JP2869224B2 - Refrigerator defrost 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 defrosting control device for a refrigerator which performs defrosting in a time period when a door is frequently opened and closed.

[0002]

2. Description of the Related Art Prior to the present invention, Japanese Utility Model Publication No. 55-7795
In the conventional refrigerator defrosting device described in Japanese Patent Application Laid-Open Publication No. H10-163, the operation 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 this type of refrigerator defroster, if the defrosting is arbitrarily started by a timer and the defrosting is started during a time period when the frequency of opening and closing the storage room door is high, the storage room is not operated. There is a drawback that outside air frequently enters in a state in which cooling is impossible, resulting in an increase in room temperature.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks and to provide a defrosting control device for a refrigerator which can reliably prevent a rise in the temperature of a storage room during defrosting with a simple structure. is there.

[0005]

SUMMARY OF THE INVENTION The present invention relates to a defrosting control device for a refrigerator having a defrosting device, which counts the number of times the refrigerator door is opened and closed for each of a plurality of time periods constituting one day. Means, an opening / closing frequency memory for storing the number of times the door is opened / closed for each time zone, and a door opening / closing index setting for setting a door opening / closing index for each time zone according to the number of times the door is opened / closed for each time zone. Means, a sudden phenomenon determining means for determining whether or not a sudden phenomenon has occurred based on the number of times the door is opened and closed for each time period, and a case where the sudden phenomenon determining means determines that the sudden phenomenon has not occurred. Only, an updating means for updating the door opening / closing index, and a defrost signal generating means for generating a defrost start signal for controlling the defrosting device based on the door opening / closing index updated by the updating means. It is equipped.

[0006]

According to the present invention, defrosting can be performed in a time period when the door is not frequently opened and closed, so that the door is frequently opened and closed in a state where the storage room cannot be cooled. An abnormal temperature rise can be prevented.

Further, the door opening / closing index is updated only when it is determined that the number of times the door is opened / closed in each time zone is not due to a sudden phenomenon. Therefore, a reliable door opening / closing index is obtained without being adversely affected by the sudden number of door opening / closing times, and defrosting can be performed in a more accurate time zone.

[0008]

[0009]

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

In FIG. 1, reference numeral 1 denotes a refrigerator body having a storage room 2, which is cooled by a cooler 3. 4
Is a compressor which constitutes a part of a refrigeration cycle, and supplies a refrigerant from the compressor 4 to the cooler 3. Reference numeral 5 denotes a door opening / closing detector for detecting the opening / closing of the door of the storage room 2.

Reference numeral 6 denotes a microprocessor as a central processing unit, which is a compressor operating time integrating section 7 for integrating the operating time of the compressor 4 and a counting means for counting the number of times of opening and closing detected by the door opening and closing detector 5. And a counting unit 8. Further, as described later, the microprocessor 6 includes a sudden phenomenon determination unit 9 as a sudden phenomenon determination unit that determines whether a sudden phenomenon has occurred, an average door opening / closing frequency updating unit 11a, and a door for setting a door opening / closing index. An opening / closing index updating section 11b as opening / closing index setting means and a new index as updating means for updating the door opening / closing index for determining the start of the defrosting operation only when it is determined that the sudden phenomenon has not occurred. And a selection unit 10.

An opening / closing frequency memory 12 converts the count value of the counting section 8 and stores it as a door opening / closing index. The opening / closing frequency memory 12 has a normal index storing section 13 and a true index storing section 14.
These will be described later.

Reference numeral 15 denotes a defrosting operation start judging section as a defrosting signal generating means for judging the start of the defrosting operation of the cooler 3 and generating a defrosting start signal for defrosting control. Is constituted by a multilayer neural network of a neurocomputer, and operates based on the integrated data of the compressor operating time integrating section 7 and the door opening / closing index to output a defrosting start signal. The defrosting start signal is generated by switching the refrigerant flow switching valve of the refrigeration cycle of the refrigerator main body 1 to supply a high-temperature refrigerant to the cooler 3 or causing the electric heater to generate heat based on this signal. The defroster functions to defrost the cooler 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 obtain 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 updated by executing the above calculation.

The microprocessor 6 generates a CLOC based on a door open / close signal obtained from the door open / close detector 5.
24 hours a day for a predetermined time TC while referring to the K signal
(Specifically, one hour), the number of times of opening / closing for each time zone is counted and stored in the opening / closing frequency memory 12, and the measured number of times of opening / closing of the door and the door opening / closing frequency memory 1
Based on the door opening and closing index I _N of the corresponding time slot to come read from 2, updates and stores the door opening and closing frequency memory 12 a new door opening and closing index I _{N + 1} by performing the operation of the equation It is configured to do so.

In the neural network 15, for a combination of data of a desired integration time and a door opening / closing index, data as to whether or not to start a defrosting operation is input as a teacher signal in advance, and back propagation or the like is performed. In the learning method, the coupling coefficient and the threshold value of the cells constituting the neural network 15 are determined in advance, and learning is performed so that the error between the teacher signal and the output result is equal to or less than a certain value. As the defrosting operation start determining unit 15, a unit that obtains a similar function using a fuzzy inference unit 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 a difference of the current door opening / closing frequency from the normal average door opening / closing frequency up to the previous day, and this difference is equal to or less than a predetermined value. Only in case ( ₁₎ , a program is configured to update and store the door opening / closing index I _{N + 1} in the storage section 14 of the true index.

Specifically, as shown in FIG. 2, the storage unit 13 for the average number of times of opening and closing of the door is stored in each time zone for all days up to the previous day regardless of whether the number of times of opening and closing of the door is sudden. The average door opening / closing data based on each door opening / closing frequency is stored. The storage unit 14 of the real index, the update date recent days excluding the data of the sudden situation on the day of the door opening and closing, and stores an average door opening and closing index I _N a true door opening and closing.

In this stored state, when the current door opening / closing number data is inputted from the door opening / closing counting section 8 for a predetermined time zone, the sudden phenomenon determining section 9 stores the door opening / closing number data in the normal index storage section 13. Is compared with the normal average number of times of door opening and closing up to the previous day, and the difference between the two is detected.
_It is determined that _{N is} to be updated, and if it is equal to or greater than the predetermined value, it is determined not to update.

On the other hand, in the average door opening / closing frequency updating unit 11a,
Based on the normal average door opening / closing frequency up to the previous day and the current door opening / closing frequency, the normal average door opening / closing frequency is updated and stored in the average door opening / closing frequency storage unit 13.

Next, at the door opening and closing index update section 11b, based on the true door opening and closing index I _N and the current door opening and closing times up to the previous time, by executing the calculation of the equation, the updated true Of the door opening / closing index I _{N + 1} is obtained.

If the current door opening / closing frequency is not abrupt in accordance with the determination signal indicating whether or not a sudden phenomenon has occurred, the new index selecting section 10 sets the updated true door opening / closing index I _{N + 1} on the contrary. a true door opening and closing index I _N of the previous day if sudden and directly stored in the storage unit 14 of the real index.

In the defrost control device, the operation time of the compressor 4 is integrated from the end of the previous defrost, and is calculated for a predetermined time (for example, 8 which is a general integrated time until the start of defrost).
Opening / closing frequency memory 1
Begin examining the second door opening and closing index I _N, so as to output the defrosting start signal from the defrosting operation start determination unit 15 to the small hours of the door opening and closing frequency, and outputs a control signal from the microprocessor 6 on the basis of this Therefore, defrosting is performed during a time period when the frequency of opening and closing of the door is small, so that the door is frequently opened and closed in a state where the storage room 2 cannot be cooled, and an abnormal rise in temperature of the storage room 2 due to the defrosting. Will be prevented.

Further, since the door opening / closing index is updated by executing the operation of the above formula, the start timing of the defrosting operation can be made more accurate in accordance with the recent door opening / closing tendency, and the updating thereof can be performed. Is different from, for example, storing and holding data for the past multiple days and updating it based on the average value, the storage memory amount for multiple days is unnecessary, and the memory capacity for one day is simply used. Configurable.

Further, a difference between the average number of door opening / closing operations on the updated day and the average number of door opening / closing operations up to the previous day is detected for each time period, and only when the difference is equal to or less than a predetermined value, a new door opening / closing index I _{N Since +1} is updated and stored in the true index storage unit 14, when the number of times of door opening / closing suddenly increases / decreases on the current update date, the door opening / closing index I _{N + 1} including unexpected data. Is no longer updated and 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 sudden door opening / closing times. Defrosting can be performed in an accurate time zone based on the opening / closing index IN _{+ 1} .

[0026]

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

Further, the door opening / closing index is updated only when it is determined that the number of times of opening and closing of the door for each time period is not due to the sudden phenomenon. The switching index can be obtained, and defrosting can be performed in a more accurate time zone.

[0028]

Therefore, it is possible to provide a defrosting control device for a refrigerator capable of reliably preventing a rise in the temperature of the storage chamber during defrosting with a simple configuration.

[Brief description of the 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]

DESCRIPTION OF SYMBOLS 1 Refrigerator main body 3 Cooler 4 Compressor 9 Sudden phenomenon judgment part 12 Opening / closing frequency memory 14 True exponent storage part 15 Defrosting operation start judgment part _IN door opening / closing index

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Seiji Fukushima 2--18 Keihanhondori, Moriguchi-shi, Osaka Sanyo Electric Co., Ltd. (72) Inventor Masashi Toyoshima 2--18 Keihanhondori, Moriguchi-shi, Osaka (56) References JP-A-54-28055 (JP, A) JP-A-63-254379 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) F25D 21 / 06-21/12

Claims (1)

(57) [Claims] 1. A defrosting control device for a refrigerator having a defrosting device, comprising: counting means for counting the number of times the refrigerator door is opened and closed for each of a plurality of time zones constituting one day; An opening / closing frequency memory for storing the number of times the door is opened / closed; a door opening / closing index setting means for setting a door opening / closing index for each time zone according to the number of times the door is opened / closed for each time zone; A sudden phenomenon determining means for determining whether or not a sudden phenomenon has occurred based on the number of times the door has been opened and closed; and only when the sudden phenomenon determining means determines that the sudden phenomenon has not occurred, the door opening / closing index is calculated. Updating means for updating, and defrosting signal generating means for generating a defrosting start signal for controlling the defrosting device based on the door opening / closing index updated by the updating means. Refrigerator defrost control device.