KR920000349B1 - Temperature control method for refrigerator - Google Patents

Abstract

The system block of refrigerator comprises setting section (2) and temperature detecting section (3) for the inside temperature of the refrigerator, a motor damper (8) for the output signals in accordance with opening and closing state of the damper driving signals, micom (1) for the control signals to drive damper (8). The method for controlling the inside temperature of the refrigerator includes the first step for comparing temperature setting data with temperature detecting data at the inside of refrigerator, the second step for searching damper state by the feed-back signals. The motor damper (8) with a motor (6) is operated by electric power of switch section (5) accepting damper driving signals through amplifying section (4).

Description

Refrigeration temperature control method

1 is a system block diagram for practicing the present invention.

2 is a cross-sectional view of a fan cooled refrigerator.

3 is a flow chart according to the present invention.

* Explanation of symbols for the main parts of the drawings

1: microcomputer 2: temperature setting unit

3: temperature sensing unit 4: amplifying unit

5 switch 6 motor

7: Reed switch 8: Motor damper

The present invention relates to a method for controlling the internal temperature of a refrigerator, and more particularly, to a method for controlling the internal temperature of a refrigerator using a motor damper.

In the conventional method of controlling the temperature of an electronic refrigerator, a solenoid damper is used as a means for opening and closing a flow passage of cold air, and thus, a temperature inside the refrigerator has been removed so that the temperature between the set temperature and the detection temperature inside the refrigerator can be substantially matched. .

As described above, the method for controlling the internal temperature of the high temperature by using the solenoid damper is a method of driving the damper by generating an electromagnetic force in the solenoid according to the comparison between the user's set temperature and the detected temperature in the high temperature.

Conventional refrigerator temperature control method using the above-mentioned solenoid damper is to obtain the momentary operation by the electromagnetic force, the opening and closing operation of the damper may fail, even if the opening and closing state of the damper can be confirmed the method of opening and closing the damper. There was no.

In addition, severe noise is generated during the opening and closing operation of the damper by the electromagnetic force of the solenoid, which becomes a problem of noise and durability.

Accordingly, an object of the present invention is to provide a method for controlling a high internal temperature using a motor damper.

Still another object of the present invention is to provide a temperature control method for accurately controlling the internal temperature of the motor damper as an open / close feedback signal.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a system diagram for implementing the present invention. The built-in program compares the set temperature with the high internal sensing temperature and outputs a damper drive control signal according to the result of the setting of the microcomputer 1 and the user. A temperature setting unit 2 for inputting the set temperature data by the microcomputer 1 to the microcomputer 1, a temperature setting unit 2 for detecting a high internal temperature and inputting the set temperature data to the microcomputer 1 as the sensed temperature data; An amplifier 4 for driving the damper drive control signal of (1) to a signal of a predetermined level, a switch unit 5 for switching a predetermined voltage by a signal of the amplifier 4, and outputting the signal; A lead switch driven in one direction by the output voltage of the unit 5 and interlocked and switched by opening and closing of a damper (not shown) by a damper by driving of the motor 6. Consists of a motor damper (8) consisting of (7) It is.

FIG. 2 is a flow chart of a cooling fan of a fan-cooled refrigerator, in which 11 is a freezer compartment, 12 is a vaporizer, which generates cold air, 13 is a refrigerator compartment, 14 is a compressor, 15 is a duct, 16 is a fan, and 17 is a It is a damper.

3 is a flowchart according to the present invention, which compares the temperature setting data with the high temperature detection data and searches whether the damper should be driven, and outputs a motor damper driving signal when driving the damper in the first step. A second step of searching for whether the damper is in an open or closed state by the feedback signal; and in the second step, the state of the current damper is closed in a closed state at a time; A fourth step of searching for a damper close driving command state by outputting a motor driving signal of the second step when the search result of the third step is different from the third step of searching for a relationship between A fifth step of stopping the damper drive signal when the damper is closed in the fourth step and performing the damper drive of the second step when the damper close signal is not driven; When the state is in the open state, the state is saved in a predetermined area, and the sixth step of searching for a relationship with the state before the present state is output, and when the search result of the sixth step is the same, the motor driving signal of the second step is outputted. A seventh step of retrieving the damper hot sound driving command state by performing signal switching when different, and an eighth step of resuming the second step when the damper driving signal is stopped when the search result in the seventh step is a damper hot sound command; Is made of.

Hereinafter, the operation example according to the present invention will be described with reference to FIGS. 1 to 3, in which the damper reed switch 7 of FIG. 1 has a predetermined first level (VCC) when the damper is fully opened or is completely closed until immediately before complete closure. Will be explained on the assumption that the predetermined second level GND is output to the feedback signal line F from the time of complete closure and until just before complete opening.

When the power supply voltage is supplied to each of the circuits constructed as shown in FIG. 1 now, the temperature setting section 2 outputs the set temperature data set by the user to the line A, and the temperature sensing section 3 ) Detects the temperature in the interior chamber 13 of the interior and outputs the detected temperature data on the line B.

In addition, the microcomputer 1 compares the temperature setting data and the temperature sensing data inputted to the lines A and B after initialization and searches whether the damper should be driven in the process of FIG. 3 (3a).

At this time, if the difference between the temperature setting data and the temperature sensing data is more than a predetermined value, for example, the temperature setting data is 5 ° C. and the temperature sensing data is 7 ° C., it is determined that the motor damper should be driven in step (3a). In other words, it must be driven open. The microcomputer 1 that determines that the motor damper should be driven in step (3a) outputs a damper driving signal through the line (C) in step (3b) and saves an open command to the internal memory.

On the other hand, the damper driving signal input to the line C is amplified by the amplifier 4 to a sufficient level and then driven to the switch unit 5 through the line D. The switch unit 5 which inputs the damper driving signal amplified by the amplifying unit 4 is switched in response to the damper driving signal to convert a predetermined voltage (motor driving voltage) input to the line 10 into the line E. Through the motor 6 in the motor damper (8) through. Therefore, the motor 6 starts to rotate in one direction by the input of the driving voltage.

On the other hand, the microcomputer (1) outputting the damper drive signal in the process (3b) inputs the feedback signal of the reed switch 7 input to the line (F) to search whether the damper switch 7 is open or closed state. .

The signal fed back to the line F becomes a predetermined first level (Vcc: 5V) or predetermined second level (GND: OV) signal according to opening and closing of the reed switch 7, and the reed switch 7 It is switched by the opening (opening) and closing (closing) of the damper 17 shown in 2 degrees. In this case, as described above, the reed switch 7 outputs a signal of a predetermined first level Vcc until the damper 17 of FIG. 2 is completely open or completely closed, and the damper 17 is completely closed. The switch outputs a predetermined second level GND voltage from closed or fully closed to fully open. If the output of the reed switch 7 outputting the feedback signal in the above state is a predetermined second level, the microcomputer 1 determines that the damper 17 is closed in step 3c, and the internal memory in step 3d. Record the closing signal at. That is, data indicating that the damper 17 is currently closed is marked in the internal memory.

In step 3d, the microcomputer 1, which records the closing signal currently fed back, searches whether the previous state feedback signal of the reed switch 7 is open in step 3e. If the previous signal is determined to be open in step (3e), the microcomputer 1 searches for a signal change indication in which the damper 17 is switched from open to open in step (3f). If the signal change indication is not indicated in the above step (3f), the state flag which is switched from the closed to the open state is set in the internal memory, and the above-described step (3b) is performed again to continue driving the motor 6.

The motor 6 is thus driven by the path as described above, thereby opening the damper 17 of FIG. 2. The microcomputer 1 performing the process (3b) again searches for the state of the reed switch 7 in the process (3c). In this case, the reed switch 7 outputs the feedback signal in the closed state to the line F because the damper 17 is driven from the closed state to the open state by the damper motor 6.

Therefore, the microcomputer 1 continuously determines the current feedback signal as the closed state in step (3c), and records the closed state in step (3d). The microcomputer 1 performing the process (3d) performs the processes (3e) and (3f) as described above, and if it is determined that the signal is switched in the search of the process (3f), the damper is closed in the process (3h). Search for the presence of a command.

In the process described above, it is determined that the closing command is in the process (3h), and the output of the damper drive signal output to the line (C) is stopped in the process (3n) to stop the driving of the damper motor (6). If the previous signal was closed in the above-described process (3e), the damper is continuously driven by performing the process of (3b).

If the process of (3b) (3c) (3d) (3e) is repeatedly performed and the reed switch (7) is detected in the fully open state in the process (3c) by the drive of the motor 6, the microcomputer (1) In step (3i), the open state is recorded in the predetermined buffer area.

In the process (3i), the microcomputer 1 which records the open signal searches whether the previous signal has been opened in the process (3j). At this time, the microcomputer 1 judges that the previous state is closed by the recording of the above-described process (3d), searches whether the signal change indication is indicated in the process (3k), and if the signal change is indicated, the damper is opened in the process (3m). Search for the presence of a command.

Since the present state is the open command state, the microcomputer 1 determines that there is a hot sound command in step (3m), and stops the damper 17 driving signal in step (3n). Therefore, even if the damper 17 is half-opened by the initial driving or momentary power failure, the microcomputer 1 confirms the feedback signal that is changed from the closed state to the inverted state of the damper 17. do.

If the temperature setting data is 5 ° C. and the sensing temperature data is 3 ° C., the damper should be driven in the above-mentioned process (3a). The microcomputer 1 outputs the damper driving signal through the line C in the process of (3b) and internally. Save the damper close command to the memory area.

At this time, the damper driving signal is input to the amplifying unit 4 and the switch unit 5 as described above, so that the damper motor 6 is rotated in one direction. On the other hand, the microcomputer (1) outputting the damper drive signal in step (3b) inputs the current feedback signal of the reed switch (7) input to the line (F) to search whether the damper switch (7) is open or closed. do.

If the search state of (3c) is in the open state, the state thereof is saved in a predetermined area in the process of (3i), and is the feedback signal before the state of the previous state of the reed switch 7 open in (3j)? Search for. If it is determined that the previous signal was closed in step (3j), it is searched whether or not the damper is displayed as a signal changeover switch from open to closed in step (3k).

If the signal change indication is not indicated in step (3k), the microcomputer (1) sets the state flag to be switched from open to closed in step (31), and repeats the above-described step (3b).

The damper motor 6 is thus driven by the path as described above, thereby closing the damper 17 of FIG. 2 which is open. The microcomputer 1 performing the process (3b) re-searches the state of the reed switch 7 in the process (3c). At this time, the reed switch 7 is a state in which the damper is driven from the open state to the closed state by the drive of the damper motor 6, and thus outputs the feedback signal of the open state on the line F.

Therefore, the microcomputer 1 continuously determines the current feedback signal in the open state in the process (3c), and the microcomputer 1 in the process (3c) determines that the damper 17 is opened in the process (3i). Feeded open signal recording is performed.

The microcomputer 1 performing the process (3i) performs (3j) and (3k) as described above, and if it is determined that the signal is switched in the search of the process (3k), the microcomputer 1 (3m) Check if there is a damper open command in the process.

If it is determined that the open command during the process described above is in the process (3m), the output of the damper drive signal output to the line (C) in the process (3n) is stopped to stop the driving of the damper motor (6).

If the previous signal was closed in step (3j) described above, the damper is continuously driven by performing the step (3b).

If the reed switch 7 is closed in the process (3c) by the damper motor 6, the process of (3b) (3c) (3i) (3j) is repeatedly performed, the microcomputer (1) In the process (3d), the closing signal input to the line F is recorded in the closed state in the predetermined buffer area.

In the process of the microcomputer 3e in which the closing signal was recorded in step 3d, it is searched whether the previous signal was opened. At this time, the microcomputer 1 judges that the previous state is opened by the recording of the above-described process (3i), searches whether the signal change indication is indicated in the process (3f), and if the signal change is indicated, the damper closes in the process (3h). Search for the presence of a command.

In the process (3h), the microcomputer 1 stops the driving of the damper 17 in the process (3n) because the current state is a closed command state. Therefore, when the damper is half-opened by the initial driving or the momentary power failure, the closing operation is completed after the microcomputer 1 confirms the inverting state of the damper. Therefore, the damper is accurately controlled by the feedback signal in the open / closed state of the damper and the open / close command of the damper.

As described above, the present invention can accurately control the motor damper with low noise by the open / close feedback signal and the open / close command of the damper, read the feedback signal, check the inversion state of the feedback signal, and control the damper drive to open and close the damper. In this case, precise control can be performed, and thus, there is an advantage that high temperature control can be precisely performed.

Claims (1)

A temperature setting unit 2 for setting a temperature in the refrigerator, a temperature sensing unit 3 for sensing a temperature in the refrigerator, and a motor damper 8 that is opened and closed by input of a damper driving signal and outputs a state signal according to the open / closed state. And the output of the temperature setting unit 2 and the temperature sensing unit 3 so that the detected temperature of the temperature sensing unit 3 becomes the set temperature of the temperature setting unit 2. A temperature control method of a fan-cooled refrigerator having a microcomputer (1) for outputting a low damper driving signal, comprising: a first step of searching whether a damper should be driven by comparing temperature setting data with high temperature detection data; Outputting the motor damper driving signal when driving the damper in the first step, and searching for whether the damper is in an open or closed state by the feedback signal; and in the second step, the current damper is closed in a closed state. Its state is recorded in the predetermined area. A third step of searching for the relationship with the previous state of the present state and the step of outputting the motor drive signal of the second step when the search result of the third step is different and performing signal switching when the damper close drive command state is the same In the fourth step of searching for, the fifth step of performing the damper drive of the second step when the damper drive signal is stopped when the damper closed drive state in the fourth step, and in the search process of the second step When the current damper is in the open state, the state is saved in a predetermined area, and the sixth step of searching for a relationship with the state before the current state and the second step when the search result of the sixth step are the same A seventh step of searching for a damper hot driving state by outputting a signal and performing a signal change when it is different, and resuming the second step when the damper driving signal is stopped when the search result in the seventh step is a damper hot command; Temperature control method of a refrigerator, characterized by made of an eighth step of.

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