WO2021213388A1 - Defrosting control method based on temperature, and defrosting apparatus and refrigerator - Google Patents

Abstract

Disclosed are a defrosting control method based on temperature, and a defrosting apparatus and a refrigerator. The defrosting control method based on temperature comprises: acquiring an event of placing a defrosted object into a defrosting chamber of a defrosting apparatus; starting an infrared temperature sensing device of the defrosting apparatus, and acquiring an initial temperature field distribution, which is obtained by means of monitoring the infrared temperature sensing device, in the defrosting chamber, wherein a temperature sensing area of the infrared temperature sensing device is pre-divided into a preset number of grids; determining, according to the initial temperature field distribution, a grid in which the defrosted object is located; controlling the defrosting apparatus to start defrosting; identifying the lowest temperature value of the grid in which the defrosted object is located; and determining whether the lowest temperature value is greater than a first preset threshold value, and if so, executing a defrosting completion determination process. By means of the method of the present invention, a determination process can be pre-executed before the end of defrosting, and a defrosting temperature is taken as the basis for determining the completion of defrosting, such that insufficient defrosting or excessive defrosting can be effectively prevented, and the defrosting quality is improved.

Description

Temperature-based thawing control method, thawing device and refrigerator Technical field

The invention relates to household appliances, in particular to a temperature-based thawing control method, a thawing device and a refrigerator.

Background technique

Frozen food needs to be thawed before being processed or eaten. The traditional thawing method generally uses a heating device to heat the frozen food. However, the thawing process of the heating device is prone to overheating, which affects the subsequent processing of the food and even causes the loss of food nutrition.

Devices dedicated to thawing have gradually appeared in the prior art, such as radio frequency and microwave technology for thawing. These thawing equipment are improved for heating means, but most of the thawing control methods are still adjusted according to time, for example, timing end thawing. Although some thawing devices can also set the thawing time according to the weight of the thawed object, or adjust the thawing power according to the thawing time, which improves the flexibility of the thawing control to a certain extent, these thawing equipment still cannot guarantee the precise control of the thawing process. Therefore, the problem of insufficient thawing or excessive thawing is prone to occur. Therefore, the prior art lacks technical means to solve the problem of judging the completion of thawing.

Summary of the invention

An object of the present invention is to provide a temperature-based thawing control method, thawing device and refrigerator that at least partially solve any of the above technical problems.

A further object of the present invention is to accurately determine the completion of thawing and avoid insufficient thawing and excessive thawing.

Another further object of the present invention is to improve the accuracy of thawing control.

In particular, the present invention provides a temperature-based thawing control method. The thawing control method includes: acquiring the event that the thawing cavity of the thawing device is put into the thawed object; activating the infrared temperature sensing device of the thawing device, and acquiring the infrared temperature sensing device The detected initial temperature field distribution in the thawing chamber, the temperature sensing area of the infrared temperature sensing device is divided into a preset number of grids in advance; the grid where the thawed object is located is determined according to the initial temperature field distribution; the thawing device is controlled to turn on the thawing; Identify the lowest temperature value of the grid where the thawed object is located; determine whether the lowest temperature value is greater than the first preset threshold, and if so, execute the thawing completion judging process.

Optionally, the step of determining the grid where the thawed object in the thawing device is located according to the initial temperature field distribution includes: determining the initial temperature value of each grid according to the initial temperature field distribution; and placing the initial temperature value at a preset preset thawing temperature The grid within the range is used as the grid where the thawed object is located.

Optionally, the thawing completion judgment process includes: continuously acquiring the temperature field distribution in the thawing cavity detected by the infrared temperature sensing device; determining the temperature value of the grid where each thawed object is located according to the temperature field distribution in the thawing cavity; The temperature value of the grid where the object is located determines the thawing temperature of the thawed object; it is determined whether the thawing temperature is greater than or equal to the second preset threshold, if so, the thawing is determined to be completed and the thawing device is controlled to stop thawing, and the second preset threshold is greater than the first preset Threshold.

Optionally, the step of determining the thawing temperature of the thawed object according to the temperature value of the grid where the thawed object is located includes: selecting a reference grid from the grid where the thawed object is located according to the temperature value of the grid where the thawed object is located, and setting the reference grid The average or median temperature of the grid is used as the thawing temperature.

Optionally, the step of selecting a reference grid from the grid where the thawed object is located according to the temperature value of the grid where the thawed object is located includes: selecting the lowest temperature grid from the grid where the thawed object is located, and determining The grid adjacent to the lowest temperature grid; from the grids adjacent to the lowest temperature grid, select the grid with the lowest temperature difference within the set temperature difference threshold from the grid adjacent to the lowest temperature grid, and select the selected grid and the lowest The warm grid serves as the reference grid.

Optionally, when the thawing temperature is less than the second preset threshold value, the method further includes: reducing the thawing power of the thawing device according to the thawing temperature.

Optionally, when the thawing temperature is less than the second preset threshold, the method further includes: determining whether the highest temperature value in the grid where the thawed object is located is greater than the third preset threshold, and if so, controlling the thawing device to suspend the thawing for a set time period .

Optionally, the event that the thawing chamber is put into the thawed object includes: the event that the door of the thawing device is closed; and/or the operating interface of the thawing device receives the thawing trigger signal input by the user; and/or the item of the thawing device The detector detects that an item is placed in the thawing cavity.

According to another aspect of the present invention, a thawing device is also provided. The thawing device includes: an infrared temperature sensing device configured to detect the temperature field distribution of the thawing cavity of the thawing device, and the temperature sensing area of the infrared temperature sensing device is divided into a preset number of grids in advance; a control device, which includes a memory And a processor, a control program is stored in the memory, and when the control program is executed by the processor, it is used to implement any one of the above-mentioned temperature-based thawing control methods.

According to another aspect of the present invention, a refrigerator is also provided. The refrigerator includes: a box body defining at least one accommodating space therein; a thawing device arranged in the accommodating space, and the thawing device is the above-mentioned thawing device.

The temperature-based thawing control method of the present invention uses an infrared temperature sensing device capable of detecting temperature field distribution as the detection device, and divides the temperature sensing area of the infrared temperature sensing device into a preset number of grids in advance, according to the infrared temperature sensing device Determine the temperature value of each grid and determine the grid where the thawed object is located. After the thawing device is turned on, the lowest temperature value in the grid where the thawed object is located is used as the judgment basis. In the case of a preset threshold, the process of determining the completion of thawing is executed to provide an accurate basis for the thawing device to determine the completion of thawing.

The temperature-based thawing control method of the present invention executes the judgment process in advance before the end of thawing, and uses the thawing temperature as the basis for determining the completion of thawing, which can effectively avoid insufficient or excessive thawing and improve the quality of thawing.

Further, the temperature-based thawing control method of the present invention searches for the lowest temperature grid with the lowest temperature value from the grid where the thawed object is located, determines the grid adjacent to the lowest temperature grid, and selects the reference grid from the grid ; This selection method can determine the detection area that can reflect the temperature state of the thawed object, so that a temperature value that is more in line with the requirements of the thawing control judgment basis can be obtained.

Still further, the temperature-based thawing control method of the present invention can be applied to a refrigerator provided with a thawing device, which enriches the functions of the refrigerator and improves the convenience of users of the refrigerator.

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 better understand the above and other objectives, advantages and features of the present invention.

Description of the drawings

Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary but not restrictive manner with reference to the accompanying drawings. The same reference numerals in the drawings indicate the same or similar components or parts. Those skilled in the art should understand that these drawings are not necessarily drawn to scale. In the attached picture:

Fig. 1 is a schematic structural diagram of a thawing device according to an embodiment of the present invention;

Figure 2 is a schematic block diagram of a thawing device according to an embodiment of the present invention;

Fig. 3 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention;

FIG. 4 is a schematic diagram of the temperature sensing area where the infrared temperature sensing device is divided into grids in the temperature-based thawing control method according to an embodiment of the present invention;

Fig. 5 is a schematic diagram of a temperature-based thawing control method according to an embodiment of the present invention;

Fig. 6 is a schematic diagram of a process for determining the completion of thawing in a temperature-based thawing control method according to an embodiment of the present invention; and

Fig. 7 is a schematic diagram of a specific application example of a temperature-based thawing control method according to an embodiment of the present invention.

Detailed ways

Fig. 1 is a schematic structural diagram of a thawing device 200 according to an embodiment of the present invention. Fig. 2 is a schematic block diagram of a thawing device 200 according to an embodiment of the present invention. The thawing device 200 of this embodiment may generally include: a housing 201, an infrared temperature sensing device 210, and a control device 220. A thawing cavity 202 is formed in the housing 201 to prevent thawed objects. In order to facilitate the illustration of the internal structure, the door of the thawing device 200 is not shown in FIG. 1. The thawing device 200 may use radio frequency thawing, microwave thawing, and heating thawing methods to defrost the thawed objects placed in the thawing cavity 202. For example, for radio frequency thawing, a radio frequency plate can be arranged in the thawing cavity 202, and the radio frequency plate can be used to output a radio frequency signal to achieve thawing; for another example, a microwave thawing can be achieved by outputting a microwave signal from a magnetron. Since the thawing component of the thawing device 200 is well known to those skilled in the art, it will not be further described here.

The infrared temperature sensing device 210 is configured to continuously detect the temperature field distribution of the thawing cavity 202 of the thawing device 200. The infrared temperature sensing device 210 can put the thawed object in the thawing cavity 202 and continuously detect the temperature field distribution of the thawing cavity 202 during the thawing process. That is, the infrared temperature sensing device 210 can detect the temperature field in the temperature sensing area 211, similar to the sensing method of forming an infrared image, to obtain the temperature of each position of the temperature sensing area 211. In this embodiment, the temperature sensing area 211 of the infrared temperature sensing device 210 may be divided into a preset number of grids in advance. The infrared temperature sensing device 210 may be arranged on the top of the thawing cavity 202, so as to divide the thawing cavity 202 into a grid from a top angle. Those skilled in the art can install the infrared temperature sensing device 210 on each cavity wall of the thawing cavity 202 as needed. The temperature sensing lens of the infrared temperature sensing device 210 can be sensed through the opening of the housing 201.

The control device 220 may generally include: a memory 222 and a processor 221, wherein the memory 222 stores a control program 223, and the control program 223 is used to implement the temperature-based thawing control method of this embodiment when the control program 223 is executed by the processor 221. The processor 221 may be a central processing unit (central processing unit, CPU for short), or a digital processing unit (Digital Signal Processing, DSP), or the like. The memory 222 is used to store a program executed by the processor 221. The memory 222 is any medium that can be used to carry or store desired program codes in the form of instructions or data structures and can be accessed by a computer, and can also be a combination of multiple memories. The aforementioned control program 223 may be downloaded from a computer-readable storage medium to a corresponding computing/processing device or downloaded and installed to the defrosting device 200 via a network (for example, the Internet, a local area network, a wide area network, and/or a wireless network).

FIG. 3 is a schematic structural diagram of a refrigerator 10 according to an embodiment of the present invention, in which all outer doors of the refrigerator 10 are removed to show the compartment structure in the cabinet 100 of the refrigerator 10. The refrigerator 10 may generally include a box body 100 that defines at least one accommodating space, a compartment door for opening and closing the access ports of each accommodating space, and a thawing device 200 arranged in one accommodating space. In the illustrated embodiment, the number of the thawing device 200 is one.

In some embodiments, the number of accommodating spaces of the refrigerator 10 may be three. Specifically, the refrigerator 10 may include a box body 100 defining a refrigerating compartment 110, a temperature-changing compartment 120, and a freezing compartment 130, and a refrigerator for opening and closing the refrigerating compartment 110, the temperature-changing compartment 120, and the freezing compartment 130, respectively. Door body, variable temperature door body and freezer door body. The thawing device 200 may be installed in the temperature-variable compartment 120. The thawing device 200 can be fixed in the temperature-variable compartment 120 by interference fit or clamping with the inner walls of the two vertical sides of the temperature-variable compartment 120. The thawing switch can be set on the variable temperature door.

In addition, as known to those skilled in the art, the refrigerating compartment 110 refers to a storage compartment with a storage temperature of 0～+8°C for food materials; the freezer compartment 130 refers to a storage temperature for food materials ranging from -20～ -15℃ storage compartment; variable temperature compartment 120 refers to a storage room whose storage temperature can be changed in a large range (for example, the adjustment range can be above 4℃ and can be adjusted to above 0℃ or below 0℃) In general, the storage temperature of the room can span refrigeration, soft freezing (generally -4 to 0°C) and freezing temperature, preferably -16 to +4°C.

In some embodiments, the refrigerator 10 according to the present invention may be an air-cooled refrigerator, and uses an evaporator of a compression refrigeration system as a cold source. Since the air-cooled refrigerator and its refrigeration system are well known to those skilled in the art, they will not be described in detail in this embodiment.

The thawing device 200 of this embodiment may preferably adopt a radio frequency thawing method, which is more suitable for the refrigerator 10, enriches the functions of the refrigerator 10, and improves the convenience of the refrigerator users.

FIG. 4 is a schematic diagram of the temperature sensing area 211 divided into grids by the infrared temperature sensing device 210 in the thawing device 200 according to an embodiment of the present invention. For ease of description, the grid of the temperature-sensitive area 211 in FIG. 4 uses the sequence numbers of its rows and columns as coordinates. For example, (X1, Y1) refers to the grid in the first row and first column, (X2, Y1) refers to the grid in the second row and first column, and so on. That is to say, the temperature sensing area 211 of the infrared temperature sensing device 210 forms a grid similar to a matrix. By detecting the temperature of each grid, the temperature at different positions of the thawing cavity 202 can be determined. The method of this embodiment can accurately determine the position of the thawed object through the grid-based temperature detection method. The size of the specific grid and the number of divisions can be configured according to the temperature sensing requirements and the performance of the infrared temperature sensing device 210. The division method in FIG. 4 is only an example, and those skilled in the art can adjust it as needed.

When the infrared temperature sensing device 210 is used to detect the temperature value, in order to avoid fluctuations in the data of one temperature sampling, an accurate temperature can be obtained by processing multiple sampling values. The infrared temperature sensing device 210 is configured to continuously detect the temperature field distribution of the thawing cavity according to a preset sampling period. The step of determining the temperature value of each grid according to the temperature field distribution may include: selecting the temperature field distribution of the thawing cavity of a continuously set number of sampling points; extracting each grid separately from the temperature field distribution of the thawing cavity of each sampling point The temperature sampling value of each grid is obtained, and the temperature sampling value sequence of each grid is calculated to obtain the temperature value of each grid. The infrared temperature sensing device 210 can set a sampling period according to its own detection capability, for example, at a frequency of 2 to 10 times per second, to continuously collect the temperature of multiple points. The above-mentioned sampling point specifically refers to the measurement time when the temperature measurement is performed.

The step of determining the temperature value of each grid is by filtering the extreme value (such as the maximum and/or minimum) from the temperature sampling value sequence of each grid, and taking the temperature sampling value sequence of each grid to filter out The average or median value of the remaining temperature sampling values after the extreme value is used as the temperature value of the corresponding grid, which avoids sampling errors. For example, for the grid of (X5, Y4), the temperature of 10 consecutive collection points are: -18.2 degrees, -18.4 degrees -, -18.6 degrees, -18.3 degrees, -18.3 degrees, -17.9 degrees, -18 degrees, -18.1 Degrees, -18.1 degrees, -18.2 degrees, remove the two extreme values (maximum and minimum), calculate the average value as -18.2 degrees, then the temperature value of the grid of (X5, Y4) obtained by this measurement can be determined It is -18.2 degrees.

Detect the grids shown in Figure 4 in turn, and get the temperature values of each grid as shown in Table 1:

Table 1

To	Y1	Y2	Y3	Y4	Y5	Y6	Y7	Y8
X1	2.2	2.1	2.2	2.2	2.5	2.3	2.1	2.1
X2	2.4	2.1	2.3	2.1	2	2.1	2.3	2.3
X3	2.2	2.1	2.3	2.3	2	2	2.1	2.4
X4	2.3	-8.9	-9.8	-10.3	-9.6	-7.2	2.1	2.1
X5	2.2	-7.3	-17.2	-18.2	-17.9	-9.3	2.3	2.4
X6	2.3	-6.5	-17.3	-17.5	-17.3	-8.7	2.1	2.4
X7	2.1	-6.9	-7.5	-8.1	-8.3	-7.9	2.3	2.4
X8	2.1	2.2	2.2	2.3	2.4	2.2	2.2	2.4

Through the above-mentioned processing of the sampled value, the detection accuracy of the infrared temperature sensing device 210 is improved, and the influence of the sampling error on the detection result is reduced.

The thawing device 200 of this embodiment uses the infrared temperature sensing device 210 to detect the temperature of the thawed object, and improves the temperature processing method, can accurately determine the grid where the thawed object is located, and the detection result is accurate for the subsequent thawing control of the thawing device 200 Provide an accurate basis. The thawing device 200 of this embodiment will be further introduced below in conjunction with the description of the temperature-based thawing control method of this embodiment.

Fig. 5 is a schematic diagram of a temperature-based thawing control method according to an embodiment of the present invention. The temperature-based thawing control method may generally include:

Step S502: Obtain an event that the thawing cavity 202 of the thawing device 200 is put into a thawed object. The event of putting the thawed object reflects the presence of an unfreezing target in the defrosting chamber 202, which may specifically include the event that the door of the thawing device 200 is closed, that is, detecting the action of closing the door after the user puts the thawed object. Or, the operating interface of the thawing device 200 receives the thawing trigger signal input by the user, that is, the user indicates that the thawing device 200 has been placed in the thawing object through a thawing switch or other control device. Or the article detector of the thawing device 200 detects that the article is placed in the thawing cavity 202. The article detector may be a weighing device, a radio frequency generating device that detects the inserted article through the change of the dielectric constant in the thawing cavity 202, or an image recognition device that determines the thawed article to be put in through image recognition, or the like. In some embodiments, the thawing device 200 may integrate one or more of the above methods to detect the put thawed object. After it is determined that the thawing cavity 202 is placed in the thawed object, the infrared temperature sensing device 210 of the thawing device 200 is activated, and the temperature of the thawing cavity 202 is detected.

In step S504, the infrared temperature sensing device 210 of the thawing device 200 is started, and the initial temperature field distribution in the thawing cavity 202 detected by the infrared temperature sensing device 210 is obtained. The initial temperature field distribution reflects the temperature state in the thawing cavity after the thawed material is put in and before the thawing is started.

Step S506: Determine the grid where the thawed object is located according to the initial temperature field distribution; for example, determine the initial temperature value of each grid according to the initial temperature field distribution; use the grid with the initial temperature value within the preset thawing temperature range as The grid where the thawed object is located. The above-mentioned initial temperature value can be obtained by the above-mentioned calculation of the sampling value sequence, for example, the initial temperature field distribution of a set number of consecutive sampling points is selected; the initial temperature field distribution of each sampling point is extracted separately from the initial temperature field distribution of each grid Temperature sampling value, the initial temperature sampling value sequence of each grid is obtained, and the temperature value of each grid is calculated through the initial temperature sampling value sequence of each grid. By filtering the extreme values (such as the maximum and/or minimum) from the initial temperature sampling value sequence of each grid, the remaining temperature sampling value after filtering the extreme values in the initial temperature sampling value sequence of each grid is taken The average or median value of is used as the temperature value of the corresponding grid, which avoids sampling errors.

The actual temperature of the thawed object is generally below the freezing point, which is significantly different from the temperature of other areas in the thawing cavity 202. Those skilled in the art can set a preset thawing temperature range according to the freezing point temperature of the thawed object to determine the location of the thawed object in the thawing device 200 Grid. Using the example temperature shown in Table 1, it can be determined that the X5,Y3), (X5,Y4), (X5,Y5), (X5,Y6), (X6,Y3), (X6,Y4), (X6,Y5), (X6,Y6), (X7, The area 410 composed of Y3), (X7, Y4), (X7, Y5), and (X7, Y6) is the area where the thawed object is located.

Further, a reference grid may be selected from the grid where the thawed object is located according to the temperature value of the grid where the thawed object is located, and the temperature average or median value of the reference grid is used as the thawing temperature. For example, according to the rule, the grid corresponding to the lowest temperature point of -18.2 degrees is (X5, Y4), and the adjacent coordinates are: (X4, Y3), (X4, Y4), (X4, Y5), (X5, Y3) , (X5, Y5), (X6, Y3), (X6, Y4), (X6, Y5), and the area of the area 420 in FIG. 4 are the lowest temperature grid of the thawed object and the area where the reference grid is located. If the set temperature difference threshold is set to 2 degrees, the grids whose absolute value of the temperature difference is less than 2 include (X5, Y3), (X5, Y5), (X6, Y3), (X6, Y4), (X6,, It is obtained that the thawing temperature of the thawed object is -17.6° C. Those skilled in the art can set and set the temperature difference threshold according to needs, and generally the temperature difference threshold can be set between plus or minus 3 to 0.

In step S508, the thawing device 200 is controlled to start thawing, that is, the radio frequency thawing module or other thawing modules are activated to start thawing the thawed object;

Step S510: Identify the lowest temperature value of the grid where the thawed object is located, that is, compare the temperature values of the grid where the thawed object is located to determine the lowest temperature value. The lowest temperature value reflects the degree of thawing at the position where the frozen material is most difficult to thawed during the thawing process

In step S512, it is judged whether the minimum temperature value is greater than the first preset threshold value, and if so, the thawing completion judging process is executed. The value range of the first preset threshold may be between -6 degrees Celsius and -4 degrees Celsius. Therefore, when the thawed object is close to the completion of thawing, the determination of the completion of thawing is started. Therefore, the judgment process is executed in advance before the end of thawing, and the thawing temperature is used as the basis for judging the completion of thawing, which can effectively avoid insufficient thawing or excessive thawing, and improve the quality of thawing.

Fig. 6 is a schematic diagram of a thawing completion determination process in a temperature-based thawing control method according to an embodiment of the present invention, and the thawing completion determination process includes:

Step S602: Continuously obtain the temperature field distribution in the thawing cavity 202 detected by the infrared temperature sensing device 210; the process of obtaining the temperature field distribution in step S602 is the same as the process of obtaining the initial temperature field distribution in the above step S504, the difference lies in the timing of obtaining , The obtaining process of step S602 is at the end of thawing.

Step S604: Determine the temperature value of the grid where each thawed object is located according to the temperature field distribution in the thawing cavity 202; Step S604 determines the temperature value of the grid where each thawed object is located is the same as the above step S506 to determine each grid The process of initial temperature value is the same, and it can also be obtained by the process of sampling value sequence calculation. The difference also lies in the difference in the thawing stage.

Step S606: Determine the thawing temperature of the thawed object according to the temperature value of the grid where the thawed object is located; the specific method for determining the thawing temperature of the thawed object according to the temperature value of the grid where the thawed object is located can be: according to the temperature of the grid where the thawed object is located The value selects the reference grid from the grid where the thawed object is located, and uses the average or median temperature of the reference grid as the thawing temperature. The reference grid selection process can be: find the lowest temperature grid with the lowest temperature from the grid where the thawed object is located, and determine the grid adjacent to the lowest temperature grid; from the grid adjacent to the lowest temperature grid Select the grid whose temperature difference with the lowest temperature grid is within the set temperature difference threshold from the grid, and use the selected grid and the lowest temperature grid as the reference grid; take the temperature value of the reference grid and the lowest temperature grid The average value or the median value of the temperature value is used as the thawing temperature of the thawed object. This method of thawing temperature uses the lowest temperature point of the thawed object and the temperature in the surrounding area as the judgment basis, avoiding the problem of excessive thawing in other areas caused by a low temperature at a certain point, and the temperature of the reference grid is used as the thawing temperature. Determine the overall thawing degree of the thawed object more accurately.

For example, taking the grid divided in Fig. 4 as an example, the grid shown in Fig. 4 will be tested after the defrosting is completed. If the grid is still (X5, Y4) at the lowest temperature, the lowest temperature value Is -3.5 degrees, and the temperature difference threshold is set to 2 degrees, then the coordinates adjacent to (X5, Y4) can be: (X4, Y3), (X4, Y4), (X4, Y5), (X5, Y3) ), (X5, Y5), (X6, Y3), (X6, Y4), (X6, Y5) grids with temperature values ranging from -3.5 degrees to -1.5 degrees and the lowest temperature grid (X5, Y4) as Reference grid.

Step S608: Determine whether the defrosting temperature is greater than or equal to a second preset threshold. The second preset threshold is greater than the first preset threshold and can be set according to defrosting requirements. For example, the general value range may be -4 degrees Celsius to -1 degrees Celsius.

In step S610, if the thawing temperature is greater than or equal to the second preset threshold, it is determined that the thawing is completed and the thawing device 200 is controlled to stop the thawing. That is, after the thawing temperature reaches the second preset threshold, the thawing process is considered complete.

If the thawing temperature is still the second preset threshold, as the thawing process continues, the thawing power of the thawing device 200 can also be reduced according to the thawing temperature.

In addition, in order to avoid local overheating, when the thawing temperature is less than the second preset threshold, it may also include: judging whether the highest temperature value in the grid where the thawed object is located is greater than the third preset threshold, and if so, controlling the thawing device to pause Unfreeze the set time. The value range of the third preset threshold can be set from -1 degree to 2 degrees, that is, when the local temperature of the grid where the thawed object is located is uneven and a higher temperature occurs, the thawing is suspended to avoid excessive local thawing. The set duration of the thawing pause can also be set according to the thawing characteristics in advance, for example, set to 10 seconds to 1 minute. If the thawing temperature reaches the second preset threshold during the pause process, it is determined that the thawing is completed and the thawing device 200 is controlled. Stop thawing

Fig. 7 is a schematic diagram of a specific application example of a temperature-based thawing control method according to an embodiment of the present invention. This example includes the following steps:

Step S702, a defrosting start command is obtained;

In step S704, it is determined whether the door of the thawing device 200 is in a closed state, so as to avoid the leakage of the thawing signal. If the door is not closed properly, it will output a door closing reminder;

Step S706, start the infrared temperature sensing device 210, and continuously detect the temperature field distribution in the thawing cavity 202;

Step S708, determining the temperature value of each grid according to the temperature field distribution;

Step S710: Determine the grid where the thawed object in the thawing device is located according to the temperature value of the grid;

Step S712, start the radio frequency thawing module or other thawing modules to start thawing the thawed objects;

Step S714: Determine whether the lowest temperature value of the grid where the thawed object is located is greater than or equal to a first preset threshold, such as -6 degrees, to determine whether to enter the thawing completion determination process;

In step S716, the lowest temperature grid with the lowest temperature value is searched from the grid where the thawed object is located, and the temperature difference with the lowest temperature grid is selected from the grids adjacent to the lowest temperature grid within the set temperature difference threshold. Grid, using the lowest temperature grid and the selected grid as the reference grid;

In step S718, the average or median temperature of the reference grid is used as the thawing temperature of the thawed object;

Step S720, determining whether the defrosting temperature is greater than or equal to a second preset threshold, for example -3 degrees;

Step S722, when the thawing temperature is greater than or equal to the second preset threshold, control the thawing device 200 to stop thawing;

Step S724: Determine whether the highest temperature value in the grid where the thawed object is located is greater than a third preset threshold;

In step S726, when the highest temperature value is greater than the third preset threshold, the thawing device 200 is controlled to suspend thawing.

Those skilled in the art should know that this example is only an example, and the sequence of some steps in the above process can be adjusted as needed, and the threshold parameters involved can also be flexibly adjusted as needed. In the method of this embodiment, the judgment process is executed in advance before the end of thawing, and the thawing temperature is used as the basis for judging the completion of thawing, which can effectively avoid insufficient or excessive thawing and improve the quality of thawing.

So far, those skilled in the art should realize that although multiple exemplary embodiments of the present invention have been illustrated and described in detail herein, they can still be disclosed according to the present invention without departing from the spirit and scope of the present invention. The content directly determines or derives many other variations or modifications that conform to the principles of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all these other variations or modifications.

Claims (10)

1. A temperature-based thawing control method, including:

   Acquiring the event that the thawing chamber of the thawing device is put into the thawed object;

   Starting the infrared temperature sensing device of the thawing device, acquiring the initial temperature field distribution in the thawing cavity detected by the infrared temperature sensing device, and the temperature sensing area of the infrared temperature sensing device is divided into a preset number of grids in advance;

   Determining the grid where the thawed object is located according to the initial temperature field distribution;

   Controlling the thawing device to turn on thawing;

   Identifying the lowest temperature value of the grid where the thawed object is located;

   It is judged whether the minimum temperature value is greater than the first preset threshold value, and if so, the thawing completion judging process is executed.
2. The method according to claim 1, wherein the step of determining the grid where the thawed object in the thawing device is located according to the initial temperature field distribution comprises:

   Determining the initial temperature value of each grid according to the initial temperature field distribution;

   Use the grid whose initial temperature value is within a preset preset thawing temperature range as the grid where the thawed object is located.
3. The method according to claim 1, wherein the process of determining the completion of thawing comprises:

   Continuously acquiring the temperature field distribution in the thawing cavity detected by the infrared temperature sensing device;

   Determining the temperature value of the grid where each thawed object is located according to the temperature field distribution in the thawing cavity;

   Determining the thawing temperature of the thawed object according to the temperature value of the grid where the thawed object is located;

   Determine whether the thawing temperature is greater than or equal to a second preset threshold, and if so, determine that thawing is completed and control the thawing device to stop thawing, and the second preset threshold is greater than the first preset threshold.
4. The method according to claim 3, wherein the step of determining the thawing temperature of the thawed object according to the temperature value of the grid where the thawed object is located comprises:

   A reference grid is selected from the grid where the thawed object is located according to the temperature value of the grid where the thawed object is located, and the temperature average or median value of the reference grid is used as the thawing temperature.
5. The method according to claim 4, wherein the step of selecting a reference grid from the grid where the thawed object is located according to the temperature value of the grid where the thawed object is located comprises:

   Selecting the lowest temperature grid with the lowest temperature value from the grids where the thawed object is located, and determining the grid adjacent to the lowest temperature grid;

   From the grids adjacent to the lowest temperature grid, select a grid whose temperature difference with the lowest temperature grid is within a set temperature difference threshold, and use the selected grid and the lowest temperature grid as all the grids. The reference grid.
6. The method according to claim 3, wherein when the thawing temperature is less than the second preset threshold, the method further comprises:

   The thawing power of the thawing device is reduced according to the thawing temperature.
7. The method according to claim 3, wherein when the thawing temperature is less than the second preset threshold value, the method further comprises:

   It is determined whether the highest temperature value in the grid where the thawed object is located is greater than a third preset threshold, and if so, the thawing device is controlled to suspend thawing for a set time period.
8. The method according to claim 1, wherein the event that the thawing cavity is put into a thawed object comprises:

   The event that the door of the thawing device is closed; and/or

   The operating interface of the thawing device receives the thawing trigger signal input by the user; and/or

   The article detector of the thawing device detects that the article is put in the thawing cavity.
9. A thawing device includes:

   An infrared temperature sensing device configured to detect the temperature field distribution of the thawing cavity of the thawing device, and the temperature sensing area of the infrared temperature sensing device is divided into a preset number of grids in advance;

   A control device, which includes a memory and a processor, and a control program is stored in the memory. When the control program is executed by the processor, it is used to implement the defrosting of the thawed object according to any one of claims 1 to 8. Temperature detection method.
10. A refrigerator including:

    The box body defines at least one accommodating space therein;

    The thawing device is arranged in one of the accommodating spaces, and the thawing device is the thawing device according to claim 9.

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