JPH063343B2 - 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) By the way, in the refrigerator, if the temperature inside the refrigerator is excessively high, there is a problem that the stored food is adversely affected.
In particular, in the conventional one, the defrosting operation is uniquely executed when the integrated value of the compressor on time reaches the defrosting reference cycle, so that the refrigerator door is frequently opened and closed. Even when the internal temperature is rising, the defrosting operation may be performed, and as a result, the internal cold storage temperature may be excessively increased, often causing a problem that adversely affects food storage. In particular, such a defect may be identified to some extent during the day when the refrigerator door is opened and closed frequently and the temperature inside the refrigerator rises due to the user's habitual usage. It occurs when the band and the defrosting execution timing 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. It is possible to keep it cool, and to perform the defrosting operation, it is possible to perform the defrosting operation at a time when the internal cold storage temperature does not rise, so that the internal cold storage temperature does not rise excessively. Another object of the present invention is to provide a refrigerator operation control system that can suppress adverse effects on foods as much as possible.

[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, Average temperature calculating means for calculating the average cold storage temperature in the set unit time and the average cold storage temperature in one day, and a memory in which the average cold storage temperature in the unit time is tabulated every time the unit time passes. The storage means for sequentially moving and storing the data in the unit, and the average storage temperature in the unit time stored 22 hours before the current time is higher than the average storage temperature in the day or the average storage temperature in the unit time stored at the present time is Precooling operation control means for turning on the compressor regardless of the inside temperature and turning off the compressor according to the operation end command when the temperature is higher than the average daily inside temperature. The average cold storage temperature in the unit time stored immediately before and 23 hours ago is smaller than the cold storage average temperature of the day, and the average cold storage temperature of the unit time at present is lower than the average cold storage temperature of the day. If the integrated value of the compressor on-time is small and is within the set range with respect to the preset defrost reference cycle and the pre-cooling operation is not executed, the compressor is turned off and the defrost heater is turned on. The defrosting operation control means for turning off the defrosting heater in response to the defrosting completion detection input is provided.

(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. In addition, the average temperature calculating means calculates the average internal temperature in the set unit time and 1
The daily average temperature in the refrigerator is calculated. Then, every time the unit time elapses, the average in-compartment temperature of the unit time is sequentially moved and stored in the table-formed memory. Therefore, when the refrigerator is used for more than one day, the
The average in-compartment temperature for each unit time elapsed on a day is stored.

Thus, the pre-cooling operation control means sets the average cold storage temperature of the unit time stored 22 hours before the current time (2 hours after the same time of the previous day) and the average cold storage temperature of the unit time stored at the current time. When either of them is higher than the average temperature in the day,
Turns on the compressor regardless of the temperature inside the refrigerator. That is,
If the average cold storage temperature in the unit time stored 22 hours ago is higher than the average cold storage temperature of the day, it is determined that the cold storage temperature will rise 2 hours after the current time, and the pre-cooling operation is executed. Therefore, it is possible to sufficiently cool the inside of the refrigerator, considering that the temperature inside the refrigerator will rise. If the average cold storage temperature per unit time stored at this time is higher than the average cold storage temperature of the day, it is determined that the cold storage temperature is high at the current time, and the pre-cooling operation is executed to lower the cold storage temperature.

Further, the defrosting operation control means is configured such that the average cold storage temperature in the unit time stored 24 hours and 23 hours before the current time is smaller than the average cold storage temperature in one day, and the average in the current unit time is calculated. When the internal cold storage temperature is lower than the average daily internal cold storage temperature, the current compressor on-time integrated value is within the set range for the defrosting reference cycle, and the pre-cooling operation is not being executed, the compressor Is turned on and the defrost heater is turned on to start the defrost operation, and the defrost heater is turned off by the defrost end detection input to end the defrost operation. In other words, 24 hours ago (at the same time on the previous day) and 23
When the average cold storage temperature for a unit time that was stored before that time (1 hour after the same time on the previous day) is less than the average cold storage temperature for the day, with this, the cold storage temperature 1 hour after the local point becomes If it is determined that it is low, and the average temperature inside the unit time at present is lower than the average temperature of the day, it is determined that the temperature inside is still low, and the integrated value of the compressor on time is When it 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 if the pre-cooling operation has not been executed, the defrosting operation may be executed. To determine. When these judgment results are obtained, it is the time to execute the defrosting operation, and even if it is executed, the inside temperature does not rise due to opening and closing of the door during the execution, and the inside temperature becomes excessive at the end time. It judges that it will not rise and starts 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 comprising a microcomputer, which comprises a compressor drive control means, a compressor on-time integration means, an average temperature calculation means, a storage means, a precooling operation control means, and a defrosting operation control means. It is also used. Reference numeral 2 denotes a cooling chamber temperature determination circuit, which is configured to include a temperature sensor 3 for detecting the temperature inside the refrigerator, for example, the temperature of the cooling chamber, a comparator 4, and the like. When it becomes above, the high level upper limit temperature detection signal Sfo is output. This output is given to the input terminal A ₁ of the control circuit 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.
8 is a temperature sensor 9 for detecting the temperature inside the refrigerator, for example, the temperature of the refrigerating room
Is an internal temperature detection circuit, which supplies temperature data Tm corresponding to the temperature to the input terminal A ₂ of the control circuit 1. Reference numeral 10 denotes a compressor drive circuit, which includes a relay coil 11, a relay switch (not shown) that is turned on by the relay coil 11 to energize a compressor (not shown), and a transistor 12 that connects and disconnects the relay coil 11. And so on. The transistor 12 is turned on by the high-level compressor-on signal Sco from the output terminal C ₁ of the control circuit 1. Thirteen
Is a defrost heater drive circuit, which is a relay coil 14 and
A relay switch (not shown) that is turned on by the relay coil 14 to energize a defrost heater (not shown)
And a transistor 15 for disconnecting electricity from the relay coil 14 and the like. The defrost heater is provided to heat a cooler (not shown), and the transistor 12 is turned on by a high level compressor-on signal Sco from the output terminal C ₂ of the control circuit 1.
Reference numeral 16 is a reset circuit.

Now, the control circuit 1 has an operation control program, and its flowchart is shown in FIG. The parameter C in this program is a count value that is also used for the number of times the temperature inside the refrigerator is measured and the time (minutes), T is the integrated value of the temperature inside the refrigerator (° C), Ton is the compressor on-time count value per minute (minutes), and Std is The count value (hour) that is the integrated value of the compressor on time, Pt is the count value (minutes) for the precooling operation execution time, and Tdp is the defrosting reference cycle (hour) for the integrated value of the compressor on time. 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. In addition, this control circuit 1 has
In the memory, memory areas Mr1 to Mr24 tabulated in 24 steps are secured. In addition to this, a memory area Mr25 for storing the average temperature in the refrigerator for one day,
A memory area Mr26 for storing the average internal cold storage temperature at a local point per unit time is secured.

The control function of the control circuit 1 will be described below with reference to FIG. When the power is turned on, first, in step S ₁ (subroutine), the above-mentioned parameters and flags D and P are cleared, and at the same time, the memory areas Mr1 to M are cleared.
Each content value of r24 is set to an initial value of 3 ° C. Step S
₂ , the upper limit temperature detection signal S from the freezer compartment temperature determination circuit 2
fo input is determined whether or not there been made, if there is an input, it outputs a compressor ON signal Sco and (compressor ON) counts up the compressor on-time count value Ton in step S ₄ in step S _3, and the process proceeds to step _{S 6.} In step S ₂ , the signal Sf
If no o is input, the output of the compressor-on signal Sco is stopped in step S ₅ , and the process proceeds to step S ₆ . In step S ₆ and performs a wait of one minute,
This is done by the soft timer of the subroutine. Incidentally, the gist of the "wait 1 minute" is the step S _4, step S
_{10. This} is because the time counted in step S _{26 and the} like is performed in units of 1 minute, and the execution time of the other steps is extremely short, so the time count in step S _{4 and the} like is approximately 1
It is in minutes. The following is determined whether the compressor on-time count value T ON in step S ₇ has passed the 240 minutes or 4 hours, when not reached returns to step S _2. The 240 minutes, that is, 4 hours is an initial value of the defrosting reference cycle for the first defrosting operation after the power is turned on, and the purpose of the 4 hours is as follows. That is, normally, the defrosting reference cycle is set to "8 hours", but since the integrated value of the compressor on time is cleared when there is a power failure, it is almost intermediate after power is turned on (after power failure is restored). The initial value is "4 hours", which is a reasonable value. And Thus, when the four hours have elapsed, and the process proceeds to step S ₈ stops outputting the compressor ON signal Sco output defrosting heater ON signal Sho Step S ₉ with (compressor OFF) (defrost heater on) Start defrosting operation. This defrosting operation is the first defrosting operation after the power is turned on. And Thus, as can be seen from the steps S ₁₀ and step S _11, the defrosting completion detecting signal from the defrosting completion temperature sensing circuit 5 Sj
s input is the (determination in step _{S 10),} and stops the output of the defrosting heater ON signal Sho (step _{S 11),} and terminates the defrosting operation.

Now, when this first defrosting operation ends, the operation control system functions for the second and subsequent defrosting operations. First, in step S _12, the standby one minute is performed, and in step S _13, reads the internal temperature data Tm from the inside temperature detection circuit 8. Then, the counts up the count value C in step _{S 14,} step S
_{At 15} , it is determined whether the flag P is "1".
If the pre-cooling operation is not executed here (flag P =
If 0) integrates the internal temperature T based proceeds to the next step S ₁₆ to the in-compartment temperature data Tm. Then the flag D is "1" whether or not the input of the upper limit temperature detection signal Sfo proceeds to (defrosting operation execution state) unless the step S ₁₈ that there determination in step S _17, if the input , together with turned on (step _{S 19)} compressor, the process proceeds to step _{S 21} counts up the compressor on-time count value Ton (step _{S 20).} The step _{S 18} at the upper limit temperature detection signal Sfo inputs no if the compressor off (step _{S 22)}
The process proceeds to step _{S 21} in. Also, if in step S ₁₇ the flag D is "1" (during defrosting operation executed), the defrost termination temperature determining circuit proceeds to step S ₂₃ 5
Defrosting end detection signal input is present is determined whether the Sjs from and, if there is an input transition and outputs the compressor on signal Sco at step S _24, the flag D in the step S ₂₁ in the "0" If there is no input, step S
₂₃ proceeds to step _{S 21} without executing. Further, in the step S _15, (if in precooling operation performed) If the flag P is "0", the inside temperature integrated value T on the basis of the internal temperature data Tm proceeds to step S ₂₅ Is added. In this case, the pre-cooling operation will be described later, but since the inside of the refrigerator is cooled lower than the normal cooling operation (about 3 ° C. lower), 3 ° C. is added to the inside temperature data Tm to store the inside of the refrigerator. Handle the internal temperature integrated value T in the same way as in the normal cooling operation. After this step S ₂₅ , step S ₂₆
Proceeds to counts up the compressor on-time count value Ton with counts up the precooling operation execution time count value Pt, the flag P and the count value Pt if elapsed count value Pt is 90 minutes in the step S ₂₇ Are cleared respectively (step S ₂₈ ), and if not elapsed, step S ₂₈ is not executed and step S ₂₈ is executed.
_Move to ₂₁ . Then, step S ₂₁ in the count value C (inside temperature measurement number and time count value) "60"
That is determined whether or not more than 60 minutes, does not exceed the flow returns to step S _12.

Now, when the time count value C has passed the 60 minutes (1 hour), and determines whether or not the flag D is "1", the process proceeds from step S ₂₁ to step S _29, if it is "0" (if not running defrosting operation), and sets the defrosting reference period Tdp to "8 hours" in step S _30. That is, for the second and subsequent defrosting operations, the defrosting reference cycle Tdp is set to the normal “8 hours”.

Thereafter, the process proceeds to step S _31, the previous compressor on-time count value Ton of the compressor on-time words per time unit to convert the "hour" unit to the can count up the compressor on-time integrated value Std. Thereafter, step S clears the Ton in step _{S 32
Move} to ₃₃ .

In this step _S33 , the average internal temperature (T / 60) in the last hour is calculated, and the average internal temperature "T / 6" is calculated.
0 ”is stored in the memory area Mr26. Then, Step mean-compartment temperature in the _{S 34} 24 hours That day {(Mr1 + Mr2 + ... Mr24 ) / 24} calculated by the stores the average in-compartment temperature to the memory area MR 25. Next, at step S _35, and clears the count value C and the interior temperature integrated value T, and proceeds to step S _36.

In this step S ₃₆ , the memory areas Mr1 and Mr1 are
Both of the content values of 2 are smaller than the content value of the memory area Mr25 and the current memory area Mr26 is present.
Is smaller than the content value of Mr25, the compressor on-time integrated value Std is in the range of the defrosting reference cycle Tdp ± 2, and the flag P is “0” (pre-cooling operation is not executed). sometimes, the process proceeds to step _{S 39} to perform the steps _{S 37} and step _{S 38} in order. In the step _{S 37} compressor ON signal Sc
Output of o is stopped (compressor off), and step S
_{In 38} , the defrost heater ON signal Sho is output to start the defrost operation, and the flag D is set to "1" to set the stacking value S.
Let td be “0”. Further, in step S _36, the process proceeds to step S ₄₀ if neither be satisfied by one of the conditions, the integrated value St of the compressor on-time
It is judged whether or not d exceeds the defrosting reference period Tdp for 2 hours, and if it exceeds, the flag P and the precooling operation execution time count value Pt are respectively cleared in step S ₄₁ , and the above-mentioned step S _{38 is performed.} the operation proceeds to (without starting the defrosting operation) as in the case of not exceeding the process proceeds to step S _39. Incidentally, in the step _{S 29,} if the flag D is "1" (running defrosting operation), the step _{S 42} and step _{S 43} executed (steps _{S 33} and step _{S 35} and respectively identical to the contents of the) the process proceeds to step _{S 39} Te.

In this step S ₃₉ , each memory area Mr1, Mr1
The content values of 2, ... Mr23, Mr24 are sequentially moved to and stored in the upper memory area. Since this step S ₃₉ is made under the condition that after one hour in step S _21, the mobile storage every hour is performed. Memory area Mr in average in-compartment temperature (previous step _{S 33} or step _{S 42} in the next at the step _{S 44} where 1 hour
26 temperature) stored in the stored in the memory area MR 24, and proceeds to step _{S 45.} In step _S45 , it is determined whether the flag D is "1",
Returning to step S ₁₂ when it is "1",
"0" if the contents value of the memory area Mr2 proceeds to step S ₄₆ of whether the content values of either or memory areas Mr24 greater than the content value of the memory area Mr25 is higher than the content value of the memory area Mr25 If neither is satisfied, the process returns to step S ₁₂ , and if either is satisfied, the process proceeds to step S _47. If the flag P is “1”, the process returns to step S ₁₂ and must be “1”. the flow returns to step _{S 12} to perform the step _{S 48.} Outputs the step S ₄₈ in the compressor signal Sco, the flag P is "1", further clears the precooling operation execution time count value Pt.

When the first hour has passed, the average internal temperature (T / 60) in one hour, which is the unit time, is first calculated in step S.
₃₃ or in step S ₄₂ is stored in the memory area Mr 26 and in step S ₄₄ in the lowest memory area Mr 24 of the tabulated memory, and
After the lapse of the next 1 hour, the content value of the memory area Mr24 is moved and stored in the upper memory area Mr23. Therefore,
If 24 hours or more have passed after the power was turned on, step S ₃₆
At the time when is executed, the highest inside memory area Mr1 stores the average inside temperature 24 hours before, and the memory area Mr2 stores the average inside temperature 23 hours before 1 hour. And step S after execution of step S _39.
In the memory area Mr2 of ₄₆ , the average internal cold storage temperature for one hour 22 hours before is stored.

And Thus, in step S _46, an average-compartment temperature of the contents value, i.e. 22 hours before the contents of the average in-compartment temperature of day stored in (2 hours after the same time of the previous day) is Mr25 clogging daily Mr2 When it is determined that the temperature is higher than the above, it is determined that the temperature inside the refrigerator will increase 2 hours after the current time, and the content value of Mr24, that is, the average temperature inside the refrigerator for 1 hour stored at this time. Is higher than the average internal cold storage temperature in one day, this is used to determine that the current internal cold storage temperature is high. Then, when one of these one of determination result is obtained, as it can be seen from step S _48, while on the compressor, the flag P "1" and then and initial value precooling operation execution time count value Pt The precooling operation is started with "0". If this precooling operation is started, the flag P is "1", the compressor regardless of the step S ₁₈ is the inside temperature because not executed (the freezing compartment temperature) is turned on. In this pre-cooling operation, the set temperature of the refrigerating room is set to about 3 ° C lower than that 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.

In addition, the defrosting operation is executed based on the determination result of step _S36 (steps _S37 and _S38 ). That is, at the time when step _S36 is executed, the memory areas Mr1 and Mr2 are 24 hours ago (at the same time on the previous day) and 23 hours ago (at the same time on the previous day 1
The average temperature in the refrigerator for one hour (after the time) is stored.
Thus, if the average storage temperatures inside the storage areas of the memory areas Mr1 and Mr2 are lower than the average storage temperature inside the memory area Mr25 for one day, the storage temperature will not rise for one hour from the present time. judge. Similarly, if the current average internal cold storage temperature (content value of Mr26) is smaller than the average daily internal cold storage temperature (content value of Mr25), the internal cold storage temperature at this time is kept low. Determine that 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 performed if the precooling operation is being executed (P = 1). However, if the integrated value Std exceeds 2 hours from the defrosting reference cycle Tdp, the precooling operation is stopped and the defrosting operation is executed (step S ₄₁ , step S ₃₇ , step S ₃₈ ). And Thus, if it is above the determined conditions are all satisfied at the step S _37, a time to be defrosted, rather than the temperature rise due to opening and closing of the door during the run to run and refrigerator at that end It is determined that the internal temperature does not rise excessively, and as described above, steps _S37 and _S38.
To start defrosting operation. Therefore, when the defrosting operation is executed, the internal temperature rise can be minimized, and the adverse effect on the food can be reduced.

[Effects of the Invention] As is apparent from the above description, the present invention relates to the result of the average temperature in the storage which is sequentially stored for each unit time, the average temperature in the storage for the unit time at the present time, and the average storage in the daily storage. The temperature can be used to determine when the internal temperature rises and when it does not, and the pre-cooling operation and defrosting operation are executed based on the results of the timing determination. When trapped, the inside of the refrigerator can be sufficiently cooled by the pre-cooling operation, and when performing the defrosting operation, the defrosting operation can be performed at a time when the temperature inside the refrigerator does not rise, As a whole, the temperature rise in the refrigerator 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 circuit, compressor on-time integration means, average temperature calculation means, storage means, pre-cooling operation control means, defrosting operation control means), 2 is a freezer compartment temperature determination circuit, and 5 is A defrosting end temperature determination circuit, 8 is an inside temperature 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.
Compressor drive control means for turning off, compressor on-time integrating means for integrating the compressor on-time, average temperature calculating means for calculating the average cold storage temperature in a set unit time and the average cold storage temperature in one day, The storage means for sequentially moving and storing the average in-compartment temperature in the unit time to the table-formed memory every time the unit time elapses and the average in-compartment temperature in the unit time stored 22 hours before the present time are equal to each other. When the average inside temperature is higher than the average daily inside temperature or the currently stored average temperature inside the unit per hour is higher than the average daily inside temperature, the compressor is turned on regardless of the inside temperature and the compressor is activated by the operation end command. The pre-cooling operation control means to be turned off, and the average in-chamber temperature of the unit time stored 24 hours before and 23 hours before from the present time are both smaller than the average temperature in the day. The average cold storage temperature per unit time at the present time is lower than the average cold storage temperature for one day, and the integrated value of the compressor on time at the current time is within the set range with respect to the preset defrosting reference cycle, and further An operation control system for a refrigerator comprising: a defrosting operation control means for turning off the compressor, turning on the defrosting heater, and turning off the defrosting heater in response to a defrosting end detection input when the pre-cooling operation is not executed.