JP3231366B2 - Refrigerator refrigerator control device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigeration refrigerator (hereinafter abbreviated as "refrigerator") in which defrosting is controlled by a control rule based on an empirical rule and a membership function of fuzzy variables constituting the rule. The present invention relates to a control device for a refrigerator-freezer that minimizes an increase in internal temperature and eliminates an influence on food.

[0002]

2. Description of the Related Art A refrigerator-freezer control device operates a fan motor, a compressor, and an electric damper so as to control a freezing room, a refrigerator room, and a vegetable room of a refrigerator at a set temperature. Furthermore, by supplying electricity to the defrost heater, the frost attached to the cooler is removed.
For example, Japanese Patent Publication No. 2-53707, Japanese Patent Publication No. 2-631
No. 53 discloses this.

Hereinafter, a conventional refrigerator-freezer control device will be described with reference to the drawings. FIG. 9 is a block diagram of a control device of a conventional refrigerator-freezer, and FIG. 10 shows a configuration of a conventional refrigerator-freezer. 1 is a refrigerator body, 2 outer boxes
, Inner box 3 and urethane foam insulating material 4 formed in the gap between the two, and three doors 5, 6, 7 at the front opening.
Are arranged. The doors 5, 6, 7 are provided corresponding to the openings of the freezer compartment 8, the refrigerator compartment 9, and the vegetable compartment 10 of the refrigerator body 1, respectively.

[0004] The bottom plate 11 of the freezer compartment 8 and the top plate 12 of the refrigerator compartment 9
A cooling device 13 and a cooling fan 14 behind the cooling device 13 are provided in the partition wall surrounded by. Further, ventilation paths 15 and 16 for introducing the cooling air from the cooler 13 into each chamber are formed in the back of the freezing room 8 and the refrigerator room 9. 17 is a compressor. Reference numeral 18 denotes a freezer compartment door switch that operates by opening and closing the door 5 of the freezer compartment 8, 19 denotes a freezer compartment temperature sensor, and 20 denotes a defrost heater that removes frost adhering to the cooler 13.

[0005] Further, reference numeral 21 denotes a refrigerator internal temperature detecting means for electrically converting the output of the freezer compartment temperature sensor 19 and outputting the converted output.
Reference numeral 22 denotes a compressor operation time integration timer for integrating the operation time of the compressor.

Reference numeral 23 denotes cooling control means. The cooling control means 23 performs cooling control, and turns on the compressor 17 and the cooling fan 14 when the output of the internal temperature detecting means 21 reaches the reference value of the first reference circuit 24, and the second reference circuit When the reference value of 25 is reached, the compressor 17 and the cooling fan 14 are turned on for the time set by the timer 26 when the compressor operation time integration timer 22 reaches the set time and outputs a defrosting start signal.
Thereafter, a defrosting execution signal is output to the defrosting control means 27.

Here, the timer 26 sets the compressor operation time integration timer 22 to the set time, and the internal temperature becomes the second time.
When the reference value of the reference circuit is reached, output is performed for a certain period of time.

When the defrosting execution signal is inputted, the defrosting control means 27 turns on the defrosting heater until the defrosting completion detecting means 28 is inputted, and removes frost attached to the cooler 13.

When the defrosting is completed, the defrosting control means 27 outputs a defrosting control end signal to the cooling control means 23, and the cooling control means 23 resumes the cooling control.

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

First, the in-compartment temperature detecting means 22 detects the temperature of the freezer compartment and compares it with the reference value of the first reference circuit 24 (step 101). When the temperature is low, the compressor 17 and the cooling fan 14 are turned off in step 103. If the temperature is high, step 104
It is determined whether or not the compressor 17 is ON. Step 1 if ON
Proceed to 06.

If the temperature is high in step 101, the compressor 17 and the cooling fan 14
Is turned on, and in step 106, the compressor operation time integration timer 22 integrates the compressor operation time. Next, at step 107, it is determined whether the integration time of the compressor operation time integration timer 22 has reached a set time.

If the set time has not come, the process returns to step 101, and if the set time has come, step 1 is executed.
At 08, the operation of the compressor operation time integration timer 22 is stopped and the contents are initialized, and it is determined whether or not the internal temperature has reached the reference value of the second reference circuit 25. The compressor 17 and the cooling fan 14 are turned on for the time set in Step 110, and Step 110
, The compressor 17 and the cooling fan 14 are turned off.
This is because the inside of the refrigerator rises due to defrosting, so that the inside of the refrigerator is previously cooled to a normal temperature (hereinafter referred to as precool).

Then, in step 111, the defrost heater 2
0 is turned on, and the defrost heater 20 is turned on until the end of the defrost is detected by the defrost end detecting means 29 (step 112). When the process is completed, the defrost heater 20 is turned off in step 113, and the process returns to step 101.

[0015]

However, in the above configuration, the pre-cooling time before the start of defrosting is constant irrespective of the state of the refrigerator (temperature in the refrigerator, heat load of food, etc.). When there are many foods, the pre-cooled heat load is large, so the temperature rise in the refrigerator during defrosting is small, the pre-cooling time is too long and the power increases, and when the food in the refrigerator is small, the pre-cooled heat load is small. For this reason, there has been a problem that the temperature rise in the refrigerator during defrosting is large, and the pre-cooling time is too short and the temperature of the food in the refrigerator rises.

The present invention solves the above problems,
An object of the present invention is to provide a refrigerator-freezer control device that can perform precooling, which is cooling before fine defrosting, by calculating an operation amount according to the heat load of food in a freezer compartment.

[0017]

SUMMARY OF THE INVENTION In order to achieve the above-mentioned object, a refrigerator-freezer control apparatus according to the present invention is designed to perform a normal cooling operation.
, The temperature detected in the freezer compartment by the internal temperature detecting means
If the temperature exceeds the first set temperature, the cooling control means
Run the compressor and operate the compressor
The temperature detected in the freezer compartment by the storage temperature detecting means is
When the temperature falls below a second set temperature lower than the first set temperature,
Next, the temperature detected in the freezer compartment by the inside temperature detecting means.
The cooling control means until the temperature exceeds the first set temperature.
To stop the compressor.
Integration of the compressor from the end of defrosting by the heater
When the operation time reaches a predetermined set time, the freezer compartment
Even if the detected temperature falls below the second set temperature, the cooling
The compressor is forcibly operated by the control means.
After precooling, the cooling control means
Stopping the compressor and defrosting control means
Refrigerator-freezer controller for defrosting by defrost heater
At a predetermined time,
After the fixed time has been reached, the cooling
Is the detected temperature in the freezing chamber below the second set temperature?
Cooling temperature detection that detects the temperature that has dropped during a certain period of time
Means, an outside air temperature detecting means for detecting an outside temperature, and frost.
Experience to find the time to do the pre-cool before taking
A memory for storing a control rule based on the law, and the outside air temperature
Outside temperature detected by the temperature detecting means and the cooling temperature
From the lowered temperature detected by the detecting means and the memory
Based on the extracted control rules, a fuzzy logic
To calculate the pre-cool time before defrosting.
Fuzzy inference processor and fuzzy inference processor
Set the pre-cool time before defrosting based on the calculation result of
A pre-cool time setting means for performing the pre-cool
Based on the pre-cool time set by the time setting means
So that the cooling control means can continue precooling.
It was done.

[0018] Still another control device for a refrigerator according to the present invention.
During normal cooling operation,
If the detected temperature in the freezer compartment exceeds the first set temperature
The compressor is operated by the cooling control means, and the
The cooler is operated by the inside temperature detecting means by the operation of the lesser.
A second detection temperature in the freezing chamber lower than the first set temperature;
When the temperature falls below the set temperature, then the inside temperature detection means
The detected temperature in the freezer room exceeds the first set temperature
Until the cooling control means stops the compressor
In addition, since the last defrost heater
The accumulated operation time of the compressor reaches a predetermined set time.
Then, the detected temperature in the freezer compartment becomes the second set temperature.
Even if the following conditions are satisfied, the compression control means
After performing a pre-cool to force the
The compressor is stopped by the
The defrosting means performs defrosting by the defrost heater.
In the control device of the refrigerator-freezer,
After the accumulated operation time reaches the specified set time,
Cooling temperature detection means for detecting the temperature that has dropped between
Outside air temperature detecting means for detecting the temperature of the
An empirical system for determining the time to perform pre-cool
A memory for storing control rules and the outside air temperature detecting means.
Between the outside air temperature detected by the
Temperature detected and the temperature removed from the memory.
Performs fuzzy logic operation based on the control rules
Fuzzy inference program for calculating the pre-cool time before taking
And the operation result of the fuzzy inference processor.
Pre-cool to set the pre-cool time before defrosting
Time setting means, and the internal temperature detection means
When the detected temperature in the freezer compartment becomes lower than the second set temperature.
And then set by the pre-cool time setting means
Based on the precool time, the cooling control means
This was configured to perform the rule.

[0019]

According to the present invention, with the above-described structure, the integration of the compressor
Detection in freezer compartment after the operation time reaches the set time
Temperature falls below the second set temperature (lower limit of set temperature)
And lowering the temperature was lowered during the predetermined time from, the outside air temperature and <br/>, detecting the amount of thermal load of the food in the refrigerator, on the basis of the control rules in the memory, the fuzzy inference processor fuzzy logic since obtaining the Purikuru time calculation line Do I, Purikuru time according to the thermal load is calculated. Therefore, based on the operation amount obtained by the above, the cooling control means
Ri performed by controlling the compressor Purikuru, then in defrost control means for performing defrosting in the refrigerator by controlling the defrost heater, can be performed Purikuru corresponding to the amount of heat load of the food in the refrigerator, It is possible to prevent a rise in food temperature due to insufficient precooling and an increase in power due to excessive precooling.

Further, the accumulated operation time of the compressor is predetermined.
The temperature of the food in the refrigerator is detected from the temperature drop and the outside air temperature that has dropped during a certain period of time after the set time has been reached ,
Based on the control rules in the memory, the fuzzy inference processor seek Purikuru time I Do line fuzzy logic operation
Than Mel, Purikuru time according to the thermal load is determined, since the inside temperature to set the Purikuru time after reaching the set temperature in addition to the above, can also be a Purikuru time from the set temperature to 0 This allows for more detailed pre-cooling.

[0021]

【Example】

(Embodiment 1) A control device of a refrigerator according to a first embodiment of the present invention will be described below with reference to the drawings. still,
Detailed description of the same parts as in the related art is omitted.

FIG. 1 is a block diagram of a control device of a refrigerator according to a first embodiment of the present invention, and FIG. 2 shows a configuration of the refrigerator. FIG. 3 (I) is a graph showing a membership function of a fuzzy variable with respect to a decrease in temperature after a certain period of time after the internal temperature reaches the set temperature in the first embodiment of the present invention, and FIG. 3 (II) shows the present invention. FIG. 4 is a graph showing a membership function of a fuzzy variable with respect to an outside air temperature in the first embodiment of the present invention. FIG. 4 is a flowchart for explaining the operation in the first embodiment of the present invention.
It is a flowchart for demonstrating the procedure of a fuzzy inference in Example of this.

In FIGS. 1 and 2, reference numeral 29 denotes an outside air temperature sensor for detecting the temperature of the place where the refrigerator is installed.
Reference numeral 30 denotes an outside air temperature detecting means for electrically converting the output of the outside air temperature sensor 29 and outputting the result.

Numeral 31 denotes first cooling temperature detecting means, which is a refrigerator internal temperature detecting means 21, a compressor operating time integrating timer 2
2, the output of the second reference circuit 25 and the output of the cooling time setting timer 32, and the output of the first cooling temperature detecting means 31 is connected to the fuzzy inference processor 33. The first cooling temperature detecting means 31 sets the cooling time setting timer 3 after the compressor operation time integration timer 22 reaches the set time and the internal temperature reaches the reference value of the second reference circuit 25.
The temperature inside the refrigerator when the inside of the refrigerator is cooled for the set time of 2 is detected. Reference numeral 34 denotes a first memory, which stores a control rule based on an empirical rule for obtaining a precool time.

The fuzzy inference processor 33 determines the amount of heat load in the refrigerator which can be detected by the first cooling temperature detecting means 31 and the outside air temperature detecting means 30 based on the control rules retrieved from the first memory 34. A pre-cool time is calculated by performing a fuzzy logic operation.

As shown in FIG. 6, the detection of the heat load in the refrigerator is carried out as shown in FIG. 6 when the already-cooled heat load in the refrigerator is small, the temperature of the refrigerator after cooling for a predetermined time from the reference value of the second reference circuit 25 is reduced. When the already cooled heat load in the refrigerator is large, the decrease in the refrigerator temperature after cooling for a predetermined time from the reference value of the second reference circuit 25 becomes smaller. Further, when the outside air temperature is low, the decrease in the inside temperature is large, and when the outside air temperature is high, the decrease in the inside temperature is small.

Reference numeral 35 denotes a fuzzy inference processor 33.
The output of the first pre-cool time setting means 35 for setting the pre-cool time calculated by the above is connected to the first cooling control means 36. This first cooling control means 3
The reference numeral 6 designates a cooling control.
When the output of the first reference circuit 24 becomes the reference value of the first reference circuit 24, the compressor 17 and the cooling fan 14 are turned on. When the output of the second reference circuit 25 becomes the reference value, the compressor 17 and the cooling fan 14 are turned off. When the set time is reached and a defrosting start signal is output, the compressor 17 and the cooling fan 14 are turned on for a time set by the cooling time setting timer 32 and the first precool time setting means 35, and then a defrosting execution signal is output. It outputs to the defrost control means 27.

When the defrosting execution signal is inputted, the defrosting control means 27 turns on the defrosting heater until the defrosting completion detecting means 28 is inputted, and removes the frost attached to the cooler 13.

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

Here, steps 101 to 108
The operation up to this point is the same as the operation of the control device of the conventional refrigerator-freezer. If it is determined in step 107 that the integration time of the compressor operation time integration timer 22 is the set time, then in step 108, the internal temperature is reduced to the second reference circuit. Turn on the compressor 17 and cooling fan 14 until the reference value of 25 is reached
Then, cool the inside of the refrigerator.

When the internal temperature reaches the reference value of the second reference circuit 25, the routine proceeds to step 114, where the cooling time setting timer 32 operates, and it is determined whether or not the time set by the cooling time setting timer 32 has been reached. Then, when the set time comes, in step 115, the first cooling temperature detecting means calculates and outputs a temperature drop. Then, at step 116, the outside air temperature detecting means 30
To detect the outside air temperature.

Then, the reduced temperature calculated by the first cooling temperature detecting means 31 and the outside air temperature detected by the outside air temperature detecting means 30 are inputted to the fuzzy inference processor 33. The control rule stored in the memory 34 is taken out, the precool time is calculated by fuzzy inference, and the precool time is set in the first precool time setting means 35 (step 117). Then, the compressor 17 and the cooling fan 14 are turned on until the precool time set in step 118 is reached, and the inside of the refrigerator is cooled. Then, when the pre-cooling set time comes, in the same manner as the operation of the conventional refrigerator-freezer control device, the compressor 17
Then, the cooling fan 14 is turned off.

Then, in step 111, the defrost heater 2
0 is turned on, and the defrost heater 20 is turned on until the end of the defrost is detected by the defrost end detecting means 29 (step 112). When the process is completed, the defrost heater 20 is turned off in step 113, and the process returns to step 101.

Here, the fuzzy inference for finding the optimum precool time of the cooler is executed based on the following control rules.

First, in order to obtain the precool time, the first
The control rules adopted in the embodiment are the following nine rules. For example, rule 1: If the temperature drop is small and the outside temperature is low, shorten the pre-cool time.

Rule 2: If the temperature is normal and the outside temperature is low, shorten the precool time a little.・ ・ ・ Rule 5: If the temperature is low and the outside temperature is moderate, set the precool time to normal.・ ・ ・ Rule 9: If the temperature drop is large and the outside temperature is high,
Increase the pre-cool time. And so on.

The reason for this is that if the temperature drop is small, the pre-cooling time may be short because the temperature inside the refrigerator during defrosting is small because the heat load of the pre-cooled heat load is large. This is a rule obtained from experience that the pre-cooling time must be lengthened because the temperature rise inside the refrigerator is large. Therefore, the above language rule is a control rule for a precooling time in which the inventor can perform a precooling in the optimal defrosting control of the cooler, which is obtained from a large number of experimental data. It is as shown in (Table 1).

[0038]

[Table 1]

(Table 1) is a table showing the relationship of the control rules. The temperature T is set in three stages in the horizontal direction (LT = small, MT = low).
Medium, ST = Large), the outside air temperature A is vertically divided into three stages (LA = High, MA = Medium, SA = Low), and the intersection of the above-mentioned reduced temperature and outside air temperature The optimum pre-cooling time corresponding to the temperature drop and the outside air temperature is set in five stages (VLP = long, LP = slightly long, M
P = medium, SP = slightly short, VSP = short).

When the language rules are stored in the first memory 31 of FIG. 1, they are stored according to the following rule. The number of control rules employed in this embodiment is nine.

Rule 1: IF This ST and Ais SA THEN Pis VSP Rule 2: IF This MT and Ais SA THEN Pis SP Rule 5: IF This MT and Ais MA THEP is MP Rule 9: IF Tis LT and A is LA THEN Pis VLP The control rule 1, the rule 2... The rule of the rule 9 is that the drop temperature T, the outside air temperature A, and the precool time P are defined in Table 1. In the case where fine control is performed, the measured temperature drop and the outside air temperature in the middle of each step of the drop temperature T and the outside air temperature A are determined by the antecedent (IF It is necessary to calculate the degree to which the part (1) is satisfied, and estimate the pre-cool time according to the degree. Therefore, in the present embodiment, the degree is calculated using a membership function of a fuzzy variable with respect to the decrease temperature T and the outside air temperature A.

FIG. 3I shows the membership function μST of the fuzzy variables ST, MT and LT with respect to the temperature drop T.
(T), μMT (t), and μLT (t). FIG. 3 (II) shows the fuzzy variable S with respect to the outside air temperature A.
A, MA, LA membership functions μSA (a), μM
A (a) and μLA (a) are shown. The fuzzy inference executed by the fuzzy inference processor 33 performs a fuzzy logic operation using control rules 1, rules 2,..., Rule 9 and the membership functions of FIGS. Do.

Hereinafter, the procedure of fuzzy inference which is step 118 of FIG. 4 will be described with reference to the flowchart of FIG.

In step 120, the fuzzy inference processor 33 uses the fuzzy variable membership function for the reduced temperature t0 and the outside air temperature a0 to reduce the reduced temperature t0.
And the membership value at the outside air temperature a0 (indicated as M value in the figure) is calculated.

In step 121, the obtained reduced temperature t
The degree to which the membership value of the fuzzy variable for 0 and the outside air temperature a0 satisfies the antecedent of each of the nine rules is calculated by the synthesis method as described below.

In the drawing, α is a fuzzy variable for the temperature drop, and β is a fuzzy variable for the outside temperature.

Rule 1: h1 = μST (t0) ∩μSA (a0) = MIN ｛μST (t0), μSA (a0)｝ --- (1) Rule 2: h2 = μMT (t0) ∩μSA (a0) = MIN {μMT (t0), μSA (a0)} --- (2) Expression (1) indicates that the above-mentioned t0 falls in the area ST for the drop temperature T, and the above-mentioned a0 shows the area SA for the outside air temperature A. The proposition to be entered means that the ratio of t0 to LT and the ratio of a0 to LS are satisfied as a smaller value, that is, the antecedent of Rule 1 is satisfied by the ratio of h1. I have. Similarly, in the case of Rule 2 of Expression (2), it indicates that the antecedents are established at the rate of h2.

In step 122, the precool time at the lowered temperature t0 and the outside air temperature a0 is obtained as follows by the membership function of the execution part of the control rule. Using the height method, which is one of the single point methods, the pre-cool time pt0 is expressed by (Equation 1) as the value of the weighted average of the ratios h1, h2,. Calculate as shown.

[0049]

(Equation 1)

Thus, the precool time pt0 is obtained. Therefore, in this embodiment, since the lowered temperature and the outside air temperature are used as the control parameters, fine control is possible. In addition, since the control rules are based on human empirical rules, precooling in the defrosting control of the cooler can be performed in an optimal precooling time. (Embodiment 2) Hereinafter, a control device for a refrigerator-freezer according to a second embodiment of the present invention will be described with reference to the drawings. still,
A detailed description of the same portions as those in the conventional and first embodiments will be omitted.

FIG. 7 is a block diagram of a control device for a refrigerator-freezer according to a second embodiment of the present invention, and FIG. 8 is a flowchart for explaining the operation in the second embodiment of the present invention.

The configuration of the refrigerator-freezer in the second embodiment is the same as that in the first embodiment.

Reference numeral 37 denotes a second cooling temperature detecting means, which is connected to the output of the inside temperature detecting means 21 and the output of the cooling time setting timer 32, and outputs the output of the second cooling temperature detecting means 37 to the fuzzy inference processor 33. It is connected.

The cooling time setting timer 32 is connected to the output of the compressor operating time integrating timer 22. When the compressor operating time integrating timer 22 reaches the set time, the cooling time setting timer 32 operates and the second The cooling temperature detecting means 37 operates the compressor 17 and the cooling fan to cool the inside of the refrigerator, and detects a decrease in the temperature in the refrigerator during the time set by the cooling time setting timer 32.
Reference numeral 38 denotes a second memory, which stores a control rule based on an empirical rule for obtaining a precool time after the internal temperature reaches the set temperature.

The fuzzy inference processor 33 calculates the amount of heat load in the refrigerator which can be detected by the second cooling temperature detecting means 37 and the outside air temperature detecting means 30 based on the control rules retrieved from the second memory 38. A logical operation is performed to calculate a precool time.

As shown in FIG. 6 of the first embodiment, the detection of the heat load in the refrigerator is such that when the already-cooled heat load in the refrigerator is small, the temperature in the refrigerator after cooling for a certain period of time becomes large, When the already-cooled heat load in the refrigerator is large, the decrease in the refrigerator temperature after cooling for a certain period of time becomes smaller. Further, when the outside air temperature is low, the decrease in the inside temperature is large, and when the outside air temperature is high, the decrease in the inside temperature is small.

Reference numeral 39 denotes second pre-cool time setting means for setting a pre-cool time, which is connected to the fuzzy inference processor 33 and the second reference circuit 25, and calculates the pre-cool time calculated by the fuzzy inference processor 33. This signal is output after the internal temperature reaches the reference value of the second reference circuit 25. The output is connected to the second cooling control means 40. The second pre-cool time setting means 39 determines whether the pre-cool time calculated by the fuzzy inference processor 33 and the temperature in the refrigerator are lower than the second reference circuit 25 while the cooling time setting means 32 is operating. This is to correct and output the difference in time after the time becomes equal to or less than the reference value of the second reference circuit 25.

The second cooling control means 40 performs cooling control, and turns on the compressor 17 and the cooling fan 14 when the output of the internal temperature detecting means 21 reaches the reference value of the first reference circuit 24. Is turned off when the value of the second reference circuit 25 is reached, and when the compressor operation time integration timer 22 reaches the set time and outputs a defrosting start signal, the internal temperature becomes the reference value of the second reference circuit 25. After that, the compressor 17 and the cooling fan 14 are turned on for a time set by the second precool time setting means 39, and then a defrosting execution signal is output to the defrosting control means 27.

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

Here, steps 101 to 107
The operation up to this point is the same as the operation of the control device of the conventional refrigerator-freezer.

If it is determined in step 107 that the integration time of the compressor operation time integration timer 22 is the set time, the flow advances to step 130 to set the cooling time setting timer 3
2 operates and the compressor 17 is operated until the set time is reached.
Then, the cooling fan 14 is turned on to cool the inside of the refrigerator.

When the set time has come, step 131 is executed.
Then, the second cooling temperature detecting means 37 calculates and outputs the temperature drop. Then, in step 132, the outside air temperature is detected by the outside air temperature detecting means 30.

Then, the reduced temperature calculated by the second cooling temperature detecting means 37 and the outside air temperature detected by the outside air temperature detecting means 30 are input to the fuzzy inference processor 33. The control rule stored in the memory 38 is taken out, the precool time is calculated by fuzzy inference, and the precool time is set in the second precool time setting means 39 (step 133). Then, in step 134, it is determined whether or not the internal temperature has reached the reference value of the second reference circuit 25, and if it has reached the reference value, the process proceeds to step 135, where the second precool time setting means 39 sets in step 133 The obtained precool time is output to the cooling control means 40. Here, if the internal temperature falls below the second reference circuit 25 while the cooling time setting means 32 is operating, the pre-cool time calculated by the fuzzy inference processor 33 and the internal temperature become the second reference circuit 25. The time difference after the time becomes equal to or less than the reference value is corrected and output.

Then, the second cooling control means 40 turns on the compressor 17 and the cooling fan 14 until the set precool time has elapsed, and cools the inside of the refrigerator. Then, when the pre-cooling set time comes, in the same manner as the operation of the conventional refrigerator-freezer control device, the compressor 17
Then, the cooling fan 14 is turned off.

Then, at step 111, the defrost heater 2
0 is turned on, and the defrost heater 20 is turned on until the end of the defrost is detected by the defrost end detecting means 29 (step 112). When the process is completed, the defrost heater 20 is turned off in step 113, and the process returns to step 101.

Here, the fuzzy inference for finding the optimum precool time of the cooler is executed based on the following control rules.

First, in order to obtain the pre-cool time, the second
The control rules adopted in the second embodiment are the same as those in the first embodiment.

Therefore, in this embodiment, the pre-cooling time is varied from 0 because the compressor operating time integration timer 22 uses the reduced temperature and the outside air temperature after a certain time from the set time as the control parameter. Finer control is possible, and precooling in the defrosting control of the cooler can be performed in an optimal precooling time.

[0069]

As described above, the present invention provides a normal cooling operation.
At the time, the temperature detected in the freezer compartment by the temperature detecting means in the refrigerator.
If the temperature exceeds the first set temperature, the cooling control means
Operate the compressor and operate the compressor
The temperature detected in the freezer compartment by the refrigerator temperature detecting means is
The temperature becomes equal to or lower than a second set temperature lower than the first set temperature.
And then detection of the inside of the freezer compartment by the inside temperature detection means.
Until the temperature exceeds the first set temperature,
The compressor is stopped by the stage and the previous defrost
From the end of defrosting by the heater
When the arithmetic operation time reaches a predetermined set time, the freezing room
Even if the detected temperature of the temperature falls below the second set temperature,
The compressor is forcibly operated by recirculation control means.
After performing pre-cooling, the cooling control means
Turn off the compressor and use the defrost control
Refrigerator-freezer control device for defrosting by the defrost heater
The cumulative operating time of the compressor
After the set time has been reached,
When the detected temperature in the freezer compartment falls below the second set temperature
Cooling temperature detection that detects the temperature that has dropped for a certain period of time
Outlet means, an outside air temperature detecting means for detecting the temperature outside the refrigerator,
A process for determining the time to perform the pre-cool before defrosting
A memory for storing a control rule based on a test rule;
The outside air temperature detected by the temperature detecting means and the cooling temperature
Temperature detected by the temperature detection means,
Fuzzy logic based on the extracted control rules
Calculate and calculate the pre-cool time before defrosting
A fuzzy inference processor and the fuzzy inference processor;
The pre-cooling time before defrosting is set based on the calculation results of
Means for setting a pre-cool time.
The pre-cool time set by the
The cooling control means based on the
With this configuration, the pre-cooling time according to the heat load amount is required, so it is possible to perform the pre-cooling according to the heat load amount of the food in the refrigerator, and the food temperature rise due to insufficient pre-cooling or due to excessive pre-cooling The increase in power can be prevented .

In another embodiment of the present invention, during a normal cooling operation,
In this case, the temperature detected in the freezer compartment by
If the temperature exceeds the first set temperature, the cooling control means controls the temperature.
By operating the presser, the operation of the compressor
The temperature detected in the freezer compartment by the refrigerator temperature detecting means is
When the temperature falls below a second set temperature lower than the first set temperature, the next
The temperature detected in the freezer compartment by the temperature detector in the refrigerator
Until the temperature exceeds the first set temperature.
To stop the compressor.
Operation of the compressor from the end of defrosting
When the rotation time reaches a predetermined set time, the freezing room is checked.
Even if the outlet temperature falls below the second set temperature, the cooling control
Control means for forcibly operating the compressor.
After performing the recooling, the cooling control means controls the cooling.
The presser is stopped and the frost
Refrigerator and refrigerator control device that performs defrosting by the heater
In addition, the integrated operation time of the compressor is set to a predetermined value.
Detects the temperature that has dropped for a certain period of time
Cooling temperature detecting means and the outside air temperature for detecting the temperature outside the refrigerator
The detection means and the time for performing the precooling before defrosting are obtained.
For storing control rules based on empirical rules
And the outside air temperature detected by the outside air temperature detecting means.
And the reduced temperature detected by the cooling temperature detecting means.
And the control rules retrieved from the memory.
And performs a fuzzy logic operation to perform the pre-cooling before defrosting.
Fuzzy inference processor for calculating
Based on the operation results of the inference processor
Pre-cool time setting means for setting the re-cool time
The temperature detected in the freezer compartment by the refrigerator temperature detecting means.
After the temperature drops below the second set temperature,
The pre-cool time set by the
The cooling control means is configured to perform pre-cooling based on
As a result, the pre-cool time can be changed from 0, and the width of the pre-cool time according to the heat load increases, and the pre-cool according to the heat load of the food in the refrigerator further increases. It is possible to prevent an increase in the temperature of food due to insufficient precooling and an increase in power due to excessive precooling.

[Brief description of the drawings]

FIG. 1 is a block diagram of a control device of a refrigerator according to a first embodiment of the present invention;

FIG. 2 is a configuration diagram of a refrigerator-freezer according to the embodiment.

FIG. 3 (I) is a graph showing a membership function of a fuzzy variable with respect to a temperature drop in the embodiment. (II) is a graph showing a membership function of a fuzzy variable with respect to an outside air temperature in the embodiment.

FIG. 4 is a flowchart for explaining the operation in the embodiment;

FIG. 5 is a flowchart for explaining a procedure of fuzzy inference in the embodiment.

FIG. 6 is a diagram showing a relationship between a reduced temperature and an internal load in the embodiment.

FIG. 7 is a block diagram of a control device of a refrigerator according to a second embodiment of the present invention;

FIG. 8 is a flowchart for explaining the operation in the embodiment.

FIG. 9 is a block diagram of a conventional refrigerator-freezer control device.

FIG. 10 is a configuration diagram of a conventional refrigerator-freezer.

FIG. 11 is a flowchart for explaining an operation in a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 19 Freezer compartment temperature sensor 21 Internal temperature detection means 22 Compressor operation time integration timer 25 Second reference circuit 27 Defrost control means 28 Defrost end detection means 29 Outside air temperature sensor 30 Outside air temperature detection means 31 First cooling temperature detection means 32 Cooling time setting means 33 Fuzzy inference processor 34 First memory 35 First precool time setting means 36 First cooling control means 37 Second cooling temperature detecting means 38 Second memory 39 Second precool time setting means 40 Second cooling control means

──────────────────────────────────────────────────続 き Continuation of front page (72) Hideo Hayashi 3-22, Takaidahondori, Higashiosaka-shi, Osaka Matsushita Refrigerator Co., Ltd. (56) References JP-A-2-126083 (JP, A) JP-A Sho 64-79535 (JP, A) JP-A-61-116265 (JP, A) JP-A-2-39203 (JP, A) JP-A-62-62172 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) F25D 11/02 F25D 21/06

Claims (2)

(57) [Claims] (1) During normal cooling operation, the temperature inside the refrigerator is detected.
The temperature detected in the freezer compartment by the discharge means exceeds the first set temperature
Operating the compressor by cooling control means,
Due to the operation of the compressor, the internal temperature detection means
The detected temperature in the freezer compartment is higher than the first set temperature.
When the temperature becomes equal to or lower than the low second set temperature, the inside temperature detection is performed next.
Means for detecting the temperature in the freezer compartment by the first set temperature
Until the compression control means
The defrosting is stopped, and the defrosting by the previous defrosting heater is terminated.
The cumulative operation time of the compressor reaches the specified set time
And the detected temperature in the freezer compartment is equal to or lower than the second set temperature.
The compressor is controlled by the cooling control means.
After performing a pre-cool for forced operation, the cooling system
Control means to stop the compressor and defrost
The control means performs defrosting by the defrost heater.
In the control device of the freezing refrigerator, the accumulated operation time of the compressor reaches a predetermined set time.
After that, the inside of the freezing room is detected by the inside temperature detecting means.
A certain time after the output temperature becomes equal to or lower than the second set temperature
A cooling temperature detecting means for detecting a temperature which has dropped during the period, an outside air temperature detecting means for detecting a temperature outside the refrigerator, and a process for obtaining a time for performing the precooling before defrosting.
A memory for storing a control rule based on a test rule, an outside air temperature detected by the outside air temperature detecting means,
The cooling temperature detected by the cooling temperature detecting means;
Based on the control rules retrieved from memory,
The pre-cooling time before defrosting
A fuzzy inference processor for performing an operation, and before defrosting based on an operation result of the fuzzy inference processor.
Pre-cool time setting hand to set the pre-cool time
And a pre-cooling time set by the pre-cooling time setting means.
The cooling control means continues the pre-cooling based on the cooling time.
A controller for a refrigerator-freezer characterized by being connected to a refrigerator. 2. During normal cooling operation, the temperature inside the refrigerator is detected.
The temperature detected in the freezer compartment by the discharge means exceeds the first set temperature
Operating the compressor by cooling control means,
Due to the operation of the compressor, the internal temperature detection means
The detected temperature in the freezer compartment is higher than the first set temperature.
When the temperature becomes equal to or lower than the low second set temperature, the inside temperature detection is performed next.
Means for detecting the temperature in the freezer compartment by the first set temperature
Until the compression control means
The defrosting is stopped, and the defrosting by the previous defrosting heater is terminated.
The cumulative operation time of the compressor reaches the specified set time
And the detected temperature in the freezer compartment is equal to or lower than the second set temperature.
The compressor is controlled by the cooling control means.
After performing a pre-cool for forced operation, the cooling system
Control means to stop the compressor and defrost
The control means performs defrosting by the defrost heater.
In the control device of the freezing refrigerator, the accumulated operation time of the compressor reaches a predetermined set time.
Cooling temperature that detects the temperature that has dropped during a certain period of time after
After for determining the degree detecting means, and the outside air temperature detection means for detecting a temperature outside the refrigerator, the time for defrosting before the Purikuru
A memory for storing a control rule based on a test rule, an outside air temperature detected by the outside air temperature detecting means,
The cooling temperature detected by the cooling temperature detecting means;
Based on the control rules retrieved from memory,
The pre-cooling time before defrosting
A fuzzy inference processor for performing an operation, and before defrosting based on an operation result of the fuzzy inference processor.
Pre-cool time setting hand to set the pre-cool time
And a temperature detected in the freezer compartment by the internal temperature detecting means.
At the time of the pre-cooling after the temperature becomes lower than the second set temperature
Based on the pre-cool time set by the interval setting means.
The cooling control means performs pre-cooling .