KR20160091776A - Internal temperature control method for kimchi refrigerator - Google Patents

Abstract

The present invention enables an upper threshold value and a lower threshold value of the control temperature for controlling the temperature inside a refrigerator in accordance with the outdoor temperature to have nonlinearity. The upper threshold value of the control temperature is defined by a mathematical equation y_on = Ax^2 + Bx + C, and the lower threshold value is defined by the mathematical equation y_off = Dx^2 + Ex + F. Moreover, the present invention can more accurately control the target temperature inside the refrigerator to have the target temperature in accordance with the ambient temperature through nonlinear control.

Description

TECHNICAL FIELD [0001] The present invention relates to a temperature control method for a kimchi refrigerator,

The present invention relates to a method for controlling the temperature inside a kimchi refrigerator, and more particularly, to a method for controlling the inside temperature of a kimchi refrigerator that enables a target inside temperature to be controlled to a desired target temperature through nonlinear control according to the ambient temperature .

In the case of a general refrigerator, the temperature inside the refrigerator changes drastically during the frequent opening and closing of the door, and the storage period of the kimchi is short due to contact with the outside air during the removal of the kimchi container from the refrigerator for storing the kimchi in the bowl. It is very difficult to maintain the proper aging condition.

To solve this problem, a kimchi refrigerator has been developed which can keep the taste of ripe kimchi for a long time by moderately aging the kimchi according to seasonal changes and users' preferences and then maintaining the temperature at a proper temperature.

Generally, the Kimchi refrigerator is to ferment and store the kimchi in accordance with the user's preference, such as applying the heat to the kimchi and fermenting it appropriately or cooling the kimchi to a low temperature for a long time in a raw kimchi state, A cooling device and a heating device are provided. In the early stage, the kimchi stored in the inner case is matured in a short time using a heating device, and then the temperature of the inner case is maintained at a proper level Thereby making it possible to preserve the taste and freshness of kimchi for a long time.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a diagram showing a schematic configuration of a temperature control device for a general Kimchi refrigerator. FIG.

As shown in FIG. 1, a general Kimchi refrigerator temperature control device includes an outside temperature sensor 30 for measuring the ambient temperature of the Kimchi refrigerator and transmitting it to the main control unit 20, The controller 50 determines whether or not the compensation is performed based on the temperature value received from the internal temperature sensor 40, the outside temperature sensor 30 and the internal temperature sensor 40 transmitted to the controller 20, A heater 50 which is turned on / off according to a control signal of the main controller 20 to raise the temperature inside the kimchi refrigerator; And a display unit (10) for indicating whether or not to compensate according to a control signal of the main control unit (20).

As described above, the kimchi refrigerator is generally provided with a compressor 60, a condenser (not shown), a cooling fan (not shown), a heater 50 and the like. A heater 50 for raising the temperature of the kimchi and an evaporator pipe (not shown) for flowing a coolant for refrigerating the kimchi are installed to control the internal temperature of the storage compartment by operating the compressor and the heater under the control of the main controller 20.

2 is a diagram illustrating an on / off control method of a compressor for controlling the internal temperature of a conventional Kimchi refrigerator. As shown in FIG. 2, the conventional Kimchi refrigerator linearly controls on / off of the compressor according to the outside temperature.

For example, the room temperature of the Kimchi refrigerator was adjusted to the target temperature through a linear function control of Y = Ax + B (where A and B are coefficients). For example, if -1.0 ° C is set as the target temperature, it is a good way to maintain the target temperature with an error of 1 ° C per outside temperature. That is, it was a good way to maintain the average internal temperature.

However, if you require precise control like a kimchi refrigerator, there is a problem (for example, the degree of fermentation of kimchi varies depending on temperature difference of 1 degree). That is, even if the compressor is controlled in a linear manner, since the actual temperature change in the furnace is nonlinearly controlled, accurate actual furnace temperature control for a desired target temperature is not achieved.

In other words, the linear control method can obtain the result (that is, the actual indoor temperature) obtained by approximating the indoor temperature of the Kimchi refrigerator to the target temperature by controlling the compressor on / off in a linear form of the linear function, The value (ie, the actual in-situ temperature) could not be controlled more precisely.

The background art of the present invention is disclosed in Korean Registered Patent No. 10-0759339 (Registered on September 11, 2007, Temperature Control Method of Kimchi Refrigerator).

The object of the present invention is to provide a method for controlling the internal temperature of a Kimchi refrigerator, which can control a desired inside temperature according to an ambient temperature to a desired target temperature through nonlinear control. have.

A method for controlling the internal temperature of a Kimchi refrigerator according to one aspect of the present invention is a method for controlling the internal temperature of a Kimchi refrigerator according to an outside temperature, the method comprising: Is provided.

In the present invention, the upper limit value of the control temperature is defined according to the formula y _on = Ax ² + Bx + C, where y _on is the internal temperature for turning _on the compressor, x is the external temperature, B, and C are preset values.

In the present invention, the lower limit value of the control temperature is defined according to the expression y _off = Dx ² + Ex + F, where, y _off is a internal temperature for turning off the compressor, x is an outside temperature, D, E, and F are preset values.

In the present invention, it is preferable that the control temperature is an internal temperature for controlling on / off of the compressor, the upper limit value is an internal temperature for controlling the on-state of the compressor, and the lower limit value is an internal temperature for controlling the off- .

The present invention makes it possible to more accurately control the target internal temperature according to the ambient temperature to a desired target temperature through nonlinear control.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is an exemplary diagram showing a schematic configuration of a temperature control device of a general Kimchi refrigerator; FIG.
BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a kimchi refrigerator.
FIG. 3 is a table showing an internal temperature for controlling a compressor, which is calculated according to an internal temperature control method of a Kimchi refrigerator according to an embodiment of the present invention.
FIG. 4 is a graph illustrating a nonlinear trend of internal temperature for controlling a compressor according to an internal temperature control method of a Kimchi refrigerator according to an embodiment of the present invention; FIG.

Hereinafter, an embodiment of a method for controlling the internal temperature of a Kimchi refrigerator according to the present invention will be described with reference to the accompanying drawings.

In this process, the thicknesses of the lines and the sizes of the components shown in the drawings may be exaggerated for clarity and convenience of explanation. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention or custom of the user, the operator. Therefore, definitions of these terms should be made based on the contents throughout this specification.

FIG. 3 is an exemplary view showing a table of internal temperatures for controlling a compressor calculated according to the internal temperature control method of the Kimchi refrigerator according to the embodiment of the present invention, and FIG. 4 is a view showing the internal temperature of the Kimchi refrigerator according to an embodiment of the present invention. Figure 5 is an exemplary graph illustrating the nonlinear trend of internal temperature for controlling a compressor in accordance with an internal temperature control scheme.

As shown in FIG. 4, the embodiment according to the present invention is a nonlinear control temperature according to the temperature of the outside air temperature. The controller 20 shown in FIG. 1 controls the temperature of the compressor (That is, the internal temperature for controlling the on-state of the compressor) and the lower limit value (i.e., the internal temperature for controlling the off-state of the compressor) Thereby making it possible to more precisely control the internal temperature. That is, it is possible to control the error range with respect to the target temperature to be smaller than the conventional one.

The in-housing temperature of the Kimchi refrigerator according to the present embodiment has non-linearity with respect to the upper limits of the following equations (1) and (2) (i.e., the temperature at which the compressor is turned on) and the lower limit (the temperature at which the compressor is turned off).

First, the upper limit value of the control temperature (i.e., the temperature at which the compressor is turned on) is as shown in Equation (1).

Where y _on is the internal temperature for turning _on the compressor, x is the ambient temperature, and A, B, and C are preset values.

Here, y _off is the internal temperature for _{turning off} the compressor, x is the outside temperature, and D, E, and F are preset values.

The upper and lower limit values of the internal temperature for turning on / off the compressor according to the warmth temperature are non-linearly controlled through Equations (1) and (2) with the external temperature (x) as a variable.

By non-linearly controlling the on / off of the compressor through the above-described Equations 1 and 2 (i.e., polynomial), it is possible to follow the non-linearly varying actual in-cylinder temperature so that an accurate in- .

3 and 4, the upper limit value of the control temperature (that is, the internal temperature for controlling the on / off of the compressor) at the outside air temperatures of 32 degrees, 25 degrees, 15 degrees, and 5 degrees And the lower limit value (that is, the internal temperature for controlling the OFF state of the compressor) will be described as follows.

First, the upper limit of the control temperature at the outside temperature of 32 degrees is 2.3 degrees, which is smaller than that of the conventional control temperature upper limit value of 2.4 degrees. Also, the control temperature lower limit value at the outside temperature of 32 degrees is 1.2 degrees, which is smaller than the control temperature lower limit value at the time of the conventional linear control at 2 degrees.

On the other hand, the upper limit of the control temperature at the outside temperature of 25 degrees is 1.6 degrees, which is the same value as the case where the upper limit of the control temperature during the conventional linear control is 1.6 degrees, but the lower limit of the control temperature at the outside temperature of 25 degrees is 0.8 degrees, The control temperature lower limit value is smaller than the control temperature lower limit value of 1.3 degrees.

On the other hand, the control temperature upper limit value at 15 ° C is 0.8 ° C at the outside temperature of 15 ° C, the control temperature lower limit value at 15 ° C outside temperature is 0.4 ° C, the control temperature upper limit value at 5 ° C outside temperature is 0.4 ° C, The lower limit value becomes 0.1 degree.

As described above, according to the present embodiment, the on / off control of the compressor is nonlinearly controlled by using Equations (1) and (2) so that the actual in-cylinder temperature can follow the nonlinear variation, So that it can be achieved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, I will understand the point. Accordingly, the technical scope of the present invention should be defined by the following claims.

10:
20:
30: Outside temperature sensor
40: High Temperature Sensor
50: heater
60: Compressor

Claims (4)

A method for controlling a temperature inside a kimchi refrigerator according to an outside temperature,
Wherein the upper limit value and the lower limit value of the control temperature for controlling the inside temperature according to the outside air temperature have non-linearity.
The control method according to claim 1,
Is defined according to the expression ^{_{y on = Ax 2 + Bx +}} C,
Here, y _on is a temperature inside the compartment to turn on the compressor, x is the outside temperature, and A, B, and C are preset values.
The control method according to claim 1,
Is defined according to the expression ^{_{y off = Dx 2 + Ex +}} F,
Here, y _off is a temperature inside the compartment for _{turning off} the compressor, x is the outside air temperature, and D, E, and F are preset values.
The method according to claim 1,
The control temperature is an internal temperature for controlling on / off of the compressor,
Wherein the upper limit value is an internal temperature for controlling the on-time of the compressor, and the lower limit value is an internal temperature for controlling the off-time of the compressor.

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