Refrigerator defrosting control method and device and refrigerator

Abstract

The invention discloses a refrigerator defrosting control method and device and a refrigerator. The method comprises the steps that whether the heat exchange efficiency of an evaporator of the refrigerator is reduced or not is detected; when the heat exchange efficiency of the evaporator is reduced, operation parameters of the refrigerator are further detected; whether the operation parameters of the refrigerator belong to a preset parameter range or not is judged; wherein the preset parameter range is used for representing that the operation parameters of the refrigerator cannot cause reduction of the heat exchange efficiency of the evaporator; and when the operation parameters of the refrigerator belong to the preset operation range, the refrigerator is controlled to be defrosted. The problem that in the prior art, the defrosting control time of the refrigerator is not accurate enough is solved, the defrosting time is accurately and timely judged, and the refrigeration effect and the operation stability of the refrigerator are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigerators, and in particular to a refrigerator defrosting control method and device, and a refrigerator. Background Art

[0002] After a refrigerator has been used for a period of time, the surface of the evaporator is often covered with frost, which reduces the heat exchange efficiency. At this time, in order to reach the set temperature, the compressor needs to increase the working time or increase the speed, resulting in an increase in the overall energy consumption of the refrigerator. Therefore, how to enable the refrigerator to accurately determine the amount of frost and determine the timing of defrosting has become a technical problem that needs to be solved urgently.

[0003] To address the above issues, some manufacturers use a periodic defrost strategy, resulting in high energy consumption for the entire machine; some manufacturers monitor the changes in temperature values ​​at the inlet and outlet of the evaporator to infer whether to defrost, but do not consider the impact of the actual operation of the refrigerator, user usage, etc. on the changes in the outlet and inlet temperatures of the evaporator, resulting in misjudgment.

[0004] With regard to the problem of inaccurate defrosting control timing of refrigerators in related technologies, no effective solution has been proposed yet. Summary of the invention

[0005] The present invention provides a refrigerator defrosting control method, a refrigerator defrosting control device and a refrigerator, so as to at least solve the problem that the defrosting control timing of the refrigerator is not accurate enough in the prior art.

[0006] To solve the above technical problems, according to one aspect of an embodiment of the present invention, a refrigerator defrost control method is provided, comprising: detecting whether the heat exchange efficiency of the refrigerator evaporator is reduced; when the heat exchange efficiency of the evaporator is reduced, further detecting the operating parameters of the refrigerator; judging whether the operating parameters of the refrigerator belong to a preset parameter range; wherein the preset parameter range is used to characterize that the operating parameters of the refrigerator will not cause the heat exchange efficiency of the evaporator to be reduced; when the operating parameters of the refrigerator belong to the preset operating range, controlling the refrigerator to defrost.

[0007] Furthermore, the detection of whether the heat exchange efficiency of the refrigerator evaporator is reduced includes: detecting the temperature difference between the inlet and outlet of the refrigerator evaporator; obtaining the volume of the refrigerator, and determining a preset temperature difference threshold value according to the volume of the refrigerator; judging whether the inlet and outlet temperature difference of the evaporator is less than the preset temperature difference threshold value; when the inlet and outlet temperature difference of the evaporator is less than the preset temperature difference threshold value, determining that the heat exchange efficiency of the evaporator is reduced, otherwise, determining that the heat exchange efficiency of the evaporator is not reduced.

[0008] Furthermore, the preset temperature difference threshold is determined according to the volume of the refrigerator, including: obtaining a corresponding relationship between the frost thickness of the evaporator, the volume of the refrigerator, and the temperature difference between the inlet and outlet of the evaporator; obtaining a preset frost thickness threshold; substituting the volume of the refrigerator and the preset frost thickness threshold into the corresponding relationship, and calculating to determine the preset temperature difference threshold.

[0009] Further, the operating parameters of the refrigerator include at least one of the following: the door opening time of the refrigerator, the fan speed, and the compressor speed; judging whether the operating parameters of the refrigerator belong to the preset parameter range, including: calculating the cumulative door opening time of the refrigerator according to the door opening time of the refrigerator, and judging whether the cumulative door opening time is less than the preset time; calculating the average fan speed according to the fan speed, and judging whether the average fan speed is greater than a first preset speed; calculating the average compressor speed according to the compressor speed, and judging whether the average compressor speed is greater than a second preset speed; when the cumulative door opening time is less than the preset time, and / or the average fan speed is greater than the first preset speed, and / or the average compressor speed is greater than the second preset speed, it is determined that the operating parameters of the refrigerator belong to the preset parameter range.

[0010] Furthermore, before determining whether the operating parameters of the refrigerator fall within a preset parameter range, it also includes: detecting again whether the heat exchange efficiency of the evaporator of the refrigerator is reduced; when the heat exchange efficiency of the evaporator is reduced, triggering the determination of whether the operating parameters of the refrigerator fall within the preset parameter range; when the heat exchange efficiency of the evaporator is not reduced, triggering the detection of whether the heat exchange efficiency of the evaporator of the refrigerator is reduced after a preset time.

[0011] Furthermore, the method further includes: when the operating parameters of the refrigerator do not belong to the preset operating range, counting the cumulative number of times the operating parameters of the refrigerator do not belong to the preset operating range; and controlling the refrigerator to defrost according to the cumulative number.

[0012] Further, controlling the refrigerator to defrost according to the accumulated number of times includes: determining whether the accumulated number of times reaches a preset maximum number of times; if so, controlling the refrigerator to defrost, otherwise, continuing to detect operating parameters of the refrigerator.

[0013] According to another aspect of an embodiment of the present invention, a refrigerator defrost control device is provided, comprising: a first detection module, used to detect whether the heat exchange efficiency of the refrigerator's evaporator is reduced; a second detection module, used to further detect the operating parameters of the refrigerator when the heat exchange efficiency of the evaporator is reduced; a judgment module, used to judge whether the operating parameters of the refrigerator belong to a preset parameter range; wherein the preset parameter range is used to characterize that the operating parameters of the refrigerator will not cause the heat exchange efficiency of the evaporator to be reduced; and a control module, used to control the refrigerator to defrost when the operating parameters of the refrigerator belong to the preset operating range.

[0014] According to another aspect of the embodiments of the present invention, a refrigerator is provided, comprising the above-mentioned refrigerator defrost control device.

[0015] According to another aspect of an embodiment of the present invention, there is provided a storage medium containing computer executable instructions, wherein the computer executable instructions are used to execute the above-mentioned refrigerator defrosting control method when executed by a computer processor.

[0016] In the present invention, a defrosting control scheme for a refrigerator is provided. When it is detected that the heat exchange efficiency of the evaporator is reduced, the operating parameters of the refrigerator are further detected to determine whether the operating parameters of the refrigerator belong to the preset parameter range, so as to exclude the situation where the heat exchange efficiency of the evaporator is reduced due to the operating parameters of the refrigerator. When the operating parameters of the refrigerator do not cause the heat exchange efficiency of the evaporator to be reduced, it means that the evaporator is frosted thickly, resulting in reduced heat exchange efficiency of the evaporator. At this time, the defrosting conditions are met, and the refrigerator needs to be controlled to defrost, so as to perform defrosting in time. The above scheme can accurately and timely determine the timing of defrosting, avoid the problems of low heat exchange efficiency and power consumption caused by frosting in the refrigerator, achieve energy saving effect, and at the same time ensure the normal operation of the refrigerator, and improve the refrigeration effect and operation stability of the refrigerator. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 is an optional flow chart of a refrigerator defrosting control method according to an embodiment of the present invention;

[0018] Figure 2 is another optional flow chart of the refrigerator defrosting control method according to an embodiment of the present invention;

[0019] Figure 3 This is an optional structural block diagram of a refrigerator defrosting control device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0021] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings, and "multiple" generally includes at least two.

[0022] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0023] It should be understood that although the terms first, second, third, etc. may be used to describe controllers in embodiments of the present invention, these controllers should not be limited to these terms. These terms are only used to distinguish controllers connected to different devices. For example, without departing from the scope of embodiments of the present invention, a first controller may also be referred to as a second controller, and similarly, a second controller may also be referred to as a first controller.

[0024] As used herein, the words "if" and "if" may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0025] It should also be noted that the term "includes", "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, so that a commodity or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such commodity or device. In the absence of more restrictions, the elements defined by the sentence "comprising a ..." do not exclude the existence of other identical elements in the commodity or device including the elements.

[0026] The optional embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0027] Example 1

[0028] In a preferred embodiment 1 of the present invention, a refrigerator defrosting control method is provided, and the control method can be directly applied to various refrigerators. When it is specifically implemented, it can be achieved by installing software, APP in the refrigerator, or writing a corresponding program into the device controller.

[0029] Specifically, Figure 1 An optional flow chart of the method is shown as follows: Figure 1 As shown, the method includes the following steps S102-S108:

[0030] S102: Detect whether the heat exchange efficiency of the refrigerator evaporator is reduced;

[0031] S104: When the heat exchange efficiency of the evaporator decreases, further detecting the operating parameters of the refrigerator;

[0032] S106: Determine whether the operating parameters of the refrigerator are within a preset parameter range; wherein the preset parameter range is used to indicate that the operating parameters of the refrigerator will not cause a decrease in the heat exchange efficiency of the evaporator;

[0033] S108: When the operating parameters of the refrigerator are within a preset operating range, controlling the refrigerator to defrost.

[0034] In the above embodiment, a defrosting control scheme for a refrigerator is provided. When it is detected that the heat exchange efficiency of the evaporator is reduced, the operating parameters of the refrigerator are further detected to determine whether the operating parameters of the refrigerator belong to the preset parameter range, so as to exclude the situation where the heat exchange efficiency of the evaporator is reduced due to the operating parameters of the refrigerator. When the operating parameters of the refrigerator do not cause the heat exchange efficiency of the evaporator to be reduced, it means that the evaporator is frosted thickly, resulting in reduced heat exchange efficiency of the evaporator. At this time, the defrosting conditions are met, and the refrigerator needs to be controlled to defrost, so as to defrost in time. The above scheme can accurately and timely determine the timing of defrosting, avoid the problem of low heat exchange efficiency and power consumption caused by frosting in the refrigerator, achieve energy saving effect, and at the same time ensure the normal operation of the refrigerator, and improve the refrigeration effect and operation stability of the refrigerator.

[0035] In a preferred embodiment of the present invention, detecting whether the heat exchange efficiency of the evaporator of the refrigerator is reduced includes: detecting the temperature difference between the inlet and outlet of the evaporator of the refrigerator; obtaining the volume of the refrigerator, and determining a preset temperature difference threshold value according to the volume of the refrigerator; judging whether the inlet and outlet temperature difference of the evaporator is less than the preset temperature difference threshold value; when the inlet and outlet temperature difference of the evaporator is less than the preset temperature difference threshold value, determining that the heat exchange efficiency of the evaporator is reduced, otherwise, determining that the heat exchange efficiency of the evaporator is not reduced.

[0036] When the refrigerator is operating normally, the compressor compresses the refrigerant to make it a high-pressure gaseous refrigerant. In this process, the pressure and temperature of the refrigerant will rise significantly, which allows it to absorb heat from the refrigerator and transfer it to the environment outside the refrigerator. Then, the refrigerant that has undergone the above heat exchange enters the condenser, then enters the throttling device, and finally returns to the compressor at low temperature and low pressure. However, when frost forms inside the refrigerator, since frost is a poor conductor of heat, it will form an insulating layer, which reduces the effective heat exchange area on the evaporator surface and hinders the heat exchange between the air in the refrigerator and the refrigerant in the evaporator. This will cause the refrigerant leaving the evaporator to not undergo sufficient heat exchange, and the temperature of the refrigerant flowing out of the evaporator will not change much compared to the temperature when the refrigerant enters the evaporator, resulting in a decrease in the temperature difference between the evaporator inlet and outlet. The thicker the frost layer condensed inside the refrigerator, the greater the impact on the heat exchange between the air inside the refrigerator and the refrigerant in the evaporator, and the smaller the temperature difference between the evaporator inlet and outlet. It can be seen that there is a certain correspondence between the difference between the inlet and outlet temperatures of the evaporator and the thickness of the frost in the refrigerator. The heat exchange efficiency of the evaporator can be accurately judged by the temperature difference between the inlet and outlet of the evaporator, and then the frosting situation can be determined.

[0037] Considering that the volume V of the refrigerator has a great influence on the correspondence between the temperature difference ΔT at the inlet and outlet of the evaporator and the frost thickness D, in the above embodiment, the preset temperature difference threshold is determined according to the volume of the refrigerator, including: obtaining the correspondence between the frost thickness of the evaporator and the volume of the refrigerator and the temperature difference at the inlet and outlet of the evaporator; obtaining the preset frost thickness threshold; substituting the volume of the refrigerator and the preset frost thickness threshold into the correspondence formula, and calculating to determine the preset temperature difference threshold. That is, the correspondence between the temperature difference at the inlet and outlet of the evaporator and the frost thickness is different for different refrigerator volumes, so the volume of the refrigerator is introduced into the judgment step of the temperature difference at the inlet and outlet of the evaporator, and the preset temperature difference threshold corresponding to the frost thickness of refrigerators of different volumes is accurately judged, so that the defrosting judgment of refrigerators of different volumes is more accurate.

[0038] The corresponding relationship between the frost thickness of the evaporator and the volume of the refrigerator and the temperature difference between the inlet and outlet of the evaporator can be determined in the following way: Take a group of ten refrigerators with no obvious differences except for the different volumes. After the refrigerator is powered on, the temperature difference ΔT between the inlet and outlet of the evaporator and the thickness D of the frost on the refrigerator are detected at regular intervals. After obtaining a large amount of data, the data set is trained through the artificial intelligence network structure to establish a mathematical model of the corresponding relationship between the temperature difference ΔT between the inlet and outlet of the evaporator and the frost thickness with the volume added as a reference variable: D = f (V, ΔT), and then this model is used to determine the preset temperature difference threshold. Frost thickness and volume will affect heat exchange, thereby affecting the inlet and outlet temperature difference of the evaporator. After the volume is determined, the corresponding relationship between the frost thickness and the inlet and outlet temperature difference of the evaporator is determined. The smaller the inlet and outlet temperature difference of the evaporator, the less sufficient the heat exchange is at this time, and the thicker the frost thickness is.

[0039] When the heat exchange efficiency of the evaporator is reduced, it indicates that the heat exchange is insufficient, which may be caused by the frost being too thick, or it may be caused by changes in the actual operating conditions of the door opening and closing, the refrigeration fan and the compressor. Therefore, the operating parameters of the refrigerator are detected to determine whether the operating parameters of the refrigerator belong to the preset parameter range; wherein the preset parameter range is used to characterize that the operating parameters of the refrigerator will not cause the heat exchange efficiency of the evaporator to be reduced. Further, the operating parameters of the refrigerator include at least one of the following: the door opening time of the refrigerator, the fan speed, and the compressor speed; determining whether the operating parameters of the refrigerator belong to the preset parameter range, including: calculating the cumulative door opening time of the refrigerator according to the door opening time of the refrigerator, and determining whether the cumulative door opening time is less than the preset time; calculating the average fan speed according to the fan speed, and determining whether the average fan speed is greater than the first preset speed; calculating the average compressor speed according to the compressor speed, and determining whether the average compressor speed is greater than the second preset speed; when the cumulative door opening time is less than the preset time, and / or the average fan speed is greater than the first preset speed, and / or the average compressor speed is greater than the second preset speed, it is determined that the operating parameters of the refrigerator belong to the preset parameter range. That is, the cumulative door opening time, average fan speed, and average compressor speed of the refrigerator will affect the heat exchange efficiency. The above detection and judgment steps can be used to rule out whether the heat exchange efficiency is reduced due to the operation of the refrigerator itself, so as to accurately determine the defrosting timing.

[0040] After the difference ΔT is detected to be lower than the threshold, the door opening condition and the average speed of the fan and compressor in the next time period T are detected. The reason why the detection is performed in the next cycle after the difference ΔT is lower than the threshold instead of in each time period T is to reduce the number of detections and save resources, and to check whether the condition below the threshold can be eliminated naturally in the next cycle. If so, no processing is required, which can also save resources.

[0041] That is, before judging whether the operating parameters of the refrigerator are within the preset parameter range, it also includes: detecting again whether the heat exchange efficiency of the refrigerator's evaporator is reduced; when the heat exchange efficiency of the evaporator is reduced, triggering the judgment of whether the operating parameters of the refrigerator are within the preset parameter range; when the heat exchange efficiency of the evaporator is not reduced, triggering the detection of whether the heat exchange efficiency of the refrigerator's evaporator is reduced after the preset time. Check whether the situation below the threshold value in this cycle has been naturally eliminated. If the situation below the threshold value in this cycle has been naturally eliminated, start the frost monitoring of a new cycle. If the situation below the threshold value in this cycle has not been naturally eliminated, execute the judgment step again, that is, judge whether the operating parameters of the refrigerator are within the preset parameter range. Excluding the above three factors that have the main impact on the reduction of heat exchange efficiency, it is judged that the frost is too thick at this time, which has become the main factor causing the reduction of heat exchange efficiency, so defrosting is performed.

[0042] In addition, when the operating parameters of the refrigerator do not fall within the preset operating range, the cumulative number of times the operating parameters of the refrigerator do not fall within the preset operating range is counted; the refrigerator is controlled to defrost according to the cumulative number of times. When the operating parameters of the refrigerator do not fall within the preset operating range, it means that the operating parameters of the refrigerator will cause the heat exchange efficiency of the evaporator to decrease, so the cumulative number of times is counted to monitor the operation of the refrigerator.

[0043] Further, the refrigerator is controlled to defrost according to the accumulated times, including: judging whether the accumulated times reach the preset maximum times; if so, controlling the refrigerator to defrost, otherwise, continuing to detect the operating parameters of the refrigerator. At this time, the influence of the door opening condition, the average speed of the fan and the compressor cannot be eliminated, and the longest non-defrosting time is exceeded, and defrosting must be performed to ensure the normal operation of the refrigerator.

[0044] The prior art for determining the defrost time of a refrigerator does not take into account the impact of the refrigerator volume, door opening and closing, actual operation of the compressor and refrigeration fan on the changes in the outlet and inlet temperatures of the evaporator, resulting in misjudgment.

[0045] In the present invention, the refrigerator control system accurately determines whether to perform automatic defrosting based on the changes in the refrigerator volume, the temperature difference between the evaporator inlet and outlet, and the actual operation of the refrigerator door, compressor and refrigeration fan.

[0046] Another refrigerator defrosting control method is also provided in the preferred embodiment 1 of the present invention. Specifically, Figure 2 An optional flow chart of the method is shown in FIG. Figure 2 As shown, the method includes the following steps S201-S212:

[0047] S201: Input refrigerator volume V; Turn on the refrigerator and set the refrigerator volume V on the refrigerator control panel;

[0048] S202: According to D=f(V, ΔT), determine the temperature difference threshold corresponding to the frost thickness threshold of the defrost node; according to the corresponding relationship data model D=f(V, ΔT) between the evaporator inlet and outlet temperature difference ΔT and the frost thickness D with the volume V added as a reference variable, obtain the temperature difference threshold between the evaporator inlet and outlet temperatures corresponding to the frost thickness threshold of the predetermined defrost node;

[0049] S203: After a time T has passed, the inlet and outlet temperatures of the evaporator are detected, and the temperature difference ΔT is calculated; after a time T has passed, the refrigerator control system starts the temperature sensor to monitor the inlet and outlet temperatures of the evaporator, and calculates the temperature difference ΔT of the inlet and outlet of the evaporator;

[0050] S204: Is the temperature difference ΔT lower than the threshold? If so, proceed to step S205; otherwise, proceed to step S203; the refrigerator control system compares the calculated temperature difference ΔT between the inlet and outlet of the evaporator with the temperature difference threshold. If it is lower than the threshold (indicating that the heat exchange is insufficient, which may be caused by the frost being too thick, or by the door opening and closing, the refrigeration fan and the actual operation of the compressor), then proceed to step S205; otherwise, proceed to step S203;

[0051] S205: Detect and calculate the cumulative door opening time T_open, the average speed of the refrigeration fan V_ave1 and the average speed of the compressor V_ave2 in the subsequent time T; Detect and calculate the cumulative door opening time T_open, the average speed of the refrigeration fan V_ave1 and the average speed of the compressor V_ave2 in the subsequent time T (after the detection difference ΔT is lower than the threshold, the door opening situation in the next time period T, the average speed of the fan and the compressor. The reason why the detection difference ΔT is lower than the threshold in the next cycle instead of each time cycle T is to reduce the number of detections and save resources; second, to check whether the situation below the threshold in the next cycle can be eliminated naturally. If so, no processing is required, which can also save resources;

[0052] S206: Detect the evaporator inlet and outlet temperatures again and calculate the temperature difference ΔT1; the refrigerator control system starts the temperature sensor again to monitor the evaporator inlet and outlet temperatures and calculates the evaporator inlet and outlet temperature difference ΔT1 (check whether the situation below the threshold value in this cycle has been naturally eliminated);

[0053] S207: Is the temperature difference ΔT1 lower than the threshold? If so, proceed to step S208; otherwise, proceed to step S203; the refrigerator control system compares the calculated temperature difference ΔT1 between the inlet and outlet of the evaporator with the temperature difference threshold again. If it is still lower than the threshold (the situation lower than the threshold has not been eliminated naturally in this cycle), then proceed to step S208; otherwise, then proceed to step S203 (the situation lower than the threshold has been eliminated naturally in this cycle, and a new cycle of frost monitoring begins);

[0054] S208: Whether the accumulated door opening time T_open, the average speed of the refrigeration fan V_ave1 and the average speed of the compressor V_ave2 are all within the corresponding threshold range, if yes, proceed to step S209, otherwise, proceed to step S210; determine whether the accumulated door opening time T_open, the average speed of the refrigeration fan V_ave1 and the average speed of the compressor V_ave2 detected within this cycle time T are all within the corresponding threshold range, if yes (the above three factors are excluded as the main influence on the decrease in heat exchange efficiency, and it is determined that the frost is too thick at this time, which becomes the main factor causing the decrease in heat exchange efficiency);

[0055] S209: Automatically defrost until it is completed; the refrigerator control system automatically defrosts, and after defrosting is completed, step 203 is then executed;

[0056] S210: n plus 1; counting the number of continuous cycles in which the door is opened, the average speed of the refrigeration fan and the compressor is not within the corresponding threshold range, and n plus 1;

[0057] S211: Whether n is greater than the threshold value N, if yes, proceed to step S212, otherwise proceed to step S205; determine whether n is greater than the threshold value N, if yes (the influence of the door opening condition, the average speed of the fan and the compressor cannot be eliminated, the longest non-defrosting time has been exceeded, and defrosting must be performed), then proceed to step S212, otherwise, then proceed to step S205 (continue to monitor the door opening condition, the average speed of the fan and the compressor);

[0058] S212:n is cleared.

[0059] The prior art for determining the defrost time of a refrigerator does not take into account the impact of the refrigerator volume, door opening and closing, actual operation of the compressor and refrigeration fan on the changes in the outlet and inlet temperatures of the evaporator, resulting in misjudgment.

[0060] In the present invention, the refrigerator control system accurately determines whether to perform automatic defrosting based on the changes in the refrigerator volume, the temperature difference between the evaporator inlet and outlet, and the actual operation of the refrigerator door, compressor and refrigeration fan.

[0061] Through the above implementation, the timing of automatic defrosting is accurately determined, and the purpose of energy saving is achieved while satisfying the user's refrigeration requirements.

[0062] Example 2

[0063] Based on the refrigerator defrosting control method provided in the above embodiment 1, a refrigerator defrosting control device is further provided in a preferred embodiment 2 of the present invention. Specifically, Figure 3 An optional structural block diagram of the device is shown, such as Figure 3 As shown, the device comprises:

[0064] The first detection module 302 is used to detect whether the heat exchange efficiency of the evaporator of the refrigerator is reduced;

[0065] The second detection module 304 is connected to the first detection module 302 and is used to further detect the operating parameters of the refrigerator when the heat exchange efficiency of the evaporator is reduced;

[0066] The judgment module 306 is connected to the second detection module 304 and is used to judge whether the operating parameters of the refrigerator belong to a preset parameter range; wherein the preset parameter range is used to indicate that the operating parameters of the refrigerator will not cause the heat exchange efficiency of the evaporator to decrease;

[0067] The control module 308 is connected to the judgment module 306, and is used to control the refrigerator to defrost when the operating parameters of the refrigerator are within a preset operating range.

[0068] In the above embodiment, a defrosting control scheme for a refrigerator is provided. When it is detected that the heat exchange efficiency of the evaporator is reduced, the operating parameters of the refrigerator are further detected to determine whether the operating parameters of the refrigerator belong to the preset parameter range, so as to exclude the situation where the heat exchange efficiency of the evaporator is reduced due to the operating parameters of the refrigerator. When the operating parameters of the refrigerator do not cause the heat exchange efficiency of the evaporator to be reduced, it means that the evaporator is frosted thickly, resulting in reduced heat exchange efficiency of the evaporator. At this time, the defrosting conditions are met, and the refrigerator needs to be controlled to defrost, so as to defrost in time. The above scheme can accurately and timely determine the timing of defrosting, avoid the problem of low heat exchange efficiency and power consumption caused by frosting in the refrigerator, achieve energy saving effect, and at the same time ensure the normal operation of the refrigerator, and improve the refrigeration effect and operation stability of the refrigerator.

[0069] The first detection module 302 includes: a detection unit, which is used to detect the temperature difference between the inlet and outlet of the refrigerator evaporator; an acquisition unit, which is used to obtain the volume of the refrigerator and determine the preset temperature difference threshold value according to the volume of the refrigerator; a first judgment unit, which is used to judge whether the temperature difference between the inlet and outlet of the evaporator is less than the preset temperature difference threshold value; a first determination unit, which is used to determine that the heat exchange efficiency of the evaporator is reduced when the temperature difference between the inlet and outlet of the evaporator is less than the preset temperature difference threshold value, otherwise, determine that the heat exchange efficiency of the evaporator is not reduced.

[0070] The acquisition unit includes: a first acquisition subunit, which is used to obtain the corresponding relationship between the frost thickness of the evaporator, the volume of the refrigerator and the temperature difference between the inlet and outlet of the evaporator; a second acquisition subunit, which is used to obtain a preset frost thickness threshold; and a calculation subunit, which is used to substitute the volume of the refrigerator and the preset frost thickness threshold into the corresponding relationship formula to calculate and determine the preset temperature difference threshold.

[0071] The operating parameters of the refrigerator include at least one of the following: the door opening time of the refrigerator, the fan speed, and the compressor speed. The judgment module 306 includes: a second judgment unit, which is used to calculate the cumulative door opening time of the refrigerator according to the door opening time of the refrigerator, and judge whether the cumulative door opening time is less than the preset time; calculate the average fan speed according to the fan speed, and judge whether the average fan speed is greater than the first preset speed; calculate the average compressor speed according to the compressor speed, and judge whether the average compressor speed is greater than the second preset speed; a second determination unit, which is used to determine that the operating parameters of the refrigerator belong to the preset parameter range when the cumulative door opening time is less than the preset time, and / or the average fan speed is greater than the first preset speed, and / or the average compressor speed is greater than the second preset speed.

[0072] The judgment module 306 also includes: a detection unit, which is used to detect again whether the heat exchange efficiency of the evaporator of the refrigerator is reduced before determining whether the operating parameters of the refrigerator belong to the preset parameter range; a first trigger unit, which is used to trigger the judgment of whether the operating parameters of the refrigerator belong to the preset parameter range when the evaporator heat exchange efficiency is reduced; and a second trigger unit, which is used to trigger the detection of whether the heat exchange efficiency of the evaporator of the refrigerator is reduced after a preset time when the evaporator heat exchange efficiency is not reduced.

[0073] The device also includes: a statistical module, which is used to count the cumulative number of times the operating parameters of the refrigerator do not fall within the preset operating range when the operating parameters of the refrigerator do not fall within the preset operating range; and a defrost mode, which is used to control the refrigerator to defrost according to the cumulative number of times.

[0074] Furthermore, the defrost mode includes: determining whether the accumulated number of times reaches a preset maximum number of times; if so, controlling the refrigerator to defrost, otherwise, continuing to detect the operating parameters of the refrigerator.

[0075] Regarding the device in the above embodiment, the specific manner in which each unit and module performs operations has been described in detail in the embodiment of the method, and will not be elaborated here.

[0076] Example 3

[0077] Based on the refrigerator defrost control device provided in the above-mentioned embodiment 2, a refrigerator is further provided in a preferred embodiment 3 of the present invention, comprising the refrigerator defrost control device as described above.

[0078] In the above embodiment, a defrosting control scheme for a refrigerator is provided. When it is detected that the heat exchange efficiency of the evaporator is reduced, the operating parameters of the refrigerator are further detected to determine whether the operating parameters of the refrigerator belong to the preset parameter range, so as to exclude the situation where the heat exchange efficiency of the evaporator is reduced due to the operating parameters of the refrigerator. When the operating parameters of the refrigerator do not cause the heat exchange efficiency of the evaporator to be reduced, it means that the evaporator is frosted thickly, resulting in reduced heat exchange efficiency of the evaporator. At this time, the defrosting conditions are met, and the refrigerator needs to be controlled to defrost, so as to defrost in time. The above scheme can accurately and timely determine the timing of defrosting, avoid the problem of low heat exchange efficiency and power consumption caused by frosting in the refrigerator, achieve energy saving effect, and at the same time ensure the normal operation of the refrigerator, and improve the refrigeration effect and operation stability of the refrigerator.

[0079] Example 4

[0080] Based on the refrigerator defrost control method provided in the above embodiment 1, a storage medium containing computer executable instructions is also provided in a preferred embodiment 4 of the present invention. When the computer executable instructions are executed by a computer processor, they are used to execute the refrigerator defrost control method as described above.

[0081] In the above embodiment, a defrosting control scheme for a refrigerator is provided. When it is detected that the heat exchange efficiency of the evaporator is reduced, the operating parameters of the refrigerator are further detected to determine whether the operating parameters of the refrigerator belong to the preset parameter range, so as to exclude the situation where the heat exchange efficiency of the evaporator is reduced due to the operating parameters of the refrigerator. When the operating parameters of the refrigerator do not cause the heat exchange efficiency of the evaporator to be reduced, it means that the evaporator is frosted thickly, resulting in reduced heat exchange efficiency of the evaporator. At this time, the defrosting conditions are met, and the refrigerator needs to be controlled to defrost, so as to defrost in time. The above scheme can accurately and timely determine the timing of defrosting, avoid the problem of low heat exchange efficiency and power consumption caused by frosting in the refrigerator, achieve energy saving effect, and at the same time ensure the normal operation of the refrigerator, and improve the refrigeration effect and operation stability of the refrigerator.

[0082] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0083] In the above embodiments of the present invention, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0084] In the several embodiments provided in this application, it should be understood that the disclosed technical content can be implemented in other ways. Among them, the device embodiments described above are only schematic. For example, the division of the units can be a logical function division. There may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of units or modules, which can be electrical or other forms.

[0085] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple units. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0086] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0087] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), mobile hard disk, magnetic disk or optical disk and other media that can store program codes.

[0088] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not invented by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0089] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A refrigerator defrosting control method, characterized in that: include: Check whether the heat exchange efficiency of the refrigerator's evaporator is reduced; When the heat exchange efficiency of the evaporator decreases, further detecting the operating parameters of the refrigerator; Determining whether the operating parameters of the refrigerator fall within a preset parameter range; wherein the preset parameter range is used to indicate that the operating parameters of the refrigerator will not cause a decrease in the heat exchange efficiency of the evaporator; When the operating parameters of the refrigerator are within the preset operating range, the refrigerator is controlled to defrost.

2. The method according to claim 1, characterized in that The detecting whether the heat exchange efficiency of the evaporator of the refrigerator is reduced comprises: Detecting the temperature difference between the inlet and outlet of the evaporator of the refrigerator; Acquiring the volume of the refrigerator, and determining a preset temperature difference threshold according to the volume of the refrigerator; Determine whether the inlet and outlet temperature difference of the evaporator is less than the preset temperature difference threshold; When the inlet and outlet temperature difference of the evaporator is less than the preset temperature difference threshold, it is determined that the heat exchange efficiency of the evaporator is reduced; otherwise, it is determined that the heat exchange efficiency of the evaporator is not reduced.

3. The method according to claim 2, characterized in that Determining a preset temperature difference threshold according to the volume of the refrigerator includes: Obtaining a corresponding relationship between the frost thickness of the evaporator, the volume of the refrigerator, and the temperature difference between the inlet and outlet of the evaporator; Get the preset frost thickness threshold; The volume of the refrigerator and the preset frost thickness threshold are substituted into the corresponding relationship formula to calculate and determine the preset temperature difference threshold.

4. The method according to claim 1, characterized in that: The operating parameters of the refrigerator include at least one of the following: the door opening time, the fan speed, and the compressor speed of the refrigerator; judging whether the operating parameters of the refrigerator are within the preset parameter range includes: Calculating the cumulative door opening time of the refrigerator according to the door opening time of the refrigerator, and determining whether the cumulative door opening time is less than a preset time; Calculating an average fan speed according to the fan speed, and determining whether the average fan speed is greater than a first preset speed; Calculating an average speed of the compressor according to the compressor speed, and determining whether the average speed of the compressor is greater than a second preset speed; When the accumulated door opening time is less than the preset time, and / or the average fan speed is greater than the first preset speed, and / or the average compressor speed is greater than the second preset speed, it is determined that the operating parameters of the refrigerator belong to the preset parameter range.

5. The method according to claim 1, characterized in that Before determining whether the operating parameters of the refrigerator are within the preset parameter range, the method further includes: detecting again whether the heat exchange efficiency of the evaporator of the refrigerator is reduced; When the heat exchange efficiency of the evaporator decreases, the step of determining whether the operating parameters of the refrigerator are within a preset parameter range is triggered; When the heat exchange efficiency of the evaporator is not reduced, the detection of whether the heat exchange efficiency of the evaporator of the refrigerator is reduced is triggered after a preset time.

6. The method according to claim 1, characterized in that Also includes: When the operating parameter of the refrigerator does not belong to the preset operating range, counting the cumulative number of times the operating parameter of the refrigerator does not belong to the preset operating range; The refrigerator is controlled to defrost according to the accumulated number of times.

7. The method according to claim 6, characterized in that Controlling the refrigerator to defrost according to the accumulated number of times includes: Determine whether the accumulated number of times reaches a preset maximum number of times; If yes, control the refrigerator to defrost, otherwise, continue to detect the operating parameters of the refrigerator.

8. A refrigerator defrosting control device, characterized in that: include: The first detection module is used to detect whether the heat exchange efficiency of the refrigerator evaporator is reduced; A second detection module, used for further detecting the operating parameters of the refrigerator when the heat exchange efficiency of the evaporator is reduced; A judgment module, used to judge whether the operating parameters of the refrigerator belong to a preset parameter range; wherein the preset parameter range is used to indicate that the operating parameters of the refrigerator will not cause a decrease in the heat exchange efficiency of the evaporator; The control module is used to control the refrigerator to defrost when the operating parameters of the refrigerator fall within the preset operating range.

9. A refrigerator, characterized in that: It comprises the refrigerator defrost control device as claimed in claim 8.

10. A storage medium containing computer executable instructions, characterized in that: The computer executable instructions are used to execute the refrigerator defrosting control method according to any one of claims 1 to 7 when executed by a computer processor.

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