KR100292187B1 - Defrost cycle variable method - Google Patents

Abstract

The present invention discloses a method of changing the defrosting cycle to sense the outside temperature of the refrigerator and to automatically adjust the defrosting cycle accordingly to improve the cooling performance of the refrigerator. The defrost cycle variable method may include determining whether an operation time of a refrigerator compressor has passed a predetermined first time and: when the predetermined first time has elapsed, compares / determines the outside temperature detected by the outside temperature sensor to determine the outside temperature. Determining whether or not the predetermined temperature is equal to or greater than or equal to a predetermined temperature; and determining whether or not the predetermined operating time or less of the predetermined temperature has elapsed by a predetermined time. If the time elapses after the step of entering the defrost mode. Therefore, the cooling cycle of the refrigerator can be efficiently performed by automatically changing the defrost cycle according to the outside air temperature of the refrigerator.

Description

Defrost cycle variable method

The present invention relates to a defrosting cycle variable method, and more particularly to a defrosting cycle variable method for efficiently performing cooling by varying the defrosting cycle to detect the outside air temperature and correspondingly.

In general, the conditions to be considered during the defrost cycle are: cumulative compressor operation time, compressor operation rate (compression operation cumulative operation time 2 hours), compressor operation time + compressor stop time (more than 60 hours), door Open accumulation 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 that if the defrost inrush condition is satisfied at 6, 8 and 10 hours of the accumulated operation time of the compressor, when the compressor operation rate of the two-hour interval is 80% or more, and the cumulative door open time is 10 minutes or more, When the outside temperature is 35 degrees or more, the compressor starts to defrost when various errors occur for 6 hours or more.

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.

However, when the outside temperature of the refrigerator is lowered, the operation rate of the refrigerator is shortened, and thus the defrosting cycle is lengthened. When defrosting is not performed for a long time, the evaporator is attached to the evaporator to reduce the cooling performance of the refrigerator.

In addition, since the conventional refrigerator defrosting cycle does not detect various changes in the outside air temperature (only outside temperature 35 degrees or more), the defrosting cycle cannot be actively changed according to the outside air temperature, thereby reducing the cooling performance as described above. do.

The present invention has been made to solve the above problems, and provides a defrost cycle variable method for automatically inverting the defrost cycle when the outside temperature changes by setting the defrost cycle differently according to the outside temperature of the refrigerator. There is a purpose.

1 is a configuration diagram of a defrosting period variable method according to the present invention,

2 is a flowchart for explaining the present invention.

* Explanation of symbols for main parts of the drawings

10: outside temperature sensor 20: F-sensor

30: R-sensor 40: D-sensor

50: door detection unit 60: microcomputer

70: compressor driving unit 80: compressor

90: defrost heater driving unit 100: defrost heater

According to the present invention, the variable defrosting cycle method of achieving the above object includes: a) a range of predetermined set temperatures (RT1, RT2) detected by detecting an outside temperature when the operating time of the refrigerator compressor has passed a predetermined operating time (t0); B) maintaining operation of the compressor for a predetermined first operation time (t1, t2, t3) set to correspond to the set temperature (RT1, RT2) range, respectively; c) When the predetermined second operation time (t4, t5) is reached in the process of step b), it is determined whether or not there is an abnormality for each sensor of the refrigerator or the first operation time of the step b) When (t1, t2, t3) is finished, it characterized in that it comprises the step of entering into the defrost mode.

According to the feature of the present invention configured as described above, the defrosting cycle variable method according to the present invention, it is possible to improve the cooling efficiency of the refrigerator by varying the defrosting cycle corresponding to the change in the refrigerator outside temperature.

The preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

In the variable defrosting period of the present invention, referring to FIG. 1, the outside air temperature sensor 10, the F-sensor 20, the R-sensor 30, the defrost detection sensor 40, the door detection unit 50, and the microcomputer ( 60, the compressor driver 70, the compressor 80, the defrost heater driver 90, and the defrost heater 100.

In such a configuration, the outside air temperature sensor 10 applies the outside air temperature detected by the RT-sensor (generally, a DC level voltage value) to the A / D (Analog to Digital) port of the microcomputer 60 described later. .

The F-sensor 20 detects a freezer compartment temperature (generally, a DC value of a voltage level) of the refrigerator and applies it to an A / D (Analog to Digital) port of the microcomputer 60 which will be described later.

The R-sensor 30 detects a refrigerator compartment temperature (generally, a DC level voltage value) of the refrigerator and applies it to the A / D (Analog to Digital) port of the microcomputer 60 which will be described later.

The defrost detection sensor 40 is applied to the A / D (Analog to Digital) port of the microcomputer 60, which will be described later, of the defrost temperature detected by the D-sensor (generally, DC voltage level).

The door detector 50 detects whether the refrigerator door opening has accumulated for a predetermined time, for example, 30 seconds or more, and outputs a door open / close detection signal to the microcomputer 60.

The compressor driver 70 outputs a predetermined drive signal to the compressor 80 based on the control signal of the microcomputer using a drive element, a relay, and the like.

The defrost heater driver 90 outputs a predetermined driving signal to the defrost heater 100 under the control of the microcomputer 60, and the defrost heater 100 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 90 is generated to melt and remove the frost attached to the evaporator.

In addition, the microcomputer 60 is applied with a detection signal from the sensor and the door detector 50 described above, and detects the accumulated operation time of the compressor 80 to output a predetermined driving signal.

Next, a detailed description will be given with reference to a flowchart of FIG. 2 attached to an operation process of a method of varying a defrost period according to a preferred embodiment of the present invention including the above-described configuration unit.

The operation time of the compressor is set by dividing it into t0 (for example, preferably 2 hours), the first operation time t1, t2, t3, t4 and the second operation time t5, t6 in a predetermined time flow order. do.

The temperature of the outside air is set by dividing it into RT1 and RT2 in order of predetermined temperature magnitude. Usually, the temperature is set, for example, RT1 is 5 degrees, and RT2 is preferably 15 degrees.

It is determined whether the operation time of the compressor set as described above has elapsed t0 (step 100), and if t0 has elapsed, RT1, RT2, RT3 are compared / determined (step 102).

If the outside temperature detected by the outside temperature sensor is equal to or lower than RT1 (outside the room) (step 104), it is determined whether the first operating time t1 has elapsed (step 110). (Step 128).

In the case of RT1 or more and RT2 or less (when low room temperature) (step 106) detected by the outside temperature sensor, it is determined whether or not the operation time of the compressor has passed the first operation time t2 (step 112). The defrost mode is entered (step 128).

In addition, when the outside air temperature sensed by the outside air temperature sensor is RT2 or more (typically 35 degrees or less) (step 108), it is determined whether the operating time of the compressor has passed the first operating time t3 (step 114). If the elapsed time passes, the vehicle enters the defrost mode (step 128).

If the operation time of the compressor has not passed the first operation time t1, t2 (step 110, step 112), it is again determined whether the operation time of the compressor has passed the second operation time t4 (step 116). In case of error, the sensor detects whether an error occurs (step 120) and enters the defrost mode when an error occurs (step 128).

If the operation time of the compressor has not elapsed in the first operation time t3 (step 114), the operation time of the compressor again determines whether the second operation time t5 has elapsed (step 118). An occurrence is detected (step 120) and the defrost mode is entered when an error occurs (step 128).

If an error does not occur (step 120), it is determined whether the outside temperature is 35 degrees or more (step 122), and if it is abnormal, it enters the defrost mode (step 128), and if it is below, it is determined whether the operation rate of the compressor is 80% or more ( Step 124).

When the operation rate of the compressor is 80% or more (step 124), it enters the defrost mode (step 128), and when it is below, it is determined whether or not the cumulative door open time is a predetermined time (10 minutes) or more (step 126). If it is more than a predetermined time, for example 10 minutes, it enters the defrost mode (step 128).

On the other hand, the operation time of the compressor according to the range of the above is the time that the compressor is continuously running, the embodiment according to the accumulated operating time of the compressor according to the temperature range is as follows.

First, when the ambient temperature is 5 degrees or more and 15 degrees or less, defrosting is possible when the accumulated operating time of the compressor is 4 hours and 6 hours, and when it is 8 hours, the defrosting mode is unconditionally entered.

In addition, when the ambient temperature is 15 degrees or more and 35 degrees or less, defrosting is possible when the accumulated operating time of the compressor is 6 hours and 8 hours, and when it is 10 hours, the defrosting mode is unconditionally entered.

If the outside temperature is more than 35 degrees, when the cumulative time of the compressor reaches 6 hours unconditionally enters the defrost mode.

The defrosting cycle variable method according to the present invention varies the defrosting cycle according to the change in the outside air temperature, and operates according to a new defrosting cycle unlike the normal operation at low room temperature, it is possible to efficiently perform cooling.

Claims (1)

a) when the operating time of the refrigerator compressor passes a predetermined operating time t0, determining whether the refrigerator is included in a predetermined set temperature range (RT1, RT2) by detecting the outside temperature; and b) the setting. Maintaining operation of the compressor for a predetermined first operation time (t1, t2, t3) set to correspond to the temperature (RT1, RT2) range, respectively; and c) predetermined second predetermined in the course of step b). When the operation time (t4, t5) is reached, it is determined whether there is an error for each sensor of the refrigerator or when the abnormality occurs or when the first operation time (t1, t2, t3) of step b) is finished defrosting Defrost period variable method comprising the step of entering the mode.