JPH05288450A - Controller for freezing refrigerator - Google Patents

Abstract

PURPOSE:To carefully regulate temperature in a freezing refrigerator which can freeze/refrigerate and store food. CONSTITUTION:The controller for a freezing refrigerator comprises calculating means 23 for calculating temperature rising degree of a freezing chamber to calculate a temperature rising degree in the refrigerator, and atmospheric temperature detecting means 31 to detect an atmospheric temperature. A fuzzy inference processor 34 fuzzy logically calculates based on the temperature rising degree, the atmospheric temperature, and a control rule output from a memory 33, obtains a lowering width of a set temperature, and set temperature calculating means regulates the set temperature based on it. A compressor, a motor- driven damper are controlled, and when all freezing chamber temperature sensors or all cold storage chamber temperature sensors become a predetermined temperature or higher, the speed of a fan is controlled to be switched to a high speed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control rule based on an empirical rule and a membership function of fuzzy variables constituting the rule, in order to store frozen foods and refrigerated foods in a freezer-refrigerator in a fresh and long-term manner. The present invention relates to a control device for a freezer-refrigerator which infers an optimum range of setting temperature reduction in the freezer compartment and the refrigerator compartment and outputs the result.

[0002]

2. Description of the Related Art A freezer-refrigerator control device includes a damper, a fan and a compressor so as to control the temperature of each of a freezer compartment, a refrigerator compartment and a vegetable compartment of a refrigerator-freezer (hereinafter referred to as a refrigerator) at a set temperature. (For example, Japanese Utility Model Laid-Open No. 2-47424).

The temperature control of a conventional refrigerator-freezer control device will be described below with reference to the drawings.

FIG. 8 is a block diagram of a conventional refrigerator-freezer control device. In FIG. 8, reference numeral 1 denotes a refrigerator body, which is composed of an outer box 2, an inner box 3 and a urethane foam heat insulating material 4 formed in a space between the outer box 2 and the inner box 3, and three doors 5, 6 and 7 are provided in a front opening. Has been done. Doors 5, 6 and 7 are respectively a freezer compartment 8, a refrigerator compartment 9 and a vegetable compartment 1 of the refrigerator body 1.
It is arranged corresponding to the opening of 0.

A bottom plate 11 of the freezer compartment 8 and a top plate 12 of the refrigerating compartment 9
An evaporator 13 and a fan 14 are provided behind the evaporator 13 in the partition wall surrounded by. Further, ventilation paths 15 and 16 for introducing cooling air from the evaporator 13 into the respective compartments are formed at the backs of the freezing compartment 8 and the refrigerating compartment 9. Reference numeral 17 is a compressor, and 18 is an electric damper.

Reference numeral 19 is a freezer compartment temperature sensor. Two
Reference numeral 0 denotes a freezer compartment internal temperature detecting means for detecting the internal compartment temperature in the freezer compartment by the freezer compartment temperature sensor 19. Reference numeral 21 is a freezer compartment internal temperature determination means for determining whether the internal compartment temperature detected by the freezer compartment internal temperature detection means 20 is within the set temperature range of the freezer compartment. Reference numeral 22 is a compressor control means for controlling the compressor 17, and 23 is a fan control means for controlling the fan 14.

Reference numeral 24 is a refrigerating room temperature sensor. Two
Reference numeral 5 denotes a refrigerating compartment internal temperature detecting means for detecting a refrigerating compartment internal temperature by the refrigerating compartment temperature sensor 24. Reference numeral 26 is a refrigerating compartment internal temperature determining means for determining whether the refrigerating compartment internal temperature detected by the refrigerating compartment internal temperature detecting means 25 is within a set temperature range of the refrigerating compartment. An electric damper control unit 27 controls the electric damper 18.

The operation of the control device for the refrigerator / refrigerator constructed as described above will be described below with reference to FIG.

FIG. 9 (a) is a flow chart for explaining the temperature control of the freezer compartment 8 of the conventional refrigerator / freezer.
First, the freezer compartment internal temperature detection means 20 detects the internal compartment temperature Tfc in the freezer compartment by the freezer compartment temperature sensor 19 (Step).
p51). Then, the freezer compartment internal temperature determination means 21 determines that the internal compartment temperature Tfc is the set temperature of the freezer compartment (Tfcon: compressor,
Fan ON temperature, Tfcoff: Compressor, fan OFF
It is determined whether the temperature is within the temperature range (Step 52). Based on this determination, the compressor control unit 22 controls the compressor 17, and the fan control unit 23 controls the fan 14. (Step 53). As described above, the cold air having an appropriate temperature is sent to the freezing room 8 to control the temperature of the freezing room 8.

FIG. 9B is a flow chart for explaining the temperature control of the refrigerating compartment 9 of the conventional freezer / refrigerator.
First, the refrigerating compartment internal temperature detection means 25 detects the internal refrigerating temperature Tpc in the refrigerating compartment by the refrigerating compartment temperature sensor 24 (Step).
p61). Then, the refrigerator compartment internal temperature determination means 26 determines whether the refrigerator temperature Tpc is within the range of the preset temperature of the refrigerator compartment (Tpcon: opening temperature of electric damper, Tpcoff: closing temperature of electric damper) (Step 62). The electric damper control means 27 controls the electric damper 18 based on this determination. (St
ep63). From the above, the cold air of appropriate temperature is sent to the refrigerating compartment 9 to control the temperature of the refrigerating compartment 9.

[0011]

However, in the above-mentioned configuration, in the freezer compartment, the set temperature (Tfcon, Tf) of the freezer compartment, which is the basis for controlling the compressor and the fan, is set.
fcoff) is constant regardless of the internal temperature Tfc, and
In the refrigerating room, the set temperature (Tpcon, Tpcoff) that is the basis for controlling the electric damper is constant regardless of the temperature Tpc in the refrigerator, and thus it is not possible to perform fine temperature control, for example, in summer. When you want to pack food or cool it quickly due to a sudden visitor etc., it is not possible to optimally control the temperature in both the freezing room and the refrigerating room, and even if the rotation speed of the fan opens and closes the temperature inside the refrigerator. Since the rotation was constant, there was a problem that it was not possible to suppress the temperature rise in the refrigerator.

The present invention solves the above problems,
Depending on the temperature rise inside the freezer compartment and the refrigerator compartment and the outside air temperature, the reduction range of the set temperature of the freezer compartment and the refrigerator compartment is calculated, and the set temperature is adjusted respectively, and all the inside temperature sensors An object of the present invention is to provide a control device for a refrigerator / freezer capable of performing fine temperature control by switching the fan to high rotation when the temperature rises.

[0013]

In order to solve the above-mentioned problems, a control device for a refrigerator / freezer according to the present invention, in a freezer compartment, has a plurality of freezer compartment temperature sensors, a freezer compartment temperature detection means, and a freezer compartment. Stores the temperature of each freezer compartment temperature sensor when the previous compressor started operating, and determines whether each freezer compartment temperature sensor exceeds a certain temperature for this temperature. Means, an outside air temperature sensor, an outside air temperature detecting means, and an output of the freezer compartment internal temperature detecting means to indicate the degree of temperature rise inside the refrigerator from the temperature of each freezer compartment temperature sensor when the previous compressor starts operating. A freezing room temperature increase degree calculating means for calculating; a first memory for storing a control rule based on an empirical rule for obtaining a reduction range of the set temperature of the freezing room; a temperature increase degree in the refrigerator; and an outside air temperature, From the memory A first fuzzy inference processor that performs a fuzzy logic operation based on the control rule that is output to calculate the reduction range of the set temperature of the freezing room, and a freezing chamber that calculates the set temperature of the freezing room from the reduction range of the set temperature. Based on the set temperature calculation means and the set temperature calculated by the freezer compartment temperature calculation means, the compressor control means for controlling the compressor and all the freezer compartment temperature sensors, when the temperature exceeds a certain temperature, the rotation speed of the fan is determined. And fan control means for switching to high rotation.

In the refrigerating compartment, a plurality of refrigerating compartment temperature sensors, a refrigerating compartment internal temperature detecting means, and a temperature of each refrigerating compartment temperature sensor when the electric damper of the refrigerating compartment internal compartment is opened last time. The temperature of the refrigerating compartment stored in the refrigerating compartment is determined based on the stored temperature and the output of the refrigerating compartment temperature detecting means determines whether or not the temperature of each refrigerating compartment temperature sensor exceeds a certain temperature. A refrigerating room temperature increase degree calculating means for calculating the degree of temperature rise inside the refrigerator from the temperature of each refrigerating room temperature sensor, and a second memorizing control rule based on an empirical rule for obtaining a reduction range of the set temperature of the refrigerating room. Memory of
A fuzzy logic operation is performed on the basis of the degree of temperature rise in the refrigerator, the outside air temperature detected by the outside air temperature detecting means, and the control rule retrieved from the memory to calculate the amount of decrease in the set temperature of the refrigerating compartment. No. 2 fuzzy inference processor, refrigerating room setting temperature calculating means for calculating the setting temperature of the refrigerating room from the range of decrease of the setting temperature, and electric motor for controlling the electric damper from the setting temperature calculated by the refrigerating room setting temperature calculating means. A damper control means and a fan control means for switching the rotation speed of the fan to a high rotation speed when all the refrigerating compartment temperature sensors have reached a certain temperature or higher.

Further, in controlling the freezing compartment and the refrigerating compartment, a priority means for giving priority to the control of the freezing compartment is provided.

[0016]

According to the present invention, according to the above-mentioned structure, the temperature rise of the inside of the refrigerator calculated by the temperature rise calculating means of each of the freezing compartment and the refrigerating compartment, the outside air temperature detected by the outside air temperature detecting means, and the temperature are taken out from the memory. Based on the control rule, the fuzzy inference processor performs fuzzy logic operation to obtain the reduction range of the set temperature in each of the freezer compartment and the refrigerator compartment. In addition, when all the temperature sensors in each room are above a certain temperature, the fan speed is switched to high speed, so that the inside of the refrigerator is cooled even when the door is opened and closed to cause clogging due to frost on the cooler. Can be circulated to suppress the temperature rise in the refrigerator. Therefore, each set temperature is adjusted according to the amount of reduction obtained above, and based on this set temperature, the compressor, fan, and electric damper are controlled. Key control can be performed.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. Further, in the figure, the same parts as those in the conventional example are designated by the same reference numerals, and the description thereof will be omitted.

FIG. 1 is a block diagram showing the configuration of a control unit for a freezing compartment of a freezer-refrigerator according to the first embodiment of the present invention, and FIG. 2A is a inside of the freezing compartment according to the first embodiment of the present invention. 2B is a graph showing the membership function of the fuzzy variable with respect to the temperature rise degree, FIG. 2B is a graph showing the membership function of the fuzzy variable with respect to the outside air temperature in the first embodiment of the present invention, and FIG. 3 is the graph of the present invention. FIG. 4 is a flow chart for explaining the operation in the first embodiment, and FIG. 4 is a flow chart for explaining the fuzzy inference procedure in the first embodiment of the present invention.

In FIG. 1, reference numeral 30 is a control device for the freezer compartment, which includes temperature detectors 20 and 51 in the freezer compartment, temperature determiner 21 in the freezer compartment, compressor controller 22, fan controller 23, and outside air temperature detector. It comprises means 31, freezing room temperature rise degree calculating means 32, first memory 33, first fuzzy inference processor 34, and freezing room set temperature calculating means 35.

The outside air temperature detecting means 31 detects the outside air temperature outside the refrigerator by the outside air temperature sensor 28. The freezing compartment temperature increase degree calculating means 32 calculates the temperature rise degree in the freezer compartment from the output of the freezing compartment temperature detecting means 20.

The first memory 33 stores a control rule based on an empirical rule for obtaining the reduction range of the set temperature of the freezer. The first fuzzy inference processor 34 uses the temperature increase degree calculated by the freezer compartment temperature increase degree calculating means 32,
A fuzzy logic operation is performed on the basis of the outside air temperature detected by the outside air temperature detecting means 31 and the control rule fetched from the memory 33 to calculate the amount of decrease in the set temperature of the freezer compartment. Further, the freezer compartment set temperature calculation means 35 calculates the set temperature of the freezer compartment from the range of decrease in the set temperature calculated by the first fuzzy inference processor 34.

The operation of the control device for the freezer compartment of the freezer-refrigerator configured as described above will be described below with reference to FIGS. 1 to 4.

First, the freezer compartment internal temperature detecting means 20 and 5
1 detects the temperature Tfc in the freezer compartment by the freezer compartment temperature sensors 19 and 50.
The temperatures Tfcon1 and Tfcon2 at the time of starting the operation of the compressor 17 for each temperature Tfc1 and Tfc2 are stored (S
step1). The freezer compartment temperature detection means 20 and 51
Detects the temperature Tfc in the freezer compartment by the freezer compartment temperature sensors 19 and 50 (Step 2). It is determined whether or not the temperatures Tfc1 and Tfc2 of the freezer compartment sensors 19 and 50 have exceeded the temperatures Tfcon1 and Tfcon2 of the respective freezer compartment temperature sensors 19 and 50 at the start of operation of the compressor 17 (Step 3), and the compressors for each time are determined. If the temperatures Tfcon1 and Tfcon2 at the time of starting operation of 17 are not exceeded,
Based on this set temperature Tfcon1, the compressor control means 2
2 controls the compressor 17, and the fan control means 23 controls the fan 14 (Step 4).

When the value of the internal temperature Tfc exceeds the temperatures Tfcon1 and Tfcon2 of the freezing room temperature sensors 19 and 50 at the time of starting the operation of the compressor 17, the freezing room temperature rise calculating means 32 As shown in, the temperature rises Tfcup1 and Tfcup2 of the freezer are calculated (Step
5).

Tfcup = Tfc-Tfcon Further, the outside air temperature detecting means 31 detects the outside air temperature Tout outside the refrigerator by the outside air temperature sensor 28 (Step).
6).

Next, the larger one of the calculated temperature increases Tfcup1 and Tfcup2 and the outside air temperature Tout are input to the first fuzzy inference processor 34 (Step 7).
The fuzzy inference processor 34 uses the first memory 3 in advance.
The control rule stored in No. 3 is taken out, and the decrease width ΔTfcoff of the set temperature of the freezer is obtained by fuzzy reasoning (Step 8). From this, the freezer compartment set temperature calculation means 35 determines the set temperature Tf of the freezer compartment from the reduction width ΔTfcoff of the set temperature obtained by the fuzzy inference processor 34.
Calculate coff (compressor / fan OFF temperature) (Step 9). Then, based on the set temperature Tfcoff, the compressor control means 22 controls the compressor 17, and the fan control means 23 controls the fan 14.

Here, the fuzzy inference for obtaining the reduction range of the set temperature for optimally controlling the temperature of the freezer is executed based on the following control rule.

The control rules adopted in this embodiment are the following nine language rules. For example, language rule 11: If the temperature rise is small and the outside air temperature is low, decrease the set temperature by a small amount.

Language rule 12: If the temperature rise is small and the outside air temperature is medium, decrease the set temperature by a small amount.

Language rule 13: If the degree of temperature rise is small and the outside air temperature is high, decrease the set temperature by a very small amount.・ ・ ・ Language rule 17: If the temperature rise is large and the outside air temperature is low, increase the set temperature greatly.

Language rule 18: If the temperature rise is large and the outside air temperature is medium, increase the set temperature decrease range.

Language rule 19: If the temperature rise is large and the outside air temperature is high, increase the set temperature decrease range. Etc.

This is because the temperature rise increases as the amount of food fed into the freezer increases. Therefore, the higher the temperature rise, the higher the temperature inside the chamber, so the set temperature must be greatly lowered. The lower the outside air temperature, the faster the temperature of the internal temperature sensor will drop compared to the temperature of the food, and the set temperature will be reached before the food cools.Therefore, it is necessary to further lower the set temperature. The language rules are Therefore, the language rule is a control rule for the range of decrease in the set temperature that allows the optimum temperature control of the freezer compartment, which the inventor obtained from a large number of experimental data,
The relationship between the temperature rise degree T and the outside air temperature AT is shown in Table 1.

[0034]

[Table 1]

(Table 1) is a table showing the relationship of the control rules, in which the temperature increase degree T is three steps in the lateral direction (BT = large, MT =
The outside air temperature AT is divided into three stages (HAT = high, MAT = medium, LAT = low) in the vertical direction, and the temperature rise degree T and the outside air temperature AT are divided. At each intersecting position, there is arranged an optimal reduction range ΔT of the set temperature of the freezer compartment corresponding to the temperature increase degree T and the outside air temperature AT.

Further, the language rule is based on the memory 33 of FIG.
When it is stored in, the control rule is as follows. The control rules adopted in this embodiment are nine.

Control Rule 11: IF T is ST and AT is LAT THEN ΔT is S Control Rule 12: IF T is ST and AT is MAT THEN ΔT is S Control Rule 13: IF T IS ST and AT is HAT THEN ΔT is VS ··· Control rule 17: IF T is BT and AT is LAT THEN ΔT is VB control rule 18: IF T is BT and AT is MAT THEN ΔT isB control rule 19: IF T is BT and AT is HAT THEN ΔT is B The control rules 11, 12, ..., 19 have the temperature increase degree T, the outside air temperature AT, and the decrease range ΔT of the set temperature of the freezer compartment as shown in (Table 1). The temperature rise is not For the actually measured temperature rise Tfcup and the outside air temperature Tout in the middle of each stage of T and the outside air temperature AT, the degree to which the antecedent part (IF part) of the control rule is satisfied is calculated, and the degree is calculated. It is necessary to estimate the reduction range ΔTfcoff of the set temperature according to the above. Therefore, in this embodiment, the degree is calculated by using the membership function of the fuzzy variable for the temperature increase degree T and the outside air temperature AT.

FIG. 2A shows membership functions μST (Tfcup), μMT (Tfcup), μBT of the fuzzy variables ST, MT, BT with respect to the temperature rise T in the freezer compartment.
2B shows membership functions μLAT (Tout), μMAT (Tou) of the fuzzy variables LAT, MAT, HAT with respect to the outside air temperature AT.
t) and μHAT (Tout).

The fuzzy inference executed by the fuzzy inference processor 34 uses the control rules 1, rule 2, ..., Rule 9 and the membership functions of FIGS. 2A and 2B to perform fuzzy logic operation. Calculate the range of decrease in the set temperature of the freezer.

The procedure of fuzzy inference which is Step 7 of FIG. 3 will be described below with reference to the flowchart of FIG.

In Step 10, the fuzzy inference processor 34 uses the membership function of the fuzzy variable for the temperature rise degree Tfcup and the outside air temperature Tout, and the membership value at the temperature rise degree Tfcup and the outside air temperature Tout (displayed as M value in the figure). ) Is calculated.

In Step 11, the obtained temperature rise degree T
The degree to which the membership values of the fuzzy variables with respect to fcup and the outside air temperature Tout satisfy the antecedent part of each of the nine rules is calculated by the synthesis method as follows.

In the figure, the fuzzy variable for the temperature rise is indicated by A, and the fuzzy variable for the outside air temperature is indicated by B.

Control Rule 11: h11 = μST (Tfcup) ∩μLAT (Tout) = μST (Tfcup) × μLAT (Tout)-(1) Control Rule 12: h12 = μST (Tfcup) ∩μMAT (Tout) = μST (Tfcup) × μMAT (Tout) −−− (2) Control Rule 13: h13 = μST (Tfcup) ∩μHAT (Tout) = μST (Tfcup) × μHAT (Tout) --- (2) ... Rule 17: h17 = μBT (Tfcup) ∩μLAT (Tout) = μBT (Tfcup) × μLAT (Tout)-(7) Control Rule 18: h18 = μBT (Tfcup) ∩μMAT (Tout) = μBT (Tfcup) × μMAT (Tout) −−− (8) Control Rule 19: h19 = μBT (Tfcup) ∩μHAT (Tout) = μBT (Tfcup) × μHAT (Tout) −−− (9) Equation (1) is the above Tfcup. Is warm Area S with respect to the degree of increase T
The proposition that T enters and Tout enters the area LAT for the outside air temperature AT is satisfied by the product of the ratio of Tfcup entering ST and the ratio of Tout entering LAT, that is, the antecedent of the control rule 11. The part represents that the ratio is h11. Similarly, equation (2), ...
······················ (9), the antecedent part is established at the rate of h2, ..., H9, respectively.

At Step 12, the degree of decrease ΔTfcoff of the set temperature of the freezer compartment at the temperature increase degree Tfcup and the outside air temperature Tout is obtained by the membership function of the execution part of the control rule as follows. Decrease in set temperature △ Tfcoff
Uses the height method, which is one of the one-point conversion methods, and the proportions h11, h12, ...
The value of the weighted average of h19 is calculated as shown in (Equation 1).

[0046]

[Equation 1]

As a result, the range of decrease in the set temperature ΔTfcoff
Is required. Therefore, in this embodiment, since the degree of temperature rise in the freezer compartment and the outside air temperature are used as the control parameters, fine control is possible. Further, since the control rule is based on human experience, the temperature control of the freezer can be controlled at the optimum set temperature. Further, when all the freezing room temperature sensors 19 and 50 have reached a certain temperature or higher, that is, when a large amount of frost is generated on the cooler 13 due to the opening and closing of the doors and the cooler 13 is clogged, the fan 14 is turned on. The high rotation speed can increase the amount of air sent from the cooler 13 to the inside of the refrigerator, and can suppress the temperature rise inside the refrigerator. Here, the case where all the freezer compartment temperature sensors 19, 50 have reached a certain temperature or higher is because when all the freezer compartment temperature sensors 19, 50 do not rise, the cooler 13 causes clogging due to frost formation. This is because even if the fan 14 is rotated at a high speed in such a case, the evaporation temperature of the cooler 13 rises and the cooling effect is not improved.

Next, another embodiment will be described with reference to the drawings. Further, in the drawing, the same components as those of the conventional example and the first embodiment are designated by the same reference numerals, and detailed description thereof will be omitted.

FIG. 5 is a block diagram showing the construction of a control unit for a refrigerating room of a refrigerator / freezer according to another embodiment of the present invention.
Is a graph showing a membership function of a fuzzy variable with respect to the temperature rise inside the refrigerator in another embodiment of the present invention, and FIG. 7 is a flow chart for explaining the operation in another embodiment of the present invention.

In FIG. 5, reference numeral 40 denotes a refrigerating compartment control device, which is a refrigerating compartment interior temperature detecting means 25, a refrigerating compartment interior temperature determining means 26, an electric damper control means 27, a fan control means 23, and an outside air temperature detecting means. 31, a refrigerating room temperature rise calculating means 42, a second memory 43, a second fuzzy inference processor 44, and a refrigerating room set temperature calculating means 45.

The refrigerating compartment temperature increase degree calculating means 42 calculates the temperature rise degree inside the refrigerating room from the output of the refrigerating compartment inside temperature detecting means 25.

The second memory 43 stores a control rule based on an empirical rule for obtaining the reduction range of the set temperature of the refrigerating room. The second fuzzy inference processor 44 uses the temperature increase degree calculated by the refrigerating room temperature increase degree calculating means 42,
A fuzzy logic operation is performed on the basis of the outside air temperature detected by the outside air temperature detecting means 31 and the control rule fetched from the memory 43 to calculate the reduction range of the set temperature of the refrigerating room. Further, the refrigerating room set temperature calculation means 45 calculates the set temperature of the refrigerating room from the reduction range of the set temperature calculated by the second fuzzy inference processor 44.

Regarding the control device for the refrigerating room of the freezer-refrigerator configured as described above, the following will be described with reference to FIGS.
The operation will be described with reference to FIG.

First, the temperature detecting means 25 and 5 in the refrigerator compartment
Numeral 3 detects the temperature Tpc inside the refrigerating compartment by means of the refrigerating compartment temperature sensors 24 and 52, and the refrigerating compartment temperature sensors 24 and 52 respectively.
The temperatures Tpcon1 and Tpcon2 when the electric damper 18 is opened are stored for each temperature Tpc1 and Tpc2 (Step).
20). The refrigerating compartment temperature detecting means 25 and 53 detect the refrigerating compartment temperature Tpc by the refrigerating compartment temperature sensors 24 and 52 (Step 21). The electric damper 1
Temperature T of each cold room temperature sensor 24 and 52 when opening 8
Refrigerator sensors 24 and 52 for pcon1 and Tpcon2
It is determined whether the temperatures Tpc1 and Tpc2 of the
(Tep22), temperature Tpc when the electric damper is opened every time
Unless it exceeds on1 and Tpcon2, this set temperature Tpc
The electric damper control means 27 controls the electric damper 18 based on on1 (Step 23). When the value of the in-compartment temperature Tpc exceeds the temperatures Tpcon1 and Tpcon2 of the refrigerating compartment temperature sensors 24 and 52 when the electric damper 18 is opened, the refrigerating compartment temperature increase degree calculating means 42 operates as follows. Then, the temperature rise degrees Tpcup1 and Tpcup2 of the refrigerating compartment are calculated (Step 24).

Tpcup = Tpc-Tpcon Further, the outside air temperature detecting means 31 detects the outside air temperature Tout outside the refrigerator by the outside air temperature sensor 28 (Step 2).
5).

Next, the larger one of the calculated temperature increases Tpcup1 and Tpcup2 and the outside air temperature Tout are input to the second fuzzy inference processor 44 (Step 2).
6). In the fuzzy inference processor 44, the control rule stored in advance in the second memory 43 is taken out, and the reduction range ΔTpcof of the set temperature of the refrigerating room is obtained by fuzzy inference.
Find f (Step 27). From this, the refrigerating room set temperature calculation means 45 calculates the set temperature Tpcoff (close temperature of the electric damper) of the refrigerating room from the reduction width ΔTpcoff of the set temperature obtained by the fuzzy inference processor 44 (S).
(Step 28). Then, based on this set temperature Tpcoff,
The electric damper control means 27 controls the electric damper 18.

Here, the fuzzy inference for obtaining the reduction range of the set temperature for optimally controlling the temperature of the refrigerating room is executed based on the following control rule.

The control rules adopted in this embodiment are the following nine language rules. For example, language rule 21: If the temperature rise is small and the outside air temperature is low, decrease the set temperature by a very small amount.

Language rule 22: If the temperature rise is small and the outside air temperature is medium, decrease the set temperature by a small amount.

Language rule 23: If the temperature rise is small and the outside air temperature is high, decrease the set temperature by a small amount.・ ・ ・ Language rule 27: If the temperature rise is large and the outside air temperature is low, increase the set temperature.

Language Rule 28: If the temperature rise is large and the outside air temperature is medium, increase the set temperature decrease range.

Language rule 29: If the temperature rise is large and the outside air temperature is high, increase the set temperature by a large amount. Etc.

This is because the temperature rise increases as the amount of food fed into the refrigerating chamber increases. Therefore, the higher the temperature rise, the higher the temperature inside the refrigerator. Therefore, it is necessary to greatly lower the set temperature. It is a rule obtained from experience that the lower the outside air temperature, the higher the risk of freezing of food in the refrigerating room, and therefore it is necessary to reduce the set temperature decrease amount.

Therefore, the above-mentioned language rule is a control rule for the degree of decrease of the set temperature that allows the optimum temperature control of the refrigerating room, which is obtained by the inventor from a large number of experimental data. The relationship between the outside air temperature AT and the outside air temperature AT is as shown in Table 2.

[0065]

[Table 2]

(Table 2) is a table showing the relation of the control rules, and the details are as described in the first embodiment. At a position where the temperature increase degree T and the outside air temperature AT intersect with each other, an optimal reduction range ΔT of the set temperature of the refrigerating room corresponding to the temperature increase degree T and the outside air temperature AT is arranged.

Further, the language rule is stored in the memory 43 of FIG.
When it is stored in, the control rule is as follows. The control rules adopted in this embodiment are nine.

Control Rule 21: IF T is ST and AT is LAT THEN ΔT is VS Control Rule 22: IF T IS ST and AT is MAT THEN ΔT is S Control Rule 23: IF T IS ST and AT is HAT THEN ΔT is S ··· Control rule 27: IF T is BT and AT is LAT THEN ΔT is B control rule 28: IF T is BT and AT is MAT THEN ΔT is B control rule 29: IF T is BT and AT is HAT THEN ΔT is VB The control rules 21, 22, ..., 29 have the temperature increase degree T, the outside air temperature AT, and the decrease amount ΔT of the set temperature of the refrigerating room as shown in (Table 2). The temperature rise is not For the actually measured temperature rise degree Tpcup and the outside air temperature Tout in the middle of each stage of T and the outside air temperature AT, the degree to which the antecedent part (IF part) of the control rule is satisfied is calculated, and the degree is calculated. Estimate the amount of decrease ΔTpcoff of the set temperature according to the estimation. Therefore, in the present embodiment, the degree is calculated by using the membership function of the fuzzy variable with respect to the temperature rise degree T and the outside air temperature AT, as in the first embodiment.

FIG. 6 shows membership functions μST (Tpcup), μMT (Tpcup), μBT (Tpcu) of fuzzy variables ST, MT, and BT with respect to the temperature rise degree T in the refrigerator.
p), and the membership function of the fuzzy variable with respect to the outside air temperature AT is as shown in FIG. 2 (b).

In the fuzzy inference executed by the fuzzy inference processor 44, a fuzzy logic operation is performed by using the control rules 21, ..., 29 and the membership function of FIGS. 6 and 2B to set the refrigerating room. Calculate the temperature reduction range.

The procedure is similar to that described in the first embodiment, and based on the flowchart of FIG. 4, Step of FIG.
The procedure of fuzzy inference that is p27 will be described.

In Step 10, the fuzzy inference processor 44 uses the membership function of the fuzzy variable for the temperature rise degree Tpcup and the outside air temperature Tout, and the membership value at the temperature rise degree Tpcup and the outside air temperature Tout (displayed as M value in the figure). ) Is calculated.

In Step 11, the obtained temperature rise degree T
The degree to which the membership values of the fuzzy variables for pcup and the outside air temperature Tout satisfy the antecedent part of each of the nine rules is calculated by the synthesis method as follows.

In the figure, the fuzzy variable with respect to the degree of temperature rise is indicated with A, and the fuzzy variable with respect to the outside air temperature is indicated by B.

Control Rule 21: h21 = μST (Tpcup) ∩μLAT (Tout) = μST (Tpcup) × μLAT (Tout)-(1) Control Rule 22: h22 = μST (Tpcup) ∩μMAT (Tout) = μST (Tpcup) × μMAT (Tout) −−− (2) Control Rule 23: h23 = μST (Tpcup) ∩μHAT (Tout) = μST (Tpcup) × μHAT (Tout) −−− (2) Rule 27: h27 = μBT (Tpcup) ∩μLAT (Tout) = μBT (Tpcup) × μLAT (Tout)-(7) Control Rule 28: h28 = μBT (Tpcup) ∩μMAT (Tout) = μBT (Tpcup) × μMAT (Tout) --- (8) Control Rule 29: h29 = μBT (Tpcup) ∩μHAT (Tout) = μBT (Tpcup) × μHAT (Tout) --- (9) Equation (1) is the above Tpcup. Is warm Area S with respect to the degree of increase T
The proposition that T enters and Tout enters the area LAT for the outside air temperature AT is satisfied by the product of the ratio of Tpcup to ST and the ratio of Tout to LAT, that is, the antecedent of the control rule 21. The part indicates that the ratio is satisfied at the rate of h21. Similarly, equation (2), ...
In the case of the control rules 22, ..., 29, which are equations (9), it is indicated that the antecedent part is satisfied at the ratio of h22 ,.

At Step 12, the degree of decrease ΔTpcoff of the set temperature of the refrigerating room at the temperature increase degree Tpcup and the outside air temperature Tout is obtained by the membership function of the execution part of the control rule as follows. Decrease in set temperature △ Tpcoff
Is calculated using the height method as a value of the weighted average of the proportions h21, h22, ..., H29 in which the antecedent part of each control rule holds, as shown in (Equation 2). Also, when all the refrigerating room temperature sensors 24, 52 have reached a certain temperature or higher,
That is, a large amount of frost is formed on the cooler 13 by opening and closing the door,
When the cooler 13 becomes clogged, the fan 14 is rotated at a high speed to increase the amount of air sent from the cooler 13 to the inside of the refrigerator and suppress the rise in the inside temperature. Here, all the refrigerating compartment temperature sensors 24 and 52 are set to have a certain temperature or more. When all the refrigerating compartment temperature sensors do not rise, the cooler 13 is not clogged due to frost formation. This is because even if the fan 14 is rotated at a high speed at this time, the evaporation temperature of the cooler 13 rises and the cooling effect is improved in the city.

[0077]

[Equation 2]

As a result, the set temperature decrease range ΔTpcoff
Is required. Therefore, in this embodiment, since the degree of temperature rise in the refrigerating compartment and the outside air temperature are used as the control parameters, fine control is possible. Further, since the control rule is based on human experience, temperature control of the refrigerating room can be performed at the optimum set temperature.

[0079]

As described above, according to the present invention, in a freezer / refrigerator capable of freezing / refrigerating and storing food, in the freezing room, a plurality of freezing room temperature sensors and freezing room internal temperature detecting means are provided. , The temperature of each freezer compartment temperature when the previous compressor started operating is stored, and it is judged whether or not each sensor exceeds a certain temperature against this temperature. Means, an outside air temperature sensor, an outside air temperature detecting means, and an output of the freezer compartment internal temperature detecting means to indicate the degree of temperature rise inside the refrigerator from the temperature of each freezer compartment temperature sensor when the previous compressor starts operating. A freezing room temperature increase degree calculating means for calculating; a first memory for storing a control rule based on an empirical rule for obtaining a reduction range of the set temperature of the freezing room; a temperature increase degree in the refrigerator; and an outside air temperature, Is it the memory A first fuzzy inference processor that performs a fuzzy logic operation based on the extracted control rule to calculate the reduction range of the set temperature of the freezing chamber, and a freezing chamber setting that calculates the set temperature of the freezing chamber from the reduction range of the set temperature When the temperature calculating means and the set temperature calculated by the freezing room set temperature calculating means, the compressor controlling means for controlling the compressor and all the freezing room temperature sensors reach a certain temperature or higher, the fan rotation speed is increased. And fan control means for switching to rotation.

Further, in the refrigerating compartment, a plurality of refrigerating compartment temperature sensors, refrigerating compartment internal temperature detecting means, and refrigerating compartment internal temperature sensors are used to measure the temperature of each refrigerating compartment temperature sensor when the previous electric damper was opened. Stored in the refrigerating room temperature determining means for deciding whether or not each sensor exceeds a certain temperature with respect to this temperature, and each freezing room when the previous electric damper is opened by the output of the refrigerating room temperature detecting means. A refrigerating room temperature increase degree calculating means for calculating a temperature rise degree in the refrigerator from the temperature of the temperature sensor; and a second memory for storing a control rule based on an empirical rule for obtaining a reduction range of the set temperature of the refrigerating room. A degree of decrease in the set temperature of the refrigerating room is calculated by performing a fuzzy logic operation based on the degree of temperature rise in the refrigerator, the outside air temperature detected by the outside air temperature detecting means, and the control rule retrieved from the memory. First Fuzzy inference processor, a refrigerating room set temperature calculating means for calculating the set temperature of the refrigerating room from the reduction range of the set temperature, and an electric damper for controlling the electric damper from the set temperature calculated by the refrigerating room set temperature calculating means. A control means and a fan control means for switching the rotation speed of the fan to a high rotation speed when all the refrigerating compartment temperature sensors reach a certain temperature or higher.

Further, in controlling the freezing compartment and the refrigerating compartment, a priority means for giving priority to the control of the freezing compartment is provided. With this configuration, based on the temperature rise degree in the refrigerator calculated by the temperature rise degree calculating means of each of the freezer compartment and the refrigerating compartment, the outside air temperature detected by the outside air temperature detecting means, and the control rule retrieved from the memory. , Fuzzy logic operation by fuzzy inference processor, freezer,
It is necessary to reduce the set temperature of each refrigerator compartment. In addition, if multiple temperature sensors are provided in each room to detect the temperature of the freezing room and the refrigerating room in detail, even if the temperature of each temperature sensor at the time of stability varies Memorizes the temperature of each sensor at the start of each compressor operation, and the temperature when the electric damper opens each time in the refrigerating room, and in order to calculate the temperature rise degree based on this temperature, It is possible to absorb the variation of the above and input an appropriate temperature rise value to the fuzzy inference processor. Therefore, each set temperature is adjusted according to the lowering width obtained above, and based on this set temperature, the compressor is controlled, the fan is controlled, the electric damper is controlled, and all the freezer compartment temperature sensors or all When the temperature sensor in the refrigerator compartment exceeds a certain temperature, that is, when a large amount of frost is generated on the cooler due to the opening and closing of the door and the cooler becomes clogged, the fan is rotated at high speed By controlling the temperature rise in the freezer / refrigerator by increasing the amount of air sent to the refrigerator, the optimal temperature control of the freezer / refrigerator can be stored in the freezer / refrigerator based on empirical rules. Control can be performed.

For example, when a large amount of food is packed in the summer, the temperature rise of the existing food already stored in the refrigerator can be minimized and the raised temperature can be returned to the original freezing temperature in a short time. it can.

[Brief description of drawings]

FIG. 1 is a block diagram of a control device for a freezer compartment of a refrigerator / freezer showing an embodiment of the present invention.

FIG. 2 (a) is a graph showing a membership function of a fuzzy variable with respect to a temperature rise in the freezer compartment. FIG. 2 (b) is a graph showing a membership function of a fuzzy variable with respect to an outside air temperature.

FIG. 3 is a flowchart for explaining the operation in FIG.

FIG. 4 is a flowchart for explaining a fuzzy inference procedure in FIG.

FIG. 5 is a block diagram of a control device for a refrigerating room of a refrigerator-freezer according to another embodiment of the present invention.

FIG. 6 is a graph showing a membership function of fuzzy variables with respect to a temperature rise inside the refrigerator in FIG.

7 is a flowchart for explaining the operation in FIG.

FIG. 8 is a block diagram of a conventional controller for a refrigerator-freezer.

FIG. 9 is a flowchart for explaining the operation in the conventional example.

[Explanation of symbols]

 8 Freezing Room 9 Refrigerating Room 19 Freezing Room Temperature Sensor 20 Freezing Room Internal Temperature Detection Means 21 Freezing Room Internal Temperature Judging Means 22 Compressor Controlling Means 23 Fan Controlling Means 24 Refrigerating Room Temperature Sensors 25 Cold Refrigerating Room Temperature Detecting Means 26 Refrigeration Room temperature determination means 27 Electric damper control means 28 Outside air temperature sensor 30 Freezing room control device 31 Outside air temperature detection means 32 Freezing room temperature rise calculation means 33 First memory 34 First fuzzy inference processor 35 Freezing room setting Temperature calculating means 40 Refrigerating room control device 42 Refrigerating room temperature rise calculating means 43 Second memory 44 Second fuzzy inference processor 45 Refrigerating room set temperature calculating means 50 Freezing room temperature sensor 51 Freezing room temperature detecting means 52 Refrigerating room temperature sensor 53 Temperature measuring means in the refrigerating room

Claims (2)

[Claims] 1. A plurality of freezer compartment temperature sensors provided in the freezer compartment, a freezer compartment internal temperature detection means for detecting the temperature in the freezer compartment by the freezer compartment temperature sensors, and the freezer compartment internal temperature detection means. The temperature detected by memorize the temperature of each freezer compartment temperature sensor when the previous compressor started operation, and determine whether each freezer compartment temperature sensor has exceeded a certain temperature against this temperature. The inside temperature determination means, the outside air temperature sensor provided outside the freezer-refrigerator, the outside air temperature detection means for detecting the outside air temperature outside the freezer-refrigerator by the outside air temperature sensor, and the output of the freezer compartment temperature detection means To calculate the degree of temperature rise in the freezer compartment from the temperature of each freezer compartment temperature sensor when the compressor starts operating, and to determine the amount of decrease in the set temperature of the freezer compartment A first memory for storing a control rule based on the empirical rule, a temperature increase degree calculated by the freezer compartment temperature increase degree calculation means, an outside air temperature detected by the outside air temperature detection means, and a memory extracted from the memory. Based on the control rule, the first fuzzy inference processor that performs a fuzzy logic operation to calculate the reduction range of the set temperature of the freezing room, and the reduction range of the set temperature calculated by the fuzzy inference processor The freezing room set temperature calculating means for calculating the set temperature, the compressor control means for controlling the compressor from the set temperature calculated by the freezing room set temperature calculating means, and all the freezing room temperature sensors have exceeded a certain temperature. A control device for a refrigerator-freezer, comprising: a fan control means for switching the rotation speed of the fan to a high rotation speed. 2. A plurality of refrigerating compartment temperature sensors provided in the refrigerating compartment, a refrigerating compartment internal temperature detecting means for detecting a temperature in the refrigerating compartment by the refrigerating compartment temperature sensor, and the refrigerating compartment internal temperature detecting means. The temperature detected by memorizes the temperature of each cold room temperature sensor when the previous electric damper opened,
Refrigerating room temperature sensor for determining whether or not each refrigerating room temperature sensor exceeds a certain temperature for this temperature, an outside air temperature sensor provided outside the freezer-refrigerator, and an outside air outside the freezer-refrigerator by the outside air temperature sensor. An outside air temperature detecting means for detecting the temperature and a refrigerating compartment temperature for calculating the degree of temperature increase in the refrigerator from the temperature of each refrigerating compartment temperature sensor when the electric damper is opened last time by the output of the refrigerating compartment inside temperature detecting means. An ascending degree calculating means, and a second memory for storing a control rule based on an empirical rule for obtaining a reduction range of the set temperature of the refrigerating room,
Based on the temperature increase degree calculated by the refrigerating room temperature increase degree calculating means, the outside air temperature detected by the outside air temperature detecting means, and the control rule fetched from the memory, a fuzzy logic operation is performed for the refrigerating room temperature. A second fuzzy inference processor for calculating the set temperature decrease range, a refrigerating room set temperature calculating means for calculating the set temperature of the refrigerating room from the set temperature decrease range calculated by the fuzzy inference processor, and the refrigerating room From the set temperature calculated by the set temperature calculation means, the electric damper control means for controlling the electric damper and the fan control means for switching the rotation speed of the fan to a high rotation speed when all the refrigerating compartment temperature sensors reach a certain temperature or higher. A control device for a refrigerator / freezer, comprising: