JPH03260576A - refrigerator control device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a control device for an electronically controlled refrigerator.
In particular, it relates to the detection of anomalies.

[Conventional technology]

FIG. 8 is a block diagram showing the overall configuration of a conventional refrigerator control device disclosed in, for example, Japanese Utility Model Application Publication No. 62-32980. In FIG. A temperature detection element (3) such as
An operation panel (6) having a variable resistor (4) for setting the internal temperature and a display element (5) for indicating an abnormality is provided on the door surface. (7) is a temperature detection means for detecting the internal temperature and the set temperature, into which signals from the temperature detection element (3) and the variable resistor (4) are input. (8) is an internal temperature adjustment means that adjusts the internal temperature based on the detected internal temperature and the set temperature, and controls the operation and stop of the compressor (9), and the temperature detection element (3).
) to determine whether it is normal or abnormal. (10) is a compressor control means for controlling the drive of the compressor (9) based on the determination.

(11) is abnormality display control means for controlling lighting and extinguishing of the display element (5), and these means constitute abnormality detection means (12) of the temperature detection element (3).

FIG. 9 is a circuit configuration diagram showing the main parts of the control device.

In the figure, (13) is a control circuit constituting the control device.

(14) is an analog input port (14a), (14
b) A microcomputer constituting the control circuit (13) having
The detected value of the temperature detection element (3) installed inside the refrigerator and the setting value of the variable resistor (4) for setting the temperature inside the refrigerator are read from the analog input ports (14a) and (14b). (15) and (16) are the positive terminal (+Vcc) and negative terminal (GND) of the power supply that supplies DC voltage to the microcomputer (14), etc.
), (17) are the temperature detection element (3) and the power supply terminal (15)
A voltage dividing resistor connected in series with the temperature detection element (3) determines the voltage level applied to the temperature detection element (3), and a signal of this voltage level is sent to the analog input port (14a).
) is input to the microcomputer (14). (18) is connected between the variable resistor (4) and the power supply terminal (15).
4) is a voltage dividing resistor connected in series with the variable resistor (4).
The voltage level to be applied to the microcomputer (14) is determined, and a signal of this voltage level is input to the microcomputer (14) from the analog input port (14b). (5) is the display element such as a light emitting diode, which is connected to the output port (14C) of the microcomputer (14) via the current limiting resistor (19) on one side, and the other side is connected to the power supply terminal (16). There is. In addition, the microcomputer (14
) has a relay drive circuit (20) on the output boat (14d).
is connected, and the relay (21) is excited by this drive circuit (20). When the relay (21) is energized, the contact (22) closes and power is supplied from the AC power supply (23) to the compressor (9), thereby driving the compressor (9). Contact (22) when relay (21) is de-energized
is open and the compressor (9) is stopped.

Next, the operation of the refrigerator control device having the above configuration will be explained with reference to the flowcharts shown in FIGS. 10 to 12.

FIG. 10 is a schematic flowchart showing the entire control program stored in the microcomputer (14). First, after initial setting in step (100), the subsequent main routine begins. That is, in step (200), the microcomputer (14) connects the analog input port (14a), '
The voltage signal input from (14b) is read and each analog value is converted into a digital value and stored. FIG. 13 shows the correlation between the digital value and temperature ('C). In this example, the analog input port (14a)
, The voltage signal input from (14b) is divided into 256 hexadecimal numbers from "00" to rFFJ, and the value at -40°C is r
The value of EOJ and +40°C is set to be "10". In other words, the microcomputer (14) is the temperature detection element (3)
Input the detected value in the range from -40℃ to +40℃,
Detects the temperature inside the refrigerator. Similarly, the set value (resistance value) of the variable resistor (4) is input within the same range, and the set temperature is detected.

At this time, the temperature detection element (3) is connected to the DC power supply (+Vcc) via the voltage dividing resistor (17).

If the temperature inside the refrigerator fluctuates and the detected value (resistance value) of the temperature detection element (3) changes, the voltage signal applied to the analog input port (14a) of the microcomputer (14) will fluctuate, and as described above, the voltage signal applied to the analog input port (14a) of the microcomputer (14) will change. 14) The digital value read in changes. The microcomputer (14) can now read the temperature inside the refrigerator. Similarly, the variable resistor (4) is also a voltage dividing resistor (
18) to the DC power supply (+Vcc), so the analog input port (14b) of the microcontroller (■4)
) The set temperature inside the refrigerator can be detected by changing the voltage signal applied to the refrigerator.

Next, the process moves to step (300) and a temperature input determination is performed. Here, as shown in the detailed flowchart of FIG. 11, the digital value of the internal temperature read into the microcomputer (14) and the digital value of the set temperature are compared in step (301), and the internal temperature is calculated. Determine whether the temperature is higher than the set temperature. and.

If the temperature inside the refrigerator is higher, a compressor operation flag is set in step (302), and if the temperature inside the refrigerator is lower, the flag is reset in step (303).

After completing the temperature input determination, 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 (20) to excite the relay (21), thereby causing the contact (22
) is closed and the compressor (9) is driven. Conversely, if the compressor operation flag has been reset, the relay drive circuit (20
) to de-energize the relay (21), and at this time the contact (22) is open and the compressor (9) is stopped.

The temperature inside the refrigerator is controlled to be kept constant by the above-mentioned operation, but the detection value (resistance value) of the temperature detection element (3) fluctuates depending on the temperature, but if the value is 40℃ or less (digital (value rEOJ or higher) and +40°C or higher (digital value "10" or lower) (including when installing a refrigerator), it is usually not detected. In other words, at this time, the temperature detection element (
3) is thought to be broken or have a poor connection, resulting in an abnormal state.

Therefore, in step (500), abnormality determination of the temperature detection element (3) is performed. FIG. 12 is a detailed flowchart, in which it is determined in step (501) whether the data (digital value) of the internal temperature is greater than rEOJ, and if so, an abnormality is output in step (502). If the data on the internal temperature is smaller than "EO", it is determined in step (503) whether it is smaller than "10", and if it is smaller, an abnormality output is performed in the same way, and at the same time the display element (5)
A signal is sent to

An error message is displayed on the display operation panel (6).

In this manner, an abnormality in the temperature detection element (3) can be detected and the abnormality is displayed on the display operation panel (6), which is useful during inspections, etc.

[Problem to be solved by the invention]

Since the conventional refrigerator control device is configured as described above, the abnormality display can be effectively used during servicing.

Even if the system becomes abnormal, it may return to normal, and there is a possibility that the check at the time of service may be incomplete. In addition, when a part of the control circuit breaks down, the entire control board (not shown) that makes up the control circuit is often replaced in order to speed up repairs, but the replaced board is later investigated. However, there were problems such as the nature of the failure was not clear, repair was difficult, and effective improvements could not be made.

This invention was made in order to solve the above-mentioned problems. 1. It is possible to clarify the details of the failure and perform checks at the time of service more accurately and smoothly. To provide a control device for a refrigerator that allows the user to know the details of the failure even when checking it later.

[Means to solve the problem]

The refrigerator control device according to the present invention is provided with an abnormality storage means that stores the abnormality contents from the abnormality detection means and the like and retains the stored contents even if the supplied power is stopped.

[Effect]

In the refrigerator according to the present invention, the abnormal contents that have occurred even once are stored and retained by the abnormality storage means even if the power supply is stopped.
Be sure to notify the contents of the abnormality.

〔Example〕

An embodiment of the present invention will be described below with reference to the drawings. 1st
FIG. 2 is a block diagram showing the overall configuration of a refrigerator control device according to an embodiment of the present invention, and FIG. 2 is a circuit configuration diagram showing main parts of the control device shown in FIG. 1.

In the figures, the same reference numerals as in the prior art indicate the same or corresponding parts, and detailed explanation thereof will be omitted.

(24) is an abnormality storage means, and the above-mentioned abnormality detection means (12)
The device stores the data of the abnormality detected by the temperature detection element (3), continues to store the abnormality data that has occurred even if the temperature detection element (3) returns to normal, and stops the power supply. It also retains memory data,
When a request is made, the abnormality data stored in the abnormality display control means (11) is outputted to control lighting and extinguishing of the display element (5) to display the contents of the abnormality.

(25) is a memory circuit constituting this abnormality memory means (24), which has a built-in nonvolatile memory element, and has a built-in nonvolatile memory element.
4) is connected to the input/output board (14e), and the microcontroller (
14), only writing and reading of abnormal data is controlled. (26) is a readout switch connected between the input port (145) of the microcomputer (14) and the power supply terminal (15), which causes the microcomputer (14) to read the abnormal data in the memory circuit (25). . (27) is a display element such as a light emitting diode that displays the elapsed time since the occurrence of an abnormality, and is an output capacitor of the microcomputer (14).
14g) to the display element (5) in parallel.

A current limiting resistor (28) is also provided in series.

Next, the operation of the refrigerator control device having the above configuration will be explained with reference to the flowcharts shown in FIGS. 3 to 7. Third
The figure is a schematic flowchart showing the entire control program, and the flow from start to output setting in step (400) is the same as that of the conventional technology, and detailed explanation will be omitted.

Next, the abnormality determination processing routine of step (500),
The timer processing routine of step (600) and the storage data input routine of step 7' (700) will be explained using detailed flowcharts of FIGS. 5 to 7.

First, as shown in Fig. 5, in the abnormality determination routine in step (500), the internal temperature data is determined in steps (501) and (503) as in the conventional case, and in the case of an abnormality, an abnormality is output in step (502). Do the following. At the same time, a step (
504), the data is transmitted and stored in the storage circuit (25).

Next, in the timer processing routine of step (600) shown in FIG. 6, if there is an abnormal output in step (601), the timer output is output every certain period (in this embodiment, every hour) in step (602). ) and stored in the storage circuit (25) together with the abnormal data.

Next, FIG. 7 shows a stored data input routine in step (700). When the read switch (26) is pressed in step (701), first step (702) is executed.
In step (703), the data stored in the storage circuit (25) is read, and in step (703) the data contents are output to the display elements (5) and (27). At this time, the output of the abnormal data is distinguished from the lighting of the abnormal mode display during normal operation by setting the display element (5) in a blinking mode, for example.

In addition, the display element (27) displays the elapsed time since the abnormal data was input.
．． One display element (27) by blinking at 5-second intervals, blinking at 1-second intervals within one week from the second day, blinking at 2-second intervals from one week to one month, and lighting for one month or more.
You can easily display the elapsed time.

Even if a failure occurs, such as a poor contact in the connector part (not shown) or a poor contact inside the temperature detection element (3), which causes it to become defective or return to normal, the abnormal data that occurred will be saved. Let me retain my memory.

By displaying the information, more accurate checks can be made in the market, and the memory circuit (25
) has been deleted.

According to this embodiment, since the elapsed time from the occurrence of the abnormality is stored and displayed, the details of the abnormality such as poor contact can be understood more clearly, and the effect is that the repair person is encouraged to speed up the repair. Also plays.

Furthermore, in the above embodiment, the display element (5) for displaying an abnormality was provided exclusively, but it may also be provided for other purposes as well.
For example, a display element (not shown) that normally displays a temperature setting display may be configured to display abnormal data or the elapsed time from the occurrence of an abnormality when an abnormality occurs.

In addition, in the above embodiment, the - degree abnormality of the temperature detection element (3) is stored and displayed as 1, but the present invention is not limited to this, and the variable resistor (4) and the control circuit It is possible to store and display various abnormalities such as the abnormality in (13) 9 and many times. For example, if the control board (not shown) constituting the control circuit (13) is configured to be able to store the details of the abnormality in the control circuit (13), the entire control board will be deleted in the event of a failure in the control circuit (13). After replacing and repairing quickly, from the replaced control board alone,
The stored abnormality data can be read out and the contents of the abnormality can be easily understood, and useful information can be obtained when making improvements.

〔Effect of the invention〕

As described above, according to the present invention, an abnormality storage means is provided which stores the abnormality contents from the abnormality detection means and retains the stored contents even when the supplied power is stopped.
- Since it is possible to know even abnormalities that occur from time to time, and the cause of the failure can be determined with certainty, repairs can be carried out smoothly and serviceability can be improved.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing the overall configuration of a refrigerator control device according to an embodiment of the present invention, FIG. 2 is a circuit configuration diagram showing main parts of the control device shown in FIG. 1, and FIG. A schematic flowchart showing the control operation of the microcomputer. FIG. 4 is a detailed flowchart showing the temperature input judgment operation shown in FIG. 3. FIG. 5 is a detailed flowchart showing the abnormality judgment operation shown in FIG. Detailed flowchart showing the operation,
FIG. 7 is a detailed flowchart showing the storage data input operation of FIG. 3, FIG. 8 is a block diagram showing the overall configuration of a conventional refrigerator control device, and FIG. 9 shows the main parts of the control device of FIG. 10 is a schematic flowchart showing the control operation of the microcomputer in FIG. 9, FIG. 11 is a detailed flowchart showing the temperature input judgment operation in FIG. 10, and FIG. 12 is the abnormality judgment operation in FIG. 10. Detailed flowchart 1 showing
FIG. 3 is a correlation diagram showing the correlation between temperature and digital values. (1) is a refrigerator, (12) is an abnormality detection means, (24)
) is an abnormal storage means. In Figure 1, the same reference numerals indicate the same or equivalent parts.

Claims (1)

[Claims] In a refrigerator control device comprising a temperature detection element that detects the temperature inside the refrigerator, and an abnormality detection means that detects and notifies an abnormality when the detected value of the temperature detection element exceeds a predetermined range, the abnormality detection described above is provided. Memorizes abnormal contents from means etc.
A control device for a refrigerator, characterized in that it is provided with an abnormality storage means that retains the stored contents even if the supplied power is stopped.