KR20000027998A - Method for controlling low room temperature of refrigerator - Google Patents

Abstract

PURPOSE: A method is provided to prevent a refrigerator from overcooling by normally running the refrigerator if the room temperature of the refrigerator is not low. CONSTITUTION: A room temperature of a refrigerator is controlled by the steps of: deciding if a user pushes a winter key to run a refrigerator at low room temperature; deciding if the temperature of a refrigerator is low when detected signals for an external temperature are converted into digital, then fed to a microcomputer; deciding if the detected external temperature is lower than the reference critical room temperature; controlling the temperature of the refrigerator through the normal run mode if the detected temperature is higher than the critical room temperature, that is, it is not under the low room temperature; and normally running the refrigerator even if a user inserts the winter key while normally running if it is not under the low room temperature.

Description

Low temperature control method of the refrigerator.

The present invention relates to a method for controlling low temperature of a refrigerator. In particular, the present invention relates to a method of controlling a low temperature of a refrigerator to prevent overcooling of the refrigerator by performing a normal operation even when a low temperature condition is not applied even when a winter key is input. It is about.

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.

Meanwhile, among these fan-cooling refrigerators in which cold air around an evaporator is forced to convection by a fan and cooled, a refrigerator having a temperature control centered on a refrigerator compartment temperature has one fan in the freezer compartment. A fan that discharges cold air around the detected temperature and a compressor that converts low-pressure low-temperature refrigerant gas into high-pressure high-temperature refrigerant gas in order to liquefy the refrigerant in a gaseous state. 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, if the temperature around the place where the refrigerator is kept is kept low (at low room temperature), the internal temperature of the refrigerating chamber is also kept low, and thus the compressor is operated at 25 minutes of compressor driving and 220 minutes of compressor driving off. The fan and compressor will be off for a long time.

In order to solve this problem, in the case of low room temperature conditions, when the temperature detected by the external temperature sensor is less than 13 ℃ (low room temperature), the refrigerator compartment heater is turned off when the compressor is on, and when the compressor is off, the refrigerator compartment heater is turned on Let's go.

In addition, the sensing temperature of the sensor is arbitrarily set (when the temperature detected by the external temperature sensor is 14 ° C. or more and 19 ° C. or lower, the off point -1 ° C. when the compressor is turned on / off) is forced to drive the fan and the compressor. To maintain the temperature.

By the way, when the winter key is pressed due to a malfunction of the user despite the low temperature condition, the refrigerator operates in the low temperature condition, and the excessive performance of the fan and the compressor causes a decrease in the performance of the refrigerator, as well as the overcooling of the refrigerator. There is a problem that the phenomenon occurs.

In addition, in this case, there is a problem in that the freezing chamber weak cooling occurs due to the temperature of the freezing chamber is increased by the driving off of the fan and the compressor for a long time.

The present invention has been made to solve the above problems, and when the user does not enter the low-temperature conditions when the winter key is input, the low-temperature control method of the refrigerator to prevent normal operation of the refrigerator by performing normal operation The purpose is to provide.

1 is a block diagram of a method for controlling low temperature of a refrigerator according to the present invention;

2 is a flow chart according to a preferred embodiment of the present invention.

<Description of the symbols for the 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

The low temperature control method of the refrigerator according to the present invention, which achieves the above object, comprises: determining whether a user inputs a winter key for controlling the operation of the refrigerator so as to correspond to the case when the refrigerator has a low temperature condition; Determining a case of a low temperature condition according to the external temperature detected by the external temperature sensor of the refrigerator when the winter key is input; And controlling the operation of the refrigerator so as to correspond to the low temperature condition, and performing normal operation if the low temperature condition is not applied even when the winter key is input.

According to a feature of the present invention configured as described above, the low temperature control method of the refrigerator according to the present invention, when the user does not enter the low-temperature conditions when entering the winter key to allow normal operation to prevent the overcooling phenomenon of the refrigerator. .

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.

The microcomputer 30 turns off the refrigerating chamber heater when the compressor is driven on when the detected external temperature is less than or equal to a preset reference threshold room temperature, that is, 13 ° C. or lower (at low room temperature condition A). Will be turned on.

In addition, when the detected external temperature is a predetermined reference threshold room temperature, that is, 14 ° C. or more and 19 ° C. or less (at low room temperature condition B), the microcomputer 30 sets the driving off point of the refrigerator to be lower than −1 ° C. to force the fan and the compressor. By driving, the temperature of the freezer compartment is maintained.

When the user inputs the winter key, the microcomputer 30 determines whether it is a low temperature condition and operates the refrigerator according to the low temperature condition described above in the case of the low temperature condition, and performs normal operation when the temperature key is not low even when the winter key is input. Done.

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 connected to the drive signal from the fan driver 40. Driven on the basis to discharge the cold air around the evaporator (not shown) to the freezer 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, in the normal operation of the refrigerator (step 100), it is determined whether the user presses the winter key for operating the refrigerator in a low temperature condition.

The first temperature detector for detecting the temperature of the refrigerating compartment and the second temperature detector for detecting the external temperature of the refrigerator detect the temperatures of the refrigerating compartment and the refrigerator, respectively, and output a refrigerating compartment temperature detection signal and an external temperature detection signal (generally, a DC level voltage value). Apply to A / D port of microcomputer.

Next, when the user presses the winter key, when the external temperature detection signal is digitally converted and applied to the microcomputer, it is determined whether the external temperature detection condition is a low temperature condition, that is, the detected external temperature is a predetermined reference threshold room temperature (a preferred embodiment of the present invention). 20 ° C.) or less (step 300).

At this time, even when the winter key is detected, if the detected external temperature is equal to or greater than the reference threshold room temperature, that is, the low temperature condition is not performed, the temperature control of the refrigerator is performed in the normal operation mode (step 400).

If the condition is not a low temperature, the refrigerator performs normal operation as it is even when the winter key is input during normal operation.

On the other hand, if the outside temperature detected in the above-described step is less than the reference threshold room temperature (20 ℃), the temperature of the refrigerating chamber is also relatively low, because the drive ratio of the fan and compressor is lowered because the fan and the compressor keeps the drive off for a long time, Weak cooling may occur.

To solve this problem, the microcomputer turns off the refrigerator compartment heater when the compressor is on when the detected external temperature is less than or equal to the preset reference threshold room temperature, that is, 13 ° C or lower (at low room temperature condition A), and turns on the refrigerator compartment heater when the compressor is off. Let's go.

In addition, when the detected external temperature corresponds to the low room temperature condition B (14 ° C. or more and 19 ° C. or less), the temperature at the time of turning off the fan and the compressor is changed to -1 ° C. according to the change of the external temperature. (Step 500)

If the temperature is out of the low temperature condition, the microcomputer determines this and performs normal operation.

As described above, according to the present invention, when the user inputs the winter key, the user determines whether or not the low temperature condition, and thus the normal operation is performed when the user does not have the low temperature condition, thereby preventing the refrigerator from being overcooled due to a malfunction of the user.

Claims (1)

Determining whether the user inputs a winter key for controlling the operation of the refrigerator in response to the refrigerator being in a low temperature condition; Determining a case of a low room temperature condition according to an external temperature detected by an external temperature sensor of a refrigerator when the winter key is input; And controlling the operation of the refrigerator in response to the low temperature condition, and performing normal operation when the low temperature condition is not applied even when the winter key is input.