KR20000021972A - Method of controlling low temperature of refrigerator - Google Patents

Abstract

PURPOSE: A low temperature controlling method is provided to prevent weak freezing of a freezing chamber by controlling the driving of a fan. CONSTITUTION: A low temperature controlling method of a refrigerator composed of a first temperature detection part(10), a second temperature detection part(20), a microcomputer(30), a fan driving part(40), a fan(50), a compressor driving part(60) and a compressor(70) is operated by the steps of: detecting indoor temperature of the refrigerator and feeding the temperature to an A/D port of the microcomputer in the first temperature detection part; detecting outdoor temperature of the refrigerator and feeding to the A/D port of the microcomputer in the second temperature detection part; and controlling the driving on/off of the fan and the compressor by repeatedly setting up the driving off point of the fan and the compressor and the chopping time to the difference value according to the outdoor temperature is under 20°C in the microcomputer.

Description

How to control the low temperature of the refrigerator

The present invention relates to a method for controlling a low temperature of a refrigerator. In particular, when a temperature of the refrigerator is controlled in a refrigerator having a freezing compartment and a refrigerating compartment, the refrigerator is prevented from generating a weak cooling phenomenon in the freezer compartment when the external temperature of the refrigerator is low. The present invention relates to a method for controlling low temperature of a refrigerator to maintain a temperature of a freezer compartment appropriately.

Generally, a refrigerator is a household appliance used to freeze and refrigerate food by using a cooling cycle. The refrigerator exchanges refrigerant gas, which has been compressed at high and high pressure in a compressor, to the outside air in a condenser. After liquefied by filtration in the receiver dryer (Receiver dryer), through the capillary tube (Capillary Tube) is adiabatic expansion with low-temperature, low-pressure liquid refrigerant.

In particular, a fan-cooling refrigerator exchanges heat with cavity air in a cabinet circulated by a fan in an evaporator to freeze and refrigerate food stored by evaporative heat of refrigerant absorbed. Temperature control is performed as the drive / stop control of the fan and the compressor.

On the other hand, among such fan-cooling refrigerators in which cold air around an evaporator is forced to convectively by a fan and cooled, a refrigerator having a temperature control centered on a refrigerator compartment temperature has one fan in a freezer compartment. A fan for discharging cold air around the detected temperature and a compressor for converting a low pressure low temperature refrigerant gas into a high pressure high temperature refrigerant gas in order to liquefy a gaseous refrigerant, thereby controlling the cold air around the evaporator in the freezer compartment and the refrigerator compartment The temperature of the refrigerator is maintained at an appropriate temperature.

In detail, if the detected refrigerator compartment temperature is higher than or equal to a predetermined upper limit temperature, the fan and the compressor are driven on and controlled. If the detected refrigerator compartment temperature is lower than or equal to the preset lower limit temperature, the fan and the compressor are controlled to be driven off to control the refrigerator and the freezer compartment. Perform temperature control.

However, when the temperature around the place where the refrigerator is continuously maintained is kept low, the internal temperature of the refrigerating compartment is also kept low, whereby the fan and the compressor are driven off for a long time.

Therefore, the temperature of the refrigerating chamber can be maintained below the appropriate upper limit temperature, but there is a problem that the freezing chamber weak cooling phenomenon occurs because the temperature of the freezing chamber rises by driving off the fan and the compressor for a long time.

In order to solve this problem, the sensing temperature of the sensor is arbitrarily set to maintain the temperature of the freezer compartment by forcibly driving the fan and the compressor. In this case, the excessive performance of the fan and the compressor causes the refrigerator to deteriorate, and There is a problem that the supercooling phenomenon occurs.

The present invention was created to solve the above problems, in the refrigerator to control the temperature of the refrigerator centered on the temperature of the refrigerating chamber, when the room temperature is controlled at low temperature by controlling the chopping time of the fan on / off the fan The present invention provides a method of controlling a low temperature of a refrigerator that can prevent the freezing chamber from being weakly cooled by controlling driving.

1 is a block diagram of a low temperature control method of a refrigerator employed according to a preferred embodiment of the present invention;

2 is a flowchart illustrating a low temperature control process of a refrigerator in accordance with a preferred embodiment of the present invention.

<Explanation of symbols for main parts of the drawings>

10 ... first temperature detector 20 ... second temperature detector

30.Microcomputer 40 ... Fan drive

50 ... fan 60 ... compressor drive

70 ... compressor

In the method of controlling the low temperature of the refrigerator of the present invention for achieving the above object, in the method of controlling the temperature of the refrigerating compartment and the freezer compartment by having a fan for blowing cold air around the evaporator from the refrigerator to the refrigerating compartment and the freezing compartment, Detecting a temperature to determine whether the detected external temperature is equal to or less than a predetermined reference threshold room temperature; Setting a differential value and chopping time at which the fan is driven on / off in proportion to the external temperature if the detected external temperature is below a reference threshold room temperature; Determining whether the fan is driven on according to the set differential value and the chopping time, controlling the fan to be turned off when the drive is not driven, and determining whether the chopping time has elapsed when the driving is turned on; And driving the fan when the chopping time has not elapsed, and stopping the fan when the chopping time has elapsed.

According to the above-described feature of the present invention, the low temperature control method of the refrigerator of the present invention is a refrigerator for controlling the temperature of the refrigerator with respect to the temperature of the refrigerating compartment, wherein the fan is controlled by controlling the chopping time of the fan according to the external temperature at low temperature. By controlling the on / off driving, it is possible to prevent the freezing chamber weak cooling phenomenon.

Hereinafter, with reference to the accompanying drawings will be described in detail a low temperature control method of the refrigerator of the present invention.

1 is a block diagram of a method for controlling a low temperature of a refrigerator according to the present invention, wherein a first temperature detector 10, a second temperature detector 20, a microcomputer 30, a fan driver 40, and a fan 50 are provided. , A compressor driver 60, and a compressor 70.

In this configuration, the first temperature detector 10 is installed at a predetermined position in the refrigerating compartment to detect the room temperature of the refrigerating compartment and to return the refrigerating compartment temperature detection signal to the A / D (Analog to Digital) port of the microcomputer 30. Is applied.

The second temperature detector 20 is installed at a predetermined position outside the refrigerator to detect a temperature outside the refrigerator and apply an external temperature detection signal to the A / D port of the microcomputer 30 which will be described later.

On the other hand, if the external temperature detected based on the external temperature detection signal applied from the second temperature detection unit 20 through the A / D port from the second temperature detection unit 20 is higher than the predetermined reference threshold room temperature (for example, 20 ℃) Perform normal operation.

In addition, when the detected external temperature is less than or equal to a predetermined reference threshold room temperature, that is, 20 ° C. or less, the microcomputer 30 may be configured to the off point and the on / off differential value of the driving cycle of the fan 50 and the compressor 70 according to the detected external temperature. By resetting the chopping time, the fan 50 and the compressor 70 are driven on / off control.

The fan driver 40 outputs a predetermined drive signal to the fan 50 under the control of the microcomputer 30 using a drive element, a relay, and the like, and the fan 50 is driven from the fan driver 40. Driven based on the signal, the cold air around the evaporator (not shown) is discharged to the freezing compartment and the refrigerating compartment.

In addition, the compressor driver 60 outputs a predetermined drive signal to the compressor 70 under the control of the microcomputer 30 using a drive element, a relay, or the like, and the compressor 70 is vaporized in the aforementioned refrigeration cycle. As a preliminary step for liquefying and reusing the used refrigerant, the refrigerant gas of low temperature and low pressure from the evaporator, not shown, is compressed and converted into a refrigerant gas of high temperature and high pressure, and outputted to a condenser, not shown.

Next, the low temperature control process of the refrigerator according to the preferred embodiment of the present invention including the above-described configuration will be described in detail with reference to the flowchart of FIG. 2.

First, the first temperature detector for detecting the temperature of the refrigerator compartment and the second temperature detector for detecting the outside temperature of the refrigerator detect the temperatures of the refrigerator compartment and the refrigerator, respectively, and output a refrigerator compartment temperature detection signal and an external temperature detection signal (generally, a DC level voltage). Value) It is applied to A / D port of microcomputer.

Next, when the external temperature detection signal is digitally converted and applied to the microcomputer, it is determined whether the detected external temperature is equal to or less than a predetermined reference threshold room temperature (20 ° C. in the preferred embodiment of the present invention).

At this time, if the detected external temperature is equal to or greater than the reference threshold room temperature, temperature control of the refrigerator is performed in the normal operation mode (step 200).

On the other hand, if the outside temperature detected in the above-described step is less than the reference threshold room temperature, the temperature of the refrigerating compartment is also relatively low. Since the fan and the compressor maintain the driving off for a long time, the driving rate of the fan and the compressor is low, so that the freezing of the freezer may occur Can be.

Therefore, according to the present invention, according to the change in the detected external temperature, the appropriate upper limit temperature, which is the temperature at which the fan and the compressor are driven on, is lowered, and the proper lower limit temperature, which is the temperature at the time of driving the fan and the compressor off, is controlled to increase the temperature. By setting the driving off point of the lower limit, the chopping control of the fan drive is performed.

Next, when the fan driving condition is reached during the fan chopping control (step 400), it is determined whether the chopping control time has elapsed (step 500), and the fan is driven off when the elapsed time (step 700). Will be turned on. (Step 600)

If it is not the driving condition of the fan in the above-described step is to turn off the fan (step 700).

As described above, according to the present invention, in controlling the temperature of the refrigerator centered on the temperature of the refrigerator compartment, when the outside temperature of the refrigerator is low temperature, the freezer compartment and the refrigerator compartment can be maintained at an appropriate temperature while preventing a weak cooling phenomenon of the freezer compartment.

Claims (1)

In the method of controlling the temperature of the refrigerator compartment and the freezer compartment by having a fan for blowing cold air around the evaporator from the refrigerator to the refrigerator compartment and the freezer compartment, Detecting an external temperature of the refrigerator to determine whether the detected external temperature is equal to or less than a preset reference threshold room temperature; Setting a differential value and a chopping time at which the fan is driven on / off in proportion to the external temperature if the detected external temperature is less than or equal to the reference threshold room temperature; Determining whether the fan is driven on according to the set differential value and the chopping time, and controlling the fan to be off if the driving condition is not, and determining whether the chopping time has elapsed when the driving on condition is performed; And driving the fan when the chopping time has not elapsed and stopping the fan when the chopping time has elapsed.