JP3593474B2 - Refrigerator control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control a rotational speed of a fan and to prevent a consumption of a wasteful energy by providing a fan drive-deciding unit for driving the fan when a fan control deviation calculated by a fan control deviation calculator is larger than a predetermined value and stopping the fan when the deviation is smaller than the value. SOLUTION: Whether or not a temperature of a cooler (R evaporator) 10 for a cold storage chamber (R chamber) 4 is lower than (an air temperature of the chamber 4+α (e.g. α =-2 deg.C)) is decided by a cold storage chamber cooler temperature deviation calculating means. If the temperature of the cooler is lower than the given temperature, a blower (R fan) 11 for cooling the chamber is operated. The R fan 11 is stopped until the temperature of the R evaporator 10 is further cooled by 2 deg.C from the air temperature of the chamber 4, and hence even if a compressor 17 is operated at a highly rotational speed, the R fan 11 does not start operating. That is, if an R fan control deviation of a difference between an R indoor temperature of the chamber 4 calculated by the means and a detected temperature of the R evaporator 10 is larger than the α, the R fan 11 is operated, or if the deviation is smaller than the α, the fan 11 is stopped.

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention has a refrigerating cycle in which refrigerant discharged from a compressor passes through a condenser and a cooler and returns to the compressor again , and controls a refrigerator that cools by circulating air cooled by the cooler with a fan. It is about the method .
[0002]
[Prior art]
In a conventional refrigerator, a fan is operated in synchronization with the operation of a compressor to blow air cooled by a cooler. Further, the fan speed was determined in proportion to the capacity of the compressor and the outside air temperature.
[0003]
[Problems to be solved by the invention]
FIG. 3 shows changes in air temperature when a refrigerator and a freezer are alternately cooled when a load is applied in a conventional refrigerator.
Conventionally, priorities were not given to the refrigerator compartment and the freezer compartment. Therefore, when a load was applied to the freezer compartment, the air temperature rose not only to the freezer compartment but also to the refrigerator compartment.
In view of the above problems, an object of the present invention is to stabilize the air temperature in the refrigerator compartment by giving priority to cooling the refrigerator compartment.
[0004]
[Means for Solving the Problems]
The invention according to claim 1 is a compressor for compressing a refrigerant, a condenser for condensing the refrigerant from the compressor, a refrigerator cooler for cooling a refrigerator, and a refrigeration system for cooling a freezer. A room cooler, a fan that blows the air cooled by the refrigerator cooler to the refrigerator compartment, a fan that blows the air cooled by the freezer cooler to the refrigerator compartment, and cools the refrigerant from the condenser into the refrigerator compartment. And a refrigerant supply device for supplying a refrigerator or a freezer compartment cooler, wherein each step from start to end is performed at regular intervals, and after the start, the current cooling state is refrigerated. A first step of confirming whether the room is being cooled or the refrigerator is being cooled, and a second step of comparing the refrigerator room air temperature with the refrigerator room cooling end temperature when it is confirmed in the first step that the refrigerator is being cooled. Refrigerator air in the second step When the temperature is lower than the refrigerator compartment end temperature, the third step switches to the freezer compartment cooling and shifts to the end step. When the refrigerator compartment air temperature is higher than the refrigerator compartment cool end temperature in the second step, the refrigerator compartment set temperature The fourth step is to compare the freezer compartment air temperature deviation obtained by subtracting the freezer compartment air temperature from the freezer compartment air temperature from the freezer compartment set temperature. If the freezer compartment air temperature deviation is smaller, the process proceeds to the end step after switching to the freezer compartment cooling, and if the refrigerating compartment air temperature deviation is larger in the fourth step, the process proceeds to the end step. And a seventh step of comparing the refrigerating compartment air temperature with the refrigerating compartment cooling start temperature when it is confirmed in the first step that the freezing compartment is being cooled. When the refrigerator compartment air temperature is lower than the refrigerator compartment cooling start temperature in the seventh step, the eighth step shifts to the end step, and in the seventh step when the refrigerator compartment air temperature is higher than the refrigerator compartment cooling start temperature. Is a ninth step of comparing the freezer compartment air temperature with the freezer compartment cooling end temperature, and, if the freezer compartment air temperature is lower than the freezer compartment cooling end temperature in the ninth step, switching to the refrigerator compartment cooling and then to the end step The tenth step to be shifted, the ninth step, when the freezer compartment air temperature is higher than the freezer compartment cooling end temperature, the eleventh step of comparing the freezer compartment air temperature deviation with the refrigerator compartment air temperature deviation, and the eleventh step If the freezer compartment air temperature deviation is smaller than the refrigerating compartment air temperature deviation, the twelfth step shifts to the end step after switching to the refrigerator compartment cooling and the eleventh step, A thirteenth step of shifting to an end step if the degree deviation is larger than the refrigerator compartment air temperature deviation.
When a refrigerator of claim 1, by preferentially controlled to the refrigerating compartment is cooled between the cooling start temperature of the cooling end temperature, it is possible to prevent freezing by excessive cooling of the refrigerating compartment.
[0005]
BEST MODE FOR CARRYING OUT THE INVENTION
( Reference example )
Hereinafter, an exemplary embodiment of the present invention will be described with reference to FIGS.
[0006]
1. First, a schematic configuration of a refrigerator main body 1 and a refrigerating cycle 2 is shown in FIG.
[0007]
The refrigerator main body 1 is constituted by a heat-insulating housing, and the inside thereof is partitioned by a heat-insulating partition wall 3 into an upper refrigerating room (hereinafter referred to as R room) 4 and a lower freezing room (hereinafter referred to as F room) 5. ing. Inside the R chamber 4, a duct 7 is formed by a partition plate 6 at the back, and a vegetable room 9 is formed by a partition plate 8 at a lower portion.
[0008]
A cooler for a refrigerator (hereinafter referred to as R-eva) 10 of the refrigeration cycle 2 is provided in a lower portion of the duct 7, and a blowout port 6 a is formed in an upper portion of the partition plate 6. A cooling room cooling blower (hereinafter, referred to as an R fan) 11 is provided at the outlet 6a. A suction port 6b for communicating the duct 7 with the vegetable room 9 is formed below the partition plate 6, and a communication port 8a for communicating the R room 4 and the vegetable room 9 is formed in the partition plate 8. ing.
[0009]
In the F chamber 5, a duct 13 is formed by a partition plate 12 at the back thereof, and a cooler for a freezing chamber of the refrigerating cycle 2 (hereinafter, referred to as F Eva) is provided in a lower part of the duct 13. 14 are provided. An outlet 12a is formed in an upper part of the partition plate 12, and a freezer-cooling blower (hereinafter, referred to as an F fan) 15 is provided at the outlet 12a. In addition, a suction port 12 b that communicates the duct 13 with the F chamber 5 is formed below the partition plate 12.
[0010]
In addition, a machine room 16 is formed at the lower part of the refrigerator main body 1, and a compressor 17 of the refrigeration cycle 2 is arranged at the back of the machine room 16.
[0011]
2. Configuration of Refrigeration Cycle The refrigeration cycle 2 includes a condenser 18, a refrigerant supply device 19 including a three-way valve, and capillary tubes 20, 21 in addition to the R-eva 10, the F-eva 14, and the compressor 17.
[0012]
In this case, the outlet of the compressor 17 passes through the condenser 18, and one outlet of the refrigerant supply device 19 passes through the capillary tube 20, the Reva 10, the connection pipe 22, and the Feva 14 to suction the compressor 17. It is communicated with the mouth.
[0013]
Further, the other outlet of the refrigerant supply device 19 is connected to an intermediate portion of the connection pipe 22 via the capillary tube 21.
[0014]
3. FIG. 2 is a schematic block diagram of the present embodiment.
[0015]
The compressor 17 starts operating by the compressor control means 25 which controls the operation of the compressor 17 according to conditions such as the temperature in the refrigerator.
[0016]
The compressed refrigerant is supplied to the R-eva 10 or the F-eva 14 via the refrigerant supply device 19.
[0017]
When the refrigerant is supplied to the coolers 10 and 14, the cooler temperature gradually starts to decrease, and the fans 11 and 15 start operating based on the internal temperature and the set temperature / cooler temperature.
[0018]
(1) Control on the R Room First, the control on the R room 4 will be described.
[0019]
The refrigerating room setting air temperature input means 30 sets the inside temperature of the R room 4.
[0020]
The refrigerating compartment air temperature detecting means 31 detects the temperature in the R compartment of the R compartment 4.
[0021]
The refrigerator compartment cooler temperature detecting means 32 detects the temperature of the R-eva 10.
[0022]
The refrigerating room air temperature deviation calculating means 33 calculates the deviation between the set temperature of the R room 4 and the actual R refrigerator temperature.
[0023]
The refrigerator compartment cooler temperature deviation calculating means 34 calculates the R fan control deviation which is the difference between the temperature in the R chamber of the R chamber 4 and the detected temperature of the R evaporator 10, and these calculation results are used to determine the operation of the refrigerator compartment fan. It is input to the means 35 and controls the operation / stop of the R fan 11 according to the R fan control deviation. This will be described later.
[0024]
(2) Control on F Room Next, control on the F room 5 will be described.
[0025]
The freezer compartment setting air temperature input means 40 sets the temperature in the F compartment of the F compartment 5.
[0026]
The freezing room air temperature detecting means 41 detects the temperature in the F chamber of the F chamber 5.
[0027]
The freezer compartment cooler temperature detecting means 42 detects the temperature of the Feva 14.
[0028]
The freezing room air temperature deviation calculating means 43 calculates the deviation between the set temperature of the F chamber 5 and the actual F refrigerator temperature.
[0029]
The freezer compartment cooler temperature deviation calculating means 44 calculates an F fan control deviation which is a difference between the temperature in the F chamber of the F chamber 5 and the temperature detected by the F evaporator 14, and these calculation results are used to determine the operation of the freezer compartment fan. It is input to the means 45 and controls the operation / stop of the freezer compartment fan 15 according to the F fan control deviation. This will be described later.
[0030]
(3) Content of Control Next, the control will be specifically described.
[0031]
This control is always performed not only at the time of the initial start of the refrigerator but also at a constant cycle (for example, every one minute).
[0032]
Whether the temperature of the R evaporator 10 is lower than the air temperature of the R chamber 4 + α (for example, α = −2 ° C.) is determined by the refrigerator compartment cooler temperature deviation calculating means 34, and if it is low, the R fan 11 is operated. Further, the R fan 11 is stopped until the temperature of the R evaporator 10 further cools down by 2 ° C. from the air temperature of the R chamber 4, and the R fan 11 does not start operating even if the compressor 17 is operating at a high speed. Like that.
[0033]
That is, if the R fan control deviation, which is the difference between the R chamber 4 internal temperature of the R room 4 and the detected temperature of the R evaporator 10 calculated by the refrigerator compartment cooler temperature deviation calculation means 34, is larger than α, the R fan 11 Drive and stop if small.
[0034]
As described above, in the present embodiment, it is confirmed that the rotation speed of the R fan 11 is not directly determined from the compressor 17 but the compressor 17 is operated and the refrigerant is supplied to the R evaporator 10 and the R evaporator 10 is cooled. In order to start driving, wasteful energy is not consumed.
[0035]
The control of the operation / stop of the F fan 15 is the same as the control of the R fan 11 described above, and therefore the description thereof will be omitted.
[0036]
(Example)
Next, examples will be described.
[0037]
FIG. 3 shows a conventional example, and FIG. 4 shows an air temperature change when the R chamber 4 and the F chamber 5 are alternately cooled when a load is applied in the refrigerator of the present embodiment.
[0038]
Conventionally, priorities were not given to the R chamber 4 and the F chamber 5, so that when a load was applied to the F chamber 5, the air temperature increased not only to the F chamber 5 but also to the R chamber 4.
[0039]
In the present embodiment, the purpose is to stabilize the air temperature in the R chamber 4 by giving priority to the R chamber 4.
[0040]
Next, the operation of the present embodiment will be described with reference to the flowchart of FIG.
[0041]
In FIGS. 7 and 8, TRon is the refrigerator compartment cooling start temperature, TRoff is the refrigerator compartment cooling end temperature, TFon is the freezer compartment cooling start temperature, and TFoff is the freezer compartment cooling end temperature.
[0042]
More specifically, the following control is performed at a constant cycle (for example, at one-minute intervals).
[0043]
First, as shown in step S21 of FIG. 8, it is checked whether the current cooling state is cooling the refrigerator compartment or cooling the freezer compartment. If the refrigerator compartment is being cooled, the process proceeds to step S22. If the refrigerator compartment air temperature TRa is equal to or lower than the refrigerator compartment end temperature TRoff, the process proceeds to step S28 to forcibly switch the valve (refrigerant supply device 19) to the freezer compartment cooling.
[0044]
If it is determined in step S22 that the refrigeration compartment air temperature TRa is equal to or higher than the refrigeration compartment cooling end temperature TRoff, the process proceeds to step S23, and the refrigeration compartment air temperature deviation eR (refrigeration compartment set temperature-refrigeration compartment air temperature) is changed to the freezing compartment temperature. If it is smaller than the air temperature deviation eF (freezer compartment set temperature-freezer compartment air temperature), the valve is switched to freezer compartment cooling in step S28.
[0045]
If it is determined in step S21 that the freezer compartment is being cooled, the process proceeds to step S24. If the refrigerator compartment air temperature TRa is lower than the refrigerator compartment cooling start temperature TRon, the switching of the valves is restricted (the valve switching control is not performed).
[0046]
In step S24, when the refrigerator compartment air temperature TRa is higher than the refrigerator compartment cooling start temperature TRon, and the freezer compartment air temperature TFa is lower than the freezer compartment cooling end temperature TFoff and the refrigerator compartment air temperature TRa is equal to or higher than the refrigerator compartment cooling start temperature TRon ( (Steps S25 and S27 are referred to), and the process proceeds to step S29 to switch the valve to the refrigerator compartment cooling.
[0047]
Next, in step S25, if the freezer compartment air temperature TFa is higher than the freezer compartment cooling end temperature TFoff, the process proceeds to step S26, in which the freezer compartment air temperature deviation eF (freezer compartment set temperature-freezer compartment air temperature) is reduced. If it is smaller than the air temperature deviation eR (refrigerator compartment set temperature-refrigerator compartment air temperature), the process proceeds to step S29 and the valve is switched to refrigerator compartment cooling.
[0048]
In other words, the R chamber 4 is preferentially controlled so as to be cooled between the cooling start temperature and the cooling end temperature.
[0049]
This is because the R chamber 4 is controlled in a temperature zone around 0 ° C., and may freeze if cooled too much. When there is a change in the cooling load of the R room 4 or the F room 5, it becomes possible by absorbing the fluctuation with the cooling capacity of the freezing room temperature.
[0050]
【The invention's effect】
When a refrigerator of claim 1, by preferentially controlled to the refrigerating compartment is cooled between the cooling start temperature of the cooling end temperature, it is possible to prevent freezing by excessive cooling of the refrigerating compartment.
[Brief description of the drawings]
FIG. 1 is a diagram showing a schematic configuration of a refrigerator body and a refrigeration cycle according to one embodiment of the present invention.
FIG. 2 is a schematic block diagram of a first embodiment of the present invention.
FIG. 3 is a diagram illustrating a change in temperature of a refrigerator / freezer when a load is applied according to the related art and the present invention.
4 is a flow chart of the present embodiment.
[Explanation of symbols]
Reference Signs List 10 refrigerator compartment cooler 11 refrigerator compartment fan 14 refrigerator compartment cooler 15 refrigerator compartment fan 17 compressor 31 refrigerator compartment air temperature detecting means 32 refrigerator compartment cooler temperature detecting means 33 refrigerator compartment air temperature deviation calculating means 34 refrigerator compartment cooler temperature Deviation calculating means 35 Refrigerator compartment fan operation determining means 36 Refrigerator compartment air temperature hysteresis adding means 37 Refrigerator compartment cooler temperature hysteresis adding means 38 Refrigerator compartment air temperature deviation hysteresis adding means 39 Refrigerator compartment cooler temperature deviation hysteresis adding means 41 Freezer compartment Air temperature detecting means 42 Freezing room cooler temperature detecting means 43 Freezing room air temperature deviation calculating means 44 Freezing room cooler temperature deviation calculating means 45 Freezing room fan operation determining means 46 Freezing room air temperature hysteresis adding means 47 Freezing room cooler Temperature hysteresis adding means 48 Freezer compartment air temperature deviation hysteresis adding means 4 9 Freezer compartment cooler temperature deviation hysteresis adding means

Claims (1)

A compressor for compressing the refrigerant,
  A condenser for condensing the refrigerant from the compressor;
  A refrigerator compartment cooler for cooling the refrigerator compartment;
  A freezer compartment cooler for cooling the freezer compartment;
  A fan for blowing air cooled by the refrigerator compartment cooler to the refrigerator compartment,
  A fan that sends air cooled by the freezer cooler to the freezer,
  A refrigerant supply device for supplying the refrigerant from the condenser to the refrigerator compartment cooler or the freezer compartment cooler,
  In a method for controlling a refrigerator comprising:
  Each step from start to end is performed at regular intervals,
  A first step of checking whether the current cooling state is cooling the refrigerator compartment or cooling the freezer compartment following the start;
  A second step of comparing the refrigerating compartment air temperature with the refrigerating compartment cooling end temperature when it is confirmed in the first step that the refrigerating compartment is being cooled;
  A third step in which in the second step, when the refrigerator compartment air temperature is lower than the refrigerator compartment cooling end temperature, the process switches to freezer compartment cooling and shifts to an end step;
  When the refrigerator compartment air temperature is higher than the refrigerator compartment cooling end temperature in the second step, the refrigerator compartment air temperature deviation obtained by subtracting the refrigerator compartment air temperature from the refrigerator compartment set temperature is obtained by subtracting the freezer compartment air temperature from the freezer compartment set temperature. A fourth step of comparing the freezer compartment air temperature deviation;
  A fifth step in which, if the refrigerating compartment air temperature deviation is smaller than the freezing room air temperature deviation in the fourth step, the process shifts to freezing room cooling and then proceeds to an end step;
  A sixth step of shifting to the end step if the refrigeration compartment air temperature deviation is larger than the freezer compartment air temperature deviation in the fourth step;
  A seventh step of comparing the refrigerating compartment air temperature with the refrigerating compartment cooling start temperature when it is confirmed in the first step that the freezing compartment is being cooled;
  When the refrigerator compartment air temperature is lower than the refrigerator compartment cooling start temperature in the seventh step, an eighth step proceeds to an end step;
  A ninth step of comparing the freezer compartment air temperature with the freezer compartment cooling end temperature when the refrigerator compartment air temperature is higher than the refrigerator compartment cooling start temperature in the seventh step;
  When the freezer compartment air temperature is lower than the freezer compartment cooling end temperature in the ninth step, a tenth step in which the process is switched to the refrigerator compartment cooling and then proceeds to the end step;
  An eleventh step of comparing the freezer compartment air temperature deviation and the refrigerator compartment air temperature deviation when the freezer compartment air temperature is higher than the freezer compartment cooling end temperature in the ninth step;
  A twelfth step in which, if the freezer compartment air temperature deviation is smaller than the refrigerating compartment air temperature deviation in the eleventh step, the process proceeds to the end step after switching to the refrigerating compartment cooling;
  If the freezer compartment air temperature deviation is larger than the refrigerator compartment air temperature deviation in the eleventh step, a thirteenth step proceeds to an end step;
  Having
  A method for controlling a refrigerator, comprising:

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