refrigerator

Abstract

The present invention proposes a refrigerator, comprising: a sound pressure acquisition module and a controller, wherein the sound pressure acquisition module is used to collect the sound pressure signal when the refrigerator is running; the controller is configured to: obtain the sound pressure signal; filter the sound pressure signal according to a preset algorithm model to obtain a frequency spectrum corresponding to the sound pressure signal, wherein the preset algorithm model includes an A-weighted filtering algorithm model and a one-third octave filtering algorithm model; determine whether the refrigerator resonates based on the frequency band information in the frequency spectrum. The present invention collects the sound pressure signal when the refrigerator is running through a sound pressure sensor, and combines a variety of signal processing technologies such as A-weighted filtering and one-third octave filtering to accurately determine whether there is a resonance phenomenon in the operation of the refrigerator, so as to adjust the operating state of the resonance source, effectively avoid the generation of resonance noise, and improve the user experience and satisfaction.

Description

Technical Field

[0001] The present invention relates to the technical field of refrigeration equipment, and in particular to a refrigerator. Background Art

[0002] During the use of refrigerators, defects may exist in refrigerator parts produced in batches, resulting in quality problems for individual refrigerators, which in turn cause resonance noise in the refrigerator, affecting user experience and possibly resulting in higher after-sales service costs. In the prior art, a sound sensor (such as a microphone) is usually used to monitor the sound generated during the operation of the refrigerator in real time, and the collected data is analyzed to determine the optimal operating state of the refrigerator components at different speeds, thereby effectively adjusting the speed of the refrigerator components to avoid abnormal noise.

[0003] However, if resonance occurs, the refrigerator will produce pure tone noise of a single frequency, which is more easily perceived by users even under the same sound pressure level. The noise detection method in the prior art has a low recognition rate for resonance noise and a poor noise reduction effect, which reduces the user experience and satisfaction. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art.

[0005] To this end, an object of the present invention is to provide a refrigerator, comprising: a sound pressure acquisition module, used to collect a sound pressure signal when the refrigerator is running; a controller, wherein the controller is configured to: obtain the sound pressure signal;

[0006] The sound pressure signal is filtered according to a preset algorithm model to obtain a frequency spectrum corresponding to the sound pressure signal, wherein the preset algorithm model includes an A-weighted filtering algorithm model and a one-third octave band filtering algorithm model; and whether the refrigerator has resonance is determined based on frequency band information in the frequency spectrum.

[0007] According to the refrigerator of the embodiment of the present invention, by collecting the sound pressure signal of the refrigerator during operation through the sound pressure sensor, and combining various signal processing technologies such as A-weighted filtering and one-third octave band filtering, it is possible to accurately determine whether there is a resonance phenomenon during the operation of the refrigerator, so as to adjust the operating state of the resonance source, effectively avoid the generation of resonance noise, and improve the user experience and satisfaction.

[0008] In some embodiments, when determining whether the refrigerator resonates based on the frequency band information in the frequency range spectrum, the controller is configured to: obtain the sound pressure level corresponding to each frequency band in the frequency range spectrum; determine the sound pressure coefficient corresponding to each frequency band based on the sound pressure level corresponding to each frequency band; when there is a target frequency band in each of the frequency bands, determine that the refrigerator resonates, wherein the sound pressure level corresponding to the target frequency band is greater than a preset sound pressure level threshold, and its corresponding sound pressure coefficient is greater than a preset sound pressure coefficient threshold.

[0009] In some embodiments, when determining the sound pressure coefficient corresponding to each frequency band based on the sound pressure level corresponding to each frequency band, the controller is further configured to: determine the sound pressure value corresponding to each frequency band based on the sound pressure level corresponding to each frequency band; determine the sound pressure coefficient corresponding to each frequency band based on the sound pressure value corresponding to each frequency band.

[0010] In some embodiments, when the sound pressure value corresponding to each frequency band is determined based on the sound pressure level corresponding to each frequency band, the specific formula is:

[0011]

[0012] Among them, W i Indicates the sound pressure value corresponding to each frequency band, L i Indicates the sound pressure level corresponding to each frequency band.

[0013] In some embodiments, when the sound pressure coefficient corresponding to each frequency band is determined based on the sound pressure value corresponding to each frequency band, the specific formula is:

[0014] PR i =10*log{2W i / (W i+1 +W i-1 )};

[0015] Among them, PR i represents the sound pressure coefficient corresponding to each frequency band, W i represents the sound pressure value corresponding to each frequency band, W i+1 , W i-1 Respectively represent the sound pressure values ​​corresponding to the adjacent frequency bands of each of the frequency bands.

[0016] In some embodiments, after determining that the refrigerator has resonance, the controller is configured to: adjust the operating state of a target component in the refrigerator that generates resonance to eliminate the resonance.

[0017] In some embodiments, before adjusting the operating state of the target component that generates resonance in the refrigerator, the controller is configured to: perform Fourier transform on the sound pressure signal after A-weighted filtering to obtain a sound pressure spectrum corresponding to the sound pressure signal after filtering; and determine the target component based on the sound pressure spectrum.

[0018] In some embodiments, when determining the target component according to the sound pressure spectrum, the controller is further configured to: obtain a frequency corresponding to a maximum peak in the sound pressure spectrum; and determine the target component according to the frequency corresponding to the maximum peak.

[0019] In some embodiments, when determining the target component based on the frequency corresponding to the maximum peak, the controller is configured to: obtain the operating frequency of each component of the refrigerator; compare the frequency corresponding to the maximum peak with the operating frequency of each component of the refrigerator; when the frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator or the corrected frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator, determine that any component is the target component, wherein the corrected frequency is a correction value of the frequency corresponding to the maximum peak within a preset frequency correction range.

[0020] In some embodiments, when adjusting the operating state of the target component generating resonance in the refrigerator, the controller is configured to adjust the rotation speed of the target component according to a preset interval time and a preset adjustment step until there is no resonance.

[0021] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0023] Figure 1 is a schematic structural diagram of a refrigerator according to an embodiment of the present invention;

[0024] Figure 2 is a structural schematic diagram of a refrigerator according to another embodiment of the present invention;

[0025] Figure 3 is a schematic structural diagram of a refrigeration system according to an embodiment of the present invention;

[0026] Figure 4 is a schematic diagram of the flow direction of the refrigerant during refrigeration according to an embodiment of the present invention;

[0027] Figure 5is a schematic diagram of the structure of a controller according to an embodiment of the present invention;

[0028] Figure 6 is a structural schematic diagram of a refrigerator according to another embodiment of the present invention;

[0029] Figure 7 is a schematic diagram of a frequency spectrum of another embodiment of the present invention;

[0030] Figure 8 is a schematic diagram of a sound pressure spectrum of another embodiment of the present invention;

[0031] Fig. 9 is a flow chart of a method for controlling a refrigerator according to another embodiment of the present invention;

[0032] Fig.10 is a schematic diagram of a process of determining whether a refrigerator has resonance based on frequency band information in a frequency spectrum according to an embodiment of the present invention;

[0033] Fig.11 It is a schematic diagram of a flow chart of determining a target component according to a frequency corresponding to a maximum peak value according to an embodiment of the present invention. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0035] In the description of the present invention, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0036] The terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0037] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0038] Combination Figure 1 and Figure 6 As shown, the refrigerator 10 of this embodiment includes but is not limited to being approximately rectangular in shape, and the refrigerator 10 includes a box body 100 defining a storage space and a plurality of door bodies 200 disposed at the opening of the box body 100, wherein Figure 2 As shown, the door body 200 includes a door body shell 210 located outside the box body 100, a door body inner liner 220 located inside the box body 100, an upper end cover 230, a lower end cover 240, and an insulation layer located between the door body shell 210, the door body inner liner 220, the upper end cover 230, and the lower end cover 240; generally, the insulation layer is filled with foam. The box body 100 is provided with a chamber, wherein the chamber includes a component storage chamber for placing components in the refrigerator 10, such as a compressor, a fan, etc., and also includes a storage space for storing food and medicine, etc.

[0039] like Figure 3 As shown, Figure 3It is a structural schematic diagram of the refrigeration system in the refrigerator 10 provided in an embodiment of the present invention, and the refrigeration system includes a compressor 1, a condenser 2, an anti-condensation tube 3, a drying filter 4, a pressure reducer 5, an evaporator 6 and a gas-liquid separator 7. The working process of the refrigeration system includes a compression process, a condensation process, a throttling process and an evaporation process. Among them, the compression process is: plug in the power cord of the refrigerator 10, when the contacts of the thermostat are connected, the compressor 1 starts to work, and the low-temperature and low-pressure refrigerant is sucked into the compressor 1, and is compressed into a high-temperature and high-pressure superheated gas in the cylinder of the compressor 1 and then discharged to the condenser 2; the condensation process is: the high-temperature and high-pressure refrigerant gas dissipates heat through the condenser 2, the temperature continues to drop, and is gradually cooled to a saturated vapor of normal temperature and high pressure, and is further cooled to a saturated liquid, and the temperature no longer drops. The temperature at this time is called the condensation temperature, and the pressure of the refrigerant remains almost unchanged during the entire condensation process; the throttling process is: after condensation, the refrigerant gas After the moisture and impurities are filtered out by the drying filter 4, the saturated liquid refrigerant flows into the pressure reducer 5 (such as a capillary tube), through which the refrigerant is throttled and depressurized, and the refrigerant becomes wet steam at room temperature and low pressure; the evaporation process is: the wet steam at room temperature and low pressure begins to absorb heat and vaporize in the evaporator 6, which not only reduces the temperature of the evaporator and its surroundings, but also turns the refrigerant into a low-temperature, low-pressure gas. The refrigerant coming out of the evaporator 6 passes through the gas-liquid separator 7 and returns to the compressor 1 again. The above process is repeated to transfer the heat in the refrigerator 10 to the air outside the box, thereby achieving the purpose of refrigeration. The flow direction of the refrigerant can also be seen in Figure 4 shown.

[0040] In addition, the refrigerator 10 is provided with a controller 71 to control the operation of various components in the refrigerator 10 so that the various components of the refrigerator 10 can operate to realize various predetermined functions of the refrigerator 10. Among them, a control device is also attached to the refrigerator 10, and the control device has the function of communicating with the controller 71 using infrared or other communication methods. The control device is used for the user to control the refrigerator 10 in various ways and realize the interaction between the user and the refrigerator 10.

[0041] The present application also provides a hardware structure diagram of a controller 71, such as Figure 5 As shown, the controller 71 includes a processor 83, and optionally, further includes a memory 82 and a communication interface 84 connected to the processor 83. The processor 83, the memory 82 and the communication interface 84 are connected via a bus 81.

[0042] The processor 83 may be a central processing unit 83 (CPU), a general processor 83, a network processor 83 (NP), a digital signal processor 83 (DSP), a microprocessor 83, a microcontroller 83, a programmable logic device (PLD), or any combination thereof. The processor 83 may also be any other device having a processing function, such as a circuit, a device, or a software module. The processor 83 may also include multiple CPUs, and the processor 83 may be a single-core (singleCPU) processor 83 or a multi-core (multiCPU) processor 83. The processor 83 here may refer to one or more devices, circuits, or processing cores for processing data (such as a computer program).

[0043] The memory 82 may be a read-only memory 82 (ROM) or other types of static storage devices that can store static information and, a random access memory 82 (RAM) or other types of dynamic storage devices that can store information and, or an electrically erasable programmable read-only memory 82 (EEPROM), a compact disc read-only memory (CDROM) or other optical disc storage, optical disc storage (including compressed optical disc, laser disc, optical disc, digital versatile disc, Blu-ray disc, etc.), a disk storage medium or other magnetic storage device, or any other medium that can be used to carry or store the desired program code in the form of or data structure and can be accessed by a computer, and the present embodiment of the application does not impose any restrictions on this. The memory 82 may exist independently or be integrated with the processor 83. Among them, the memory 82 may contain computer program code. The processor 83 is used to execute the computer program code stored in the memory 82, so as to realize the control method of the refrigerator 10 provided in the embodiment of the present application.

[0044] The communication interface 84 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc. The communication interface 84 can be a module, a circuit, a transceiver or any device that can achieve communication.

[0045] The bus 81 may be a peripheral component interconnect (PCI) bus 81 or an extended industry standard architecture (EISA) bus 81, etc. The bus 81 may be divided into an address bus 81, a data bus 81, a control bus 81, etc.

[0046] Combine the following Figure 6-Figure 11 A refrigerator and a control method thereof according to an embodiment of the present invention are described.

[0047] In some embodiments, Figure 6 As shown, the refrigerator 10 includes: a sound pressure collection module 11, which is used to collect sound pressure signals when the refrigerator 10 is running.

[0048] In some embodiments, Figure 6 As shown, the refrigerator 10 further includes: a controller 71, and the controller 71 is configured to: obtain a sound pressure signal;

[0049] Filtering the sound pressure signal according to a preset algorithm model to obtain a frequency spectrum corresponding to the sound pressure signal, wherein the preset algorithm model includes an A-weighted filtering algorithm model and a one-third octave band filtering algorithm model;

[0050] It is determined whether the refrigerator 10 has resonance based on the frequency band information in the frequency spectrum.

[0051] Specifically, during the operation of the refrigerator 10, various sounds generated by the refrigerator 10 can be collected by the sound pressure collection module 11 and converted into sound pressure signals, wherein the sound pressure collection module 11 includes but is not limited to a microphone sensor, etc., and the sound pressure collection module 11 can be installed at different positions near components that may generate noise, so as to be able to collect sound pressure signals from different angles.

[0052] Furthermore, after obtaining the sound pressure signal, the sound pressure signal can be filtered based on a preset algorithm model, including A-weighted filtering of the sound pressure signal, that is, weighting the sound pressure signal according to a preset frequency response characteristic to attenuate the low-frequency and high-frequency components, and relatively maintain or enhance the mid-frequency components, so that the measured noise level is closer to the subjective human auditory perception. At the same time, the sound pressure signal after the A-weighted filtering can be subjected to one-third octave filtering, that is, the sound pressure signal after the A-weighted filtering is divided according to one-third octave bands to obtain the frequency spectrum corresponding to the sound pressure signal, so as to facilitate a more detailed analysis of the distribution of the sound pressure signal in different frequency bands.

[0053] Furthermore, it is possible to determine whether the refrigerator 10 resonates based on the frequency band information in the frequency spectrum, including but not limited to determining whether the refrigerator 10 resonates by the sound pressure level corresponding to the frequency band in the frequency spectrum. For example, under normal circumstances, the sound pressure level corresponding to the frequency band in the frequency spectrum is relatively stable or shows a certain trend of change, but there will be no obvious abrupt points or peaks. However, when the refrigerator 10 resonates, there will be a significant increase in the sound pressure level in one or some specific frequency bands, forming an obvious peak.

[0054] According to the refrigerator 10 of the embodiment of the present invention, by collecting the sound pressure signal of the refrigerator 10 during operation through a sound pressure sensor, and combining various signal processing technologies such as A-weighted filtering and one-third octave band filtering, it is possible to accurately determine whether there is a resonance phenomenon during the operation of the refrigerator 10, so as to adjust the operating state of the resonance source, effectively avoid the generation of resonance noise, and improve the user experience and satisfaction.

[0055] In one embodiment of the present invention, when determining whether the refrigerator 10 has resonance based on the frequency band information in the frequency spectrum, the controller 71 is configured to: obtain the sound pressure level corresponding to each frequency band in the frequency spectrum; determine the sound pressure coefficient corresponding to each frequency band based on the sound pressure level corresponding to each frequency band;

[0056] When there is a target frequency band in each frequency band, it is determined that the refrigerator 10 has resonance, wherein the sound pressure level corresponding to the target frequency band is greater than a preset sound pressure level threshold, and the corresponding sound pressure coefficient is greater than a preset sound pressure coefficient threshold.

[0057] Specifically, after obtaining the frequency spectrum corresponding to the sound pressure signal, the controller 71 can extract the numerical value representing the sound intensity of each frequency band from the information of the frequency spectrum, that is, the sound pressure level corresponding to each frequency band, and then determine the sound pressure coefficient corresponding to each frequency band through a preset algorithm based on the sound pressure level corresponding to each frequency band.

[0058] Further, when there is at least one target frequency band in the frequency bands in the frequency spectrum, it means that the current sound is loud enough and has a certain impact on the user, and it can be determined that the refrigerator 10 is in resonance, wherein the sound pressure level corresponding to the target frequency band is greater than the preset sound pressure level threshold, and its corresponding sound pressure coefficient is greater than the preset sound pressure coefficient threshold. It can be understood that the sound pressure level corresponding to the target frequency band is greater than the preset sound pressure level threshold, indicating that the sound pressure level corresponding to the current frequency band is significantly enhanced, and the sound pressure coefficient corresponding to the target frequency band is greater than the preset sound pressure coefficient threshold, indicating that the amplitude of the sound pressure level enhancement is relatively obvious. At this time, it can be determined that the refrigerator 10 is in resonance. It can be understood that by simultaneously determining the sound pressure level corresponding to each frequency band and the sound pressure coefficient corresponding to each frequency band to determine the target frequency band, the accuracy of the target frequency band judgment can be further improved, thereby improving the accuracy of the refrigerator 10 resonance judgment.

[0059] In a specific embodiment, in combination Figure 7 As shown, if the preset sound pressure level threshold is set to 30dB, there are three frequency bands in the frequency spectrum that are greater than the preset sound pressure level threshold. Further, it can be determined whether there is a corresponding frequency band with a sound pressure coefficient greater than the preset sound pressure coefficient threshold in the frequency band greater than the preset sound pressure level threshold. If so, it can be determined that the current frequency band is the target frequency band.

[0060] In one embodiment of the present invention, when determining the sound pressure coefficient corresponding to each frequency band based on the sound pressure level corresponding to each frequency band, the controller 71 is further configured to: determine the sound pressure value corresponding to each frequency band based on the sound pressure level corresponding to each frequency band;

[0061] The sound pressure coefficient corresponding to each frequency band is determined based on the sound pressure value corresponding to each frequency band.

[0062] Specifically, when determining the sound pressure coefficient corresponding to each frequency band based on the sound pressure level corresponding to each frequency band, the sound pressure level corresponding to each frequency band can be first substituted into a preset algorithm to convert the sound pressure level corresponding to each frequency band into a sound pressure value corresponding to each frequency band, and then the sound pressure value corresponding to each frequency band can be substituted into the preset algorithm to determine the sound pressure coefficient corresponding to each frequency band.

[0063] In one embodiment of the present invention, when the sound pressure value corresponding to each frequency band is determined based on the sound pressure level corresponding to each frequency band, the specific formula is:

[0064]

[0065] Among them, W i Indicates the sound pressure value corresponding to each frequency band, L i Indicates the sound pressure level corresponding to each frequency band.

[0066] Specifically, when the sound pressure value corresponding to each frequency band is determined based on the sound pressure level corresponding to each frequency band, the specific formula is as shown in the above formula, wherein W i Indicates the sound pressure value corresponding to each frequency band, L i It represents the sound pressure level corresponding to each frequency band. For example, if i is equal to 1, W1 is the sound pressure value corresponding to the first frequency band, and L1 is the sound pressure level corresponding to the first frequency band; if i is equal to 2, W2 is the sound pressure value corresponding to the second frequency band, and L2 is the sound pressure level corresponding to the second frequency band. By analogy, the sound pressure level and sound pressure value corresponding to each frequency band can be obtained.

[0067] In a specific embodiment, if the sound pressure level corresponding to the first frequency band is 35.3dB, the sound pressure level corresponding to the second frequency band is 32dB, and the sound pressure level corresponding to the third frequency band is 31dB, that is, when L1 is 35.3dB, L2 is 32dB, and L3 is 31dB, the sound pressure value corresponding to the first frequency band is calculated as follows: The sound pressure value corresponding to the second frequency band is calculated as follows: The sound pressure value corresponding to the third frequency band is calculated as follows:

[0068]

[0069] In one embodiment of the present invention, when the sound pressure coefficient corresponding to each frequency band is determined based on the sound pressure value corresponding to each frequency band, the specific formula is:

[0070] PR i =10*log{2W i / (W i+1 +W i-1 )};

[0071] Among them, PR i Indicates the sound pressure coefficient corresponding to each frequency band, W i Indicates the sound pressure value corresponding to each frequency band, W i+1 , W i-1 Respectively represent the sound pressure values ​​corresponding to the adjacent frequency bands of each frequency band.

[0072] Specifically, when the sound pressure coefficient corresponding to each frequency band is determined based on the sound pressure value corresponding to each frequency band, the specific formula is as shown in the above formula, wherein PR i Indicates the sound pressure value corresponding to each frequency band, W i Indicates the sound pressure value corresponding to each frequency band, W i+1 , W i-1 Respectively represent the sound pressure values ​​corresponding to the adjacent frequency bands of each frequency band. For example, if i is equal to 1, then PR i is the sound pressure coefficient corresponding to the first frequency band, W1 is the sound pressure value corresponding to the first frequency band, and W0 and W2 are the sound pressure values ​​corresponding to the adjacent frequency bands of the first frequency band. It should be noted that when W i When there is only one adjacent frequency band, W i+1 , W i-1 One of them is 0. For example, when W1 is the sound pressure value corresponding to the first frequency band, if the frequency band corresponding to W0 does not exist, W0 is 0.

[0073] In one embodiment of the present invention, after determining that the refrigerator 10 has resonance, the controller 71 is configured to adjust the operating state of the target component generating the resonance in the refrigerator 10 to eliminate the resonance.

[0074] Specifically, after determining that the refrigerator 10 is in resonance, the target component that produces the resonance can be determined by analyzing the collected sound pressure signal, and the operating state of the target component can be adjusted, including but not limited to adjusting the rotation speed of the target component. Furthermore, the controller 71 can continuously monitor the resonance of the refrigerator 10 during operation, and change the adjustment strategy in a timely manner until the resonance phenomenon is effectively eliminated.

[0075] In one embodiment of the present invention, before adjusting the operating state of the target component generating resonance in the refrigerator 10, the controller 71 is configured to: perform Fourier transform on the sound pressure signal after the A-weighted filtering process to obtain a sound pressure spectrum corresponding to the sound pressure signal after the filtering process;

[0076] Identify target components based on the sound pressure spectrum.

[0077] Specifically, before adjusting the operating state of the target component that generates resonance in the refrigerator 10, the sound pressure signal after A-weighted filtering can be Fourier transformed to convert the sound pressure signal in the time domain into a sound pressure signal in the frequency domain, that is, the sound pressure signal that changes with time is converted into a superposition curve of a series of sine waves (or cosine waves) of different frequencies, so as to obtain the sound pressure spectrum corresponding to the sound pressure signal after filtering.

[0078] Furthermore, the target component may be determined based on the sound pressure spectrum, including but not limited to determining the target component based on peak features in the sound pressure spectrum.

[0079] In one embodiment of the present invention, Figure 8 As shown, when determining the target component according to the sound pressure spectrum, the controller 71 is further configured to: obtain the frequency corresponding to the maximum peak in the sound pressure spectrum; and determine the target component according to the frequency corresponding to the maximum peak.

[0080] Specifically, when determining the target component according to the sound pressure spectrum, the controller 71 can scan the entire sound pressure spectrum and find the largest peak value (such as Figure 8 0.00103714 as shown), and record the frequency corresponding to the largest peak (such as Figure 8 101.1 Hz), further, according to the frequency corresponding to the maximum peak (such as Figure 8 101.1 Hz) as shown in the figure to determine the target component, including but not limited to matching the frequency corresponding to the maximum peak with the operating frequencies of all components during the operation of the refrigerator 10, thereby determining the target component.

[0081] In one embodiment of the present invention, when determining the target component according to the frequency corresponding to the maximum peak, the controller 71 is configured to: obtain the operating frequency of each component of the refrigerator 10; compare the frequency corresponding to the maximum peak with the operating frequency of each component of the refrigerator 10; when the frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator 10 or the corrected frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator 10, determine that any component is the target component, wherein the corrected frequency is a correction value of the frequency corresponding to the maximum peak within a preset frequency correction range.

[0082] Specifically, when determining the target component according to the frequency corresponding to the maximum peak, the controller 71 can obtain the operating frequency of each component of the refrigerator 10 through the corresponding sensor, and compare them one by one with the frequency corresponding to the maximum peak in the sound pressure spectrum. When the frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator 10, or the operating frequency obtained by multiplying the operating frequency of any component of the refrigerator 10 by a certain multiple is consistent with the correction frequency corresponding to the maximum peak, the current component can be determined as the target component. The correction frequency corresponding to the maximum peak is the correction value of the frequency corresponding to the maximum peak within the preset frequency correction range. For example, when the frequency corresponding to the maximum peak is 101.1 Hz, and the operating frequency of any component of the refrigerator 10 is 20 Hz, if the preset frequency correction range is 0 to 5 Hz, the correction frequency corresponding to the maximum peak can be 100 Hz.

[0083] In one embodiment of the present invention, when adjusting the operating state of the target component generating resonance in the refrigerator 10, the controller 71 is configured to adjust the rotation speed of the target component according to a preset interval time and a preset adjustment step until there is no resonance.

[0084] Specifically, after determining the target component that generates resonance, the rotation speed of the target component can be gradually adjusted according to the preset interval time and the preset adjustment step length until the resonance phenomenon is eliminated. For example, when adjusting the rotation speed of the target component, the preset interval time and the preset adjustment step length can be determined according to the severity of the resonance phenomenon and the type of the target component and other information to avoid over-adjustment or under-adjustment. For example, if the target component is determined to be a compressor, the rotation speed of the compressor can be controlled to be reduced by 100 revolutions per minute, and after running for 10 minutes, it is determined whether the resonance phenomenon still exists. If the resonance phenomenon still exists, the rotation speed of the compressor can be controlled to increase by 50 revolutions per minute, and the rotation speed of the compressor is continuously adjusted at intervals of 10 minutes until the resonance phenomenon is eliminated.

[0085] According to the refrigerator 10 of the embodiment of the present invention, the sound pressure signal of the refrigerator 10 during operation can be collected by a sound pressure sensor, and combined with various signal processing technologies such as A-weighted filtering, one-third octave band filtering, and sound pressure coefficient calculation, it can be accurately determined whether there is a resonance phenomenon during the operation of the refrigerator 10, so as to adjust the operating state of the resonance source, effectively avoid the generation of resonance noise, and improve the user experience and satisfaction. Furthermore, after determining that there is a resonance phenomenon, the sound pressure signal can be Fourier transformed to obtain a sound pressure spectrum, so as to determine the resonance source according to the information of the sound pressure spectrum, and the rotation speed of the resonance source can be accurately adjusted according to a preset adjustment strategy, so that the resonance source can accurately avoid the resonance point and avoid the generation of resonance noise. At the same time, it can reduce the problem of equipment damage caused by resonance, avoid unnecessary maintenance costs, and further improve the user experience and satisfaction.

[0086] Reference below Fig. 9 A control method of a refrigerator according to an embodiment of the present invention is described.

[0087] like Fig. 9 As shown, the refrigerator control method of the embodiment of the present invention at least includes steps S1 to S3.

[0088] Step S1, obtaining a sound pressure signal when the refrigerator is running.

[0089] Step S2, filtering the sound pressure signal according to a preset algorithm model to obtain a frequency spectrum corresponding to the sound pressure signal, wherein the preset algorithm model includes an A-weighted filtering algorithm model and a one-third octave band filtering algorithm model.

[0090] Step S3: determining whether the refrigerator has resonance based on the frequency band information in the frequency spectrum.

[0091] In some embodiments, Fig.10 As shown, when determining whether the refrigerator resonates based on the frequency band information in the frequency spectrum, it specifically includes: obtaining the sound pressure level corresponding to each frequency band in the frequency spectrum; determining the sound pressure coefficient corresponding to each frequency band based on the sound pressure level corresponding to each frequency band; when there is a target frequency band in each frequency band, determining that the refrigerator resonates, wherein the sound pressure level of the target frequency band is greater than a preset sound pressure level threshold, and its corresponding sound pressure coefficient is greater than a preset sound pressure coefficient threshold.

[0092] In some embodiments, when determining the sound pressure coefficient corresponding to each frequency band based on the sound pressure level corresponding to each frequency band, it specifically includes: determining the sound pressure value corresponding to each frequency band based on the sound pressure level corresponding to each frequency band; determining the sound pressure coefficient corresponding to each frequency band based on the sound pressure value corresponding to each frequency band.

[0093] In some embodiments, when the sound pressure value corresponding to each frequency band is determined based on the sound pressure level corresponding to each frequency band, the specific formula is:

[0094]

[0095] Among them, W i Indicates the sound pressure value corresponding to each frequency band, L i Indicates the sound pressure level corresponding to each frequency band.

[0096] In some embodiments, when the sound pressure coefficient corresponding to each frequency band is determined based on the sound pressure value corresponding to each frequency band, the specific formula is:

[0097] PR i =10*log{2W i / (W i+1 +W i-1 )};

[0098] Among them, PR i Indicates the sound pressure coefficient corresponding to each frequency band, W i Indicates the sound pressure value corresponding to each frequency band, W i+1 , W i-1 Respectively represent the sound pressure values ​​corresponding to the adjacent frequency bands of each frequency band.

[0099] In some embodiments, after determining that the refrigerator has resonance, the method further includes: adjusting the operating state of a target component in the refrigerator that generates resonance to eliminate the resonance.

[0100] In some embodiments, before adjusting the operating state of the target component that generates resonance in the refrigerator, it also includes: performing Fourier transform on the sound pressure signal after A-weighted filtering to obtain a sound pressure spectrum corresponding to the sound pressure signal after filtering; and determining the target component according to the sound pressure spectrum.

[0101] In some embodiments, when determining the target component according to the sound pressure spectrum, it specifically includes: obtaining the frequency corresponding to the maximum peak in the sound pressure spectrum; and determining the target component according to the frequency corresponding to the maximum peak.

[0102] In some embodiments, Fig.11 As shown, when determining the target component according to the frequency corresponding to the maximum peak, the controller is configured to: obtain the operating frequency of each component of the refrigerator; compare the frequency corresponding to the maximum peak with the operating frequency of each component of the refrigerator; when the frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator or the corrected frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator, determine that any component is the target component, wherein the corrected frequency is a correction value of the frequency corresponding to the maximum peak within a preset frequency correction range.

[0103] In some embodiments, when adjusting the operating state of a target component that generates resonance in a refrigerator, it specifically includes: adjusting the rotation speed of the target component according to a preset interval time and a preset adjustment step length until there is no resonance.

[0104] According to the control method of the refrigerator of the embodiment of the present invention, by collecting the sound pressure signal of the refrigerator during operation, and combining various signal processing technologies such as A-weighted filtering, one-third octave band filtering, and sound pressure coefficient calculation, it is possible to accurately determine whether there is a resonance phenomenon during the operation of the refrigerator, so as to adjust the operating state of the resonance source, effectively avoid the generation of resonance noise, and improve the user experience and satisfaction. Furthermore, after determining that there is a resonance phenomenon, the sound pressure signal can be Fourier transformed to obtain a sound pressure spectrum, so as to determine the resonance source according to the information of the sound pressure spectrum, and the rotation speed of the resonance source can be accurately adjusted according to a preset adjustment strategy, so that the resonance source can accurately avoid the resonance point and avoid the generation of resonance noise. At the same time, it can reduce the problem of equipment damage caused by resonance, avoid unnecessary maintenance costs, and further improve the user experience and satisfaction.

[0105] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example.

[0106] Although the embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A refrigerator, characterized in that: include: A sound pressure collection module, used to collect sound pressure signals when the refrigerator is running; A controller, the controller being configured to: Acquiring the sound pressure signal; Filtering the sound pressure signal according to a preset algorithm model to obtain a frequency spectrum corresponding to the sound pressure signal, wherein the preset algorithm model includes an A-weighted filtering algorithm model and a one-third octave band filtering algorithm model; It is determined whether the refrigerator has resonance based on frequency band information in the frequency spectrum.

2. The refrigerator according to claim 1, characterized in that: When determining whether the refrigerator has resonance based on the frequency band information in the frequency spectrum, the controller is configured to: Obtaining the sound pressure level corresponding to each frequency band in the frequency spectrum; Determine the sound pressure coefficient corresponding to each of the frequency bands based on the sound pressure level corresponding to each of the frequency bands; When there is a target frequency band in each of the frequency bands, it is determined that the refrigerator is in resonance, wherein the sound pressure level corresponding to the target frequency band is greater than a preset sound pressure level threshold, and the corresponding sound pressure coefficient is greater than a preset sound pressure coefficient threshold.

3. The refrigerator according to claim 2, characterized in that: When determining the sound pressure coefficient corresponding to each of the frequency bands based on the sound pressure level corresponding to each of the frequency bands, the controller is further configured to: Determine the sound pressure value corresponding to each of the frequency bands based on the sound pressure level corresponding to each of the frequency bands; The sound pressure coefficient corresponding to each of the frequency bands is determined based on the sound pressure value corresponding to each of the frequency bands.

4. The refrigerator according to claim 3, characterized in that: When the sound pressure value corresponding to each frequency band is determined based on the sound pressure level corresponding to each frequency band, the specific formula is: Among them, W i Indicates the sound pressure value corresponding to each frequency band, L i Indicates the sound pressure level corresponding to each frequency band.

5. The refrigerator according to claim 3, characterized in that: When the sound pressure coefficient corresponding to each frequency band is determined based on the sound pressure value corresponding to each frequency band, the specific formula is: PR i =10*log{2W i / (W i+1 +W i-1 )}; Among them, PR i represents the sound pressure coefficient corresponding to each frequency band, W i represents the sound pressure value corresponding to each frequency band, W i+1 , W i-1 Respectively represent the sound pressure values ​​corresponding to the adjacent frequency bands of each of the frequency bands.

6. The refrigerator according to claim 2, characterized in that: After determining that the refrigerator has resonance, the controller is configured to: The operating state of the target component generating resonance in the refrigerator is adjusted to eliminate the resonance.

7. The refrigerator according to claim 6, characterized in that: Before adjusting the operating state of the target component generating resonance in the refrigerator, the controller is configured to: Performing Fourier transformation on the sound pressure signal after A-weighted filtering to obtain a sound pressure spectrum corresponding to the sound pressure signal after filtering; The target component is determined according to the sound pressure spectrum.

8. The refrigerator according to claim 7, characterized in that: When determining the target component according to the sound pressure spectrum, the controller is further configured to: Obtaining the frequency corresponding to the maximum peak in the sound pressure spectrum; The target component is determined according to the frequency corresponding to the maximum peak value.

9. The refrigerator according to claim 8, characterized in that: When determining the target component according to the frequency corresponding to the maximum peak value, the controller is configured to: Obtaining the operating frequency of each component of the refrigerator; Comparing the frequency corresponding to the maximum peak value with the operating frequencies of various components of the refrigerator; When the frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator or the correction frequency corresponding to the maximum peak is an integer multiple of the operating frequency of any component of the refrigerator, any component is determined to be the target component, wherein the correction frequency is a correction value of the frequency corresponding to the maximum peak within a preset frequency correction range.

10. The refrigerator according to claim 6, characterized in that: When adjusting the operating state of the target component generating resonance in the refrigerator, the controller is configured to: According to a preset interval time and a preset adjustment step length, the rotation speed of the target component is adjusted until there is no resonance.

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