KR19990046211A - Defrost cycle control method of the refrigerator - Google Patents

Abstract

Disclosed is a method of controlling a defrosting cycle of a refrigerator to reduce a rise in internal temperature and power consumption by reducing a driving time of a heater in a defrost mode. The defrost cycle control method of the refrigerator may include determining whether the refrigerator is in a defrost mode; Performing a precool mode in the defrost mode; Driving the refrigerating compartment fan simultaneously with the operation of the defrost heater upon completion of the precool mode; Comparing the refrigerator compartment temperature detected by the refrigerator compartment sensor of the refrigerator with the defrost temperature detected by the defrost sensor; When the refrigerator compartment temperature is above the defrost temperature, the refrigerator compartment is turned off and only the defrost heater is driven. Therefore, by reducing the driving time of the defrost heater during the defrost mode, it is possible to minimize the temperature rise in the refrigerator and to reduce the power consumption.

Description

Defrost cycle control method of the refrigerator.

The present invention relates to a method of controlling a defrosting cycle of a refrigerator, and more particularly, to a method of controlling a defrosting cycle of a refrigerator to reduce a driving time of a heater by driving a refrigerating compartment fan in synchronization with driving of a defrosting heater during defrosting.

In general, the conditions to be considered during the defrost cycle are: cumulative compressor operation time (6, 8, 10 hours), compressor operation rate (compressor operation cumulative operation time 2 hours), compressor operation time + compressor stop Time (more than 60 hours), cumulative door open time, outside temperature, errors of various sensors (D-sensor, F-sensor, outside temperature sensor) and door switch error.

The inrush condition to the defrost mode is a door that does not satisfy the above defrost inrush condition when the compressor operation rate is 2% or more when the defrost inrush condition is satisfied at 6, 8 and 10 hours of operation time of the compressor. When the open cumulative time is 10 minutes or more, when the outside temperature is 35 degrees or more and the compressor operation cumulative time is 6 hours or more, various types of errors occur and the defrost is started.

Then, if the operating time of the compressor + the stop time of the compressor is 60 hours or more, it immediately enters the defrost mode.

In addition, if the cumulative operation time of the compressor is 10 hours or more, the defrost mode is unconditionally entered. In the usual case, when the cumulative time of the compressor reaches 10 hours, the compressor is defrosted.

On the other hand, the defrost mode goes through the process of precooling, heater defrosting, rest period, fan delay, etc., Pre-COOL step is the step that the compressor, F-Fan is on for 50 minutes and time (50 minutes) Even if this time has not elapsed, the flick function is turned off if the temperature detected by the F-sensor is below -27 ° C.

In the defrosting step of the heater (HTR), the heater is turned off when the temperature detected by the D-sensor is 10 ° C. or more, and the limit time is 80 minutes. When the D-sensor is an error, the heater is driven on for 40 minutes.

The pause period is 4 minutes, and the compressor, F-fan and R-fan are all off, the fan delay time is 5 minutes and only the compressor is turned on.

During normal operation of the refrigerator, the temperature detected by the defrost detection sensor (D-sensor) of the refrigerator varies in response to the operation rates of the compressor, the F-fan, and the R-fan of the refrigerator.

By the way, when the amount of frost attached to the refrigerator is large, the defrosting cycle is lengthened. When the defrost heater is driven for a long time, the temperature in the refrigerator is increased, thereby increasing power consumption.

The present invention was created in order to solve the above problems, while simultaneously operating the defrost heater and the refrigerating compartment fan to reduce the driving time of the defrost heater until the refrigerating compartment temperature becomes higher than the defrost temperature during the defrost mode of the refrigerator. It is an object of the present invention to provide a method for controlling a defrost cycle of a refrigerator.

1 is a configuration diagram of a defrost cycle control method of a refrigerator according to the present invention;

2 is a flowchart illustrating the present invention.

<Description of the symbols for the main parts of the drawings>

10 ... R-sensor 20 ... F-sensor

30 ... D-sensor 40 ... Microcomputer

50 ... R fan drive 60 ... R fan

70 ... F fan drive 80 ... F fan

90 Compressor drive 100 Compressor

110 Defrost heater drive 120 Defrost heater

Defrost cycle control method of the refrigerator according to the present invention for achieving the above object comprises the steps of determining whether the refrigerator is in defrost mode; Performing a precool mode in the defrost mode; driving the refrigerating compartment fan at the same time as the defrost heater when the precool mode is completed; Comparing the refrigerator compartment temperature detected by the refrigerator compartment sensor of the refrigerator with the defrost temperature detected by the defrost sensor; When the refrigerator compartment temperature is above the defrost temperature, the refrigerator compartment fan is characterized in that it comprises the step of driving only the defrost heater.

According to a feature of the present invention configured as described above, the defrost cycle control method of the refrigerator according to the present invention, by driving the defrost heater and the refrigerating chamber fan at the same time during defrosting to reduce the driving time of the defrost heater to reduce the internal temperature rise and power consumption You can do it.

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

Defrost cycle control method of the refrigerator of the present invention, referring to Figure 1, the R-sensor 10, F-sensor 20, D-sensor 30, the microcomputer 40, the R-fan drive unit 50, An R fan 60, an F fan driving unit 70, an F fan 80, a compressor driving unit 90, a compressor 100, a defrost heater driving unit 110, and a defrost heater 120 are included.

In this configuration, the R-sensor 10 detects the refrigerator compartment temperature (generally, the voltage value of the DC level) of the refrigerator and applies it to the A / D (Analog to Digital) port of the microcomputer 40 described later.

The F-sensor 20 senses a freezer temperature (generally, a DC level voltage value) of the refrigerator and applies it to the A / D (Analog to Digital) port of the microcomputer 40 which will be described later.

The defrost detection sensor is applied to an A / D (Analog to Digital) port of the microcomputer 40, which will be described later, of a defrost temperature (generally, a DC level voltage value) detected by the D-sensor 30.

In addition, the microcomputer 40 independently drives and controls the F fans, the R fans 80 and 60, and the compressor 100, which will be described later, based on the appropriate temperature of the detected refrigerator which is applied to each A / D port and digitally converted. When the defrosting condition is reached, the defrosting heater 120 is driven to remove frost attached to the evaporator.

The R fan driver 50 outputs a predetermined drive signal to the R fan 60 under the control of the microcomputer 40 using a drive element, a relay, and the like. The R fan 60 is a fan dedicated to a refrigerating chamber. It is driven based on a drive signal from the fan driver 50 to discharge cold air around the evaporator to the refrigerating chamber.

The F fan driver 70 outputs a predetermined drive signal to the F fan 80 under the control of the microcomputer 40 using a drive element, a relay, and the like, and the F fan 80 is a fan for a freezer compartment. And driven based on the drive signal from the F fan drive unit 70 to discharge cold air around the evaporator to the freezer compartment.

The compressor driver 90 outputs a predetermined drive signal to the compressor 100 under the control of the microcomputer 40 using a drive element, a relay, and the like.

The defrost heater driver 110 outputs a predetermined drive signal to the defrost heater 120 under the control of the microcomputer 40, and the defrost heater 120 is a heater for removing frost attached to the evaporator and is mounted on the evaporator. In accordance with the drive signal from the defrost heater driving unit 110 to generate heat to melt and remove the frost attached to the evaporator.

Next, the operation of the defrost cycle control method of the refrigerator according to the preferred embodiment of the present invention including the aforementioned configuration will be described in detail with reference to the flowchart of FIG. 2.

First, it is determined whether the refrigerator is in the defrost mode (step 200). If the refrigerator is not in the defrost mode, normal operation is performed.

When the refrigerator enters the defrost mode by the defrost cycle, the compressor and the F-fan are driven on for 50 minutes, and the free state is turned off when the temperature detected by the F-sensor is lower than -27 ℃ even if the time (50 minutes) has not elapsed. Perform the PRE-COOL step (step 220).

When the precooling step is completed (step 230), the defrost heater and the refrigerating compartment fan are simultaneously driven for a predetermined time (step 240).

Next, when the refrigerator compartment temperature detected by the refrigerator compartment sensor and the defrost temperature sensed by the defrost sensor are compared and judged (step 250), when the refrigerator compartment temperature exceeds the defrost temperature, the refrigerator compartment fan is turned off (the refrigerator compartment defrost section), and only the existing defrost heater is used. Operation is performed to defrost. (Step 260).

In the defrosting step of the heater (HTR), the heater is turned off when the temperature detected by the D-sensor is 10 ° C. or more, and the limit time is 80 minutes. When the D-sensor is an error, the heater is driven on for 40 minutes.

Accordingly, when the defrost temperature detected by the defrost sensor is 10 ° C. or more (step 270), a rest period is passed, and the rest period is 4 minutes and all of the compressor, the F-fan, and the R-fan are turned off (step 280).

Next, the fan delay step is performed, and the fan delay time is 5 minutes and only the compressor is driven on (step 290).

The defrosting cycle control method of the refrigerator according to the present invention can minimize the temperature rise in the refrigerator and reduce power consumption by reducing the driving time of the defrost heater by simultaneously driving the refrigerating chamber fan during the defrosting operation. Will be.

Claims (1)

Determining whether the refrigerator is in defrost mode; Performing the precool mode in the defrost mode; Driving the refrigerating compartment fan simultaneously with the operation of the defrost heater upon completion of the precool mode; Comparing and determining a refrigerator compartment temperature detected by a refrigerator compartment sensor of the refrigerator and a defrost temperature detected by a defrost sensor; And defrosting the refrigerator compartment fan and driving only the defrost heater when the refrigerator compartment temperature is equal to or greater than the defrost temperature.