CN113551454B - Temperature-based thawing control method, thawing device and refrigerator - Google Patents

Abstract

The present invention provides a temperature-based thawing control method, a thawing device and a refrigerator. The temperature-based thawing control method includes: continuously acquiring the temperature field distribution of the thawing chamber detected by the infrared temperature sensing device of the thawing device, and the temperature sensing area of the infrared temperature sensing device is pre-divided into a preset number of grids; according to the temperature field distribution Determine the temperature value of each grid; determine the grid where the thawed object is located in the thawing device according to the temperature value of the grid; control the thawing device to open the thawing, and determine the thawed object according to the temperature value of the grid where the thawed object is located during the thawing process. thawing temperature; after the thawing temperature is greater than the preset temperature threshold, the thawing device is controlled to stop thawing. The method of the invention can accurately obtain the temperature value reflecting the actual state of the thawed material, provides an accurate basis for the thawing device to judge the thawing completion, can effectively avoid insufficient thawing or excessive thawing, and improve the thawing quality.

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 processing or eating. 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 thawing through radio frequency and microwave techniques. These thawing devices are improved for heating methods, but most of the thawing control methods are still adjusted according to time, such as timing to end thawing. Although some thawing devices can also set the thawing time according to the weight of the thawing object, or adjust the thawing power according to the thawing time, which improves the flexibility of thawing control to a certain extent, but these thawing devices still cannot guarantee accurate control of the thawing process. As a result, the problem of insufficient thawing or excessive thawing occurs.

Contents of the invention

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

A further object of the invention is to avoid under-thawing and over-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 method comprising: continuously acquiring the temperature field distribution of the thawing cavity detected by the infrared temperature sensing device of the thawing device, and the temperature sensing area of the infrared temperature sensing device is pre-divided into A preset number of grids; determine the temperature value of each grid according to the temperature field distribution; determine the grid where the thawing object is located in the thawing device according to the temperature value of the grid; control the thawing device to start thawing, and during the thawing process according to the The temperature value of the grid where the object is located determines the thawing temperature of the thawed object; after the thawing temperature is greater than the preset temperature threshold, the thawing device is controlled to stop thawing.

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 during the thawing process includes: searching for the lowest temperature grid with the lowest temperature value from the grid where the thawed object is located, and placing the lowest temperature grid grid temperature value as the defrosting temperature.

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 during the thawing process 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 , using the mean or median temperature of the reference grid 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: finding the lowest temperature grid with the lowest temperature value from the grid where the thawed object is located, and determining 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 adjacent to the lowest temperature grid, and select the grid and the lowest temperature grid. temperature grid as a reference grid.

Optionally, the infrared temperature sensing device is configured to continuously detect the temperature field distribution of the thawing cavity according to a preset sampling period; and the step of determining the temperature value of each grid according to the temperature field distribution includes: selecting a thawing of a continuously set number of sampling points Cavity temperature field distribution; the temperature sampling value of each grid is extracted from the temperature field distribution of the thawing cavity at each sampling point, and the temperature sampling value sequence of each grid is obtained, and the temperature sampling value sequence of each grid is carried out Calculate the temperature value of each grid.

Optionally, the step of calculating the temperature value of each grid through the temperature sampling value sequence of each grid includes: screening out extreme values from the temperature sampling value sequence of each grid, taking each grid The average or median value of the remaining temperature sampling values after filtering out the extreme values in the temperature sampling value sequence of the grid is used as the temperature value of the corresponding grid.

Optionally, the step of determining the grid where the thawed object is located in the thawing device according to the temperature value of the grid includes: using the grid whose temperature value is within a preset preset thawing temperature range as the grid where the thawed item is located.

Optionally, before the step of continuously obtaining the temperature field distribution of the thawing chamber detected by the infrared temperature sensing device of the thawing device, the method further includes: obtaining an event that the thawing chamber is put into the thawing object.

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 chamber of the thawing device, and the temperature sensing area of the infrared temperature sensing device is pre-divided into a preset number of grids; the control device 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 realize 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 comprises: a box body defining at least one containing space; a thawing device arranged in one containing space, and the thawing device is the above-mentioned thawing device.

The temperature-based thawing control method of the present invention adopts an infrared temperature-sensing device capable of detecting temperature field distribution as a 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 The detection result determines the temperature value of each grid, determines the grid where the thawed object is located, and further determines the thawing temperature of the thawed object according to the temperature value of the grid where the thawed object is located during the thawing process; The temperature value of the actual state of the object can be detected accurately, which provides an accurate basis for the thawing device to judge the completion of thawing. Since the thawing temperature is used as the basis for judging the completion of thawing, insufficient or excessive thawing can be effectively avoided, and the quality of thawing can be improved.

Furthermore, in the temperature-based thawing control method of the present invention, the temperature value is calculated according to the temperature sampling value sequence of each grid, which avoids detection deviation caused by measurement fluctuations.

Furthermore, 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, and determines the grid adjacent to the lowest temperature grid, and selects the reference grid grid; this selection method can determine the detection area that can reflect the temperature state of the thawed object, so as to obtain a temperature value that is more in line with the judging criteria for thawing control.

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

Those skilled in the art will be more aware of the above and other objects, advantages and features of the present invention according to the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings.

Description of drawings

Hereinafter, some specific embodiments of the present invention will be described in detail by way of illustration and not limitation with reference to the accompanying drawings. The same reference numerals in the drawings designate the same or similar parts or parts. Those skilled in the art will appreciate that the 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;

Fig. 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;

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

Fig. 5 is a schematic diagram of a temperature-sensing area divided into grids by an infrared temperature-sensing device in a temperature-based thawing control method according to an embodiment of the present invention; and

Fig. 6 is a schematic flow chart 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 casing 201 , an infrared temperature sensing device 210 , and a control device 220 . A thawing cavity 202 is formed in the casing 201 for preventing thawed objects. In order to illustrate the internal structure, the door body of the thawing device 200 is not shown in FIG. 1 . The thawing device 200 can thaw the thawed objects put into the thawing cavity 202 by means of radio frequency thawing, microwave thawing, and heating thawing. For example, radio-frequency thawing can be achieved by arranging radio-frequency plates in the thawing chamber 202 , and using the radio-frequency plates to output radio-frequency signals to achieve thawing; and for example, microwave thawing can be achieved by outputting microwave signals from a magnetron. Since the thawing components of the thawing device 200 are well known to those skilled in the art, no further details are given 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 thawed objects into the thawing chamber 202 and continuously detect the temperature field distribution of the thawing chamber 202 during the thawing process. That is to say, 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, and 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 pre-divided into a preset number of grids. The infrared temperature sensing device 210 may be arranged on the top of the thawing chamber 202, so as to divide the thawing chamber 202 into grids from a top view. Those skilled in the art can arrange the infrared temperature sensing device 210 on each cavity wall of the thawing cavity 202 as required. The temperature-sensing lens of the infrared temperature-sensing device 210 can sense through the opening of the casing 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 executed by the processor 221. The processor 221 may be a central processing unit (central processing unit, CPU for short), or a digital signal processing unit (Digital Signal Processing, DSP) or the like. The memory 222 is used to store programs 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 above-mentioned control program 223 may be downloaded from a computer-readable storage medium to a corresponding computing/processing device or downloaded and installed to the thawing device 200 via a network (such as 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, wherein all outer doors of the refrigerator 10 are removed to show the structure of compartments in the box body 100 of the refrigerator 10 . The refrigerator 10 may generally include a box body 100 defining at least one storage space, a compartment door for opening and closing access openings of each storage space, and a thawing device 200 disposed in one storage space. In the illustrated embodiment, there is one thawing device 200 .

In some embodiments, the number of accommodation 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-varying compartment 120, and a freezing compartment 130, and refrigerating compartments for opening and closing the refrigerating compartment 110, the varying-temperature compartment 120, and the freezing compartment 130, respectively. Door body, variable temperature door body and freezing door body. The thawing device 200 may be disposed in the variable temperature compartment 120 . The thawing device 200 can be fixed in the variable temperature compartment 120 by means of interference fit or clamping with the inner walls of the vertical two sides of the variable temperature compartment 120 . The defrosting switch can be set on the variable temperature door body.

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

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

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

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, so that the temperature value reflecting the actual state of the thawed object can be accurately obtained, and the detection is accurate. Thaw control provides 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. 4 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 S402 , continuously acquire the temperature field distribution of the thawing chamber detected by the infrared temperature sensing device 210 of the thawing device 200 . Before step S402 , the event that the thawing chamber 202 is put into the thawing object may be obtained, that is, it is determined that the thawing object is put into the thawing chamber 202 . The event that the thawing chamber 202 is put into the thawing object may include: the event that the door body of the thawing device 200 is closed, that is, detecting an action of closing the door body after the user puts the thawing object. Or the operation interface of the thawing device 200 receives a thawing trigger signal input by the user, that is, the user instructs the thawing device 200 that the thawing object has been put into the thawing device 200 through a thawing switch or other control devices. Or the object detector of the thawing device 200 detects that an object is put into the thawing cavity 202 . The object detector can be a weighing device, a radio frequency generator that detects the object put in through the change of the dielectric constant in the thawing chamber 202, or an image recognition device that determines the thawed object through image recognition, etc. In some embodiments, the thawing device 200 may combine one or more of the above methods to detect the thawed object. After it is determined that the thawing chamber 202 is put into the thawing object, the infrared temperature sensing device 210 of the thawing device 200 is started to detect the temperature of the thawing chamber 202 .

Fig. 5 is a schematic diagram of a temperature-sensing area 211 divided into grids by an infrared temperature-sensing device 210 in a temperature-based thawing control method according to an embodiment of the present invention. For the convenience of description, the grids of the temperature-sensing regions 211 in FIG. 5 use their row and column numbers 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 of different locations of the thawing chamber 202 can be determined. The method of this embodiment can accurately determine the position of the thawed object through the gridded 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. 5 is only an example, and those skilled in the art can make adjustments as needed.

Step S404, determine the temperature value of each grid according to the temperature field distribution, that is, determine the temperature value of each grid according to the detection result of the infrared temperature sensing device 210 . In order to avoid fluctuations in the data of one temperature sampling, accurate temperature can be obtained by processing multiple sampling values. For example, the infrared temperature sensing device 210 is configured to continuously detect the temperature field distribution of the thawing chamber 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 chamber of a continuously set number of sampling points; extracting each grid respectively from the temperature field distribution of the thawing chamber at each sampling point The temperature sampling value of each grid is obtained to obtain the temperature sampling value sequence of each grid, and the temperature value of each grid is obtained by calculating the temperature sampling value sequence of each grid. The infrared temperature sensing device 210 can set a sampling period according to its own detection capability, for example, continuously collect temperatures at multiple points at a frequency of 2 to 10 times per second. The above-mentioned sampling point specifically refers to the measurement moment when the temperature measurement is performed.

The step of determining the temperature value of each grid is by filtering extreme values (such as maximum and/or minimum values) from the temperature sample value sequence of each grid, and taking the temperature sample value sequence of each grid to filter out The average or median value of the remaining temperature sampling values after the extremum is used as the temperature value of the corresponding grid, which avoids sampling errors.

For example, for the grid of (X5, Y4), the temperatures 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 degree, -18.1 degree, -18.2 degree, remove two extreme values (maximum value and minimum value), calculate the average value as -18.2 degree, then the temperature value of the grid (X5, Y4) obtained in this measurement can be determined It is -18.2 degrees.

The grids shown in Figure 5 are detected in turn, and the temperature values of the grids are obtained as shown in Table 1:

Table 1

Step S406, according to the temperature value of the grid, determine the grid where the thawed object is located in the thawing device 200, for example, the grid whose temperature value is within the preset thawing temperature range can be used as the grid where the thawed item is located. The actual temperature of the thawed object is generally below the freezing point, and the temperature difference between it and other regions in the thawing chamber 202 is obvious. Those skilled in the art can set the preset thawing temperature range according to the freezing point temperature of the thawed object, so as to determine the location of the thawed object in the thawing device 200. grid. With the example temperature shown in Table 1, it can be determined that the formulas of (X4,Y2), (X4,Y3), (X4,Y4), (X4,Y5), (X4,Y6), (X5,Y2), ( X5, Y3), (X5, Y4), (X5, Y5), (X5, Y6), (X6, Y3), (X6, Y4), (X6, Y5), (X6, Y6), (X7, The area 510 composed of Y3), (X7, Y4), (X7, Y5), and (X7, Y6) is the area where the thawed objects are located.

Step S408, control the thawing device 200 to start thawing, and determine the thawing temperature of the thawed object according to the temperature value of the grid where the thawed object is located during the thawing process. The thawing temperature of the thawing object is calculated according to the temperature value of the grid where the thawing object is located. An optional calculation method is: find the lowest temperature grid with the lowest temperature value from the grid where the thawed object is located, and use the temperature value of the lowest temperature grid as the thawing temperature. That is to say, the lowest temperature is used as the control basis for the completion of thawing. This method can ensure that after the thawing is completed, the thawed object does not have the problem of insufficient thawing.

Another optional calculation method is: select 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 use the average or median temperature of the reference grid as the thawing temperature. The selection process of the reference grid can be as follows: find the lowest temperature grid with the lowest temperature value from the grid where the thawed object is located, and determine 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, and use the selected grid and the lowest temperature grid as the reference grid; take the temperature value of the reference grid and the temperature value of the lowest temperature grid. The average or median value of the temperature values is used as the thawing temperature of the thawed object. The thawing temperature of this method takes 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 local point, and using the temperature of the reference grid as the thawing temperature, which can be used More accurately determine the overall degree of thawing of thawed items. In this embodiment, the method of using the reference grid as the thawing temperature can be preferably adopted.

Taking the example temperature shown in Table 1, according to the rules, the grid corresponding to the lowest temperature point -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 area 520 in Fig. 5 is the minimum temperature grid and The region where the reference grid is located. If the set temperature difference threshold is set to 2 degrees, the grids whose absolute temperature difference is less than 2 degrees include (X5,Y3), (X5,Y5), (X6,Y3), (X6,Y4), (X6, Y5), it is obtained that the thawing temperature of the thawed material is -17.6°C. Those skilled in the art can set the temperature difference threshold as required, generally the temperature difference threshold can be set between plus and minus 3 to 0.

By determining the reference grid, the area around the lowest temperature of the thawed object can be determined, so that the temperature value that can best reflect the actual state of the thawed object can be obtained, and the thawing temperature obtained through steps S402 to S408 can be used as the basis for thawing control. The process is controlled more precisely.

Step S410, after the thawing temperature is greater than the preset temperature threshold, control the thawing device to stop thawing. The temperature threshold can be set according to the temperature of the thawed object, for example, the value range can be -4 degrees Celsius to -1 degrees Celsius. That is, after the thawing temperature reaches the preset temperature threshold, it is considered that the thawing process is completed.

The method of this embodiment can accurately obtain the temperature value reflecting the actual state of the thawed object, and the detection is accurate, which provides an accurate basis for the thawing device to judge the completion of thawing, can effectively avoid insufficient thawing or excessive thawing, and improve the quality of thawing.

FIG. 6 is a schematic flow chart of a temperature-based thawing control method according to an embodiment of the present invention. When using the temperature-based thawing control method of this embodiment, the following process can be performed:

Step S602, obtaining a defrosting start command;

Step S604, judging whether the door body of the thawing device 200 is closed, so as to avoid leakage of the thawing signal. If the door is not closed properly, a door closing reminder will be output;

Step S606, start the infrared temperature sensing device 210, and obtain the detection results of a plurality of continuous sampling points;

Step S608, screen out the extreme values from the temperature sampling value sequence of each grid, and take the average or median value of the remaining temperature sampling values after screening out the extreme values in the temperature sampling value sequence of each grid as the corresponding network grid temperature value;

Step S610, determining the grid where the thawed object in the thawing device is located according to the temperature value of the grid;

Step S612, start the radio frequency thawing module or other thawing modules, and start thawing the thawed objects;

Step S614, find the lowest temperature grid with the lowest temperature value from the grid where the thawed object is located, and select the grid with the temperature difference from the lowest temperature grid selected from the grids adjacent to the lowest temperature grid within the set temperature difference threshold Grid, the lowest temperature grid and the selected grid as the reference grid;

Step S616, taking the average or median temperature of the reference grid as the thawing temperature of the thawed object;

Step S618, judging whether the thawing temperature is greater than a preset temperature threshold;

Step S620, after the thawing temperature is greater than the preset temperature threshold, control the thawing device 200 to stop thawing.

The method of this embodiment can determine the region and its temperature that can reflect the actual thawing state of the thawing object, so as to obtain a temperature value that is more in line with the judgment basis for thawing control. Accurate basis can effectively avoid over-thawing or under-thawing.

So far, those skilled in the art should appreciate that, although a number of exemplary embodiments of the present invention have been shown and described in detail herein, without departing from the spirit and scope of the present invention, the disclosed embodiments of the present invention can still be used. Many other variations or modifications consistent with the principles of the invention are directly identified or derived from the content. Accordingly, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims (7)

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

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

determining a temperature value for each grid according to the temperature field distribution;

determining the grid where the unfrozen object in the unfreezing device is located according to the temperature value of the grid;

controlling the unfreezing device to start unfreezing, and determining the unfreezing temperature of the unfrozen object according to the temperature value of the grid where the unfrozen object is located in the unfreezing process;

controlling the unfreezing device to stop unfreezing after the unfreezing temperature is greater than a preset temperature threshold value;

wherein, the step of determining the thawing temperature of the thawed matter according to the temperature value of the grid where the thawed matter is located in the thawing process comprises the following steps:

selecting a reference grid from the grids where the unfrozen objects are located according to the temperature value of the grid where the unfrozen objects are located, and taking the average or median value of the temperature of the reference grid as the unfreezing temperature;

wherein the step of selecting a reference grid from the grid where the unfrozen object is located according to the temperature value of the grid where the unfrozen object is located comprises:

searching the lowest temperature grid with the lowest temperature value from the grids where the unfrozen objects are located, and determining the grid adjacent to the lowest temperature grid;

and selecting grids with the temperature difference within a set temperature difference threshold value from grids adjacent to the lowest temperature grid, and taking the selected grids and the lowest temperature grid as the reference grids.

2. The method of claim 1, wherein,

the infrared temperature sensing equipment is configured to continuously detect the temperature field distribution of the thawing cavity according to a preset sampling period; and is provided with

The step of determining a temperature value for each of the grids based on the temperature field distribution comprises:

selecting the distribution of the thawing cavity temperature fields of a continuous set number of sampling points;

and respectively extracting the temperature sampling value of each grid from the unfreezing cavity temperature field distribution of each sampling point to obtain a temperature sampling value sequence of each grid, and calculating through the temperature sampling value sequence of each grid to obtain the temperature value of each grid.

3. The method of claim 2, wherein the step of calculating the temperature value for each of the grids from the sequence of temperature sample values for each of the grids comprises:

and screening out extreme values from the temperature sampling value sequence of each grid, and taking the average value or the median value of the residual temperature sampling values of the temperature sampling value sequence of each grid after the extreme values are screened out as the temperature value of the corresponding grid.

4. The method of claim 1, wherein the step of determining the grid in which the thawed material is located within the thawing apparatus from the temperature values of the grid comprises:

and taking the grid with the temperature value within a preset unfreezing temperature range as the grid where the unfrozen object is located.

5. The method according to claim 1, wherein the step of continuously acquiring the thawing chamber temperature field distribution detected by the infrared temperature sensing device of the thawing device further comprises the following steps:

and acquiring the event that the thawing cavity is filled with the thawing substance.

6. A thawing apparatus, comprising:

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

a control device comprising a memory and a processor, the memory having stored therein a control program for implementing the temperature-based thawing control method according to any of claims 1 to 5 when executed by the processor.

7. A refrigerator, comprising:

a case defining at least one receiving space therein;

a thawing device provided in one of the accommodation spaces, the thawing device being the thawing device according to claim 6.

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