A temperature control system for a refrigerator

Abstract

The application provides a temperature control system of a refrigerator, wherein a temperature sensor is arranged in the refrigerator, the temperature sensor is electrically connected with a main control board, and the main control board is electrically connected with a compressor, so that the temperature fluctuation is reduced by controlling the action of the compressor. When powered on for the first time, the compressor works at a high temperature control frequency, so that the temperature can quickly reach the upper limit of the temperature setting; then the compressor works at a low temperature control frequency, and enters a small-amplitude adjustment mode; according to the storage capacity, size and external temperature of the refrigerator, the frequency at which the refrigerator needs the compressor to work is variable; the device determines the working efficiency of the compressor by using the start-stop mode, so as to reduce the temperature fluctuation and prolong the preservation period of food materials. In addition, various processing mechanisms are set according to personnel setting or various emergency situations, so as to ensure that the temperature of the refrigerator can quickly recover to be stable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of refrigeration equipment, in particular to a temperature control system of a refrigerator. BACKGROUND

[0002] In the existing refrigerator, the compressor stops when the temperature reaches the set temperature during the refrigeration process. Due to the strong hysteresis of the traditional temperature control system, the temperature in the refrigerator continues to decrease for a period of time before it starts to rise. When the temperature reaches the start point, the compressor starts. This temperature control method will cause large temperature fluctuations in the refrigerator, long cooling time, and repeated freezing and thawing of food in the refrigerator during the temperature fluctuation period, resulting in nutrient loss. SUMMARY

[0003] The technical problem solved by the present application is to provide a temperature control system of a refrigerator to reduce temperature fluctuations by controlling the operation of the compressor and solve the problems raised in the background.

[0004] The technical problem solved by the present application is solved by the following technical solution: a temperature control system of a refrigerator, the refrigerator is provided with a temperature sensor, the temperature sensor is electrically connected with a main control board, and the main control board is electrically connected with a compressor to reduce temperature fluctuations by controlling the operation of the compressor. The temperature control method comprises:

[0005] The temperature sensor detects the temperature in the refrigerator and transmits the temperature data to the main control board. The main control board transmits the data to the MCU for operation processing through a temperature input conversion circuit. The MCU determines whether the refrigerator is powered on for the first time.

[0006] If it is the first time to power on, the compressor operates at a set high temperature control frequency until the temperature T in the refrigerator reaches the upper limit Tt of the temperature setting. The compressor frequency is reduced to the set low temperature control frequency and enters the start-stop mode. At this time, there are two states:

[0007] The first state: if the temperature T continues to decrease to the lower limit Tx of the temperature setting, the compressor stops. When the next time the compressor starts, the compressor frequency operates at A-10Hz, where A is the frequency of the last time the compressor starts. The cycle is repeated. If the temperature rises to the warning temperature Tk the next time the compressor starts, the last compressor frequency is executed.

[0008] The second state: if the temperature T rises above the warning temperature Tk, the compressor frequency operates at B-10Hz, where B is the last frequency of the compressor (B is the high temperature control frequency for the first time). Until the temperature T continues to decrease to the lower limit Tx of the temperature setting, the compressor stops. When the next time the compressor starts, the compressor frequency operates at B-10Hz again. The cycle is repeated. If the temperature rises to the warning temperature Tk the next time the compressor starts, the last compressor frequency is executed.

[0009] As a further scheme of the present application:

[0010] If the compressor frequency is reduced to CHz, the temperature T in the refrigerator can be reduced to the upper limit of the temperature setting Tt, and the compressor frequency is operated at C-10Hz, the temperature T in the refrigerator cannot be reduced to the upper limit of the temperature setting Tt, CHz is set as the low frequency of the compressor temperature control, and the compressor is started to operate at CHz frequency;

[0011] As a further scheme of the present application:

[0012] If the compressor frequency is operated at DHz, the temperature T in the refrigerator is continuously greater than the upper limit of the temperature setting Tt, and the compressor is operated at D+10Hz frequency for temperature control;

[0013] As a further scheme of the present application:

[0014] During the operation of the refrigerator, if the following conditions occur, the compressor immediately operates in the initial power-on mode:

[0015] a. T≥Tsx+5°, Tsx is the set alarm temperature;

[0016] b. The start-up time is greater than or equal to 20 minutes;

[0017] c. In the start-stop mode, when the compressor frequency enters the high frequency of the temperature control, the start-up time exceeds 15 minutes (4 times cumulative average).

[0018] As a further scheme of the present application:

[0019] During the operation of the refrigerator, if T≥Tsx, the compressor frequency is operated at the over-limit frequency, the compressor frequency is increased to the operating frequency E+50Hz, and the operation is performed until T= Tk, the compressor frequency will be operated at the previous frequency E, and the E+50Hz frequency is not involved in the frequency conversion determination;

[0020] As a further scheme of the present application:

[0021] In the start-stop mode, the single start-up time of the compressor is 5 minutes as the reference control time:

[0022] a. When the start-up time is greater than 5 minutes, the frequency is increased by 10Hz per time, until the start-up time is less than 5 minutes or the compressor frequency reaches the high frequency of the temperature control;

[0023] b. When the start-up time is less than or equal to 5 minutes, the frequency is reduced by 10Hz per time, until the start-up time is greater than or equal to 5 minutes or the compressor frequency reaches the low frequency of the temperature control;

[0024] c. When the compressor frequency is below the high frequency of the temperature control, and the start-up time exceeds 15 minutes, the initial power-on mode is immediately switched;

[0025] As a further scheme of the present application:

[0026] If the personnel change the set temperature:

[0027] a. The set temperature is increased, and the following steps are repeated: when T≤Tt, the compressor frequency is reduced to the low temperature control frequency; Tt≤T≤Tk, the compressor frequency is reduced by 10 Hz; T≤Tx, the compressor is stopped, and the next time the compressor is started, the compressor frequency is reduced by 10 Hz;

[0028] b. The set temperature is reduced, and the operation is performed according to the initial power-on mode.

[0029] Compared with the prior art, the beneficial effects of the present application are: when the initial power is turned on, the compressor works at the high temperature control frequency, so that the temperature can quickly reach the upper limit of the temperature setting, and then the compressor works at the low temperature control frequency, enters the small amplitude adjustment mode, and according to the storage capacity, size and external temperature of the refrigerator, the frequency of the compressor required by the refrigerator is changed. The device uses the start-stop mode to determine the working efficiency of the compressor, thereby reducing temperature fluctuations and prolonging the preservation period of food. And various processing mechanisms are set for personnel setting or various sudden situations, so as to ensure that the temperature of the refrigerator can quickly recover to stable. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 The control flowchart of the present application. DETAILED DESCRIPTION

[0031] In order to make the implementation technical means, creative features, purposes and effects of the present application easy to understand, the present application will be further described below in combination with specific drawings.

[0032] As shown in Figure 1 ,

[0033] The embodiment provides a temperature control system of a refrigerator, the refrigerator is provided with a temperature sensor, the temperature sensor is electrically connected with a main control board, and the main control board is electrically connected with a compressor, so as to reduce temperature fluctuations by controlling the action of the compressor. The temperature control method comprises the following steps:

[0034] The temperature sensor detects the temperature in the refrigerator and transmits the temperature data to the main control board, the main control board transmits the data to an MCU operation processing through a temperature input quantity conversion circuit, and the MCU judges whether the refrigerator is initially powered on;

[0035] If the initial power is turned on, the compressor works at the set high temperature control frequency until the temperature T in the refrigerator reaches the upper limit Tt of the temperature setting, the compressor frequency is reduced to the set low temperature control frequency, and enters the start-stop mode, at this time, two states will appear:

[0036] The first state: if the temperature T continues to decrease to the temperature setting lower limit Tx, the compressor stops, and the next time the compressor is started, the compressor frequency is operated at A-10 Hz, A is the frequency of the last time the compressor is started, and the cycle is repeated; if the next time the compressor is started, the temperature rises to the warning temperature Tk, the last time the compressor frequency is executed;

[0037] The second state: if the temperature T rises above the warning temperature Tk, the compressor frequency is operated at B-10 Hz, B is the last time the compressor frequency is used (the first B is the high frequency of temperature control), until the temperature T continues to decrease to the temperature setting lower limit Tx, the compressor stops, and the next time the compressor is started, the compressor frequency is operated at B-10 Hz again, and the cycle is repeated; if the next time the compressor is started, the temperature rises to the warning temperature Tk, the last time the compressor frequency is executed.

[0038] In this embodiment, when the refrigerator is running, if the compressor frequency decreases to CHz, the temperature T in the refrigerator can still decrease to the temperature setting upper limit Tt, the compressor frequency is operated at C-10 Hz, and the temperature T in the refrigerator cannot decrease to the temperature setting upper limit Tt, CHz is set as the low frequency of temperature control of the compressor, and the compressor is started to operate at CHz frequency thereafter;

[0039] If the compressor frequency is operated at DHz, the temperature T in the refrigerator continues to be greater than the temperature setting upper limit Tt, the compressor is operated at D+10 Hz frequency for temperature control;

[0040] In this embodiment, during the running of the refrigerator, if the following conditions occur, the compressor immediately operates according to the initial power-on mode:

[0041] a. T≥Tsx+5°, Tsx is the set warning temperature;

[0042] b. The start-up time is greater than or equal to 20 min;

[0043] c. In the start-stop mode, when the compressor frequency enters the high frequency of temperature control, the start-up time is greater than 15 min (4 times cumulative average).

[0044] During the running of the refrigerator, if T≥Tsx, the compressor frequency is operated according to the over-limit frequency, the compressor frequency rises to E+50 Hz, and the operation is performed until T= Tk, the compressor frequency will be operated according to the previous frequency E, and the E+50 Hz frequency does not participate in the frequency conversion determination;

[0045] In this embodiment, in the start-stop mode, the single start-up time of the compressor is 5 min as the reference control time:

[0046] a. When the start-up time is greater than 5 min, the frequency is increased by 10 Hz each time until the start-up time is less than 5 min or the compressor frequency reaches the high frequency of temperature control;

[0047] b. When the start-up time is less than or equal to 5 minutes, reduce the frequency by 10 Hz per time until the start-up time is greater than or equal to 5 minutes or the compressor frequency reaches the low frequency of temperature control;

[0048] c. When the compressor frequency is lower than the high frequency of temperature control and the start-up time is greater than 15 minutes, immediately switch to the initial power-on mode;

[0049] In this embodiment, if the user changes the set temperature:

[0050] a. When the set temperature is increased, repeat the following steps: when T is less than or equal to Tt, reduce the compressor frequency to the low frequency of temperature control; when Tt is less than or equal to T and T is less than or equal to Tk, reduce the compressor frequency by 10 Hz; and when T is less than or equal to Tx, stop the compressor and reduce the compressor frequency by 10 Hz when the compressor is started next time;

[0051] b. When the set temperature is decreased, operate according to the initial power-on mode.

[0052] The above shows and describes the basic principles and main features of the present application and the advantages of the present application. Those skilled in the art should understand that the present application is not limited by the above embodiments, and the above embodiments and descriptions in the specification are only to illustrate the principles of the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of the claimed present application is defined by the appended claims and their equivalents. It should be noted that in this document, relationship terms such as first and second are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device that includes a series of elements includes not only those elements, but also other elements not explicitly listed or inherent to such process, method, article or device. Without further limitation, the element defined by the phrase "including a" does not exclude the presence of additional identical elements in the process, method, article or device that includes the element.

Claims

1. A temperature control system of a refrigerator, the refrigerator is provided with a temperature sensor, the temperature sensor is electrically connected with a main control board, the main control board is electrically connected with a compressor, characterized in that: To reduce temperature fluctuation by controlling compressor operation, the temperature control method comprises: The temperature sensor detects the temperature inside the refrigerator and transmits the temperature data to the main control board, which transmits the data to the MCU for operation processing through the temperature input conversion circuit. The MCU determines whether the refrigerator is powered on for the first time; If it is the first power-on, the compressor works at the set temperature control high frequency until the temperature T inside the refrigerator reaches the temperature setting upper limit Tt, the compressor frequency is reduced to the set temperature control low frequency, and enters the start-stop mode, at this time there are two states: The first state: if the temperature T continues to drop to the temperature setting lower limit Tx, the compressor stops, and the next time the compressor frequency runs at A-10Hz, A is the frequency of the last start of the compressor, and the cycle is repeated; If the temperature rises to the warning temperature Tk the next time the machine is started, the last compressor frequency is executed; The second state: if the temperature T rises more than the warning temperature Tk, the compressor frequency runs at B-10Hz, B is the last frequency of the compressor used, the first B is the temperature control high frequency, until the temperature T continues to drop to the temperature setting lower limit Tx, the compressor stops, and the next time the compressor frequency runs at B-10Hz, and the cycle is repeated; If the temperature rises to the warning temperature Tk the next time the machine is started, the last compressor frequency is executed.

2. The temperature control system of a refrigerator according to claim 1, characterized in that: When the refrigerator is running, if the compressor frequency is reduced to CHz, the temperature T inside the refrigerator can still be reduced to the temperature setting upper limit Tt, the compressor frequency works at C-10Hz, and the temperature T inside the refrigerator cannot be reduced to the temperature setting upper limit Tt, then CHz is set as the temperature control low frequency of the compressor, and the compressor is started at CHz frequency.

3. The temperature control system of claim 2, wherein: If the compressor frequency runs at DHz, the temperature T inside the refrigerator is continuously greater than the temperature setting upper limit Tt, then the compressor frequency is D+10Hz for frequency control.

4. The temperature control system of claim 1, wherein: During the operation of the refrigerator, if the following conditions occur, the compressor immediately runs in the first power-on mode: a. T ≥ Tsx + 5°, Tsx is the set alarm temperature; b. The start-up time is ≥ 20 min; c. In the start-stop mode, when the compressor frequency enters the temperature control high frequency, the start-up time exceeds 15 min.

5. The temperature control system of a refrigerator according to claim 4, characterized in that: During the operation of the refrigerator, if T ≥ Tsx, run according to the over-limit frequency, the compressor frequency rises to the operating frequency E+50Hz, and runs until T=Tk, the compressor frequency will run according to the previous frequency E, and the E+50Hz frequency does not participate in the frequency conversion judgment.

6. The temperature control system of a refrigerator according to claim 1, wherein: In the start-stop mode, the single start of the compressor is 5 min as the reference control time: a. When the start-up time is greater than 5 min, increase the frequency by 10Hz / time, until the start-up time is less than 5 min or the compressor frequency reaches the temperature control high frequency; b. When the start-up time is ≤ 5 min, decrease the frequency by 10Hz / time, until the start-up time is ≥ 5 min or the compressor frequency reaches the temperature control low frequency; c. When the compressor frequency is below the temperature control high frequency, the start-up time exceeds 15 min, immediately switch to the first power-on mode.

7. The temperature control system of a refrigerator according to claim 1, wherein: If the personnel changes the set temperature: a. Set temperature rise, repeat the following steps: when T≤Tt, the compressor frequency is reduced to the low frequency of temperature control; Tt≤T≤Tk, the compressor frequency is reduced by 10 Hz; T≤Tx, the compressor stops, and the next time the compressor frequency is reduced by 10 Hz when starting; b. Set temperature drop, run according to the initial power-on mode.

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