JP2004085198A - Refrigerator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device for a refrigerator changing a temperature set value according to the operation factor of a compressor 18. <P>SOLUTION: This refrigerator is provided with a first series circuit 25 determining an operation start temperature for operating the compressor in a prescribed temperature range, and an operation stop temperature for stopping the compressor based on the set temperature set by a temperature setting means for setting the temperature of a refrigerating chamber, and the control device 20 for controlling the operation of the compressor based on the operation start temperature and operation stop temperature set by the first series circuit and the temperature of the refrigerating chamber detected by a temperature sensor for detecting the temperature of the refrigerating chamber. The control device 20 measures the operating time and stop time of the compressor 18 to compute the operation factor of the compressor, and changes the temperature range band of the operation start temperature and operation stop temperature based on the computed operation factor. <P>COPYRIGHT: (C)2004,JPO

Description

The present invention relates to a refrigerator that changes a control temperature range in temperature control of a refrigerator based on an operation rate of a compressor and an on / off cycle time.

The control device of the cooling device disclosed in Patent Document 1 prior to the present invention controls the operation of the compressor in a predetermined temperature range based on the detected temperature of the space. Further, the control device is configured to control the predetermined temperature range when the operating ratio of the compressor determined by the ratio of the operating period of the compressor and the sum of the operating period and the stop period is smaller than a predetermined operating ratio. Is configured to enlarge.

Further, in Patent Document 2 preceding the present invention, there is provided a control device which is provided with a sensor for detecting the outside air temperature, and is configured such that when the outside air temperature is low, a predetermined temperature range is expanded so that a stop period of the compressor becomes long. Was disclosed.

In the above Patent Document 1, in adjusting the predetermined temperature range, the operating rate of the compressor is measured, and when the measured operating rate becomes smaller than the predetermined operating rate, the predetermined temperature range is expanded. The control differential is expanded by this expansion operation (although the operation rate of the compressor after the change in the temperature range is likely to be larger than the predetermined operation rate), and it becomes larger than the predetermined operation rate by checking the next operation rate. Then, the control differential is reduced. For this reason, in the control operation of expanding the predetermined temperature range when the operation ratio is smaller than the predetermined operation ratio, the temperature range may increase or decrease every on / off cycle of the compressor. There has been a problem that the temperature of the freezing compartment is hardly stabilized by the increasing / decreasing operation, and the temperature influence on other storage compartments cannot be ignored.

On the other hand, in the control device of Patent Document 2, not only the outside air temperature sensor is increased, but also when the outside air temperature is low, early cooling is necessary, for example, when a large heat load (for example, warm food or the like) is stored in the refrigerator. Nevertheless, since the outside air temperature is low, the control temperature range is large and it is easy to delay returning to the cooling operation, so the surrounding temperature rises and the quality of the surrounding food and the food stored in other storage rooms is reduced. There was such a problem.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a refrigerator in which a temperature range in control means for controlling operation of a compressor is changed based on an operation rate of the compressor.
JP-A-2-11567 JP-A-56-130573

The present invention prevents the freezing compartment from becoming cold in a refrigerator that detects the temperature of the refrigerator compartment and controls the temperature of the refrigerator instead of the freezing compartment.

According to a first aspect of the present invention, an operation start temperature for operating the compressor in a predetermined temperature range and an operation stop temperature for stopping the compressor are set based on the set temperature set by the temperature setting means for setting the temperature of the refrigerator compartment. A control temperature setting unit to be determined, and operation of the compressor based on the operation start temperature and the operation stop temperature set by the control temperature setting unit and the refrigerator compartment temperature detected by the temperature detection means for detecting the temperature of the refrigerator compartment. Control means for controlling the operation time and the stop time of the compressor to calculate an operation rate of the compressor, and based on the calculated operation rate, the temperature of the operation start temperature and the operation stop temperature. By changing the width band, the operation rate of the compressor can be set appropriately, and by controlling the temperature of the refrigerating compartment, the freezing compartment can be prevented from becoming uncooled.

According to a second aspect of the present invention, an operation start temperature for operating the compressor at a predetermined temperature range and an operation stop temperature for stopping the compressor are set based on the set temperature set by the temperature setting means for setting the temperature of the refrigerator compartment. A control temperature setting unit to be determined, and operation of the compressor based on the operation start temperature and the operation stop temperature set by the control temperature setting unit and the refrigerator compartment temperature detected by the temperature detection means for detecting the temperature of the refrigerator compartment. Control means for controlling, the control means measures the operation time and stop time of the compressor, calculates the operation rate of the compressor, and calculates the operation start temperature and the operation stop temperature based on the calculated operation rate. The temperature range is changed, and the compressor is forcibly operated when the compressor is turned on and when the compressor is stopped for a certain period of time or more. Driving machine I am able to do it.

According to the first aspect of the present invention, the operation start temperature for operating the compressor at a predetermined temperature range based on the set temperature set by the temperature setting means for setting the temperature of the refrigerator compartment, and the operation stop for stopping the compressor. A control temperature setting section for determining a temperature, and a temperature of the compressor based on the refrigerator temperature detected by the temperature detection means for detecting the operation start temperature, the operation stop temperature, and the temperature of the refrigerator compartment set by the control temperature setting section. Control means for controlling the operation, the control means measures the operation time and the stop time of the compressor to calculate the operation rate of the compressor, and the operation start temperature and the operation stop temperature based on the calculated operation rate. , The operating rate of the compressor can be set appropriately, and by controlling the temperature of the refrigerating compartment, the freezing compartment can be prevented from becoming uncooled.

According to the second aspect of the present invention, the operation start temperature for operating the compressor in a predetermined temperature range based on the set temperature set by the temperature setting means for setting the temperature of the refrigerator compartment, and the operation stop for stopping the compressor. A control temperature setting section for determining a temperature, and a temperature of the compressor based on the refrigerator temperature detected by the temperature detection means for detecting the operation start temperature, the operation stop temperature, and the temperature of the refrigerator compartment set by the control temperature setting section. Control means for controlling the operation, the control means measures an operation time and a stop time of the compressor to calculate an operation rate of the compressor, and based on the calculated operation rate, an operation start temperature and an operation stop This compressor is forcibly operated when the temperature range of the temperature is changed, and when the power of the compressor is turned on and when the stoppage of the compressor continues for a certain period of time or more, the operation rate of the compressor is optimized. Can be set Both can be forcibly operated compressor even when the outside air temperature is below the set temperature. Based on the operation cycle time of the compressor measured by the cycle time measurement section and the operation rate measured by the operation rate measurement section, the temperature differential of the temperature control of the freezing compartment is changed by the temperature width control section (that is, a predetermined temperature width). Thus, the control differential can be appropriately set based on the fluctuation of the operation cycle time and the operation rate, and the temperature control of the freezing room can be performed more finely than before, and the cooling room and the ice green room can be controlled. And a control device suitable for very fine temperature control of the whole refrigerator can be provided.

Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a side sectional view of a refrigerator of the present invention, FIG. 2 is a control circuit diagram of the present invention, FIG. 3 is a switching flow chart showing a flow of changing a temperature setting width of the present invention, and FIG. FIG. 5 is a flowchart illustrating the operation of the refrigerator control device of the present invention, FIG. 6 is a flowchart illustrating the operation of the refrigerator control device of the present invention, and FIG. 7 is a flowchart illustrating the operation of the refrigerator of the present invention. FIG. 8 is a flowchart illustrating the operation of the control device, and FIG. 8 is a flowchart illustrating the operation of the refrigerator control device of the present invention.

Reference numeral 1 denotes a refrigerator, which is composed of an outer box 2 made of a steel plate having an open front, an inner box 3 made of a hard resin such as ABS with an interval provided inside the outer box, and an inner box and an outer box. The main body 5 is constituted by a heat insulating material 4 made of urethane foam which is filled by an in-situ foaming method, and the opening of the main body is closed by doors 6 and 7.

Reference numeral 8 denotes a horizontal partition wall for partitioning the inside of the main body 5 up and down. Above the horizontal partition wall, a freezing room 9 is cooled to a freezing temperature, and a lower portion is a refrigerator room 10 cooled to a temperature at which food does not freeze. The interior of the freezer compartment 9 is partitioned forward and backward by a partition plate 11, and a cooling chamber 12 is defined behind the partition plate, and a cooler 13 is provided vertically in the cooling chamber. A blower 14 is provided above the center of the cooler, and a defrost heater 15 is provided below the cooler 13.

(4) The partition plate 11 is provided with an outlet 16 for blowing cool air into the freezer compartment 9 upward, and a return port 17 for returning cool air blown into the freezer compartment 9 to the lower side of the cooler 13 below.

(4) The refrigerant compressed by the compressor 18 provided on the lower back surface of the main body 5 is supplied to the cooler 13 to exchange heat with the air in the refrigerator to cool the refrigerator.

Reference numeral 19 denotes a temperature sensor for detecting the temperature in the refrigerator compartment 10. This temperature sensor controls the on / off control of the compressor 18 when the temperature in the refrigerator compartment 10 exceeds the operation start temperature or the operation stop temperature within the temperature setting range. The detection means of the control device 20 is formed.

As shown in FIG. 2, the temperature control device 20 includes a microcomputer 21, a first resistor 22, a second resistor 23, and a variable resistor connected to the microcomputer 21 for setting an operation start temperature and an operation stop temperature. 24, a third series circuit 27 including a third resistor 26 for detecting the temperature of the refrigerator compartment 10 and a temperature sensor 19, and a closed circuit 29 between the compressor 18 and the power supply 28. (Not shown) and a third series circuit 32 of a transistor 31. The microcomputer 21 outputs to the transistor 31 of the third series circuit 32 by the input signals from the first series circuit 25 for temperature setting and the second series circuit 27 for temperature detection in the refrigerator compartment 10 to operate the relay 30. Then, the operation of the compressor 18 is stopped by turning on and off the contacts, the ON time and the OFF time due to the stop of the compressor are detected, and the operation rate based on the ON time and the OFF time is calculated.

(4) The microcomputer 21 controls the compressor 18 to be forcibly operated when the power supply 28 is turned on or when the compressor 18 has not been operated for a certain period of time or longer.

The temperature set values set by the first series circuit 25 are a high temperature range (operation start temperature 10.0 ° C., operation stop temperature 7.0 ° C., differential 3 ° C.), a middle temperature range (operation start temperature 8.0 ° C., Shutdown temperature 6.0 ° C, differential 2 ° C), medium / low temperature range (operation start temperature 7.0 ° C, operation stop temperature 5.0 ° C, differential 2 ° C), low temperature range (operation start temperature 5.0 ° C) , An operation stop temperature of 4.0 ° C., and a differential of 1.0 ° C.).

As shown in FIG. 3, when the compressor 18 is operated in the high temperature range, the compressor 18 continues to operate at the temperature set value when the operation rate is 32% or more, and when the operation rate is 32% or less. The temperature set value is changed to the middle temperature range.

When the temperature set value is operated in the middle temperature range, the operation is continued at the temperature set value when the operation rate is between 21% and 50%, and when the operation rate is 50% or more, the temperature set value is set in the high temperature range. When the operation rate is 21% or less, the temperature set value is changed to the middle / low temperature range.

When the temperature set value is operated in the middle / low temperature range, the operation is continued at the temperature set value when the operation rate is between 10% and 38%, and when the operation rate is 38% or more, the temperature set value is set to the medium temperature range. If the operation rate is 10% or less, the temperature set value is changed to the low temperature range.

When the temperature set value is operated in the low temperature range, the operation is continued at the temperature set value when the operation rate is 25% or less, and when the operation rate is 25% or more, the temperature set value is changed to the medium / low temperature range. You.

The operation flow of the temperature control device 20 of the refrigerator compartment 10 based on the above configuration will be described with reference to the flowcharts of FIGS. First, in step S1, the presence or absence of operation of the compressor 18 is detected. If the vehicle is in operation, the process proceeds to step S6, the counter for forced operation is incremented, and it is determined whether or not 5 minutes have elapsed in step S7. If not, the process proceeds to step S9. If five minutes have elapsed, the forced operation flag is reset in step S8, and the process proceeds to step S9.

If the continuous operation flag is set in step S9, the process proceeds to step S16. If the continuous operation flag is reset in step S9, the continuous operation counter is incremented in step S10, and the continuous operation of the compressor 18 is stopped in step S11. If one hour has not elapsed, the process proceeds to step S16. If one hour has elapsed in step S11, the compressor 18 has stopped. In step S12, a continuous operation flag is set. change.

制 御 The control system change data is cleared in step S14, the change data acquisition start flag is reset in step S15, and the routine goes to step S16. In addition, when the operation is not being performed in step S1, the stop time counter is incremented, and it is determined whether or not one hour has elapsed in step S3. If one hour has not elapsed, the process proceeds to step S16, where one hour has elapsed. If so, the forced operation flag is set in step S4, the counter for forced operation is cleared in step S5, and the process proceeds to step S16.

In step S16, the control change delay counter is incremented. In step S17, it is determined whether or not the delay counter has elapsed for one hour. If the one hour has not elapsed, the process proceeds to step S19. At S18, the control change delay flag is reset, and the routine goes to Step S19. In step S19, it is determined whether or not the compressor 18 is operating. If the compressor 18 is operating, the operation time first counter is incremented in step S20, the normal time first counter is incremented in step S21, and the process proceeds to step S22 to stop. If so, the process moves to step S22 via step S21.

In step S22, it is determined whether or not one hour has elapsed. If one hour has elapsed, the start flag of the second counter is set in step S23, and the process proceeds to step S24. Move to S24.

In step S24, it is determined whether or not two hours have elapsed since the start flag of the second counter was set. If the two hours have not elapsed, the process proceeds to step S28. If the two hours have elapsed, the process proceeds to step S25. The control change start flag is set, the operation time first counter is copied to the confirmation RAM in step D26, the operation time first counter is cleared in step S27, and the process proceeds to step S28.

In step S28, the presence or absence of the start flag of the second counter is determined. If the start flag is set, the presence or absence of operation of the compressor 18 is determined in step S29. If the start flag is set, the operation time is determined in step S30. The second counter is incremented, the normal time is incremented in step S31, and the process proceeds to step S32. If the compressor 18 is not operating in step S29, the process proceeds to step S32 via step S31. In step S32, it is determined whether two hours have elapsed. If not, the process proceeds to step S36. If two hours have elapsed, the control change start flag is set in step S33, and the operation is started in step S34. The second time counter is copied to the confirmation RAM, and the operation time second counter is cleared in step S35. To migrate to S36. If the start flag of the second counter has been reset in step S28, the process proceeds to step S36.

In step S36, the presence or absence of a change data acquisition start flag is determined. If the start flag is reset, the process proceeds to step S38. If the start flag is set, in step S37, the presence or absence of a control change delay flag is determined. If the delay flag is set, the process proceeds to step S38. If the control change delay flag has been reset, the flow shifts to step S39. In step S38, the control method change data is cleared, and the flow shifts to step S39.

In step S39, the presence or absence of a control change start flag is determined. If the start flag is reset, the process proceeds to step S58. If the control change start flag is set, in step S40 the presence or absence of operation of the compressor 18 is determined. Is determined, the process proceeds to step S58 when the compressor 18 is stopped in step S40, and proceeds to step S41 when the compressor 18 is operating.

In this step S41, it is determined whether or not the control system 1 is used. If the current operation is being performed by the control system 1, the process proceeds to step S42. In steps S26 and S34, the operation time stored in the RAM is calculated. When the operation time is shorter than T1 (39 minutes) in step S42, the process shifts to step S43 to change to the control method 2 and shifts to step S56. If the operation time is longer than T1 in step S42, the process proceeds to step S57 without changing the control method.

In step S41, if the current operation is not operated by the control method 1, the process proceeds to step S44. In step S44, it is determined whether the operation of the compressor 18 is the control method 2 or not. When the vehicle is operated in the method 2, the process proceeds to step S45, and the operation time stored in the RAM in step S26 and step S34 is compared with T2S (26 minutes) in step S45, and the operation time is shorter than T2S. At this time, the flow shifts to step S46 to change to control method 3, and then shifts to step S56. When the operation time is longer than T2S in step S45, the process proceeds to step S47. In step S47, the operation time stored in the RAM in step S26 and step S34 is compared with T2L (60 minutes) in step S47. When the operation time is longer than T2L, the process shifts to step S48 to change to the control method 1, and shifts to step S56. When the operation time is shorter than T2L in step S47, the process proceeds to step S57 without changing the control method.

If the current operation is not being operated by the control method 2 in step S44, the process proceeds to step S49, and in this step S49, it is determined whether or not the operation of the compressor 18 is the control method 3 and the current operation is performed by the control method 3 If the operation time is shorter than T3S in step S50, the operation time stored in the RAM in step S26 and step S34 is compared with T3S (13 minutes) in step S50. The flow shifts to step S51 to change to control method 4, and shifts to step S56.

If the operation time is longer than T3S in step S50, the process proceeds to step S52, and the operation time stored in the RAM in step S26 and step S34 is compared with T3L (45 minutes) in step S52, and the operation time is calculated from T3L. If is longer, the process shifts to step S53 to change to control method 2, and shifts to step S56. When the operation time is shorter than T3L in step S52, the process proceeds to step S57 without changing the control method.

If the current operation is not being operated by the control method 3 in step S49, the process proceeds to step S54, and the operation time stored in the RAM in step S26 and step S34 is compared with T4 (30 minutes) in step S54. When the operation time is longer than the leverage T4, the process proceeds to step S55 to change to the control method 3, the process proceeds to step S56, the control change delay flag is set, the control change delay counter is cleared, and the control is performed in step S57. The change start flag is reset, and the routine goes to Step S58.

In step S39 or step S57, the control change start flag for changing to any one of the control methods is reset. In step S58, it is determined whether the control change start flag is control method 1 or not. In S59, the operation stop temperature is set to the set value plus 1 ° C., and in Step S60, the differential temperature is set to 3 ° C., and the process proceeds to Step S69.

If the control change start flag is not the control method 1 in step S58, the process proceeds to step S61. In step S61, it is determined whether the control change start flag is the control method 2. If the control method 2 is the control method, the operation stop temperature is determined in step S62. Is set to the set value, the differential temperature is set to 2 ° C. in step S63, and the routine goes to step S69.

If the control change start flag is not the control method 2 in step S61, the process proceeds to step S64. In step S64, it is determined whether the control change start flag is the control method 3. If the control method is 3, the operation stop temperature is determined in step S65. Is set to the set value minus 1 ° C., the differential temperature is set to 2 ° C. in step S66, and the routine goes to step S69.

If the control change start flag does not indicate the control method 3 in step S64, the process proceeds to step S67. In step S67, the operation stop temperature is set to the set value minus 2 ° C., and in step S68, the differential temperature is set to 1 ° C. Move to step S69.

It is determined in step S69 whether or not the forced operation flag is present. If the forced operation flag is set in step S69, the process proceeds to step S77, and if the forced operation flag is reset, the process proceeds to step S70 to change the compressor. It is determined whether or not the compressor 18 is in operation. If the compressor 18 is operating, the process proceeds to step S71. In step S71, the temperature sensor 19 is compared with the operation stop temperature. If the temperature is equal to or lower than the operation stop temperature, the process shifts to step S72 to stop the operation of the compressor 18, sets a change data acquisition start flag in step S73, sets a continuous operation flag in step S74, and shifts to step S1. . If the temperature detected by the temperature sensor 19 is equal to or higher than the operation stop temperature in step S71, the process proceeds to step S1.

If the compressor 18 is not operating in step S70, the process proceeds to step S75, the operation start temperature is set in this step S75, the temperature sensor 19 is compared with the operation start temperature in step S76, and the temperature sensor 19 detects the temperature. If the temperature is equal to or higher than the operation start temperature, the process proceeds to step S77 to start the operation of the compressor 18, the stop counter is cleared in step S78, the process proceeds to step S1, and the cycle is repeated.

As described above, since the temperature control unit 20 changes the temperature setting range of the refrigerator compartment based on the fluctuation of the operation rate in the temperature setting range, the optimal temperature setting is performed according to the operation rate of the compressor 18. It is possible to prevent the freezing room 9 from being cooled down by the outside air temperature, and to turn on the power supply 28 when the outside air temperature is lower than the set temperature, or to operate the compressor 18 for a certain period of time or less. The compressor 18 is forcibly operated, and the freezer 9 does not operate at a low outside air temperature in winter or the like, and the freezing room 9 rises in temperature. So that it can be prevented.

As described above, since the temperature control unit 20 changes the temperature setting range of the refrigerator compartment based on the fluctuation of the operation rate in the temperature setting range, the optimal temperature setting is performed according to the operation rate of the compressor 18. It is possible to prevent the freezing room 9 from being cooled down by the outside air temperature, and to turn on the power supply 28 when the outside air temperature is lower than the set temperature, or to operate the compressor 18 for a certain period of time or less. The compressor 18 is forcibly operated, and the freezer 9 does not operate at a low outside air temperature in winter or the like, and the freezing room 9 rises in temperature. So that it can be prevented.

According to the present invention, a control for determining an operation start temperature for operating the compressor in a predetermined temperature range and an operation stop temperature for stopping the compressor based on the set temperature set by the temperature setting means for setting the temperature of the refrigerator compartment. A temperature setting section controls the operation of the compressor based on the operation start temperature and the operation stop temperature set by the control temperature setting section and the refrigerator compartment temperature detected by the temperature detection means for detecting the temperature of the refrigerator compartment. Control means for measuring an operation time and a stop time of the compressor to calculate an operation rate of the compressor. Based on the calculated operation rate, a temperature range of an operation start temperature and an operation stop temperature is provided. Is changed, the operating rate of the compressor can be set appropriately, and the freezing compartment can be prevented from cooling down by controlling the temperature of the refrigerator compartment.

According to the present invention, a control for determining an operation start temperature for operating the compressor in a predetermined temperature range and an operation stop temperature for stopping the compressor based on the set temperature set by the temperature setting means for setting the temperature of the refrigerator compartment. A temperature setting section controls the operation of the compressor based on the operation start temperature and the operation stop temperature set by the control temperature setting section and the refrigerator compartment temperature detected by the temperature detection means for detecting the temperature of the refrigerator compartment. Control means for measuring an operation time and a stop time of the compressor, calculating an operation rate of the compressor, and calculating a temperature range of the operation start temperature and the operation stop temperature based on the calculated operation rate. The band is changed, and the compressor is forcibly operated when the power of the compressor is turned on and when the compressor is stopped for a certain period of time or more, so that the operation rate of the compressor can be set optimally, Temperature can be forcibly operated compressor even when below the set temperature.

Based on the operation cycle time of the compressor measured by the cycle time measurement section and the operation rate measured by the operation rate measurement section, the temperature differential of the temperature control of the freezing compartment is changed by the temperature width control section (that is, a predetermined temperature width). Thus, the control differential can be appropriately set based on the fluctuation of the operation cycle time and the operation rate, and the temperature control of the freezing room can be performed more finely than before, and the cooling room and the ice green room can be controlled. And a control device suitable for very fine temperature control of the whole refrigerator can be provided.

It is a side sectional view of the refrigerator of the present invention. It is a control circuit diagram of the present invention. It is a switching flow figure showing the flow of change of the temperature set width of the present invention. It is a flowchart explaining operation | movement of the control apparatus of the refrigerator of this invention. It is a flowchart explaining operation | movement of the control apparatus of the refrigerator of this invention. It is a flowchart explaining operation | movement of the control apparatus of the refrigerator of this invention. It is a flowchart explaining operation | movement of the control apparatus of the refrigerator of this invention. It is a flowchart explaining operation | movement of the control apparatus of the refrigerator of this invention.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Refrigerator 10 Refrigerator 18 Compressor 19 Temperature sensor 20 Temperature controller

Claims (2)

A freezing compartment, a refrigerating compartment, and an operation start temperature for operating the compressor at a predetermined temperature range based on the set temperature set by the temperature setting means for setting the temperature of the refrigerating compartment, and an operation stop for stopping the compressor. A control temperature setting unit for determining a temperature, the operation start temperature and the operation stop temperature set by the control temperature setting unit, and a refrigerator room temperature detected by a temperature detection unit that detects a temperature of the refrigerator room. And a control means for controlling operation of the compressor,
The control means measures an operation time and a stop time of the compressor, calculates an operation rate of the compressor, and changes a temperature range of the operation start temperature and the operation stop temperature based on the calculated operation rate. A refrigerator characterized by being made to work. A freezing compartment, a refrigerating compartment, and an operation start temperature for operating the compressor at a predetermined temperature range based on the set temperature set by the temperature setting means for setting the temperature of the refrigerating compartment, and an operation stop for stopping the compressor. A control temperature setting unit for determining a temperature, the operation start temperature and the operation stop temperature set by the control temperature setting unit, and a refrigerator room temperature detected by a temperature detection unit that detects a temperature of the refrigerator room. And a control means for controlling operation of the compressor,
The control means measures an operation time and a stop time of the compressor, calculates an operation rate of the compressor, and changes a temperature range of the operation start temperature and the operation stop temperature based on the calculated operation rate. And a compressor for forcibly operating the compressor when power is supplied to the compressor and when the compressor is stopped for a predetermined time or more.

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