JPH05157439A - Control device for refrigerator - Google Patents

Abstract

PURPOSE:To obtain a control device for a refrigerator which eliminates increased power supply induced by a temperature rise in foodstuffs resultant from the shortage of precooling or an excess in precooling by carrying out precooling directly prior to defrosting operation, responding to a thermal load of foodstuffs in the refrigerator which stores foodstuffs. CONSTITUTION:An inside temperature is detected with an inside temperature direction means 21. When a compressor operation time estimated timer 22 reaches a setting time, a first cooling temperature detection means 31 detects a drop temperature to be cooled within an actuation time of a cooling time setting timer 32 from the inside temperature reaches a reference value of a second reference circuit 25. From the drop time and the open air temperature detected with the open air temperature detection means 30, fuzzy logical operation is carried out by means of a fuzzy inference processor 33 based on a control rule fetched from a first memory 34 so as to decide a precooling end time. Then, the precooling end time is set with a first precooling end temperature setting means 35.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting control of a refrigerator / freezer (hereinafter referred to as a refrigerator) based on an empirical rule and a fuzzy variable membership function forming the control rule. The present invention relates to a refrigerator-freezer control device that minimizes an increase in internal temperature and eliminates the influence on food.

[0002]

2. Description of the Related Art A control device for a refrigerator / freezer operates a fan motor, a compressor and an electric damper so as to control each of a refrigerator compartment, a refrigerator compartment and a vegetable compartment of a refrigerator at a set temperature. Furthermore, by energizing the defrost heater, it removes the frost adhering to the cooler,
For example, Japanese Patent Publication No. 2-53707 and Japanese Patent Publication No. 2-631.
No. 53 publication.

A conventional control device for a refrigerator-freezer will be described below with reference to the drawings. FIG. 9 is a block diagram of a conventional refrigerator-freezer control device, and FIG. 10 shows a configuration of a conventional refrigerator-freezer. 1 is a refrigerator body, and an outer box 2
And the inner box 3 and the urethane foam heat insulating material 4 formed in the space between the two, and three doors 5, 6, 7 are provided in the front opening.
Are arranged. The doors 5, 6, and 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
Inside the partition wall surrounded by, there is a cooler 13 and a cooling fan 14 behind it. Further, ventilation paths 15 and 16 for introducing cooling air from the cooler 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. Reference numeral 18 is a freezer compartment door switch that operates by opening and closing the door 5 of the freezer compartment 8, 19 is a freezer compartment temperature sensor, and 20 is a defrosting heater that removes frost adhering to the cooler 13.

Further, reference numeral 21 is an in-compartment temperature detecting means for electrically converting the output of the freezer compartment temperature sensor 19 and outputting it.
Reference numeral 22 is a compressor operation time integration timer that integrates the operation time of the compressor.

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

Here, the timer 26 is set to the compressor operating time integration timer 22 and the internal temperature is the second time.
When the reference value of the reference circuit is reached, the output is performed for a fixed time.

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

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 restarts the cooling control.

The operation of the refrigerator-refrigerator control apparatus configured as described above will be described below with reference to the flowchart of FIG.

First, the inside 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). If the temperature is low, the reference value of the second reference circuit 25 is used. If 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
If it is OFF, it is judged whether the compressor 17 is ON, and the process returns to step 101. If it is ON, step 1
Proceed to 06.

If the temperature is high in step 101, the compressor 17 and the cooling fan 14 are operated in step 105.
Is turned on, and in step 106, the compressor operation time integration timer 22 integrates the operation time of the compressor. Next, at step 107, it is judged whether the integration time of the compressor operation time integration timer 22 has reached the set time. If the set time has not come, the process returns to step 101, and if the set time has come, the integration of the compressor operating time integration timer 22 is stopped and the contents are initialized in step 108, and the internal temperature is set to the second reference circuit 25. If it is the reference value, the compressor 17 and the cooling fan 14 are turned on for the time set by the timer 26 in step 109, and the compressor 17 and the cooling fan 14 are turned off in step 110. .. This is because the temperature inside the refrigerator is increased by defrosting, so that the inside of the refrigerator is cooled to a normal temperature in advance (hereinafter referred to as precool).

Then, in step 111, the defrosting heater 2
0 is turned on, and the defrosting heater 20 is turned on until the defrosting completion detecting means 29 detects the completion of defrosting (step 112). Then, when it is finished, the defrosting heater 20 is turned off in step 113, and the process returns to step 101.

[0014]

However, in the above configuration, the pre-cooling before the start of defrosting is constant irrespective of the state of the inside of the refrigerator (internal temperature, heat load of food, etc.). If there is a lot of food, the heat load of the pre-cooled is large, so the temperature rise in the refrigerator during defrosting is small, the pre-cooling is too long, and the electricity is increased. The temperature rise in the chamber during defrosting is large,
The precool is too short and has a problem that the temperature of the food in the refrigerator rises.

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

[0016]

In order to achieve the above object, a control device for a refrigerator / freezer of the present invention is a refrigerator / freezer capable of freezing or refrigerating and storing food, and a freezer compartment provided in the freezing compartment. A temperature sensor, an inside temperature detecting means for detecting the inside temperature of the freezing room by the freezing room temperature sensor, and a cooling temperature detecting means for detecting a temperature lowered within a certain time after the inside temperature reaches a set temperature. An outside air temperature detecting means for detecting the temperature outside the refrigerator, a memory for storing a control rule based on an empirical rule for obtaining the precool end temperature, an outside air temperature detected by the outside air temperature detecting means, and a cooling temperature detecting means Fuzzy inference processor that calculates the precool end temperature by performing fuzzy logic operation based on the temperature decrease detected by the controller and the control rule retrieved from the memory A precool end temperature setting means for setting the precool end temperature calculated by the fuzzy inference processor, an output of the internal temperature detection means, and a cooling control means for driving the compressor and the cooling fan by the output of the precool end temperature setting means. The defrosting control means controls the energization of the defrosting heater, detects the temperature of the cooler, and outputs the defrosting termination signal to output defrosting termination signal when the temperature reaches a constant temperature.

As another configuration, a freezer compartment temperature sensor provided in the freezer compartment, a compartment interior temperature detecting means for detecting the compartment interior temperature in the refrigeration compartment by the freezer compartment temperature sensor, and a compartment interior temperature for a predetermined time. Cooling temperature detecting means for detecting the temperature that has dropped to the outside, outside air temperature detecting means for detecting the temperature outside the refrigerator, and a control rule based on an empirical rule for obtaining the precool end temperature after the inside temperature reaches the set temperature. A memory for storing, and the outside air temperature detected by the outside air temperature detecting means,
Based on the lowered temperature detected by the cooling temperature detection means and the control rule fetched from the memory, the fuzzy logic operation is performed to calculate the precool end temperature, and the precool end temperature calculated by the fuzzy inference processor is calculated. , A pre-cool end temperature setting means for setting after the internal temperature reaches the set temperature, an output of the internal temperature detection means, a cooling control means for driving the compressor and the cooling fan by the output of the pre-cool end temperature setting means, and defrosting The defrosting control means controls the energization of the heater, detects the temperature of the cooler, and outputs a defrosting completion signal to output defrosting completion signal when the temperature reaches a constant temperature.

[0018]

According to the present invention, the amount of heat load of the food in the refrigerator is detected from the lower temperature after a predetermined time from the set temperature detected by the cooling temperature detecting means and the outside air temperature detected by the outside air temperature detecting means. However, since the fuzzy inference processor performs a fuzzy logic operation based on the control rule in the memory, the precool end temperature corresponding to the heat load amount can be obtained.

Therefore, based on the operation amount obtained above, the cooling fan and the compressor are controlled by the cooling control means to perform precooling, and then the defrosting control means is used.
By controlling the defrost heater to defrost the inside of the refrigerator, it is possible to perform precooling according to the amount of heat load on the food in the refrigerator, increasing the temperature of the food due to insufficient precooling and increasing power due to excessive precooling. Can be prevented.

Further, the heat load of the food in the refrigerator is detected from the lowered temperature after a fixed time from the temperature when the compressor operating time integration timer reaches the set time and the outside air temperature detected by the outside air temperature detecting means, Since the fuzzy inference processor performs fuzzy logic operation based on the control rule in the memory, the precool end temperature according to the heat load amount is obtained, and the precool end temperature is set after the internal temperature reaches the set temperature. In addition to the above, it is also possible to set the pre-cool from the set temperature to 0, and more detailed pre-cool can be performed.

[0021]

【Example】

(Embodiment 1) Hereinafter, a control device for a refrigerator-freezer according to a first embodiment of the present invention will be described with reference to the drawings. still,
Detailed description of the same parts as the conventional one will be omitted.

FIG. 1 is a block diagram of a control device for a refrigerator / freezer according to a first embodiment of the present invention, and FIG. 2 shows a structure of the refrigerator / freezer. FIG. 3 (a) is a graph showing a membership function of a fuzzy variable with respect to the temperature drop after a certain time has elapsed since the internal temperature reached the set temperature in the first embodiment of the present invention, and FIG. 3 (b) shows the present invention. Of the fuzzy variable membership function with respect to the outside temperature in the first embodiment of FIG. 4, FIG. 4 is a flow chart for explaining the operation in the first embodiment of the present invention, and FIG. 5 is the first embodiment of the present invention.
5 is a flowchart for explaining a fuzzy inference procedure in the embodiment of FIG.

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

Reference numeral 31 is a first cooling temperature detecting means, which is an inside temperature detecting means 21, a compressor operating time integrating timer 2
2, the output of the second reference circuit 25 and 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. In the first cooling temperature detecting means 31, the cooling time setting timer 3 is set after the compressor operating time integration timer 22 reaches the setting time and the internal temperature reaches the reference value of the second reference circuit 25.
The temperature inside the refrigerator is detected when the inside of the refrigerator is cooled for the set time of 2.

Reference numeral 34 denotes a first memory, which stores a control rule based on an empirical rule for obtaining the precool end temperature. The fuzzy inference processor 33 calculates 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 rule fetched from the first memory 34, by fuzzy logic operation. The pre-cool end temperature is calculated.

As shown in FIG. 6, the detection of the heat load in the cold storage lowers the cold storage temperature after cooling for a certain time from the reference value of the second reference circuit 25 when the already cooled heat load in the cold storage is small. Becomes large, and when the already-cooled heat load in the refrigerator is large, the decrease in the temperature inside the refrigerator after cooling for a certain time from the reference value of the second reference circuit 25 becomes small. 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.

Further, 35 is a fuzzy inference processor 33.
The output of the first precool end temperature setting means 35 for setting the precool end temperature calculated by the above is connected to the first cooling control means 36. The first cooling control means 36 performs cooling control. When the output of the internal temperature detection means 21 reaches the reference value of the first reference circuit 24, the compressor 17 and the cooling fan 14 are turned on, and the second When it becomes the reference value of the reference circuit 25,
If the compressor operating time integration timer 22 reaches the set time and outputs the defrosting start signal, the cooling time setting timer 32
Of the compressor 17 until the cooling end temperature set by the first precool end temperature setting means 35 is reached.
Then, the cooling fan 14 is turned on, and then a defrosting execution signal is output to the defrosting control means 27.

When the defrosting execution signal is input, the defrosting control means 27 turns on the defrosting heater to remove the frost on the cooler 13 until the defrosting completion detecting means 28 is input.

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

Here, step 101 to step 108
The above is the same as the operation of the conventional control device for the refrigerator / freezer, and if it is determined in step 107 that the integrated time of the compressor operating time integration timer 22 is the set time, the internal temperature of the refrigerator is determined to be the second reference circuit in step 108. Turn on the compressor 17 and the cooling fan 14 until the reference value of 25 is reached.
Then, cool the interior.

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 judged whether or not the setting time of the cooling time setting timer 32 has been reached. When the set time has come, in step 115 the first cooling temperature detecting means calculates and outputs the temperature decrease. Then, in step 116, the outside air temperature detecting means 30
Detects the outside air temperature.

Then, the lowered 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, and the fuzzy inference processor 33 preliminarily outputs the first temperature. The control rule stored in the memory 34 is taken out, and the precool end temperature is calculated by fuzzy inference,
The pre-cool end temperature is set in the pre-cool end temperature setting means 35 (step 117). And step 11
The compressor 17 and the cooling fan 14 are turned on until the precool end temperature set in 8 is reached, and the inside of the refrigerator is cooled. Then, when the pre-cool set time is reached, in the same way as the operation of the conventional refrigerator-freezer control device, step 110
Then, the compressor 17 and the cooling fan 14 are turned off.

Then, in step 111, the defrosting heater 2
0 is turned on, and the defrosting heater 20 is turned on until the defrosting completion detecting means 29 detects the completion of defrosting (step 112). Then, when it is finished, the defrosting heater 20 is turned off in step 113, and the process returns to step 101.

Here, the fuzzy inference for obtaining the optimum precool end temperature of the cooler is executed based on the following control rule.

First, in order to obtain the precool end temperature,
The control rules adopted in the first embodiment are the following nine rules. Rule 1: For example, if the temperature drop is small and the outside temperature is low,
Increase the precool end temperature. Rule 2: If the temperature is low and the outside temperature is low,
Increase the precool end temperature slightly.

Rule 5: If the temperature drop is normal and the outside air temperature is moderate, set the pre-cool end temperature to normal.

Rule 9: If the temperature drop is large and the outside air temperature is high,
Lower the precool end temperature. Etc.

This is because if the temperature decrease is small, the heat load of already cooled is large and the temperature rise in the chamber during defrosting is small. Therefore, the precool end temperature may be high, and if the outside air temperature is high, the defrosting may be high. This is a rule obtained from experience that the precool end temperature must be lowered because the inside temperature rises significantly.

Therefore, the above-mentioned language rule is a control rule for the precool end temperature that can be precooled in the optimum defrosting control of the cooler, which is obtained from a large amount of experimental data by the inventor. It is as shown in Table 1 in terms of temperature.

[0040]

[Table 1]

(Table 1) is a table showing the relationship of the control rules, in which the lowering temperature T is three steps in the lateral direction (LT = small, MT =).
Middle, ST = Large), and the outside air temperature A is divided into three stages (LA = High, MA = Medium, SA = Low) in the vertical direction, and the lowering temperature and the outside air temperature are classified. The optimum precool end temperature corresponding to the lowering temperature and the outside air temperature is arranged at five positions (VLP = long, LP = a little long, MP = medium, SP = a little short, VSP = short). ..

Further, when the language rule is stored in the first memory 31 of FIG. 1, it is stored according to the following rule rule. The control rules adopted in this embodiment are nine. Rule 1: IF T is ST and A is SA THEN P is VSP Rule 2: IF T is MT and A is SA THEN P is SP ・ ・ Rule 5: IF T is MT and A is MA THEN P is MP ・ ・ Rule 9: IF T is LT and A is LA THEN P is VLP The control rule 1, rule 2 ... The rule 9 is the lower temperature T, the outside air temperature A, and the precool end temperature P as shown in (Table 1). Since it is determined in stages, when performing fine control, the antecedent part (IF part) of the control rule is used for the actually measured lowering temperature and the outside air temperature in the middle of each stage of the lowering temperature T and the outside air temperature A. It is necessary to calculate the degree to which the pre-cooling end temperature is satisfied and estimate the precool end 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 lowered temperature T and the outside air temperature A.

FIG. 3A shows the membership function μST of the fuzzy variables ST, MT, LT with respect to the temperature drop T.
(T), μMT (t), μLT (t) are shown, and FIG. 3B shows a fuzzy variable S with respect to the outside air temperature A.
Membership functions of A, MA, LA μSA (a), μM
A (a) and μLA (a) are shown. The fuzzy inference executed by the fuzzy inference processor 33 uses a control rule 1, a rule 2 ... Rule 9 and a membership function of FIGS. 3A and 3B to perform a fuzzy logic operation to calculate an operation amount. To do.

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

In step 120, the fuzzy inference processor 33 uses the membership function of the fuzzy variable for the lowered temperature t0 and the outside air temperature a0 to reduce the lowered 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 lowered temperature t
The degree to which the membership value of the fuzzy variable with respect to 0 and the outside air temperature a0 satisfies the antecedent part of each of the nine rules is calculated by the synthesizing method as follows.

In the figure, the fuzzy variable for the lowered temperature is indicated by α, and the fuzzy variable for the outside air temperature is indicated by β.

[0048]

[Equation 1]

[0049]

[Equation 2]

(Equation 1) is a proposition that t0 is in the region ST for the lowered temperature T and a0 is in the region SA for the outside air temperature A. The ratio of t0 to LT and a0 are It means that a small value of the ratio of entering the LS is satisfied, that is, the antecedent part of rule 1 is satisfied at the ratio of h1. Similarly, in the case of Rule 2 of (Equation 2), the antecedent part is satisfied at a rate of h2.

In step 122, the precool end temperature at the lowered temperature t0 and the outside air temperature a0 is determined by the membership function of the execution part of the control rule as follows. The precool end temperature pt0 is a weighted average value of the proportions h1, h2, ... H9 in which the antecedent part of each control rule is satisfied, using the height method which is one of the one-point conversion methods.
It is calculated as shown in (Equation 3).

[0052]

[Equation 3]

As a result, the precool end temperature pt0 is obtained. Therefore, in this embodiment, since the lowering temperature and the outside air temperature are used as the control parameters, fine control is possible. Further, since the control rule is based on human experience, precooling can be performed in the defrosting control of the cooler at the optimum precooling end temperature. (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,
Detailed description of the same parts as those of the prior art and the first embodiment will be omitted.

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

The structure of the refrigerator / freezer in the second embodiment is the same as that in the first embodiment.

The second cooling temperature detecting means 37 is connected to the outputs of the inside temperature detecting means 21 and the cooling time setting timer 32, and the output of the second cooling temperature detecting means 37 is sent to the fuzzy inference processor 33. It is connected.

Further, the cooling time setting timer 32 is connected to the output of the compressor operating time integrating timer 22, and when the compressor operating time integrating timer 22 reaches the setting 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 inside temperature during the set time of the cooling time setting timer 32. Three
A second memory 8 stores a control rule based on an empirical rule for obtaining the precool end temperature after the internal cold storage temperature reaches the set temperature.

The fuzzy inference processor 33 determines 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 rule fetched from the second memory 38. The precool end temperature is calculated by performing a logical operation.

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

Further, 39 is a second precool end temperature setting means for setting the precool end temperature, which is connected to the fuzzy inference processor 33 and the second reference circuit 25, and is calculated by the fuzzy inference processor 33. The end temperature 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. Further, the second pre-cool end temperature setting means 39, if the internal cold storage temperature becomes equal to or lower than the second reference circuit 25 while the cooling time setting means 32 is operating, the pre-cool end temperature calculated by the fuzzy inference processor 33 and the internal cold storage The time difference after the temperature becomes equal to or lower than the reference value of the second reference circuit 25 is corrected and output.

The second cooling control means 40 performs cooling control. When the output of the internal temperature detection means 21 reaches the reference value of the first reference circuit 24, the compressor 17 and the cooling fan 14 are turned on. When the compressor operating time integration timer 22 reaches the set time and outputs the defrosting start signal, the inside temperature is the reference value of the second reference circuit 25. After that, the compressor 17 and the cooling fan 14 are turned on up to the temperature set by the second precool end temperature setting means 39,
After that, the defrosting execution signal is output to the defrosting control means 27.

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

Here, step 101 to step 107
Up to the above, the operation is the same as that of the control device of the conventional refrigerator-freezer.

If it is determined in step 107 that the integrated time of the compressor operating time integration timer 22 is the set time, the process proceeds to step 130 and the cooling time setting timer 3
2 operates and the compressor 17
Also, the cooling fan 14 is turned on to cool the inside of the refrigerator.

When the set time is reached, step 131
Then, the second cooling temperature detecting means 37 calculates and outputs the temperature decrease. Then, in step 132, the outside air temperature detecting means 30 detects the outside air temperature.

Then, the lowered 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, and the fuzzy inference processor 33 preliminarily outputs the second temperature. The control rule stored in the memory 38 is taken out, the precool end temperature is calculated by fuzzy reasoning, and the second
The precool end temperature is set in the precool end temperature setting means 39 (step 133). And step 13
In step 4, it is judged whether 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, and the second precool end temperature setting means 39 is set in step 133. The precool end temperature is output to the cooling control means 40. Here, when the internal cold storage temperature becomes equal to or lower than the second reference circuit 25 during the operation of the cooling time setting means 32, the precool end temperature and the internal cold storage temperature calculated by the fuzzy inference processor 33 are the second basic reference circuit 25. The difference in time after it becomes less than the reference value of 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 end temperature is reached, and cools the inside of the refrigerator. Then, when the pre-cool set time is reached, the compressor 17 and the cooling fan 14 are turned off in step 110, as in the operation of the control device of the conventional refrigerator-freezer.

Then, in step 111, the defrosting heater 2
0 is turned on, and the defrosting heater 20 is turned on until the defrosting completion detecting means 29 detects the completion of defrosting (step 112). Then, when it is finished, the defrosting heater 20 is turned off in step 113, and the process returns to step 101.

Here, the fuzzy inference for obtaining the optimum precool end temperature of the cooler is executed based on the following control rule.

First, in order to obtain the precool end temperature,
The control rule adopted in the second embodiment is the same as that in the first embodiment.

Therefore, in this embodiment, the precool is variable from 0 because the lowering temperature and the outside air temperature after a fixed time after the compressor operating time integration timer 22 reaches the set time are used as the control parameters. Finer control is possible, and precooling can be performed in the defrosting control of the cooler at the optimum precooling end temperature.

[0072]

As described above, the present invention provides a freezer-refrigerator capable of freezing or refrigerating food and storing it.
The freezing room temperature sensor provided in the freezing room, the indoor temperature detecting means for electrically converting and outputting the internal room temperature in the freezing room by the freezing room temperature sensor, and the operating time of the compressor are integrated to calculate the operating time. A compressor operation time integration timer that outputs a signal when the set time is reached, and a cooling temperature detection means that detects a temperature that has dropped within a certain time after the internal temperature reaches the set temperature by the signal of the compressor operation time integration timer. , An outside air temperature detecting means for detecting a temperature outside the refrigerator, a memory for storing a control rule based on an empirical rule for obtaining a cooling end temperature before defrosting, an outside air temperature detected by the outside air temperature detecting means, and a cooling Based on the lowered temperature detected by the temperature detection means and the control rule fetched from the memory, fuzzy logic operation is performed to calculate the cooling end temperature before defrosting. And a fuzzy inference processor,
Precool end temperature setting means for setting the cooling end temperature before defrosting calculated by the fuzzy inference processor,
Cooling control means that drives the compressor and cooling fan by the output of the internal temperature detection means and the output of the pre-cool end temperature setting means, and the energization of the defrosting heater is controlled to detect the temperature of the cooler and defrost when a certain temperature is reached. Since the pre-cooling end temperature according to the heat load amount is obtained because it is equipped with the defrosting control means for ending the defrosting by the output of the defrosting end detection means for outputting the end signal, the amount of heat load of the food in the refrigerator According to the pre-cooling, it is possible to prevent the temperature of food from rising due to lack of pre-cooling and the increase in electricity due to excessive pre-cooling.

In a freezer-refrigerator having a different structure for freezing or refrigerating and storing food, the freezer compartment temperature sensor provided in the freezer compartment and the freezer compartment temperature sensor are used to determine the temperature inside the refrigerator compartment. The internal temperature detection means that electrically converts and outputs the operation time of the compressor, and the compressor operation time integration timer that outputs the signal when the operation time reaches the set time and the signal of the compressor operation time integration timer Cooling temperature detection means for detecting the temperature inside the refrigerator has decreased during a certain period of time, outside air temperature detection means for detecting the temperature outside the refrigerator, and control based on empirical rules for determining the cooling end temperature before defrosting The memory for storing the rules, the outside air temperature detected by the outside air temperature detecting means, the lowered temperature detected by the cooling temperature detecting means, and the Based on the control rule, the fuzzy logic operation is performed to calculate the cooling end temperature after the internal temperature reaches the set temperature before the defrosting, and the cooling before defrosting calculated by the fuzzy inference processor. Precool end temperature setting means for setting the end temperature after the internal temperature reaches the set temperature, output of the internal temperature detection means, and cooling control means for driving the compressor and the cooling fan by the output of the precool end temperature setting means. It is equipped with defrosting control means that controls the energization of the defrosting heater, detects the temperature of the cooler, and outputs a defrosting termination signal when the temperature reaches a constant temperature, and defrosting control means that terminates defrosting by the output of the defrosting termination means. It is possible to change from 0, and the width of the precool end temperature corresponding to the heat load amount becomes wider, Purikuru can be performed in accordance with the amount of food heat load in the refrigerator of the layer, it is possible to prevent the temperature rise and the food by Purikuru insufficient, the increasing electrostatic by too Purikuru.

[Brief description of drawings]

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

FIG. 2 is a configuration diagram of a refrigerator-freezer in the same embodiment.

3A is a graph showing a membership function of a fuzzy variable with respect to a decrease temperature in the same embodiment. FIG. 3B is a graph showing a membership function of a fuzzy variable with respect to an outside air temperature in the same embodiment.

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

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

FIG. 6 is a characteristic diagram showing the relationship between the temperature drop and the internal load in the same embodiment.

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

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

FIG. 9 is a block diagram of a conventional controller for a refrigerator-freezer.

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

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

[Explanation of symbols]

 19 Freezing room temperature sensor 21 Inside temperature detection means 22 Compressor operating time integration timer 25 Second reference circuit 27 Defrosting control means 28 Defrosting completion detecting means 29 Outside air temperature sensor 30 Outside air temperature detecting means 31 First cooling temperature detecting means 32 Cooling time setting means 33 Fuzzy inference processor 34 First memory 35 First precool end temperature setting means 36 First cooling control means 37 Second cooling temperature detection means 38 Second memory 39 Second precool end temperature setting Means 40 Second cooling control means

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Shigeru Mori 3-22, Takaidahondori, Higashiosaka-shi, Osaka Prefecture Matsushita Cold Machinery Co., Ltd.

Claims (2)

[Claims] 1. A freezer-refrigerator capable of freezing or refrigerating and storing foods, wherein a freezer compartment temperature sensor provided in the freezer compartment and the freezer compartment temperature sensor electrically convert a compartment temperature in the freezer compartment. The internal temperature detection means for outputting the internal temperature of the refrigerator and the compressor operating time integration timer that integrates the operating time of the compressor and outputs a signal when the operating time reaches the set time Cooling temperature detecting means to detect the temperature that has dropped for a certain time after reaching the set temperature, outside air temperature detecting means to detect the temperature outside the refrigerator, and an empirical rule for determining the cooling end temperature before defrosting A memory for storing a control rule based on the above, an outside air temperature detected by the outside air temperature detecting means, a lowered temperature detected by the cooling temperature detecting means, and A fuzzy inference processor that performs a fuzzy logic operation to calculate a cooling end temperature before defrosting, and a cooling end temperature before defrosting calculated by the fuzzy inference processor are set based on the control rule extracted from the memory. Precool end temperature setting means, the output of the inside temperature detection means, the cooling control means for driving the compressor and the cooling fan by the output of the precool end temperature setting means, the energization of the defrost heater to control the temperature of the cooler. A control device for a refrigerator / freezer, comprising: a defrosting control unit that terminates defrosting by the output of a defrosting completion detecting unit that outputs a defrosting completion signal when detected and reaches a constant temperature. 2. A freezer-refrigerator capable of freezing or refrigerating and storing food, and electrically converting the freezer compartment temperature sensor provided in the freezer compartment and the refrigerator interior temperature by the freezer compartment temperature sensor. The internal temperature detection means for outputting the internal temperature of the refrigerator and the compressor operating time integration timer that integrates the operating time of the compressor and outputs a signal when the operating time reaches the set time Cooling temperature detection means that detects the temperature that has decreased over a certain period of time, outside air temperature detection means that detects the temperature outside the refrigerator, and control rules based on empirical rules for determining the end temperature of cooling before defrosting are stored. Memory and
Based on the outside air temperature detected by the outside air temperature detecting means, the lowered temperature detected by the cooling temperature detecting means, and the control rule taken out from the memory, a fuzzy logic operation is performed to defrost the inside temperature of the warehouse. A fuzzy inference processor that calculates the cooling end temperature after reaching the set temperature, and a precool end temperature that outputs the cooling end temperature before defrosting calculated by the fuzzy inference processor after the internal temperature reaches the set temperature Setting means, the output of the inside temperature detecting means, the cooling control means for driving the compressor and the cooling fan by the output of the pre-cool end temperature setting means, the energization of the defrosting heater is controlled, the temperature of the cooler is detected and fixed. Defrosting control that terminates defrosting by the output of the defrosting completion detecting means that outputs a defrosting completion signal when the temperature reaches Control device for refrigerator, characterized in that it comprises a stage.