Standard load pot for electromagnetic compatibility test of induction cooker and whole-process quality control system

Abstract

The application discloses a standard load pot for electromagnetic compatibility test of an induction cooker, and relates to the technical field of electromagnetic compatibility test. The application comprises a reflected thermal image acquisition module, a delay segment identification module, a thermal balance tracking module, a rhythm strategy generation module and an energy intervention execution module. The reflected thermal image acquisition module synchronously records the reflection characteristics of the enamel surface of each pot and the temperature rise process in the first three minutes of the initial heating stage by using a unified light source in cooperation with a thermal imaging acquisition device, and generates a corresponding table of reflection data and temperature rise data. The application establishes a whole-process quality control mechanism of reflection acquisition, delay identification, thermal balance tracking, rhythm generation and energy intervention, and realizes quantitative coordination and consistent control of the thermal response of the pot. By introducing a reflection shielding window, a phase reverse pulse and a virtual heat absorption period, the heating energy distribution is balanced, the electromagnetic harmonic stability is maintained, and the test repeatability and load consistency are improved.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic compatibility testing technology, specifically to a full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware. Background Technology

[0002] The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware refers to establishing a traceable, quantifiable, and closed-loop quality control and consistency assurance system covering the entire lifecycle of cookware, from design, manufacturing, testing, functional testing to verification. Its core lies in using standards such as GB4343.1-2018 and CISPR14-1 as baselines, and forming a group of physically consistent samples by standardizing key parameters such as cookware material (MTC1 enamel steel), thickness, enamel layer uniformity, and bottom concavity. During the manufacturing stage, dimensional tolerances and enamel adhesion strength are graded and tested. During the functional testing and acceptance stages, each batch of samples undergoes dual verification using geometric measurements and electromagnetic compatibility uniformity testing (covering the 0.16–30MHz frequency band) to ensure that the electromagnetic response deviation between samples is controlled within 1dBμV. Furthermore, a periodic re-inspection and lifespan monitoring mechanism is introduced during the subsequent use of the finished product to dynamically track enamel layer aging and deformation changes, thereby achieving full-process assurance of the consistency, stability, and reusability of the standard load cookware performance. This system essentially integrates materials engineering, testing and metrology, functional testing and electromagnetic compatibility test management to build a quality control framework that supports standardized, reproducible and traceable EMC testing of induction cookware.

[0003] The existing technology has the following shortcomings: In the existing technology, slight differences in sintering temperature, pigment ratio, and surface finish between different batches of enamel layers can lead to deviations in the reflectivity of the enamel layer. When the reflectivity of the enamel layer is different, the absorption and dissipation rates of heat radiation during induction heating of the cookware will change, easily causing inconsistencies in the thermal equilibrium rate of the cookware. Within the same test cycle, this difference will cause a shift in the rate of rise and the stable range of the cookware's temperature rise curve, thereby causing dynamic changes in permeability and resistivity, resulting in an imbalance in the distribution of electromagnetic field energy. Furthermore, the harmonic amplitude in the electromagnetic emission signal will fluctuate with temperature changes, easily leading to deviations in electromagnetic compatibility test results and affecting the consistency and repeatability of the test.

[0004] The information disclosed in the background section is only intended to enhance the understanding of the background of this disclosure, and therefore may include information that does not constitute prior art known to those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware, in order to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware, comprising a reflected thermal imaging acquisition module, a delay segment recognition module, a thermal balance tracking module, a rhythm strategy generation module, and an energy intervention execution module:

[0007] The thermal reflection acquisition module uses a unified light source in conjunction with thermal imaging acquisition equipment to synchronously record the reflective characteristics of the enamel surface of each cookware and the temperature rise process during the first three minutes of the initial heating stage, generating a table corresponding to the reflective data and temperature rise data, which serves as input data for subsequent analysis.

[0008] The delayed segment identification module compares the reflection data and temperature rise data point by point in a correspondence table to identify the temperature rise delay time period caused by the difference in the reflectivity of the enamel layer, extracts the temperature rise delay segment information, forms a temperature rise delay segment list, and uses this list as input for subsequent thermal equilibrium rate analysis.

[0009] The thermal balance tracking module traces back the corresponding heating power curve and heat dissipation process curve based on the list of temperature rise delay segments, locates the thermal balance rate change segment, generates a list of temperature change trajectories, and provides input data for the formulation of heating control strategies.

[0010] The rhythm strategy generation module rearranges the heating time and pause intervals based on the temperature change trajectory list, determines the heating sequence and power triggering conditions, generates a thermomagnetic coordinated control scheme, and provides execution instructions for consistent thermal response adjustment.

[0011] The energy intervention execution module performs rhythmic heating adjustment according to the thermomagnetic coordination control scheme. It inserts a short-time window of reflection shielding and a phase-opposite pulse in the thermal equilibrium rate offset interval, and simultaneously projects a virtual heat absorption period. Through rhythmic energy intervention, it keeps the thermal response of different cookware consistent during the induction heating process, thereby maintaining the stability of electromagnetic harmonic distribution.

[0012] Preferably, the steps for generating the correspondence table between reflection data and temperature rise data are as follows:

[0013] Using a unified light source in conjunction with thermal imaging acquisition equipment, the enamel surface of each cookware is illuminated. The incident angle of the light source is kept constant relative to the normal of the enamel surface, the spectral distribution covers the enamel reflection response range, and the luminous flux, illuminance and incident uniformity are adjusted by a photometer to create a uniform lighting environment on the irradiated surface.

[0014] Place the cookware on a non-magnetic support platform, turn on the light source to illuminate it, record the initial state of the light distribution, and complete the optical acquisition reference setting;

[0015] Initialize the thermal imaging acquisition device, align the detection field of view with the area illuminated by the light source, synchronize the frame rate, integration time and response bandwidth with the light source, acquire environmental reference frames and record the initial temperature distribution;

[0016] During the initial heating stage, light source illumination and thermal image acquisition are started simultaneously. The illumination and ambient temperature are kept stable. The reflection data is converted into a reflectivity matrix, and the temperature rise data is converted into a temperature matrix and pixel registration is performed to form a correspondence table between the reflection data and the temperature rise data as input for subsequent analysis.

[0017] Preferably, the synchronization process of light source illumination and thermal image acquisition is further defined as locking the time signal through unified timing control logic, so that the light source control signal and the thermal imaging acquisition signal are consistent, ensuring that the reflection data and temperature rise data are synchronously corresponding in time and space, thereby forming a complete pairing relationship between the reflectivity matrix and the temperature matrix, which is used to accurately establish the mapping data between the reflection characteristics of the enamel surface and the temperature rise process.

[0018] Preferably, the steps for forming the temperature rise delay segment list are as follows:

[0019] The table of correspondence between reflection data and temperature rise data is segmented according to time series, and the reflectivity curve and temperature curve are synchronously divided at a uniform time interval, so that the reflection data points and temperature data points maintain a one-to-one correspondence in time and space.

[0020] By comparing the reflectance curve and the temperature rise curve point by point with time as the benchmark, the energy absorption delay phenomenon is identified in the time interval when the reflectance decreases but the temperature does not rise synchronously. The reflectance difference and the temperature change rate are recorded to determine the temperature rise delay time period.

[0021] The identified temperature rise delay time periods are aggregated into intervals, and intervals with adjacent times and continuous delay trends are merged to generate temperature rise delay segments that include start and end times, duration, reflectivity change, and temperature rise rate change.

[0022] The aggregated temperature rise delay segments are organized according to time sequence and spatial location to form a list of temperature rise delay segments, and this list is used as input data for thermal equilibrium rate analysis.

[0023] Preferably, each temperature rise delay segment in the temperature rise delay segment list includes the change in reflectance, the change in temperature rise rate, the spatial coordinate position, and the time series index. After the delay segment list is generated, it is indexed and associated with the reflection data and the temperature rise data to ensure that the data source of the temperature rise delay segment can be accurately traced back based on the time and space correspondence during thermal equilibrium rate analysis.

[0024] Preferably, the steps for generating the temperature change trajectory list are as follows:

[0025] Based on the timestamps and spatial coordinates in the list of temperature rise delay segments, the heating power output curve and the heat dissipation process curve are extracted from the heating process record file. After being resampled with the same time step, they are aligned with the list of temperature rise delay segments on the time axis to form power output data, heat dissipation response data and temperature rise delay data.

[0026] Match each delay interval in the list of temperature rise delay segments with the heating power curve and the heat dissipation curve, extract the data of the corresponding time period and establish a spatial mapping relationship so that the power curve and the heat dissipation curve correspond one-to-one with the delay segment;

[0027] Based on the mapped power curve, heat dissipation curve, and delay segment data, analyze the dynamic differences between changes in energy input and energy release, locate the thermal equilibrium rate change segment, and maintain consistency in time sequence.

[0028] The identified thermal equilibrium rate change segments are organized in chronological order and spatial coordinates to form a temperature change trajectory list, which is used as input for formulating heating control strategies.

[0029] Preferably, when locating the thermal equilibrium rate change segment, the difference between the energy input change and the energy release change is calculated by reading the rising and falling trends of the heating power curve and simultaneously reading the change rate of the heat dissipation curve. When there is a continuous deviation between the energy input change rate and the energy release change rate, the thermal equilibrium rate change segment is determined, and adjacent change segments are continuously marked according to the time sequence to form a complete thermal equilibrium evolution trajectory.

[0030] The preferred steps for generating the thermomagnetic coordinated control scheme are as follows:

[0031] Based on the temperature change trajectory list, the heat equilibrium rate change segment is analyzed, and the start time, end time, duration and heat equilibrium rate change value are read to determine the dynamic law of temperature rise and fall, and form a time series relationship group of temperature change and power response.

[0032] Based on the thermal response segments in the temperature change trajectory, the heating time and pause interval are rearranged. By shortening or extending the heating time and adjusting the pause interval, a heating rhythm planning table is formed so that the power curve remains continuous in local time periods.

[0033] Using the heating rhythm planning table as input, the power increase, decrease and hold trigger conditions are set according to the changes in heat balance, and the heating sequence is planned according to the order of heat balance changes to form a heating sequence unit;

[0034] By integrating heating time, pause interval, power triggering conditions, and heating sequence, a thermomagnetic coordinated control scheme is generated, and an execution command sequence containing power level and magnetic field phase parameters is output.

[0035] Preferably, when generating the thermomagnetic coordinated control scheme, the power output level and the magnetic field phase state are defined synchronously in time sequence. Each time period includes heating trigger conditions and pause interval parameters. The execution command sequence is output sequentially with time as the main line, so that the power change and temperature response are coordinated during the induction heating process, thereby ensuring the continuous and stable thermal response of each heating section.

[0036] Preferably, the rhythmic heating adjustment is performed according to the thermomagnetic coordinated control scheme. A short-time window of reflection shielding and a phase-reversed pulse are inserted into the thermal equilibrium rate offset interval, and a virtual heat absorption period is projected. The steps to achieve consistent thermal response for different cookware through rhythmic energy intervention are as follows:

[0037] Based on the power triggering conditions and heating sequence in the thermomagnetic coordinated control scheme, the thermal equilibrium rate offset segment in the temperature change trajectory list is read, the degree of offset between power output and thermal response curve is analyzed, the start time, end time and duration of the offset interval are determined, and the heating time and pause interval are mapped to the offset interval.

[0038] A short-time window for reflection shielding is inserted within the offset interval. By adjusting the incident conditions of the light source, the energy feedback reflected by the enamel layer is reduced, local heat absorption is suppressed, and the heat distribution is balanced, so that the energy input process remains continuous.

[0039] In the middle and later part of the offset interval, a phase reversal pulse is triggered to change the magnetic flux distribution path by adjusting the excitation phase direction of the induction coil, thereby dispersing local heat accumulation and maintaining a stable overall heating rhythm.

[0040] After the phase-reverse pulse action ends, a virtual heat absorption period is introduced. By setting an energy absorption simulation interval, the energy diffusion process is extended, so that the thermal response of the cookware surface tends to be consistent and the electromagnetic harmonic distribution is kept stable.

[0041] The technical effects and advantages provided by the present invention in the above technical solution are as follows:

[0042] This invention constructs a complete quality control process consisting of reflective thermal imaging acquisition, delayed segment identification, thermal balance tracking, rhythm strategy generation, and energy intervention execution, enabling cookware to form a quantifiable and traceable thermal response control mechanism during induction heating. This scheme can accurately capture temperature rise deviations caused by differences in enamel layer reflectivity in the early stages of heating, and achieve dynamic coordination of the thermal responses of different cookware through rhythmic energy intervention, ensuring consistency in temperature change trajectories across test samples. This effectively eliminates thermal response deviations caused by batch differences in cookware, improving the repeatability and reliability of electromagnetic compatibility testing.

[0043] This invention achieves a balanced distribution of heating energy in time and space by introducing a short-time reflection shielding window, a phase-reversing pulse, and a virtual heat absorption period during the thermomagnetic coordinated control process. This process establishes a closed-loop feedback relationship between heating power output, magnetic field phase, and temperature response, preventing localized temperature drift caused by energy concentration and maintaining a stable electromagnetic field harmonic distribution. Through continuous thermal balance regulation, the stability of the cookware's electromagnetic response can be guaranteed over long-term testing periods, providing technical support for the consistency and reproducibility of standard loads. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0045] Figure 1 This is a schematic diagram of the module of the standard load cooker full-process quality control system for electromagnetic compatibility testing of induction cookers according to the present invention. Detailed Implementation

[0046] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the examples set forth herein; rather, they are provided so that the description of this disclosure will be more complete and fully convey the concept of the exemplary embodiments to those skilled in the art.

[0047] This invention provides, for example Figure 1 The standard load cooker quality control system for electromagnetic compatibility testing of induction cookware shown includes a reflected thermal imaging acquisition module, a delay segment recognition module, a thermal balance tracking module, a rhythm strategy generation module, and an energy intervention execution module.

[0048] The thermal reflection acquisition module uses a unified light source in conjunction with thermal imaging acquisition equipment to synchronously record the reflective characteristics of the enamel surface of each cookware and the temperature rise process during the first three minutes of the initial heating stage, generating a table corresponding to the reflective data and temperature rise data, which serves as input data for subsequent analysis.

[0049] To ensure that the reflective properties of the enamel surface of each cookware are synchronously acquired and the temperature rise during the initial heating stage is correlated with the temperature rise data, a combined optical and thermal acquisition method is used to generate and pair the basic data. The specific implementation steps are as follows:

[0050] During light source setup and illumination control, a set of white light sources with stable spectral distributions were uniformly positioned at the top and sides of the test area, with the incident angle of the light sources remaining constant relative to the normal to the enamel surface of the cookware. The wavelength range of the light sources covered the main spectral range of the enamel surface's reflection response to ensure that the reflection characteristics could fully reflect the energy reflection properties of the enamel layer. The luminous flux, illuminance, and incident uniformity of each light source were adjusted using a standard photometer to create a uniform illumination environment across the entire irradiated surface before the test began. The cookware was placed on a non-magnetic support platform with extremely low thermal conductivity to prevent heat conduction from the bottom from interfering with the temperature rise of the enamel surface. After the light sources were turned on, the incident light and the cookware surface formed a stable reflection area, and the initial state of the illumination distribution was recorded by an optical acquisition unit positioned in the same coordinate system, serving as a reference for subsequent reflection data.

[0051] After the light source is deployed, the thermal imaging acquisition equipment is initialized. The detection field of view of the thermal imaging acquisition equipment is strictly aligned with the area illuminated by the light source to ensure that each reflection point on the enamel surface corresponds to a specific temperature pixel. The frame rate, integration time, and response bandwidth of the thermal imaging acquisition equipment are synchronized with the light source's flicker frequency. The clock signal inside the acquisition equipment is locked to the light source control signal through a main timing controller, ensuring temporal consistency between reflection and temperature information. Before starting acquisition, the thermal imaging acquisition equipment performs a zero-point setting of the ambient thermal background to eliminate interference from ambient radiation on the thermal image signal. A reference frame image is acquired when the cookware is not heated to determine the initial reflection state and reference temperature distribution at various locations on the enamel surface, providing a reference for subsequent temperature rise recording.

[0052] After the thermal imaging acquisition equipment completes its baseline settings, the heating device is activated to enter the initial heating phase, simultaneously initiating the synchronous acquisition process of light source illumination and thermal images. The initial heating phase lasts for three minutes. During this phase, the light source maintains a constant illuminance output, and the thermal imaging acquisition equipment continuously records time-series images of the temperature changes on the enamel surface of the cookware at a set frame rate. Each frame of thermal image data and its corresponding light reflection frame are synchronously marked on the time axis to form a reflection data sequence and a temperature rise data sequence. During the heating process, the light intensity, ambient temperature, and thermal imaging acquisition parameters remain stable to prevent data drift caused by external disturbances. The reflection data is converted into a reflectance numerical matrix through spectral analysis, and the temperature rise data is converted into a temperature field matrix through thermal imaging, and pixel-level registration is performed at the same spatial resolution. Each point in the reflectance matrix has a one-to-one correspondence with a corresponding point in the temperature matrix, thus forming a complete reflection-temperature rise correspondence record on both the time and spatial axes.

[0053] After the reflection data sequence and temperature rise data sequence were acquired, the synchronously acquired data were paired to establish a correspondence table between the reflection data and temperature rise data. This table uses time as the vertical axis and spatial coordinates as the horizontal axis, matching the reflectivity value of the enamel surface with the temperature value at the same location within each time segment. This matching method allows us to obtain the mapping relationship between the reflection characteristics and temperature rise changes of the cookware enamel surface during the initial heating stage. The reflectivity and temperature correspondence data are stored in time-series format, with each data unit containing a reflectivity value, a corresponding temperature value, and a timestamp, used to describe the coupling characteristics between the optical reflection behavior and thermal response of the enamel surface. The structure of the correspondence table covers the differences in reflection and temperature rise rates in various regions of the cookware surface, providing input data for subsequent analysis steps. Throughout the acquisition and pairing process, light source illumination, thermal image acquisition, and data synchronization are maintained consistent by a unified timing control logic, ensuring accurate spatiotemporal registration of the reflection data and temperature rise data, and enabling the resulting correspondence table to fully reflect the correspondence between the optical characteristics and thermal behavior of the enamel layer during the initial heating stage.

[0054] The delayed segment identification module compares the reflection data and temperature rise data point by point in a correspondence table to identify the temperature rise delay time period caused by the difference in the reflectivity of the enamel layer, extracts the temperature rise delay segment information, forms a temperature rise delay segment list, and uses this list as input for subsequent thermal equilibrium rate analysis.

[0055] To compare the differences between the reflectivity change and the temperature rise rate of the enamel layer point by point from the correspondence table of reflectivity data and temperature rise data, thereby identifying the temperature rise delay time period caused by the reflectivity difference, and extracting the corresponding temperature rise delay segment information to form a list of temperature rise delay segments that can be used for subsequent thermal equilibrium rate analysis, the specific implementation steps are as follows:

[0056] In the data segmentation stage of reflection and temperature rise, the correspondence table of reflection and temperature rise data generated in the previous stage is segmented according to time series, with each time segment corresponding to the continuous temperature rise process in the initial heating stage. During data segmentation, the reflection and temperature rise data are synchronously divided at uniform time intervals, ensuring that the reflectivity curve and temperature curve within each segment are perfectly aligned on the time axis. This time alignment method guarantees that each reflection data point corresponds to a temperature data point at the same time point, forming reflection-temperature rise data pairs with the same time coordinates. To ensure spatial consistency, each data pair maintains a correspondence from the same spatial pixel location, thus ensuring a one-to-one correspondence between the reflection and temperature rise data in both space and time. After segmentation and pairing, all segmented data are arranged in chronological order to construct a data matrix structure for point-by-point comparison, providing the basic input for subsequent delayed identification.

[0057] In the point-by-point comparison and delayed response identification stage, the reflectivity curve and temperature rise curve are compared point by point with the same time step, using time as the benchmark. Within each time step, the trends of reflectivity and temperature rise rate are simultaneously read, and the temporal relationship between the energy absorption and temperature response of the enamel layer is analyzed by examining the differences between them. When the reflectivity decreases rapidly in adjacent time steps while the temperature rise curve does not rise synchronously, it indicates that there is an energy absorption delay phenomenon in that region, and this time period constitutes the initial candidate region for the temperature rise delay time period. Continuing to compare subsequent data points along the time series, if the temperature change lags behind the reflectivity change in several consecutive time steps, the interval is determined to be a stable delay interval. During this process, the reflectivity difference and temperature change rate at each time point are recorded so that they can be used in subsequent steps to construct the start and end positions and duration of the delay segment. Through this point-by-point comparison method, all time segments with temperature rise lag can be identified throughout the entire heating stage, thus providing a clear range basis for the extraction of delay segments.

[0058] In the delayed segment data aggregation stage, all temperature rise delay time periods identified in the point-by-point comparison stage are aggregated into intervals. Multiple small intervals that are temporally adjacent and have a continuous delay trend are merged into a single complete temperature rise delay segment to avoid excessive data fragment redundancy caused by excessive dispersion. Each temperature rise delay segment includes a start time, end time, delay duration, change in average reflectivity, and corresponding change in temperature rise rate. To maintain spatial consistency, the spatial location of the delay segment is consistent with the original pixel coordinates of the reflectivity and temperature rise data. After aggregation, all temperature rise delay segments are numbered chronologically, and their corresponding reflectivity difference characteristic values ​​are recorded. At this point, each temperature rise delay segment not only contains temporal information about reflectivity characteristics and temperature rise response but also carries the correspondence between the optical behavior and thermal response of the enamel layer, providing a high-precision data source for subsequent backtracking of the thermal equilibrium rate.

[0059] In the stage of establishing and outputting the temperature rise delay segment list, all aggregated temperature rise delay segment data are organized according to time order and spatial location to form a complete temperature rise delay segment list. This list is stored in a tabular structure, with each row corresponding to a delay segment, including the delay start time, end time, duration, delay amplitude, spatial coordinates, and corresponding reflectivity difference parameters. Each data unit in the list is indexed and associated with the original reflectivity and temperature rise data, ensuring rapid retrieval to the corresponding data source during subsequent thermal equilibrium rate analysis. The temperature rise delay segment list formed in this way can fully reflect the temperature rise response lag distribution caused by reflectivity differences in the enamel layer of the cookware during the initial heating stage. The delay segment list is used as input data for subsequent thermal equilibrium rate analysis, maintaining consistent temporal, spatial, and physical properties from the preceding steps, providing complete data support for analyzing the thermal equilibrium changes of the cookware in different heating zones.

[0060] The thermal balance tracking module traces back the corresponding heating power curve and heat dissipation process curve based on the list of temperature rise delay segments, locates the thermal balance rate change segment, generates a list of temperature change trajectories, and provides input data for the formulation of heating control strategies.

[0061] To accurately locate the thermal equilibrium rate change segment and generate a temperature change trajectory list by corresponding the temperature rise delay segment list with the heating power curve and heat dissipation process curve, thus providing reliable input for the formulation of heating control strategy, the specific implementation steps are as follows:

[0062] In the synchronous extraction phase of power and heat dissipation curve data, based on the timestamps and spatial coordinates in the formed temperature rise delay segment list, the heating power output curve and heat dissipation behavior curve for the corresponding time period are extracted from the heating process record file. The heating power output curve reflects the energy input of the heating device in each time interval, while the heat dissipation process curve describes the distribution of heat released to the environment after the surface temperature of the cookware changes over time. To ensure data consistency, both the power curve and the heat dissipation curve are resampled with the same time step, so that each time point corresponds to a heating power value and a heat dissipation rate value. After synchronous extraction, the power curve and the heat dissipation curve are aligned with the start and end times of the temperature rise delay segment list on the time axis, forming three types of data structures with time as the main axis: power output data, heat dissipation response data, and temperature rise delay data. The time correlation established in this way allows the power and heat dissipation process to be interactively analyzed with the temperature rise delay segments in the same time dimension, providing a unified data foundation for the corresponding mapping in the next stage.

[0063] In the mapping stage of the delayed segments, each delay interval in the list of temperature rise delay segments is matched with the heating power curve and the heat dissipation curve. Specifically, using the start and end times of the delay segment as interval boundaries, power data for the same time period is extracted from the power curve, and heat dissipation data for the corresponding time period is extracted from the heat dissipation curve. This time-synchronized extraction method ensures that each temperature rise delay segment corresponds to a complete energy input and energy output record. Next, the spatial location of the delay segment is marked, establishing a one-to-one mapping relationship between the power curve and the heat dissipation curve and the delay segment in the spatial dimension. For multiple delay segments at the same spatial location, a hierarchical index is established according to time order to identify the thermal equilibrium change process at different heating stages in subsequent processing. Through the establishment of this mapping relationship, the changes in heating power, heat dissipation rate, and temperature rise lag phenomenon can be uniformly correlated in time and space, providing a precise analytical basis for locating the thermal equilibrium rate.

[0064] In the location analysis phase of the thermal equilibrium rate change, based on the mapped power curve, heat dissipation curve, and delay segment data, the dynamic balance between heat input and heat release of the cookware in each delay segment is analyzed. Specifically, within the time range corresponding to each delay segment, the rising or falling trend of the heating power curve is read, and the rate of change of the heat dissipation curve is simultaneously read to calculate the difference between the changes in energy input and energy release. When the rate of change of energy input and the rate of change of energy release show a continuous deviation, it indicates that the thermal equilibrium rate of the cookware has changed in that time segment. Based on this dynamic difference between energy input and energy release, the range of thermal equilibrium rate change is located. During the location process, the time sequence is kept consistent with the temperature rise delay segments, so that each thermal equilibrium rate change segment matches the corresponding delay segment. For thermal equilibrium changes at different time periods within the same spatial location, they are connected in series using a continuous marking method on the time axis, thereby reflecting the continuous trajectory of the thermal equilibrium state of the cookware surface evolving over time.

[0065] During the generation and organization of the temperature change trajectory list, all located thermal equilibrium rate change segments are categorized and organized according to time sequence and spatial coordinates to form a temperature change trajectory list. This list is organized in a tabular structure, with each record including the segment's start time, end time, duration, thermal equilibrium rate change value, corresponding heating power change, heat dissipation change, and spatial coordinates. This structured approach comprehensively describes the entire process of the cookware's transformation from energy input to thermal equilibrium during heating. The temperature change trajectory list not only reflects the dynamic thermal response of the enamel layer in different areas but also presents the correspondence between heating power and heat dissipation behavior, thus providing precise input for subsequent heating control strategy formulation. The organized temperature change trajectory list is stored as a continuous time series, which can be directly used to analyze the changing patterns of the thermal equilibrium rate in each area to guide the optimization and adjustment of heating time, pause intervals, and power triggering conditions.

[0066] The rhythm strategy generation module rearranges the heating time and pause intervals based on the temperature change trajectory list, determines the heating sequence and power triggering conditions, generates a thermomagnetic coordinated control scheme, and provides execution instructions for consistent thermal response adjustment.

[0067] Based on the temperature change trajectory list, the heating time and pause interval are rearranged to determine the heating sequence and power triggering conditions, and a thermomagnetic coordinated control scheme is generated. This scheme provides complete execution instructions for consistent thermal response adjustments. The specific implementation steps are as follows:

[0068] In the interval analysis stage of temperature trajectory data, based on the generated list of temperature change trajectories, the heat equilibrium rate change segments of each recorded data are analyzed in detail. By continuously reading the start time, end time, duration, and heat equilibrium rate change value of each segment, the dynamic laws of temperature rise and fall in each heating segment are determined. To ensure temporal consistency, all temperature change trajectories are arranged linearly along the time axis, maintaining a one-to-one correspondence between the heating power change trend and the temperature response. Through this continuous time analysis method, the acceleration, stability, and deceleration segments of the temperature rise rate during the heating process can be identified, and the temperature change gradient and its corresponding ratio with the power change are recorded in each segment. After analysis, a time series relationship set of temperature change and power response is formed, providing a precise parameter basis for subsequent time series reconstruction and power trigger condition setting.

[0069] During the redesign and planning phase of heating and pause timing, the original heating time and pause intervals are rearranged based on the different thermal response segments identified in the temperature change trajectory. For segments with excessively rapid temperature rise rates, the rate of heat accumulation is balanced by shortening the continuous heating duration and increasing short pause intervals; for segments with slow temperature rise rates, the continuity of energy input is improved by extending the heating time or reducing the pause interval. The adjustments to heating time and pause intervals maintain consistency with the original order of the temperature change trajectory list on the time axis to ensure that the adjustment of each heating segment is targeted at the corresponding thermal response behavior. During this process, the overall shape of the power curve remains continuous, with only minor adjustments made to the heating rhythm in local time periods, thus forming a heating time and pause interval distribution with time-adaptive characteristics. After rearrangement, each new heating and pause interval records its corresponding start and end times, duration, and power adjustment range, generating a heating rhythm planning table containing the timing redesign results, providing a clear basis for setting the power trigger conditions in the next stage.

[0070] In the stages of determining power triggering conditions and arranging the heating sequence, the heating rhythm planning table is used as input, and corresponding power triggering conditions are set according to the thermal balance changes in different thermal response segments. Power triggering conditions include power increase trigger points, power decrease trigger points, and power hold trigger points, corresponding to different stages of temperature rise rate changes. For segments with large fluctuations in the thermal balance rate, multiple triggering conditions are set to ensure that the heating power can respond quickly to sudden temperature changes; for segments with stable thermal balance rates, constant power triggering conditions are set to maintain stable heat output. The heating sequence is planned according to the thermal balance change sequence of different spatial regions in the temperature trajectory list, placing regions with slower thermal responses in the priority heating sequence to achieve synchronization of thermal responses in each region during the overall heating process. Each heating sequence unit includes the corresponding heating start time, power level, triggering condition type, and pause interval length. The heating sequence determined in this way can form a continuous and coordinated energy transfer path during the overall heating process, providing ordered execution logic for thermomagnetic coordinated control.

[0071] In the generation and execution command output stage of the thermomagnetic coordinated control scheme, the comprehensive results of the aforementioned heating time, pause interval, power triggering conditions, and heating sequence are integrated to generate a complete thermomagnetic coordinated control scheme. This scheme uses time as the main thread, uniformly planning the temporal relationship between power output and magnetic field distribution, enabling the induction heating device to achieve synchronous coordination of energy input and thermal response in different time intervals. To ensure the executability of the control scheme, the power output level, magnetic field phase state, and heating triggering conditions in each time period are defined as executable commands, forming a complete command sequence. The command sequence is stored in chronological order, with each command corresponding to a heating or pause action and including power adjustment amplitude and magnetic field phase parameters. During actual operation, the control unit executes the command sequence step by step, achieving dynamic rhythm adjustment of the cookware heating process, making the thermal response of each heating segment tend to be consistent. During execution, the thermomagnetic coordinated control scheme can automatically maintain the synergy between power and temperature changes, thereby forming a stable thermal response rhythm and providing a reliable foundation for subsequent rhythmic intervention to ensure consistent thermal response.

[0072] The energy intervention execution module performs rhythmic heating adjustment according to the thermomagnetic coordination control scheme. It inserts a short-time window of reflection shielding and a phase-opposite pulse in the thermal equilibrium rate offset interval, and simultaneously projects a virtual heat absorption period. Through rhythmic energy intervention, it keeps the thermal response of different cookware consistent during the induction heating process, thereby maintaining the stability of electromagnetic harmonic distribution.

[0073] Based on the thermomagnetic coordinated control scheme, rhythmic heating adjustment is implemented to ensure that different cookware maintains consistent thermal response during the heating process. Furthermore, within the thermal equilibrium rate deviation range, electromagnetic harmonic distribution is maintained stable through combined interventions of short-time reflection shielding windows, phase reversal pulses, and virtual heat absorption periods. The entire process unfolds according to the logical sequence of time, energy, and magnetic field coupling. The specific implementation steps are as follows:

[0074] In the timing identification and heating rhythm preparation stage of the offset interval, based on the power triggering conditions and heating sequence in the thermomagnetic coordinated control scheme generated in the previous stage, the corresponding thermal equilibrium rate offset segment in the temperature change trajectory list is read. By analyzing the degree of offset between the power output and thermal response curves on the heating time axis, the start time, end time, and duration of each offset interval are determined. Each offset interval corresponds to the uneven thermal response state of a local area on the cookware surface during a specific heating stage. To ensure that subsequent energy intervention actions are synchronized with the heating process, the heating time and pause interval in the thermomagnetic coordinated control scheme are remapped to the offset interval in this stage, ensuring that the energy adjustment action and the power output pulse are strictly aligned in the time dimension. In this way, the offset interval serves as the triggering benchmark for rhythmic intervention, establishing a unified timing basis for the subsequent insertion of reflection shielding, phase adjustment, and virtual heat absorption actions.

[0075] During the insertion and energy input suppression phase of the short-duration reflective shielding window, multiple extremely short-duration reflective shielding windows are inserted during the heating power output process based on the time information of the offset interval. These windows adjust the light source incident conditions or energy distribution to instantaneously reduce the reflected energy feedback from the enamel surface of the cookware, thereby weakening the local heat absorption capacity during that time period. When the thermal equilibrium rate offset interval shows excessively rapid energy accumulation, the reflective shielding window can suppress further concentrated energy input in a short time, making the heat distribution more even. During insertion, the duration and insertion interval of the reflective shielding window are synchronously adjusted according to the power trigger point in the thermomagnetic coordination control scheme, ensuring that the shielding action is effective only within the offset interval. After each shielding window ends, the heating power resumes its original rhythm, ensuring the overall continuity of energy output. Through the rhythmic superposition of multiple short-duration shieldings, the heat accumulation process on the cookware surface is smoothed out, preventing the formation of overheated zones and providing a more stable energy environment for subsequent phase reverse pulse adjustment.

[0076] In the phase-reverse pulse triggering and magnetic field dynamic balance adjustment stage, based on the energy input distribution state formed in the previous step, a phase-reverse pulse is triggered in the middle and later part of the thermal equilibrium rate offset interval. The phase-reverse pulse adjusts the excitation phase direction of the induction coil, causing a phase reversal in the magnetic field originally concentrated in the heating area within a short time, thereby changing the flow direction of the eddy currents and the energy distribution path. Triggering a phase-reverse pulse within the thermal equilibrium rate offset interval can generate reverse magnetic flux in energy-dense areas, thereby dispersing localized heat accumulation and promoting the redistribution of heat across the cookware surface. The phase-reverse pulse has a short duration, and its triggering frequency is synchronized with the heating power pulse, ensuring the continuity of magnetic field energy in space and time. To maintain magnetic field stability, the amplitude and duration of each reverse pulse are fine-tuned according to the energy accumulation level in the offset interval, ensuring that the magnetic field adjustment dissipates localized heat while maintaining the overall heating rhythm. By repeatedly triggering the phase-reverse pulse, a heating state with periodically alternating magnetic flux directions can be formed, resulting in a more uniform heat distribution and preventing further diffusion due to thermal response lag.

[0077] During the phase of coordinating and balancing the projection of the virtual heat absorption period and the overall thermal response, a virtual heat absorption period is introduced after the phase reversal pulse ends, according to the rhythmic instructions in the thermomagnetic coordinated control scheme. This virtual heat absorption period, by setting a brief energy absorption simulation interval in the energy control logic, allows the induction heating process to exhibit a dynamic balance between energy output and absorption within this timeframe. Specifically, the duration of the virtual heat absorption period coincides with the energy fallback time after the phase reversal pulse. This temporal coupling method ensures a stable thermal field distribution on the cookware surface for a short period. The introduction of the virtual heat absorption period not only slows down the continued rise in local temperature but also extends the energy diffusion process in time, allowing the thermal equilibrium rate to gradually return to the coordinated range. At this point, a continuous rhythmic intervention chain is formed between the aforementioned reflection shielding window, phase reversal pulse, and virtual heat absorption period, unfolding sequentially on the time axis, enabling the cookware's thermal response to achieve dynamic balance during heating. The execution instructions automatically switch according to the rhythmic sequence of the thermomagnetic coordinated control scheme during the control process, ensuring accurate execution of reflection shielding, phase reversal, and virtual heat absorption actions within each offset interval. After this stage of rhythmic heating adjustment, the thermal response curves of various areas on the surface of the cookware gradually become consistent in terms of time and temperature, thereby maintaining the stability of the electromagnetic harmonic distribution.

[0078] This invention constructs a complete quality control process consisting of reflective thermal imaging acquisition, delayed segment identification, thermal balance tracking, rhythm strategy generation, and energy intervention execution, enabling cookware to form a quantifiable and traceable thermal response control mechanism during induction heating. This scheme can accurately capture temperature rise deviations caused by differences in enamel layer reflectivity in the early stages of heating, and achieve dynamic coordination of the thermal responses of different cookware through rhythmic energy intervention, ensuring consistency in temperature change trajectories across test samples. This effectively eliminates thermal response deviations caused by batch differences in cookware, improving the repeatability and reliability of electromagnetic compatibility testing.

[0079] This invention achieves a balanced distribution of heating energy in time and space by introducing a short-time reflection shielding window, a phase-reversing pulse, and a virtual heat absorption period during the thermomagnetic coordinated control process. This process establishes a closed-loop feedback relationship between heating power output, magnetic field phase, and temperature response, preventing localized temperature drift caused by energy concentration and maintaining a stable electromagnetic field harmonic distribution. Through continuous thermal balance regulation, the stability of the cookware's electromagnetic response can be guaranteed over long-term testing periods, providing technical support for the consistency and reproducibility of standard loads.

[0080] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware, characterized in that: It includes a reflectance thermal imaging acquisition module, a delay segment recognition module, a thermal balance tracking module, a rhythm strategy generation module, and an energy intervention execution module: The thermal imaging module uses a unified light source in conjunction with thermal imaging equipment to synchronously record the reflective characteristics of the enamel surface of each cookware and the temperature rise process in the first three minutes of the initial heating stage, generating a table corresponding to the reflective data and the temperature rise data. The delayed segment identification module compares the reflection data and temperature rise data point by point in a correspondence table to identify the temperature rise delay time period caused by the difference in the reflectivity of the enamel layer, extracts the temperature rise delay segment information, and forms a list of temperature rise delay segments. The thermal balance tracking module traces back the corresponding heating power curve and heat dissipation process curve based on the list of temperature rise delay segments, locates the thermal balance rate change segment, and generates a list of temperature change trajectories. The rhythm strategy generation module rearranges the heating time and pause intervals based on the temperature change trajectory list, determines the heating sequence and power triggering conditions, and generates a thermomagnetic coordinated control scheme. The energy intervention execution module performs rhythmic heating adjustment according to the thermomagnetic coordination control scheme. It inserts a short-time window of reflection shielding and a phase-opposite pulse in the thermal equilibrium rate offset range, and simultaneously projects a virtual heat absorption period. Through rhythmic energy intervention, it keeps the thermal response of different cookware consistent during the induction heating process. The process of implementing rhythmic heating adjustment according to the thermomagnetic coordinated control scheme, inserting a short-time window of reflection shielding and a phase-reversed pulse within the thermal equilibrium rate offset interval, and projecting a virtual heat absorption period, to achieve consistent thermal response for different cookware through rhythmic energy intervention is as follows: Based on the power triggering conditions and heating sequence in the thermomagnetic coordinated control scheme, the thermal equilibrium rate offset segment in the temperature change trajectory list is read, the degree of offset between power output and thermal response curve is analyzed, the start time, end time and duration of the offset interval are determined, and the heating time and pause interval are mapped to the offset interval. A short-time window for reflection shielding is inserted within the offset interval. By adjusting the incident conditions of the light source, the energy feedback reflected by the enamel layer is reduced, local heat absorption is suppressed, and the heat distribution is balanced, so that the energy input process remains continuous. In the middle and later part of the offset interval, a phase reversal pulse is triggered to change the magnetic flux distribution path by adjusting the excitation phase direction of the induction coil, thereby dispersing local heat accumulation and maintaining a stable overall heating rhythm. After the phase-reverse pulse action ends, a virtual heat absorption period is introduced. By setting an energy absorption simulation interval, the energy diffusion process is extended, so that the thermal response of the cookware surface tends to be consistent and the electromagnetic harmonic distribution is kept stable.

2. The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware according to claim 1, characterized in that, The steps for generating the correspondence table between reflection data and temperature rise data are as follows: Using a unified light source in conjunction with thermal imaging acquisition equipment, the enamel surface of each cookware is illuminated. The incident angle of the light source remains constant with respect to the normal of the enamel surface, the spectral distribution covers the enamel reflection response range, and the luminous flux, illuminance and incident uniformity are adjusted by a photometer to create a uniform lighting environment on the irradiated surface. Place the cookware on a non-magnetic support platform, turn on the light source to illuminate it, record the initial state of the light distribution, and complete the optical acquisition reference setting; Initialize the thermal imaging acquisition device, align the detection field of view with the area illuminated by the light source, synchronize the frame rate, integration time and response bandwidth with the light source, acquire environmental reference frames and record the initial temperature distribution; During the initial heating stage, light source illumination and thermal image acquisition are started simultaneously. The illumination and ambient temperature are kept stable. The reflection data is converted into a reflectivity matrix, and the temperature rise data is converted into a temperature matrix and pixel registration is performed to form a correspondence table between reflection data and temperature rise data.

3. The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware according to claim 2, characterized in that, The synchronization process between light source illumination and thermal image acquisition is further defined as locking the time signal through unified timing control logic, so that the light source control signal and the thermal imaging acquisition signal are consistent, ensuring that the reflection data and temperature rise data are synchronously corresponding in time and space, thereby forming a complete pairing relationship between the reflectivity matrix and the temperature matrix.

4. The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware according to claim 2, characterized in that, The steps for creating the list of temperature rise delay segments are as follows: The table of correspondence between reflection data and temperature rise data is segmented according to time series, and the reflectivity curve and temperature curve are synchronously divided at a uniform time interval, so that the reflection data points and temperature data points maintain a one-to-one correspondence in time and space. By comparing the reflectance curve and the temperature rise curve point by point with time as the benchmark, the energy absorption delay phenomenon is identified in the time interval when the reflectance decreases but the temperature does not rise synchronously. The reflectance difference and the temperature change rate are recorded to determine the temperature rise delay time period. The identified temperature rise delay time periods are aggregated, and intervals with adjacent times and continuous delay trends are merged to generate temperature rise delay segments that include start and end times, duration, reflectivity change, and temperature rise rate change. The aggregated temperature rise delay segments are organized according to time sequence and spatial location to form a list of temperature rise delay segments.

5. The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware according to claim 4, characterized in that, Each temperature rise delay segment in the temperature rise delay segment list includes the change in reflectivity, the change in temperature rise rate, the spatial coordinates, and the time series index. After the delay segment list is generated, it is indexed and associated with the reflectivity data and the temperature rise data.

6. The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware according to claim 4, characterized in that, The steps to generate a list of temperature change trajectories are as follows: Based on the timestamps and spatial coordinates in the list of temperature rise delay segments, the heating power output curve and the heat dissipation process curve are extracted from the heating process record file. After being resampled with the same time step, they are aligned with the list of temperature rise delay segments on the time axis to form power output data, heat dissipation response data and temperature rise delay data. Match each delay interval in the list of temperature rise delay segments with the heating power curve and the heat dissipation curve, extract the data of the corresponding time period and establish a spatial mapping relationship so that the power curve and the heat dissipation curve correspond one-to-one with the delay segment; Based on the mapped power curve, heat dissipation curve, and delay segment data, analyze the dynamic differences between changes in energy input and energy release, locate the thermal equilibrium rate change segment, and maintain consistency in time sequence. The identified thermal equilibrium rate change segments are organized in chronological order and spatial coordinates to form a list of temperature change trajectories.

7. The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware according to claim 6, characterized in that, When locating the thermal equilibrium rate change segment, the rising and falling trends of the heating power curve are read and the rate of change of the heat dissipation curve is read simultaneously. The difference between the change in energy input and the change in energy release is calculated. When there is a continuous deviation between the rate of change in energy input and the rate of change in energy release, the thermal equilibrium rate change segment is determined. Adjacent change segments are continuously marked according to the time sequence to form a complete thermal equilibrium evolution trajectory.

8. The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware according to claim 6, characterized in that, The steps for generating a thermomagnetic coordinated control scheme are as follows: Based on the temperature change trajectory list, the thermal equilibrium rate change segment is analyzed, and the start time, end time, duration and thermal equilibrium rate change value are read to determine the dynamic law of temperature rise and fall, and form a time series relationship group of temperature change and power response. Based on the thermal response segments in the temperature change trajectory, the heating time and pause interval are rearranged. By shortening or extending the heating time and adjusting the pause interval, a heating rhythm planning table is formed so that the power curve remains continuous in local time periods. Using the heating rhythm planning table as input, the power increase, decrease and hold trigger conditions are set according to the changes in heat balance, and the heating sequence is planned according to the order of heat balance changes to form a heating sequence unit; The heating time, pause interval, power triggering conditions, and heating sequence are integrated to generate a thermomagnetic coordinated control scheme and output an execution command sequence.

9. The full-process quality control system for standard load cookware used in electromagnetic compatibility testing of induction cookware according to claim 8, characterized in that, When generating a thermomagnetic coordinated control scheme, the power output level and the magnetic field phase state are defined synchronously in time sequence. Each time period includes heating trigger conditions and pause interval parameters. The execution command sequence is output sequentially with time as the main line, so that the power change and temperature response are coordinated during the induction heating process.

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