Control method and device of refrigerating system, refrigerator and storage medium

Abstract

The invention provides a control method and device of a refrigerating system, a refrigerator and a computer readable storage medium. The refrigerating system comprises a compressor, a condenser, a valve and an evaporator. Wherein the compressor, the condenser, the valve and the evaporator are connected in sequence; the control method comprises the steps that the first real-time temperature of the evaporator is obtained; when the first real-time temperature is smaller than or equal to the stop point temperature, the compressor is controlled to stop, and the valve is controlled to be closed; when the valve is closed, the loop between the condenser and the evaporator is disconnected; acquiring a second real-time temperature of the evaporator; when the second real-time temperature is larger than the preset temperature, the stop duration of the compressor is obtained; wherein the preset temperature is smaller than the starting point temperature and larger than the stopping point temperature; if the stop duration is smaller than the shutdown protection duration, the valve is controlled to be opened and run for a preset duration; and when the valve is opened, the loop between the condenser and the evaporator is conducted.

Description

Technical Field

[0001] The present application relates to the technical field of refrigerators, and particularly relates to a control method, device, refrigerator and storage medium for a refrigeration system. Background Art

[0002] The refrigeration system is an important part of the refrigerator for cooling the compartments. During operation of the refrigeration system, the compressor stops running when the set shutdown condition is triggered and starts running when the set startup condition is triggered. However, in the traditional refrigeration system, after the compressor stops running, the refrigerant gradually flows from the high-pressure side to the low-pressure side, resulting in the need to re-establish the pressure difference when the compressor starts next time, increasing the energy consumption. Therefore, in the prior art, by setting a valve, after the refrigeration ends, the valve closes to prevent the refrigerant from flowing back from the high-pressure side (condenser) to the low-pressure side (evaporator), thereby maintaining the high-pressure state in the condenser. In this way, the compressor does not need to re-establish the pressure difference when starting next time, reducing the starting load and improving the energy efficiency.

[0003] However, in the prior art, after the compressor stops, the valve closes to prevent the refrigerant from flowing from the high-pressure condenser end to the low-pressure evaporator end, and the temperature rise rate of the evaporator accelerates, resulting in the compartment temperature reaching the startup point quickly. However, at this time, the compressor may still be within the shutdown protection time and cannot start immediately, resulting in inability to refrigerate. Summary of the Invention

[0004] The present application provides a control method, device, refrigerator and storage medium for a refrigeration system, aiming to solve the technical problem that the compressor cannot start when the evaporator temperature rises back to the startup point temperature in the prior art.

[0005] In a first aspect, the present application further proposes a control method for a refrigeration system, where the refrigeration system includes a compressor, a condenser, a valve and an evaporator; wherein, the compressor, the condenser, the valve and the evaporator are connected in sequence; the control method includes:

[0006] S100, obtaining the first real-time temperature of the evaporator;

[0007] S200, when the first real-time temperature is less than or equal to the shutdown point temperature, controlling the compressor to stop and controlling the valve to close; when the valve is closed, the circuit between the condenser and the evaporator is disconnected;

[0008] S300, obtaining the second real-time temperature of the evaporator;

[0009] S400, when the second real-time temperature is greater than a preset temperature, obtaining the stop duration of the compressor; wherein, the preset temperature is less than the startup point temperature and greater than the shutdown point temperature;

[0010] S500, if the duration of the stop is less than the shutdown protection duration, control the valve to open and operate for a preset duration; when the valve is open, the circuit between the condenser and the evaporator is conducted.

[0011] Optionally, the control method further includes:

[0012] S600, after the valve is open for the preset duration, control the valve to close, and execute step S300 and step S400.

[0013] Optionally, the control method further includes:

[0014] S700, when the duration of the stop reaches the shutdown protection duration, determine whether the second real-time temperature is greater than the startup point temperature;

[0015] S800, if so, control the compressor to open and control the valve to open until the first real-time temperature is less than or equal to the shutdown point temperature;

[0016] S900, if not, wait for the second real-time temperature to reach the startup point temperature.

[0017] Optionally, the preset temperature is 1-2 °C less than the startup point temperature.

[0018] Optionally, the control method further includes:

[0019] After the compressor stops and the valve closes, obtain the first pressure of the condenser and the second pressure of the evaporator;

[0020] Determine the preset duration according to the difference between the first pressure and the second pressure and the preset pressure difference-duration mapping relationship.

[0021] Optionally, the control method further includes:

[0022] After the compressor stops and the valve closes, obtain the ambient temperature;

[0023] Determine the temperature difference between the startup point temperature and the preset temperature according to the ambient temperature;

[0024] Determine the preset temperature according to the startup point temperature and the temperature difference;

[0025] Wherein, there is a positive correlation between the ambient temperature and the temperature difference.

[0026] Optionally, the control method further includes:

[0027] The "if the duration of the stop is less than the shutdown protection duration, control the valve to open and operate for a preset duration" includes:

[0028] Determine the time difference between the stopping duration and the shutdown protection duration;

[0029] Determine the preset duration according to the time difference; wherein, there is a positive correlation between the time difference and the preset duration.

[0030] An embodiment of the present application also proposes a control device for a refrigeration system. The refrigeration system includes a compressor, a condenser, a valve, and an evaporator; wherein, the compressor, the condenser, the valve, and the evaporator are connected in sequence; the control device includes:

[0031] An acquisition module configured to acquire the first real-time temperature of the evaporator;

[0032] A control module configured to control the compressor to stop and control the valve to close when the first real-time temperature is less than or equal to the shutdown point temperature; when the valve is closed, the circuit between the condenser and the evaporator is disconnected;

[0033] The acquisition module is configured to acquire the second real-time temperature of the evaporator;

[0034] The acquisition module is configured to acquire the stopping duration of the compressor when the second real-time temperature is greater than the preset temperature; wherein, the preset temperature is less than the startup point temperature and greater than the shutdown point temperature;

[0035] The acquisition module is configured to control the valve to open and operate for a preset duration if the stopping duration is less than the shutdown protection duration; when the valve is open, the circuit between the condenser and the evaporator is conducted.

[0036] In a third aspect, the present application also proposes a refrigerator, including a controller and a refrigeration system, and the controller is used to control the refrigeration system to execute the steps in the control method described above.

[0037] In a fourth aspect, the present application also proposes a computer-readable storage medium, on which a computer program is stored, and the computer program is loaded by a processor to execute the steps in the control method described above.

[0038] Technical advantages: In the technical solution of the embodiment of the present application, when the first real-time temperature of the evaporator is less than or equal to the shutdown point temperature, the compressor stops running, and at this time the valve also closes; that is, after the compressor shuts down, the refrigerant on the high-pressure side (condenser) cannot flow to the low-pressure side (evaporator), which is convenient for the compressor to start under a pressure difference next time to save energy consumption. After that, since there is no refrigerant supply to the evaporator, it starts to warm up, and then obtains the second real-time temperature; when the second real-time temperature is greater than the preset temperature, the stop duration of the compressor is obtained; if the stop duration is less than the shutdown protection duration, at this time, control the valve to open and run for a preset duration, and at this time the circuit between the condenser and the evaporator is conducted, so that a part of the refrigerant can flow to the evaporator, delaying the warming-up speed of the evaporator by reducing the temperature of the evaporator, so that when the temperature of the evaporator rises to the startup point temperature, the shutdown duration of the compressor has reached the shutdown protection duration and the compressor can start. Description of the Drawings

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0040] Figure 1 is a schematic structural diagram of the refrigeration system provided in the embodiment of the present application;

[0041] Figure 2 is a schematic flowchart of a control method of the refrigeration system provided in the embodiment of the present application;

[0042] Figure 3 is another schematic flowchart of a control method of the refrigeration system provided in the embodiment of the present application;

[0043] Figure 4 is yet another schematic flowchart of a control method of the refrigeration system provided in the embodiment of the present application;

[0044] Figure 5 is a schematic structural diagram of the control device of the refrigeration system provided in the embodiment of the present application. Detailed Embodiments

[0045] The following will clearly and completely describe the technical solutions in the embodiments of the present application with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative efforts belong to the scope of protection of the present invention.

[0046] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality of" means two or more, unless otherwise specifically defined.

[0047] In this application, the term "exemplary" is used to mean "serving as an example, illustration, or explanation". Any embodiment described as "exemplary" in this application is not necessarily to be construed as more preferred or advantageous than other embodiments. The following description is provided to enable any person skilled in the art to make and use the present invention. In the following description, details are set forth for the purpose of explanation. It should be understood that those of ordinary skill in the art can recognize that the present invention can be practiced without these specific details. In other instances, well-known structures and processes are not described in detail to avoid obscuring the description of the present invention with unnecessary details. Therefore, the present invention is not intended to be limited to the embodiments shown, but is to be accorded the widest scope consistent with the principles and features disclosed in this application.

[0048] The embodiments of the present application provide a control method, device, refrigerator, and storage medium for a refrigeration system, which will be described in detail below.

[0049] As Figure 1 shown, the refrigeration system includes a compressor 31, a condenser 32, a valve 33, and an evaporator 34. The compressor, condenser, valve, and evaporator are connected in sequence. The outlet of the evaporator communicates with the compressor. The valve has an open state and a closed state. A throttling device 35, such as a throttle valve or a capillary tube, is also provided between the condenser and the evaporator. In some embodiments, the evaporator may include only one or may include two. When applied to a refrigerator, the evaporator can be configured to directly supply cooling to the compartment; the refrigerator can also be configured to use a fan to drive air to exchange heat with the evaporator, and the air after heat exchange enters the compartment. In the embodiment, the valve is a solenoid valve.

[0050] The refrigerator also includes a controller, which is used to control the compressor and the valve. In some embodiments, the controller is also used to control the fan. The controller is configured to execute the steps of the refrigeration method in the embodiment of the present application.

[0051] like Figure 2 As shown, it is a schematic flow chart of an embodiment of a control method of a refrigeration system in an embodiment of the present application, and the control method of the refrigeration system includes:

[0052] S100, obtaining a first real-time temperature of the evaporator;

[0053] S200, when the first real-time temperature is less than or equal to the shutdown point temperature, controlling the compressor to stop and controlling the valve to close; when the valve is closed, the circuit between the condenser and the evaporator is disconnected;

[0054] S300, obtaining a second real-time temperature of the evaporator;

[0055] S400, when the second real-time temperature is greater than a preset temperature, obtaining the stop time of the compressor; wherein the preset temperature is less than the start-up point temperature and greater than the stop-point temperature;

[0056] S500: If the stop time is less than the shutdown protection time, the valve is controlled to open and run for a preset time; when the valve is opened, the circuit between the condenser and the evaporator is connected.

[0057] In the technical solution of the embodiment of the present application, when the first real-time temperature of the evaporator is less than or equal to the shutdown point temperature, the compressor stops running, and the valve is also closed at this time; that is, after the compressor stops, the refrigerant on the high-pressure side (condenser) cannot flow to the low-pressure side (evaporator), so that the compressor can start with a pressure difference next time to save energy. After that, the evaporator starts to warm up due to the lack of refrigerant supply, and then obtains the second real-time temperature; when the second real-time temperature is greater than the preset temperature, the stop time of the compressor is obtained; if the stop time is less than the shutdown protection time, the valve is controlled to open and run for the preset time, at which time the circuit between the condenser and the evaporator is connected, so that part of the refrigerant can flow to the evaporator, so that the temperature of the evaporator drops and the temperature recovery speed of the evaporator is delayed, so that when the temperature of the evaporator rises to the start-up point temperature, the shutdown time of the compressor has reached the shutdown protection time and the compressor can be started; that is, before the shutdown time of the compressor has not reached the shutdown protection time, the temperature of the evaporator is controlled below the start-up point temperature.

[0058] In some embodiments, the refrigerator is a dual-system refrigerator, that is, the evaporator includes a freezing evaporator and a refrigerating evaporator. In a dual-system refrigerator, the temperature of the freezing evaporator can be used as the control condition for starting or stopping the compressor, or the temperature of the refrigerating evaporator can be used as the control condition for starting or stopping the compressor.

[0059] In a single-system refrigerator, that is, the evaporator has only one. At this time, the temperature of the evaporator is used as the control condition for starting or stopping the compressor.

[0060] In an embodiment, the temperature of the evaporator is collected by a temperature sensor provided on the evaporator, and it can be the temperature of the evaporator surface.

[0061] In an embodiment, the start-up point temperature, the shutdown point temperature, and the shutdown protection duration are all preset values, which are specifically set according to the functional requirements of the refrigerator and will not be specifically elaborated here. The preset duration is the duration for which the valve is opened, and it can be a preset value (according to the functional requirements of the refrigerator) or a value determined according to some parameters (illustrated in the following embodiments).

[0062] As an alternative implementation of the above embodiment, as Figure 3 shown, the control method further includes:

[0063] S600, after the valve is opened for the preset duration, control the valve to close, and execute step S300 and step S400.

[0064] In an embodiment, after the valve is opened for the preset duration, the valve closes. At this time, step S300 and step S400 are executed again. If the stop duration is less than the shutdown protection duration, control the valve to open again and operate for the preset duration, so as to control the temperature of the evaporator below the start-up point temperature before the shutdown duration of the compressor reaches the shutdown protection duration.

[0065] In addition, after the valve is opened, the refrigerant flow in the condenser is in the process of pressure relief; thus, in some special cases, such as after the valve is opened multiple times, the refrigerant will no longer flow to the evaporator. Therefore, a loop termination condition is set. After the loop termination condition is reached, steps S500 and S600 are stopped from being executed, that is, when there is no pressure difference between the condenser and the evaporator, the state of the valve is no longer switched. Wait until the compressor stop duration reaches the shutdown protection duration and the second real-time temperature reaches the startup point temperature, and then control the compressor to turn on and the valve to open. The loop termination condition is: the number of times the valve is opened reaches a preset number. For example, after the valve is opened 3 times, place the valve in the open state or the current state, and only wait until the compressor stop duration reaches the shutdown protection duration. In this case, there may be no or a small pressure difference between the condenser and the evaporator, and the compressor starts under no pressure difference or low pressure difference. At this time, the startup energy consumption of the compressor is relatively large but it will not cause the temperature in the compartment to be higher; however, setting the loop termination condition is to avoid ineffective control (that is, opening or closing the valve has no effect on the startup of the compressor).

[0066] However, in the actual application process, since the shutdown protection duration is usually 5 - 8 minutes, the valve usually only needs to be opened once to control the temperature of the evaporator below the startup point temperature before the compressor shutdown duration reaches the shutdown protection duration. The above special cases belong to the control under extreme working conditions.

[0067] As an alternative implementation of the above embodiment, as Figure 4 shown, the control method further includes:

[0068] S700, when the stop duration reaches the shutdown protection duration, determine whether the second real-time temperature is greater than the startup point temperature;

[0069] S800, if so, control the compressor to turn on and control the valve to open until the first real-time temperature is less than or equal to the shutdown point temperature;

[0070] S900, if not, wait until the second real-time temperature reaches the startup point temperature.

[0071] In some embodiments, if when the second real-time temperature is greater than the preset temperature, the stop duration of the compressor obtained has reached the shutdown protection duration, then directly determine whether the second real-time temperature is greater than the startup point temperature at this time; if so, turn on the compressor and open the valve to cool down until the first real-time temperature is less than or equal to the shutdown point temperature, and then re-enter the compressor shutdown mode. If not, at this time, the compressor has passed the shutdown protection duration, and at this time, normally wait until the second real-time temperature reaches the startup point temperature, and then control the compressor to start.

[0072] In some embodiments, if when the second real-time temperature is greater than the preset temperature, the obtained stop duration of the compressor has not reached the shutdown protection duration, then at this time, control the valve to open and operate for a preset duration to reduce the temperature of the evaporator. After that, if when the second real-time temperature is greater than the preset temperature, the obtained stop duration of the compressor has reached the shutdown protection duration, then directly determine whether the second real-time temperature is greater than the startup point temperature at this time; if so, turn on the compressor and open the valve to cool down until the first real-time temperature is less than or equal to the shutdown point temperature, and re-enter the compressor shutdown mode. If not, at this time the compressor has passed the shutdown protection duration, and at this time normally wait until the second real-time temperature reaches the startup point temperature and then turn on the machine.

[0073] In some embodiments, if when the second real-time temperature is greater than the preset temperature, the obtained stop duration of the compressor has not reached the shutdown protection duration, then at this time, control the valve to open and operate for a preset duration to reduce the temperature of the evaporator. After that, if when the second real-time temperature is greater than the preset temperature, the obtained stop duration of the compressor has not reached the shutdown protection duration, then at this time control the valve to open and operate for a preset duration again to reduce the temperature of the evaporator; after that, if the obtained stop duration of the compressor has reached the shutdown protection duration, then directly determine whether the second real-time temperature is greater than the startup point temperature at this time; if so, turn on the compressor and open the valve to cool down until the first real-time temperature is less than or equal to the shutdown point temperature, and re-enter the compressor shutdown mode. If not, at this time the compressor has passed the shutdown protection duration, and at this time normally wait until the second real-time temperature reaches the startup point temperature and then turn on the machine.

[0074] In some embodiments, if the stop duration of the compressor obtained when the second real-time temperature is greater than the preset temperature has not reached the shutdown protection duration, then at this time, control the valve to open and operate for a preset duration to reduce the temperature of the evaporator. After that, if the stop duration of the compressor obtained when the second real-time temperature is greater than the preset temperature has not reached the shutdown protection duration, judge the number of times the valve has been opened. If it is less than the preset number of times, then at this time, control the valve to open and operate for a preset duration again to reduce the temperature of the evaporator; after that, if the stop duration of the compressor obtained has reached the shutdown protection duration, then directly judge whether the second real-time temperature is greater than the startup point temperature; if so, the compressor is turned on and the valve is opened to perform cooling until the first real-time temperature is less than or equal to the shutdown point temperature, and then enter the compressor shutdown mode again. If not, at this time, the compressor has passed the shutdown protection duration, and then normally wait until the second real-time temperature reaches the startup point temperature and then turn on the machine. If the preset number of times is reached, maintain the current state or the open state of the valve, and at this time, directly wait for the stop duration of the compressor to reach the shutdown protection duration and the second real-time temperature to reach the startup point temperature.

[0075] As an alternative implementation of the above embodiment, the preset temperature is 1-2 °C lower than the startup point temperature. In this embodiment, that is, when the temperature of the evaporator is about to reach the startup point temperature, the valve is opened for a preset duration to reduce the temperature of the evaporator and delay the time for the evaporator to rise back to the startup point temperature. In the embodiment, for example, if the startup point temperature is T °C, then the preset temperature is T-1, T-2 or T-1.5 °C.

[0076] As an alternative implementation of the above embodiment, the control method further includes: after the compressor stops and the valve closes, obtain the first pressure of the condenser and the second pressure of the evaporator; determine the preset duration according to the difference between the first pressure and the second pressure and the preset pressure difference-duration mapping relationship. In the embodiment, the pressure can be collected by a pressure sensor. After the valve and the compressor stop, obtain the first pressure of the condenser and the second pressure of the evaporator; determine the preset duration according to the difference between the first pressure and the second pressure and the preset pressure difference-duration mapping relationship, so that the preset duration is determined according to the difference.

[0077] For example, in the embodiment, the greater the pressure difference, the more refrigerant is allowed to flow into the evaporator when the compressor stops. Consequently, the preset duration can be set longer to enhance the delay effect. In the embodiment, the smaller the pressure difference, the less refrigerant is allowed to flow into the evaporator when the compressor stops, and the preset duration is shorter, aiming to ensure the pressure holding effect while delaying the temperature rise of the evaporator. In the embodiment, the preset pressure difference-duration mapping relationship can be a preset table or a preset curve. The difference between the first pressure and the second pressure and the preset duration have a positive correlation.

[0078] As an alternative implementation of the above embodiment, the control method further includes:

[0079] After the compressor stops and the valve closes, obtain the ambient temperature;

[0080] According to the ambient temperature, determine the temperature difference between the startup point temperature and the preset temperature;

[0081] According to the startup point temperature and the temperature difference, determine the preset temperature;

[0082] Wherein, there is a positive correlation between the ambient temperature and the temperature difference.

[0083] In this embodiment, the ambient temperature is a key factor affecting the speed of the evaporator's temperature rise. The higher the ambient temperature, the faster the evaporator's temperature rises. Therefore, in the embodiment, according to the ambient temperature, determine the temperature difference between the startup point temperature and the preset temperature; there is a positive correlation between the ambient temperature and the temperature difference. That is, the higher the ambient temperature, the greater the temperature difference, and the lower the preset temperature is compared to the startup point temperature. Since the higher the ambient temperature, the easier it is for the evaporator to reach the preset temperature more quickly, when the temperature of the evaporator reaches a lower preset temperature, the valve is opened to cool the evaporator and timely slow down the cooling speed in the case of high ambient temperature. For example, when the ambient temperature is 10°C, the temperature difference is 1°C. When the ambient temperature is 30°C, the temperature difference is 2°C.

[0084] As an alternative implementation of the above embodiment, the control method further includes:

[0085] The step of controlling the valve to open and operate for a preset duration when the stop duration is less than the shutdown protection duration includes:

[0086] Determine the duration difference between the stop duration and the shutdown protection duration;

[0087] According to the duration difference, determine the preset duration; wherein, there is a positive correlation between the duration difference and the preset duration.

[0088] In the embodiment, the preset duration is determined by the time difference between the stop duration and the shutdown protection duration. If the time difference between the stop duration and the shutdown protection duration is long, it means that it will take a long time for the compressor to start, and at this time, the start-up point temperature is about to be reached, that is, the evaporator has a fast temperature recovery speed. At this time, the valve opening time can be longer to allow more refrigerant to flow to the evaporator to slow down the temperature recovery speed of the evaporator. For example, in the embodiment, the time difference is 2 minutes, and the preset duration is 10s; the time difference is 1 minute, and the preset duration is 5s.

[0089] In order to better implement the control method of the refrigeration system in the embodiment of the present application, based on the control method of the refrigeration system, the embodiment of the present application also provides a control device of the refrigeration system, such as Figure 5 As shown, the control device of the refrigeration system includes:

[0090] An acquisition module 10 is configured to acquire a first real-time temperature of the evaporator;

[0091] The control module 20 is configured to control the compressor to stop and the valve to close when the first real-time temperature is less than or equal to the shutdown point temperature; when the valve is closed, the circuit between the condenser and the evaporator is disconnected;

[0092] The acquisition module is configured to acquire a second real-time temperature of the evaporator;

[0093] The acquisition module is configured to acquire the stop time of the compressor when the second real-time temperature is greater than a preset temperature; wherein the preset temperature is less than the start-up point temperature and greater than the stop-point temperature;

[0094] The acquisition module is configured to control the valve to open and run for a preset time if the stop time is less than the shutdown protection time; when the valve is opened, the circuit between the condenser and the evaporator is connected.

[0095] Optionally, after the valve is opened for the preset time period, the control module controls the valve to close and executes step S300 and step S400.

[0096] Optionally, the control device further includes a judgment module, and the judgment module is used in S700 to judge whether the second real-time temperature is greater than the start-up point temperature when the stop time reaches the shutdown protection time;

[0097] The control module is used to control the compressor to turn on and control the valve to open until the first real-time temperature is less than or equal to the shutdown point temperature; if not, wait for the second real-time temperature to reach the startup point temperature.

[0098] Optionally, the preset temperature is 1-2 °C lower than the startup point temperature.

[0099] Optionally, the control acquisition module is configured to obtain the first pressure of the condenser and the second pressure of the evaporator after the compressor stops and the valve closes; the determination module is configured to determine the preset duration according to the difference between the first pressure and the second pressure and a preset pressure difference-duration mapping relationship.

[0100] Optionally, the acquisition module is configured to obtain the ambient temperature after the compressor stops and the valve closes; the determination module is configured to determine the temperature difference between the startup point temperature and the preset temperature according to the ambient temperature; the determination module is configured to determine the preset temperature according to the startup point temperature and the temperature difference; wherein, there is a positive correlation between the ambient temperature and the temperature difference.

[0101] Optionally, when the control module is configured to control the valve to open and operate for a preset duration if the stop duration is less than the shutdown protection duration, it includes: the determination module is configured to determine the duration difference between the stop duration and the shutdown protection duration; the determination module is configured to determine the preset duration according to the duration difference; wherein, there is a positive correlation between the duration difference and the preset duration.

[0102] The embodiment of the present application also provides a control system for a refrigeration system, including: one or more processors; a memory; and one or more application programs, wherein the one or more application programs are stored in the memory and configured to be executed by the processor to implement the control method of the refrigeration system as described above.

[0103] Generally, the control system of the refrigeration system includes: at least one processor, at least one memory, and a control program of the control system of the refrigeration system stored on the memory and executable on the processor, and the control program of the control system of the refrigeration system is configured to implement the steps of the control method as described above.

[0104] The processor may include one or more processing cores, such as a 4-core processor, an 8-core processor, etc. The processor may be implemented in at least one hardware form of DSP (Digital Signal Processing), FPGA (Field-Programmable Gate Array), or PLA (Programmable Logic Array). The processor may also include a main processor and a coprocessor. The main processor is a processor for processing data in the wake state, also known as the CPU (Central Processing Unit); the coprocessor is a low-power processor for processing data in the standby state. In some embodiments, the processor may be integrated with a GPU (Graphics Processing Unit), and the GPU is responsible for rendering and drawing the content to be displayed on the display screen. The processor may also include an AI (Artificial Intelligence) processor, which is used to process the control method operations of the control system of the refrigeration system, so that the control method model of the control system of the refrigeration system can autonomously train and learn to improve efficiency and accuracy.

[0105] The memory may include one or more computer-readable storage media, and the computer-readable storage media may be non-transitory. The memory may also include high-speed random access memory and non-volatile memory, such as one or more disk storage devices and flash storage devices. In some embodiments, the non-transitory computer-readable storage medium in the memory is used to store at least one instruction, and the at least one instruction is used to be executed by the processor to implement the control method of the refrigeration system provided in the method embodiment of the present application.

[0106] S100, obtain the first real-time temperature of the evaporator;

[0107] S200, when the first real-time temperature is less than or equal to the shutdown point temperature, control the compressor to stop and control the valve to close; when the valve is closed, the circuit between the condenser and the evaporator is disconnected;

[0108] S300, obtain the second real-time temperature of the evaporator;

[0109] S400, when the second real-time temperature is greater than the preset temperature, obtain the stop duration of the compressor; wherein, the preset temperature is less than the startup point temperature and greater than the shutdown point temperature;

[0110] S500, if the stop duration is less than the shutdown protection duration, control the valve to open and operate for a preset duration; when the valve is open, the circuit between the condenser and the evaporator is conducted.

[0111] Optionally, the control method further includes:

[0112] S600, after the valve has been open for the preset duration, control the valve to close and execute step S300 and step S400.

[0113] Optionally, the control method further includes:

[0114] S700, when the stop duration reaches the shutdown protection duration, determine whether the second real-time temperature is greater than the startup point temperature;

[0115] S800, if so, control the compressor to turn on and control the valve to open until the first real-time temperature is less than or equal to the shutdown point temperature;

[0116] S900, if not, wait for the second real-time temperature to reach the startup point temperature.

[0117] Optionally, the preset temperature is 1 - 2 °C lower than the startup point temperature.

[0118] Optionally, the control method further includes:

[0119] After the compressor stops and the valve closes, obtain the first pressure of the condenser and the second pressure of the evaporator;

[0120] Determine the preset duration according to the difference between the first pressure and the second pressure and the preset pressure difference - duration mapping relationship.

[0121] Optionally, the control method further includes:

[0122] After the compressor stops and the valve closes, obtain the ambient temperature;

[0123] Determine the temperature difference between the startup point temperature and the preset temperature according to the ambient temperature;

[0124] Determine the preset temperature according to the startup point temperature and the temperature difference;

[0125] Wherein, there is a positive correlation between the ambient temperature and the temperature difference.

[0126] Optionally, the control method further includes:

[0127] The "if the stop duration is less than the shutdown protection duration, control the valve to open and operate for a preset duration" includes:

[0128] Determine the time difference between the stopping duration and the shutdown protection duration;

[0129] Determine the preset duration according to the time difference; wherein, there is a positive correlation between the time difference and the preset duration.

[0130] The above has introduced in detail a control method, device, refrigerator, and computer-readable storage medium for a refrigeration system provided by an embodiment of the present application. Specific examples are used herein to elaborate on the principles and implementation manners of the present invention. The description of the above embodiments is only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A control method for a refrigeration system, characterized in that The refrigeration system includes a compressor, a condenser, a valve, and an evaporator; wherein, the compressor, the condenser, the valve, and the evaporator are connected in sequence; the control method includes: S100, obtaining the first real-time temperature of the evaporator; S200, when the first real-time temperature is less than or equal to the shutdown point temperature, controlling the compressor to stop and controlling the valve to close; when the valve is closed, the circuit between the condenser and the evaporator is disconnected; S300, obtaining the second real-time temperature of the evaporator; S400, when the second real-time temperature is greater than the preset temperature, obtaining the stop duration of the compressor; wherein, the preset temperature is less than the startup point temperature and greater than the shutdown point temperature; S500, if the stop duration is less than the shutdown protection duration, controlling the valve to open and operate for a preset duration; when the valve is open, the circuit between the condenser and the evaporator is conducted.

2. The control method according to claim 1, wherein The control method further includes: S600, after the valve is open for the preset duration, controlling the valve to close, and performing step S300 and step S400.

3. The control method according to claim 1 or 2, characterized in that The control method further includes: S700, when the stop duration reaches the shutdown protection duration, determining whether the second real-time temperature is greater than the startup point temperature; S800, if so, controlling the compressor to open and controlling the valve to open until the first real-time temperature is less than or equal to the shutdown point temperature; S900, if not, waiting for the second real-time temperature to reach the startup point temperature.

4. The control method according to claim 1, wherein, The preset temperature is 1 - 2 °C less than the startup point temperature.

5. The control method according to claim 1, wherein The control method further includes: after the compressor stops and the valve closes, obtaining the first pressure of the condenser and the second pressure of the evaporator; determining the preset duration according to the difference between the first pressure and the second pressure and the preset pressure difference - duration mapping relationship.

6. The control method according to claim 1, characterized in that The control method further includes: after the compressor stops and the valve closes, obtaining the ambient temperature; determining the temperature difference between the startup point temperature and the preset temperature according to the ambient temperature; determining the preset temperature according to the startup point temperature and the temperature difference; wherein, there is a positive correlation between the ambient temperature and the temperature difference.

7. The control method according to claim 1, characterized in that The control method further includes: wherein, if the stop duration is less than the shutdown protection duration, controlling the valve to open and operate for a preset duration includes: determining the duration difference between the stop duration and the shutdown protection duration; determining the preset duration according to the duration difference; wherein, there is a positive correlation between the duration difference and the preset duration.

8. A control device for a refrigeration system, characterized in that, The refrigeration system includes a compressor, a condenser, a valve, and an evaporator; wherein, the compressor, the condenser, the valve, and the evaporator are connected in sequence; the control device includes: an acquisition module configured to obtain the first real-time temperature of the evaporator; a control module configured to, when the first real-time temperature is less than or equal to the shutdown point temperature, control the compressor to stop and control the valve to close; when the valve is closed, the circuit between the condenser and the evaporator is disconnected; the acquisition module configured to obtain the second real-time temperature of the evaporator; The obtaining module is configured to obtain the stop duration of the compressor when the second real-time temperature is greater than a preset temperature; wherein, the preset temperature is less than the start-up point temperature and greater than the shutdown point temperature. The obtaining module is configured to control the valve to open and operate for a preset duration if the stop duration is less than the shutdown protection duration; when the valve is open, the circuit between the condenser and the evaporator is conducted.

9. A refrigerator, characterized in that, It includes a controller and a refrigeration system, and the controller is used to control the refrigeration system to execute the steps in the control method according to any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, A computer program is stored thereon, and the computer program is loaded by a processor to execute the steps in the control method according to any one of claims 1 to 7.

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