Refrigerator, defrost control method thereof, and readable storage medium

Abstract

The present invention belongs to the technical field of refrigerator defrost control, and specifically relates to a refrigerator, a defrost control method thereof, and a readable storage medium. The defrost control method includes: obtaining a detection result of the amount of frost on the evaporator by an ultrasonic sensor; if the detection result meets a first preset condition, defrosting the evaporator; if the detection result meets a second preset condition, an abnormality exists in the ultrasonic sensor; and when the abnormality exists in the ultrasonic sensor, periodically defrosting the evaporator. The technical solution provided by the present invention can solve the problem of poor reliability of refrigerator defrost control in the prior art, thereby achieving the purpose of improving refrigerator operating performance.

Description

Technical Field

[0001] The present invention relates to the technical field of defrost control of refrigerators, and in particular to a refrigerator, a defrost control method thereof, and a readable storage medium. Background Art

[0002] Refrigerators are common household appliances, often used to store and preserve food. Food (such as vegetables and fruits) often contains a certain amount of moisture, which evaporates inside the refrigerator, causing frost to form on the evaporator. This frost can affect the evaporator's proper function. Therefore, to ensure proper operation of the refrigerator, defrosting the evaporator is necessary when it frosts.

[0003] At present, when defrosting a refrigerator, a commonly used method is to set a temperature sensor to detect the temperature of the evaporator. When the temperature of the evaporator is lower than the preset temperature value, it is considered that the evaporator is in a frosted state and the evaporator is defrosted. However, the temperature sensor can only detect the temperature of some positions and cannot reflect the overall frosting state of the evaporator. Therefore, the effect of this defrosting method is not ideal.

[0004] To improve the reliability of evaporator defrosting, conventional technologies use ultrasonic sensors to detect the evaporator surface to determine the amount of frost on the evaporator surface. When the frost reaches a preset level, defrosting is initiated. However, this control method relies on the ultrasonic sensor. If the ultrasonic sensor malfunctions, defrosting of the evaporator cannot be performed, resulting in poor reliability. Summary of the Invention

[0005] In view of the above problems, the present invention is proposed to provide a refrigerator and its defrost control method, and a readable storage medium that overcome the above problems or at least partially solve the above problems, which can solve the problem of poor reliability of refrigerator defrost processing in the prior art and achieve the purpose of improving the working performance of the refrigerator.

[0006] Specifically, the present invention provides a defrost control method for a refrigerator, wherein the refrigerator is provided with an ultrasonic sensor for detecting the amount of frost on an evaporator; the defrost control method comprises:

[0007] Obtaining a detection result of the ultrasonic sensor on the amount of frost on the evaporator;

[0008] If the detection result meets the first preset condition, defrosting the evaporator;

[0009] If the detection result meets the second preset condition, then the ultrasonic sensor is abnormal;

[0010] When the ultrasonic sensor is abnormal, the evaporator is periodically defrosted.

[0011] According to an embodiment of the present invention, the first preset condition includes: the amount of frost is greater than a first preset amount of frost and the duration is greater than a first preset duration.

[0012] According to one embodiment of the present invention, when the ultrasonic sensor is normal and the evaporator is defrosted, if the amount of frost is less than a second preset amount and the duration is longer than a second preset duration, the defrost is stopped.

[0013] According to one embodiment of the present invention, the second preset condition includes: the frosting amount is greater than a third preset frosting amount or less than the first preset frosting amount, and the duration is greater than the third preset duration.

[0014] According to one embodiment of the present invention, when the ultrasonic sensor is abnormal, if it is detected that the amount of frost is greater than a first preset amount of frost and the duration is greater than the first preset duration, or the amount of frost is less than a second preset amount of frost and the duration is greater than the second preset duration, the ultrasonic sensor returns to normal.

[0015] According to an embodiment of the present invention, the second preset condition includes: a plurality of consecutive fluctuations of the frosting amount obtained are smaller than a preset fluctuation.

[0016] According to one embodiment of the present invention, when the ultrasonic sensor is abnormal, if a plurality of consecutive fluctuations of the frost amount are greater than the preset fluctuation, the ultrasonic sensor returns to normal.

[0017] According to one embodiment of the present invention, obtaining the detection result of the amount of frost on the evaporator by the ultrasonic sensor includes:

[0018] The ultrasonic sensor is controlled to operate intermittently, and a detection signal of the ultrasonic sensor is obtained during each operation, and the amount of frost on the evaporator is obtained according to the detection signal.

[0019] A refrigerator includes a processor and a memory, wherein the memory stores a computer program for execution on the processor, and when the processor executes the computer program, the refrigerator defrost control method as described in any one of the above embodiments is implemented.

[0020] A computer-readable storage medium stores an executable computer program, wherein the computer program is used to be executed on a processor to implement the refrigerator defrost control method as described in any one of the above embodiments.

[0021] The technical solution provided in the present application can not only defrost the evaporator according to the signal detected by the ultrasonic sensor, but also determine whether there is an abnormality in the ultrasonic sensor according to the signal detected by the ultrasonic sensor, and can also defrost the evaporator when there is an abnormality in the ultrasonic sensor. Therefore, it can solve the problem that the evaporator cannot be defrosted due to a failure of the ultrasonic sensor, thereby improving the reliability of defrosting the evaporator.

[0022] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 is a flow chart of a defrost control method for a refrigerator according to one embodiment of the present invention;

[0025] Figure 2 is a flow chart for determining whether the amount of frost on the evaporator meets a first preset condition according to one embodiment of the present invention;

[0026] Figure 3 is a flowchart of determining whether to stop the defrost process according to one embodiment of the present invention;

[0027] Figure 4 is a flowchart for determining whether a detection result of an ultrasonic sensor meets a second preset condition according to an embodiment of the present invention;

[0028] Figure 5 is a flow chart showing whether an ultrasonic sensor has returned to normal according to an embodiment of the present invention;

[0029] Figure 6 is a flowchart of determining whether the detection result of the ultrasonic sensor meets the second preset condition according to another embodiment of the present invention.

[0030] Figure 7 This is a flowchart showing whether the ultrasonic sensor returns to normal according to another embodiment of the present invention. DETAILED DESCRIPTION

[0031] In the description of the present embodiment, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "example," "specific example," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0032] See also Figure 1 , Figure 1 The flowchart of the defrost control method of the refrigerator of the present application is shown, wherein an ultrasonic sensor is provided in the refrigerator, and the ultrasonic sensor is installed in front of or behind the evaporator, and can detect the evaporator to obtain the amount of frost on the evaporator, thereby facilitating the defrost process of the evaporator. Figure 1 The process shown is a detailed introduction to the defrost control method of the refrigerator of the present application.

[0033] like Figure 1 As shown, the defrost control method of the refrigerator of the present application includes the following steps:

[0034] Step S1: Obtaining the detection result of the ultrasonic sensor on the amount of frost on the evaporator. In this embodiment, the ultrasonic sensor can detect the distance between its position and the evaporator, and obtain the amount of frost on the evaporator based on the distance, specifically including:

[0035] First, the distance L0 between the ultrasonic sensor and the evaporator when there is no frost on the evaporator is obtained. This distance L0 can be obtained by manual measurement and input into the refrigerator, or it can be obtained by obtaining the detection signal of the ultrasonic sensor when there is no ice on the evaporator and used as the reference distance;

[0036] Then, during the operation of the refrigerator, the ultrasonic sensor detects the results and obtains the distance L1 between the ultrasonic sensor and the frosted evaporator. Since the evaporator is frosted, the distance L1 detected by the ultrasonic sensor is the distance between the ultrasonic sensor and the side of the frosted area away from the evaporator.

[0037] Finally, the distance L0 is subtracted from the distance L1 to obtain the amount of frost a on the evaporator. That is, in step 1, the amount of frost on the evaporator obtained by the ultrasonic sensor is a=L0-L1.

[0038] Step S2: Determine whether the above detection result meets the first preset condition or the second preset condition;

[0039] If the above detection result meets the first preset condition, the evaporator is defrosted;

[0040] If the above detection result meets the second preset condition, it is determined that there is an abnormality in the ultrasonic sensor.

[0041] In this embodiment, the above-mentioned first preset condition is a condition for determining whether to perform defrost treatment on the evaporator. For example, the above-mentioned first preset condition may be that the frost amount a of the evaporator is greater than the preset frost amount threshold value, that is, when the frost amount of the evaporator is greater than the preset frost amount threshold value, it can be considered that the frost amount a of the evaporator is too large, and therefore the evaporator needs to be defrosted.

[0042] The above-mentioned second preset condition is a judgment condition for whether there is an abnormality in the ultrasonic sensor. Since the distance between the ultrasonic sensor and the evaporator is fixed, the amount of frost on the evaporator detected by the ultrasonic sensor is also within a certain thickness range. Therefore, the second preset condition may be that the detected amount of frost on the evaporator is not within the preset thickness range. That is, when the detected amount of frost on the evaporator is not within the preset thickness range, it is judged that there is an abnormality in the ultrasonic sensor, and the fault code is displayed on the display panel of the refrigerator to remind the user.

[0043] Step S3: When the ultrasonic sensor is abnormal, the evaporator is periodically defrosted.

[0044] In this embodiment, performing periodic defrosting on the evaporator includes:

[0045] First, obtain the preset cycle time and the preset defrost time;

[0046] Then, when the refrigerator is running, the evaporator is defrosted once every preset cycle time, and the duration of each defrost process is the preset defrost time.

[0047] For example, the preset cycle duration may be 10 hours, and the preset defrost duration may be 30 minutes. Therefore, the refrigerator performs a defrost process on the evaporator every 10 hours of operation, and each defrost process lasts 30 minutes.

[0048] In this embodiment, a defrost heating wire is provided at the evaporator, and the defrost heating wire can be an electric heating wire. The method for defrosting the evaporator includes: controlling the defrost heating wire to start working to increase the temperature of the evaporator, and controlling the compressor and the refrigeration fan of the refrigerator to stop working to prevent the temperature of the evaporator from decreasing, thereby improving the reliability of the defrost treatment of the evaporator.

[0049] To sum up, the technical solution provided in this embodiment can not only defrost the evaporator according to the signal detected by the ultrasonic sensor, but also determine whether there is an abnormality in the ultrasonic sensor according to the signal detected by the ultrasonic sensor, and when there is an abnormality in the ultrasonic sensor, the evaporator can also be defrosted. Therefore, it can solve the problem that the evaporator cannot be defrosted due to a failure of the ultrasonic sensor, thereby improving the reliability of defrosting the evaporator.

[0050] The technical solution of the present application has been introduced in detail above. The technical solution of the present application will be further introduced below in combination with multiple embodiments. It can be understood that the defrost control method of the refrigerator described in the following embodiments is illustrative rather than restrictive, and can be adjusted and modified accordingly according to the actual scenario.

[0051] In one embodiment, the first preset condition includes: the amount of frost on the evaporator is greater than the first preset amount of frost, and the duration is greater than the first preset duration. The first preset amount of frost can be set to a1, and the first preset duration can be set according to needs, for example, it can be set to 10 minutes. In this embodiment, it can be set as follows: Figure 2 The method shown is used to determine whether the amount of frost on the evaporator meets the first preset condition:

[0052] Step S11: obtaining the amount of frost a on the evaporator according to the detection signal of the ultrasonic sensor;

[0053] Step S12: Determine whether the frost amount a of the evaporator is greater than a first preset frost amount a1. If so, start timing. During the timing process:

[0054] Step S13: If the frost amount a of any evaporator is not greater than the first preset frost amount a1, stop timing and reset the timing result to zero;

[0055] Step S14: If the timing result reaches 10 minutes, it is determined that the amount of frost on the evaporator meets the first preset condition, and the evaporator needs to be defrosted.

[0056] During the operation of the refrigerator, the frost amount a on the evaporator may be greater than the first preset frost amount a2, but the frost melts in a short time and is less than the first preset frost amount a1. In this case, if the defrost process is controlled only based on whether the frost amount a on the evaporator is greater than the first preset frost amount a1, frequent defrosting will occur, affecting the working performance of the refrigerator.

[0057] The setting method of this embodiment uses the duration that the frost amount a on the evaporator is greater than the first preset frost amount a1 as a judgment condition for starting the defrost process. Compared with the control method that only judges whether to start the defrost process based on whether the frost amount a on the evaporator is greater than the first preset frost amount a1, the frequency of the evaporator defrost process can be reduced and the working performance of the refrigerator can be improved.

[0058] Furthermore, in one embodiment, when the ultrasonic sensor is in a normal state, during the process of processing the evaporator, if the frost amount a of the evaporator is less than the second preset frost amount and the duration is longer than the second preset time, the defrosting process is stopped. The second preset frost amount can be set as a2+b, and the second preset time is 3 minutes, where a2 is a preset value and b is an adjustment parameter. In this embodiment, the following can be used: Figure 3 The method shown is used to determine whether to stop the defrost process:

[0059] Step S21: When the ultrasonic sensor is normal, during the defrosting process of the evaporator, the amount of frost a of the evaporator is obtained by the ultrasonic sensor;

[0060] Step S22: Determine whether the frost amount a of the evaporator is less than the second preset frost amount a2+b. If so, start timing, and during the timing process:

[0061] Step S23: If the frost amount a on the evaporator is greater than the second preset frost amount a2+b, then stop timing and reset the timing result to zero;

[0062] Step S24: If the timing reaches the second preset time, the defrosting process for the evaporator is stopped.

[0063] In this embodiment, stopping the defrosting process on the evaporator includes: stopping the operation of the defrosting heating wire to stop heating the evaporator, controlling the compressor to enter the working state and the refrigeration fan to standby, so as to control the refrigerator to enter the refrigeration working mode.

[0064] The setting method of this embodiment stops defrosting the evaporator when the amount of frost on the evaporator is less than the second preset amount and the duration reaches the second preset duration, which can ensure that the evaporator is fully defrosted and improve the reliability of the defrost treatment of the evaporator.

[0065] The above describes in detail the defrosting process of the evaporator under normal conditions using the ultrasonic sensor in the technical solution of this application. Below, in combination with specific embodiments, a detailed introduction is given to the abnormality judgment method of the ultrasonic sensor and the defrosting process of the evaporator when the ultrasonic sensor is abnormal.

[0066] In one embodiment, the second preset condition includes: the amount of frost on the evaporator is greater than the third preset amount or less than the fourth preset amount, and the duration is greater than the third preset time. For example, the third preset amount of frost can be set to a1+b, the fourth preset amount of frost can be set to a2-b, and the third preset time can be 5 minutes. Accordingly, in this embodiment, the following can be adopted: Figure 4 The method shown determines whether the detection result of the ultrasonic sensor meets the second preset condition:

[0067] Step S31: obtaining the frost amount a of the evaporator according to the detection result of the ultrasonic sensor;

[0068] Step S32: determining whether the frost amount a of the evaporator is greater than a third preset frost amount a1+b or less than a fourth preset frost amount a2-b;

[0069] Step S33: If the frost amount a of the evaporator is greater than the third preset frost amount a1+b or less than the fourth preset frost amount a2-b, then start timing, and during the timing process:

[0070] Step S34: If the frost amount a of the evaporator is continuously greater than the third preset frost amount a1+b or less than the fourth preset frost amount a2-b, then the timing is stopped and the timing result is reset to zero;

[0071] Step S35: If the timed duration reaches the third preset duration, it is determined that the detection result of the ultrasonic sensor meets the second preset condition, and at this time, there is an abnormality in the ultrasonic sensor.

[0072] Through the configuration of this embodiment, it is possible to accurately and quickly determine whether the ultrasonic sensor has an abnormality based on the detection result of the ultrasonic sensor, thereby improving the efficiency and accuracy of determining abnormalities of the ultrasonic sensor.

[0073] Furthermore, in one embodiment, when an abnormality occurs in the ultrasonic sensor, the ultrasonic sensor can be Figure 5 The method shown is used to determine whether the ultrasonic sensor has returned to normal:

[0074] Step S41: obtaining the frost amount a of the evaporator according to the detection result of the frost amount of the evaporator by the ultrasonic sensor;

[0075] Step S42: determining whether the obtained frost amount a of the evaporator is greater than a first preset frost amount a1 or less than a second preset frost amount a2-b;

[0076] Step S43: If the frost amount a of the evaporator is greater than the first preset frost amount a1 or less than the second preset frost amount a2-b, then start timing. During the timing process:

[0077] Step S44: If the frost amount a of the evaporator is continuously greater than the first preset frost amount a1 and the duration is longer than the first preset duration, or is continuously less than the second preset frost amount a2-b and the duration is longer than the second preset duration, the ultrasonic sensor returns to normal;

[0078] Otherwise, the ultrasonic sensor is still abnormal.

[0079] In another embodiment, the second preset condition includes: a plurality of consecutive fluctuations in the obtained frost amount being less than a preset fluctuation. In this embodiment, the plurality of consecutive frost amounts may be five consecutive frost amounts, i.e., the frost amount of five consecutive evaporators is obtained by five consecutive detection information from the ultrasonic sensor, and whether the ultrasonic sensor is abnormal is determined based on the fluctuations in the frost amount of the five consecutive evaporators.

[0080] In this embodiment, the following can be used Figure 6 The method shown determines whether the detection result of the ultrasonic sensor meets the second preset condition:

[0081] Step S51: Acquire five consecutive detection information of the ultrasonic sensor, and obtain the frost amount of the corresponding evaporator according to each detection information, thereby obtaining the frost amount of five consecutive evaporators;

[0082] Step S52: Obtain fluctuations in the amount of frost on the five consecutive evaporators.

[0083] In this embodiment, the maximum value of the frost amount of 5 consecutive evaporators is assumed to be a. max , the minimum value is a min , the average value is a mid , then in this embodiment, the fluctuation of the frost amount of 5 consecutive evaporators can be a max -a mid / a mid .

[0084] In other embodiments, the fluctuation can be calculated in other ways, for example, it can be a mid -a min / a mid .

[0085] Step S53: Determine whether the fluctuation of the frost amount of the above five consecutive evaporators is less than the preset fluctuation. If so, it is determined that the detection result of the ultrasonic sensor meets the second preset condition, that is, the ultrasonic sensor is abnormal. Otherwise, the detection result of the ultrasonic sensor does not meet the second preset condition, that is, the ultrasonic sensor is not abnormal.

[0086] Since the detection results of the ultrasonic sensor may fluctuate greatly when an abnormality occurs, the configuration of this embodiment can accurately determine whether an abnormality exists in the ultrasonic sensor by detecting fluctuations in the amount of frost on the evaporator.

[0087] Furthermore, in one embodiment, when the ultrasonic sensor is abnormal, if a plurality of consecutive fluctuations in the amount of frost on the ultrasonic sensor are greater than the preset fluctuation, the ultrasonic sensor returns to normal.

[0088] In this embodiment, the above-mentioned multiple consecutive frost amounts can be 5 consecutive frost amounts, that is, the frost amounts of 5 consecutive evaporators are obtained through 5 consecutive detection information of the ultrasonic sensor, and whether the ultrasonic sensor has an abnormality is judged based on the fluctuation of the frost amounts of 5 consecutive evaporators.

[0089] In this embodiment, the following can be used Figure 7 The method shown is to determine whether the ultrasonic sensor has returned to normal:

[0090] Step S61: Acquire five consecutive detection information of the ultrasonic sensor, and obtain the frost amount of the corresponding evaporator according to each detection information, thereby obtaining the frost amount of five consecutive evaporators;

[0091] Step S62: Obtaining fluctuations in the amount of frost on the five consecutive evaporators, and determining whether the fluctuations in the amount of frost on the five consecutive evaporators are less than a preset fluctuation;

[0092] Step S63: If it is not less than, the ultrasonic sensor returns to normal; otherwise, the ultrasonic sensor is still in an abnormal state.

[0093] In one embodiment, the step S1 above acquires the detection result of the amount of frost on the evaporator by the ultrasonic sensor, including:

[0094] The ultrasonic sensor is controlled to operate intermittently, and a detection signal of the ultrasonic sensor is obtained during each operation, and the amount of frost on the evaporator is obtained according to the detection signal.

[0095] In this embodiment, the above-mentioned control of the ultrasonic sensor to operate intermittently includes: controlling the ultrasonic sensor to operate once at intervals of the fourth preset time length, and the duration of each operation of the ultrasonic sensor is the fifth time length, wherein the above-mentioned fourth preset time length can be 2 hours, and the fifth time length can be 12 minutes, that is, controlling the ultrasonic sensor to operate once every 2 hours, each time for 12 minutes, and obtaining the detection signal of the ultrasonic sensor during each operation to obtain the amount of frost on the evaporator.

[0096] The configuration of this embodiment controls the intermittent operation of the ultrasonic sensor, which can reduce the operating frequency of the ultrasonic sensor, thereby increasing the service life of the ultrasonic sensor and saving the operating cost of the refrigerator.

[0097] The present invention also provides a refrigerator, which includes an evaporator and an ultrasonic sensor for detecting the amount of frost on the evaporator, as well as a processor, a memory, a communication interface and a communication bus, wherein the processor, the memory and the communication interface communicate with each other via the communication bus. The processor is used to provide computing and control capabilities. The memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and computer program instructions. The internal memory provides an environment for the operation of the operating system and computer program instructions in the non-volatile storage medium. The communication interface of the above-mentioned device is used to communicate with an external terminal in a wired or wireless manner, and the wireless manner can be achieved through WIFI, an operator network, NFC (near field communication) or other technologies. The air conditioner provided in this embodiment has a memory for storing computer program instructions, which, when executed by the processor, can implement multiple embodiments of the defrost control method of the above-mentioned refrigerator.

[0098] The present invention also provides a computer-readable storage medium. Personnel of ordinary skill in the art will appreciate that all or part of the processes in the above-mentioned refrigerator defrost control method embodiment can be implemented by instructing related hardware through computer program instructions, and the above-mentioned computer program instructions can be stored in a non-volatile computer-readable storage medium. When the computer program instructions are executed, they may include the processes of the above-mentioned method embodiments. Among them, any reference to memory, storage, database or other media used in the various embodiments provided by the present invention may include non-volatile and / or volatile memory. Non-volatile memory may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM) or flash memory. Volatile memory may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDRSDRAM), enhanced SDRAM (ESDRAM), Synchronous Link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), etc.

[0099] At this point, those skilled in the art will recognize that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention may be directly determined or derived from the disclosure of the present invention without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A defrost control method for a refrigerator, wherein the refrigerator is provided with an ultrasonic sensor for detecting the amount of frost on the evaporator; characterized in that: The defrost control method comprises: Obtaining a detection result of the ultrasonic sensor on the amount of frost on the evaporator; If the detection result meets the first preset condition, defrosting the evaporator; If the detection result meets the second preset condition, then the ultrasonic sensor is abnormal; When the ultrasonic sensor is abnormal, the evaporator is periodically defrosted; The first preset condition includes: the amount of frost is greater than a first preset amount of frost and the duration is greater than a first preset duration; The second preset condition includes: a plurality of consecutive fluctuations in the frosting amount are smaller than a preset fluctuation.

2. The defrost control method for a refrigerator according to claim 1, characterized in that: When the ultrasonic sensor is normal and the evaporator is defrosted, if the amount of frost is less than a second preset amount and the duration of the frost is greater than a second preset duration, the defrost is stopped.

3. The defrost control method for a refrigerator according to claim 1, wherein: When the ultrasonic sensor is abnormal, if a plurality of consecutive fluctuations of the frost amount are greater than the preset fluctuation, the ultrasonic sensor returns to normal.

4. The defrost control method for a refrigerator according to claim 1, characterized in that: The obtaining of the detection result of the ultrasonic sensor on the amount of frost on the evaporator includes: The ultrasonic sensor is controlled to operate intermittently, and a detection signal of the ultrasonic sensor is obtained during each operation, and the amount of frost on the evaporator is obtained according to the detection signal.

5. A refrigerator, characterized in that: The device comprises an evaporator and an ultrasonic sensor for detecting the amount of frost on the evaporator, a processor and a memory; The memory stores a computer program for execution on the processor. When the processor executes the computer program, the defrost control method for the refrigerator according to any one of claims 1 to 4 is implemented.

6. A computer-readable storage medium, characterized in that The device stores an executable computer program, which is used to be executed on a processor to implement the defrost control method for a refrigerator according to any one of claims 1 to 4.

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