Refrigerator fresh food compartment thermostat control method, controller and refrigerator

Abstract

This invention provides a method, controller, and refrigerator for constant temperature control of the refrigerator compartment, belonging to the field of refrigerator refrigeration control technology. The method includes: when the refrigerator compartment is refrigerating, determining whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is less than a first preset value; if so, controlling the electronic expansion valve to reduce its opening and activating the freezing branch and the freezing fan; detecting the freezer compartment temperature; determining whether the freezer compartment temperature is greater than the freezer compartment shutdown temperature; if so, determining whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is between 0 and a second preset value; when the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is not between 0 and the second preset value, controlling the opening of the electronic expansion valve according to the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature. The constant temperature control method for the refrigerator compartment of this invention can ensure a constant temperature in the refrigerator compartment during refrigerator refrigeration.

Description

Technical Field

[0001] This invention relates to the field of refrigerator refrigeration control technology, and in particular to a method, controller and refrigerator for constant temperature control of the refrigerator compartment. Background Technology

[0002] Capillary tubes act as throttling and pressure-reducing agents, preparing the refrigerator for evaporation. However, they cannot actively regulate refrigerant flow; the flow rate primarily changes with compressor speed and is also affected by ambient temperature and the refrigerator's heat load. Electronic expansion valves can change the refrigerator's passive flow regulation method, actively adjusting the refrigerant flow. As living standards improve, people's requirements for food storage are becoming increasingly refined. Some foods and items require particularly high refrigeration temperatures, which ordinary refrigerators cannot meet due to large temperature fluctuations in the refrigerator compartment.

[0003] Electronic expansion valves are widely used in air conditioners due to their fast refrigerant control, high precision, wide adjustment range, and outstanding energy-saving and cooling effects. Currently, with improvements in the flow control accuracy and structural design of electronic expansion valves, and through proper matching of the valve's flow opening with the compressor speed, it is becoming increasingly feasible for electronic expansion valves to replace capillary tubes in refrigerators. Therefore, refrigeration circuits using electronic expansion valves as throttling elements have emerged in existing technologies.

[0004] For refrigerator refrigeration systems equipped with electronic expansion valves and capillary tubes, how to maintain a constant temperature in the refrigerator compartment during the refrigeration process to meet market demands for constant-temperature refrigerators is an urgent problem to be solved. Summary of the Invention

[0005] One objective of the first aspect of this invention is to provide a method for constant temperature control of the refrigerator compartment, which can ensure a constant temperature in the refrigerator compartment during refrigeration.

[0006] A further objective of this invention is to further ensure the stability of the refrigerator compartment temperature throughout the entire refrigeration cycle.

[0007] A second aspect of the present invention is to provide a controller for implementing the above-described method for constant temperature control of a cold storage compartment.

[0008] A third aspect of the present invention is to provide a refrigerator including the controller described above.

[0009] Specifically, the present invention provides a method for constant temperature control of the refrigerator compartment, wherein the refrigeration circuit of the refrigerator includes a compressor, a condenser, a solenoid valve, an evaporator branch, and a return pipe connected in series. The evaporator branch includes a freezing branch and a refrigeration branch connected in parallel. The freezing branch includes a capillary tube and a freezing evaporator connected in series, and the refrigeration branch includes a heat exchange tube, an electronic expansion valve, and a refrigeration evaporator connected in series. The heat exchange tube exchanges heat with the return pipe. The solenoid valve is located at the upstream parallel end of the freezing branch and the refrigeration branch, and is used to control the on / off state of the freezing branch and the refrigeration branch. The refrigerator also includes a refrigeration fan and a freezing fan, respectively used to blow the cold air from the refrigeration evaporator into the refrigerator compartment and the cold air from the freezing evaporator into the freezer compartment. The method is characterized by comprising:

[0010] When the refrigerator compartment is refrigerating, determine whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is less than a first preset value;

[0011] If so, control the electronic expansion valve to reduce its opening and activate the refrigeration branch and the refrigeration fan;

[0012] Detect the temperature of the freezer compartment;

[0013] Determine whether the temperature of the freezer compartment is greater than the freezer compartment shutdown temperature;

[0014] If so, determine whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is between 0 and a second preset value;

[0015] When the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is not between 0 and a second preset value, the opening degree of the electronic expansion valve is controlled according to the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature.

[0016] Optionally, the step of controlling the opening degree of the electronic expansion valve based on the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature includes:

[0017] When the difference between the temperature of the refrigerator compartment and the temperature at which the refrigerator compartment is turned off is less than 0, the opening of the electronic expansion valve is reduced.

[0018] Optionally, the step of controlling the opening degree of the electronic expansion valve based on the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature includes:

[0019] When the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is greater than or equal to the second preset value, the opening degree of the electronic expansion valve is increased.

[0020] Optionally, after the step of controlling the opening degree of the electronic expansion valve according to the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature, the following steps are included:

[0021] Determine whether the freezer compartment temperature is less than or equal to the freezer compartment shutdown temperature;

[0022] If so, control the compressor to stop;

[0023] If not, continue cooling and return to the step of determining whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is between 0 and the second preset value.

[0024] Optionally, after determining whether the freezer compartment temperature is greater than the freezer compartment shutdown temperature, the following steps are included:

[0025] When the temperature of the freezer compartment is less than or equal to the freezer compartment shutdown temperature, the compressor is shut down.

[0026] Optionally, before determining whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is less than a first preset value during refrigeration in the refrigerator compartment, the following steps are included:

[0027] Detect the temperature of the refrigerator compartment;

[0028] When the temperature in the refrigerator compartment is higher than the refrigerator compartment start-up temperature, the refrigerator branch and the refrigerator fan are activated to enable the refrigerator compartment to cool.

[0029] Optionally, activating the refrigeration branch and the refrigeration fan includes:

[0030] Start the compressor, control the solenoid valve to connect the refrigeration branch, start the electronic expansion valve and the refrigeration fan.

[0031] Optionally, the step of activating the refrigeration branch and the refrigeration fan includes:

[0032] The solenoid valve is controlled to simultaneously connect the refrigeration branch and the freezing branch, and to start the refrigeration fan.

[0033] In particular, the present invention also provides a controller, including a memory and a processor, wherein the memory stores a control program, which, when executed by the processor, is used to implement the constant temperature control method for a refrigerator compartment according to any of the preceding claims.

[0034] In particular, the present invention also provides a refrigerator including the controller described above.

[0035] According to one embodiment of the present invention, when the temperature of the refrigerator compartment gradually decreases to near the refrigerator compartment shutdown temperature, the freezer compartment is also controlled to cool simultaneously. At this time, the opening of the electronic expansion valve on the refrigerator branch is reduced, which basically does not affect the freezing of the heated plastic. The refrigerator compartment is in a micro-cooling device, and the cooling capacity is just enough to keep the refrigerator compartment temperature from rising, that is, to suppress the refrigerator compartment temperature from rising. Therefore, the temperature fluctuation of the refrigerator compartment can be reduced. The refrigerator compartment is kept running while the freezer compartment is cooling. Then, during the freezer compartment cooling stage, the refrigerator compartment temperature is maintained within a certain range by controlling the opening of the electronic expansion valve, thereby achieving constant temperature control of the refrigerator compartment.

[0036] According to one embodiment of the present invention, the opening of the electronic expansion valve is increased or decreased accordingly based on the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature, thereby maintaining the refrigerator compartment temperature within a suitable range and preventing it from becoming too cold or too hot.

[0037] According to one embodiment of the present invention, after adjusting the opening of the electronic expansion valve, the relationship between the freezer temperature and the freezer shutdown temperature is determined again. If the freezer temperature is greater than the freezer shutdown temperature, refrigeration continues, and the process returns to the step of determining whether the difference between the refrigerator temperature and the refrigerator shutdown temperature is between 0 and a second preset value. The refrigeration cycle ends when the freezer temperature is less than or equal to the freezer shutdown temperature, thus further ensuring the stability of the refrigerator temperature throughout the entire refrigeration cycle.

[0038] The above and other objects, advantages and features of the present invention will become more apparent to those skilled in the art from the following detailed description of specific embodiments of the invention in conjunction with the accompanying drawings. Attached Figure Description

[0039] The following sections will describe some specific embodiments of the invention in detail by way of example and not limitation, with reference to the accompanying drawings. The same reference numerals in the drawings denote the same or similar parts or portions. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the drawings:

[0040] Figure 1 This is a schematic diagram of the connection of a refrigeration system corresponding to a constant temperature control method for a refrigerator compartment according to an embodiment of the present invention;

[0041] Figure 2 This is a flowchart of a method for controlling the constant temperature of a refrigerator compartment according to an embodiment of the present invention;

[0042] Figure 3 This is a flowchart of a method for controlling the constant temperature of a refrigerator compartment according to another embodiment of the present invention;

[0043] Figure 4 This is a connection block diagram of a controller according to an embodiment of the present invention;

[0044] Figure 5This is a schematic diagram of the structure of a refrigerator according to an embodiment of the present invention. Detailed Implementation

[0045] In the description of this embodiment, it should be understood that the term "back" indicates the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present invention and simplifying the description, and is not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention.

[0046] In the description of this embodiment, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0047] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature, that is, include one or more of that feature. When a feature "includes or contains" one or more of the features it encompasses, unless otherwise specifically stated, this indicates that other features are not excluded and may be further included.

[0048] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," "fixing," and "coupling," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art should be able to understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0049] Furthermore, in the description of this embodiment, "above" or "below" the second feature can include direct contact between the first and second features, or it can include contact between the first and second features through another feature between them. That is, in the description of this embodiment, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," or "below" of the second feature can mean the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0050] Unless otherwise specified, all terms (including technical and scientific terms) used in the description of this embodiment have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0051] Figure 1 This is a connection diagram of a refrigeration system corresponding to a constant temperature control method for a refrigerator compartment according to an embodiment of the present invention. Figure 1 As shown, Figure 1 A refrigeration system corresponding to a refrigerator compartment constant temperature control method in this embodiment is provided. The refrigerator's refrigeration circuit includes a compressor 10, a condenser 20, a solenoid valve 30, an evaporator branch, and a return pipe 60 connected in series. The evaporator branch includes a freezing branch and a refrigeration branch connected in parallel. The freezing branch includes a capillary tube 41 and a freezing evaporator 42 connected in series, and the refrigeration branch includes a heat exchange tube 51, an electronic expansion valve 52, and a refrigeration evaporator 53 connected in series. The heat exchange tube 51 exchanges heat with the return pipe 60; for example, the heat exchange tube 51 and the return pipe 60 are attached together to facilitate heat exchange. The refrigeration branch effectively separates the throttling function and the heat exchange function; that is, the electronic expansion valve 52 is responsible for throttling, and the heat exchange tube 51 is responsible for heat exchange with the return pipe 60. The freezer and refrigerator cooling circuits can be turned on individually or simultaneously. The freezer evaporator 42 of the freezer circuit can be located in the freezer compartment, and the refrigerator evaporator 53 of the refrigerator circuit can be located in the refrigerator compartment, cooling the freezer and refrigerator compartments respectively. The electronic expansion valve 52 can be fixed behind the air duct and connected to the finned refrigerator evaporator 53. The solenoid valve 30 is located at the upstream parallel end of the freezer and refrigerator circuits to control the on / off state of the freezer and refrigerator circuits. The refrigerator also includes a refrigerator fan and a freezer fan, which are used to blow the cold air from the refrigerator evaporator 53 into the refrigerator compartment and the cold air from the freezer evaporator 42 into the freezer compartment, respectively.

[0052] Figure 2 This is a flowchart of a method for maintaining a constant temperature in a refrigerator compartment according to an embodiment of the present invention. Figure 2 As shown, in one embodiment, the method for controlling the temperature of the refrigerator compartment includes:

[0053] In step S100, when the refrigerator compartment is refrigerating, determine whether the difference between the refrigerator compartment temperature Tc and the refrigerator compartment shutdown temperature Tcg is less than a first preset value T1. If so, proceed to step S200. Here, the first preset value T1 can be 1℃ or 2℃.

[0054] In step S200, the electronic expansion valve 52 is controlled to reduce its opening, and the refrigeration branch and refrigeration fan are activated.

[0055] In one embodiment, the opening of the electronic expansion valve 52 can be reduced to a first set opening, for example, 30%-50%, which can be 30%, 40%, or 50%. The steps of activating the refrigeration branch and the refrigeration fan include: controlling the solenoid valve 30 to simultaneously connect the refrigeration branch and the refrigeration branch, and starting the refrigeration fan.

[0056] Step S300: Detect the freezer compartment temperature Td.

[0057] Step S400: Determine whether the freezer temperature Td is greater than the freezer shutdown temperature Tdg; if so, proceed to step S500.

[0058] Step S500: Determine whether the difference between the refrigerator compartment temperature Tc and the refrigerator compartment shutdown temperature Tcg is between 0 and the second preset value T2; if not, proceed to step S600.

[0059] Step S600: Control the opening degree of the electronic expansion valve 52 according to the relationship between the refrigerator compartment temperature Tc and the refrigerator compartment shutdown temperature Tcg.

[0060] In this embodiment, when the refrigerator compartment temperature Tc gradually decreases to near the refrigerator compartment shutdown temperature Tcg, the freezer compartment is also controlled to cool simultaneously. At this time, the opening of the electronic expansion valve 52 on the refrigerator branch is reduced, which basically does not affect the freezing of the heated plastic. The refrigerator compartment is in a micro-cooling device, and the cooling capacity is just enough to keep the refrigerator compartment temperature Tc from rising, that is, to suppress the refrigerator compartment temperature Tc from rising. Therefore, it can reduce the fluctuation of the refrigerator compartment temperature Tc. The refrigerator compartment is kept running while the freezer compartment is cooling. Then, during the freezer compartment cooling stage, the opening of the electronic expansion valve 52 is controlled to maintain the refrigerator compartment temperature Tc within a certain range, thereby achieving constant temperature control of the refrigerator compartment.

[0061] Figure 3 This is a flowchart of a method for maintaining a constant temperature in a refrigerator compartment according to another embodiment of the present invention. In one embodiment, such as Figure 3 As shown, step S600 includes:

[0062] Step S610: Determine whether the difference between the refrigerator compartment temperature Tc and the refrigerator compartment shutdown temperature Tcg is less than 0. If yes, proceed to step S620; otherwise, proceed to step S630 (that is, proceed to step S630 when the difference between the refrigerator compartment temperature Tc and the refrigerator compartment shutdown temperature Tcg is greater than the second preset value T2).

[0063] In step S620, reduce the opening of the electronic expansion valve 52. For example, reduce it by 15%-25%, which can be 15%, 20%, or 25%.

[0064] Step S630: Increase the opening of the electronic expansion valve 52. For example, increase it by 15%-25%, which can be 15%, 20%, or 25%.

[0065] When the difference between the refrigerator compartment temperature Tc and the refrigerator compartment shutdown temperature Tcg is less than 0, it indicates that the opening of the electronic expansion valve 52 is too large, which will cause the refrigerator compartment temperature Tc to be too low. In this case, reducing the opening of the electronic expansion valve 52 can prevent the refrigerator compartment temperature Tc from being too low. When the difference between the refrigerator compartment temperature Tc and the refrigerator compartment shutdown temperature Tcg is greater than the second preset value T2, it indicates that the opening of the electronic expansion valve 52 is too small. Insufficient cooling capacity will cause the refrigerator compartment temperature Tc to rise too quickly, and the opening of the electronic expansion valve 52 needs to be increased.

[0066] In this embodiment, the opening of the electronic expansion valve 52 is increased or decreased accordingly based on the difference between the refrigerator compartment temperature Tc and the refrigerator compartment shutdown temperature Tcg, so as to keep the refrigerator compartment temperature Tc within a suitable range and prevent it from being too cold or too hot.

[0067] like Figure 3 As shown, in a further embodiment, step S600 is followed by:

[0068] In step S700, determine whether the freezer temperature Td is less than or equal to the freezer shutdown temperature Tdg. If yes, proceed to step S800; otherwise, continue cooling and return to the step of determining whether the difference between the refrigerator temperature Tc and the refrigerator shutdown temperature Tcg is between 0 and the second preset value T2, that is, continue to keep the refrigerator branch and the freezer branch active and return to step S500.

[0069] In step S800, compressor 10 is stopped. This means the refrigeration cycle has ended.

[0070] In this embodiment, after adjusting the opening of the electronic expansion valve 52, the relationship between the freezer temperature Td and the freezer shutdown temperature Tdg is determined again. When the freezer temperature Td is greater than the freezer shutdown temperature Tdg, refrigeration continues, and the process returns to the step of determining whether the difference between the refrigerator temperature Tc and the refrigerator shutdown temperature Tcg is between 0 and the second preset value T2. The refrigeration cycle ends when the freezer temperature Td is less than or equal to the freezer shutdown temperature Tdg. Therefore, the stability of the refrigerator temperature Tc is further ensured throughout the entire refrigeration cycle.

[0071] In a further embodiment, such as Figure 3 As shown, after step S400, the following steps are also included:

[0072] When the freezer compartment temperature Td is less than or equal to the freezer compartment shutdown temperature Tdg, the compressor 10 is shut down, i.e., step S800 is entered, ending the refrigeration cycle.

[0073] like Figure 3 As shown, in a further embodiment, the method further includes the following steps before step S100:

[0074] Step S20: Detect the temperature Tc of the refrigerator compartment.

[0075] Step S40: Determine whether the refrigerator compartment temperature Tc is greater than the refrigerator compartment start-up temperature Tck. If yes, proceed to step S60; otherwise, return to step S20.

[0076] Step S60: Activate the refrigeration branch and refrigeration fan to cool the refrigeration compartment.

[0077] The steps for activating the refrigeration branch and the refrigeration fan include: starting the compressor 10, controlling the solenoid valve 30 to connect the refrigeration branch, and starting the electronic expansion valve 52 and the refrigeration fan.

[0078] Figure 4 This is a connection block diagram of a controller 100 according to an embodiment of the present invention. Figure 4 As shown, the present invention also provides a controller 100, including a memory 120 and a processor 110. The memory 120 stores a control program 122, which, when executed by the processor 110, is used to implement the refrigerator compartment constant temperature control method in any of the above embodiments or combinations thereof. The processor 110 may be a central processing unit (CPU), a digital processing unit, etc. The processor 110 sends and receives data through a communication interface. The memory 120 is used to store the program executed by the processor 110. The memory 120 can be any medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer, or it may be a combination of multiple memories 120. The above-described computational program can be downloaded from a computer-readable storage medium to a corresponding computing / processing device or downloaded to a computer or external storage device via a network (e.g., the Internet, a local area network, a wide area network, and / or a wireless network).

[0079] In this embodiment, the controller 100 can control the freezer compartment to cool simultaneously when the refrigerator compartment temperature Tc gradually decreases to near the refrigerator compartment shutdown temperature Tcg. At this time, reducing the opening of the electronic expansion valve 52 on the refrigerator branch will have virtually no impact on the freezing of the heated plastic. The refrigerator compartment is in a micro-cooling state, and the cooling capacity is just enough to keep the refrigerator compartment temperature Tc from rising, that is, to suppress the refrigerator compartment temperature Tc from rising. Therefore, it can reduce the fluctuation of the refrigerator compartment temperature Tc. The refrigerator compartment is kept running while the freezer compartment is cooling. Then, during the freezer compartment cooling stage, the refrigerator compartment temperature Tc is maintained within a certain range by controlling the opening of the electronic expansion valve 52, thereby achieving constant temperature control of the refrigerator compartment.

[0080] Figure 5 This is a schematic diagram of the structure of a refrigerator 200 according to an embodiment of the present invention. Figure 5 As shown, the present invention also provides a refrigerator 200, including the controller 100 in the above embodiments.

[0081] Therefore, those skilled in the art should recognize that although numerous exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications conforming to the principles of the present invention can be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the invention. Thus, the scope of the present invention should be understood and construed as covering all such other variations or modifications.

Claims

1. A method for constant temperature control of the refrigerator compartment, wherein the refrigerator's refrigeration circuit includes a compressor, a condenser, a solenoid valve, an evaporator branch, and a return pipe connected in series; the evaporator branch includes a freezing branch and a refrigeration branch connected in parallel; the freezing branch includes a capillary tube and a freezing evaporator connected in series; the refrigeration branch includes a heat exchange tube, an electronic expansion valve, and a refrigeration evaporator connected in series; the heat exchange tube exchanges heat with the return pipe; the solenoid valve is located at the upstream parallel end of the freezing branch and the refrigeration branch, and is used to control the on / off state of the freezing branch and the refrigeration branch; the refrigerator further includes a refrigeration fan and a freezing fan, respectively used to blow the cold air from the refrigeration evaporator into the refrigerator compartment and the cold air from the freezing evaporator into the freezer compartment, characterized in that... The method includes: When the refrigerator compartment is refrigerating, determine whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is less than a first preset value; If so, control the electronic expansion valve to reduce its opening and activate the refrigeration branch and the refrigeration fan; Detect the temperature of the freezer compartment; Determine whether the temperature of the freezer compartment is greater than the freezer compartment shutdown temperature; If so, determine whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is between 0 and a second preset value; When the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is not between 0 and a second preset value, the opening degree of the electronic expansion valve is controlled according to the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature.

2. The method for constant temperature control of a cold storage compartment according to claim 1, characterized in that, The steps for controlling the opening degree of the electronic expansion valve based on the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature include: When the difference between the temperature of the refrigerator compartment and the temperature at which the refrigerator compartment is turned off is less than 0, the opening of the electronic expansion valve is reduced.

3. The method for constant temperature control of a cold storage compartment according to claim 1, characterized in that, The steps for controlling the opening degree of the electronic expansion valve based on the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature include: When the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is greater than or equal to the second preset value, the opening degree of the electronic expansion valve is increased.

4. The method for constant temperature control of a cold storage compartment according to any one of claims 1-3, characterized in that, Following the step of controlling the opening degree of the electronic expansion valve based on the relationship between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature, the following steps are included: Determine whether the freezer compartment temperature is less than or equal to the freezer compartment shutdown temperature; If so, control the compressor to stop; If not, continue cooling and return to the step of determining whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is between 0 and the second preset value.

5. The method for constant temperature control of a cold storage compartment according to claim 4, characterized in that, After determining whether the freezer compartment temperature is greater than the freezer compartment shutdown temperature, the following steps are included: When the temperature of the freezer compartment is less than or equal to the freezer compartment shutdown temperature, the compressor is shut down.

6. The method for constant temperature control of a cold storage compartment according to claim 5, characterized in that, Before determining whether the difference between the refrigerator compartment temperature and the refrigerator compartment shutdown temperature is less than a first preset value during refrigeration in the refrigerator compartment, the following steps are included: Detect the temperature of the refrigerator compartment; When the temperature in the refrigerator compartment is higher than the refrigerator compartment start-up temperature, the refrigerator branch and the refrigerator fan are activated to enable the refrigerator compartment to cool.

7. The method for constant temperature control of a cold storage compartment according to claim 6, characterized in that, The steps for activating the refrigeration branch and the refrigeration fan include: Start the compressor, control the solenoid valve to connect the refrigeration branch, start the electronic expansion valve and the refrigeration fan.

8. The method for constant temperature control of a cold storage compartment according to claim 1, characterized in that, The steps for activating the refrigeration branch and the refrigeration fan include: The solenoid valve is controlled to simultaneously connect the refrigeration branch and the freezing branch, and to start the refrigeration fan.

9. A controller comprising a memory and a processor, the memory storing a control program, the control program being executed by the processor to implement the constant temperature control method for a refrigerator compartment according to any one of claims 1-8.

10. A refrigerator, characterized in that, Includes the controller described in claim 9.

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