior air temperature sensor senses the external temperature of the storage compartment.

Description

Refrigerator and its control method {Refrigerator and method for controlling the same}

The present invention relates to a refrigerator and a control method thereof, and more particularly, to a refrigerator and a control method for independently cooling a plurality of storage compartments by controlling a valve to change a flow of a refrigerant.

In general, the refrigerator is applied to a conventional refrigeration cycle in which the refrigerant is circulated therein so as to absorb the ambient heat when the refrigerant in the liquid state evaporates to supply the cold air generated to the food storage room, such as the freezer and the refrigerating compartment to provide a variety of food In order to keep the fresh for a long time, the kimchi refrigerator for aging and storing kimchi, which is fermented food, has been widely used in recent years by using such a cooling system and an electric heater.

In addition, a separate storage room that requires differentiated storage functions such as fish, vegetables, and kimchi is being applied to the refrigerator according to various lifestyles and preference foods of the user.

The multiple storage rooms of such refrigerators are set to different target temperatures according to the food being stored, but when the target temperature difference between two adjacent storage rooms is large, each storage room is kept at the target temperature. Due to the influence of the seal, it is difficult to maintain the temperature in the reservoir at the set target temperature.

According to an aspect of the invention a plurality of storage compartments; A plurality of evaporators respectively provided in the plurality of storage chambers to cool the storage chambers; A valve for controlling the amount of refrigerant supplied to the plurality of evaporators; And a control unit for comparing the target temperatures of the plurality of storage chambers and controlling the opening amount and opening holding time of the valve according to the comparison result.

And an outside air temperature sensing unit for sensing a temperature outside the storage compartment, and the control unit adjusts the opening and holding time of the valve based on the outside air temperature.

The control unit is set in advance the evaporator to which the refrigerant is supplied in accordance with the opening amount of the valve, the amount of refrigerant supplied to the evaporator by setting the opening degree holding time of the valve corresponding to the opening amount of the valve when the target temperatures of the plurality of storage chambers are different from each other Adjust.

As the difference between the target temperatures of the plurality of storage compartments is increased, the controller controls the opening opening time of the valve corresponding to the evaporator of the storage compartment having a relatively high target temperature among the plurality of storage compartments.

According to another aspect of the present invention, a control method of a refrigerator having a plurality of evaporators respectively provided in a plurality of storage compartments and a valve for controlling the amount of refrigerant supplied to the plurality of evaporators, the target temperature of the plurality of storage compartments are compared and compared According to the result, the opening amount and opening holding time of the valve are controlled.

Controlling the opening amount holding time of the valve further includes sensing the outside temperature of the plurality of storage rooms and adjusting the opening degree holding time of the valve based on the outside temperature.

Adjusting the opening amount holding time of the valve further includes adjusting the opening degree holding time of the valve as the outside air temperature increases, and increasing the amount of refrigerant supplied to the evaporator of the storage chamber having a relatively high target temperature among the plurality of storage chambers.

Controlling the opening amount holding time of the valve includes controlling the opening degree holding time of the valve corresponding to the opening amount of the valve as the difference between the target temperatures of the plurality of storage chambers increases.

Controlling the opening opening time of the valve for long includes increasing the amount of refrigerant supplied to the evaporator of the storage chamber having a relatively high target temperature among the plurality of storage chambers.

According to an aspect of the present invention, when the target temperatures of the adjacent storage chambers are different from each other, the temperature distribution of the storage chamber having a relatively high target temperature can be uniformed by changing and controlling the opening degree holding time of the valve according to the opening amount of the valve.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

1A is a cycle configuration diagram of a refrigerator according to an embodiment of the present invention, and a cycle configuration diagram of a refrigerator provided with two storage compartments, and FIG. 1B is a cycle configuration diagram of a refrigerator according to another embodiment of the present invention. It is a cycle block diagram of the refrigerator provided.

In the main body (not shown) of the refrigerator, a plurality of storage compartments (not shown) divided by partitions are formed. Two storage compartments may be provided, which are divided into a relatively high temperature refrigerator and a relatively low temperature freezer. In this case, the two storage compartments may be provided left or right by partition walls, or may be provided vertically. On the other hand, the storage compartment may be provided in three or more, these three storage compartments are divided into a freezer compartment, a refrigerating compartment and a variable temperature chamber. In this case, the three storage compartments may be provided up and down by the partition wall, or may be provided up and down by the partition wall, but the upper storage compartment may be provided separated by left and right by another partition wall. Based on this, a cycle configuration diagram of the refrigerator illustrated in FIGS. 1A and 1B will be described in more detail as follows.

As shown in FIG. 1A, a cycle configuration diagram of a refrigerator includes a compressor 10 compressing a refrigerant according to a predetermined cycle, and a refrigerant connected to an outlet of the compressor 10 and passing through the compressor 10 as a liquid refrigerant. Condenser 20 for condensation, the first and second capillaries 71 and 72 for depressurizing and expanding the refrigerant passing through the condenser 20, and the refrigerant passing through the first and second capillaries 71 and 72 are delivered to each storage compartment. Accumulator 90 provided between the first and second evaporators 81 and 82 to form cold air and between the first and second evaporators 81 and 82 and the compressor 10 to prevent liquid refrigerant from being supplied to the compressor 10. ). Here, the first and second capillary tubes 71 and 72 and the first and second evaporators 81 and 82 are respectively installed corresponding to the plurality of storage chambers, and the first evaporator 81 is provided to correspond to the first storage chambers and the second The second evaporator 82 is provided corresponding to the storage chamber. The evaporators 81 and 82 are provided with fans (not shown) for circulating cold air, respectively.

In addition, a valve 60 is installed between the condenser 20 and the first and second capillary tubes 71 and 72 to control the direction of the refrigerant passing through the condenser 20. At this time, it is preferable that the valve 60 uses a three-way valve. In addition, a dryer 50 is provided between the condenser 20 and the valve 60 to remove moisture contained in the refrigerant supplied from the condenser 20 to prevent water from entering the first and second capillary tubes 71 and 72. In addition, a cluster pipe 30 and a hot pipe 40 are further provided between the condenser 20 and the valve 60.

A part of the clister pipe 30 is disposed along both side walls and the upper surface of the main body, and the other part is disposed adjacent to the edge of the front surface of the main body, and the hot pipe 40 is disposed along the front side of the main body partition wall. That is, the cluster pipe 30 and the hot pipe 40 are one refrigerant pipes connected to each other and are arranged to circulate both side walls and the upper surface of the main body and then to the front surface again, and the cluster pipe 30 is formed inside the refrigerator. Dew is formed around the front edge by the temperature difference outside, and the hot pipe 40 supplies heat to the front of the main body to prevent the dew on the front of the main body due to the temperature difference between the inside and the outside of the storage compartment.

As shown in FIG. 1B, the cycle configuration diagram of the refrigerator according to another embodiment is compared to the cycle configuration diagram of the refrigerator according to the embodiment illustrated in FIG. 1A, except for the added evaporator 83 and the capillary tube 73. The remaining components are identical. Accordingly, the description of the same components will be omitted.

The cycle configuration diagram of the refrigerator illustrated in FIG. 1B further includes a capillary tube 73 and an evaporator 83 according to a change in the number of storage compartments. That is, the first, second and third capillary tubes 71, 72 and 73 and the first, second and third evaporators 81, 82 and 83 corresponding to the first, second and third storage chambers are provided and correspond to the first storage chamber. Thus, the first evaporator 81 is provided, the second evaporator 82 is provided corresponding to the second storage chamber, and the third evaporator 83 is provided corresponding to the third storage chamber. A valve 60 is installed between the condenser 20 and each capillary tube 71, 72, 73 to control the direction of the refrigerant passing through the condenser 20. At this time, it is preferable that the valve 60 uses a four-way valve.

2 is a control block diagram of a refrigerator according to an embodiment of the present invention, wherein the refrigerator includes a power supply unit 110, an input unit 120, a temperature sensing unit 130, a control unit 140, a display unit 150, and a compressor driving unit ( 160 and the valve driver 170.

The power supply unit 110 converts the power supplied from the outside into power suitable for driving to each component and supplies the power to each component.

The input unit 120 is for manipulating the operation of the refrigerator, and a target temperature of each storage room or each storage room operation mode is input by a user, and corresponds to a target temperature of each storage room or an operation mode of each storage room input by the user. The signal is transmitted to the controller 140.

The temperature sensing unit 130 includes a first temperature sensor 131, a second temperature sensor 132, and an outside air temperature sensor 133 provided outside the main body provided in each storage compartment.

The first temperature sensor 131 is provided in the first storage compartment of the refrigerator to sense the temperature of the first storage compartment and transmits the detected temperature of the detected first storage compartment to the controller 140, and the second temperature sensor 132 is the refrigerator It is provided in the second storage compartment of the sensing the temperature of the second storage compartment and transmits the detected temperature of the detected second storage compartment to the control unit 140, the outside temperature sensor 133 detects the temperature outside the main body and the detected outside air temperature The control unit 140 transmits.

In addition, when the three storage compartments are provided as shown in FIG. 140).

The controller 140 stores the target temperature of each storage compartment transmitted from the input unit 120, and drives the compressor 10 and the valve 60 based on the detected temperature of each storage compartment transmitted from the temperature sensing unit 130. Drive. That is, the controller 140 controls the driving of the compressor 10 and the opening amount of the valve 60 when the temperature inside the at least one storage room is equal to or higher than the preset temperature of the compressor 10 so that the storage room becomes the target temperature. At this time, when the temperature of the storage chamber becomes below the off-point temperature of the compressor 10, the stop of the compressor 10 and the opening amount of the valve 60 are controlled.

In addition, the controller 140 controls the compressor driver 160 to stop the compressor 10 when the outside temperature is a low temperature condition based on the outside temperature transmitted from the outside temperature sensor 133, and then operates the valve driver 170. By controlling the direction of the valve 60 to open to the storage compartment of the freezing mode to prevent overcooling of the storage compartment other than the freezing mode.

In addition, the controller 140 compares the sensing temperature of each storage compartment transmitted from the temperature sensing unit 130 with the target temperature, and then controls the compressor control signal of the compressor 10 and the opening control signal of the valve 60 according to the comparison result. The internal temperature of each storage compartment is maintained at the target temperature by transmitting to the driving unit 160 and the valve driving unit 170.

At this time, the control unit 140 compares or analyzes the target temperature of each storage chamber transmitted from the input unit 120 or compares and analyzes the target temperature corresponding to the operation mode of each storage chamber, and if the target temperatures of the adjacent storage chambers are different from each other, By controlling the time for maintaining the opening amount of (60), the temperature inside each storage compartment is evenly distributed while the internal temperature of each storage compartment is maintained at the target temperature. In addition, the controller 140 controls the opening degree holding time of the valve 60 when the target temperatures of the adjacent storage chambers are different from each other, but maintains the opening degree of the valve 60 based on the outside air temperature transmitted from the outside temperature sensor 133. Control the time.

In addition, the opening amount control of the valve 60 will be described with reference to FIGS. 1A, 1B, 3A, and 3B.

3A is an opening degree control graph of the three-way valve of the refrigerator according to an embodiment of the present invention, Figure 3B is an opening degree control graph of the four-way valve of the refrigerator according to another embodiment of the present invention.

As shown in FIG. 3A, when the opening amount of the valve 60 is controlled to 34 steps, both the 'B' and 'C' directions are closed, so that the first and second evaporators 81 and 82 are connected to the refrigerant. When the supply is cut off and the opening amount of the valve 60 is controlled to 100 steps, the 'B' direction is closed and the 'C' direction is opened, which causes the first evaporator 81 to cut off the supply of the refrigerant and The evaporator 82 is supplied with a refrigerant. When the opening amount of the valve 60 is controlled to 154 steps, both the 'B' and 'C' directions are opened, and thus, the first and second evaporators 81 and 82 are supplied with refrigerant, and the valve 60 In the case where the opening amount of the control panel is controlled to 195 steps, the 'B' direction is opened and the 'C' direction is closed, which causes the first evaporator 81 to supply the refrigerant and the second evaporator 82 to block the supply of the refrigerant. do.

As shown in FIG. 3B, when the opening amount of the valve 60 is controlled to 24 steps or 144 steps, the 'B' direction is opened, and the 'C' and 'D' directions are closed, which causes the first evaporator 81 to close. ) Is supplied with the refrigerant, and the second and third evaporators 82 and 83 are blocked from the supply of the refrigerant. When the opening amount of the valve 60 is controlled to 64 steps, the 'C' direction is opened, the 'B' and 'D' directions are closed, and thus the second evaporator 82 is supplied with a refrigerant and the first, 3 The evaporators 81 and 83 are cut off from the supply of refrigerant. In addition, when the opening amount of the valve 60 is controlled to 104 steps, the 'D' direction is opened, the 'B' and 'C' directions are closed, which causes the third evaporator 83 to supply the refrigerant and The evaporators 81 and 82 are cut off from the supply of refrigerant.

As such, the controller 40 controls the opening amount of the valve 60 to prevent the refrigerant from being supplied to the at least one evaporator or prevent the refrigerant from being supplied to the at least one evaporator.

The display unit 150 displays an operating state of the refrigerator. That is, the display unit 150 displays an operation mode of each storage compartment or an internal temperature of each storage compartment.

The compressor driving unit 60 drives the compressor 10 so that the internal temperature of each storage compartment is maintained at the target temperature according to the instruction of the control unit 40, and the valve driving unit 170 controls the valve 60 according to the instruction of the control unit 140. By controlling the opening amount of the) and the opening time of the valve 60, the refrigerant is supplied to the evaporator provided in the storage compartment.

4 is a control flowchart of a refrigerator according to one embodiment of the present invention, an embodiment of the present invention provides a control method of the refrigerator to uniformly distribute the internal temperature of the storage compartment. This will be described with reference to FIGS. 1A, 2, and 3A. That is, a refrigerator having two storage compartments (the first storage compartment on the left side and the second storage compartment on the right side) divided to the left and right will be described by way of example.

When the operation modes of the first and second storage rooms are set by the user, the target temperatures of the first and second storage rooms corresponding to the set operation modes are set 201.

Next, the internal temperatures of the first and second storage chambers are sensed by using the first and second temperature sensors 31 and 32 provided in the first and second storage chambers, and the detected temperatures of the first and second storage chambers are the hot spots of the compressor 10. Determine if the temperature is above. At this time, if the temperature of at least one storage compartment is equal to or higher than the hot point temperature of the compressor 10, the compressor 10 is driven to cool the storage compartment, the opening amount of the valve 60 is controlled, and the refrigerant is supplied to the evaporator provided in the storage compartment. Be sure to

Next, after sensing the internal temperature of the first and second storage chambers, and determining whether the sensed temperature of the first and second storage chambers is less than or equal to the off-point temperature of the compressor 10, the temperatures inside the first and second storage chambers are all the compressors 10. If the temperature is equal to or lower than the off-point temperature of the drive, the drive of the compressor 10 is stopped, and the opening amount of the valve 60 is controlled.

In this way, the internal temperature of the first and second reservoirs is maintained at the target temperature while controlling the driving of the compressor 10 and the opening amount of the valve 60 based on the internal temperatures of the first and second reservoirs.

At this time, when the target temperatures of the adjacent first and second storage compartments are the same or the operation modes are the same, the internal temperature distribution of each storage compartment is uniform. However, when the target temperatures of the first and second storage chambers that are adjacent to each other or the operation modes are different, the internal temperatures of the storage chambers having a relatively high target temperature are unevenly distributed due to the storage chamber having a relatively low target temperature.

Therefore, in order to uniformize the internal temperature distribution of each storage compartment, the target temperature of the first and second storage compartments adjacent to each other or the target temperatures according to the operating modes of the first and second storage compartments are compared (202), and thus the targets of the first and second storage compartments adjacent to each other are compared. It is determined whether the temperatures are different (203). At this time, if the target temperatures of the adjacent first and second storage chambers are the same, the opening degree of the valve is controlled at a preset time to supply the refrigerant to each evaporator so that each storage chamber is maintained at the target temperature.

However, if it is determined that the target temperatures of the adjacent first and second storage chambers are different from each other, the opening time of the valve 60 for supplying the refrigerant to each evaporator and the holding time corresponding to the opening degree of the valve 60 are changed (205). The refrigerant is supplied to each evaporator while controlling the opening degree of the valve which has been changed in accordance with the opening amount of the valve. At this time, the opening degree of the valve is set differently according to the target temperature difference between the two storage rooms, and since the outside air temperature affects the temperature change inside each storage room, it is based on the outside air temperature detected by the outside air temperature sensor 133. The opening degree of the valve 60 also adjusts the holding time.

This will be described in more detail with reference to FIG. 5 as follows.

As shown in FIG. 5, when the first storage chamber is set to the freezing mode and the second storage chamber to the kimchi mode at an outdoor temperature of 30 ° C., the compressor 10 is driven to cool the first and second storage chambers to a corresponding target temperature. The refrigerant is supplied to the first evaporator 81 and the second evaporator 82 by controlling the opening amount of the valve 60. At this time, the first evaporator 81 and the second evaporator 82 are cooled to a target temperature corresponding to an operation mode in which the temperatures inside the first storage chamber and the second storage chamber are set through heat exchange.

If the internal temperatures of the first and second reservoirs are cooled to the target temperature, the compressor is based on the sensed temperatures of the first and second reservoirs to bring the internal temperatures of the first and second reservoirs to the target temperatures. The opening amounts of the 10 and the valve 60 are continuously controlled. In this case, since the first storage compartment and the second storage compartment have different target temperatures, the distribution of the internal temperature of the second storage compartment in the kimchi mode is uneven due to the influence of the first storage compartment in the freezing mode, thereby deteriorating food stored in the second storage compartment. Accordingly, in order to uniformize the internal temperature distribution of the second storage chamber, the supply time of the refrigerant supplied to the second evaporator 82 provided in the second storage chamber is set longer than the first evaporator 81 provided in the first storage chamber. . That is, the valve 60 sets the opening time of the valve opening in the 'B' direction to 30 seconds, sets the opening time of the valve opening in the 'C' direction to 180 seconds, and then 30 seconds to the first evaporator 81. While supplying the refrigerant and supplying the refrigerant to the second evaporator 82 for 180 seconds, the temperature distribution of the second reservoir is made uniform.

If the first storage compartment is set to the freezing mode and the second storage compartment to the kimchi mode at an outdoor temperature of 20 ° C., it is determined that the outside air temperature does not significantly affect the temperature distribution of the second storage room. The supply time of the refrigerant supplied to the evaporator 82 is shortened. That is, the valve 60 sets the opening time of the valve opening in the 'B' direction to 30 seconds, and sets the opening time of the valve opening in the 'C' direction to 120 seconds, and then 30 to the first evaporator 81. By supplying the refrigerant for a second and the refrigerant for 120 seconds to the second evaporator 82 so that the temperature distribution of the second storage compartment is uniform.

In addition, when the first storage chamber is set to the meat mode and the second storage chamber to the kimchi mode at an outdoor temperature of 30 ° C., the driving amount of the compressor 10 and the opening amount of the valve 60 to cool the first and second storage chambers to the corresponding target temperatures. The refrigerant is supplied to the first evaporator 81 and the second evaporator 82 by controlling. At this time, the first evaporator 81 and the second evaporator 82 are cooled to a target temperature corresponding to an operation mode in which the temperatures inside the first storage chamber and the second storage chamber are set through heat exchange.

If the internal temperatures of the first and second reservoirs are cooled to the target temperature, the compressor is based on the sensed temperatures of the first and second reservoirs to bring the internal temperatures of the first and second reservoirs to the target temperatures. The opening amounts of the 10 and the valve 60 are continuously controlled. At this time, since the first storage compartment and the second storage compartment have different target temperatures, the distribution of the internal temperature of the second storage compartment in the kimchi mode is uneven due to the influence of the first storage compartment in the meat mode, thereby deteriorating the food stored in the second storage compartment. Accordingly, in order to uniformize the internal temperature distribution of the second storage chamber, the supply time of the refrigerant supplied to the second evaporator 82 provided in the second storage chamber is set longer than the first evaporator 81 provided in the first storage chamber. . That is, the valve 60 sets the opening time of the valve opening in the 'B' direction to 30 seconds, sets the opening time of the valve opening in the 'C' direction to 100 seconds, and then 30 seconds to the first evaporator 81. While supplying the refrigerant and supplying the refrigerant to the second evaporator 82 for 100 seconds so that the temperature distribution of the second reservoir is uniform.

If the first storage compartment is set to the freezing mode and the second storage compartment to the kimchi mode at an outdoor temperature of 20 ° C., it is determined that the outside air temperature does not significantly affect the temperature distribution of the second storage room. The supply time of the refrigerant supplied to the evaporator 82 is shortened. That is, the valve 60 sets the opening time of the valve opening in the 'B' direction to 30 seconds, sets the opening time of the valve opening in the 'C' direction to 80 seconds, and then 30 seconds to the first evaporator 81. While supplying the refrigerant and supplying the refrigerant to the second evaporator 82 for 80 seconds, the temperature distribution of the second storage compartment is made uniform.

In addition, since the target temperature in the meat mode is relatively higher than the target temperature in the first storage compartment in the freezing mode, the temperature distribution of the second storage compartment in the kimchi mode in the kimchi mode when the first storage chamber is in the meat mode is relatively higher. It is judged that there is less influence, and the refrigerant supply time to the second evaporator is further shortened.

As described above, when the target temperatures of the storage chambers adjacent to each other are different from each other, the temperature distribution of the storage chamber having a relatively high target temperature can be made uniform by changing and controlling the opening degree holding time of the valve according to the opening amount of the valve.

1A is a cycle diagram illustrating a refrigerator in accordance with one embodiment of the present invention.

1B is a cycle diagram illustrating a refrigerator in accordance with another embodiment of the present invention.

2 is a control block diagram of a refrigerator according to an embodiment of the present invention.

3A is an opening degree control graph of a valve provided in a refrigerator according to an embodiment of the present invention.

3B is an opening degree control graph of a valve provided in a refrigerator according to another embodiment of the present invention.

4 is a control flowchart of a refrigerator according to an embodiment of the present invention.

5 is an opening degree control table of the valve provided in the refrigerator according to an embodiment of the present invention.

Description of the Related Art [0002]

10: compressor 20: condenser

30: clister pipe 40: hot pipe

50: dryer 60: valve

71 to 73 capillaries 81 to 83 evaporator

90: accumulator

Claims (9)

A plurality of storage rooms; A plurality of evaporators respectively provided in the plurality of storage chambers to cool the storage chambers; A valve for controlling the amount of refrigerant supplied to the plurality of evaporators; And a controller configured to compare target temperatures of the plurality of storage chambers and control an opening amount and an opening holding time of the valve according to the comparison result. The method of claim 1, And an outside air temperature sensing unit for sensing a temperature outside the storage compartment. The control unit is a refrigerator for controlling the opening and holding time of the valve based on the outside temperature. The method of claim 1, wherein the control unit If the evaporator to which the refrigerant is supplied is set in advance corresponding to the opening amount of the valve, and the target temperatures of the plurality of storage chambers are different from each other, the opening degree holding time of the valve corresponding to the opening amount of the valve is set to set the evaporator. Refrigerator to control the amount of refrigerant supplied to the. The method of claim 3, wherein the control unit Refrigerator for controlling the opening time of the valve corresponding to the evaporator of the storage chamber having a relatively high target temperature of the plurality of storage chambers as the difference between the target temperature of the plurality of storage chambers increases In the control method of the refrigerator having a plurality of evaporators respectively provided in the plurality of storage chambers, and a valve for controlling the amount of refrigerant supplied to the plurality of evaporators, Comparing target temperatures of the plurality of storage rooms, The control method of the refrigerator for controlling the opening amount and opening time of the valve according to the comparison result. 6. The method of claim 5, wherein the opening time holding time of the valve is controlled. Detect the outside temperature of the storage compartment, And controlling the opening degree of the valve based on the outside temperature. 7. The method of claim 6, wherein adjusting the opening and holding time of the valve The control method of the refrigerator further comprising increasing the opening time of the valve as the outside air temperature increases, but increasing the amount of refrigerant supplied to the evaporator of the storage compartment having a relatively high target temperature among the plurality of storage chambers. 6. The method of claim 5, wherein the opening time holding time of the valve is controlled. And controlling the opening degree holding time of the valve corresponding to the opening amount of the valve as the difference between target temperatures of the plurality of storage compartments increases. The method of claim 8, wherein the long opening time of the valve is controlled. The control method of the refrigerator comprising increasing the amount of refrigerant supplied to the evaporator of the storage chamber of the relatively high target temperature of the plurality of storage chambers.

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