JPH08261624A - Control device for freezing refrigerator - Google Patents

Abstract

PURPOSE: To perform minute temperature control in a freezing refrigerator capable of storing foodstuffs in a freezing/cold storage mode. CONSTITUTION: An arithmetic operation means 32 which computes respectively the rate of increase of temperature in a freezing compartment and a cold storage compartment and an open air temperature detection means 33 are installed while a fuzzy inherence processor 35 performs a logical operation based on a control rule picked up from the rate of increased of temperature and the open air temperature and a memory 34, thereby determining a lower referential of a setting temperature. The setting temperature of a setting temperature arithmetic operation means 36 is adjusted based on this allowance, thereby controlling the opening of a motor-driven damper and on/off operations of a compressor based on the result and the rotary speeds of the compressor and a fan based on the lower referential of the setting temperature.

Description

Detailed Description of the Invention

[0001]

BACKGROUND 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 refrigerator / freezer in which the optimum rotation speeds of the compressor and the fan are inferred and the rotation speed of the compressor, the rotation speed of the fan, and the opening / closing of the electric damper are controlled according to the results.

[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. 12 is a block diagram of a conventional control device for a refrigerator-freezer. In FIG. 13, reference numeral 1 denotes a refrigerator main body, which is composed of an outer box 2 and an inner box 3 and a urethane foam heat insulating material 4 formed in a space between them, and has a front opening 3
Two doors 5, 6, 7 are provided. Doors 5, 6, 7
Are arranged corresponding to the openings of the freezer compartment 8, the refrigerator compartment 9 and the vegetable compartment 10 of the refrigerator body 1, respectively.

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 19 is an electric damper.

Reference numeral 20 is a freezer compartment temperature sensor. Two
Reference numeral 1 denotes a freezer compartment internal temperature detecting means for detecting the temperature in the freezer compartment by the freezer compartment temperature sensor 20. Reference numeral 22 is a freezer compartment temperature determining means for determining whether the temperature of the freezer compartment detected by the freezer compartment temperature detecting means 21 is within the set temperature range of the freezer compartment. Reference numeral 23 is a compressor control means for controlling ON / OFF of the compressor 17, and 24 is a fan 1
4 is a fan control means for controlling ON / OFF of No. 4.

Reference numeral 25 is a refrigerating room temperature sensor. Two
Reference numeral 6 denotes a refrigerating compartment temperature detecting means for detecting the temperature in the refrigerating compartment by the refrigerating compartment temperature sensor 25. Reference numeral 27 is a refrigerating compartment temperature determining means for determining whether or not the temperature of the refrigerating compartment detected by the refrigerating compartment temperature detecting means 26 is within a set temperature range of the refrigerating compartment. Reference numeral 28 is an electric damper control means for controlling opening / closing of the electric damper 19.

The operation of the control device for a refrigerator-refrigerator having the above-described structure will be described below with reference to FIGS. 12 and 13.

FIG. 13 (a) is a flow chart for explaining the temperature control of the freezer compartment 8 of the conventional refrigerator-freezer. First, the freezer compartment temperature detecting means 21 detects the inside temperature Tfc of the freezer compartment by the freezer compartment temperature sensor 18 (step 101). Then, the freezer compartment temperature determination means 22 determines that the inside temperature Tfc is the set temperature of the freezer compartment (Tfcon: compressor 1
7, ON temperature of fan 14, Tfcoff: Compressor 1
7, the OFF temperature of the fan 14) (step 102). Based on this judgment, the compressor control means 23 controls ON / OFF of the compressor 17, and the fan control means 24 controls the fan 14 Control ON / OFF of. (Step 103). As described above, the cold air having an appropriate temperature is sent to the freezing compartment 8 to control the temperature of the freezing compartment 8.

FIG. 13B is a flow chart for explaining the temperature control of the refrigerating compartment 9 of the conventional refrigerator-freezer. First, the refrigerating compartment temperature detecting means 26 detects the temperature Tpc in the refrigerating compartment by means of the refrigerating compartment temperature sensor 25 (step 201). Then, the refrigerating compartment temperature judging means 27 judges whether the inside temperature Tpc is within the range of the set temperature of the refrigerating compartment (Tpcon: opening temperature of electric damper, Tpcoff: closing temperature of electric damper) (step 202). Based on this determination, the electric damper control unit 28 controls opening / closing of the electric damper 19.
(Step 203). From the above, the temperature of the refrigerating compartment 9 is adjusted by sending the cool air of a suitable temperature into the refrigerating compartment 9.

[0011]

However, in the above-mentioned structure, 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 load in the freezer, and
In the refrigerating room, the set temperatures (Tpcon, Tpcoff) that are the basis for controlling the electric damper were constant regardless of the load of the refrigerating room, so it was not possible to perform fine temperature control. Even if food is input when the food is low, the freezer and refrigerating room temperature sensors are cooled quickly, and the input food is not cooled sufficiently, and the cooling time of the food becomes long, and in the summer, etc. When it is desired to cool down quickly, there is a problem that optimum temperature control cannot be performed in both the freezer compartment and the refrigerator compartment.

The present invention solves the above problems.
The set temperature is adjusted according to the degree of temperature rise of the inside temperature of the freezer compartment and the refrigerator compartment and the outside air temperature. It is also possible to provide a refrigerator-refrigerator control device that can perform optimum temperature control by determining the rotational speeds of the compressor and fan according to the set temperature and controlling the opening and closing of the fan, compressor, and electric damper. To aim.

[0013]

In order to achieve the above object, a control device for a refrigerator / freezer according to the present invention has a freezer compartment temperature sensor, a freezer compartment temperature detecting means, and a freezer compartment temperature in the freezer compartment. Freezing room temperature determining means for determining whether or not the temperature exceeds the set temperature, an outside air temperature sensor, an outside air temperature detecting means, a freezing room temperature rising degree calculating means for calculating a temperature rising degree of the freezing room, and a setting of the freezing room A fuzzy based on a first memory that stores a control rule based on an empirical rule for obtaining a temperature decrease amount, a temperature increase degree of a freezer compartment, an outside air temperature, and a control rule extracted from the first memory. The first to perform a logical operation to calculate the amount of decrease in the set temperature of the freezer
Of the fuzzy inference processor, the freezing room set temperature calculating means for calculating the set temperature of the freezing room from the reduction range of the set temperature calculated by the first fuzzy inference processor, and the set temperature calculated by the freezing room set temperature calculating means From the above, compressor control means for controlling the compressor, first fan rotation speed determination means for determining the rotation speed of the fan from the range of decrease in the set temperature calculated by the first fuzzy inference processor, and first fan rotation speed And fan rotation speed control means for controlling the fan to the rotation speed determined by the determination means.

Further, a freezing room temperature sensor, a freezing room temperature detecting means, a freezing room temperature judging means for judging whether or not the freezing room temperature exceeds a set temperature of the freezing room, an outside air temperature sensor, and an outside air temperature detecting means. A freezing room temperature rising degree calculating means for calculating the temperature rising degree of the freezing room; 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 first fuzzy inference processor for performing a fuzzy logic operation to calculate a reduction range of a set temperature of a freezing room based on a temperature rise degree, an outside air temperature, and a control rule fetched from a first memory; Freezing room set temperature calculation means for calculating the set temperature of the freezing room from the range of decrease in the set temperature calculated by the fuzzy inference processor, and reduction of the set temperature calculated by the first fuzzy inference processor From the above, the first compressor speed determination means for determining the rotation speed of the compressor from the set temperature calculated by the freezer setting temperature calculation means, and the compressor rotation for controlling the compressor to the rotation speed determined by the compressor rotation speed determination means The first fan rotation speed determining means for determining the rotation speed of the fan from the number control means and the set temperature calculated by the freezer compartment setting temperature calculation means, and the rotation speed determined by the first fan rotation speed determining means. And fan rotation speed control means for controlling the fan.

In the refrigerating compartment, a refrigerating compartment temperature sensor, refrigerating compartment temperature detecting means, refrigerating compartment temperature determining means for determining whether or not the refrigerating compartment temperature exceeds a set temperature of the refrigerating compartment, and an outside air temperature sensor. A second memory for storing an outside air temperature detecting means, a refrigerating room temperature increasing degree calculating means for calculating a temperature increasing degree of the refrigerating room, and a control rule based on an empirical rule for obtaining a reduction range of a set temperature of the refrigerating room A second fuzzy inference processor for performing a fuzzy logic operation based on the temperature rise of the refrigerating compartment, the outside air temperature, and the control rule fetched from the second memory to calculate the range of decrease in the set temperature of the refrigerating compartment. And a refrigerating room set temperature calculating means for calculating the set temperature of the refrigerating room from the reduction range of the set temperature calculated by the second fuzzy inference processor, and a setting calculated by the refrigerating room set temperature calculating means. An electric damper control means for controlling the electric damper from the temperature, a second fan rotation speed determining means for determining the rotation speed of the fan from the reduction range of the set temperature calculated by the second fuzzy inference processor, and a second The fan rotation speed control means controls the fan to the rotation speed determined by the fan rotation speed determination means.

Further, of the fan rotation speed determined by the first fan rotation speed determination means and the fan rotation speed determined by the second fan rotation speed determination means, the higher rotation speed is determined as the fan rotation speed. And a fan rotation speed control means for controlling the fan to the rotation speed determined by the third fan rotation speed determination means.

[0017]

With the above-described structure, the present invention detects the heat load amount of the food put in by the temperature increase degree calculated by the temperature increase degree calculating means of the freezing room, and detects the outside air temperature detected by the outside air temperature detecting means. Then, based on the control rule fetched from the first memory, the fuzzy logic operation is performed by the first fuzzy inference processor to obtain the reduction range of the set temperature of the freezer, and the heat load of the food into which the set temperature is input. When the amount is large and the outside air temperature is high, the set temperature decrease amount is large, and when the heat load of food is small, and when the outside temperature is low, the set temperature decrease amount is adjusted to be small, and the set temperature decrease amount is large. Occasionally, when the rotation speed of the fan is increased, and when the set temperature decrease is small, the rotation speed is decreased and the fan is controlled to reduce the refrigeration capacity. To suppress the temperature influence on the surrounding food can rapidly cool the introduced food.

Further, the heat load amount of the introduced foodstuff is detected by the temperature rise degree calculated by the temperature rise degree calculating means of the freezing room, and the outside air temperature detected by the outside air temperature detecting means is detected. Based on the control rule extracted from the memory, the fuzzy logic operation is performed by the first fuzzy inference processor to obtain the reduction range of the set temperature of the freezer, and the heat load amount of the food having the set temperature is large. When the temperature is high, the set temperature is decreased by a large amount, the heat load of food is small, and when the outside temperature is low, the set temperature is decreased by a small amount. When the rotation speed of the compressor is high and the set temperature is small, the rotation speed of the compressor and fan is reduced to control the fan to reduce the refrigeration capacity. When food is added, the effect of temperature on surrounding food is suppressed, the refrigeration capacity is increased by increasing the rotation speed of the compressor and the rotation speed of the fan, the input food is cooled rapidly, and the internal temperature When stable, it is possible to reduce the refrigerating capacity and save energy by lowering the rotational speed of the compressor and the rotational speed of the fan.

Further, the heat load amount of the introduced foodstuff is detected by the temperature increase degree calculated by the temperature increase degree calculating means of the refrigerating room, and the outside air temperature detected by the outside air temperature detecting means is detected. Based on the control rule retrieved from the memory, the second fuzzy inference processor performs fuzzy logic operation to find the reduction range of the set temperature of the refrigerating room, and the heat load amount of the food that has been put into the set temperature is large. When the temperature is high, the adjustment range is adjusted so that the set temperature decrease is large and the heat load of food is small. When the outside temperature is low, the set temperature decrease range is adjusted to be small. Therefore, the fan rotation speed is increased, and when the set temperature decrease is small, the fan rotation speed is reduced to control the fan so as to reduce the cooling capacity. When the food is turned on, to suppress the temperature influence on the surrounding food, poured food rapidly cooled, food freezing can be prevented.

Further, the heat load amount of the introduced foodstuff is detected by the temperature rise degree calculated by the temperature rise degree calculating means of each of the freezer compartment and the refrigerating room, and the outside air temperature detected by the outside air temperature detecting means is detected. , Based on the control rule extracted from each memory, fuzzy logic operation is performed by each fuzzy inference processor, the reduction width of the set temperature of each of the freezer compartment and the refrigerating room is obtained, and according to the reduction width of each set temperature, The number of revolutions of each fan is determined, and the one with the higher number of revolutions is determined as the number of revolutions of the fan.Therefore, whether food is put in the freezer or food is put in the refrigerator, The fan can be controlled according to the amount of heat load and the outside air temperature, so when it is necessary to cool quickly, the fan is controlled at high speed to cool rapidly and To suppress the temperature influence on the food, it is possible to rapidly cool the introduced food. Further, in the refrigerating compartment side, it is possible to freeze the refrigerated food due to being too cold.

[0021]

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 device 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. 2 (b) is a graph showing the membership function of the fuzzy variable with respect to the temperature rise degree, FIG. 2 (b) 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. 4 is a flowchart for explaining the operation in the embodiment of FIG.
5 is a flowchart for explaining a fuzzy inference procedure in the embodiment of FIG.

In FIG. 1, reference numeral 30 denotes a freezer control device, which includes freezer temperature detecting means 21 and freezer temperature determining means 3.
1, freezing room temperature rise calculation means 32, outside air temperature detection means 33, first memory 34, first fuzzy inference processor 35, freezing room set temperature calculation means 36, compressor control means 23, first fan rotation speed. It comprises a determination means 37 and a fan rotation speed control means 38.

Reference numeral 20 is a freezer compartment temperature sensor for detecting the temperature in the freezer compartment, and the output thereof is inputted to the freezer compartment temperature detecting means 21. The freezer compartment temperature determination means 31 determines whether the detected temperature of the freezer compartment temperature sensor 20 is the temperature (Tfcon) at which the compressor 17 operates, and the compressor control means 23 and the first fan rotation speed determination means 38. To start the compressor 17 and the fan 14.

The outside air temperature detecting means 33 detects the outside air temperature outside the refrigerator by the outside air temperature sensor 39. The freezing room temperature increase degree calculating means 32 calculates the temperature increase degree Tfcup in the refrigerator from the set temperature that the output of the freezing room temperature detecting means 21 stores in the freezing room temperature determining means 31.

The first memory 34 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 35 uses the temperature rise degree Tfc calculated by the freezer compartment temperature rise degree calculating means 32.
A fuzzy logic operation is performed based on up, the outside air temperature detected by the outside air temperature detecting means 33, and the control rule fetched from the freezer compartment memory 34 to calculate the reduction range of the set temperature of the freezer compartment.

Further, the freezer compartment set temperature calculation means 36 calculates the set temperature (Tfcoff) of the freezer compartment from the reduction range of the set temperature calculated by the first fuzzy inference processor 35. Then, the calculated set temperature (Tfcoff) is input to the freezer compartment temperature determination means 31, and the freezer compartment temperature determination means 3 is input.
1 stores a set temperature (Tfcoff), and sends an operation signal until the temperature of the freezer compartment temperature sensor 20 reaches the set temperature (Tfcoff).

The compressor control means 23 operates the compressor 17 while there is an operation signal for the freezer compartment temperature determination means 31.

If there is an operation signal from the freezer compartment temperature determination means 31, the first fan rotation speed determination means 37 determines from the inference result of the first fuzzy inference processor 35 that the set temperature decrease range is large. Increase the rotation speed of the fan 14,
When the decrease range of the set temperature is small, the rotation speed of the fan 14 is determined so as to reduce the rotation speed of the fan 14. Further, if there is no operation signal from the freezer compartment temperature determination means 31, it is determined to stop the fan 14.

The fan speed control means 38 controls the fan 14 at the speed determined by the first fan speed determination means 37.

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

First, the freezing compartment temperature detecting means 21 detects the inside temperature Tfc of the freezing compartment by the freezing compartment temperature sensor 20 (Step 1). Then, the freezer compartment temperature determination means 31
The internal temperature Tfc and the set temperature Tfcon are compared (Step
2) It is determined whether the internal temperature Tfc is equal to or higher than the constant temperature Tfcon (Step 3).

When the temperature is lower than the set temperature Tfcon, the freezer compartment temperature determination means 31 stops the operation signal. Then, the first fan rotation speed determination means 37 determines to stop the fan 14, and the fan rotation speed control means 38 turns off the fan 14.
F (Step 4). Then, in Step 5, the compressor control means 23 turns off the compressor 1714.
Then, the process returns to Step 1.

At Step 3, the internal temperature Tfc is the constant temperature Tfcon.
If it is determined that the above has been reached, the process proceeds to Step 6, and the first fuzzy inference processor 35 causes the freezer compartment temperature detection means 2 to operate.
Input the degree of temperature increase Tfcup = Tfcmax-Tfcon in the refrigerator from the set temperature calculated by 1.

At Step 7, the outside air temperature detected by the outside air temperature detecting means 33 is input, and at Step 8, the first fuzzy inference processor 35 takes out the control rule stored in advance in the first memory 34 and executes the fuzzy inference. Obtain the decrease ΔTfcoff of the set temperature in the freezer. From this, the freezer compartment set temperature calculation means 36 calculates the new set temperature Tfcoff of the freezer compartment (OFF temperature of the compressor 17 and the fan 14) from the reduction range ΔTfcoff of the set temperature obtained by the first fuzzy inference processor 35. Is calculated (Step 9).

In Step 10, the first fan rotation speed determining means 37 determines the rotation speed of the fan 14 from the reduction width ΔTfcoff of the set temperature of the freezer compartment obtained by fuzzy inference, and in Step 11, the fan rotation speed control means. 38
Controls the fan 14 at the rotation speed determined in Step 10. Then, in Step 12, the compressor control means 2
3 operates the compressor 17, and thereafter performs the above-mentioned operation at the set temperature Tfcoff of the freezer (compressor 17, fan 14
Repeat until the temperature reaches (OFF temperature).

Here, the fuzzy inference for obtaining the reduction range of the set temperature for performing the optimum temperature control of the freezing room is executed based on the following control rule.

The control rules adopted in this embodiment are the following nine rules. For example, rule 1: If the temperature rise is small and the outside air temperature is low, decrease the set temperature by a very small amount.

Rule 2: If the temperature rise is small and the outside air temperature is medium, decrease the set temperature by a small amount.

Rule 3: If the temperature rise is small and the outside air temperature is high, decrease the set temperature by a small amount.・ ・ Rule 7: If the temperature rise is large and the outside air temperature is low, increase the set range.

Rule 8: If the temperature rise is large and the outside air temperature is medium, increase the set temperature decrease range.

Rule 9: 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 higher the temperature rise is, the higher the temperature rise is, and the lower the set temperature is, the lower the outside air temperature is, the lower the cooling capacity is. It is a rule obtained from experience that it is not necessary to further lower the set temperature.

Therefore, the language rule is a control rule for the degree of decrease in the set temperature that enables the optimum temperature control of the freezer compartment, which is obtained by the inventor from a large number of experimental data. The relationship between the outside air temperature AT is as shown in (Table 1).

[0045]

[Table 1]

(Table 1) is a table showing the relationship of the control rules, and the temperature increase degree T is three steps in the horizontal direction (BT = large, MT =).
Medium, ST = Small, outside air temperature AT in 3 levels (HAT = High,
MAT = medium, LAT = low), and the optimum refrigeration corresponding to the temperature increase degree T and the outside air temperature AT is provided at each intersection of the temperature increase degree T and the outside air temperature AT. The reduction width ΔT of the set temperature of the chamber is arranged.

When the language rules are stored in the first memory 34 of FIG. 1, they are stored according to the following rule rule. The control rules adopted in this embodiment are nine.

Rule 1: IF T is ST and
AT is LAT THEN ΔT is VS Rule 2: IF T is ST and AT is
MAT THEN ΔT is S Rule 3: IF T is ST and AT is
HAT THEN ΔT is S ··· Rule 7: IF T is MT and AT is
LAT THEN ΔT is B Rule 8: IF T is BT and AT is
MAT THEN ΔT is B Rule 9: IF T is BT and AT is
HAT THEN ΔT is VB control rule 1, rule 2, ..., Rule 9 is such that the temperature increase degree T, the outside air temperature AT, and the decrease width ΔT of the set temperature of the freezer are stepwise as shown in (Table 1). Therefore, when performing fine control, the temperature rise degree T,
For the actually measured temperature rise Tfcup and the outside air temperature Tout in the middle of each stage of the outside air temperature AT, the antecedent part (I
Calculate the degree to which the F part) is satisfied,
It is necessary to estimate the decrease ΔT of the set temperature according to the degree. Therefore, in the present embodiment, the degree is calculated by using the membership function of the fuzzy variable with respect to 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.
FIG. 2B shows the membership functions μLAT (Tout) and μMAT (Tou) of the fuzzy variables LAT, MAT, and HAT with respect to the outside air temperature AT.
t) and μHAT (Tout) are shown.

The fuzzy inference executed by the first fuzzy inference processor 35 is control rule 1, rule 2, ...
A fuzzy logic operation is performed using the rule 9 and the membership functions of FIGS. 2A and 2B to calculate the degree of decrease in the set temperature of the freezer compartment.

The procedure of fuzzy inference which is Step 8 of FIG. 3 will be described below with reference to the flowchart of FIG.

At Step 20, the first fuzzy inference processor 35 causes the temperature rise degree Tfcup and the outside air temperature Tou.
Using the fuzzy variable membership function for t,
Membership values (indicated as M values in the figure) at the temperature increase degree Tfcup and the outside air temperature Tout are calculated.

At Step 21, the obtained temperature rise T
The degree to which the membership values of the fuzzy variables for 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, A is a fuzzy variable with respect to the degree of temperature rise, and B is a fuzzy variable with respect to the outside air temperature.

Rule 1: h1 = μST (Tfcup) ∩μLST (Tout) = μST (Tfcup) × μLAT (Tout)-(1) Rule 2: h2 = μST (Tfcup) ∩μMAT (Tout) = μST ( Tfcup) × μMAT (Tout) −−− (2) Rule 3: h3 = μST (Tfcup) ∩μHAT (Tout) = μST (Tfcup) × μHAT (Tout) −− (3) ... Rule 7: h7 = μBT (Tfcup) ∩μLAT (Tout) = μMT (Tfcup) × μLAT (Tout) --- (7) Rule 8: h8 = μBT (Tfcup) ∩μMAT (Tout) = μBT (Tfcup) × μMAT (Tout)- --- (8) Rule 9: h9 = μBT (Tfcup) ∩μHAT (Tout) = μBT (Tfcup) × μHAT (Tout)-(9) In the formula (1), Tfcup is the region ST with respect to the temperature rise degree T. And Tout is the area for the outside air temperature AT The proposition of entering LAT means that the product of the ratio of Tfcup entering ST and the ratio of Tout entering LAT holds, that is, the antecedent part of rule 1 holds at a ratio of h1. Similarly, in the case of rule 2, ..., Rule 9, which is formula (2), ..., (9), the antecedent part is h
2, ..., H9 is established.

At Step 22, the degree of decrease ΔT in 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 unit of the control rule as follows. The decrease width ΔTfcoff of the set temperature is
Calculated as shown in (Equation 1) as the weighted average value of the proportions h1, h2, ... To do.

[0057]

[Equation 1]

As a result, the range of decrease in the set temperature ΔTfcoff
Is found. Then, the range of decrease Δ of the set temperature obtained by this
When Tfcoff is large, it is necessary to increase the cooling capacity, so the first fan rotation speed determination means 37 determines the rotation speed of the fan 14 to be high, and the set temperature decrease width ΔT.
When fcoff is small, the cooling capacity is not so much required, and therefore the first fan rotation speed determining means 37 uses the fan 14
Decide the rotation speed of.

Therefore, in this embodiment, the degree of temperature rise in the freezer compartment and the outside air temperature are used as control parameters, and the amount of decrease in the set temperature of the freezer compartment is set according to the heat load amount of the food and the outside air temperature. Calculated and set temperature is large, the heat load of the food is large, and the outside temperature is high, the decrease range of the set temperature is large, the heat load of the food is small, and the outside temperature is low, the decrease range of the set temperature is small. Therefore, when the set temperature decrease amount is large, it is necessary to cool rapidly. Therefore, the rotation speed of the fan 14 is increased to cool rapidly, and when the set temperature decrease amount is small, a large amount of refrigeration is performed. Since the capacity is not required, the fan 14 is controlled so as to reduce the rotation speed of the fan 14, so that energy saving can be achieved.

Next, a second embodiment will be described with reference to the drawings. Further, in the figure, the same components as those in 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 configuration of the control device for the freezer compartment of the refrigerator / freezer according to the second embodiment of the present invention, and FIG. 6 is a flow chart for explaining the operation of the second embodiment of the present invention. is there.

In FIG. 5, reference numeral 40 is a compressor rotation number determining means, and if there is an operation signal from the freezer compartment temperature determining means 31, when the set temperature decrease amount is larger than the inference result of the first fuzzy inference processor 35. Determines the rotation speed of the compressor 17 so as to increase the rotation speed of the compressor 17 and decrease the rotation speed of the compressor 17 when the set temperature decrease amount is small. If there is no operation signal from the freezer compartment temperature determination means 31, it is determined to stop the compressor 17.

The compressor speed control means 41
Controls the compressor 17 at the rotation speed determined by the compressor rotation speed determination means 40.

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. 5 and 6.

First, the freezing compartment temperature detecting means 21 detects the inside temperature Tfc of the freezing compartment by the freezing compartment temperature sensor 20 (Step 31). Then, the freezer compartment temperature determination means 31
Compares the internal temperature Tfc with the set temperature Tfcon (Step
32), it is determined whether the internal temperature Tfc is equal to or higher than the constant temperature Tfcon (Step 33).

When the temperature is lower than the set temperature Tfcon, the freezing room temperature judging means 31 stops the operation signal. Then, the first fan rotation speed determination means 37 determines to stop the fan 14), and the fan rotation speed control means 38 turns the fan 14 off.
FF is performed (Step 34). Then, in Step 35, the compressor control means 23 turns off the compressor 17.
Then, the process returns to Step 31.

In Step 33, the internal temperature Tfc is the constant temperature Tfc
If it is determined that the temperature is equal to or higher than "on", the process proceeds to Step 36, and the first fuzzy reasoning processor 35 causes the freezing room temperature detecting means 21 to calculate the temperature increase T in the refrigerator from the set temperature.
Input fcup = Tfcmax-Tfcon.

At Step 37, the outside air temperature detected by the outside air temperature detecting means 33 is input, and at Step 38, the first fuzzy inference processor 35 takes out the control rule stored in advance in the first memory 34 and executes the fuzzy inference. Obtain the decrease ΔTfcoff of the set temperature in the freezer. From this, the freezer compartment set temperature calculation means 36 calculates the new set temperature Tfco of the freezer compartment from the decrease ΔTfcoff of the set temperature obtained by the first fuzzy inference processor 35.
ff (OFF temperature of compressor 17 and fan 14) is calculated (Step 39).

At Step 40, the first fan rotation speed determination means 37 determines the rotation speed of the fan 14 from the reduction width ΔTfcoff of the set temperature of the freezer compartment obtained by fuzzy inference, and at Step 41, the fan rotation speed control means. 38
Controls the fan 14 at the rotation speed determined in Step 40.

At Step 42, the compressor rotation speed determination means 40 determines the rotation speed of the compressor 17 from the reduction width ΔTfcoff of the set temperature of the freezer compartment obtained by fuzzy inference, and at Step 43, the compressor rotation speed control means 41 The compressor 17 is controlled at the rotation speed determined in Step 42.

Thereafter, the above operation is performed by setting the freezing room temperature Tfcoff.
Repeat until (compressor 17, fan 14 OFF temperature).

Here, the fuzzy inference for obtaining the reduction range of the set temperature for optimum temperature control of the freezer is the same as that of the first embodiment of the present invention.

In this embodiment, the temperature rise in the freezer compartment and the outside air temperature are used as the control parameters, and the membership function is the same as in FIG.

Then, according to these control parameters,
The degree of decrease in the set temperature of the freezer is calculated by the same procedure as in FIG. 4, and according to the heat load amount of the put food and the outside air temperature,
Calculates the amount of decrease in the set temperature of the freezer, and the heat load of the food that has been supplied with the set temperature is large, and when the outside temperature is high, the decrease of the set temperature is large, the heat load of the food is small, and the outside temperature is high. When the temperature is low, the amount of decrease in the set temperature is adjusted to be small. When the amount of decrease in the set temperature is large, it is necessary to cool rapidly. Therefore, the rotational speeds of the compressor 17 and the fan 14 are increased to cool rapidly. When the reduction range of the set temperature is small, a large refrigerating capacity is not required, so that the fan 14 is controlled so as to reduce the rotational speeds of the compressor 17 and the fan 14, so that energy saving can be achieved.

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

FIG. 7 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.
FIG. 8A is a graph showing a membership function of a fuzzy variable with respect to the temperature rise inside the refrigerating compartment in the third embodiment of the present invention, and FIG. 8B is the outside air temperature in the third embodiment of the present invention. Is a graph showing the membership function of the fuzzy variable with respect to, and FIG. 9 is a flow chart for explaining the operation in the third embodiment of the present invention.

In FIG. 7, reference numeral 50 denotes a refrigerating compartment control device, which is a refrigerating compartment interior temperature detecting means 26, a refrigerating compartment interior temperature determining means 51, a refrigerating compartment temperature rise degree calculating means 52, an outside air temperature detecting means 33, A second memory 53, a second fuzzy inference processor 54, a refrigerating room set temperature calculation means 55, an electric damper control means 28, a second fan rotation speed determination means 56,
The fan rotation speed control means 38 is provided.

Reference numeral 25 is a refrigerating compartment temperature sensor for detecting the temperature in the refrigerating compartment, and its output is inputted to the refrigerating compartment temperature detecting means 26. The refrigerating compartment temperature determining means 51 determines whether or not the detected temperature of the refrigerating compartment temperature sensor 25 is the temperature at which the electric damper 19 opens, and outputs it to the electric damper control means 28 and the second fan rotation speed determining means 56. Then electric damper 1
9. Start the fan 14.

The outside air temperature detecting means 33 detects the outside air temperature outside the refrigerator by the outside air temperature sensor 39. The refrigerating compartment temperature increase degree calculating means 52 determines the temperature rise degree Tpcup in the refrigerator by the output of the refrigerating compartment temperature detecting means 26.

The second memory 53 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 54 uses the temperature rise degree Tpc calculated by the refrigerating compartment temperature rise degree calculation means 52.
A fuzzy logic operation is performed based on up, the outside air temperature detected by the outside air temperature detecting means 33, and the control rule retrieved from the second memory 53 to calculate the amount of decrease in the set temperature of the refrigerating compartment.

Further, the refrigerating room set temperature calculating means 55 calculates the set temperature of the refrigerating room from the reduction range of the set temperature calculated by the second fuzzy inference processor 54. The electric damper control means 28 controls the temperature of the refrigerator compartment temperature sensor 25 to
The electric damper 19 is opened until the set temperature calculated by the refrigerating room set temperature calculating means 55 is reached.

The electric damper control means 28 maintains the electric damper 19 in an open state while the open signal of the refrigerating compartment temperature determination means 51 is given.

If there is an open signal from the refrigerating room temperature determination means 51, the second fan rotation speed determination means 56 determines that the decrease in the set temperature is larger than the inference result of the second fuzzy inference processor 54. When the rotation speed of the fan 14 is increased and the decrease in the set temperature is small, the rotation speed of the fan 14 is determined so as to be decreased. Also,
If there is no open signal from the refrigerating room temperature determination means 51, it is determined to stop the fan 14.

Then, the fan rotation speed control means 38 controls the fan 14 at the rotation speed determined by the second fan rotation speed determination means 56.

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. 7 to 9.

First, the refrigerating compartment temperature detecting means 26 detects the inside temperature Tpc in the refrigerating / freezing compartment by means of the refrigerating compartment temperature sensor 25 (Step 51). And the refrigerating room temperature determination means 51
Compares the internal temperature Tpc with the set temperature Tpcon (Step
52), it is determined whether the internal temperature Tpc is equal to or higher than the constant temperature Tpcon (Step 53).

When the temperature is lower than the set temperature Tpcon, the refrigerating compartment temperature determining means 51 stops the open signal. Then, the second fan rotation speed determination means 56 determines to stop the fan 14, and the fan rotation speed control means 38 turns off the fan 14.
Yes (Step 54). Then, in Step 55, the electric damper control unit 28 closes the electric damper 19, and the Step
Return to 51.

In Step 53, the internal temperature Tfc is the constant temperature Tfc
If it is determined that the temperature is equal to or more than "on", the process proceeds to Step 56, and the second fuzzy inference processor 54 inputs the temperature rise degree Tpcup = Tpcmax-Tpcon in the refrigerator from the set temperature calculated by the refrigerating compartment temperature detecting means 26. To do.

At Step 57, the outside air temperature detected by the outside air temperature detecting means 33 is input, and at Step 58, the second fuzzy inference processor 54 takes out the control rule stored in advance in the second memory 53 and executes the fuzzy inference. Obtain the decrease ΔTpcoff of the set temperature in the refrigerator compartment. From this, the refrigerating room set temperature calculation means 55 calculates the new set temperature Tpco of the refrigerating room from the decrease ΔTpcoff of the set temperature obtained by the second fuzzy inference processor 54.
ff (close of electric damper 19, off temperature of fan 14) is calculated (Step 59).

At Step 60, the second fan rotation speed determination means 56 determines the rotation speed of the fan 14 from the reduction width ΔTpcoff of the set temperature of the refrigerating compartment obtained by fuzzy inference, and at Step 61, the fan rotation speed control means. 57
Controls the fan 14 at the rotation speed determined in Step 60. Then, at Step 62, the electric damper control means 28
Opens the electric damper 19, and thereafter performs the above operation for the set temperature Tpcoff of the refrigerating chamber (close the electric damper 19, turn off the fan 14).
Repeat until the temperature reaches).

Here, the fuzzy inference for obtaining the decrease 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 rules. For example, rule 1: If the temperature rise is small and the outside air temperature is low, decrease the set temperature by a very small amount.

Rule 2: If the temperature rise is small and the outside air temperature is medium, decrease the set temperature by a small amount.

Rule 3: If the temperature rise is small and the outside air temperature is high, decrease the set temperature by a small amount.・ ・ Rule 7: If the temperature rise is large and the outside air temperature is low, increase the set range.

Rule 8: If the temperature rise is large and the outside air temperature is medium, increase the set temperature decrease range.

Rule 9: If the temperature rise is large and the outside air temperature is high, increase the set temperature by a large amount.
Etc.

This means that the higher the temperature of the food, the higher the temperature rise. The higher the temperature rise, the lower the set temperature. The lower the outside temperature, the lower the temperature of the food in the refrigeration compartment. This is a rule obtained from experience that there is a high risk of freezing, and it is necessary to reduce the set temperature decrease range.

Therefore, the above-mentioned language rule is a control rule for the degree of decrease in the set temperature that enables 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 is as shown in (Table 2).

[0099]

[Table 2]

(Table 2) is a table showing the relationship of the control rules, in which the temperature increase degree T is in three levels in the horizontal direction (BT = large, MT =
Medium, ST = Small, outside air temperature AT in 3 levels (HAT = High,
MAT = medium, LAT = low), and the optimum refrigeration corresponding to the temperature increase degree T and the outside air temperature AT is provided at each intersection of the temperature increase degree T and the outside air temperature AT. The reduction width ΔT of the set temperature of the chamber is arranged.

When the language rules are stored in the second memory 53 shown in FIG. 7, they are stored according to the following rule rules. The control rules adopted in this embodiment are nine.

Rule 1: IF T is ST and
AT is LAT THEN ΔT is VS Rule 2: IF T is ST and AT is
MAT THEN ΔT is S Rule 3: IF T is ST and AT is
HAT THEN ΔT is S ··· Rule 7: IF T is MT and AT is
LAT THEN ΔT is B Rule 8: IF T is BT and AT is
MAT THEN ΔT is B Rule 9: IF T is BT and AT is
HAT THEN ΔT is VB control rule 1, rule 2, ..., Rule 9 is such that the temperature rise degree T, the outside air temperature AT, and the decrease width ΔT of the set temperature of the freezer are stepwise as shown in (Table 2). Therefore, when performing fine control, the temperature rise degree T,
For the actually measured temperature rise Tfpup and the outside air temperature Tout in the middle of each stage of the outside air temperature AT, the antecedent (I
Calculate the degree to which the F part) is satisfied,
It is necessary to estimate the decrease ΔT of the set temperature according to the degree. Therefore, in this embodiment, the degree is calculated by using the membership function of the fuzzy variable with respect to the temperature increase degree T and the outside air temperature AT.

FIG. 8A shows membership functions μST (Tfcup), μMT (Tfcup), μBT of the fuzzy variables ST, MT, BT with respect to the temperature rise T in the refrigerator compartment.
FIG. 8B shows the membership functions μLAT (Tout) and μMAT (Tou) of the fuzzy variables LAT, MAT, and HAT with respect to the outside air temperature AT.
t) and μHAT (Tout) are shown.

The fuzzy inference executed by the second fuzzy inference processor 54 is control rule 1, rule 2, ...
A fuzzy logic operation is performed using rule 9 and the membership functions shown in FIGS. 8A and 8B to calculate the degree of decrease in the set temperature of the freezer compartment.

The procedure of fuzzy inference, which is Step 58 of FIG. 8, will be described below with reference to the flowchart of FIG.

At Step 20, the second fuzzy inference processor 54 causes the temperature rise degree Tpcup and the outside air temperature Tou.
Using the fuzzy variable membership function for t,
Membership values (indicated as M values in the figure) at the temperature increase degree Tfcup and the outside air temperature Tout are calculated.

In Step 21, 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 for the temperature rise is indicated by A, and the fuzzy variable for the outside air temperature is indicated by B.

Rule 1: h1 = μST (Tpcup) ∩μLST (Tout) = μST (Tpcup) × μLAT (Tout)-(1) Rule 2: h2 = μST (Tpcup) ∩μMAT (Tout) = μST ( Tpcup) × μMAT (Tout) −−− (2) Rule 3: h3 = μST (Tpcup) ∩μHAT (Tout) = μST (Tpcup) × μHAT (Tout) −− (3) ... Rule 7: h7 = μBT (Tpcup) ∩μLAT (Tout) = μMT (Tpcup) × μLAT (Tout) --- (7) Rule 8: h8 = μBT (Tpcup) ∩μMAT (Tout) = μBT (Tpcup) × μMAT (Tout)- -(8) Rule 9: h9 = μBT (Tpcup) ∩μHAT (Tout) = μBT (Tpcup) × μHAT (Tout)-(9) Equation (1) is a region ST for the temperature rise degree T. And Tout is the area for the outside air temperature AT The proposition of entering LAT means that the product of the ratio of Tpcup entering ST and the ratio of Tout entering LAT is satisfied, that is, the antecedent part of rule 1 is satisfied at a ratio of h1. Similarly, in the case of rule 2, ..., Rule 9, which is formula (2), ..., (9), the antecedent part is h
2, ..., H9 is established.

At Step 22, the decrease amount ΔT of the set temperature of the freezer compartment at the temperature increase degree Tpcup and the outside air temperature Tout is obtained by the membership function of the execution unit of the control rule as follows. The set temperature decrease width ΔTpcoff is
Calculated as shown in (Equation 2) as the weighted average value of the proportions h1, h2, ... To do.

[0111]

[Equation 2]

As a result, the range of decrease in the set temperature ΔTpcoff
Is found. Then, the range of decrease Δ of the set temperature obtained by this
When Tpcoff is large, it is necessary to increase the cooling capacity. Therefore, the second fan rotation speed determination means 56 determines the rotation speed of the fan 14 to be high, and the set temperature decrease width ΔT.
When pcoff is small, since the cooling capacity is not so required, the second fan rotation speed determining means 56 determines the fan 14
Decide the rotation speed of.

Therefore, in this embodiment, the temperature rise in the refrigerating compartment and the outside air temperature are used as the control parameters, and the range of decrease in the set temperature of the refrigerating compartment is set according to the heat load amount of the food and the outside air temperature. Calculated and set temperature is large, the heat load of the food is large, and the outside temperature is high, the decrease range of the set temperature is large, the heat load of the food is small, and the outside temperature is low, the decrease range of the set temperature is small. Therefore, when the set temperature decrease amount is large, it is necessary to cool rapidly. Therefore, the rotation speed of the fan 14 is increased to cool rapidly, and when the set temperature decrease amount is small, a large amount of refrigeration is performed. Since the fan 14 is controlled so that the rotation speed of the fan 14 is lowered because the capacity is not required, very fine control is possible. For example, when food is put in the refrigerator,
Controls the effect of temperature on the surrounding foods, and the input foods are rapidly
In addition, it is possible to cool the chilled food without freezing due to overcooling (overshoot). Further, since the control rule is based on human experience, it is possible to control the temperature of the refrigerating room at an optimum set temperature and save energy.

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

FIG. 10 is a block diagram showing the configuration of the control device for the refrigerator / freezer in the fourth embodiment of the present invention, and FIG. 11 is a flow chart for explaining the operation in the embodiment of the present invention.

In FIG. 10, reference numeral 61 denotes a third fan rotation speed determination means, which is the rotation speed determined by the first fan rotation speed determination means 37 in the freezer compartment control device 30 and the refrigeration compartment control device 50. Second fan rotation speed determining means 56
Of the rotational speeds determined by 1, the higher rotational speed is determined as the rotational speed of the fan 14. The fan rotation speed control means 28 controls the fan 14 to the rotation speed determined by the third fan rotation speed determination means 61.

The operation of the control device for the refrigerating refrigerator having the above-described structure will be described below with reference to FIGS. 3, 9, 10 and 11.

First, on the freezing compartment side, the temperature control of the same freezing compartment as shown in FIG. 3 of the first embodiment is performed except for the control of the rotation speed of the fan 14 (Step 11) (Step 7).
1).

Next, on the refrigerating compartment side, the same temperature control control of the refrigerating compartment as shown in FIG. 9 of the third embodiment is performed except for the control of the rotational speed of the fan 14 (Step 61) (Step).
p72). Then, the third fan rotation speed control means 61
Is the rotational speed of the fan 14 whichever is higher in the rotational speed determined by the first fan rotational speed determination means 37 in Step 10 and the rotational speed determined by the second fan rotational speed determination means 56 in Step 60. (Step 73). Then, the fan rotation speed control means 28 controls the fan 14 so that the rotation speed is determined by the third fan rotation speed determination means 61 (Step 74). St described above
By repeating ep71 to Step74, the refrigerator / freezer is controlled.

Therefore, in this embodiment, in determining the rotation speed of the fan 14, the higher rotation speed of the rotation speeds required from the freezing compartment conditions and the refrigerating compartment conditions is determined by the fan. Since the number of rotations is set to 14, whether the food is put in the freezer or the refrigerating room, the temperature effect on the surrounding food is suppressed and the put food is cooled rapidly. Is possible. Also, in the refrigerator compartment, the open / close control of the electric damper prevents the frozen food from freezing due to overcooling, and because the control rule is based on human experience, it freezes at the optimum set temperature. It is possible to finely control the temperature of both the refrigerator and the refrigerator.

[0121]

As described above, according to the present invention, in a freezer-refrigerator capable of freezing, refrigerating and storing food, the freezing room temperature sensor, the freezing room temperature detecting means, and the freezing room temperature are provided in the freezing room. Freezing room temperature determining means for determining whether or not the set temperature of the freezing room has been exceeded, an outside air temperature sensor, an outside air temperature detecting means, and a freezing room temperature for calculating the degree of temperature rise of the freezing room by the output of the freezing room temperature detecting means Based on the rising degree calculation means, a first memory that stores a control rule based on an empirical rule for obtaining the reduction range of the set temperature of the freezer, the outside air temperature, and the control rule extracted from the first memory. , The fuzzy logic operation is performed to reduce the set temperature of the freezer by the first fuzzy inference processor. When the load is small and the outside air temperature is low, calculation is performed to reduce the set temperature decrease range, and the freezer set temperature calculation means for calculating the set temperature of the freezer from the set temperature decrease range, and the freezer set temperature calculation Based on the set temperature calculated by the means, the compressor control means for controlling the compressor, and when the set temperature is greatly decreased, it is necessary to cool it rapidly, so the fan rotation speed is increased and cooling is performed rapidly. When the temperature decrease amount is small, the first fan rotation speed determining means for determining the rotation speed of the fan to lower the rotation speed of the fan to reduce the refrigerating capacity, and the fan rotation for controlling the fan at the determined rotation speed. By providing the number control means, the input food can be rapidly cooled when a large refrigerating capacity is required such as when the food is put into the freezer. 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, the freezing room temperature sensor, the freezing room temperature detecting means, the freezing room temperature judging means for judging whether or not the freezing room temperature exceeds the set temperature of the freezing room, the outside air temperature sensor, and the outside air temperature detecting means. And a freezing room temperature increase degree calculating means for calculating the temperature increase degree of the freezing room based on the output of the freezing room temperature detecting means, and a control rule based on an empirical rule for deciding the range of decrease in the set temperature of the freezing room. Based on the first memory, the outside air temperature, and the control rule extracted from the first memory, the fuzzy logic operation is performed to decrease the set temperature of the freezer compartment by the first fuzzy inference processor. When the heat load is large and the outside air temperature is high, the reduction range is large, and when the food heat load is small and the outside temperature is low, the set temperature decrease range is reduced.
When the freezing room set temperature calculation means for calculating the set temperature of the freezer from the set temperature decrease range and the set temperature decrease range calculated by the first fuzzy inference processor are large,
When the rotation speeds of the compressor and the fan are increased and the reduction range is small, the rotation speed of the compressor and the fan is decreased to determine the rotation speed of the fan so as to reduce the refrigerating capacity. By including a fan rotation speed control means for controlling the fan at different rotation speeds, when food is put into the freezer, the influence of temperature on the surrounding food is suppressed, and the rotation speed of the compressor and the rotation of the fan are suppressed. Increase the refrigeration capacity by increasing the number to cool the input food rapidly, and when the temperature in the refrigerator is stable, lower the compressor rotation speed and fan rotation speed to reduce the refrigeration performance and save energy. 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.

In the refrigerating compartment, a refrigerating compartment temperature sensor, refrigerating compartment temperature detecting means, refrigerating compartment temperature determining means for determining whether or not the refrigerating compartment temperature exceeds a set temperature of the refrigerating compartment, and an outside air temperature sensor. , An outside air temperature detecting means, a refrigerating room temperature increase degree calculating means for calculating a temperature rise degree of the refrigerating room by an output of the refrigerating room temperature detecting means, and a control based on an empirical rule for obtaining a reduction range of a set temperature of the refrigerating room Based on the first memory for storing the rule, the outside air temperature, and the control rule extracted from the first memory, the fuzzy logic operation is performed to decrease the set temperature of the refrigerating room by the second fuzzy inference processor. , When the heat load of the introduced food is large and the outside air temperature is high, the reduction range is large, and when the heat load of the food is small and the outside temperature is low, the decrease amount of the set temperature is calculated to be small. A refrigerating room set temperature calculating means for calculating the set temperature of the refrigerating room from the decrease range of the set temperature, an electric damper control means for controlling the electric damper from the set temperature calculated by the refrigerating room set temperature calculating means, and a set temperature When the amount of reduction is large, it is necessary to cool it rapidly so that the fan rotation speed is increased and cooling is performed rapidly.When the decrease in the set temperature is small, the fan rotation speed is reduced to reduce the refrigeration capacity. By providing the second fan rotation speed determination means for determining the rotation speed of the fan and the fan rotation speed control means for controlling the fan at the determined rotation speed, when food is put into the refrigerating room, It is possible to suppress the influence of temperature on surrounding foods, rapidly cool the input foods, and prevent the foods from freezing. Moreover, since the control rule is based on human experience, the temperature control of the freezer can be controlled at the optimum set temperature.

Further, of the rotational speed determined by the first fan rotational speed determination means and the rotational speed determined by the second fan rotational speed determination means, the higher rotational speed is determined as the fan rotational speed. By providing the fan rotation speed determination means of No. 3 and the fan rotation speed control means for controlling the fan to the determined rotation speed, the rotation speed required from the condition of the freezer compartment and the rotation speed required from the condition of the refrigerating compartment can be controlled. Among them, the one with the higher rotation speed is determined as the rotation speed of the fan, so whether the food is put in the freezer or the refrigerator, the heat load of the put food and the outside air Since the fan can be controlled according to the temperature, when the fan needs to be cooled quickly, the fan can be controlled at high speed to cool the food rapidly, suppress the temperature effect on the surrounding food, and cool the input food rapidly. It is possible. Further, in the refrigerating compartment side, it is possible to freeze the refrigerated food due to being too cold.

[Brief description of drawings]

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

FIG. 2 (a) is a characteristic diagram showing a membership function of a fuzzy variable with respect to the temperature rise in the freezer compartment in the first embodiment, and FIG. 2 (b) is a fuzzy variable with respect to the outside air temperature in the first embodiment. Characteristic diagram showing membership function

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 of a freezer compartment of a refrigerator / freezer showing a second embodiment of the present invention.

FIG. 6 is a flowchart for explaining the operation in FIG.

FIG. 7 is a block diagram of a control device for a refrigerating room of a refrigerator / freezer showing a third embodiment of the present invention.

FIG. 8 (a) is a characteristic diagram showing a membership function of a fuzzy variable with respect to the temperature rise inside the refrigerating compartment in the third embodiment, and FIG. 8 (b) is a fuzzy variable with respect to the outside air temperature in the third embodiment. Characteristic diagram showing membership function

9 is a flowchart for explaining the operation in FIG.

FIG. 10 is a block diagram of a control device for a refrigerator-freezer showing a fourth embodiment of the present invention.

11 is a flowchart for explaining the operation in FIG.

FIG. 12 is a block diagram of a conventional controller for a refrigerator-freezer.

FIG. 13A is a flowchart showing a temperature control of a freezer compartment of a conventional freezer-refrigerator; b) A flowchart showing a temperature control of a refrigerating compartment of a conventional freezer-refrigerator.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 14 Fan 17 Compressor 19 Electric damper 20 Freezing room temperature sensor 21 Freezing room temperature detecting means 23 Compressor controlling means 25 Refrigerating room temperature sensor 26 Refrigerating room temperature detecting means 28 Electric damper control means 30 Freezing room control device 31 Freezing room temperature judging means 32 freezing room temperature rise degree calculating means 33 outside air temperature detecting means 34 first memory 35 first fuzzy inference processor 36 freezing room set temperature calculating means 37 first fan rotation speed determining means 38 fan rotation speed control means 39 outside air temperature Sensor 40 Compressor rotation speed determination means 41 Compressor rotation speed control means 50 Refrigerator control device 51 Refrigerator temperature determination means 52 Refrigerator temperature rise calculation means 53 Second memory 54 Second fuzzy inference processor 55 Refrigerator set temperature Computing means 56 Second fan rotation Number determination means

Claims (4)

[Claims] 1. A freezer-refrigerator provided with a freezer compartment capable of freezing and storing food, a freezer compartment temperature sensor provided in the freezer compartment, and a freezer compartment detecting the temperature in the freezer compartment by the freezer compartment temperature sensor. A temperature detecting means, a temperature detected by the freezing room temperature detecting means, a freezing room temperature determining means for determining whether or not a set temperature of the freezing room is exceeded, an outside air temperature sensor provided outside the freezer-refrigerator, and Outside air temperature detecting means for detecting the outside air temperature outside the freezer-refrigerator by an outside air temperature sensor, freezing room temperature rising degree calculating means for calculating the temperature rising degree of the freezing room by the output of the freezing room temperature detecting means, and setting of the freezing room A first memory for storing a control rule based on an empirical rule for obtaining a temperature reduction range;
A fuzzy logic operation is performed based on the temperature increase degree calculated by the freezer compartment temperature increase degree calculating means, the outside air temperature detected by the outside air temperature detecting means, and the control rule fetched from the first memory. A first fuzzy inference processor that calculates the amount of decrease in the set temperature of the freezer;
A compressor for calculating a set temperature of the freezer from the set temperature calculated by the freezer setting temperature calculating means and the set temperature calculated by the freezer setting temperature calculating means from the reduction range of the set temperature calculated by the first fuzzy inference processor. Compressor control means, first fan rotation speed determination means for determining the rotation speed of the fan from the reduction range of the set temperature calculated by the first fuzzy inference processor, and the first fan rotation speed determination And a fan rotation speed control means for controlling the fan at the rotation speed determined by the means. 2. A freezer-refrigerator provided with a freezer compartment capable of freezing and storing food, and a freezer compartment temperature sensor provided in the freezer compartment, and a freezer compartment detecting the temperature in the freezer compartment by the freezer compartment temperature sensor. A temperature detecting means, a temperature detected by the freezing room temperature detecting means, a freezing room temperature determining means for determining whether or not a set temperature of the freezing room is exceeded, an outside air temperature sensor provided outside the freezer-refrigerator, and Outside air temperature detecting means for detecting the outside air temperature outside the freezer-refrigerator by an outside air temperature sensor, freezing room temperature rising degree calculating means for calculating the temperature rising degree of the freezing room by the output of the freezing room temperature detecting means, and setting of the freezing room A first memory for storing a control rule based on an empirical rule for obtaining a temperature reduction range;
A fuzzy logic operation is performed based on the temperature increase degree calculated by the freezer compartment temperature increase degree calculating means, the outside air temperature detected by the outside air temperature detecting means, and the control rule fetched from the first memory. A first fuzzy inference processor that calculates the amount of decrease in the set temperature of the freezer;
Freezing room set temperature calculating means for calculating the set temperature of the freezing room from the range of decrease in the set temperature calculated by the first fuzzy inference processor, and the range of decrease in the set temperature calculated by the first fuzzy inference processor From the compressor rotation speed determining means for determining the rotation speed of the compressor, the compressor rotation speed control means for controlling the compressor at the rotation speed determined by the compressor rotation speed determining means, and the freezer compartment temperature calculating means for calculating. A first fan rotation speed determination means for determining the rotation speed of the fan from the set temperature and a fan rotation speed control means for controlling the fan to the rotation speed determined by the first fan rotation speed determination means. A control device for a freezer compartment of a refrigerator / freezer. 3. A freezer-refrigerator provided with a refrigerating compartment capable of cooling and storing food, a refrigerating compartment temperature sensor provided in the refrigerating compartment, and a refrigerating compartment detecting the temperature in the refrigerating compartment by the refrigerating compartment temperature sensor. A temperature detecting means, a temperature detected by the refrigerating compartment temperature detecting means, a refrigerating compartment temperature determining means for determining whether or not it exceeds a set temperature of the refrigerating compartment, an outside air temperature sensor provided outside the refrigerator / freezer, An outside air temperature detecting means for detecting an outside air temperature outside the freezer / refrigerator by an outside air temperature sensor, a refrigerating room temperature rising degree calculating means for calculating a temperature rising degree of the refrigerating room by an output of the refrigerating room temperature detecting means, and a setting of the refrigerating room A first memory for storing a control rule based on an empirical rule for obtaining a temperature reduction range;
A fuzzy logic operation is performed 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 second memory. A second fuzzy inference processor that calculates the amount of reduction in the set temperature of the refrigerator compartment;
An electric motor is operated from a refrigerating room set temperature calculating means for calculating the set temperature of the refrigerating room based on the reduction range of the set temperature calculated by the second fuzzy inference processor, and a set temperature calculated by the freezing room set temperature calculating means. An electric damper control means for controlling the opening and closing of the damper; and a second fan rotation speed determining means for determining the rotation speed of the fan based on the reduction range of the set temperature calculated by the second fuzzy inference processor.
And a fan rotation speed control means for controlling the fan to the rotation speed determined by the second fan rotation speed determination means. 4. The higher rotation speed of the fan among the rotation speed of the fan determined by the first fan rotation speed determination means and the fan rotation speed determined by the second fan rotation speed determination means. A refrigerator / freezer characterized by comprising: a third fan rotation speed determining means for determining the rotation speed; and fan rotation speed control means for controlling the fan to the rotation speed determined by the third fan rotation speed determining means. Control device.