JPH0621759B2 - Refrigerator temperature controller - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a temperature control device for a refrigerator, and more particularly to a temperature control device for a home or small-sized business refrigerator.

[Prior Art] Conventionally, as a temperature control device of this type of refrigerator, one shown in FIGS. 5 to 7 has been considered. In the figure, 1
Is a temperature detection element such as a thermistor that detects the temperature inside the refrigerator,
Reference numeral 2 is a variable resistor for setting the temperature inside the refrigerator detected by the temperature detecting element 1, 3 is a temperature judging section for judging by inputting signals from the temperature detecting element 1 and variable resistor 2, and 4 is this temperature. A microcomputer (hereinafter referred to as a microcomputer), which is a control computer for inputting the determination result from the determination unit 3, 5 is a relay drive circuit to which the output of the microcomputer 4 is input, and 6 is driven by the relay drive circuit 5. A relay 7 is a contact of the relay 6, which is closed when the relay 6 is excited and opened when it is not excited. Reference numeral 8 is a power source, and 9 is a compressor to which power is supplied from the power source 8 when the contact 7 of the relay 6 is closed.

Next, the operation will be described. First, the temperature determination unit 3 compares the signal from the temperature detecting element 1 with the signal from the variable resistor 2 (comparing both resistance values), that is, if the temperature is lower than the set temperature (the resistance value of the temperature detecting element 1). If the temperature inside the refrigerator is higher than the set temperature (if the resistance value of the variable resistor 2 is higher), H (High level) is sent to the microcomputer 4. ) Signal. Upon receiving the signal from the temperature determination unit 3, the microcomputer 4 outputs an H or L signal to the relay drive circuit 5 according to the signal. At this time, if the signal from the temperature determination unit 3 is H, an H signal is output to the relay drive circuit 5, the relay 6 is excited, and the contact 7 is closed. As a result, the compressor 9 is driven by the electric power supplied from the power source 8 to cool the inside of the refrigerator. On the contrary, if the signal from the temperature determination unit 3 is L, the microcomputer 4 outputs the L signal to the drive circuit 5.
While this L signal is being output to the relay drive circuit 5,
The relay 6 is de-energized, the relay contact 7 is opened, and the compressor is stopped.

As described above, the set temperature set by the variable resistor 2 and the internal temperature detected by the temperature detecting element 1 are constantly compared to control the drive of the compressor 9 to keep the internal temperature at a constant temperature.

FIG. 6 is a schematic flowchart showing a control program for the refrigerator stored in the microcomputer 4. First,
In the initial routine of step 100, each memory inside the microcomputer 4 is reset, the initial output is set, and the initial setting is performed. Then, the process proceeds to the main routine of steps 200, 300 and 400, and the above temperature control is performed. That is, after reading various input signals and judging the input signals, the output signal is set based on the judgment result.

FIG. 7 is a flow chart showing the details of the input determination operation in step 300. Here, it is determined whether or not the signal from the temperature determination part 3 is H (step 301). If the signal is H, compression is performed. The machine operation flag is set (step 302), and if L, the compressor operation flag is reset (step 303). Then, in response to the setting and resetting of the compressor operation flag, step 40 in FIG.
At 0, the output of the relay drive circuit 5 is set.

[Problems to be Solved by the Invention] In the conventional control device, the temperature at one location in the refrigerator is detected and treated as the representative temperature, and the temperature is controlled. There is a problem that the temperature cannot be controlled sufficiently.

The present invention has been made in order to solve the above problems, and provides a temperature control device for a refrigerator that can detect the temperature inside the refrigerator more appropriately and set the temperature inside the refrigerator more appropriately. The purpose is.

[Means for Solving Problems] A temperature control device for a refrigerator according to the present invention includes a temperature detection element for detecting temperatures at a plurality of places in the refrigerator, a compressor based on the temperature detected by the temperature detection element, and A control circuit for controlling the drive of a fan, wherein the control circuit controls the drive of the compressor according to a difference between a representative value of temperature detection values at a plurality of places in the refrigerator and a set temperature, and The fan is driven when the difference between the maximum value and the minimum value of the temperature detection values at a plurality of places in the refrigerator exceeds a certain value.

[Operation] With the above configuration, even when the refrigerator has a variation in temperature due to an arrangement state of items stored for refrigeration,
By the temperature detection element that detects the temperature of multiple places in the refrigerator, the temperature of multiple places is detected, the representative value of the temperature inside the refrigerator is determined and obtained, and the drive control of the compressor and fan is performed by this representative value. When the temperature inside the refrigerator can be easily kept within a predetermined range to cool the contents efficiently, and the difference between the maximum and minimum temperature detection values at multiple points in the refrigerator exceeds a certain value. Since the fan is driven, it is possible to control the drive of the fan to make the temperature inside the refrigerator uniform.

[Embodiment] A temperature control device for a refrigerator according to the present invention will be described below with reference to an embodiment.

FIG. 1 is a circuit configuration diagram of an embodiment. Reference numerals 1 to 9 are the same as or equivalent to those of the conventional apparatus, and the same reference numerals are used to avoid duplication of description. 10 to 12 are resistors connected in series with the temperature detecting elements 1 and 1a and the internal temperature setting variable resistor 2 respectively, and 13a, 13b, and 13c are the resistors 10 respectively.
To 12 are connected to the temperature detecting elements 1 and 1a, an analog input port for inputting signals from the internal temperature setting variable resistor 2, 13 is the analog input ports 13a and 13b,
A microcomputer, which is a computer forming an electronic control circuit having 13c, and temperature detecting elements 1 and 1 installed in the refrigerator.
The detection value of the detection element of a and the variable resistor 2 for setting the internal temperature
Set the setting value of the above to the analog input ports 13a, 13b, 1
It is designed to read from 3c. And 13d,
13e is an output port of the microcomputer 13, a fan relay drive circuit 14 is connected to the output port 13d of the microcomputer 13, and a compressor relay drive circuit 5 is connected to the output port 13e. Drive circuit 1
4, a fan relay connected to 4, a compressor relay connected to the fan relay 15, and a fan 17.

FIG. 3 is a sectional view of the refrigerator 18. The temperature detecting elements 1 and 1a are arranged in the freezer compartment 20, and the refrigerator 18
A control device 19 having the above-mentioned circuit configuration is attached to the back surface of the.

Next, the operation of the refrigerator temperature control device having the above-described configuration will be described with reference to the flowchart in FIG.

FIG. 2 is a schematic flowchart of the input determination of the control program stored in the microcomputer 13, step 5
01 to set the temperature inside the cabinet to the analog input port 1 of the microcomputer 13.
3a and 13c are read, and the average value, the maximum value or the minimum value of the input data is set as the representative value of the detected value of the internal cold storage temperature. In step 502, the set temperature is compared with the internal temperature, and if the internal temperature is higher, the compressor flag is set (step 503). If the set temperature is higher,
The compressor operation flag is reset (step 504).

As described above, the temperature inside the refrigerator is detected by the plurality of temperature detecting elements 1 and 1a, and the drive control of the compressor 9 is performed, whereby the proper temperature control can be performed. In the embodiment of the present invention, the drive of the compressor is controlled according to the detected values of the temperature detecting elements 1 and 1a. However, as shown in FIG. Thirteen
It is read from c and it is judged whether or not the difference is larger than a fixed value (step 505), and if it is large, it is judged that the variation in the internal temperature is large, and the fan operation flag is set (step 506).

As a result, it is possible to control the drive of the fan so as to make the temperature inside the refrigerator uniform.

[Advantages of the Invention] As described above, according to the present invention, the temperature detection element for detecting the temperature at a plurality of locations in the refrigerator and the drive of the compressor and the fan are controlled based on the temperature detected by the temperature detection element. A control circuit for controlling the compressor according to a difference between a representative value of temperature detection values at a plurality of places in the refrigerator and a set temperature, and Since the fan is driven when the difference between the maximum value and the minimum value of the temperature detection value at a certain point exceeds a certain value, the temperature inside the refrigerator can be easily kept within a predetermined range and the stored items can be cooled efficiently. In addition, it is possible to control the drive of the fan to make the temperature inside the refrigerator uniform.

[Brief description of drawings]

FIG. 1 is a circuit configuration diagram showing this embodiment, FIG. 2 is a schematic flow chart of input determination of the same embodiment, FIG. 3 is a sectional view of the refrigerator, and FIG. 4 is input determination of other embodiment. FIG. 5 is a schematic block diagram showing a conventional example, FIG.
FIG. 7 and FIG. 7 are schematic flowcharts of a conventional example. In the figure, 1 and 1a are temperature detecting elements, 2 is a variable resistor, and 5,
14 is a relay drive circuit, 6 and 15 are relays, 7 and 16 are contacts, 8 is an AC power supply, 9 is a compressor, 13 is a microcomputer, 1
7 is a fan, 18 is a refrigerator, 19 is a control device, and 20 is a freezer. In the drawings, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Claims] 1. A refrigerator temperature control device comprising a temperature detection element for detecting temperatures at a plurality of locations in a refrigerator, and a control circuit for controlling driving of a compressor and a fan based on the temperature detected by the temperature detection element. The control circuit drives and controls the compressor according to the difference between the representative value of temperature detection values at a plurality of places in the refrigerator and the set temperature, and the maximum temperature detection value at a plurality of places in the refrigerator. A temperature control device for a refrigerator, wherein the fan is driven when the difference between the minimum value and the minimum value exceeds a certain value.