CN113915835B - Refrigerator and refrigerator food material positioning method - Google Patents
Refrigerator and refrigerator food material positioning method Download PDFInfo
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- CN113915835B CN113915835B CN202110972588.7A CN202110972588A CN113915835B CN 113915835 B CN113915835 B CN 113915835B CN 202110972588 A CN202110972588 A CN 202110972588A CN 113915835 B CN113915835 B CN 113915835B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D23/00—General constructional features
- F25D23/006—General constructional features for mounting refrigerating machinery components
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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Abstract
The invention discloses a refrigerator and a refrigerator food material positioning method, which comprise the following steps: receiving a data signal sent by a host of a reader-writer, wherein the data signal comprises: the reference signal intensity of each fixed tag and the mobile signal intensity of a target mobile tag of a target food material are detected by an antenna; calculating the reference distance from the antenna to each fixed tag according to the reference signal strength, and calculating the moving distance from the antenna to the moving tag according to the moving signal strength; obtaining a distance difference value between a reference distance and a moving distance corresponding to the same antenna; integrating fixed tags corresponding to the reference distances with the distance difference values meeting the preset difference value threshold into a fixed tag set, and obtaining the fixed tag sets corresponding to the number of the antennas until all the antennas are obtained; taking intersection of the fixed label sets to obtain a target fixed label; and determining the position of the target food material according to the position of the target fixed tag. By adopting the embodiment of the invention, the food materials in the refrigerator can be accurately positioned.
Description
Technical Field
The invention relates to the technical field of refrigerators, in particular to a refrigerator and a refrigerator food material positioning method.
Background
When the existing refrigerator is used, a user often forgets which compartment of the refrigerator food is stored in, does not know what food is stored in a certain compartment of the refrigerator, needs to open the refrigerator to turn over one by one, wastes time and labor, and causes that cold air of the refrigerator leaks to cause power consumption increase. With the increasing degree of intellectualization of refrigerators, more and more refrigerators selectively identify food in the refrigerator by applying a Radio Frequency Identification (RFID) technology, and inform a user of a storage room where the food is stored by identifying the storage location of the RFID tag by simultaneously placing the food and the corresponding RFID tag in the refrigerator. However, the existing technology for identifying the storage location of food based on RFID tag can only identify the storage room in which the food is stored, and cannot further identify the distribution location of the food in the storage room.
Disclosure of Invention
The embodiment of the invention aims to provide a refrigerator and a refrigerator food material positioning method, which can improve the accuracy of food material positioning and enable a user to quickly know the storage position of food material.
To achieve the above object, an embodiment of the present invention provides a refrigerator, including:
a cabinet serving as a support structure of the refrigerator and having a plurality of storage compartments therein;
the reader-writer comprises a reader-writer host and a plurality of antennas, and the reader-writer transmits or receives radio frequency signals to the RFID label through the antennas so that the RFID label calculates the signal intensity and returns the signal intensity to the reader-writer host through the antennas; the RFID tags comprise a plurality of fixed tags and at least one mobile tag, the fixed tags are electronic tags installed in preset positions of the storage room, and the mobile tags are electronic tags bound with food materials;
the controller is configured to:
responding to the positioning operation of the target food material, and receiving a data signal sent by the reader-writer host; wherein the data signal comprises: the reference signal intensity of each fixed tag detected by the antenna and the mobile signal intensity of a target mobile tag corresponding to the target food material;
calculating a reference distance from the antenna to each fixed tag according to the reference signal strength, and calculating a moving distance from the antenna to the mobile tag according to the moving signal strength;
obtaining a distance difference value between the reference distance and the moving distance corresponding to the same antenna;
integrating the fixed tags corresponding to the reference distances of which the distance difference values meet the preset difference value threshold value into a fixed tag set, and obtaining the fixed tag sets corresponding to the number of the antennas until all the antennas are obtained;
acquiring an intersection of the fixed label sets to obtain a target fixed label;
and determining the position of the target food material according to the position of the target fixed tag.
As an improvement of the above, the controller is further configured to:
receiving the intensity of a signal to be detected from the antenna to each fixed tag sent by the reader-writer host when responding to the distribution positioning operation of the food materials;
comparing the intensity of the signal to be detected with the intensity of a preset standard signal; wherein the standard signal intensity is the signal intensity from the antenna to each fixed tag when no food material is stored in the storage room;
and determining the distribution of the food materials in the storage chamber according to the comparison result.
As an improvement of the above solution, the calculating the moving distance from the antenna to the mobile tag according to the moving signal strength includes:
and calculating the moving distance from the antenna to the mobile tag according to the moving distance, the environment attenuation factor and the unit signal strength and a preset tag distance calculation strategy.
As an improvement of the above scheme, the determining the position of the target food material according to the position of the target fixed tag includes:
when the target fixed tag is 1, taking the position of the target fixed tag as the position of the target food material;
when the target fixed tags are larger than 1 and smaller than a preset number threshold, taking the middle positions of the target fixed tags as the positions of the target food materials;
and when the target fixed tags are larger than or equal to the preset number threshold, re-responding to the positioning operation of the target food materials.
As an improvement of the above solution, after determining the position of the target food material according to the position of the target fixed tag, the controller is further configured to:
and presenting the position of the target food material to a user in a text prompt mode, a voice prompt mode and an image prompt mode.
In order to achieve the above object, an embodiment of the present invention further provides a method for positioning food materials for a refrigerator, where the refrigerator includes a reader/writer, the reader/writer includes a reader/writer host and a plurality of antennas, and the reader/writer transmits or receives radio frequency signals to an RFID tag through the antennas, so that the RFID tag calculates signal strength and returns the signal strength to the reader/writer host through the antennas; the RFID tag comprises a plurality of fixed tags and at least one movable tag, the fixed tags are electronic tags installed in preset positions of the storage room, and the movable tags are electronic tags bound with food materials; the refrigerator food material positioning method comprises the following steps:
responding to the positioning operation of the target food material, and receiving a data signal sent by the reader-writer host; wherein the data signal comprises: the reference signal intensity of each fixed tag detected by the antenna and the mobile signal intensity of a target mobile tag corresponding to the target food material;
calculating a reference distance from the antenna to each fixed tag according to the reference signal strength, and calculating a moving distance from the antenna to the moving tag according to the moving signal strength;
obtaining a distance difference value between the reference distance and the moving distance corresponding to the same antenna;
integrating the fixed tags corresponding to the reference distances of which the distance difference values meet the preset difference value threshold value into a fixed tag set, and obtaining the fixed tag sets corresponding to the number of the antennas until all the antennas are completely obtained;
acquiring an intersection of the fixed label sets to obtain a target fixed label;
and determining the position of the target food material according to the position of the target fixed tag.
As an improvement of the above, the method further comprises:
receiving the intensity of a signal to be tested from the antenna to each fixed tag sent by the reader-writer host when responding to the operation of distributing and positioning food materials;
comparing the intensity of the signal to be detected with the intensity of a preset standard signal; wherein the standard signal intensity is the signal intensity from the antenna to each fixed tag when no food material is stored in the storage room;
and determining the distribution of the food materials in the storage chamber according to the comparison result.
As an improvement of the above solution, said calculating the moving distance from the antenna to the mobile tag according to the moving signal strength includes:
and calculating the moving distance from the antenna to the mobile tag according to the moving distance, the environment attenuation factor and the unit signal strength and a preset tag distance calculation strategy.
As an improvement of the above scheme, the determining the position of the target food material according to the position of the target fixed tag includes:
when the target fixed tag is 1, taking the position of the target fixed tag as the position of the target food material;
when the target fixed tags are larger than 1 and smaller than a preset number threshold, taking the middle positions of the target fixed tags as the positions of the target food materials;
and when the target fixed tags are larger than or equal to the preset number threshold, re-responding to the positioning operation of the target food materials.
As an improvement of the above scheme, after determining the position of the target food material according to the position of the target fixed tag, the method further includes:
and presenting the position of the target food material to a user in a text prompt mode, a voice prompt mode and an image prompt mode.
Compared with the prior art, according to the refrigerator and the refrigerator food material positioning method disclosed by the embodiment of the invention, the plurality of fixed tags for reference are arranged in the refrigerator in advance, the antennas are provided with the antennas which are arranged at different positions in a multipath manner, when the target food material needs to be accurately positioned, the position of the target food material is calculated according to the RSSI data of the mobile tag and the fixed tag of the target food material, which are acquired by the antennas, and the fixed tag is taken as a reference object because the position of the fixed tag is unchanged, so that the position of the food material can be accurately positioned, and the accurate positioning of the target food material is realized. In addition, the RSSI values of the antennas corresponding to the fixed tags acquired by the antennas are prestored under the condition of no shielding, and if the RSSI values detected in the subsequent ranging process are smaller than the RSSI values detected when the antennas are not shielded, the fixed tags are considered to be shielded, and the corresponding RSSI data of the antennas corresponding to the fixed electronic tags acquired by the antennas are compared with the corresponding RSSI data under the condition of no shielding, so that the spatial distribution of food materials in the refrigerator can be described, a user can know the distribution condition of the food materials in the refrigerator under the condition of not opening the refrigerator door, and further can know whether the vacant positions exist to place other food materials.
Drawings
Fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention;
fig. 2 is a flowchart of a refrigerator food material positioning method according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention, where the refrigerator includes:
a cabinet 10 serving as a support structure of the refrigerator and having a plurality of storage compartments therein;
the reader-writer 20 comprises a reader-writer host and a plurality of antennas, and the reader-writer 20 transmits or receives radio frequency signals to the RFID label through the antennas so that the RFID label calculates the signal intensity and returns the signal intensity to the reader-writer host through the antennas; the RFID tags comprise a plurality of fixed tags and at least one mobile tag, the fixed tags are electronic tags installed in preset positions of the storage room, and the mobile tags are electronic tags bound with food materials;
the controller 30 is configured to:
responding to the positioning operation of the target food material, and receiving a data signal sent by the reader-writer host; wherein the data signal comprises: the reference signal intensity of each fixed tag detected by the antenna and the mobile signal intensity of a target mobile tag corresponding to the target food material;
calculating a reference distance from the antenna to each fixed tag according to the reference signal strength, and calculating a moving distance from the antenna to the moving tag according to the moving signal strength;
obtaining a distance difference value between the reference distance and the moving distance corresponding to the same antenna;
integrating the fixed tags corresponding to the reference distances of which the distance difference values meet the preset difference value threshold value into a fixed tag set, and obtaining the fixed tag sets corresponding to the number of the antennas until all the antennas are obtained;
taking an intersection of the fixed label sets to obtain a target fixed label;
and determining the position of the target food material according to the position of the target fixed tag.
It should be noted that the reader/writer 20 adopted in the embodiment of the present invention includes a reader/writer host and a plurality of antennas, the reader/writer host is used as a transmission medium for the antennas and the controller 30, and transmits or receives a radio frequency signal to the RFID tag through the antennas, so that the RFID tag calculates the signal strength and returns the signal strength to the antennas, the antennas then transmit the signal strength to the reader/writer host, and the reader/writer host then transmits the signal strength to the controller.
It can be understood that the more the number of the antennas and the fixed tags is, the more accurate the positioning is, and the specific number can be determined according to the layout situation of the internal structure of the refrigerator. The antenna can be arranged on 8 top corners, 12 edges and 6 surfaces of the storage space of the refrigerator, and staggered distribution is achieved. The fixed labels are placed on 4 top corners, 4 edges and planes of the object placing plate, and staggered distribution is achieved. Through the reasonable arrangement of the positions of the antennas and the fixed tags, the connection line of each antenna and each fixed tag can cover most of the storage space of the refrigerator. It will be understood that the term "connecting line" as used herein is not a true line, but rather is an imaginary line connecting an antenna to a fixed tag. After any antenna and all the fixed labels are connected, a plurality of connecting lines with different lengths and directions are formed in the storage space of the refrigerator.
When the food material with the mobile tag is placed on the storage plate of the refrigerator, the food material can cut off some connecting lines, namely, the food material is shielded between a certain antenna and a certain fixed tag. Meanwhile, the electronic tag of the food material and each antenna form a plurality of new connecting lines. When another food material is put into the refrigerator, the food material can form shielding between some antennas and fixed tags, and can also form shielding between the movable tags of the previous food material and some antennas.
The external antenna is arranged on the outer surface of the refrigerator door body, when a user binds/unbinds food materials and the mobile tag, the user firstly swipes the card on the external antenna by the mobile tag, and then inputs the information of the food materials to bind the mobile tag.
Specifically, when a user wants to obtain a position of a target food material, a name of the target food material may be input on a human-computer interaction module (for example, a display screen) of a refrigerator, and at this time, the controller responds to a target food material positioning operation, receives a data signal sent by the reader-writer host, and obtains, from the data signal, reference signal strengths of the fixed tags detected by the antenna and mobile signal strengths of the target mobile tags corresponding to the target food material.
Specifically, after the mobile signal strength is obtained, a moving distance from the antenna to the mobile tag is calculated according to the mobile signal strength, where the moving distance may be represented as: d-f-1, D-f-2 and D-f-3, 8230. D-f-1 means the distance between the target food material f (mobile tag) and the antenna No. 1.
Optionally, the calculating a moving distance from the antenna to the mobile tag according to the moving signal strength includes:
calculating the moving distance from the antenna to the mobile tag according to the moving distance, the environment attenuation factor and the unit signal strength and a preset tag distance calculation strategy, and satisfying the following formula:
d＝10^((abs(rssi)-A)/(10*n))；
wherein d represents the moving distance (unit: meter); rssi represents the mobile signal strength; a represents the signal strength when the transmitting end and the receiving end are separated by 1 meter, namely the mobile signal strength; n represents an environmental attenuation factor and is a constant.
Specifically, the reference distance from the antenna to each of the fixed tags is calculated according to the reference signal strength, and the calculation mode is the same as the calculation mode of the moving distance, which is not described herein again. The reference distance is expressed as: D-X-Y, which is the reference distance from the fixed tag No. X to the antenna No. Y, wherein the reference distance from each antenna to each fixed tag can be recorded as an array, for example: d-1= [ D-1, D-2-1, D-3-1 \8230 ], D-2= [ D-1-2, D-2, D-3-2 \8230 ], \8230;, \8230).
After the moving distance and the reference distance are obtained, the distance difference between the reference distance and the moving distance corresponding to the same antenna is obtained, for example, the moving distance D-f-1 from the antenna No. 1 to the moving tag of the target food material is compared with the data of the reference distance D-1 array from the antenna No. 1 to each fixed tag one by one, and the distance difference is calculated.
Specifically, data with similar distances are selected to form a new array, and at this time, the fixed labels corresponding to the reference distances meeting the distance difference value meeting the preset difference value threshold are integrated into a fixed label set. For example: d-1'= [ D-2-1, D-3-1, D-5-1, D-8-1], and then the data in the D-1' data is converted into a corresponding fixed tag set D-1"= [2,3,5,8], at this time, the fixed tag of the data number in the array of the fixed tag set D-1" can be considered to be close to the position of the moving tag of the target food material. In the same way, other fixed tag sets D-2 ', D-3 ', D-4 ' are obtained in the same way.
Specifically, an intersection is taken for the fixed tag set, for example, the intersection is taken for the numbers in the array D-1", D-2", D-3 "\8230, and a new array is obtained, for example, D = [2] or D = [2,3], where the target fixed tag is number 2, or numbers 2 and 3.
Specifically, the determining the position of the target food material according to the position of the target fixed tag includes:
when the target fixed tag is 1, taking the position of the target fixed tag as the position of the target food material;
when the target fixed tags are larger than 1 and smaller than a preset number threshold, taking the middle position of the target fixed tags as the position of the target food material;
and when the target fixed tags are larger than or equal to the preset number threshold, re-responding to the positioning operation of the target food materials.
Illustratively, the quantity threshold is 4. When D = [2], taking the position of the target fixed tag 2 as the position of the target food material; when D = [2,3], taking the middle position of the target fixed tags 2 and 3 as the position of the target food material; when D = [2,3,4], the target fixed tag 3 is taken as the position of the target food material, and when D = [2,3,4,5], because the obtained target fixed tags are more, the data is inaccurate, at this time, re-measurement is required.
Further, after the position of the target food material is obtained, the position of the target food material is presented to a user in a text prompt mode, a voice prompt mode and an image prompt mode, and the user can accurately take the target food material according to the position.
More further, the controller is further configured to:
receiving the intensity of a signal to be tested from the antenna to each fixed tag sent by the reader-writer host when responding to the operation of distributing and positioning food materials;
comparing the intensity of the signal to be detected with the intensity of a preset standard signal; wherein the standard signal intensity is the signal intensity from the antenna to each fixed tag when no food material is stored in the storage room;
and determining the distribution of the food materials in the storage chamber according to the comparison result.
For example, when a user needs to dissolve the food material distribution in the refrigerator, a food material distribution understanding instruction may be input on a human-computer interaction module (such as a display screen) of the refrigerator, and at this time, the controller responds to a food material distribution positioning operation. For example: the signal strength sent by the antenna 3 to the fixed tag 5 is recorded as RSSI-5-3, if RSSI-5-3= RSSI-S-5-3, it is considered that no food material exists between the antenna 3 and the fixed tag 5, if RSSI-5-3 is constructed as RSSI-S-5-3, it is considered that food material exists between the antenna 3 and the fixed tag 5, and the food material distribution in the refrigerator can be generally depicted through the comparison result of the signal strength values of all the fixed tags acquired by all the antennas.
Compared with the prior art, according to the refrigerator disclosed by the embodiment of the invention, the plurality of fixed tags for reference are arranged in the refrigerator in advance, the antennas are provided with the plurality of paths of antennas arranged at different positions, when the target food material needs to be accurately positioned, the position of the target food material is calculated according to the RSSI data of the mobile tag and the fixed tag of the target food material, which are acquired by the antennas, and the position of the fixed tag is unchanged, so that the position of the food material can be accurately positioned by taking the fixed tag as a reference object, and the accurate positioning of the target food material is realized. In addition, the RSSI values of the antennas corresponding to the fixed tags acquired by the antennas are prestored under the condition of no shielding, and if the RSSI values detected in the subsequent ranging process are smaller than the RSSI values detected when the antennas are not shielded, the fixed tags are considered to be shielded, and the corresponding RSSI data of the antennas corresponding to the fixed electronic tags acquired by the antennas are compared with the corresponding RSSI data under the condition of no shielding, so that the spatial distribution of food materials in the refrigerator can be described, a user can know the distribution condition of the food materials in the refrigerator under the condition of not opening the refrigerator door, and further can know whether the vacant positions exist to place other food materials.
Referring to fig. 2, fig. 2 is a flowchart of a refrigerator food material positioning method provided by an embodiment of the present invention, where a refrigerator includes a reader-writer, the reader-writer includes a reader-writer host and a plurality of antennas, and the reader-writer transmits or receives a radio frequency signal to an RFID tag through the antennas, so that the RFID tag calculates signal strength and returns the signal strength to the reader-writer host through the antennas; the RFID tags comprise a plurality of fixed tags and at least one mobile tag, the fixed tags are electronic tags installed in preset positions of the storage room, and the mobile tags are electronic tags bound with food materials; the refrigerator food material positioning method comprises the following steps:
s1, responding to a target food material positioning operation, and receiving a data signal sent by a reader-writer host; wherein the data signal comprises: the reference signal intensity of each fixed tag detected by the antenna and the mobile signal intensity of a target mobile tag corresponding to the target food material;
s2, calculating a reference distance from the antenna to each fixed tag according to the reference signal strength, and calculating a moving distance from the antenna to the moving tag according to the moving signal strength;
s3, obtaining a distance difference value between the reference distance and the moving distance corresponding to the same antenna;
s4, integrating the fixed tags corresponding to the reference distances of which the distance difference values meet a preset difference threshold value into a fixed tag set, and obtaining the fixed tag sets corresponding to the number of the antennas until all the antennas are obtained;
s5, acquiring an intersection of the fixed label sets to obtain a target fixed label;
s6, determining the position of the target food material according to the position of the target fixed tag.
It should be noted that the reader/writer employed in the embodiment of the present invention includes a reader/writer host and a plurality of antennas, the reader/writer host is used as a transmission medium for the antennas and the controller, and transmits or receives a radio frequency signal to the RFID tag through the antennas, so that the RFID tag calculates the signal strength and returns the signal strength to the antennas, the antennas then transmit the signal strength to the reader/writer host, and the reader/writer host then transmits the signal strength to the controller.
It can be understood that the more the number of the antennas and the fixed tags is, the more accurate the positioning is, and the specific number can be determined according to the layout situation of the internal structure of the refrigerator. The antenna can be arranged on 8 top corners, 12 edges and 6 surfaces of the storage space of the refrigerator, and staggered distribution is achieved. The fixed labels are placed on 4 top corners, 4 edges and planes of the object placing plate, and staggered distribution is achieved. Through the reasonable arrangement of the positions of the antennas and the fixed tags, the connection line of each antenna and each fixed tag can cover the vast majority of the storage space of the refrigerator. It will be understood that the term "connecting line" as used herein is not a true line, but rather is an imaginary line connecting an antenna to a fixed tag. After any antenna and all the fixed labels are connected, a plurality of connecting lines with different lengths and directions are formed in the storage space of the refrigerator.
When the food material with the mobile tag is placed on the storage board of the refrigerator, the food material can cut off some connecting lines, namely the food material is shielded between a certain antenna and a certain fixed tag. Meanwhile, the electronic tag of the food material and each antenna form a plurality of new connecting lines. When food materials are put into the refrigerator, the food materials can form shielding between some antennas and fixed tags, and can also form shielding between the movable tags of the previous food materials and some antennas.
The external antenna is arranged on the outer surface of the refrigerator door body, when a user binds/unbinds food materials and the mobile tag, the user firstly swipes the card on the external antenna by the mobile tag, and then inputs the information of the food materials to bind the mobile tag.
Specifically, in step S1, when a user wants to obtain a location of a target food material, a name of the target food material may be input on a human-computer interaction module (for example, a display screen) of a refrigerator, at this time, the controller responds to a target food material positioning operation, receives a data signal sent by the reader/writer host, and obtains, from the data signal, a reference signal intensity of each fixed tag detected by the antenna and a mobile signal intensity of a target mobile tag corresponding to the target food material.
Specifically, in step S2, after the mobile signal strength is obtained, a moving distance from the antenna to the mobile tag is calculated according to the mobile signal strength, where the moving distance may be represented as: d-f-1, D-f-2 and D-f-3 \8230. D-f-1 means the distance between the target food material f (mobile tag) and antenna No. 1.
Optionally, the calculating a moving distance from the antenna to the mobile tag according to the moving signal strength includes:
calculating the moving distance from the antenna to the mobile tag according to the moving distance, the environment attenuation factor and the unit signal strength and a preset tag distance calculation strategy, wherein the following formula is satisfied:
d＝10^((abs(rssi)-A)/(10*n))；
wherein d represents the moving distance (unit: meter); rssi represents the mobile signal strength; a represents the signal strength when the transmitting end and the receiving end are separated by 1 meter, namely the mobile signal strength; n represents an environmental attenuation factor and is a constant.
Specifically, the reference distance from the antenna to each of the fixed tags is calculated according to the reference signal strength, and the calculation mode is the same as the calculation mode of the moving distance, which is not described herein again. The reference distance is expressed as: D-X-Y, which is the reference distance from the fixed tag No. X to the antenna No. Y, wherein the reference distance from each antenna to each fixed tag can be recorded as an array, for example: d-1= [ D-1, D-2-1, D-3-1 \8230 ], D-2= [ D-1-2, D-2, D-3-2 \8230 ], \8230;, \8230).
Specifically, in step S3, after the moving distance and the reference distance are obtained, the distance difference between the reference distance and the moving distance corresponding to the same antenna is obtained, for example, the moving distance D-f-1 from the antenna No. 1 to the moving tag of the target food material is compared with the data of the array of the reference distances D-1 from the antenna No. 1 to each fixed tag one by one, and the distance difference is calculated.
Specifically, in step S4, data with similar distances are selected to form a new array, and at this time, the fixed tags corresponding to the reference distances satisfying the distance difference satisfying the preset difference threshold are integrated into a fixed tag set. For example: d-1'= [ D-2-1, D-3-1, D-5-1, D-8-1], and then the data in the D-1' data is converted into a corresponding fixed tag set D-1'= [2,3,5,8], at this time, the fixed tag of the data number in the array of the fixed tag set D-1' can be considered to be close to the position of the moving tag of the target food material. In the same way, other fixed label sets D-2 ', D-3 ', and D-4 ' are obtained by the same method.
Specifically, in step S5, an intersection is taken for the fixed tag set, for example, for D-1", D-2", D-3 "\8230, and the numbers in the array are intersected to obtain a new array, for example, D = [2] or D = [2,3], where the target fixed tag is number 2, or numbers 2 and 3.
Specifically, in step S6, the determining the position of the target food material according to the position of the target fixed tag includes S61 to S63:
s61, when the target fixed tag is 1, taking the position of the target fixed tag as the position of the target food material;
s62, when the target fixed tag is larger than 1 and smaller than a preset number threshold, taking the middle position of the target fixed tag as the position of the target food material;
and S63, when the target fixed tags are larger than or equal to the preset number threshold, re-responding to the positioning operation of the target food materials.
Illustratively, the number threshold is 4. When D = [2], taking the position of the target fixed tag 2 as the position of the target food material; when D = [2,3], taking the middle position of the target fixed tags 2 and 3 as the position of the target food material; when D = [2,3,4], the target fixed tag 3 is taken as the position of the target food material, and when D = [2,3,4,5], since the obtained target fixed tags are many and the data is inaccurate, re-measurement is required at this time.
Further, after the position of the target food material is obtained, the position of the target food material is presented to a user in a text prompt mode, a voice prompt mode and an image prompt mode, and the user can accurately take the target food material according to the position.
More further, the refrigerator food material positioning method further comprises the following steps:
s7, receiving the intensity of the signal to be detected from the antenna to each fixed tag sent by the reader-writer host when responding to the food material distribution positioning operation;
s8, comparing the intensity of the signal to be detected with a preset standard signal intensity; wherein the standard signal intensity is the signal intensity from the antenna to each fixed tag when no food material is stored in the storage room;
s9, determining the distribution of the food materials in the storage room according to the comparison result.
For example, when a user needs to dissolve the food material distribution in the refrigerator, a food material distribution knowing instruction may be input on a human-computer interaction module (such as a display screen) of the refrigerator, and at this time, the controller responds to a food material distribution positioning operation. For example: the signal strength sent by the antenna 3 to the fixed tag 5 is recorded as RSSI-5-3, if RSSI-5-3= RSSI-S-5-3, it is considered that no food material exists between the antenna 3 and the fixed tag 5, if RSSI-5-3 is constructed as RSSI-S-5-3, it is considered that food material exists between the antenna 3 and the fixed tag 5, and the food material distribution in the refrigerator can be generally depicted through the comparison result of the signal strength values of all the fixed tags acquired by all the antennas.
Compared with the prior art, the refrigerator food material positioning method disclosed by the embodiment of the invention has the advantages that the plurality of fixed tags for reference are arranged in the refrigerator in advance, the antennas are provided with the plurality of paths of antennas arranged at different positions, when the target food material needs to be accurately positioned, the position of the target food material is calculated according to the RSSI data of the mobile tag and the fixed tag of the target food material, which are acquired by the antennas, and the fixed tag is used as a reference object because the position of the fixed tag is unchanged, so that the position of the food material can be accurately positioned, and the accurate positioning of the target food material is realized. In addition, the RSSI values of the antennas corresponding to the fixed tags acquired by the antennas are prestored under the condition of no shielding, and if the RSSI values detected in the subsequent ranging process are smaller than the RSSI values detected when the antennas are not shielded, the fixed tags are considered to be shielded, and the corresponding RSSI data of the antennas corresponding to the fixed electronic tags acquired by the antennas are compared with the corresponding RSSI data under the condition of no shielding, so that the spatial distribution of food materials in the refrigerator can be described, a user can know the distribution condition of the food materials in the refrigerator under the condition of not opening the refrigerator door, and further can know whether the vacant positions exist to place other food materials.
While the foregoing is directed to the preferred embodiment of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made without departing from the spirit and scope of the invention.
Claims (8)
1. A refrigerator, characterized by comprising:
a cabinet serving as a support structure of the refrigerator and having a plurality of storage compartments therein;
the reader-writer comprises a reader-writer host and a plurality of antennas, and the reader-writer transmits or receives radio frequency signals to the RFID label through the antennas so that the RFID label calculates the signal intensity and returns the signal intensity to the reader-writer host through the antennas; the RFID tags comprise a plurality of fixed tags and at least one mobile tag, the fixed tags are electronic tags installed in preset positions of the storage room, and the mobile tags are electronic tags bound with food materials;
the controller is configured to:
responding to the positioning operation of the target food material, and receiving a data signal sent by the reader-writer host; wherein the data signal comprises: the reference signal intensity sent by each fixed tag detected by the antenna and the mobile signal intensity sent by a target mobile tag corresponding to the target food material;
calculating a reference distance from the antenna to each fixed tag according to the reference signal strength, and calculating a moving distance from the antenna to the moving tag according to the moving signal strength;
obtaining a distance difference value between the reference distance and the moving distance corresponding to the same antenna;
integrating the fixed tags corresponding to the reference distances of which the distance difference values meet the preset difference value threshold value into a fixed tag set, and obtaining the fixed tag sets corresponding to the number of the antennas until all the antennas are completely obtained;
acquiring intersection sets of the fixed tag sets corresponding to the number of the antennas to obtain target fixed tags;
determining the position of the target food material according to the position of the target fixed tag;
the determining the position of the target food material according to the position of the target fixed tag comprises the following steps:
when the target fixed tag is 1, taking the position of the target fixed tag as the position of the target food material;
when the target fixed tags are larger than 1 and smaller than a preset number threshold, taking the middle position of the target fixed tags as the position of the target food material;
and when the target fixed tags are larger than or equal to the preset number threshold, re-responding to the positioning operation of the target food materials.
2. The refrigerator of claim 1, wherein the controller is further configured to:
receiving the intensity of a signal to be detected from the antenna to each fixed tag sent by the reader-writer host when responding to the distribution positioning operation of the food materials;
comparing the intensity of the signal to be detected with the intensity of a preset standard signal; wherein the standard signal intensity is the signal intensity from the antenna to each fixed tag when no food material is stored in the storage room;
and determining the distribution of the food materials in the storage chamber according to the comparison result.
3. The refrigerator of claim 1, wherein said calculating a moving distance of the antenna to the mobile tag according to the moving signal strength comprises:
and calculating the moving distance from the antenna to the mobile tag according to the moving distance, the environment attenuation factor and the unit signal strength and a preset tag distance calculation strategy.
4. The refrigerator of claim 1, wherein after determining the location of the target food material according to the location of the target fixed tag, the controller is further configured to:
and presenting the position of the target food material to a user in a text prompt mode, a voice prompt mode and an image prompt mode.
5. A refrigerator food material positioning method is characterized in that a refrigerator comprises a reader-writer, the reader-writer comprises a reader-writer host and a plurality of antennas, and the reader-writer transmits or receives radio frequency signals to an RFID label through the antennas so that the RFID label calculates signal intensity and returns the signal intensity to the reader-writer host through the antennas; the RFID tag comprises a plurality of fixed tags and at least one mobile tag, wherein the fixed tags are electronic tags installed in preset positions of a storage room, and the mobile tags are electronic tags bound with food materials; the refrigerator food material positioning method comprises the following steps:
responding to the positioning operation of the target food material, and receiving a data signal sent by the reader-writer host; wherein the data signal comprises: the reference signal intensity of each fixed tag detected by the antenna and the mobile signal intensity of a target mobile tag corresponding to the target food material;
calculating a reference distance from the antenna to each fixed tag according to the reference signal strength, and calculating a moving distance from the antenna to the moving tag according to the moving signal strength;
obtaining a distance difference value between the reference distance and the moving distance corresponding to the same antenna;
integrating the fixed tags corresponding to the reference distances of which the distance difference values meet the preset difference value threshold value into a fixed tag set, and obtaining the fixed tag sets corresponding to the number of the antennas until all the antennas are obtained;
acquiring intersection sets of the fixed tag sets corresponding to the number of the antennas to obtain target fixed tags;
determining the position of the target food material according to the position of the target fixed tag;
wherein, the determining the position of the target food material according to the position of the target fixed tag comprises:
when the target fixed tag is 1, taking the position of the target fixed tag as the position of the target food material;
when the target fixed tags are larger than 1 and smaller than a preset number threshold, taking the middle position of the target fixed tags as the position of the target food material;
and when the target fixed tags are larger than or equal to the preset number threshold, re-responding to the positioning operation of the target food materials.
6. The method for locating refrigerator food material as claimed in claim 5, further comprising:
receiving the intensity of a signal to be detected from the antenna to each fixed tag sent by the reader-writer host when responding to the distribution positioning operation of the food materials;
comparing the intensity of the signal to be detected with the intensity of a preset standard signal; wherein the standard signal intensity is the signal intensity from the antenna to each fixed tag when no food material is stored in the storage room;
and determining the distribution of the food materials in the storage chamber according to the comparison result.
7. The method for locating refrigerator food material as claimed in claim 5, wherein the calculating the moving distance from the antenna to the mobile tag according to the moving signal strength comprises:
and calculating the moving distance from the antenna to the mobile tag according to the moving distance, the environment attenuation factor and the unit signal strength and a preset tag distance calculation strategy.
8. The method as claimed in claim 5, wherein after determining the position of the target food material according to the position of the target fixed tag, the method further comprises:
and presenting the position of the target food material to a user in a text prompt mode, a voice prompt mode and an image prompt mode.
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| CN114485038A (en) * | 2022-02-11 | 2022-05-13 | 海信（山东）冰箱有限公司 | Refrigerator and food material positioning method and system |
| CN114485037B (en) * | 2022-02-11 | 2024-04-05 | 海信冰箱有限公司 | Refrigerator and food material positioning method thereof |
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| JP2005148188A (en) * | 2003-11-12 | 2005-06-09 | Matsushita Electric Ind Co Ltd | Foodstuff tag, foodstuff tag storage apparatus, and foodstuff management device |
| JP2005221177A (en) * | 2004-02-06 | 2005-08-18 | Toshiba Corp | Household electrical appliance |
| CN101963431B (en) * | 2010-06-29 | 2015-05-27 | 海尔集团公司 | Refrigerator applying radio frequency identification technology |
| CN104732253B (en) * | 2013-12-20 | 2018-01-30 | ***通信集团湖北有限公司 | Positioning identifying method and system and device and middleware based on passive RFID |
| CN105444515A (en) * | 2015-12-11 | 2016-03-30 | 四川长虹电器股份有限公司 | Refrigerator |
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Address after: 528300 No. 8, Rong Gang Road, Ronggui street, Shunde District, Foshan, Guangdong. Applicant after: HISENSE HOME APPLIANCE GROUP Co.,Ltd. Applicant after: Hisense refrigerator Co.,Ltd. Address before: 528300 No. 8, Rong Gang Road, Ronggui street, Shunde District, Foshan, Guangdong. Applicant before: HISENSE HOME APPLIANCE GROUP Co.,Ltd. Applicant before: HISENSE (SHANDONG) REFRIGERATOR Co.,Ltd. |
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