Method and device for controlling refrigerator, refrigerator and computer readable storage medium

Abstract

The invention relates to the technical field of intelligent household appliances, and discloses a refrigerator control method which comprises the following steps: determining the air volume required by heat dissipation of a heat exchanger according to the environment temperature, the temperature of a compressor bin and the temperature of the heat exchanger; and the rotating speed of the cooling fan is adjusted according to the air volume required by heat dissipation. The air volume required for heat dissipation of the heat exchanger is calculated through the environment temperature, the temperature of the compressor bin and the temperature of the heat exchanger, excessive variable parameters do not need to participate in calculation, and the variable parameters for calculating the air volume required for heat dissipation of the heat exchanger are reduced. Therefore, the accuracy of calculation of the air volume required by heat dissipation of the heat exchanger can be improved, and control over the rotating speed of the cooling fan is more accurate. The invention further discloses a device for controlling the refrigerator, the refrigerator and a computer readable storage medium.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, and for example, relates to a method and device for controlling a freezer, a freezer, and a computer-readable storage medium. Background Art

[0002] At present, refrigeration equipment such as freezers dissipates heat from the condenser through a cooling fan to achieve heat exchange. The amount of heat exchanged depends on the heat load of the freezer. When the heat load is large, a large air volume is required to accelerate heat exchange. When the heat load is small, not too much air volume is needed to meet the heat exchange requirements. Currently, most cooling fans of freezers operate at a constant speed or simply adjust the fan speed according to different ambient temperatures to achieve energy-saving purposes, and the control accuracy is poor.

[0003] The related art discloses a method for controlling an air conditioner condenser fan, including the following steps: collecting and calculating the blower gear and compressor speed according to the external ambient temperature and sunlight intensity; calculating the steady-state evaporation temperature of the refrigerant; calculating the steady-state evaporation pressure of the refrigerant; calculating the optimal condensation pressure for refrigeration; calculating the optimal condensation temperature of the refrigerant; calculating the refrigeration capacity under the steady-state heat load; calculating the total heat dissipation required by the condenser and the optimal air volume of the condenser fan; calculating the duty ratio of the condenser fan and operating the condenser fan according to the duty ratio; after a preset period, recalculating the current optimal condensation pressure; collecting and judging the difference between the actual pressure of the condenser and the current optimal condensation pressure and the size of a preset threshold; which can effectively improve the control accuracy of the air conditioner condenser fan.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that at least the following problems exist in the related art:

[0005] To a certain extent, the related art improves the accuracy of cooling fan control. However, in the actual application process, calculating the total heat dissipation and the optimal air volume of the condenser fan using the related art requires calculating parameters such as the steady-state evaporation temperature, steady-state evaporation pressure, optimal condensation pressure, optimal condensation temperature, and refrigeration capacity under the steady-state heat load. There are too many variable parameters required, resulting in poor accuracy of the final result, and thus inaccurate control of the cooling fan speed.

[0006] It should be noted that the information disclosed in the above background art section is only used to enhance the understanding of the background of the present application, and thus may include information that does not constitute the prior art known to those of ordinary skill in the art. Summary of the Invention

[0007] To have a basic understanding of some aspects of the disclosed embodiments, a simple summary is given below. The summary is not a general review, nor is it intended to identify key / important constituent elements or delineate the protection scope of these embodiments, but rather serves as a preface to the subsequent detailed description.

[0008] Embodiments of the present disclosure provide a method and device for controlling a refrigerator, a refrigerator, and a computer-readable storage medium, so as to reduce variable parameters for calculating the air volume required for heat dissipation of a heat exchanger, improve the accuracy of calculating the air volume required for heat dissipation of the heat exchanger, and thus make the control of the cooling fan speed more accurate.

[0009] In some embodiments, the refrigerator includes a cooling fan for heat dissipation of the radiator; the method includes: determining the air volume required for heat dissipation of the heat exchanger according to the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger; and adjusting the speed of the cooling fan according to the air volume required for heat dissipation.

[0010] Optionally, determining the air volume required for heat dissipation of the heat exchanger according to the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger includes: determining the heat load of the refrigerator according to the ambient temperature; and determining the air volume required for heat dissipation of the heat exchanger according to the heat load of the refrigerator, the temperature of the compressor compartment, and the temperature of the heat exchanger.

[0011] Optionally, determining the heat load of the refrigerator according to the ambient temperature includes: calculating Q = S × K × T; where Q is the heat load of the refrigerator, S is the wall area of the refrigerator, K is the heat transfer coefficient, and T is the ambient temperature.

[0012] Optionally, determining the air volume required for heat dissipation of the heat exchanger according to the heat load of the refrigerator, the temperature of the compressor compartment, and the temperature of the heat exchanger includes: determining the temperature difference before and after air heat exchange according to the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger; and determining the air volume required for heat dissipation of the heat exchanger according to the heat load of the refrigerator and the temperature difference before and after air heat exchange.

[0013] Optionally, determining the temperature difference before and after air heat exchange according to the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger includes: when the heat exchanger is a condenser, calculating ΔT = T1 - ΔTm - T2; when the heat exchanger is an evaporator, calculating ΔT = T2 - (T1 + ΔTm); where ΔT is the temperature difference before and after air heat exchange, T1 is the temperature of the heat exchanger, when the heat exchanger is a condenser, T2 is the temperature of the compressor compartment, when the heat exchanger is an evaporator, T2 is the average temperature of the inner compartment of the refrigerator, and ΔTm is the temperature difference between the air after heat exchange and the heat exchanger.

[0014] Optionally, determining the air volume required for heat dissipation of the heat exchanger according to the heat load of the refrigerator and the temperature difference before and after air heat exchange includes:

[0015] Calculating

[0016] where V is the air volume required for heat dissipation of the heat exchanger, Q is the heat load of the refrigerator, ρ is the density of air, ω is the specific heat capacity of air, and ΔT is the temperature difference before and after air heat exchange.

[0017] Optionally, adjust the rotation speed of the cooling fan according to the air volume required for heat dissipation, including: determining the duty cycle of the cooling fan according to the air volume required for heat dissipation; controlling the rotation of the cooling fan according to the duty cycle.

[0018] Optionally, determining the duty cycle of the cooling fan according to the air volume required for heat dissipation includes: when the air volume required for heat dissipation is less than or equal to the first air volume, determining the duty cycle as the first duty cycle; when the air volume required for heat dissipation is greater than or equal to the second air volume, determining the duty cycle as the second duty cycle; when the air volume required for heat dissipation is greater than the first air volume and less than the second air volume, determining the duty cycle of the cooling fan according to the first air volume, the air volume required for heat dissipation, the second air volume, the first duty cycle, and the second duty cycle. Wherein, the first duty cycle is less than the second duty cycle, and the first air volume is less than the second air volume.

[0019] Optionally, determining the duty cycle of the cooling fan according to the first air volume, the air volume required for heat dissipation, the second air volume, the first duty cycle, and the second duty cycle includes:

[0020] Calculate

[0021] where D is the duty cycle of the cooling fan, Dmax is the second duty cycle, Dmin is the first duty cycle, V is the air volume required for heat dissipation, Vmax is the second air volume, and Vmin is the first air volume.

[0022] In some embodiments, the device includes: a processor and a memory storing program instructions, and the processor is configured to execute the above method for controlling the refrigerator when executing the above program instructions.

[0023] In some embodiments, the refrigerator includes:

[0024] A refrigerator body including a cooling fan for dissipating heat from the radiator; and,

[0025] The above device for controlling the refrigerator is installed on the refrigerator body.

[0026] In some embodiments, the computer-readable storage medium stores program instructions, and when the above program instructions are running, they execute the above method for controlling the refrigerator.

[0027] The method and device for controlling a refrigerator, the refrigerator, and the computer-readable storage medium provided by the embodiments of the present disclosure can achieve the following technical effects:

[0028] According to the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger, determine the air volume required for the heat dissipation of the heat exchanger, and adjust the rotational speed of the cooling fan according to the air volume required for heat dissipation. By using the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger, calculate the air volume required for the heat dissipation of the heat exchanger. Without excessive variable parameters involved in the calculation, the variable parameters for calculating the air volume required for the heat dissipation of the heat exchanger are reduced. Thus, the accuracy of calculating the air volume required for the heat dissipation of the heat exchanger can be improved, and the control of the rotational speed of the cooling fan can be made more accurate.

[0029] The above general description and the following description are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] One or more embodiments are exemplarily illustrated by corresponding drawings. These exemplary illustrations and the drawings do not constitute a limitation on the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements. The drawings do not constitute a scale limitation, and in which:

[0031] Figure 1 is a schematic diagram of a method for controlling a refrigerator provided by an embodiment of the present disclosure;

[0032] Figure 2 is a schematic diagram of another method for controlling a refrigerator provided by an embodiment of the present disclosure;

[0033] Figure 3 is a schematic diagram of another method for controlling a refrigerator provided by an embodiment of the present disclosure;

[0034] Figure 4 is a schematic diagram of another method for controlling a refrigerator provided by an embodiment of the present disclosure;

[0035] Figure 5 is a schematic diagram of a device for controlling a refrigerator provided by an embodiment of the present disclosure;

[0036] Figure 6 is a schematic diagram of a refrigerator provided by an embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0037] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the drawings. The attached drawings are only for reference and explanation, and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of explanation, multiple details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be shown in a simplified manner to simplify the drawings.

[0038] In the description, claims, and above-mentioned drawings of the embodiments of the present disclosure, terms such as "first" and "second" are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so as to implement the embodiments of the present disclosure described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0039] Unless otherwise specified, the term "plurality" means two or more.

[0040] In the embodiments of the present disclosure, the character " / " indicates that the objects before and after are in an "or" relationship. For example, A / B means: A or B.

[0041] The term "and / or" is an associative relationship describing an object and indicates that three relationships can exist. For example, A and / or B means: A or B, or, the three relationships of A and B.

[0042] The term "corresponding" may refer to an associative relationship or a binding relationship. A corresponding to B means that there is an associative relationship or a binding relationship between A and B.

[0043] Currently, refrigeration equipment such as freezers dissipates heat from the condenser through a cooling fan to achieve the purpose of heat exchange. The amount of heat exchanged depends on the heat load of the freezer. When the heat load is large, a large air volume is required to accelerate heat exchange. When the heat load is small, too much air volume is not required to meet the heat exchange demand. Currently, most of the cooling fans of freezers operate at a constant speed or simply adjust the fan speed according to different ambient temperatures to achieve energy-saving purposes, and the control accuracy is poor. The related art discloses a method for controlling an air conditioner condenser fan, including the following steps: collecting and calculating the blower gear and compressor speed according to the outside ambient temperature and sunlight intensity; calculating the steady-state evaporation temperature of the refrigerant; calculating the steady-state evaporation pressure of the refrigerant; calculating the optimal condensation pressure for refrigeration; calculating the optimal condensation temperature of the refrigerant; calculating the refrigeration capacity under the steady-state heat load; calculating the total heat dissipation required by the condenser and the optimal air volume of the condenser fan; calculating the duty cycle of the condenser fan and operating the condenser fan according to the duty cycle; after a preset period, recalculating the current optimal condensation pressure; collecting and judging the size of the difference between the actual pressure of the condenser and the current optimal condensation pressure and a preset threshold value; which can effectively improve the control accuracy of the air conditioner condenser fan. Using the related art improves the accuracy of cooling fan control to a certain extent. However, in the actual application process, using the related art to calculate the total heat dissipation and the optimal air volume of the condenser fan requires calculating parameters such as the steady-state evaporation temperature, steady-state evaporation pressure, optimal condensation pressure, optimal condensation temperature, and refrigeration capacity under the steady-state heat load. The required variable parameters are too many, making the accuracy of the final result poor, thus resulting in inaccurate control of the cooling fan speed.

[0044] In the embodiments of the present disclosure, an intelligent household appliance device refers to a household appliance product formed by introducing microprocessor, sensor technology, and network communication technology into household appliance devices, which has the characteristics of intelligent control, intelligent perception, and intelligent application. The operation process of intelligent household appliance devices often depends on the application and processing of modern technologies such as the Internet of Things, the Internet, and electronic chips. For example, intelligent household appliance devices can be connected to electronic devices to achieve remote control and management of intelligent household appliance devices by users.

[0045] In the disclosed embodiments, a terminal device refers to an electronic device with wireless connection function. The terminal device can be communicatively connected to the intelligent household appliance device as described above by connecting to the Internet, or can also be communicatively connected to the intelligent household appliance device as described above directly through means such as Bluetooth, wifi, etc. In some embodiments, the terminal device is, for example, a mobile device, a computer, or an in-vehicle device built in a hover vehicle, etc., or any combination thereof. The mobile device can, for example, include a mobile phone, a smart home device, a wearable device, a smart mobile device, a virtual reality device, etc., or any combination thereof, wherein the wearable device includes, for example: a smart watch, a smart bracelet, a pedometer, etc.

[0046] The embodiments of the present disclosure disclose a freezer, which includes a condenser, a cooling fan, a main control board, a compressor, a temperature sensor, an evaporator, and an air duct. The cooling fan is a variable-frequency fan with PWM speed regulation, including a condensing fan and an evaporating fan. The condensing fan is installed between the condenser and the compressor and is used to dissipate heat from the condenser. The evaporating fan is installed at the evaporator and is used to evaporate the refrigerant in the evaporator, absorb heat and discharge it to the external environment. The cooling fans are all connected to the main control board through wire harnesses. The condenser and the compressor are connected in the refrigeration system through pipelines. The temperature sensors are respectively placed in the middle of the compressor compartment and on the heat exchanger and are used to detect the temperatures in the heat exchanger and the compressor compartment, and are connected to the main control board through wire harnesses. The main control board is integrated with a processor, and the processor is electrically connected to the above-mentioned various electrical components and is used to control the above-mentioned various electrical components to act.

[0047] Figures 1 to 4 It is a schematic diagram of a method for controlling a freezer provided by the embodiments of the present disclosure. Any of the following methods can be executed in the freezer, or can also be executed in a server or a terminal device communicatively connected to the freezer. In the embodiments of the present disclosure, the freezer is used as the execution subject to illustrate the solution.

[0048] Based on the structure of the freezer as described above, as Figure 1 shown, the embodiments of the present disclosure provide a method for controlling a freezer, including:

[0049] S01, the freezer determines the air volume required for the heat exchanger to dissipate heat according to the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger.

[0050] S02. The refrigerator adjusts the rotational speed of the cooling fan according to the air volume required for heat dissipation.

[0051] By using the method for controlling a refrigerator provided in the embodiments of the present disclosure, the air volume required for heat dissipation of the heat exchanger is determined according to the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger, and the rotational speed of the cooling fan is adjusted according to the air volume required for heat dissipation. By calculating the air volume required for heat dissipation of the heat exchanger through the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger, there is no need for too many variable parameters to participate in the calculation, reducing the variable parameters for calculating the air volume required for heat dissipation of the heat exchanger. Therefore, the accuracy of calculating the air volume required for heat dissipation of the heat exchanger can be improved, making the control of the rotational speed of the cooling fan more accurate.

[0052] Based on the above structure of the refrigerator, as Figure 2 shown, the embodiments of the present disclosure provide a method for controlling a refrigerator, including:

[0053] S21. The refrigerator determines the heat load of the refrigerator according to the ambient temperature.

[0054] S22. The refrigerator determines the air volume required for heat dissipation of the heat exchanger according to the heat load of the refrigerator, the temperature of the compressor compartment, and the temperature of the heat exchanger.

[0055] S02. The refrigerator adjusts the rotational speed of the cooling fan according to the air volume required for heat dissipation.

[0056] Among them, the heat load of the refrigerator is in the unit of kCal / hr, that is, the energy or heat consumed per unit time. The heat load of the refrigerator is related to the ambient temperature and the set gear. kcal / hr represents the heat consumption per hour, where kcal represents kilocalorie and hr represents hour.

[0057] By using the method for controlling a refrigerator provided in the embodiments of the present disclosure, the refrigerator determines the heat load of the refrigerator according to the ambient temperature, which can make the heat load of the refrigerator match the ambient temperature and improve the accuracy of the heat load. Then, according to the heat load of the refrigerator, the temperature of the compressor compartment, and the temperature of the heat exchanger, the air volume required for heat dissipation of the heat exchanger is determined, which can make the air volume required for heat dissipation of the heat exchanger match the heat load of the refrigerator and the temperature difference between the compressor compartment and the heat exchanger, so that the air volume of the required cooling fan is more accurate.

[0058] Optionally, the refrigerator determines the heat load of the refrigerator according to the ambient temperature, including: the refrigerator calculates Q = S × K × T; where Q is the heat load of the refrigerator, S is the wall area of the refrigerator, K is the heat transfer coefficient, and T is the ambient temperature.

[0059] Among them, in addition to calculating the heat load of the freezer based on the wall area, heat transfer coefficient, and ambient temperature of the freezer, other mathematical methods using ambient temperature can also be adopted to determine the heat load of the freezer. For example, it can be calculated based on the heat dissipation area and heat dissipation coefficient of the freezer. For a freezer with obvious external heat dissipation conditions, the heat load can be calculated based on the heat dissipation area, heat dissipation coefficient, and ambient temperature of the freezer. Specifically, calculate Q = A × h × (Ta - Tb), where A is the heat dissipation area of the freezer, h is the heat dissipation coefficient, Ta is the ambient temperature, and Tb is the temperature inside the freezer; or it can be calculated based on the heat dissipation loss rate of the freezer. According to the principles of thermodynamics, the heat exchange between the freezer and the environment can be described by the heat dissipation loss rate. By measuring the heat dissipation loss rate of the freezer and combining it with the ambient temperature, the heat load can be calculated. Specifically, calculate Q = E × A × ΔT, where E is the heat dissipation loss rate, A is the outer surface area of the freezer, and ΔT is the temperature difference between the inside and outside of the freezer; and other methods, etc.

[0060] In this way, the wall area of the freezer is the main interface for heat exchange, and heat is exchanged between the inside of the freezer and the external environment through this interface. Therefore, the wall area is an important factor determining the size of the heat load. The heat transfer coefficient represents the efficiency of heat transfer, which depends on the thermal conductivity of the freezer material, the design of the freezer (such as whether it has an insulating layer), and external environmental conditions (such as wind speed and ambient temperature). The heat transfer coefficient determines the rate of heat transfer under a given temperature difference. The ambient temperature reflects the temperature of the external environment of the freezer. Since heat will transfer from the inside of the freezer to the external environment, the ambient temperature is a key factor determining the heat load. At a higher ambient temperature, a larger heat load is required to maintain the low temperature inside the freezer. Considering the above three factors, the heat exchange relationship between the freezer and the external environment can be described by the product of the above three parameters. Based on the principles of heat transfer, by actually measuring the wall area, heat transfer coefficient, and ambient temperature, the heat load of the freezer can be calculated more accurately. Moreover, calculating the heat load of the freezer through the wall area, heat transfer coefficient, and ambient temperature of the freezer, which is a direct calculation method based on actual physical parameters, requires fewer parameters, the calculation process is relatively simple, and it can intuitively reflect the heat exchange characteristics of the freezer.

[0061] Based on the above structure of the freezer, as Figure 3 shown, an embodiment of the present disclosure provides a method for controlling a freezer, including:

[0062] S21, the freezer determines the heat load of the freezer according to the ambient temperature.

[0063] S31, the freezer determines the temperature difference before and after air heat exchange according to the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger.

[0064] S32. The refrigerator determines the air volume required for the heat dissipation of the heat exchanger according to the heat load of the refrigerator and the temperature difference before and after air heat exchange.

[0065] S02. The refrigerator adjusts the rotation speed of the cooling fan according to the air volume required for heat dissipation.

[0066] By using the method for controlling a refrigerator provided in the embodiment of the present disclosure, the refrigerator determines the temperature difference before and after air heat exchange according to the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger. Considering the temperatures of the compressor compartment and the heat exchanger inside the refrigerator and the effect of air heat exchange, it can characterize the heat exchange performance of the refrigerator. The refrigerator determines the air volume required for the heat dissipation of the heat exchanger according to the heat load of the refrigerator and the temperature difference before and after air heat exchange. Through the temperature difference before and after air heat exchange, the energy consumption and efficiency of the refrigerator can be further characterized, so that the air volume required for heat dissipation matches the energy efficiency and heat load of the refrigerator, improving the accuracy of calculating the air volume required for the heat dissipation of the heat exchanger.

[0067] Optionally, the refrigerator determines the temperature difference before and after air heat exchange according to the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger, including: when the heat exchanger is a condenser, the refrigerator calculates ΔT = T1 - ΔTm - T2; when the heat exchanger is an evaporator, the refrigerator calculates ΔT = T2 - (T1 + ΔTm); where ΔT is the temperature difference before and after air heat exchange, T1 is the temperature of the heat exchanger, when the heat exchanger is a condenser, T2 is the temperature of the compressor compartment, when the heat exchanger is an evaporator, T2 is the average temperature of the inner compartment of the refrigerator, and ΔTm is the temperature difference between the air after heat exchange and the heat exchanger.

[0068] Wherein, T1 is the temperature of the surface of the heat exchanger, in °C, collected by the temperature sensor at the corresponding position. ΔTm is the temperature difference between the air after heat exchange and the heat exchanger, with a selected value of 3°C or an approximate constant. T2 is the temperature of the compressor compartment or the average temperature of the inner compartment of the refrigerator, in °C, collected by the temperature sensor at the corresponding position.

[0069] Among them, in addition to the above solutions disclosed in the embodiments of the present disclosure, a mathematical method can also be used to determine the temperature difference before and after air heat exchange according to the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger. For example, a multiple linear regression model can be used to predict the temperature difference before and after air heat exchange based on the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger. By collecting a large amount of data, establishing a multiple linear regression model, and using known parameter values for prediction. Specifically, calculate ΔT = β0 + β1×T1 + β2×T2 + β3×ΔTm, where ΔT is the temperature difference before and after air heat exchange, T1 is the temperature of the heat exchanger, T2 is the temperature of the compressor compartment or the average temperature of the inner compartment of the freezer, ΔTm is the temperature difference between the air after heat exchange and the heat exchanger, and β0, β1, β2, and β3 are regression coefficients; alternatively, a support vector regression model can be used to predict the temperature difference before and after air heat exchange based on the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger. Specifically, calculate ΔT = f(T1, T2, ΔTm), where f is the prediction function of the support vector regression model; and other methods, etc.

[0070] In this way, based on the principle of heat balance, when the air passes through the condenser, it will absorb heat. This heat comes from three parts: part of it comes from the condenser, part from the compressor compartment, and part is the heat carried by the temperature difference between the air and the condenser. Therefore, the total temperature change before and after air heat exchange is the sum of these three parts of heat. When the heat exchanger is an evaporator, it is similar to the condenser, but in the opposite direction. When the air passes through the evaporator, it will release heat. This heat is given to three parts: part to the inner compartment of the freezer, part to the evaporator, and part is the heat released by the temperature difference between the air and the evaporator. Therefore, the total temperature change is the difference between these three parts of heat. Based on the principles of heat balance and transfer, the temperature change of the air when passing through the condenser or evaporator can be accurately quantified.

[0071] Optionally, the freezer determines the air volume required for heat dissipation of the heat exchanger according to the heat load of the freezer and the temperature difference before and after air heat exchange, including:

[0072] The freezer calculates

[0073] where V is the air volume required for heat dissipation of the heat exchanger, with the unit of m 3 / min, Q is the heat load of the freezer, ρ is the density of air, with the unit of Kg / m 3 , which is a constant value under certain temperature and pressure, ω is the specific heat capacity of air, with the unit of kJ / kg.k, which is a constant value under certain temperature and pressure, and △T is the temperature difference before and after air heat exchange, with the unit of K.

[0074] Among them, in addition to the above solutions disclosed in the embodiments of the present disclosure, a mathematical method can also be used to determine the air volume required for the heat exchanger to dissipate heat according to the heat load of the refrigerator and the temperature difference before and after air heat exchange. For example, a fluid dynamics model can be used to calculate the air volume required for the heat exchanger to dissipate heat. Specifically, by establishing a fluid dynamics model and simulating the flow and heat exchange process of air in the heat exchanger, the air volume required for heat dissipation can be calculated. The specific calculation formula depends on the fluid dynamics model and parameters used; alternatively, based on the experience and data in the refrigerator industry, some empirical formulas can be summarized to calculate the air volume required for the heat exchanger to dissipate heat, which can be determined based on a large amount of experimental data and practical application experience; and other methods, etc.

[0075] In this way, based on the principles of heat balance and aerodynamics, in order to dissipate the heat load of the refrigerator, a certain amount of air volume needs to pass through the heat exchanger. Since the air volume is jointly determined by the heat load of the refrigerator, the density of air, the specific heat capacity of air, and the temperature difference before and after air heat exchange. Specifically, the heat load needs to be absorbed and dissipated by a certain amount of air, and this amount is jointly determined by the density of air and the specific heat capacity of air to determine the heat-carrying capacity of air. The temperature difference before and after air heat exchange determines the temperature change of the air when passing through the heat exchanger, thereby affecting its heat-carrying capacity. Therefore, through the above formula, the air volume required for the heat exchanger to dissipate heat can be calculated according to the heat load of the refrigerator and the temperature difference before and after air heat exchange. In addition, the variables are only the ambient temperature T, the temperature T1 of the heat exchanger, the temperature of the compressor compartment, or the average temperature T2 of the inner compartment of the refrigerator, and real-time data of these three variables can be accurately collected by sensors, greatly improving the accuracy of calculating the air volume required for the heat exchanger to dissipate heat.

[0076] Based on the above structure of the refrigerator, as Figure 4 shown, the embodiments of the present disclosure provide a method for controlling a refrigerator, including:

[0077] S01, the refrigerator determines the air volume required for the heat exchanger to dissipate heat according to the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger.

[0078] S41, the refrigerator determines the duty cycle of the cooling fan according to the air volume required for heat dissipation.

[0079] S42, the refrigerator controls the rotation of the cooling fan according to the duty cycle.

[0080] Among them, the duty cycle refers to the ratio of the effective value of the load voltage to the average value within a time period. By adjusting the duty cycle, the air volume of the cooling fan can be controlled, so as to achieve the purpose of reducing energy consumption and improving the energy efficiency of the fan. The smaller the value of the duty cycle of the cooling fan, the lower the fan speed and the smaller the air volume; on the contrary, the larger the value of the duty cycle of the cooling fan, the faster the fan speed and the larger the air volume. Therefore, the rotation speed of the cooling fan can be controlled by adjusting the duty cycle of the cooling fan.

[0081] Using the method for controlling a refrigerator provided by the embodiments of the present disclosure, the refrigerator determines the duty cycle of the cooling fan according to the air volume required for heat dissipation, which can make the duty cycle match the air volume required for heat dissipation, thereby improving the accuracy of the duty cycle. Then, the refrigerator controls the rotation of the cooling fan according to the duty cycle. By precisely controlling the duty cycle of the cooling fan, it can ensure that while meeting the heat dissipation requirements, unnecessary energy consumption is reduced. If the cooling fan runs at full speed for a long time, it will cause energy waste. By adjusting the duty cycle to match the actual heat dissipation requirements, the energy consumption can be significantly reduced.

[0082] Optionally, the refrigerator determines the duty cycle of the cooling fan according to the air volume required for heat dissipation, including: when the air volume required for heat dissipation is less than or equal to the first air volume, the refrigerator determines the duty cycle as the first duty cycle; when the air volume required for heat dissipation is greater than or equal to the second air volume, the refrigerator determines the duty cycle as the second duty cycle; when the air volume required for heat dissipation is greater than the first air volume and less than the second air volume, the refrigerator determines the duty cycle of the cooling fan according to the first air volume, the air volume required for heat dissipation, the second air volume, the first duty cycle, and the second duty cycle. Wherein, the first duty cycle is less than the second duty cycle, and the first air volume is less than the second air volume.

[0083] Wherein, the first duty cycle is the minimum operating duty cycle allowed for the cooling fan, the first air volume is the minimum air volume corresponding to the first duty cycle, the second duty cycle is the maximum operating duty cycle allowed for the cooling fan, and the second air volume is the maximum air volume corresponding to the second duty cycle.

[0084] In this way, the duty cycle of the cooling fan is precisely adjusted according to different heat dissipation requirements. When the heat dissipation requirement is low, a lower duty cycle is used to save energy. When the heat dissipation requirement is high, a higher duty cycle is used to ensure effective heat dissipation.

[0085] Optionally, the refrigerator determines the duty cycle of the cooling fan according to the first air volume, the air volume required for heat dissipation, the second air volume, the first duty cycle, and the second duty cycle, including:

[0086] Calculate

[0087] Wherein, D is the duty cycle of the cooling fan, Dmax is the second duty cycle, Dmin is the first duty cycle, V is the air volume required for heat dissipation, Vmax is the second air volume, and Vmin is the first air volume.

[0088] In this way, the second duty cycle and the first duty cycle are the known maximum and minimum duty cycles, and the second air volume and the first air volume are the corresponding air volumes. Based on linear interpolation and proportional control, the air volume required for heat dissipation is used to calculate the duty cycle of the cooling fan. By comparing the air volume required for heat dissipation with the first air volume and the second air volume, the range of the duty cycle of the cooling fan is determined, and then the value of the duty cycle of the cooling fan is calculated by linear interpolation. (Dmax - Dmin) / (Vmax - Vmin) is the proportionality coefficient, which is used to convert the change in air volume into the change in duty cycle. Through the above proportionality coefficient, it is ensured that when the air volume increases, the duty cycle also increases accordingly, and vice versa. Thus, the duty cycle of the cooling fan can be dynamically adjusted according to the change in heat dissipation requirements, so as to maintain the stable operation of the heat dissipation system. Calculating the duty cycle of the cooling fan according to the air volume required for heat dissipation can accurately calculate the duty cycle of the cooling fan according to the actual heat dissipation requirements, thereby optimizing energy utilization, extending the equipment life, and improving the performance of the freezer.

[0089] Combined with Figure 5 As shown in the figure, an apparatus 800 for controlling a freezer provided by an embodiment of the present disclosure includes a processor 801 and a memory 802. Optionally, the apparatus may further include a communication interface 803 and a bus 804. Among them, the processor 801, the communication interface 803, and the memory 802 can complete mutual communication through the bus 804. The communication interface 803 can be used for information transmission. The processor 801 can call the logical instructions in the memory 802 to execute the method for controlling the freezer in the above embodiment.

[0090] In addition, when the logical instructions in the above-mentioned memory 802 are implemented in the form of software functional units and sold or used as an independent product, they can be stored in a computer-readable storage medium.

[0091] The memory 802, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as program instructions / modules corresponding to the methods in the embodiments of the present disclosure. The processor 801 executes functional applications and data processing by running the program instructions / modules stored in the memory 802, that is, implements the method for controlling the freezer in the above embodiment.

[0092] The memory 802 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system and application programs required for at least one function; the data storage area may store data created according to the use of the terminal device, etc. In addition, the memory 802 may include a high-speed random access memory and may also include a non-volatile memory.

[0093] Combined withFigure 6 As shown, an embodiment of the present disclosure provides a freezer 900, including: a freezer body, and the device 800 for controlling the freezer described above. The device 800 for controlling the freezer is installed on the freezer body. The installation relationship described here is not limited to being placed inside the freezer, but also includes installation connections with other components of the freezer, including but not limited to physical connections, electrical connections, or signal transmission connections, etc. Those skilled in the art can understand that the device 800 for controlling the freezer can be adapted to a feasible freezer body, thereby implementing other feasible embodiments.

[0094] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, and the computer-executable instructions are configured to execute the method for controlling the freezer described above.

[0095] The technical solution of the embodiment of the present disclosure can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in the embodiment of the present disclosure. The foregoing storage medium may be a non-transitory storage medium, including: USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs, etc., which are various media that can store program codes.

[0096] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure, enabling those skilled in the art to practice them. Other embodiments may include structural, logical, electrical, process, and other changes. Embodiments merely represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the terms used in this application are only for describing embodiments and do not limit the claims. As used in the description of the embodiments and the claims, unless the context clearly indicates otherwise, the singular forms "a", "an", and "the" are intended to also include the plural forms. Similarly, as used in this application, the term "and / or" refers to any and all possible combinations of one or more of the associated listed items. Additionally, when used in this application, the term "comprise" and its variants "comprises" and / or "comprising" etc. mean the presence of the stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components, and / or groups of these. Without further limitation, an element defined by the statement "comprising an..." does not exclude the presence of additional identical elements in the process, method, or apparatus that includes the element. Herein, each embodiment may focus on the differences from other embodiments, and the same or similar parts among the embodiments may be referred to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method parts disclosed in the embodiments, the relevant parts may refer to the description of the method parts.

[0097] Those skilled in the art can realize that the units and algorithm steps of each example described in connection with the embodiments disclosed herein can be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are executed in a hardware or software manner may depend on the specific application and design constraints of the technical solution. The skilled person may use different methods for each specific application to implement the described functions, but such implementation should not be considered to exceed the scope of the embodiments of the present disclosure. The skilled person can clearly understand that for the convenience and brevity of description, the specific working processes of the systems, devices, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be elaborated herein.

[0098] In the embodiments disclosed herein, the disclosed methods, products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical function division. In actual implementation, there can be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Additionally, the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces. The indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to implement this embodiment. Additionally, in the embodiments of the present disclosure, the various functional units can be integrated in one processing unit, or each unit can exist physically separately, or two or more units can be integrated in one unit.

[0099] The flowcharts and block diagrams in the accompanying drawings illustrate the possible architectures, functions, and operations of systems, methods, and computer program products according to embodiments of the present disclosure. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks can occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different blocks can also occur in a different order than that disclosed in the description. Sometimes, there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, which can depend on the functions involved. Each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A method for controlling a refrigerator, characterized in that, The refrigerator includes a cooling fan for dissipating heat from the radiator; The method includes: Determine the air volume required for the heat dissipation of the heat exchanger according to the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger; Adjust the rotational speed of the cooling fan according to the air volume required for heat dissipation.

2. The method according to claim 1, characterized in that, Determine the air volume required for the heat dissipation of the heat exchanger according to the ambient temperature, the temperature of the compressor compartment, and the temperature of the heat exchanger, including: Determine the heat load of the refrigerator according to the ambient temperature; Determine the air volume required for the heat dissipation of the heat exchanger according to the heat load of the refrigerator, the temperature of the compressor compartment, and the temperature of the heat exchanger.

3. The method according to claim 2, wherein Determine the heat load of the refrigerator according to the ambient temperature, including: Calculate Q = S × K × T; Wherein, Q is the heat load of the refrigerator, S is the wall area of the refrigerator, K is the heat transfer coefficient, and T is the ambient temperature.

4. The method according to claim 2, characterized in that: Determine the air volume required for the heat dissipation of the heat exchanger according to the heat load of the refrigerator, the temperature of the compressor compartment, and the temperature of the heat exchanger, including: Determine the temperature difference before and after air heat exchange according to the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger; Determine the air volume required for the heat dissipation of the heat exchanger according to the heat load of the refrigerator and the temperature difference before and after air heat exchange.

5. The method according to claim 4, characterized in that, Determine the temperature difference before and after air heat exchange according to the temperature of the compressor compartment, the temperature of the heat exchanger, and the temperature difference between the air after heat exchange and the heat exchanger, including: When the heat exchanger is a condenser, calculate ΔT = T1 - ΔTm - T2; When the heat exchanger is an evaporator, calculate ΔT = T2 - (T1 + ΔTm); Wherein, ΔT is the temperature difference before and after air heat exchange, T1 is the temperature of the heat exchanger, when the heat exchanger is a condenser, T2 is the temperature of the compressor compartment, when the heat exchanger is an evaporator, T2 is the average temperature of the inner compartment of the refrigerator, and ΔTm is the temperature difference between the air after heat exchange and the heat exchanger.

6. The method according to claim 4, characterized in that Determine the air volume required for the heat dissipation of the heat exchanger according to the heat load of the refrigerator and the temperature difference before and after air heat exchange, including: Calculation Wherein, V is the air volume required for the heat dissipation of the heat exchanger, Q is the heat load of the refrigerator, ρ is the density of air, ω is the specific heat capacity of air, and ΔT is the temperature difference before and after air heat exchange.

7. The method according to any one of claims 1 to 6, characterized in that Adjust the rotational speed of the cooling fan according to the air volume required for heat dissipation, including: Determine the duty cycle of the cooling fan according to the air volume required for heat dissipation; Control the rotation of the cooling fan according to the duty cycle.

8. A device for controlling a refrigerator, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the method for controlling a refrigerator according to any one of claims 1 to 7 when running the program instructions.

9. A refrigerator, characterized in that: Including: A refrigerator body including a cooling fan for dissipating heat from the radiator; And, The device for controlling a refrigerator according to claim 8 is installed on the refrigerator body.

10. A computer-readable storage medium storing program instructions, characterized in that, When running, the program instructions are used to cause a computer to execute the method for controlling a refrigerator according to any one of claims 1 to 7.

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