JPH0599554A - Defrosting controller of refrigerator - Google Patents

Abstract

PURPOSE:To start defrosting in a time band in which the frequency of opening and closing of the door is small and thereby prevent a rise in the temperature of a storage chamber in defrosting by detecting the number of times of opening and closing of the door in each time band and, on the other hand, making cumulative counting of the time of compressor operation and judging the start of frosting action based on them. CONSTITUTION:In the main body of the subject refrigerator, a storage chamber 2 is cooled by a cooling device 3 and, at the same time, the coolant is supplied to the cooling device 3 from a compressor 4 that constitute a refrigerating cycle. In this case, the openings and closings of the door in the storage chamber 2 are detected by a detector 5. On the other hand in the central processing unit 6, the time of operation of the compressor 4 is cumulatively calculated by a cumulative calculation section 7 and, at the same time, the number of times of door openings and closings that is detected is counted by a counting section 8. And the counted value is converted, and it is stored in an opening and closing frequency memory 12 as a door opening and closing index. Further, based on the cumulative calculation data and the opening and closing index, the starting of defrosting is judged by a judging section 15. And, in the time band in which the door opening and closing frequency is small, the defrosting is started. With this arrangement a rise in the temperature of the storage chamber during defrosting is prevented simply and surely.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a defrosting control device for a refrigerator which performs defrosting during a time period when a door is not opened / closed frequently.

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2. Description of the Related Art Japanese Utility Model Publication 55-7795 prior to the present invention
In the conventional defrosting device for a refrigerator described in Japanese Patent Laid-Open Publication No. 2003-242242, the operating time of the refrigeration cycle is integrated by a timer and the cooler is defrosted when the refrigeration cycle is operated for a predetermined time.

However, in the defrosting apparatus of this type of refrigerator, when the defrosting is arbitrarily started by the timer and the defrosting is started during a time period when the door of the storage room is frequently opened and closed, the storage room is There is a drawback in that outside air frequently enters in a state where cooling is not possible, leading to a rise in room temperature.

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DISCLOSURE OF THE INVENTION The present invention solves the above-mentioned drawbacks and provides a defrosting control device for a refrigerator capable of reliably preventing the temperature rise of the storage chamber during defrosting with a simple structure. is there.

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DISCLOSURE OF THE INVENTION The present invention is one in which a refrigerator cooler supplied with a refrigerant by a compressor is intermittently defrosted, and one day is divided into a plurality of time zones, and each time is divided into a plurality of time zones. Detecting the number of times the refrigerator door is opened and closed for each band, storing it in the opening / closing frequency memory as a door opening / closing index, and inputting the door opening / closing index and the accumulated data of the operating time of the compressor to the defrosting operation start determination unit. Then, defrosting is started in a time period when the door opening / closing frequency is low, and the door opening / closing index is I _{N + 1} = N + a * _IN (where N is the door opening / closing index on the renewal day, and a is constant up to 0 to 1, I _N is the day before the door opening and closing index, and updates by performing the calculation of I N _{+ 1} is the door opening and closing index renewal date.), for each time slot, the day before The difference between the average number of times of opening and closing the door on the update day is detected, and this difference is the predetermined value. Only for the lower and the door opening and closing index I _{N + 1} made of updated and stored in the storage unit of the true index.

[0006]

According to the present invention, the defrosting can be performed during a time period when the door is opened and closed less frequently, so that the door is frequently opened and closed while the storage chamber cannot be cooled. It is possible to prevent abnormal temperature rise.

Further, the door opening / closing index is expressed by the above formula, I _{N + 1} = N
+ A * it is so arranged to update by performing the calculation of I _N, further the start timing of the defrosting operation in response to the recent door opening and closing frequency trend is possible precisely, the structure for the update, for example, Unlike the case of updating based on the average value of a plurality of past days, the storage memory amount for a plurality of days is unnecessary, and the configuration can be easily made with only the memory capacity for one day.

Further, for each time period, the difference between the average number of times of opening and closing the door until the previous day is detected, and the door opening / closing index I _{N + 1} is calculated only when the difference is less than a predetermined value. Since the true index is updated and stored in the storage unit, if the number of times of opening and closing the door on the update date suddenly increases or decreases, the door opening and closing index I _{N + 1} including the sudden data is stored as the true index. It is no longer updated or stored in the section, and therefore the door opening / closing index can be maintained at the true average value without being adversely affected by the number of times the door is opened / closed abruptly. You will be able to frost.

[0009]

Next, an embodiment of the present invention will be described.

In FIG. 1, reference numeral 1 is a refrigerator main body, which is provided with a storage chamber 2 and which is cooled by a cooler 3. Four
Is a compressor forming a part of the refrigeration cycle, and the refrigerant is supplied from the compressor 4 to the cooler 3. Reference numeral 5 is a door opening / closing detector for detecting opening / closing of the door of the storage chamber 2.

Reference numeral 6 denotes a microprocessor as a central processing unit, which includes a compressor operating time integrating section 7 for integrating the operating time of the compressor 4, and a counting section 8 for counting the number of times of opening / closing detected by the door opening / closing detector 5. have. Further, the microprocessor 6 is a sudden phenomenon determination unit 9
And a new index selection unit 10 and an average door opening / closing frequency updating unit 11
a and an opening / closing index updating unit 11b. These will be described later.

Reference numeral 12 denotes an opening / closing frequency memory for converting the count value of the counting unit 8 and storing it as a door opening / closing index, which has a normal index storage unit 13 and a true index storage unit 14.
These will be described later.

Reference numeral 15 is a defrosting operation start judging unit for judging the start of the defrosting operation of the cooler 3, specifically, a multi-layer neural network of a neuro computer, and integrated data of the compressor operating time integrating unit 7. And a door opening / closing index, and outputs a defrosting start signal.
This defrosting start signal is cooled by switching the refrigerant flow switching valve of the refrigeration cycle of the refrigerator body 1 to supply the high temperature refrigerant to the cooler 3 or causing the electric heater to generate heat based on this signal. It functions to defrost the vessel 3.
A clock 16 supplies time information to the microprocessor 6.

The microprocessor 6 and the opening / closing frequency memory 12 cooperate with each other to determine the door opening / closing index as I _{N + 1} = N + a * I _N ──────── ──── formula (where, N is the door opening and closing times of the update date, a is constant up to 0 to 1, I _N is a door opening and closing index of the previous day, I N _{+ 1} is the door opening and closing index renewal date.) Is configured to be executed and updated.

The microprocessor 6 controls the CLOC based on the door opening / closing signal obtained from the door opening / closing detector 5.
24 hours a day with a predetermined time TC while referring to the K signal
The number of times of opening and closing for each time period is counted and stored in the opening and closing frequency memory 12, and the measured door opening and closing frequency and the door opening and closing frequency memory 1
2 based on the door opening / closing index I _{N in} the corresponding time zone read out from _{No. 2} , the door opening / closing index I _{N + 1} is newly updated and stored in the door opening / closing frequency memory 12. It is configured to do so.

With respect to the neural network 15, data regarding whether or not the defrosting operation should be started is input in advance as a teacher signal for a desired combination of the data of the integrated time and the door opening / closing index, and back propagation or the like is performed. The learning method is used to determine the coupling coefficient and the threshold value of the cells forming the neural network 15, and the learning is performed so that the error between the teacher signal and the output result becomes a certain value or less. As the defrosting operation start determination unit 15, a unit that obtains a similar function by using a fuzzy reasoner instead of the neural network is also implemented.

Further, the microprocessor 6 and the opening / closing frequency memory 12 cooperate with each other to detect the difference in the number of times of opening and closing the door this time from the normal average number of times of opening and closing the door up to the previous day, and the difference is less than a predetermined value. Only in this case, the program is configured to update and store the door opening / closing index I _{N + 1} in the true index storage unit 14.

Specifically, as shown in FIG. 2, the storage unit 13 for the average number of times of opening and closing of the door, regardless of whether or not the number of times of opening and closing of the door is abrupt, for all days until the previous day The average number of times of opening and closing of the door based on the number of times of opening and closing of each door is stored. The true index storage unit 14 stores a truly average door opening / closing index I _N of the door opening / closing for the past several days excluding the data of the sudden opening / closing of the door on the day of the update.

In this stored state, when the door opening / closing number data of this time is input from the door opening / closing counting unit 8 for a predetermined time period, the sudden phenomenon determination unit 9 stores the door opening / closing number data in the normal index storage unit 13. Compared with the normal average door opening / closing frequency data up to the day before, the difference between the two is detected, and if this difference is less than or equal to a predetermined value, the true door opening index I up to the previous day
_It is determined that _N is updated, and if it is equal to or larger than the predetermined value, it is determined not to be updated.

On the other hand, in the average door opening / closing frequency updating section 11a,
Based on the normal average number of times of opening and closing the door up to the previous day and the number of times of opening and closing of the present time, the normal average number of times of opening and closing of the door is updated and stored in the storage unit 13 for the average number of times of opening and closing of the door.

Next, in the door opening / closing index updating unit 11b, based on the true door opening / closing index I _N up to the previous time and the number of times the door is opened / closed this time, the mathematical expression is calculated to update the updated true / closed value. The door opening / closing index I _{N + 1} is calculated.

Then, in the new index selection unit 10, if the number of times of opening and closing of the current door is not abrupt according to the judgment signal of the sudden phenomenon, the updated true door opening and closing index I _{N + 1} is reversed. If it is sudden, the true door opening / closing index I _N up to the previous day is stored in the true index storage unit 14 as it is.

In the defrosting control device, the operating time of the compressor 4 is integrated from the end time of the previous defrosting, and a predetermined time (for example, a general integrated time until the start of defrosting is 8).
Open / close frequency memory 1 when 6 hours shorter than time)
2 starts to check the door opening / closing index I _N , the defrosting operation start determination unit 15 outputs a defrosting start signal in a time period when the door opening / closing frequency is low, and based on this, the microprocessor 6 outputs a control signal. Therefore, defrosting is performed during a time period when the door is opened and closed less frequently, and therefore the door is frequently opened and closed when the storage chamber 2 cannot be cooled, which causes an abnormal temperature rise in the storage chamber 2. Will be prevented.

Further, since the door opening / closing index is updated by executing the calculation of the above-mentioned mathematical expression, the start timing of the defrosting operation can be made more accurate according to the recent tendency of the door opening / closing frequency, and the updating thereof can be performed. Unlike the case where the data for the past multiple days is stored and updated based on the average value, the configuration for is not required, and the storage memory amount for multiple days is unnecessary, and it is easy to use only the memory capacity for one day. Be able to configure.

Further, for each time slot, it detects the difference of the door opening and closing times of the update date for normal average door opening and closing times of the day before, only if this difference is below a predetermined value, a new door opening and closing index I _{N Since +1} is updated / stored in the true index storage unit 14, if the number of times of opening / closing of the door on this update day suddenly increases or decreases, the door opening / closing index I _{N + 1} including the sudden data. Is no longer updated or stored in the true index storage unit 14, so that the door opening / closing index I _{N + 1} can be maintained at a true average value without being adversely affected by the number of times of sudden opening / closing of the door, and this stable door is maintained. Defrosting can be performed at an appropriate time based on the opening / closing index I _{N + 1} .

[0026]

According to the present invention, the defrosting can be performed during a time period when the door is opened and closed less frequently, so that the door is frequently opened and closed while the storage chamber cannot be cooled. It is possible to prevent abnormal temperature rise in the room.

Further, since the door opening / closing index is updated by executing the calculation of the above-mentioned mathematical expression, the start timing of the defrosting operation can be made more accurate in accordance with the recent tendency of the door opening / closing frequency, and the updating thereof can be performed. Unlike the case of updating based on the average value of a plurality of past days, the storage capacity for a plurality of days is unnecessary, and the configuration for can be simply configured with a memory capacity for one day.

Also, for each time period, the difference between the average number of times of opening and closing the door until the previous day is detected, and only when this difference is less than or equal to a predetermined value, a new door opening / closing index I _{N + 1.} Is stored and stored in the true index storage unit, so that when the number of times of opening and closing the door on the update date suddenly increases or decreases, the door opening and closing index I _{N + 1} including the sudden data is the true index. It is no longer updated or stored in the storage unit, so the door opening / closing index can be maintained at the true average value without being adversely affected by the number of times the door is opened / closed abruptly. You will be able to defrost.

Therefore, it is possible to provide a defrosting control device for a refrigerator which can surely prevent the temperature rise in the storage chamber during defrosting with a simple structure.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment of the present invention.

FIG. 2 is a flowchart of a main part of the embodiment.

[Explanation of symbols]

1 Refrigerator body 3 Cooler 4 Compressor 9 Sudden phenomenon determination unit 12 Opening / closing frequency memory 14 True index storage unit 15 Defrosting operation start determination unit _IN Door opening / closing index

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kiyoji Fukushima 2-18 Keihan Hondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Masashi Toyoshima 2-18 Keihan-hondori, Moriguchi-shi, Osaka Sanyo Denki Within the corporation

Claims (1)

[Claims] 1. A refrigerator in which a compressor supplies refrigerant to a refrigerant by intermittent defrosting, wherein one day is divided into a plurality of time zones, and the refrigerator doors for each time zone are divided. The number of times of opening and closing is detected and stored in the opening and closing frequency memory as a door opening and closing index, and the door opening and closing frequency is small by inputting the door opening and closing index and the accumulated data of the operating time of the compressor into the defrosting operation start determination unit. Defrosting is started in the time zone, and the door opening / closing index is I _{N + 1} = N + a * I _N (however,
N is the door opening / closing index on the update date, a is a constant from 0 to 1, and I _N
Is the door opening / closing index on the previous day, and I _{N + 1} is the door opening / closing index on the renewal day. ) Is performed to detect the difference between the average number of times of opening and closing the door on the previous day and the number of times of opening and closing of the update date for each time period, and only when the difference is less than a predetermined value, the door is opened. A defrosting control device for a refrigerator, characterized in that the opening / closing index I _{N + 1} is updated and stored in a true index storage unit.