JPH05141838A - Temperature controller of cold storage box - Google Patents

Abstract

PURPOSE:To provide a cold storage box temperature controller that detects an increase of an indoor load to a refrigerating chamber and correcting the temperature of control for the refrigerating chamber based on the value of the increase and the ambient temperature and, at the same time, controlling the actions of a blower and compressor by the corrected temperature of control. CONSTITUTION:The objective temperature controller is provided with a temperature determination section 58 that corrects a set temperature of the refrigerating chamber based on auxiliary temperature TS that is detected by an auxiliary temperature sensor 52 and outdoor temperature TB detected by an outdoor temperature sensor 56 and determines control temperature TK and a control signal output section 59 that outputs control signal to control the actions of the compressor motor 61 and blower motor 62 based on the control temperature TK and the main temperature TM of the refrigerating chamber that is detected by a main temperature sensor 51.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature control device for a refrigerator.

[0002]

2. Prior Art Japanese Patent Publication No. 3-51989 prior to the present invention.
The publication discloses a refrigerator provided with a temperature compensating circuit for changing a chilled temperature reference value and a refrigerating temperature reference value of a drive control circuit for driving and controlling a damper device based on a temperature detection value by an outside temperature sensor. There is. This temperature compensating circuit relates to the temperature control of the specification switching chamber which is set to be switched between the freezing chamber specification, the chilled chamber specification and the refrigerating room specification, and the specification switching chamber used for temperature compensation. The purpose is to eliminate the need for a heater for heating the sensor.

[0003]

In the refrigerator disclosed in the above publication, the temperature compensating circuit is based on only the outside temperature detected by the outside temperature sensor regardless of the temperature change in the specification selection chamber. Since the temperature reference value is changed,
There is a problem in that it is not possible to detect an increase or decrease in the internal load of the specification selection room such as when food is put into the specification selection room, and it is not possible to perform accurate temperature control based on the increase or decrease of the internal load. Further, since the temperature control of the storage rooms other than the specification selection room is not taken into consideration, there is a problem that the change of the temperature reference value is not used for the temperature control of the other storage rooms.

Therefore, according to the present invention, an increase in the freezer load is detected, the control temperature of the freezer is corrected based on the increase amount of the freezer load and the outside temperature, and at the same time, another storage room such as a refrigerating room or an ice greenhouse is provided. An object of the present invention is to provide a temperature control device for a refrigerator that can be effectively used for the temperature control of the refrigerator.

[0005]

SUMMARY OF THE INVENTION The present invention is directed to a compressor for supplying a refrigerant to an evaporator, a blower for supplying cold air cooled by the evaporator to a freezer compartment, and the compressor based on the temperature of the freezer compartment. In a refrigerator equipped with a control device for controlling the operation of the blower, the control device comprises temperature setting means for setting the temperature of the freezing compartment, a main temperature sensor and a sub temperature sensor for detecting the temperature of the freezing compartment, and a refrigerator. An outside temperature sensor for detecting the outside temperature, and a control means for outputting a control signal for controlling the operation of the compressor and the blower based on the set temperature, the outside temperature, the main temperature and the sub temperature, and the control means. A temperature determination unit that corrects a set temperature based on the sub temperature and the outside temperature to determine a control temperature, and a control signal output unit that outputs the control signal based on the control temperature and the main temperature. Providing a refrigerator temperature control device It is intended to.

[0006]

The temperature determining unit determines the control temperature by appropriately correcting the set temperature of the temperature setting means based on the sub-temperature of the freezer compartment detected by the sub-temperature sensor and the outside temperature detected by the outside-temperature sensor. The sub-temperature acts as data that captures temperature changes in the freezer, and since this data can be used to understand load changes in the freezer, the control temperature is determined according to load changes and outside temperature changes. be able to. Then, the control signal means is a control signal based on the main temperature of the freezer compartment detected by the main temperature sensor and the control temperature that takes into account the load fluctuation that does not exist in the reference temperature that is changed only based on the outside temperature as in the prior art. Is output, it is possible to control the operation of the compressor and the blower based on the load fluctuation of the freezing compartment and the temperature fluctuation of the outside of the refrigerator, and at the same time, it can be used for the temperature control of other storage compartments.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

Reference numeral 1 denotes a household refrigerator, which is composed of a heat insulating box 2 having a front opening which constitutes its main body, and doors 3, 4, 5, 6, 7, 8 for closing the opening. There is.

Reference numeral 11 denotes a horizontal partition wall that divides the inside of the heat insulating box 2 into upper and lower parts. In this embodiment, the upper part of the horizontal partition wall 11 is a freezing chamber 12 that is cooled to a freezing temperature, and the lower part is a temperature that does not freeze food. The storage room is to be cooled. The storage chamber is further divided into upper and lower parts by a pre-partitioning member 13 and a partition plate 14, a refrigerating chamber 15 is cooled above the partition plate 14 to a temperature of about 3 ° C., and a lower part thereof is at a temperature of about -1 ° C. to 7 ° C. The selection chamber 16 in which the temperature can be set in the band is used.

The doors 3 and 4 are rotatable doors corresponding to the freezer compartment 12, and the door 4 is provided with a partition body 17 for partitioning the opening of the freezer compartment into left and right. The doors 5 and 6 are pivotable doors corresponding to the refrigerating compartment 15, and the door 6 is provided with a partition 18 for partitioning the opening of the refrigerating compartment into left and right.

The doors 7 and 8 are drawer-type doors corresponding to the bottle chamber and the vegetable chamber, which are partitioned by the vertical partition wall 30 into the left and right in the selection chamber 16, and both doors are mainly for storing bottles and vegetables, respectively. Container 2 with open top
1, 22 are detachably provided.

At the back of the freezer compartment 12 is a cooler compartment formed by a cooler cover 31 and a heat insulating box 2. In this cooler compartment, a plate fin type evaporator (not shown) as a cooler and A blower 32 such as a sirocco fan is arranged. In addition, the cooler chamber is provided with the air outlet 3 formed in the cover 31.
3, 34 and 35 communicate with the freezing compartment 12, while the horizontal partition wall 11 communicates with the refrigerating compartment 15.

The freezer compartment 12 is divided into upper, middle and lower three stages by shelves 36 and 37, and the lower stage is vertically divided by a vertical partition plate 38. An automatic ice making machine 39 is arranged at the rear of the left side of the middle stage, and this rear space is called an ice making chamber. The ice making chamber is covered with the ice making machine cover 40 and is partitioned from the front part on the left side of the middle stage. Furthermore, the vertical partition plate 38
In the space on the left side of the container, a container 41 for storing ice produced by an automatic ice making machine is arranged so that it can be freely taken in and out. In the space on the right side of the vertical partition plate 38, a container 43 including a bottom plate 42, left and right side plates, and a back plate is arranged so as to be freely drawn out at a distance from the upper surface of the horizontal partition wall 11 serving as the bottom wall of the freezer compartment. This space is called a quick freezer. The bottom plate of this container is made of a metal plate having good thermal conductivity such as aluminum.

The cool air blown into the freezer compartment 12 returns to the lower part of the cooler compartment through the cool air return path 44 formed by the bottom plate 42 of the container 43 and the horizontal partition wall 11. Further, for convenience of the following description, the quick freezing chamber is referred to as a second freezing chamber 46, and the other freezing chambers are referred to as a first freezing chamber 45.

The first freezer compartment 45 is provided with two temperature sensors for detecting its temperature, one of the two is a main temperature sensor 51 provided in the vicinity of the air outlet 34, and The other of the two is a secondary temperature sensor 52 provided near the ice tray in the ice making chamber. Further, in the second freezing chamber 46, a temperature sensor 53 is provided near the outlet 35, and a load detection sensor 54 that comes into contact with the lower surface of the bottom plate 42 of the container 43 is provided.

Next, a temperature control device K for controlling the temperature of the first freezer compartment will be described with reference to the block circuit diagram of FIG.

Reference numeral 55 is a temperature setting means for setting the cooling temperature of the first freezer compartment 45 (hereinafter referred to as set temperature), and reference numeral 56 is an outside temperature sensor for detecting the temperature outside the refrigerator.

Reference numeral 57 is a set temperature TA of the temperature setting means 55,
Based on the outside temperature TB detected by the outside temperature sensor 56, the main temperature TM detected by the main temperature sensor 51, and the sub temperature TS detected by the sub temperature sensor 52, a compressor motor or the like for controlling the operation of the compressor. It is a microcomputer as a control unit that outputs a control signal for controlling the operations of the compressor driving unit 61 and the blower motor 62. In this embodiment, the master / slave temperature sensors 51, 52 and the outside temperature sensor 5
6. Control device K by temperature setting means 55 and control means 57
It is what constitutes.

The control means 57 controls the subordinate temperature TS and the outside temperature T.
A control temperature determining unit 58 for performing fuzzy inference based on B and determining a control temperature TK in which the set temperature TA is corrected,
The control signal output unit 59 outputs a control signal based on the determined control temperature TK and main temperature TM.

The temperature control operation by the temperature control device of the present invention based on the above configuration will be described with reference to the operation flowchart of FIG. The blower motor 62 can be controlled in three states of "high speed rotation / steady rotation / stop".

First, when the power is turned on, step S1
Enter the set temperature TA with and set temperature TA with step S2.
Is taken as the control temperature TK. Next, in step S3, it is determined whether or not the main temperature TM is higher than the control temperature TK.
An N signal is output to operate the compressor, and an ON signal for operating the blower motor 62 in steady rotation is output in step S5 to operate the blower 32 in steady operation, and the process proceeds to step S8. If not large in step S3, an OFF signal is output to the compressor driving means 61 to stop the compressor in step S6, an OFF signal is output to the blower motor 62 in step S7 to stop the blower 32, and the process returns to step S3. To do. The control operation in steps S1 to S7 is as follows.
There is no difference from the conventional temperature control operation, and the following step S
The control operation of the present invention is characterized by 8 to S12.

In step S8, the sub-temperature TS is the main temperature T.
It is determined whether the temperature is higher than M by a constant temperature C. If TS is higher than TM by a constant temperature or more, the process returns to step S3. If TS is higher than TM by a constant temperature or more, the blower motor 62 is rotated at high speed in step S9. Output a high-speed signal to calculate the temperature difference A between the slave temperature TS and the main temperature TM in step S10, sample the outside temperature TB, and perform fuzzy reasoning based on the TB sampled in step S11 and the calculated A. And the shift down amount B of the control temperature TK is determined. In step S12, T
The value obtained by subtracting B from K is set as the control temperature TK, the control temperature is corrected, and the process returns to step S3.

The constant temperature C is appropriately set according to the place where the secondary temperature sensor 52 is arranged and the capacity of the freezer compartment 12.

In the determination in step S8, TS is T
The fact that the temperature is higher than M by a certain temperature or more indicates that the temperature in the vicinity of the secondary temperature sensor has largely changed compared to the normal state due to the load application (corresponding to the water supply operation to the ice tray in this embodiment). The load input is determined by detecting this change. In order to suppress the temperature rise due to the load application, it is necessary to continuously operate the compressor and the blower. Therefore, in step S9, the blower motor 62 is rotated at a high speed to increase the amount of cold air supplied to the freezer compartment. Further, the shift down amount is determined in step S11 and the control temperature TK is lowered in step S12 so that the compressor and the blower are not stopped. By these, it becomes possible to suppress the temperature rise due to the load application as much as possible.

Next, the fuzzy inference in step S11 will be described. First, the membership function for the temperature difference A between the slave temperature TS and the master temperature TM is set to the variables [0, 5.
6] The input value (slightly high / high / very high) is normalized in the section [6], and the membership function for the outside temperature TB is input in the section of the variable [1.9, 32.5] (low・ The membership function for the shift amount B determined by the control rule described later is normalized to three values (appropriate and high), and the input value (small / slightly small / medium / slightly large) is entered in the interval of the variable [0, 3.4]. 6 and 7 are diagrams in which the definition of so-called fuzzy variables normalized to five types (large) is plotted.

The control rules for determining the shift amount B (nine rules from rules 1 to 9) are defined as shown in Table 1.

[0027]

[Table 1]

For example, the temperature difference A is "high" and the outside temperature T
When B is “low”, the shift amount B is determined to be “slightly large” according to Rule 4. On the other hand, when the temperature difference A is “slightly high” and the outside temperature TS is “appropriate”, the shift amount B is determined to be “slightly small” according to Rule 2. However,
When the actual numerical values are applied to the variables, two kinds of results are obtained as the temperature difference and two kinds are obtained as the outside temperature, and there are four combinations under the conditions, so the conclusion of the rule is obtained for each. Need to issue.
This conclusion is expressed as "shift amount, goodness of fit".

Next, the fuzzy inference process will be described with reference to FIGS. 6 and 7. First, the conclusion for each rule (that is, the shift amount B and its matching degree 0 to 1) is obtained by the MIN-MAX method.

For the rule, the smaller one (MIN) of the two input values corresponding to the two variables is set as the goodness of fit, and the output value of the rule is set as the shift amount B, whereby the rule is concluded. To do.

After all the conclusions are plotted on the basis of the goodness of fit and the shift amount B in all the conclusion values as shown in FIG. 6 (c), the center of gravity of the shaded area in the figure is taken as the center of gravity. The maximum degree of conformity (MAX) is determined as the shift amount B, and the temperature obtained by subtracting B from TK based on the determined shift amount B is determined as the control temperature TK. The output value of the unit 58 is used.

An example of the experimental value is shown. FIG. 6 (a),
As shown in (b), when the temperature difference A is 2 ° C. and the outside temperature TB is 7 ° C., the temperature difference A is “high, 0.6
25 "and" slightly high, 0.375 "were obtained, and the outside temperature TB was" low, 0.563 "and" appropriate, 0.437 ". When combining each result, there are four rules (rule numbers 1, 2,
4, 5) can be done, and therefore, for these rules, FIG.
As shown in (c), “slightly large” was inferred as the magnitude of the load and “2 ° C.” was inferred as the shift amount B by the MIN-MAX method. The control temperature TK from this 2 ° C.
Temperature control is performed assuming that 2 ° C. is subtracted from K.

As another example, as shown in FIGS. 7A and 7B, the temperature difference A is 4.4 ° C. and the outside temperature TB is 30 ° C.
If it is, the temperature difference A is “high, 0.62
5 "and" very high, 0.375 "were obtained, and two outside temperature TB results were obtained:" high, 0.687 "and" appropriate, 0.313 ". .. When combining each result, there are four rules (rule numbers 5, 6,
8 and 9) can be performed, and therefore, for these rules, FIG.
As shown in (c), the load is "slightly small".
However, “1.4 ° C.” was inferred as the shift amount B. Temperature control is performed by setting a value obtained by subtracting 1.4 ° C. from the previously determined TK from this 1.4 ° C. as a new control temperature TK.

Execution of such inference can be realized by using a general-purpose microcomputer or digital signal processor.

[0035]

As described above, according to the present invention, since the temperature determining unit corrects the set temperature of the freezer based on both the temperature (subordinate temperature) of the freezer and the outside temperature, the temperature around the refrigerator is reduced. The control temperature of the freezer can be determined by detecting not only the temperature but also the increase or decrease of the indoor load of the freezer. Further, since the compressor and the blower are controlled by the determined control temperature and the temperature (main temperature) of the freezing compartment, it is possible to control the temperature of the freezing compartment corresponding to the fluctuation of the internal and external loads of the freezing compartment. Especially in a refrigerator provided with an ice making chamber or a quick freezing chamber in the freezing chamber, the temperature control described above can be performed by also using the temperature sensor arranged in the ice making chamber or the quick freezing chamber as a sub-temperature sensor, so load application It is possible to suppress the temperature rise in the freezer compartment due to the above.

[Brief description of drawings]

FIG. 1 is a block circuit diagram of a temperature control device of the present invention.

FIG. 2 is an external perspective view showing a state in which the door of the refrigerator of the present invention is opened.

FIG. 3 is a perspective view showing a state in which a door of the refrigerator is removed.

FIG. 4 is a front view of a freezing room.

FIG. 5 is a flowchart showing a temperature control operation in the temperature control device.

FIG. 6 is a diagram for explaining a process of fuzzy inference using one example.

FIG. 7 is a diagram for explaining a process of fuzzy inference using another example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Refrigerator 12 Freezer 51 Main temperature sensor 52 Secondary temperature sensor 55 Temperature setting means 56 Outside temperature sensor 57 Control means 58 Temperature determination part 59 Control signal output part K Temperature control device

Claims (1)

[Claims] 1. A compressor for supplying a refrigerant to an evaporator, a blower for supplying cold air cooled by the evaporator to a freezer compartment, and a control for controlling the operation of the compressor and the blower based on the temperature of the freezer compartment. In a refrigerator provided with a device, the control device has temperature setting means for setting the temperature of the freezing compartment, a main temperature sensor and a sub temperature sensor for detecting the temperature of the freezing compartment, and an outside temperature for detecting the outside temperature. A sensor and a control means for outputting a control signal for controlling the operation of the compressor and the blower based on the set temperature, the outside temperature, the main temperature and the sub temperature,
The control means includes a temperature determination unit that corrects a set temperature based on the slave temperature and the outside temperature to determine a control temperature, and a control signal output unit that outputs the control signal based on the control temperature and the main temperature. And a temperature control device for a refrigerator.