JPH063344B2 - Refrigerator operation control system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Field of Industrial Application) The present invention relates to a refrigerator operation control system for controlling so as to prevent an excessive rise in internal temperature.

(Prior Art) Conventionally, in a refrigerator, a compressor of a refrigeration cycle is turned on / off in accordance with a temperature inside the refrigerator, and thus a refrigerator in the refrigeration cycle is used to cool the inside of the refrigerator to a predetermined temperature.
During this cooling operation, the compressor on time is integrated and when the integrated value reaches the preset defrosting reference cycle, the compressor is turned off and the heater for heating the cooler is energized. Defrost operation is performed.

(Problems to be Solved by the Invention) In a refrigerator, an excessively high temperature inside the refrigerator may adversely affect stored food. The cause of the high temperature rise in the refrigerator is that the refrigerator door is frequently opened and closed. In particular, in the conventional one, since the defrosting operation is uniquely executed when the integrated value of the compressor on time reaches the defrosting reference cycle, the refrigerator door is frequently opened and closed to keep the temperature inside the refrigerator. Even when the temperature is rising, the defrosting operation may be executed, and as a result, the internal cold storage temperature further increases. Such a problem may be that the time when the refrigerator door is frequently opened and closed in a day is specified to some extent by the user's habitual usage, so that the time and the defrosting execution time are different. Raise when they match.

The present invention has been made in view of the above circumstances, and an object thereof is to perform a pre-cooling operation in which a compressor is forcibly turned on when a temperature rise in the refrigerator is observed, so that the inside of the refrigerator can be sufficiently operated. You can keep it cool, so
It is possible to suppress the rise in the temperature inside the refrigerator, and when performing the defrosting operation, the defrosting operation can be performed at a time when the temperature inside the refrigerator does not rise, so that adverse effects on food can be suppressed as much as possible. It is possible to provide a refrigerator operation control system.

[Structure of the Invention] (Means for Solving Problems) The present invention relates to a compressor drive control means for turning on / off a compressor based on a temperature in a refrigerator, a compressor on-time integrating means for integrating a compressor on-time, The door opening / closing frequency counting unit that counts the number of times the refrigerator door is opened / closed within a set unit time is compared with the door opening / closing frequency count value and a preset frequency determination reference value to determine whether the door opening / closing frequency is high or low. A door opening / closing frequency determining means, a storage means for sequentially moving and storing the determination result of the door opening / closing frequency determining means to a tabled memory every time the unit time has elapsed, and 22 hours before the present time. When the door open / close frequency determination result is high or the currently stored door open / close frequency determination result is high, the compressor is turned on regardless of the temperature inside the warehouse and the operation end command is issued. Therefore the precooling operation control means for turning off the compressor, 24 hours before the current time, and 23
When the door open / close frequency judgment result stored before time is low and the pre-cooling operation is not executed, and the integrated value of the compressor on time at the present time is within the set range with respect to the preset defrost reference cycle. Defrosting operation control for turning off the compressor and turning on the defrosting heater and turning off the defrosting heater by the defrosting end detection input when the current door opening / closing count value is equal to or less than the frequency determination reference value And means.

(Operation) While the compressor is turned on / off according to the internal temperature, the compressor on time is integrated by the compressor on time integration means. Further, the number of times the refrigerator door is opened / closed within the set unit time is counted by the door opening / closing frequency counting means, and the count value is compared with the frequency determination reference value to determine whether the door opening / closing frequency is high in the unit time.
Low is determined. Then, each time the unit time elapses, the door opening / closing frequency determination result is sequentially moved and stored in the table-formed memory. Therefore, when the usage time of the refrigerator has passed one day, the memory stores the door opening / closing frequency determination result for each unit time elapsed in the day.

Thus, the pre-cooling operation control means has a high door open / close frequency determination result stored 22 hours before the present time (2 hours after the same time on the previous day) or a door open / close frequency determination result stored at the present time. When the temperature is high, the compressor is turned on regardless of the internal temperature, and the compressor is turned off by the operation end command. That is, if the door open / close frequency determination result stored 22 hours ago is high, it is determined that the door open / close frequency will be high 2 hours after the present time, and the pre-cooling operation is executed. It is possible to sufficiently cool the inside of the refrigerator in view of the rise in the temperature inside the refrigerator. If the door open / close frequency determination result is high at the present time, it is determined that the internal cold storage temperature is high at this time, and the precooling operation is executed to lower the internal cold storage temperature. Further, the defrosting operation control means is when the door opening / closing frequency determination result stored 24 hours and 23 hours before (at the same time of the previous day and 1 hour after that) is low and the precooling operation is not executed. Moreover, when the integrated value of the compressor on time at the present time is within the set range with respect to the defrosting reference cycle and the current door open / close count value is less than or equal to the frequency determination reference value, the compressor is turned on and defrosting is performed. The heater is turned on to start the defrosting operation, and the defrosting heater is turned off by the defrosting end detection input to end the defrosting operation. That is, when the door opening / closing frequency determination result stored 24 hours ago and 23 hours ago is low, it is determined that the door opening / closing frequency 1 hour after the present time will be small, and the pre-cooling operation is executed. If not, it is determined that the defrosting operation may be performed. Further, when the integrated value of the compressor on time is within the set range with respect to the defrosting reference cycle, it is determined that this is the time when the amount of frost on the cooler has increased, and the current number of times the door has been opened and closed is the frequency determination criterion. When it is less than the value, it is determined that the current inside temperature is low. When these determination results are obtained, it is determined that it is time to execute the defrosting operation, and even if the defrosting operation is executed, there is no opening / closing of the door during the execution, and it is determined that the internal temperature does not rise excessively at the end. Start defrosting operation.

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

First, in FIG. 1, reference numeral 1 is a control circuit composed of a microcomputer, which comprises a compressor drive control means, a compressor on-time integration means, a door opening / closing frequency counting means, a door opening / closing frequency determination means, a storage means, a precooling operation control means. , Also serves as a defrosting operation control means. Reference numeral 2 denotes a freezer compartment temperature determination circuit, which is configured to have a temperature sensor 3 for detecting the inside compartment temperature, for example, the freezer compartment temperature, and a comparator 4, etc.
When the temperature exceeds 5 ° C., the high-level upper limit temperature detection signal Sfo is output. This output is the input terminal A of the control circuit 1.
Given to ₁ . Reference numeral 5 denotes a defrosting end temperature determination circuit, which has a temperature sensor 6 for detecting the temperature of the cooler, a comparator 7, and the like. The defrosting end temperature determination circuit 5 outputs a high-level defrosting end detection signal Sjs and gives it to the input terminal A ₃ of the control circuit 1 when the cooler temperature becomes, for example, + 10 ° C. or higher. Reference numeral 8 denotes, for example, a door opening / closing detection circuit for detecting opening / closing of the refrigerating room door, which is configured to have a switch 8 or the like which is turned on by opening the door,
When the door is opened, a high level door open detection signal Sto
Is supplied to the input terminal A ₂ of the control circuit 1. 10 is a compressor drive circuit, which is a relay coil 11 and
A relay switch (not shown) that is turned on by the relay coil 11 to energize the compressor (not shown)
And a transistor 12 for disconnecting the relay coil 11 and the like. The transistor 12 is turned on by the high-level compressor-on signal Sco from the output terminal C ₂ of the control circuit 1. Reference numeral 13 denotes a defrost heater driving circuit, which cuts off the relay coil 14, a relay switch (not shown) which is turned on by the relay coil 14 to energize the defrost heater (not shown), and the relay coil 14. It is configured by including a transistor 15 for charging. The defrost heater is provided to heat a cooler (not shown), and the transistor 12 is turned on by a high level defrost heater on signal Sho from the output terminal C ₃ of the control circuit 1. Reference numeral 16 is a display for warning of opening the door, which is composed of a light emitting diode. This is a low level display ON signal Spd from the output terminal C ₁ of the control circuit 1.
Is lit by. Reference numeral 17 is a reset circuit.

Now, the control circuit 1 has an operation control program, and its flowchart is shown in FIG. Parameter C in this program is the count value for the number of times the door is opened, T is the time count value (seconds), Odt is the count value for the door opening time (seconds), and Ton is the compressor on time count per unit time (1 hour). Value (seconds), Std is a count value (hours) that is an integrated value of the compressor on time, Pt is a count value (seconds) regarding the precooling operation execution time, Dc is a determination value regarding whether defrosting is executed, and Tdp is the compressor on time. It is a defrosting reference cycle (hour) for the integrated value. Further, the flag D is a determination flag regarding whether or not the defrosting operation is being executed, and the flag P is a determination flag regarding whether or not the pre-cooling operation is being executed. Further, in the control circuit 1, memory areas Mr1 to Mr24 which are tabulated in 24 steps are secured in the memory.

The control function of the control circuit 1 will be described below with reference to FIG. First, in step S ₁ (subroutine), the above-mentioned parameters and flags D and P, and the respective content values of the memory areas Mr1 to Mr24 are cleared. Step S ₂ in the door opening detection signal input is present is determined whether the Sto is made, the process proceeds to it if step S ₃ in the absence (door closed state), and waits for one second. This is done by the soft timer of the subroutine. Incidentally, the gist of the "one-second waiting" is for performing a time counting at the next step S ₄ in seconds, since the execution time of the other step very short, time counting in step S ₄ is approximately 1 It is in seconds. The next step S ₅ the precooling operation execution condition for determining whether or not the flag P is judged whether "1" is made, when it is "0", the process proceeds to step S _6.
Flag D In step S ₆ is a determination whether or not "1", if not the defrosting operation execution state, step S ₇
Then, it is judged whether or not the upper limit temperature detection signal Sfo is input from the freezer compartment temperature determination circuit 2, and if it is not input, that is, if the freezer compartment temperature does not exceed -15 ° C, step S ₈ , the output of the compressor on signal Sco is stopped and the compressor is turned off. Time count value T shifts the later step S ₉ is a whether or not elapsed 3600 seconds ie 1 hour decision, when not reached returns to step S _2. Step S
In _5, but when the flag P is "1" (when it is in pre-cooling operation performed), the process proceeds husband precooling operation execution time count value Pt and a compressor on-time count value Ton and people counting step S ₁₀ up, then the count value Pt in step _{S 11} to determine whether or not passed 5400 seconds or 90 minutes. If elapsed 90 minutes, as the operation end command for precooling operation with this, turns off the compressor stops the output of the compressor ON signal Sco the process proceeds to step S _12, the flag P and the count value Pt respectively cleared to terminate the pre-cooling operation, the process proceeds to step S _9. Further, step S ₁₂ when not reached 90 minutes proceeds to step S ₉ without executing. Step S If the flag D in step S ₆ is "1" (defrosting operation execution state)
₁₃ shifts the defrosting end detection signal Sjs whether input has been entered judgment from defrosting ending temperature determination circuit 5 in. If there is input or defrosting completion detecting input, defrost heater ON signal in step S ₁₄ It stops the output of the sho, and the flag D to "0", to exit the defrosting operation, and step S ₉
Proceeds to step S ₁₄ if there is no input, the process proceeds to step S ₉ without executing. Further, in step S _7, if there is the input of the upper limit temperature detection signal Sfo, to turn on the compressor and outputs the compressor on signal Sco the process proceeds to step S _15, the compressor on-time count value Ton in step S ₁₆ Is counted up, and the process proceeds to step S ₉ .

Here, in step S ₂ , the door opening detection signal Sto
If the input is there a determination of the procedure proceeds to step S _17, counts up the door opening number count value C. Then, the processing proceeds to the subsequent step _{S 18.} This step S
Execution content from ₁₈ to step _{S 23} is executed contents and respective same steps _{S 3} described above to step _{S 8,} also the execution contents from step _{S 24} to step _{S 30} from step _{S 10} described above it is identical to the execution contents of steps S _16. In step S ₃₁ to step S _35, and so as to drive and control the display unit 16 in accordance with the door opening and closing state, if the door is opened (decision at step S _31), the count of the door opening time Value O
When dt is counted up (step S ₃₂ ), and the count value Odt reaches 300 seconds, that is, 5 minutes (determined in step S ₃₃ ), the display 16 is turned on (step S _34).
Indicator on signal Sdp output) and in, and, if the closed door (determined in step _{S 31),} the indicator 16 is unlit (Step _{S 35).}

Now, when the time count value T has passed 3600 seconds (1 hour), and determines whether or not the flag D is "1", the process proceeds from step S ₉ to step S _36, if it is "0" the process proceeds to step S ₃₇ determination value Dc for defrosting operation execution presence is determined whether or not "0", "0"
If any, that the power still defrosting operation after turning is not made (the previous defrosting operation to be executed is the first time after power-on) times, defrosting reference period for the compressor on-time integrated value in step S ₃₈ Tdp for "4 hours"
Set to. This defrosting reference cycle Tdp is normally set to about "8 hours", but since the integrated value of the compressor on time is cleared when a power failure occurs, it is approximately intermediate after the power is turned on (after the power failure is restored). "4 hours", which is a typical value, is set as an initial value. Further, in step _{S 37,} D
When c is "1" (this Dc is in step S
It is set to "1" at the same time when the defrosting operation is started in ₄₄ )
In other words, if the defrosting operation has been performed even once, as shown in step S ₃₉ , the defrosting reference period Tdp
Is set to "8 hours".

And Thus, the step when S ₃₈ or Step S _{39 2} defrosting reference period Tdp is set to one, the process proceeds to step S _40, which until the compressor on-time count value Ton of the compressor ON time i.e. per hour unit of Is converted to “hour” units and the compressor on-time integrated value St
Count up d. Thereafter, the process proceeds to step _{S 42} to clear the Ton in step _{S 41.}

In this step S ₄₂ , the memory areas Mr1 and Mr1 are
Both the content values of 2 are "0" (the setting of this content value will be described later), and the flag P is "0", that is, when the pre-cooling operation is not executed, and the number of times of opening the door at the present time. count value C is not more than 2 times, yet steps S ₄₃ and step S ₄₄ when the compressor on-time integrated value Std is in the range of defrosting reference period Tdp ± 2
The running in order to migrate to step S _47. The output of the step S ₄₃ in the compressor ON signal Sco stopped (compressor OFF), in step S _44, and outputs a defrosting heater ON signal Sho starts defrosting operation, further, the determination value Dc and the flag D " 1 ”, stacking value St
Clear d. Further, in step S _42, the process proceeds to step S ₄₅ if at least one condition is satisfied, the integrated value of the compressor on-time Std
Determines whether the defrosting reference period Tdp has exceeded 2 hours, and if it exceeds, it proceeds to step S ₄₆ to clear the flag P and the count value Pt, respectively, and the above-described step S ₄₃ and the operation proceeds to S _44, also as in the case where the integrated value of the compressor on-time Std does not exceed 2 hours defrosting reference period Tdp proceeds to (defrosting operation is not to not start) step S _47.

In step _{S 47} each of the memory areas Mr1, Mr
2, ... The content values of Mr23 and Mr24 are sequentially moved to the upper memory area and stored. Since this step S ₄₇ is made under the condition that after one hour in step S _9, the mobile storage every hour is performed. Familiar following for determining whether or not the step S ₄₈ in the count value C of the door opening times in the past hour is equal to or less than the frequency criterion value example 2 times, the lowest memory area in step S ₄₉ if the following "0" the contents value of MR 24 (door opening frequency low) and "1" the content value of the lowest memory area MR 24 in step S ₅₀ be no more than (door opening and closing frequency high) to. After a step S ₅₀ or step S _49, the process proceeds to door opening number count value C and the time count value T to respectively cleared in step S _51, the process proceeds to step S _52. This step in S ₅₂ the flag D is a determination whether or not "1", when it is "1" returns to the step S _2, if it is "0" step S
Content value of the memory area Mr2 goes to ₅₃ is "1" or the content value of Mr24 is made a determination whether the "1", both the flow returns to step S ₂ to be satisfied, either is satisfied step S ₅₄ proceeds to determine whether or not the flag P is "1" is made if Re, the process returns to step S ₂ is "1", step S ₅₅ if it is "0"
Move to. Outputs the step _{S 55} compressor ON signal Sco in the flag P is "1",
The count value Pt is cleared. After this, the process returns to step S ₂ .

Now, as it can be seen from step S _48, compared door opening number count value C at the present time is the frequency determination reference value in this case twice, the door opening and closing frequency when the count value C is twice the low and determination and, stored in the memory area Mr24 the determination result as the content value "0" (step _S 49),
When the count value C exceeds 2 times determines the door opening-closing frequency and high, it is stored in the memory area Mr24 the determination result as the content value "1" (step S _49).

Further, the content value stored in the memory area Mr24 at this point is moved to the high memory area Mr23 in step S ₄₇ that runs 1 hour after after this. Therefore, when the above power-on after 24 hours has elapsed, the content value of the memory area Mr24 in step S ₅₃ is the door opening-closing frequency determination result at the present time, also, the content value of the memory area Mr2 is 22 hours prior (day at the same time 2 hours later) is the door opening / closing frequency determination result stored.

And Thus, the determination at step S ₅₃ is presently stored in the door opening and closing frequency determination result of determination high as or 22 hours stored the door opening-closing frequency determination result before is high, that is, When it is determined that the internal cold storage temperature is high at the present time, or when it is determined that the internal cold storage temperature will be increased two hours after the current time, the pre-cooling operation is not performed at this time (step _S54) . when the flag is determined that P ≠ 1) is to turn on the compressor at step S _55, the flag P is "1" and then and initial value precooling operation execution time count value Pt "0", the pre-Te following Start the cooling operation. If this pre-cooling operation is started, the flag P
Is “1” and step S ₇ (or step S ₂₂ ) is not executed, the temperature inside the refrigerator (freezer compartment temperature)
The compressor is turned on regardless of. In this pre-cooling operation, the set temperature of the refrigerating room is set slightly lower than the set temperature during normal compressor on / off control.Therefore, in addition to the freezing room, the refrigerating room is cooled to a lower temperature than usual. Will be done. Thus, since the pre-cooling operation is executed when it is expected that the frequency of opening and closing the door will increase two hours ahead, the temperature inside the refrigerator will be excessive even if the door is frequently opened and closed. Never rise to.

Further, defrosting operation is configured to be executed based on the determination result of step _{S 42} (step _{S 43,} step _{S 44).} That is, at the time when step _S42 is executed, the content value "0" or "1" 24 hours ago is stored in the highest memory area Mr1. Stored content values 24 hours ago and 23 hours ago (memory areas Mr1 and Mr
If the (content value of 2) is “0”, it is determined that the temperature in the refrigerator will not rise for one hour after the local point because the number of times the door is opened is small. Similarly, if the current door open count value C is equal to or less than the frequency determination reference value (twice), it is determined that the inside temperature at this time is kept low. Furthermore, the purpose of determining whether the integrated value Std regarding the compressor on time is within the setting range (Tdp-2 ≦ Std ≦ Tdp + 2) with respect to the reference time Tdp is the defrosting operation in this time period. It does not matter if you start. Further, the purpose of determining whether the flag P is “0” is that the defrosting operation is not executed if the precooling operation is being executed (P = 1). However, the integrated value Std is 2 from the defrosting reference cycle Tdp.
To abort the pre-cooling operation if it exceeds the time to perform the defrosting operation (step _{S 45,} step _{S 46,} step _{S 43,} step _S 44). And Thus, if it is above the determined conditions are all satisfied in step S _42, a time to no problem in defrosting, the inside temperature can be at that end smaller opening and closing of the door during the run Run and the it is determined that it is not unduly increased, defrosting operation is started in step S ₄₃ and step S ₄₄ as described above. Therefore, when the defrosting operation is executed, it is possible to minimize the temperature rise in the refrigerator due to the opening and closing of the door, and the adverse effect on the food can be reduced.

[Effects of the Invention] As is apparent from the above description, the present invention is based on the door opening / closing frequency determination result sequentially stored for each unit time and the number of times of opening / closing of the door at the present time, and It is possible to determine the time when it will not come, and the pre-cooling operation and the defrosting operation are executed based on the timing judgment result. It is possible to cool, and when performing the defrosting operation, the defrosting operation can be executed at a time when the internal cold storage temperature does not rise, and overall, the internal cold storage temperature rise can be minimized. It has an excellent effect that adverse effects on food can be reduced.

[Brief description of drawings]

FIG. 1 shows an embodiment of the present invention, FIG. 1 is an electric circuit diagram,
FIG. 2 is a flowchart of the control program. In the figure, 1 is a control circuit (compressor drive control means, compressor on-time integration means, door opening / closing frequency counting means,
Door opening / closing frequency determination means, storage means, precooling operation control means,
Defrosting operation control means) 2 is a freezer compartment temperature determination circuit, 5 is a defrosting end temperature determination circuit, 8 is a door opening detection circuit, 10 is a compressor drive circuit, and 13 is a defrost heater drive circuit.

Claims (1)

[Claims] 1. A compressor is turned on based on the internal temperature.
A compressor drive control means for turning off, a compressor on-time integrating means for integrating the compressor on-time, a door opening / closing frequency counting means for counting the number of times the refrigerator door is opened / closed within a set unit time, and a door opening / closing frequency count value. A door opening / closing frequency judging means for judging whether the door opening / closing frequency is high or low by comparing with a preset frequency judging reference value, and a judgment result of the door opening / closing frequency judging means are tabulated every time the unit time elapses. Storage means for sequentially moving to the memory and storing it, and storing the compressor when the door open / close frequency determination result stored 22 hours before the current time is high or the door open / close frequency determination result stored at the present time is high. Pre-cooling operation control means for turning on the compressor regardless of the internal temperature and turning off the compressor according to the operation end command, and 24 hours before the present time and 2
When the door open / close frequency determination result stored 3 hours ago is low and the pre-cooling operation is not executed, and the integrated value of the compressor on time at the present time is within the preset range of the defrosting reference cycle. Defrosting operation in which the compressor is turned off, the defrost heater is turned on, and the defrost heater is turned off by the defrost end detection input when the count value of the number of times of opening and closing the door is equal to or less than the frequency determination reference value A refrigerator operation control system comprising a control means.