JPH05126449A - Refrigerator controller - Google Patents

Abstract

(57) [Summary] [Structure] A temperature detecting element 3 for detecting the temperature inside the refrigerator, a control circuit 10 for controlling the temperature inside the refrigerator by the temperature detected by the temperature detecting element 3, a door opening detecting means 28, When the interior lighting lamps 26 and 27 for illuminating the interior and the door opening detection means 28 detect the door opening, if the temperature detected by the temperature detecting element 3 is out of a predetermined temperature range, the interior lighting. An abnormality display means 11 for displaying an abnormality by a lamp is provided. [Effect] If the temperature detection element that detects the temperature inside the refrigerator is abnormal, the abnormality is notified by the illumination lamp inside the refrigerator.
It is possible to reliably warn of an abnormality in the temperature detection element without providing new parts.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a refrigerator control device, and more particularly to an electronic control type refrigerator control device.

[0002]

2. Description of the Related Art FIGS.
The conventional refrigerator control device disclosed in Japanese Patent No. 0,019, in which a temperature detecting element 3 such as a thermistor is provided in a freezer compartment 2 of a refrigerator 1, and a variable resistor for setting an internal temperature is provided on a door surface. An operation panel 6 having a container 4 and a display element 5 for displaying an abnormality is provided. Reference numeral 7 is a temperature detecting means for detecting the temperature inside the refrigerator and the set temperature, and the temperature detecting element 3 and the variable resistor 4 are provided.
The signal from is input. Reference numeral 8 is an in-compartment temperature adjusting means for adjusting the in-compartment temperature on the basis of the detected in-compartment temperature and set temperature, and determines whether the compressor 9 is operating or stopped, and whether the temperature detecting element 3 is normal or abnormal. Reference numeral 10 is a compressor control means for controlling the drive of the compressor 9 based on the determination, 11 is an abnormality display control means for controlling the turning on and off of the display element 5, and these means detect an abnormality of the temperature detecting element 3. Means are configured. Reference numeral 12 is a microcomputer (hereinafter referred to as a microcomputer) that constitutes an electronic control circuit having analog input ports 12a and 12b, and is a variable resistor for setting the detection value of the temperature detecting element 3 set in the refrigerator and the temperature inside the refrigerator. The set value of 4 is read from the analog input ports 12a and 12b. Reference numerals 12 and 14 denote a positive terminal (+ Vcc) and a negative terminal (GND) of a power supply that supplies a DC voltage to the microcomputer 12 and the like.
Reference numeral 15 denotes a voltage dividing resistor connected in series with the temperature detecting element 3 between the temperature detecting element 3 and the power supply terminal 13,
Is determined, and a signal of this voltage level is input to the microcomputer 12 from the analog input port 12a. Reference numeral 16 denotes a voltage dividing resistor that is connected in series with the variable resistor 4 between the variable resistor 4 and the power supply terminal 13 and determines the voltage level applied to the variable resistor 4, and the signal of this voltage level is the analog input port 12b. Is input to the microcomputer 12. One of the elements 5 is a display element such as a light emitting diode connected to the output port 12c of the microcomputer 12 through the current limiting resistor 17, and the other is connected to the power supply terminal 14. A relay drive circuit 18 is connected to the output port 12d of the microcomputer 12, and the drive circuit 18 excites the relay 19. Then, when the relay 19 is excited as in the conventional case, the contact 20 is closed and the electric power from the AC power supply 21 is supplied to the compressor 9 to drive the compressor 9.
When the relay 19 is de-energized, the contact 20 is open,
The compressor 9 is stopped.

Next, the operation of the control device for the refrigerator having the above configuration will be described with reference to the flow charts of FIGS. FIG. 7 is a schematic flowchart showing the entire control program stored in the microcomputer 12. First, after initial setting in step 100, the main routine thereafter is entered. That is, in step 200, the microcomputer 12 reads the voltage signals input from the analog input ports 12a and 12b, converts each analog value into a digital value, and stores it. Figure 10 shows the digital value and temperature (° C)
It shows the correlation with. In this example, the voltage signals input from the analog input ports 12a and 12b are
The number is divided into 256 from "00" to "FF" in the base system, and the value at -40 ° C is set to "E0" and the value at + 40 ° C is set to "10". That is, the microcomputer 12 inputs the detection value of the temperature detecting element 3 in the range of -40 ° C to + 40 ° C to detect the temperature inside the refrigerator. Similarly, the set value (resistance value) of the variable resistor 4 is also input in the same range to detect the set temperature. At that time, since the temperature detecting element 3 is connected to the DC power source (+ Vcc) via the voltage dividing resistor 15, if the temperature inside the refrigerator changes and the detected value (resistance value) of the temperature detecting element 3 changes, The voltage signal applied to the analog input port 12a of the microcomputer 12 fluctuates, and the digital value read by the microcomputer 12 fluctuates as described above. With this, the microcomputer 12 can read the internal temperature. Similarly, since the variable resistor 4 is also connected to the DC power source (+ Vcc) via the voltage dividing resistor 16, the analog input port 12 of the microcomputer 12
The voltage signal applied to b changes and the set temperature in the refrigerator can be detected. Next, the process proceeds to step 300, and temperature input determination is performed. Here, as shown in the detailed flowchart of FIG. 8, the magnitudes of the digital value of the inside temperature and the digital value of the set temperature read by the microcomputer 12 are compared in step 301, and the inside temperature is higher than the set temperature. To determine. Then, if the internal temperature is higher, the compressor operation flag is set in step 302, and if the internal temperature is lower, the flag is reset in step 303. When the temperature input determination is completed, the output is set in step 400. That is, if the compressor operation flag is set, an excitation signal is output to the relay drive circuit 18 to excite the relay 19, which causes the contact 20 to close and the compressor 9 to be driven. Conversely, if the compressor operation flag is reset, a non-excitation signal is output to the relay drive circuit 18 to deactivate the relay 19, at which time the contact 20 is open and the compressor 9 is stopped. Although the temperature inside the refrigerator is controlled to be constant by the above-mentioned operation, the detected value (resistance value) of the temperature detecting element 3 varies depending on the temperature, but the value is -40 ° C or less (the digital value " E0 "or above) and +
When the temperature is 40 ° C or higher (digital value “10” or higher) (including when installing the refrigerator), it is usually unthinkable. That is, at this time, it is considered that the temperature detection element 3 is in an abnormal state due to destruction or connection failure. Therefore, in step 500, an abnormality determination of the temperature detecting element 3 is performed. FIG. 9 is a detailed flowchart thereof, and it is judged in step 501 whether the data (digital value) of the temperature inside the refrigerator is larger than “E0”.
Abnormal output is performed at 2. If the temperature data in the refrigerator is smaller than "E0", then it is judged in step 503 whether it is smaller than "10". Abnormality is displayed on the panel 6.

[0004]

Since the conventional control device for the refrigerator is constructed as described above, the temperature detecting element 3 is used.
However, there is a problem in terms of cost because it is necessary to separately provide a dedicated display element 5 in order to display that it is abnormal. In addition, there is a problem that the user may not notice in the actual use state even if the display device 5 displays an abnormality.

The present invention has been made in order to solve the above problems, and it is an object of the present invention to obtain a refrigerator control device capable of reliably notifying a user of an abnormality without separately providing an abnormality display element. To aim.

[0006]

A control device for a refrigerator according to the present invention is provided in a refrigerator, and a temperature detecting element for detecting the temperature inside the refrigerator, and a control of the inside temperature by the temperature detected by the temperature detecting element. A control circuit for performing, a door opening detection means for detecting that the door is opened, an inside lighting lamp provided in the inside for illuminating the inside of the compartment, and the door opening detection means when detecting the door opening, If the detected temperature of the temperature detecting element is out of a predetermined temperature range, an abnormality display means for displaying an abnormality by the internal lighting lamp is provided.

[0007]

When the temperature detecting element for detecting the temperature inside the refrigerator is abnormal, the refrigerator control device according to the present invention informs the abnormality by the illumination lamp in the refrigerator, so that the temperature can be reliably detected without providing new parts. It can warn of the abnormality of the element.

[0008]

【Example】

Example 1. An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a block diagram showing the overall configuration of a refrigerator control apparatus according to an embodiment of the present invention. In the figure, the same reference numerals as those of the conventional technique indicate the same or corresponding portions, and the detailed description of the same portions of the control circuit of FIG. 2 as those of the conventional FIG. 6 is omitted. Reference numeral 22 is a door switch which is installed so that it opens when the door of the refrigerator 1 opens and conversely when the door closes, it is connected between the power supply terminal 13 and the input port 12e of the microcomputer 12. There is. A relay drive circuit 23 is connected to the output port 12c of the microcomputer 12, and the relay 24 is excited by the drive circuit 23. Then, when the relay 24 is excited, the contact 25 is closed and electric power is supplied from the AC power source 21 to the refrigerator illumination lamps (hereinafter, abbreviated as interior lamps) 26 and 27, and the interior lamps 26 and 27 are turned on. Reference numeral 11 is an abnormality display control means for controlling lighting and extinguishing of the interior lights 26 and 27, and 28 is the door switch 22.
It is a door opening detection means for detecting opening / closing of the door.

Next, the operation will be described with reference to the flow chart of FIG. 3. FIG. 3 is a flow chart following the conventional flow chart of FIG. 7. In step 551, it is determined whether the door is open. Interior lights 26, 2
Turn off 7 If it is determined in step 551 that the door is open, it is determined in step 553 whether the internal temperature data (digital value) is larger than "E0". .. On the contrary, if the internal temperature data is not larger than [E0], then it is judged in step 554 whether it is smaller than “10”. If not smaller than step 55
At 5, the interior lights 26 and 27 are turned on. That is, the operation of lighting, extinguishing, and blinking the interior lights 26 and 27 will be described in detail with reference to FIG. When the temperature detecting element 3 is normal and the doors are open, the interior lights 26 and 27 are on, and when the doors are closed, the interior lights 26 and 2 are on.
7 is turned off. When the temperature detecting element 3 is abnormal and the door is closed, the interior lights 26 and 27 are turned off as in the normal state, but when the door is opened, the interior lights are turned on / off at 1 second intervals ( Blinking).

Embodiment 2. In the above embodiment, the method for displaying the abnormality of the temperature detecting element 3 is blinking for turning on / off at intervals of 1 second, but the present invention is not limited to this, and it is possible to turn on / off so that the user can definitely notice a failure. It may be set to the OFF time.

In the above embodiment, the abnormality of the temperature detecting element 3 is indicated only by the interior lights 26 and 27. However, the abnormality indication such as the display element 5 for abnormality indication shown in the conventional example is displayed. The configuration may be used in combination, and although the configuration is not inexpensive, it is possible to obtain a configuration that can surely notify the user of an abnormality.

Embodiment 3. Next, a third embodiment will be described with reference to the flowchart of FIG. FIG. 5 is a flowchart following FIG. 8 of the related art, and it is determined in step 101 whether the temperature inside the refrigerator is -5 ° C. or higher.
It is determined whether the HF flag is 1 or not. If it is 0, the timer starts counting and the HF flag is set to 1 in step 103. If the HF flag is 1 in step 102, the timer counts up in step 104.
Determine if the time has been reached. And when the timer reaches 1 hour in step 104, it is NG in step 105.
Set the F flag to 1. If it is determined in step 101 that the internal temperature is lower than −5 ° C., the HF flag is set to 0 in step 106, the NGF is set to 0 in step 107, and the timer is reset. In step 108, it is determined whether or not the door is open, and when it is closed (when NO), the interior lights 26 and 27 are turned off in step 109. When the door is opened in step 108 (YES), it is determined in step 110 whether the NGF flag is 1, and if it is 0, the interior lights 26 and 27 are turned on in step 111. In step 110, N
When the GF flag is 1, in step 112, the interior light 26, 2
Make 7 blink. Details of the operation of turning on, blinking, and turning off the interior lights 26, 27 will be described with reference to FIG. When the compressor is normal and the door is open, the inside lights 26 and 27 are turned on, and when the door is closed, the inside lights 26 and 27 are turned off. When the compressor is abnormal (NF
When the door is closed with G flag 1), the interior lights 26 and 27 are turned off, but when the door is opened, the interior lights are turned on / of at 1 second intervals.
F (flashes).

Embodiment 4. Further, in the above embodiment, the compressor 9
The above shows that the internal light is used to indicate the abnormalities of the refrigerator. It is also possible to adopt a configuration in which abnormalities of various components and the like that are configured are displayed by an interior lamp, and the same effect as that of the above-described embodiment is achieved.

[0014]

As described above, according to the present invention, there is provided a temperature detecting element for detecting the temperature inside the refrigerator, and a control for controlling the inside temperature by the temperature detected by the temperature detecting element. A circuit, a door opening detecting means for detecting that the door is opened, an inside lighting lamp provided in the inside of the compartment to illuminate the inside of the compartment, and the temperature detection when the door opening detecting means detects the door opening. When the detected temperature of the element is out of the predetermined temperature range, since the configuration is provided with an abnormality display means for displaying an abnormality by the internal lighting lamp, if the temperature detection element for detecting the internal temperature is abnormal Since the abnormality is notified by the internal lighting lamp, it is possible to reliably warn the abnormality of the temperature detecting element without providing new parts.

[Brief description of drawings]

FIG. 1 is an overall configuration block diagram of a refrigerator control device according to a first embodiment of the present invention.

FIG. 2 is a circuit configuration diagram of the refrigerator according to the first embodiment of the present invention.

FIG. 3 is a flow chart diagram of a control program of the control device for the refrigerator according to the first embodiment of the present invention.

FIG. 4 is a diagram showing an abnormality display pattern of the control device for the refrigerator according to the first embodiment of the present invention.

FIG. 5 is a flow chart diagram of a control program of a control device for a refrigerator according to a third embodiment of the present invention.

FIG. 6 is an overall configuration block diagram of a conventional refrigerator control device.

FIG. 7 is a circuit configuration diagram of a conventional refrigerator control device.

FIG. 8 is a flowchart of a control program of a conventional refrigerator control device.

FIG. 9 is a flowchart of a temperature input determination process of a conventional refrigerator control device.

FIG. 10 is a flowchart of an abnormality determination process of a conventional refrigerator control device.

FIG. 11 is a graph showing a correlation between a digital value and a temperature of a temperature detecting element of a conventional refrigerator control device.

[Explanation of symbols]

 3 Temperature Detection Element 10 Control Means 11 Abnormality Display Control Means 26 Internal Lighting Lamp 27 Internal Lighting Lamp 28 Door Opening Detection Means

Claims (1)

[Claims] 1. A temperature detection element, which is provided in the refrigerator and detects the temperature inside the refrigerator, a control circuit which controls the temperature inside the refrigerator by the temperature detected by the temperature detection element, and detects that the door is opened. When the door opening detection means, the inside lighting lamp provided in the inside of the compartment and illuminating the inside of the compartment, and the door opening detection means detects the door opening, the temperature detected by the temperature detecting element is out of the predetermined temperature range. If so, a control device for a refrigerator including an abnormality display means for displaying an abnormality by the internal lighting lamp.