KR101652523B1 - A refrigerator and a control method the same - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator and a control method for the refrigerator. More particularly, the present invention relates to a refrigerator and a control method for the refrigerator.
According to an embodiment of the present invention, there is provided a refrigerator including: a compressor having an operation frequency set in a normal refrigeration cycle; A condenser for condensing the refrigerant discharged from the compressor, an expansion device for reducing the pressure of the refrigerant passing through the condenser, and an evaporator for evaporating the refrigerant passing through the expansion device; A plurality of temperature sensors each sensing an inlet temperature and an outlet temperature of the evaporator; A memory unit for storing a cooling power value of the compressor corresponding to an inlet / outlet temperature difference of the evaporator sensed by the plurality of temperature sensors; And a compressor controller for controlling the compressor to increase the frequency of the compressor over the operation frequency according to the refrigeration power value stored in the memory unit when the temperature of the inlet and outlet of the evaporator is sensed at the time of starting the compressor.
According to the refrigerator of the present embodiment, since the inlet temperature and the outlet temperature of the evaporator are sensed and the cooling power of the compressor can be varied according to the difference of the temperatures, the cooling power can be effectively controlled according to the internal load of the refrigerator .

Description

A refrigerator and a control method for the same

An embodiment of the present invention relates to a control method of a refrigerator and a refrigerator.

Generally, a refrigerator is a device that can cool a storage room (a freezer compartment or a refrigerating compartment) while repeating a refrigeration cycle to store food for a predetermined period of time.

The refrigerator includes a compressor for compressing the refrigerant circulating in the refrigeration cycle to high temperature and high pressure. The refrigerant compressed in the compressor generates cold air while passing through the heat exchanger, and the generated cold air is supplied to the freezer compartment or the refrigerating compartment.

According to the conventional refrigerator, the compressor is driven by determining the cooling power according to the temperature (hereinafter referred to as "room temperature") of the space where the refrigerator is installed. Here, the cooling power may be defined as a power input to the compressor, which is a power value required for the compressor to adjust the cooling power of the refrigerator.

As shown in FIG. 1, in the conventional refrigerator, the cooling power (power) for driving the compressor in accordance with the room temperature (RT) is predetermined. For example, when the room temperature is 43 ° C, the cooling power of the compressor is adjusted to a maximum P1 (W), and when the room temperature is 30 ° C, the cooling power of the compressor can be adjusted to a maximum P2 (W). Here, P1 may have a value larger than P2.

When the indoor temperature is 20 ° C, the cooling power of the compressor is P 3 lower than the P 2, and when the room temperature is 10 ° C, the cooling power of the compressor becomes P 4 lower than the P 3.

The cooling power of the compressor can be varied with a certain pattern. For example, when the room temperature is 43 ° C, the cooling power of the compressor is increased to P1 until the time t1 elapses after the compressor is driven, and the cooling power of P1 is maintained until the time t2 elapses.

When the internal temperature of the refrigerator reaches the required temperature at the time t2, the cooling power of the compressor is reduced, and the compressor is turned off at time t3. Thereafter, when the internal temperature of the refrigerator rises to a predetermined temperature or more, the compressor is turned on again and is driven in the previous pattern.

In this way, in the conventional refrigerator, the cooling power of the compressor is determined according to the temperature (external load) outside the refrigerator, and the compressor is driven, so that the state of the refrigeration cycle driven by the actual refrigerator is not well reflected.

For example, when the room temperature is high but the temperature of the refrigerator storage room is low (low temperature load), that is, when the cooling capacity of the storage room is sufficiently secured, the compressor is driven with high cooling power according to the room temperature, There is an increased problem.

On the other hand, when the room temperature is low but the temperature of the refrigerator storage compartment is high (high temperature load), that is, when the cooling capacity of the storage compartment is insufficient, the compressor is driven with low cooling power according to the room temperature, There is a problem in that it becomes poor.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a refrigerator which can vary the cooling power of a compressor according to an inlet temperature and an outlet temperature of an evaporator.

According to an aspect of the present invention, there is provided a refrigerator including: a compressor having an operation frequency set in a normal refrigeration cycle; A condenser for condensing the refrigerant discharged from the compressor, an expansion device for reducing the pressure of the refrigerant passing through the condenser, and an evaporator for evaporating the refrigerant passing through the expansion device; A plurality of temperature sensors each sensing an inlet temperature and an outlet temperature of the evaporator; A memory unit for storing a cooling power value of the compressor corresponding to an inlet / outlet temperature difference of the evaporator sensed by the plurality of temperature sensors; And a compressor controller for controlling the compressor to increase the frequency of the compressor over the operation frequency according to the refrigeration power value stored in the memory unit when the temperature of the inlet and outlet of the evaporator is sensed at the time of starting the compressor.

According to another aspect of the present invention, there is provided a control method for a refrigerator including: initializing a compressor for which an operation frequency is set; After the initial start-up of the compressor, the inlet and outlet temperatures of the evaporator are sensed; Increasing the frequency of the compressor by the cooling power corresponding to the temperature difference between the inlet and outlet of the evaporator; Decreasing the frequency of the compressor when the inlet / outlet temperature difference of the evaporator is within a first set temperature range; And a step of driving the compressor at the operation frequency when the temperature difference between the inlet and the outlet of the evaporator is within a second set temperature range in a process of reducing the frequency of the compressor.

The refrigerator according to the embodiment of the present invention can detect the inlet temperature and the outlet temperature of the evaporator and vary the cooling power of the compressor according to the difference value of the temperatures so that the cooling power can be effectively controlled according to the internal load of the refrigerator .

Further, when the temperature difference between the inlet and outlet of the evaporator is large, it is determined that the internal load of the refrigerator is large and the cooling power of the compressor is increased. When the temperature difference is small, the internal load of the refrigerator is determined to be small, There is an effect that the cooling power control can be performed.

In addition, it is possible to prevent unnecessary cooling power from being generated according to the cooling power control of the compressor, so that power consumption can be reduced.

Further, since the cooling state of the refrigerator storage chamber can be maintained well, the reliability of the product can be improved.

1 is a graph showing variable control of the compressor cooling power of a conventional refrigerator.
2 is a perspective view showing a configuration of a refrigerator according to a first embodiment of the present invention;
3 and 4 are views showing the construction of a refrigeration cycle according to a first embodiment of the present invention.
FIG. 5 is a block diagram showing a configuration of a refrigerator according to a first embodiment of the present invention; FIG.
FIG. 6 is a graph showing the temperature of the inlet and outlet of the evaporator and the temperature of the freezing chamber according to the first embodiment of the present invention. FIG.
7 is a graph showing variable control of the cooling power of the compressor according to the inlet and outlet temperatures of the evaporator.
FIG. 8 is a flowchart showing a control method of a refrigerator according to the first embodiment of the present invention. FIG.
FIG. 9 is a block diagram showing a configuration of a refrigerator according to a second embodiment of the present invention; FIG.
10 is a flow chart showing a control method of a refrigerator according to a second embodiment of the present invention.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

FIG. 2 is a perspective view showing a configuration of a refrigerator according to a first embodiment of the present invention, and FIGS. 3 and 4 are views showing a configuration of a refrigeration cycle according to a first embodiment of the present invention.

2 to 4, a refrigerator 1 according to an embodiment of the present invention includes a main body 10 for forming a refrigerating chamber 20 and a freezing chamber 30. The refrigerating compartment 20 is provided on the upper side of the freezing compartment 30 and the refrigerating compartment 20 and the freezing compartment 30 are partitioned by a partition wall 17.

The refrigerator 1 further includes refrigerator compartment doors 11 and 12 and a freezing compartment door 15 for selectively shielding the refrigerating compartment 20 and the freezing compartment 30, respectively. The refrigerator compartment doors 11 and 12 are rotatably coupled to the main body 10 and the freezer compartment door 15 is provided so as to be drawn out to the front of the freezer compartment 30.

In the rear lower portion of the main body 10, a machine room 35 accommodating a plurality of components constituting the refrigeration cycle is formed.

The machine room 35 is provided with a compressor 60 for compressing the refrigerant at a high temperature and a high pressure, a condenser 70 and a condensing fan 72 for condensing the refrigerant discharged from the compressor 60, And an expansion device (80) for reducing the pressure of the passed refrigerant to low temperature and low pressure refrigerant.

An evaporator (90) for evaporating the refrigerant passing through the expansion device (80) to generate cold air is provided on the machine room (35). The evaporator (90) is disposed in the rear space of the freezer compartment (30).

In detail, the evaporator 90 includes a refrigerant pipe 92 through which the refrigerant flows, and a heat exchange fin 94 disposed to be spaced apart from the refrigerant pipe 92 to perform heat exchange between the refrigerant and the surrounding cool air .

The refrigerant pipe 92 is provided with an inlet portion 92a formed at the inlet side of the refrigerant pipe 92 and through which the refrigerant flowing from the expansion device 80 flows and a refrigerant passing through the refrigerant pipe 92, And an outlet 92b for allowing the refrigerant to flow to the compressor 60 side.

The outlet portion 92b is provided with a gas-liquid separator 98 for separating the liquid refrigerant in the refrigerant before the refrigerant flowing through the refrigerant pipeline 92 flows into the compressor 60.

The inlet portion 92a is provided with a first temperature sensor 95 for sensing the temperature of the refrigerant flowing through the inlet portion 92a and the outlet portion 92b is provided with the outlet portion 92b A second temperature sensor 96 is provided to allow the temperature of the refrigerant flowing to be sensed.

The first temperature sensor 95 and the second temperature sensor 96 are respectively called "evaporator inlet sensor" and "evaporator outlet sensor" in that they sense the inlet refrigerant temperature and the outlet refrigerant temperature of the evaporator 90 You can do it.

5 is a block diagram showing the configuration of a refrigerator according to a first embodiment of the present invention.

Referring to FIG. 5, a refrigerator 1 according to an embodiment of the present invention includes a compressor control device 100 that controls the compressor 60.

The compressor control apparatus 100 includes a rectifying unit 110 for rectifying and smoothening and supplying DC power from an external power supply unit and converting the supplied DC power into an AC voltage according to a PWM signal, 60 for supplying the operating frequency to the inverter unit 130. [

The compressor control unit 100 determines an operation frequency which is increased or decreased from a voltage / current applied to the compressor 60 and outputs a PWM signal for operating the compressor 60 according to the operation frequency And applies the generated control signal to the inverter unit 130.

The refrigerator (1) includes a refrigerator control unit (200) for controlling a refrigeration cycle and a first memory (220) for storing information necessary for driving a refrigeration cycle.

In the first memory 220, frequency information available in the refrigeration cycle (hereinafter referred to as "available frequency") may be stored in advance. Here, the available frequency may be set in a range of approximately 55 to 65 Hz. However, the range of the usable frequency may be set to be wider according to the cooling power of the compressor (60).

The operation frequency determined by the compressor control unit 120 may be transmitted to the refrigerator control unit 200 and the refrigerator control unit 200 controls the refrigeration cycle according to the operation frequency.

Meanwhile, the refrigerator controller 200 may determine whether the operating frequency determined by the compressor controller 120 is within the available frequency range.

The refrigerator controller 200 may feedback the available frequency range to the compressor controller 120 and the compressor controller 120 may control to determine or change the operating frequency that may correspond to the available frequency range .

That is, the compressor control unit 120 may increase or decrease the operation frequency to increase or decrease the cooling power of the compressor 60.

The refrigerator (1) includes an evaporator inlet sensor (95) for sensing the inlet refrigerant temperature of the evaporator (90) and an evaporator outlet sensor (96) for sensing the outlet refrigerant temperature. The temperature detected by the evaporator inlet sensor 95 and the evaporator outlet sensor 96 may be transmitted to the refrigerator controller 200.

The refrigerator control unit 200 can calculate the difference in temperature values sensed by the evaporator inlet sensor 95 and the evaporator outlet sensor 96, that is, the inlet / outlet temperature difference of the evaporator 90 (evaporator outlet temperature-evaporator inlet temperature) , And may transmit the calculated value to the compressor controller 120.

The compressor control apparatus 100 includes a second memory 180 for storing the refrigerant value (operation frequency value) of the compressor 60 corresponding to the temperature difference between the inlet and outlet of the evaporator 90.

The compressor control unit 120 obtains a cooling power value stored in the second memory 180 from an inlet and outlet temperature difference of the evaporator 90 received from the refrigerator control unit 200 and controls the compressor 60 Can be controlled.

FIG. 6 is a graph showing changes in temperature of the inlet and outlet of the evaporator and temperature of the freezing chamber according to the first embodiment of the present invention, and FIG. 7 is a graph showing the variable control of the cooling power of the compressor according to the inlet and outlet temperatures of the evaporator.

6 shows the freezer compartment temperature line L1, the evaporator outlet temperature line L2 and the evaporator inlet temperature line L3. In FIG. 7, the refrigerant variable line (L3) of the compressor 60, which is variably controlled in accordance with the evaporator inlet / L4 are shown.

Referring to FIGS. 6 and 7, when the power of the refrigerator 1 is turned on, the compressor 60 is initially started at time T0. The temperature of the inlet and the outlet of the evaporator 90 and the temperature of the freezing chamber 30 are set to the same value as the room temperature, for example, 30 [deg.] C Lt; / RTI >

It is to be noted in advance that the inlet and outlet temperatures of the evaporator 90 and the temperature values of the freezer compartment 30 described below will be described as an example only and can be measured or set at different values depending on the room temperature or the capacity of the refrigerator.

When the compressor 60 is initially activated, the inlet temperature of the evaporator 90 drops sharply while the refrigerant circulates along the refrigeration cycle, and the outlet temperature of the evaporator 90 is relatively lowered relatively.

Since the temperature of the air in the freezing chamber to be heat-exchanged is high, the outlet temperature of the evaporator 90 is formed higher than the inlet temperature when heat exchange is performed in the evaporator 90.

Ideally, the inlet and outlet temperatures of the evaporator should be measured at the same value. However, when the compressor 60 is initially started, the normal refrigeration cycle is not started. If the predetermined time (see T2 in FIG. 6) has elapsed and a sufficient cooling power is secured, a normal refrigeration cycle may be driven thereafter.

As a result, the inlet / outlet temperature difference of the evaporator 90 exists for a predetermined time after the compressor 60 is initially activated. For example, at a point in time after the initial startup of the compressor 60, the inlet temperature of the evaporator 90 may be measured to be -5.7 ° C, the outlet temperature to 8.1 ° C, and the freezer compartment temperature to be 21.5 ° C.

However, if the compressor 60 is driven to a certain extent after the inlet temperature of the evaporator 90 is rapidly lowered, the temperature of the inlet of the evaporator 90 may rise to some extent. This is because the discharge pressure of the compressor (60) and the condensation temperature of the condenser (70) are raised to a certain level on the driving of the refrigeration cycle, and the overall cycle temperature rises.

Therefore, the temperature difference between the inlet and outlet of the evaporator 90 is gradually narrowed over time.

In this process, the greater the temperature difference between the inlet and outlet of the evaporator 90, the larger the internal load of the refrigerator can be judged to be. That is, in order to drive a normal refrigeration cycle in a short period of time, the larger the inlet / outlet temperature difference of the evaporator 90, the larger the cooling power required of the compressor 60 is.

In detail, the cooling power of the compressor (60) can be controlled to be increased until the time when the inlet / outlet temperature difference of the evaporator (90) exists after the initial startup of the compressor (60).

Here, the cooling power of the compressor (60) is controlled by adjusting the number of revolutions of the motor provided in the compressor (60), and the number of revolutions of the motor can be changed in proportion to a frequency supplied to the motor.

Therefore, by increasing or decreasing the frequency applied to the compressor (60), the cooling power of the compressor (60) can be increased or decreased. As a result, at the initial start of the compressor 60, the frequency of the compressor 60 can be controlled to rise above the operation frequency.

The increase of the cooling power of the compressor 60 can be raised to the time T1 corresponding to the point M at which the inlet and outlet temperatures of the evaporator 90 are equal to each other. The size of the cooling power of the compressor (60) can be increased to w1. After the time T1, it is possible to control the cooling power of the compressor 60 to be reduced.

Alternatively, even if the inlet and outlet temperatures of the evaporator 90 are not equal to each other, when the inlet / outlet temperature difference of the evaporator 90 reaches a predetermined temperature range, the cooling of the compressor 60 is stopped, The cooling power of the compressor 60 may be controlled to decrease.

After the elapse of the time T1, the inlet and outlet temperatures of the evaporator 90 are changed with a substantially similar decreasing width over time. At this time, the inlet temperature of the evaporator (90) may be formed to have a value slightly higher than the outlet temperature of the evaporator (90).

However, since the inlet / outlet temperature difference of the evaporator 90 is not large, the cooling power of the compressor 60 can be controlled to decrease from w1.

The temperature of the outlet of the evaporator 90 may be the same as the temperature of the inlet of the evaporator 90 at a time T2 so that the outlet temperature of the evaporator 90 may be a little higher than the temperature of the inlet of the evaporator 90 .

The refrigerant flows through the refrigerant pipe 92 of the evaporator 90 and a pressure drop occurs so that the outlet temperature of the evaporator 90 has a value somewhat lower than the inlet temperature. In this state, the refrigeration cycle maintains a somewhat stable state (normal range).

Then, at time T3, if the temperature difference between the inlet and the outlet of the evaporator 90 forms a predetermined temperature difference value? T, it is determined that the refrigeration cycle is driven in the normal range. At this time, the cooling power of the compressor (60) is maintained at w2, and the compressor (60) is driven at a set operating frequency. Of course, w2 has a value smaller than w1.

For example, at the time T3, the temperature of the freezing chamber 30 may be -26.8 ° C, and the inlet and outlet temperatures of the evaporator may be -30 ° C and -31.4 ° C, respectively. In this case,? T becomes -1.4 占 폚. Of course, the [Delta] t may be set to a different value in advance.

After the time T3, the inlet temperature and the outlet temperature of the evaporator 90 will be kept substantially constant.

As described above, when the temperature difference between the inlet and the outlet of the evaporator 90 is large after the compressor 60 is initially activated, the cooling capacity of the compressor 60 is increased to correspond to a high load state (cooling power uncertainty) in the refrigerator. On the other hand, when the temperature difference between the inlet and the outlet of the evaporator 90 is not large, the cooling power of the compressor 60 can be reduced and maintained in accordance with the low load state (ensuring the cooling power) in the refrigerator.

By controlling the compressor as described above, it is possible to adjust the cooling power according to the state of the refrigeration cycle, so that the power consumption can be reduced.

FIG. 8 is a flow chart showing a control method of a refrigerator according to the first embodiment of the present invention.

A control method of the refrigerator according to the present embodiment will be described with reference to Fig.

When the refrigerator is turned on and the compressor (60) is initially started, the cooling power of the compressor (60) starts to increase.

Then, the inlet and outlet temperatures of the evaporator 90 are sensed using the evaporator inlet sensor 95 and the outlet sensor 96 (S11, S12, S13).

It is determined whether the inlet / outlet temperature difference (outlet temperature-inlet temperature) of the evaporator 90 is within the first set temperature range. For example, the first set temperature may be set to any value close to 0 ° C or 0 ° C (1 to 2 ° C) (S14).

When the inlet / outlet temperature difference of the evaporator (90) is within the range of the first set temperature, the cooling of the compressor (60) is stopped. Then, the compressor 60 is then controlled so that the cooling power is reduced

If the temperature difference between the inlet and outlet of the evaporator 90 is not within the range of the first set temperature, the process returns to step S13 (S15).

It is determined whether or not the inlet / outlet temperature difference of the evaporator 90 is within the range of the second set temperature in the process of reducing the cooling power of the compressor (60). For example, the second set temperature may be in the range of -1 [deg.] C to -2 [deg.] C (S16).

When the inlet / outlet temperature difference of the evaporator 90 is within the range of the second set temperature, it is determined that the refrigeration cycle is driven in the normal range. Then, the cooling power of the compressor (60) can be kept constant (S17).

If the temperature difference between the inlet and outlet of the evaporator 90 is not within the range of the second set temperature, the process returns to step S15 (S17).

Hereinafter, a second embodiment of the present invention will be described. Since the present embodiment differs from the first embodiment only in a part of the constitution of the compressor control apparatus, the differences will be mainly described, and the description of the first embodiment and the reference numerals will be used for the same parts.

FIG. 9 is a block diagram showing a configuration of a refrigerator according to a second embodiment of the present invention, and FIG. 10 is a flowchart showing a control method of a refrigerator according to a second embodiment of the present invention.

9 and 10, the compressor control apparatus 100 according to the second embodiment of the present invention controls the compressor control unit 100 according to the difference in temperature sensed by the evaporator inlet sensor 95 and the evaporator outlet sensor 96, A second memory 180 for storing the cooling power value of the corresponding compressor 60 in advance and a timer 170 for measuring the driving time of the compressor 60.

The control method of the refrigerator according to the present embodiment will be described with reference to Fig.

When the power of the refrigerator is turned on and the compressor (60) is initially activated, the cooling power of the compressor (60) starts to increase (S21).

The time when the compressor 60 is driven is measured by the timer 170, and it is determined whether the time measured by the timer 170 has passed the first set time (S23).

When the driving time of the compressor (60) has passed the first set time, the temperature of the evaporator inlet / outlet sensor (95) and the evaporator outlet sensor (96) is sensed. The refrigerator control unit 200 calculates an inlet / outlet temperature difference of the evaporator 90 from the inlet temperature and the outlet temperature of the evaporator 90.

However, if the drive time of the compressor 60 has not passed the first set time, the flow returns to step S22 (S24).

The compressor control unit 120 controls the compressor 60 with the cooling power corresponding to the calculated inlet / outlet temperature difference. At this time, in the second memory 180, the cooling power value of the compressor corresponding to the inlet / outlet temperature difference is stored in advance as a table.

As described in the first embodiment, as the temperature difference between the inlet and outlet of the evaporator 90 increases, the compressor 60 will be controlled to a higher first cooling power (S25).

In a state where the compressor 60 is controlled by the first cooling power, it is determined whether or not the second set time has elapsed (S26).

When the driving time of the compressor (60) has passed the second set time, the inlet and outlet temperatures of the evaporator (90) are detected again. The refrigerator control unit 200 calculates an inlet / outlet temperature difference of the evaporator 90 from the inlet and outlet temperatures of the evaporator 90.

However, if the drive time of the compressor 60 has not passed the second set time, the flow returns to step S25 (S27).

The compressor control unit 120 controls the compressor 60 with a second cooling power corresponding to the calculated inlet / outlet temperature difference.

In a state where the compressor (60) is controlled by the second cooling force, it is determined whether or not the inlet / outlet temperature difference of the evaporator (90) is within a predetermined range (S29). Here, the temperature difference within the predetermined range is defined as a reference factor for determining whether the cooling power of the compressor 60 is in a state where it can be kept constant (within a range of a normal refrigeration cycle).

When the inlet / outlet temperature difference of the evaporator 90 is within the predetermined range, it is determined that a normal refrigeration cycle suitable for refrigerator driving is formed, so that the cooling power of the compressor 60 can be kept constant.

However, if the inlet / outlet temperature difference of the evaporator 90 is not within the preset range, the flow returns to step S28 (S30).

In this embodiment, the first set time and the second set time have been described as reference points for sensing the inlet and outlet temperatures of the evaporator 90. Alternatively, however, it is also possible to control the temperature of the evaporator 90 several times . That is, the third set time and the fourth set time may be controlled.

Further, in this embodiment, it is determined whether or not the inlet / outlet temperature difference of the evaporator 90 is within the predetermined temperature range after the second set time has elapsed. However, if the inlet / outlet temperature difference of the evaporator sensed after the lapse of the first set time If it is within the set temperature range, it may be directly executed in step S30.

According to such a control method, since the cooling power of the compressor (60) can be controlled in accordance with the state of the refrigeration cycle of the refrigerator, the cooling power of the refrigerator can be easily secured and the power consumption can be reduced.

60: compressor 90: evaporator
95: Evaporator inlet sensor 96: Evaporator outlet sensor
100: compressor control device 120: compressor control part
170: Timer 180: Second memory
200: refrigerator control unit 220: first memory

Claims (10)

A compressor in which an operation frequency driven in a normal refrigeration cycle is set;
A condenser for condensing the refrigerant discharged from the compressor;
An expansion device for reducing the pressure of the refrigerant passing through the condenser;
An evaporator for evaporating the refrigerant passing through the expansion device;
A plurality of temperature sensors each sensing an inlet temperature and an outlet temperature of the evaporator;
A memory unit for storing a cooling power value of the compressor in advance, corresponding to an inlet / outlet temperature difference obtained by subtracting the inlet temperature from the outlet temperature; And
And a compressor control unit for controlling the frequency of the compressor according to a refrigerant value stored in the memory unit,
The compressor control unit includes:
Increasing the frequency of the compressor over the operating frequency at the initial startup of the compressor,
And controlling the cooling power of the compressor to decrease when the inlet / outlet temperature difference is within the first setting range after the frequency of the compressor is increased,
Wherein the controller controls the cooling power of the compressor to be kept constant when the temperature difference between the inlet and the outlet is in a second set range including a lower temperature range than the lower limit of the first set range in a process of reducing the cooling power of the compressor. The method according to claim 1,
Wherein the cooling force of the compressor is reduced or maintained according to the frequency of the compressor. 3. The method of claim 2,
Wherein the first setting range is 0 ° C. 3. The method of claim 2,
And the second setting range is not less than -1 ° C and not more than -2 ° C. The method according to claim 1,
Further comprising a timer for measuring a driving time of the compressor,
Wherein the inlet and outlet temperatures of the evaporator are sensed after a drive time of the compressor has passed a first set time. delete Initializing a compressor in which an operation frequency is set;
After the initial start-up of the compressor, the inlet and outlet temperatures of the evaporator are sensed;
Increasing the frequency of the compressor by the cooling power corresponding to the inlet / outlet temperature difference obtained by subtracting the inlet temperature from the outlet temperature of the evaporator;
Decreasing the frequency of the compressor when the inlet / outlet temperature difference of the evaporator is within a first set temperature range; And
When the temperature difference between the inlet and outlet of the evaporator is within a second set temperature range including a temperature range lower than the lower limit value of the first set temperature range in the process of reducing the frequency of the compressor, A method of controlling an included refrigerator. 8. The method of claim 7,
Wherein the cooling power of the compressor is increased after the initial startup and the increase of the compressor frequency is stopped when the inlet and outlet temperatures of the evaporator are the same. 8. The method of claim 7,
Further comprising a timer for measuring a driving time of the compressor,
Wherein an inlet temperature and an outlet temperature of the evaporator are sensed when the time measured by the timer reaches a first set time. 8. The method of claim 7,
Wherein the compressor is driven at the operating frequency,
Wherein the inlet temperature and the outlet temperature of the evaporator are kept constant.

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