Cookware material identification method and kitchen range linkage method and device based on cookware material

Abstract

The invention relates to a cookware material identification method and a kitchen range linkage method and device based on cookware materials, and is applied to the field of intelligent electrical appliances, and the cookware material identification method comprises the following steps: obtaining transverse wave velocities and longitudinal wave velocities generated when lasers with different wavelengths are hit on a to-be-identified cookware; determining a longitudinal wave attenuation coefficient and a transverse wave attenuation coefficient according to the ratio of the transverse wave velocity to the longitudinal wave velocity; and according to the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient, identifying the material of the to-be-identified cookware in a preset material parameter library. According to the application, the accuracy of identifying the material of the cookware is improved, so that a corresponding range hood and stove linkage effect is realized.

Description

Technical Field

[0001] This application relates to the field of smart appliances, and in particular to a method for identifying cookware material, a method and device for linking cookware material with range hood and stove. Background Technology

[0002] With the improvement of people's living standards and the promotion and popularization of technologies such as the Internet, big data, artificial intelligence, and voice interaction, more and more traditional lifestyles are gradually changing, and the use of home appliances is gradually moving towards intelligence. While bringing more convenience to users, the functions of various home appliances are also becoming more diversified. Range hoods are essential appliances for people to remove cooking fumes, and kitchen appliances with range hood and stove linkage functions have become increasingly popular in recent years.

[0003] However, these interconnected kitchen appliances cannot synchronize the operation modes of cookware and corresponding range hoods and cooktops, resulting in a low level of intelligence. Furthermore, they typically rely on pre-installed chips within the appliances, which cannot accommodate multiple cookware made of different materials. Therefore, there is an urgent need to improve the accuracy of cookware material identification to achieve corresponding synchronized operation between the range hood and cooktop.

[0004] There is currently no effective solution to the problem of how to improve the accuracy of identifying cookware materials in order to achieve the corresponding linkage effect between the range hood and the stove. Summary of the Invention

[0005] This embodiment provides a cookware material identification method, a range hood and stove linkage method and device based on cookware material, to solve the problem in related technologies of how to improve the accuracy of cookware material identification in order to achieve the corresponding range hood and stove linkage effect.

[0006] Firstly, this embodiment provides a method for identifying the material of a cookware, the method comprising:

[0007] The transverse and longitudinal wave velocities generated when lasers of different wavelengths strike a cookware to be identified are obtained.

[0008] The longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient are determined based on the ratio of the transverse wave velocity to the longitudinal wave velocity.

[0009] Based on the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient, the material of the cookware to be identified is determined from a preset material parameter library.

[0010] In some embodiments, obtaining the transverse wave velocity and longitudinal wave velocity generated by lasers of different wavelengths striking the cookware to be identified includes: obtaining the longitudinal wave parameters of the longitudinal wave excited by the laser penetrating the cookware to be identified, and calculating the longitudinal wave velocity corresponding to the longitudinal wave based on the longitudinal wave parameters.

[0011] The surface wave parameters of the surface wave excited by the laser propagating inside the cookware to be identified are obtained. Based on the surface wave parameters and the preset ratio of surface wave to transverse wave, the transverse wave velocity corresponding to the surface wave is calculated.

[0012] In some embodiments, determining the P-wave attenuation coefficient and the S-wave attenuation coefficient based on the ratio of the S-wave velocity to the P-wave velocity includes:

[0013] The longitudinal wave waveform signal generated by the laser penetrating the cookware to be identified is subjected to bandpass filtering;

[0014] According to the preset transformation method, the longitudinal wave waveform signal after bandpass filtering is analyzed to obtain the longitudinal wave envelope signal;

[0015] Based on a preset fitting strategy, the longitudinal wave envelope signal is fitted by combining the ratio of the transverse wave velocity to the longitudinal wave velocity to obtain the longitudinal wave attenuation coefficient.

[0016] In some embodiments, determining the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient based on the ratio of the transverse wave velocity to the longitudinal wave velocity further includes:

[0017] The surface wave waveform signal excited by the laser propagating inside the cookware to be identified is subjected to bandpass filtering;

[0018] According to the preset transformation method, the surface wave waveform signal after bandpass filtering is analyzed to obtain the surface wave envelope signal;

[0019] Based on a preset fitting strategy, the surface wave envelope signal is fitted by combining the ratio of the shear wave velocity to the longitudinal wave velocity to obtain the shear wave attenuation coefficient.

[0020] Secondly, this embodiment provides a method for linking a cooktop and range hood based on the material of the cookware, the method comprising:

[0021] Obtain the material of the cookware to be identified based on the cookware material identification method of the first aspect;

[0022] In a preset material library, the material of the cookware to be identified is matched to obtain the target material;

[0023] Based on the target material, determine the cooking scenario of the cookware to be identified;

[0024] Based on the cooking scenario, the angle of the baffle plate in the range hood, the fan speed of the range hood, and the firepower status of the stove are determined.

[0025] In some embodiments, determining the angle of the baffle plate in the range hood, the fan speed of the range hood, and the firepower status of the stove based on the cooking scenario includes:

[0026] Obtain the quantity of the cookware to be identified;

[0027] If it is determined that there are at least two cookwares to be identified, the priority of the cookwares to be identified is determined according to the cooking scenario of the cookwares to be identified;

[0028] Based on the priority, at least two cookwares to be identified are determined, and the corresponding first guide plate angles are determined.

[0029] The method described in some of these embodiments further includes:

[0030] If it is determined that the number of cookware to be identified is a single piece, the location of the cookware to be identified is determined to be the cooking side;

[0031] Determine the angle of the second deflector corresponding to the cooking side.

[0032] Thirdly, this embodiment provides a range hood and cooktop linkage device based on cookware material. The device includes: a cookware material recognition component, a controller, a range hood, and a cooktop; the controller is connected to the range hood, the cooktop, and the cookware material recognition component.

[0033] The cookware material identification component includes a laser transceiver module and a piezoelectric acoustic wave receiving module; the laser transceiver module is used to emit lasers of different wavelengths to the cookware to be identified; the piezoelectric acoustic wave receiving module is used to receive the longitudinal waves excited by the laser penetrating the cookware to be identified, as well as the surface waves caused by the laser propagating inside the cookware to be identified.

[0034] The controller is used to execute the cookware material identification method described in the first aspect, and to execute the cookware material-based range hood and stove linkage method described in the second aspect.

[0035] Fourthly, this embodiment provides a method for linking a range hood and a cooktop, for use in a range hood and cooktop linkage system, the system including a range hood, a cooktop, a cookware, a laser transceiver module, a piezoelectric acoustic wave receiving module, and a controller;

[0036] The method includes:

[0037] The laser transceiver module emits lasers of different wavelengths into the cookware;

[0038] The piezoelectric acoustic wave receiving module receives longitudinal waves and surface waves formed by lasers of different wavelengths striking the cookware;

[0039] The controller determines the cookware material based on the longitudinal wave and the surface wave; and generates range hood control signals and stove control signals based on the cookware material.

[0040] The range hood operates in response to the range hood control signal, according to the guide vane angle and fan speed carried in the range hood control signal;

[0041] The stove operates in response to the stove control signal and according to the stove firepower status carried in the stove control signal.

[0042] Fifthly, this embodiment provides a smart appliance that employs the cookware material identification method as described in the first aspect, and executes the range hood and gas stove linkage method based on cookware material as described in the second aspect; the smart appliance is either a range hood or a gas stove.

[0043] Compared with related technologies, the cookware material identification method, cooktop-range hood linkage method, and device provided in this embodiment obtain the transverse and longitudinal waves reflected by the cookware by emitting lasers of different wavelengths onto the cookware. Based on the ratio of the transverse wave velocity to the longitudinal wave velocity, the attenuation coefficients of the longitudinal and longitudinal waves are calculated, thereby matching the corresponding cookware material. This method avoids temperature interference and improves the accuracy of determining the cookware material characteristics by using the ratio of the two wave beams.

[0044] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0045] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0046] Figure 1 This is a hardware structure block diagram of the terminal for the cookware material identification method provided in the embodiments of this application;

[0047] Figure 2 This is a flowchart of the cookware material identification method provided in the embodiments of this application;

[0048] Figure 3 This is an analytical diagram of the wave propagation path provided in an embodiment of this application;

[0049] Figure 4 This is a schematic diagram of sound wave reception provided in an embodiment of this application;

[0050] Figure 5 This is a flowchart for determining the longitudinal wave velocity provided in an embodiment of this application;

[0051] Figure 6 This is a flowchart for determining the transverse wave velocity provided in an embodiment of this application;

[0052] Figure 7 This is a flowchart of the attenuation coefficient acquisition method provided in the embodiments of this application;

[0053] Figure 8 This is a flowchart of the cookware detection and control provided in the embodiments of this application;

[0054] Figure 9 This is a schematic diagram of the range hood and gas stove provided in this specific embodiment;

[0055] Figure 10 This is a schematic diagram showing the positions of the laser transceiver module and the PZT array provided in this specific embodiment;

[0056] Figure 11 This is a schematic diagram of the range hood and gas stove provided in this specific embodiment;

[0057] Figure 12 This is a flowchart of the cookware material identification and linkage control method provided in this specific embodiment. Detailed Implementation

[0058] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0059] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to these processes, methods, products, or devices. Words such as “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. Normally, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects.

[0060] The method embodiments provided in this example can be executed on a terminal, computer, or similar computing device. For example, it can run on a terminal. Figure 1 This is a hardware structure block diagram of the terminal for the cookware material identification method provided in this application embodiment. For example... Figure 1 As shown, a terminal may include one or more ( Figure 1 Only one is shown in the diagram. A processor 102 and a memory 104 for storing data are also included. The processor 102 may be, but is not limited to, a microprocessor (MCU) or a programmable logic device (FPGA). The terminal may also include a transmission device 106 for communication functions and an input / output device 108. Those skilled in the art will understand that… Figure 1 The structure shown is for illustrative purposes only and does not limit the structure of the terminal described above. For example, the terminal may also include components that are larger than... Figure 1 The more or fewer components shown, or having the same Figure 1 The different configurations shown are illustrated.

[0061] The memory 104 can be used to store computer programs, such as application software programs and modules, like the computer program corresponding to the cookware material identification method in this embodiment. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, thereby implementing the above-described method. The memory 104 may include high-speed random access memory, and may also include non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some instances, the memory 104 may further include memory remotely located relative to the processor 102, and these remote memories can be connected to the terminal via a network. Examples of such networks include, but are not limited to, the Internet, corporate intranets, local area networks, mobile communication networks, and combinations thereof.

[0062] The transmission device 106 is used to receive or send data via a network. This network includes a wireless network provided by the terminal's communication provider. In one example, the transmission device 106 includes a Network Interface Controller (NIC), which can connect to other network devices via a base station to communicate with the Internet. In another example, the transmission device 106 can be a Radio Frequency (RF) module used for wireless communication with the Internet.

[0063] Currently, products that link range hoods and cooktops only involve basic linkages such as starting and stopping, and cannot link cookware to preset the working modes of the range hood and cooktop, resulting in a low level of intelligence.

[0064] On the other hand, these bundled products often have built-in chips in specific models from certain manufacturers, which cannot be adapted to or compatible with multiple materials. Furthermore, different users use different cookware, which has different heat resistance and smoke production. Generally, users have at least two main categories of cookware: those for stir-frying and those for steaming. Although some manufacturers use built-in radio frequency chips to identify cookware, they still cannot identify cookware that does not have pre-built-in chips, thus affecting the promotion of smart cooking scene presets or automatic cooking.

[0065] Therefore, this application provides a detection device that can automatically identify multiple sets of cookware materials without the need for a built-in chip. The detection device includes a laser transceiver module and an acoustic wave receiving module. The laser transceiver module emits lasers of different wavelengths to the cookware, so that the acoustic wave receiving module receives the different acoustic waves generated at the cookware by the different wavelengths of laser light. Furthermore, the device includes a controller that implements a cookware material identification method. This method utilizes the different absorption and responses of different materials to different wavelengths of pulsed light, the differences in the ratio of longitudinal and transverse waves excited, and the differences in absorption and filtering to determine the material of the cookware, thereby achieving non-contact detection of the cookware material.

[0066] Meanwhile, the detection device can also identify the material of the cookware and automatically set preset working conditions for the stove and range hood to facilitate intelligent cooking. This allows the range hood and stove to automatically start to the optimal mode according to the material of the cookware, providing users with a better cooking experience and improving scene adaptability.

[0067] Specifically, this embodiment provides a method for identifying the material of cookware. Figure 2 This is a flowchart of the cookware material identification method provided in the embodiments of this application, such as... Figure 2 As shown, the process includes the following steps:

[0068] Step S210: Obtain the transverse wave velocity and longitudinal wave velocity generated when lasers of different wavelengths strike the cookware to be identified.

[0069] In cases where it is necessary to determine the material of the cookware to be identified, lasers of different wavelengths need to be emitted to the cookware. When lasers of different wavelengths act on the cookware, two types of waves are generated inside the cookware. One wave penetrates the cookware, forming a longitudinal wave, while the other wave propagates within the cookware, forming a transverse wave.

[0070] Figure 3 This is an analytical diagram of the wave propagation path provided in an embodiment of this application. (Reference) Figure 3 A laser beam is excited by a laser transceiver module and directed to the cookware to be identified, generating P-waves (longitudinal waves) and S-waves (transverse waves) inside the cookware. The P-wave then penetrates the cookware and converts into L-waves at the air-cookware interface; simultaneously, the S-wave propagates within the cookware, causing surface vibrations and generating Rayleigh surface waves. The L-waves and Rayleigh surface waves combine to form a composite wave, predominantly longitudinal, propagating in the air. This composite signal is received by a sensor in the acoustic wave receiving module. The effective detectable quantity in the composite wave is predominantly longitudinal, but it still contains some characteristic information of the surface waves converted from transverse waves.

[0071] Since cookware of different materials has different material properties, wave velocity can usually reflect these properties. However, in practical engineering applications, although the wave velocity of a single wave can reflect material properties to some extent, it is easily affected by temperature and installation. Therefore, in this embodiment, the wave velocities corresponding to transverse and longitudinal waves are calculated separately. Based on the ratio of these two wave velocities, the objectively existing temperature factor can be eliminated, and the wave velocity ratio has a compensatory effect on path error.

[0072] Furthermore, the transverse and longitudinal wave velocities generated by lasers of different wavelengths striking the cookware to be identified are obtained, including: obtaining the longitudinal wave parameters of the longitudinal wave excited by the laser penetrating the cookware to be identified, and calculating the longitudinal wave velocity corresponding to the longitudinal wave based on the longitudinal wave parameters; obtaining the surface wave parameters of the surface wave excited by the laser propagating inside the cookware to be identified, and calculating the transverse wave velocity corresponding to the surface wave based on the surface wave parameters and the preset ratio between the surface wave and the transverse wave.

[0073] Since longitudinal waves travel faster than transverse waves in solids such as cookware, longitudinal waves are usually received first; while transverse waves need to be extracted from the Rayleigh surface waves they carry. Figure 4 This is a schematic diagram of sound wave reception provided in an embodiment of this application, for reference. Figure 4 As can be seen, the actual received sound waves mainly consist of two stages. The first stage is the sound wave that travels directly through the air and returns a distance L after the laser excites the pot wall; this is the sound wave corresponding to the first peak of the received signal in the diagram. The second stage is the sound wave that first travels a distance s through the pot wall and then returns a distance L through the air; this is the sound wave corresponding to the second peak of the received signal in the diagram. Other stages that propagate back after multiple reflections are too weak and unnecessary for calculation. Taking the first received longitudinal wave as an example, the time difference between the two echoes... The longitudinal wave velocity is calculated based on the distance s corresponding to the propagation distance from the pot wall. The calculation formula can be expressed as:

[0074] ;

[0075] Where s represents the propagation distance along the pot wall, Indicates the time difference between two sound wave receptions, corresponding to Figure 4 △t in the equation.

[0076] Figure 5 This is a flowchart illustrating the determination of longitudinal wave velocity provided in an embodiment of this application. (Reference) Figure 5 To determine the longitudinal wave velocity, a laser source is first alternately emitted onto the surface of the cookware to be identified, thus generating longitudinal waves, or P-waves. A sensor is then mounted normally to acquire the longitudinal wave parameters, and the velocity is calculated using the formula for longitudinal wave velocity. .

[0077] Since longitudinal waves are waves in which the vibration direction of particles in a medium is parallel to the wave propagation direction, calculating the longitudinal wave velocity requires considering the density of the propagating medium and the Lamé coefficient, which is related to the elastic properties of the medium. , The calculated P-wave velocity was obtained. The specific formula is:

[0078] ;

[0079] in, , Lamé coefficient, which is related to the elastic properties of the medium. This indicates the density of the medium through which the transmission occurs, such as the density of air.

[0080] Figure 6 This is a flowchart for determining the shear wave velocity provided in an embodiment of this application. (Reference) Figure 6 When calculating the transverse wave velocity, since the received raw acoustic signal contains certain surface Rayleigh wave information, which can be extracted through modal analysis, a short-time Fourier transform can be performed on the received raw acoustic signal to obtain the time-spectrum. Subsequently, surface wave parameters of the surface Rayleigh wave are extracted through modal analysis, and based on these parameters, modal analysis is performed to determine the wave velocity of the surface Rayleigh wave. Subsequently, the wave velocity based on surface Rayleigh waves... With transverse wave velocity The relationship between them: The transverse wave velocity was calculated. And output it.

[0081] A transverse wave is a wave in which the vibration direction of particles in a medium is perpendicular to the direction of wave propagation. Calculating the transverse wave velocity requires considering the density of the propagating medium and the Lamé coefficient, which is related to the elastic properties of the medium. The transverse wave velocity was calculated. The specific formula is:

[0082] ;

[0083] in, Lamé coefficient, which is related to the elastic properties of the medium. The density of the propagation medium is represented, such as the density of air. The propagation speed of longitudinal waves reflects the elastic modulus of the material; some of them penetrate the cookware and enter the air, while others are reflected. Transverse waves characterize the shear modulus; they propagate only within the solid and transform into Rayleigh surface waves upon reaching the surface.

[0084] Step S220: Determine the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient based on the ratio of the transverse wave velocity to the longitudinal wave velocity.

[0085] In practical applications, if the material of a cookware is determined based on the wave velocity corresponding to a single wave, this single wave velocity may be affected by temperature or path errors, leading to inaccuracies in the determination of the cookware material. Taking the temperature sensitivity of a single wave velocity as an example, its coefficient of linear expansion... It is affected by temperature fluctuations, which can be expressed by the formula:

[0086] ;

[0087] ;

[0088] in, This represents the change in the longitudinal wave velocity. Indicates the longitudinal wave velocity; Indicates the current temperature change. This represents the coefficient of linear expansion of the cookware at the current temperature; This represents the change in transverse wave velocity. This indicates the transverse wave velocity.

[0089] For example, most metal materials used in cookware have a coefficient of linear expansion. In the current temperature change At 200℃, the temperature sensitivity error reached 5.6%, resulting in low accuracy in determining the material of the cookware.

[0090] Therefore, in order to avoid the aforementioned errors caused by temperature or transmission path, this embodiment uses wave speed ratio to determine the material of the cookware, so as to eliminate the influence of temperature and path errors.

[0091] Furthermore, the method for determining the longitudinal wave attenuation coefficient based on the ratio of transverse wave velocity to longitudinal wave velocity includes: bandpass filtering the longitudinal wave waveform signal excited by the laser penetrating the cookware to be identified; analyzing the bandpass-filtered longitudinal wave waveform signal according to a preset transformation method to obtain the longitudinal wave envelope signal; and fitting the longitudinal wave envelope signal based on a preset fitting strategy and the ratio of transverse wave velocity to longitudinal wave velocity to obtain the longitudinal wave attenuation coefficient.

[0092] Furthermore, determining the shear wave attenuation coefficient based on the ratio of shear wave velocity to longitudinal wave velocity also includes: bandpass filtering the surface wave waveform signal excited by the laser propagating inside the cookware to be identified; analyzing the bandpass-filtered surface wave waveform signal according to a preset transformation method to obtain the surface wave envelope signal; and fitting the surface wave envelope signal based on a preset fitting strategy and the ratio of shear wave velocity to longitudinal wave velocity to obtain the shear wave attenuation coefficient.

[0093] Using only wave velocity may not be sufficient to distinguish materials that are partially similar, such as those with similar densities but different internal structures. The attenuation coefficient reflects the material's internal friction or microstructure, providing an additional dimension for differentiation. For example, stainless steel and copper may have similar wave velocities, but their attenuation coefficients differ significantly, allowing for more accurate material identification.

[0094] Figure 7 This is a flowchart of the attenuation coefficient acquisition method provided in the embodiments of this application, see reference. Figure 7In determining the attenuation coefficient, the original acoustic signal is first bandpass filtered. Then, the envelope signal is extracted based on the Hilbert transform. Finally, the envelope signal is fitted using an exponential fitting relationship to obtain the corresponding attenuation coefficient. .

[0095] The method for determining the exponential fitting relationship includes: after receiving the original sound wave signal, determining the signal amplitude A(t), and then using exponential fitting to determine the relationship between the waveform (generally with attenuation following an exponential relationship) and the initial signal A0.

[0096] ;

[0097] Where A0 represents the initial amplitude. This represents the corresponding wave velocity. t represents the propagation time. This represents the attenuation coefficient. Based on the above formula, the attenuation coefficients for different waveforms can be obtained by fitting using methods such as least squares. .

[0098] Step S230: Based on the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient, identify the material of the cookware to be identified from the preset material parameter library.

[0099] Since different cookware materials correspond to different material characteristic parameters, after determining the longitudinal wave velocity, transverse wave velocity, wave velocity ratio, and corresponding attenuation coefficient using the methods described above, the corresponding cookware material can be determined from the material characteristic parameter standard library, i.e., the preset material parameter library. The material characteristic parameter standard library includes Tables 1 and 2 below, where Table 1 is the performance table for metallic materials and Table 2 is the performance table for non-metallic materials.

[0100] Table 1 Properties of Metallic Materials

[0101]

[0102] Table 2 Properties of Non-metallic Materials

[0103]

[0104] By employing the above steps, lasers of different wavelengths are emitted onto the cookware to obtain the transverse and longitudinal waves reflected by the cookware. Based on the ratio of the transverse wave velocity to the longitudinal wave velocity, the attenuation coefficients of the longitudinal and longitudinal waves are calculated, thus matching the appropriate cookware material. This method avoids temperature interference and improves the accuracy of determining the cookware material characteristics by using the ratio of the two beams.

[0105] Furthermore, when testing the material of cookware, the first step can be to detect the presence of the cookware itself. Figure 8 This is a flowchart of the cookware detection and control process provided in an embodiment of this application. (Reference) Figure 8The piezoelectric ceramic acoustic wave receiver sensor can be arranged in a ring around the laser transceiver module, with some parts at different angles, which can improve signal sensitivity. However, it mainly receives longitudinal waves (because transverse waves cannot propagate directly through the air), but it also includes some surface wave (S-wave converted) characteristic information. An oil cup or lower back panel is installed at the bottom of the range hood. Below the oil cup or lower back panel, a laser transceiver module (which can emit dual-wavelength pulsed interleaved modulated laser and also receive a small amount of modulated light reflected from the pot wall) and a PZT piezoelectric ceramic acoustic wave receiver module (arranged in a ring, a distance r from the central laser module, and partially installed at an angle to improve sensitivity) are installed in two units, left and right, to detect the pots on the left and right burners respectively.

[0106] After emitting the laser beam for pot positioning / ranging, the returned laser beam is received, and the round-trip time of the laser beam is extracted. Subsequently, the straight-line distance between the laser transceiver module and the pot wall was calculated using the TOF method based on the laser round-trip time.

[0107] Therefore, in the initial stage of startup, laser ranging is used to obtain the straight-line distance d between the cookware wall and the cookware wall (which will be used later to subtract the path and time of sound propagation in the air):

[0108] ;

[0109] Where c represents the speed of light (3 × 10⁻⁶) 8 m / s This indicates the round-trip time of the laser.

[0110] The presence of a pot on the burner can be determined by whether the distance d is less than the threshold da. If d < da, then there is a pot on the burner. If the distance is too large, i.e., d ≥ da (e.g., more than 500 mm), then there is no pot.

[0111] After determining that a pot is present on the stove, the distance L that the sound wave travels in the air is calculated using the straight-line distance d between the piezoelectric ceramic acoustic wave receiving sensor and the pot wall, and the distance r between the piezoelectric ceramic acoustic wave receiving module and the laser transceiver module.

[0112] ;

[0113] This embodiment also provides a method for linking a range hood and stove based on cookware material. The process includes the following steps: obtaining the material of the cookware to be identified based on the above-mentioned cookware material identification method; matching the material of the cookware to be identified in a preset material library to obtain the target material; determining the cooking scenario of the cookware to be identified based on the target material; and determining the angle of the baffle plate in the range hood, the fan speed of the range hood, and the firepower status of the stove based on the cooking scenario.

[0114] In some of these embodiments, based on a cooking scenario, the angle of the baffle plate in the range hood, the fan speed of the range hood, and the firepower status of the stove are determined, including:

[0115] Obtain the number of cookware to be identified; if it is determined that there are at least two cookware to be identified, determine the priority of the cookware to be identified based on the cooking scenario of the cookware to be identified; based on the priority, determine the first guide plate angle corresponding to at least two cookware to be identified.

[0116] In some embodiments, the method further includes: if it is determined that the number of cookware to be identified is a single one, determining that the location of the cookware to be identified is the cooking side; and determining the angle of the second guide plate corresponding to the cooking side.

[0117] In some embodiments, the material of the cookware to be identified is matched in a preset material library to obtain the target material, including: if the material of the cookware to be identified cannot match any material in the preset material library, a material mismatch signal is output.

[0118] Table 3 shows the preset classification logic for cookware materials in different scenarios. Referring to Table 3, after determining the material of the cookware to be identified, the stove firepower and the preset mode of the range hood are adjusted accordingly based on the cooking scenarios corresponding to different materials.

[0119] Table 3. Preset Classification Logic of Cookware Materials and Corresponding Scenarios

[0120]

[0121] This embodiment provides a cookware material-based range hood and cooktop linkage device. The device includes: a cookware material identification component, a controller, a range hood, and a cooktop. The controller is connected to the range hood, cooktop, and cookware material identification component. The cookware material identification component includes a laser transceiver module and a piezoelectric acoustic wave receiver module. The laser transceiver module is used to emit lasers of different wavelengths to the cookware to be identified. The piezoelectric acoustic wave receiver module is used to receive the longitudinal waves generated by the laser penetrating the cookware to be identified, as well as the surface waves generated by the laser propagating within the cookware. The controller is used to execute the above-mentioned cookware material identification method and the cookware material-based range hood and cooktop linkage method.

[0122] This embodiment also provides a method for linking a range hood and a cooktop, used in a range hood and cooktop linkage system. The system includes a range hood, a cooktop, a cookware, a laser transceiver module, a piezoelectric acoustic wave receiving module, and a controller. The method includes: the laser transceiver module emitting lasers of different wavelengths to the cookware; the piezoelectric acoustic wave receiving module receiving longitudinal waves and surface waves formed by the lasers of different wavelengths hitting the cookware; the controller determining the cookware material based on the longitudinal waves and surface waves; and generating a range hood control signal and a cooktop control signal based on the cookware material; the range hood, responding to the range hood control signal, operating according to the guide vane angle and fan speed carried in the range hood control signal; and the cooktop, responding to the cooktop control signal, operating according to the cooktop firepower status carried in the cooktop control signal.

[0123] Furthermore, this embodiment also provides a smart appliance that employs the cookware material identification method as described in the first aspect, and executes the range hood and gas stove linkage method based on cookware material as described in the second aspect; the smart appliance is either a range hood or a gas stove.

[0124] The following describes and illustrates this embodiment through specific examples.

[0125] Figure 9 This is a schematic diagram of the range hood and gas stove provided in this specific embodiment. (Reference) Figure 9 An oil cup or rear panel is installed at the bottom of the range hood. A laser transceiver module (which can emit dual-wavelength pulse interleaved modulation laser and receive a small amount of modulated light reflected from the pot wall) and a PZT array, i.e., a piezoelectric ceramic acoustic wave receiver module, are installed below the oil cup or rear panel. They can be installed in two units, left and right, to detect the pots on the left and right burners respectively.

[0126] Cooking utensils are placed on the gas stove. When the user cooks with these utensils, the fumes are absorbed by the range hood. A stain-proof window and microphone guard are installed on the oil cup or rear panel to prevent oil from accumulating on the laser transceiver module and PZT array.

[0127] The distance between the laser transceiver module and the cooking utensil (pot wall) is d, the distance between the PZT array and the pot wall is s, and the distance between the laser transceiver module and the PZT array is r.

[0128] Figure 10 This is a schematic diagram showing the positions of the laser transceiver module and the PZT array provided in this specific embodiment. (Refer to...) Figure 10 The laser transceiver module is positioned at the center. The PZT array is arranged in a ring around the central laser transceiver module, with a distance r between them. Some modules are installed at an angle such as 30° to improve sensitivity.

[0129] Figure 11This is a schematic diagram of the range hood and gas stove provided in this specific embodiment. (Reference) Figure 11 The system includes an optical module, an acoustic module, a control module, and an execution module. The optical module contains a dual-wavelength laser, a polarization modulator, a dynamic focusing module, and a light receiving device. The dual-wavelength laser, polarization modulator, and dynamic focusing module focus the light beam and emit it onto the surface of the cookware being tested. The optical module then receives the light waves reflected from the surface of the cookware.

[0130] The acoustic module includes a ring-shaped piezoelectric PZT array, which detects the corresponding sound waves.

[0131] The control module includes a sensor controller and a preset material database. By receiving sound waves, it calculates the corresponding transverse wave velocity, longitudinal wave velocity, wave velocity ratio, and corresponding attenuation coefficient, and determines the corresponding cookware material in the preset material database.

[0132] The execution module includes a range hood controller, a cooktop controller, and corresponding speed actuators for both controllers. The range hood controller and cooktop controller communicate wirelessly. Based on the determined cookware material, the range hood and cooktop are controlled according to the corresponding cooking scenario.

[0133] Figure 12 This is a flowchart of the cookware material identification and linkage control method provided in this specific embodiment, for reference. Figure 12 The linkage process includes: starting with the power-on self-test to ensure that all systems contained in the smart appliance are in normal working order, and initializing the left and right laser sensors.

[0134] Subsequently, a pot inspection operation is performed to determine whether a pot is currently on the burner. If there is no pot on the burner, the process ends directly; if there is a pot on the burner, alternating dual-wavelength laser emission is performed, and the wave velocity ratio sub-process is executed to obtain the wave velocity ratio. The specific method for obtaining the wave velocity ratio is described in the above embodiment and will not be repeated here. After obtaining the wave velocity ratio, the absorption coefficient sub-process is executed to obtain the transverse wave attenuation coefficient. and longitudinal wave attenuation coefficient And execute the material decision subprocess.

[0135] The material decision sub-process includes: querying the material library based on features such as attenuation coefficient. If a material can be matched in the material library, the corresponding material information is output; if no material can be matched after traversing all materials in the data, the result of unmatched material is output, and it is suggested to enter safe mode; if not all materials in the data are traversed, the next set of materials is matched until a match is found or the result of unmatched material is output.

[0136] After determining the material of the cookware, metal materials are labeled for stir-frying, and non-metal materials are labeled for stewing, simmering, and making soup, so that appropriate cooking strategies can be adopted according to different materials.

[0137] Next, it determines whether there are pots on both sides of the stove: if there are pots on both sides, it enters the priority determination stage of left and right pot mode; if there is only a pot on one side, it enters the single-side cooking mode, at which time the angle of the deflector on the cooking side and the non-cooking side is set to 80:20.

[0138] In the priority determination of the left and right pot modes, if it is a left-right double stir-fry mode, the angle of the deflectors on the two cooking sides is set to 50:50; if it is not a double stir-fry mode, it further determines whether it is left stir-fry and right stew or right stir-fry and left stew. If it is left stir-fry and right stew, the angle of the deflectors on the two cooking sides is set to 70:30; if it is right stir-fry and left stew, the angle of the deflectors on the two cooking sides is set to 30:70; if it does not meet any of the above cooking modes, it enters the intelligent dynamic allocation mode of deflector angle, and the user can automatically adjust the deflector angle according to the actual cooking needs.

[0139] Finally, the total air volume requirement is calculated based on different deflector angles, the fan speed is controlled, and the stove firepower is set synchronously to complete the entire smart appliance range hood and stove linkage control process, thereby improving the user's intelligent cooking experience.

[0140] The smart appliances provided in this specific embodiment, including the range hood and cooktop linkage device, do not require built-in chips. They can automatically identify multiple sets of cookware material detection devices and can automatically set preset working conditions in conjunction with the cooktop and range hood, facilitating intelligent cooking. This allows the range hood and cooktop to automatically start to the optimal mode according to the cookware material, providing a better cooking experience and improving scene adaptability and user cooking experience.

[0141] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0142] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

[0143] The term "embodiment" in this application refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily imply the same embodiment, nor does it imply that it is mutually exclusive with or independent of other embodiments. It will be clearly or implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0144] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A method for identifying the material of cookware, characterized in that, The method includes: The transverse and longitudinal wave velocities generated when lasers of different wavelengths strike a cookware to be identified are obtained. The longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient are determined based on the ratio of the transverse wave velocity to the longitudinal wave velocity. Based on the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient, the material of the cookware to be identified is determined from a preset material parameter library.

2. The cookware material identification method according to claim 1, characterized in that, The acquisition of transverse and longitudinal wave velocities generated by lasers of different wavelengths striking the cookware to be identified includes: Obtain the longitudinal wave parameters of the longitudinal wave excited by the laser penetrating the cookware to be identified, and calculate the longitudinal wave velocity corresponding to the longitudinal wave based on the longitudinal wave parameters; The surface wave parameters of the surface wave excited by the laser propagating in the cookware to be identified are obtained. Based on the surface wave parameters and the preset ratio of surface wave to transverse wave, the transverse wave velocity corresponding to the surface wave is calculated.

3. The cookware material identification method according to claim 1, characterized in that, The step of determining the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient based on the ratio of the transverse wave velocity to the longitudinal wave velocity includes: The longitudinal wave waveform signal generated by the laser penetrating the cookware to be identified is subjected to bandpass filtering; According to the preset transformation method, the longitudinal wave waveform signal after bandpass filtering is analyzed to obtain the longitudinal wave envelope signal; Based on a preset fitting strategy, the longitudinal wave envelope signal is fitted by combining the ratio of the transverse wave velocity to the longitudinal wave velocity to obtain the longitudinal wave attenuation coefficient.

4. The cookware material identification method according to any one of claims 1 or 3, characterized in that, The step of determining the longitudinal wave attenuation coefficient and the transverse wave attenuation coefficient based on the ratio of the transverse wave velocity to the longitudinal wave velocity further includes: The surface wave waveform signal excited by the laser propagating inside the cookware to be identified is subjected to bandpass filtering; According to the preset transformation method, the surface wave waveform signal after bandpass filtering is analyzed to obtain the surface wave envelope signal; Based on a preset fitting strategy, the surface wave envelope signal is fitted by combining the ratio of the shear wave velocity to the longitudinal wave velocity to obtain the shear wave attenuation coefficient.

5. A method for linking cooktop and range hood based on cookware material, characterized in that, The method includes: Obtain the material of the cookware to be identified based on the cookware material identification method according to any one of claims 1 to 4; In a preset material library, the material of the cookware to be identified is matched to obtain the target material; Based on the target material, determine the cooking scenario of the cookware to be identified; Based on the cooking scenario, the angle of the baffle plate in the range hood, the fan speed of the range hood, and the firepower status of the stove are determined.

6. The method for linking cooktop and range hood based on cookware material according to claim 5, characterized in that, The determination of the angle of the baffle plate in the range hood, the fan speed of the range hood, and the firepower status of the stove based on the cooking scenario includes: Obtain the quantity of the cookware to be identified; If it is determined that there are at least two cookwares to be identified, the priority of the cookwares to be identified is determined according to the cooking scenario of the cookwares to be identified; Based on the priority, at least two cookwares to be identified are determined, and the corresponding first guide plate angles are determined.

7. The method for linking cooktop and range hood based on cookware material according to claim 6, characterized in that, The method further includes: If it is determined that the number of cookware to be identified is a single piece, the location of the cookware to be identified is determined to be the cooking side; Determine the angle of the second deflector corresponding to the cooking side.

8. A range hood and stove linkage device based on cookware material, characterized in that, The device includes: a cookware material recognition component, a controller, a range hood, and a cooktop; the controller is connected to the range hood, the cooktop, and the cookware material recognition component. The cookware material identification component includes a laser transceiver module and a piezoelectric acoustic wave receiving module; the laser transceiver module is used to emit lasers of different wavelengths to the cookware to be identified; the piezoelectric acoustic wave receiving module is used to receive the longitudinal waves excited by the laser penetrating the cookware to be identified, as well as the surface waves caused by the laser propagating inside the cookware to be identified. The controller is used to perform the cookware material identification method as described in any one of claims 1 to 4, and to perform the cookware material-based range hood and stove linkage method as described in any one of claims 5 to 7.

9. A method for linking a range hood and a stove, characterized in that, For use in a range hood and cooktop linkage system, the system includes a range hood, a cooktop, cookware, a laser transceiver module, a piezoelectric acoustic wave receiver module, and a controller; The method includes: The laser transceiver module emits lasers of different wavelengths into the cookware; The piezoelectric acoustic wave receiving module receives longitudinal waves and surface waves formed by lasers of different wavelengths striking the cookware; The controller determines the cookware material based on the longitudinal wave and the surface wave; and generates range hood control signals and stove control signals based on the cookware material. The range hood operates in response to the range hood control signal, according to the guide vane angle and fan speed carried in the range hood control signal; The stove operates in response to the stove control signal and according to the stove firepower status carried in the stove control signal.

10. A smart appliance, characterized in that, The cookware material identification method as described in any one of claims 1 to 4 is adopted, and the range hood and stove linkage method based on cookware material as described in any one of claims 5 to 7 is executed; the smart appliance is one of a range hood and a gas stove.

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