Electric ceramic cooker and control method thereof

Abstract

The invention provides an electric ceramic cooker and a control method thereof. The method comprises the following steps: determining a cooking mode and a gear of the electric ceramic cooker; when the electric ceramic cooker heats the cookware according to the cooking mode and the gear, the heating temperature of the electric ceramic cooker is detected; self-adaptive regularization compensation is carried out on the heating temperature according to the cooking mode, and the estimated temperature of the cookware is obtained; determining a rate of change based on the estimated temperature; and adjusting the gear of the electric ceramic cooker according to the abnormal cooking event of the cooker represented by the estimated temperature and the change rate. The temperature of the cooker during cooking is inferred according to the cooking mode on the basis of the heating temperature of the electric ceramic cooker, potential or already-occurring abnormal cooking events of the cooker are calculated and judged in combination with the estimated temperature of the cooker and the change condition of the estimated temperature, the gears of the electric ceramic cooker are adjusted accordingly, intelligent temperature control is achieved, the safety of the electric ceramic cooker is guaranteed, and the cooking efficiency is improved. The cost is effectively reduced, the operation is simple and convenient, and the efficiency of detecting and preventing the abnormal cooking event of the cookware is effectively improved.

Description

Technical Field

[0001] This invention relates to stove equipment, and in particular to an electric ceramic stove and its control method. Background Technology

[0002] The working mode of an electric ceramic cooktop is that the heating element generates heat radiation, and the microcrystalline panel conducts the heat to the bottom of the cookware, thus heating the cookware. The temperature resistance limit of the microcrystalline panel is 600℃-700℃. When the heat generation exceeds the heat transfer, the microcrystalline panel will accumulate heat, and the cookware is prone to abnormal cooking events such as dry burning and water overflow.

[0003] One way to detect abnormal cooking events with cookware is to connect the electric ceramic cooktop and range hood to the Internet of Things. The range hood uses sensors such as cameras and infrared to detect the status of the cookware and controls the electric ceramic cooktop when abnormal cooking events may have occurred or have already occurred.

[0004] However, this method relies on a range hood and the electric ceramic cooktop is located under the range hood, which is costly. Furthermore, the operation of IoT access and configuration is cumbersome, resulting in low efficiency in detecting and preventing abnormal cooking events. Summary of the Invention

[0005] The first technical problem solved by this invention is to provide a control method for an electric ceramic stove that effectively improves the efficiency of detecting and preventing abnormal cooking events in cookware.

[0006] The second technical problem solved by the present invention is to provide an electric ceramic stove that effectively improves the efficiency of detecting and preventing abnormal cooking events in cookware.

[0007] The first technical problem mentioned above is solved by the following technical solution: A method for controlling an electric ceramic stove includes: Determine the cooking mode and setting of the electric ceramic stove; When the electric ceramic stove heats the cookware according to the cooking mode and the setting, the heating temperature of the electric ceramic stove is detected; The heating temperature is adaptively regularized and compensated according to the cooking mode to obtain the estimated temperature of the cookware. The rate of change is determined based on the estimated temperature; The setting of the electric ceramic stove is adjusted based on the abnormal cooking events of the cookware characterized by the estimated temperature and the rate of change.

[0008] Compared with the prior art, the control of the electric ceramic stove described in this invention has the following advantages: In this embodiment, the cooking mode and power level of the ceramic cooktop are determined; when the ceramic cooktop heats the cookware according to the cooking mode and power level, the heating temperature of the ceramic cooktop is detected; adaptive regularization compensation is applied to the heating temperature based on the cooking mode to obtain the estimated temperature of the cookware; the rate of change of the estimated temperature is statistically analyzed; and the power level of the ceramic cooktop is adjusted based on the abnormal cooking events of the cookware represented by the estimated temperature and the rate of change. This embodiment uses the heating temperature of the ceramic cooktop itself as a benchmark to infer the temperature of the cookware during cooking based on the cooking mode, and calculates and judges potential or actual abnormal cooking events of the cookware by combining the estimated temperature of the cookware and its changes, and adjusts the power level of the ceramic cooktop accordingly. This achieves intelligent control, ensures the safety of the ceramic cooktop, and does not rely on other external home appliances or the Internet of Things during the control process, effectively reducing costs and simplifying operation, thereby effectively improving the efficiency of detecting and preventing abnormal cooking events of the cookware.

[0009] The second technical problem mentioned above is solved by the following technical solution: An electric ceramic cooker includes a control panel, a heating plate, a thermocouple, and a microcrystalline panel; the control panel is provided with a first button and a second button; the thermocouple is disposed in the heating plate, the microcrystalline panel is disposed on the heating plate, and a cookware is placed on the microcrystalline panel; The first button is used to determine the cooking mode of the electric ceramic stove; The second button is used to determine the power setting of the electric ceramic stove; The thermocouple is used to detect the heating temperature of the heating plate when the heating plate heats the cookware according to the cooking mode and setting. The control panel is used to perform adaptive regularization compensation on the heating temperature according to the cooking mode to obtain the estimated temperature of the cookware; determine the rate of change based on the estimated temperature; and adjust the setting of the electric ceramic stove according to the abnormal cooking events of the cookware represented by the estimated temperature and the rate of change.

[0010] The second technical problem mentioned above is solved by the following technical solution: An electric ceramic stove includes a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that the processor executes the computer program to implement a control method for the electric ceramic stove.

[0011] Compared with the prior art, the electric ceramic stove described in this invention has the following beneficial effects: In this embodiment, the cooking mode and power level of the ceramic cooktop are determined; when the ceramic cooktop heats the cookware according to the cooking mode and power level, the heating temperature of the ceramic cooktop is detected; adaptive regularization compensation is applied to the heating temperature based on the cooking mode to obtain the estimated temperature of the cookware; the rate of change is determined based on the estimated temperature; and the power level of the ceramic cooktop is adjusted based on the abnormal cooking events of the cookware represented by the estimated temperature and the rate of change. This embodiment uses the heating temperature of the ceramic cooktop itself as a benchmark to infer the temperature of the cookware during cooking based on the cooking mode, and calculates and judges potential or already occurring abnormal cooking events of the cookware by combining the estimated temperature of the cookware and its changes, and adjusts the power level of the ceramic cooktop accordingly. This achieves intelligent temperature control, ensures the safety of the ceramic cooktop, and does not rely on other external home appliances or the Internet of Things during the temperature control process, effectively reducing costs and simplifying operation, thereby effectively improving the efficiency of detecting and preventing abnormal cooking events of the cookware. Attached Figure Description

[0012] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0013] Figure 1 A schematic diagram of a control method for an electric ceramic stove provided in an embodiment of the present invention; Figure 2 This is a schematic diagram of the internal structure of an electric ceramic stove provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the external structure of an electric ceramic stove provided in an embodiment of the present invention; Figure 4 A schematic diagram illustrating the placement of cookware on an electric ceramic stove, provided as an embodiment of the present invention; Figure 5 A schematic diagram of an electric ceramic stove provided in an embodiment of the present invention; Figure 6 This is a schematic diagram of an electric ceramic stove provided in an embodiment of the present invention.

[0014] Labeling explanation: 200, control panel; 210, heating plate; 220, thermocouple; 230, microcrystalline glass panel; 231, heating zone; 240, cookware. Detailed Implementation

[0015] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0016] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0017] The technical solution of the present invention will be illustrated below through specific embodiments.

[0018] Reference Figure 1 The diagram illustrates a control method for an electric ceramic stove according to an embodiment of the present invention, which may specifically include the following steps: Step 101: Determine the cooking mode and setting of the electric ceramic stove.

[0019] Electric ceramic stoves are appliances that utilize resistance Joule heating and far-infrared radiation heating, such as... Figure 2 , Figure 3 and Figure 4 As shown, the electric ceramic stove includes a control panel 200, a heating plate 210, a thermocouple 220, a microcrystalline glass panel 230, etc. The microcrystalline glass panel 230 includes one or more heating zones 231, and the cookware 240 is placed on the microcrystalline glass panel 230 (especially the heating zone 231).

[0020] The control board is the carrier of hardware circuits and software programs, responsible for receiving button commands, processing temperature signals, adjusting gears, and executing protection logic.

[0021] The control board has multiple physical buttons, memory, processor and various circuits (such as power control circuit, sampling circuit (such as amplifier circuit, filter circuit, A / D (analog / digital) conversion circuit, etc.), safety alarm circuit, etc.).

[0022] The memory can be used to store software programs and various data. The memory 1209 may mainly include a program storage area and a data storage area. The program storage area can store at least one application program required for a function (such as control programs for various cooking modes, control programs for common cooking events, etc.); the data storage area can store data created based on the use of the electric ceramic stove (such as the heating temperature of the electric ceramic stove, the estimated temperature of the cookware, etc.).

[0023] The processor, including MCU (Microcontroller Unit), is the control center of the ceramic cooker. It connects various parts of the ceramic cooker through various interfaces and lines. By running or executing software programs and / or modules stored in the memory, and calling data stored in the memory, it performs various functions of the ceramic cooker and processes data, thereby monitoring the ceramic cooker as a whole.

[0024] The physical buttons on the control panel include mechanical buttons and touch buttons. One physical button is the first button, which is used to determine the cooking mode of the electric ceramic cooker, and the other physical button is the second button, which is used to determine the power setting of the electric ceramic cooker.

[0025] Each cooking mode has corresponding control parameters, such as power curve, temperature limit, gear range and constant temperature logic, to adapt to the heating needs of different cooking scenarios.

[0026] For example, cooking modes include at least two categories: water cooking and oil cooking. Water cooking refers to modes that rely on water, such as boiling water, steaming, cooking porridge, making soup, and stewing meat. Oil cooking refers to modes that rely on oil, such as frying, deep-frying, and stir-frying. Generally speaking, cooking with water relies on fewer calories than cooking with oil.

[0027] In addition, the settings include multiple levels, each with corresponding control parameters such as power, cycle, heating time, and duty cycle, which work in conjunction with the cooking mode.

[0028] For example, a certain ceramic cooktop has 7 power levels. The first level has a power of 200W, a cycle time of 2000ms, a heating time of 20ms, and a duty cycle of 10. The second level has a power of 500W, a cycle time of 2000ms, a heating time of 60ms, and a duty cycle of 30. The third level has a power of 800W, a cycle time of 2000ms, a heating time of 80ms, and a duty cycle of 40. The fourth level has a power of 1200W, a cycle time of 2000ms, a heating time of 80ms, and a duty cycle of 10. The first level has a cycle of 2000ms, a heating time of 1200ms, and a duty cycle of 60. The second level has a power of 1500W, a cycle of 2000ms, a heating time of 1600ms, and a duty cycle of 80. The third level has a power of 1800W, a cycle of 2000ms, a heating time of 1800ms, and a duty cycle of 90. The fourth level has a power of 2100W, a cycle of 2000ms, a heating time of 2000ms, and a duty cycle of 100.

[0029] The heating plate is the heat-generating component of the electric ceramic stove. It mostly uses resistance heating wires made of nickel-chromium alloy, iron-chromium-aluminum, etc., which are wound in a ring and evenly on a mica or ceramic high-temperature resistant frame. The back of the plate is equipped with aluminum silicate insulation cotton or insulation board to block heat conduction downward and avoid damage to the internal circuit. The wiring terminals are made of high-temperature resistant ceramic material to achieve a stable connection of the high-voltage circuit.

[0030] Generally, the rated power of the heating plate covers 100W-2200W, and the power can be linearly adjusted according to the corresponding level. It can heat up to more than 700℃ in a few seconds at room temperature, and the peak working temperature can reach 900℃. It features uniform heating, no open flame, and the ability to reuse residual heat. It is suitable for various cooking scenarios such as frying, stir-frying, stewing, boiling, and baking.

[0031] The heating plate can be fixed in the center inside the furnace body, directly facing the heating area of ​​the microcrystalline glass panel, with a pre-drilled hole in the center for embedding a thermocouple to achieve accurate temperature acquisition.

[0032] Thermocouples are responsible for functions such as constant temperature control and overheat protection. They work based on the Seebeck effect and consist of a closed circuit composed of two conductors of different materials. When there is a temperature difference between the two ends, the circuit generates a thermoelectric potential, and the control board converts the thermoelectric potential signal into a real-time temperature value.

[0033] For example, electric ceramic stoves often use K-type thermocouples (nickel-chromium-nickel-silicon), whose temperature measurement range covers -20℃ to 1300℃.

[0034] Thermocouples are typically embedded in the center of the heating element, with their tops pressed against the back of the microcrystalline glass panel, allowing for real-time temperature monitoring of the furnace surface and the heating element.

[0035] Microcrystalline panels are typically made of lithium aluminum silicon microcrystalline glass, which covers the top of the ceramic cooktop and supports the cookware. The back of the microcrystalline panel is marked with heating rings (i.e., heating zones) to guide the cookware to be placed in the center and match the position of the heating plate below, ensuring uniform heating.

[0036] In practical applications, users can trigger the first button by short pressing or long pressing to switch between various cooking modes and select a cooking mode. Users can also trigger the second button by short pressing or long pressing to switch between various gear levels and select a gear level.

[0037] Step 102: When the electric ceramic stove is heating the cookware according to the cooking mode and setting, detect the heating temperature of the electric ceramic stove.

[0038] When determining the cooking mode and power level of the electric ceramic cooker, you can start the operation according to the control parameters corresponding to the cooking mode and the power level. The power output of each power level is controlled according to the heating duty cycle of each power level. When the current passes through the resistive heating element in the heating plate, it generates Joule heat and simultaneously releases far-infrared radiation waves. The heat energy penetrates the microcrystalline panel to directly heat the cookware through heat conduction, far-infrared radiation and other means.

[0039] As the temperature rises, the temperature of the thermocouple also rises. The thermocouple transmits its voltage to the processor on the control board at a preset frequency through a sampling circuit (such as amplification, filtering, analog-to-digital conversion, etc.). The processor converts the thermocouple voltage into the heating temperature of the electric ceramic stove, providing data for the software program's functions such as gear adjustment and constant temperature control.

[0040] Generally, the memory contains multiple temperature thresholds built into the thermocouple. When triggered, it can perform protective actions, such as cutting off heating when dry burning or overheating (>600℃), stopping the furnace to cool down when the furnace body is overheated, and triggering a high-temperature anti-scalding reminder when the residual temperature is detected after shutdown (>50℃), etc.

[0041] In this embodiment, a control program with a higher priority than the temperature threshold of the thermocouple can be provided for common cooking events (such as dry burning, water overflow, etc.) to achieve more accurate protection actions.

[0042] Step 103: Perform adaptive regularization compensation on the heating temperature according to the cooking mode to obtain the estimated temperature of the cookware.

[0043] Due to limitations in structure, cost, and installation difficulty, the thermocouples of electric ceramic cooktops are usually embedded in the center of the heating plate or close to the back of the microcrystalline glass panel, rather than directly contacting the bottom of the cookware. In this case, the heating temperature measured by the thermocouple is the temperature at which the heating plate and the microcrystalline panel meet, rather than the actual temperature of the bottom of the cookware (especially the bottom of the cookware), and there is a temperature difference in heat transfer between the two.

[0044] Therefore, the heating temperature of the ceramic cooker and the actual temperature of the cookware (especially the bottom of the cookware) can be collected by thermocouples in environments such as laboratories. A linear or nonlinear temperature conversion function can be constructed to establish the relationship between the heating temperature of the ceramic cooker and the actual temperature of the cookware (especially the bottom of the cookware). Furthermore, considering that the power curves of different cooking modes of the ceramic cooker are different and the dynamic changes of temperature difference are also different, the cooking mode of the ceramic cooker can be used for regularization compensation in the temperature conversion to improve the accuracy of temperature conversion.

[0045] Then, the current heating temperature of the electric ceramic stove is substituted into the variation function for calculation, and the current cooking mode of the electric ceramic stove is adaptively regularized and compensated in the variation function, and the estimated temperature of the current cookware (especially the bottom of the cookware) is also estimated.

[0046] In one embodiment of the present invention, step 103 may include the following steps: Step 1031: Generate the first compensation value as the regularization term according to the cooking mode.

[0047] In this embodiment, a first compensation value can be constructed as a regularization term according to the cooking mode. The first compensation value is positively correlated with the calories that the cooking mode depends on. That is, the higher the calories that the cooking mode depends on, the larger the first compensation value, and vice versa.

[0048] In one construction method, a compensation table can be pre-made, which records the mapping relationship between cooking modes (represented by IDs, etc.) and first compensation values.

[0049] In this construction method, the first compensation value currently used as a regular expression term can be queried in the compensation table based on the identifier of the current cooking mode. This construction method is simple to operate, and its compensation accuracy basically meets the temperature control requirements of most cooking scenarios.

[0050] In another approach, control parameters of the cooking mode can be collected in environments such as laboratories and a suitable regularization term can be fitted. A linear or nonlinear regularization transformation function can then be constructed based on the relationship between the control parameters of the cooking mode and the regularization term.

[0051] In this construction method, the control parameters of the current cooking mode can be substituted into the regularization transformation function to obtain the first compensation value as the regularization term. This construction method has high compensation accuracy and basically meets the temperature control requirements of specific cooking scenarios.

[0052] Step 1032: Use the control parameters in the gear position to generate a second compensation value.

[0053] The heating plate of an electric ceramic cooker is usually a pure resistance Joule heating type. Under the conditions that the mains voltage is stable and the resistance of the heating wire (such as nickel-chromium alloy, iron-chromium-aluminum alloy, etc.) fluctuates little (<5%) within the working temperature range, there is a correlation between the heat output of the heating plate per unit time and the control parameters in the electric ceramic cooker settings.

[0054] Thermocouples are usually installed in the center of the heating plate, close to the back of the microcrystalline glass panel, and cannot directly contact the bottom of the cookware. They measure the temperature of the microcrystalline panel and the heating plate. There is a temperature difference between the actual temperature of the bottom of the cookware and the measured temperature (i.e., the heating temperature). This temperature difference is related to the control parameters in the settings of the electric ceramic cooker.

[0055] In this embodiment, the control parameters in the gear position can be used to generate a second compensation value to compensate for the existence of temperature difference.

[0056] Because thermocouples are contact temperature sensing elements, they have thermal inertia and temperature measurement lag. When the user adjusts the setting or an abnormal cooking event occurs (such as dry burning), the heat output and / or accumulated heat of the heating plate may change instantaneously. The temperature of the thermocouple takes a relatively long time (such as several seconds or even tens of seconds) to keep up with the actual heat flow change, which can easily lead to problems such as overshoot and under-temperature.

[0057] The control parameters in the gear selection are control quantities output by controllers such as the MCU. Based on these parameters, changes in heat flow and temperature difference can be predicted in real time, allowing for temperature compensation to be completed in advance without relying on the delayed feedback from thermocouples. This composite control of feedforward compensation and thermocouple feedback effectively reduces temperature measurement errors under dynamic operating conditions.

[0058] For example, the control parameters in the gear position include the duty cycle, which is the proportion of time the bidirectional thyristor is turned on within a unit control cycle. This is the PWM (Pulse-Width Modulation) control signal output by the MCU and other controllers. The duty cycle is positively correlated with the gear level (power). That is, the higher the gear level, the higher the power and the larger the corresponding duty cycle. Conversely, the lower the gear level, the lower the power and the smaller the corresponding duty cycle.

[0059] According to Joule's law, the amount of heat generated by the heating element per unit time is positively correlated with the duration of power-on, which means that the amount of heat generated by the heating element per unit time is linearly positively correlated with the duty cycle.

[0060] Therefore, a second compensation value can be generated independently based on the duty cycle. Specifically, the heating time of the electric ceramic stove (especially the heating plate) heating the cookware can be counted, the product between the heating time and the duty cycle can be calculated to obtain the effective heating time of the electric ceramic stove (especially the heating plate) heating the cookware, and the ratio between the effective heating time and the preset conversion coefficient can be calculated to obtain the second compensation value. Here, the conversion coefficient represents a constant that converts the effective heating time of the electric ceramic stove into a temperature compensation value.

[0061] Therefore, the second compensation value is expressed as: duty×Δt / A; where duty is the heating time of the pot, Δt is the duty cycle, and A is the preset conversion coefficient.

[0062] Step 1033: Use the first compensation value and the second compensation value to compensate for the heating temperature and obtain the estimated temperature of the cookware.

[0063] In this embodiment, the heating temperature detected by the thermocouple can be compensated using the first compensation value and the second compensation value to obtain the estimated temperature of the cookware (especially the bottom of the cookware).

[0064] In one compensation method, the estimated temperature of the cookware (especially the bottom of the cookware) can be obtained by subtracting the first compensation value and the second compensation value from the heating temperature detected by the thermocouple.

[0065] In this compensation method, the temperature conversion function can be expressed as: T=T0-duty×Δt / AB, where T is the estimated temperature of the cookware (especially the bottom of the cookware), T0 is the heating temperature detected by the thermocouple, duty is the heating time of the cookware, Δt is the duty cycle, A is the conversion coefficient, and B is the first compensation value of the cooking mode.

[0066] For example, if the conversion coefficient is 1000, the first compensation value for water cooking is 200, and the first compensation value for oil cooking is 300, then the temperature conversion function for water cooking can be expressed as: T=T0-duty×Δt / 1000-200, and the temperature conversion function for oil cooking can be expressed as: T=T0-duty×Δt / 1000-300.

[0067] This embodiment compensates for the heating temperature detected by the thermocouple at the software level based on the control parameters of the gear (such as duty cycle) and cooking mode, making up for the physical limitations of the thermocouple in hardware structure. It achieves accurate estimation of the true temperature of the bottom of the pot in a low-cost and highly reliable manner, and optimizes the temperature control logic for different cooking modes and gears to achieve personalized temperature control for modular cooking.

[0068] Step 104: Determine the rate of change based on the estimated temperature.

[0069] When the electric ceramic stove initially heats the cookware (which contains water, food, etc.), the temperature of the cookware rises rapidly. As the temperature of the cookware approaches the boiling point, the temperature of the cookware remains stable because the water continues to evaporate and takes away a large amount of heat. At this point, the rate of change of the cookware temperature tends to be 0.

[0070] If an abnormal cooking event occurs in the cookware (such as dry burning or overflowing), the temperature of the cookware will fluctuate significantly again. At this time, the rate of temperature change of the cookware will change more noticeably.

[0071] Therefore, in this embodiment, the rate of change of the temperature of the cookware (especially the bottom of the cookware) over a recent period can be estimated to identify the cooking status of the cookware and determine whether an abnormal cooking event has occurred.

[0072] In one embodiment of the present invention, step 104 may include the following steps: Step 1041: Determine the window and counter.

[0073] In this embodiment, a window BUF can be set, and the maximum capacity (i.e., size) within the window BUF is m, where m is a positive integer. For example, 100≤m≤200.

[0074] In addition, a counter pos_cnt can be initialized to 0.

[0075] Step 1042: Write the current estimated temperature into the corresponding position of the counter in the window, and increment the counter by 1.

[0076] When generating the estimated temperature of the cookware (especially the bottom of the cookware), the current estimated temperature of the cookware (especially the bottom of the cookware) can be written to the position corresponding to the counter in the window, that is, the position where the value is the same as the counter, and the counter can be incremented by 1.

[0077] The accumulation process can be represented as pos_cnt = pos_cnt + 1.

[0078] Step 1043: If the counter is greater than or equal to the value corresponding to the maximum capacity position within the window, then the counter is reset to zero, and the estimated temperature change rate stored within the window is statistically analyzed.

[0079] When the counter is incremented by 1, the relationship between the counter and the value m corresponding to the maximum capacity (i.e., size) within the window can be determined.

[0080] If the counter is less than the value m corresponding to the maximum capacity position (i.e., size) within the window, return to step 1042 and continue to calculate the estimated temperature of the cookware (especially the bottom of the cookware) and the count of the cumulative counter.

[0081] If the counter is greater than or equal to the value m corresponding to the maximum capacity position (i.e., size) within the window, then the estimated rate of change of the cookware (especially the bottom of the cookware) stored within the window is statistically calculated.

[0082] For example, the estimated temperatures of each cookware (especially the bottom of the cookware) stored in the window are traversed, the estimated temperature with the largest value and the estimated temperature with the smallest value are selected, the difference between the estimated temperature with the largest value and the estimated temperature with the smallest value is calculated to obtain the temperature amplitude; the total number of estimated temperatures stored in the window is counted; the ratio between the temperature amplitude and the total number is calculated as the rate of change of the estimated temperature in the window.

[0083] In this example, the rate of change of the estimated temperature within the window can be expressed as: K = (V_MAX - V_MIN) / m, where K is the rate of change of the estimated temperature within the window, V_MAX is the estimated temperature with the largest value, V_MIN is the estimated temperature with the smallest value, and m is the size of the window.

[0084] This embodiment uses a window and calculator to statistically estimate the rate of temperature change. The calculation is simple and suitable for operation in resource-constrained controllers such as MCUs.

[0085] Step 105: Adjust the power level of the induction cooker according to the abnormal cooking event of the cookware characterized by the estimated temperature and the rate of change.

[0086] In this embodiment, the estimated temperature of the cookware (especially the bottom of the cookware) and its rate of change can be combined to identify the abnormal cooking events that have occurred or may potentially occur in the cookware, so as to adjust the power level of the induction cooker for the abnormal cooking events, achieve protection operations, and ensure the safety of cooking.

[0087] In one case, if there is no water in the cookware to absorb heat, dry burning (abnormal cooking event) will occur. At this time, from the heating plate, the ceramic glass panel to the bottom of the cookware, heat accumulates, and the temperature at the bottom of the cookware continues to rise rapidly. For this, conditions indicating dry burning can be set, denoted as dry burning conditions.

[0088] Exemplarily, the dry burning conditions include that the estimated temperature T of the cookware (especially the bottom of the cookware) is greater than a preset first temperature threshold (such as T > 300), and the rate of change K of the estimated temperature of the cookware (especially the bottom of the cookware) is greater than a preset first fluctuation threshold (such as K > 20).

[0089] Compare the current estimated temperature of the cookware (especially the bottom of the cookware) and its rate of change with the preset dry burning conditions.

[0090] When the current estimated temperature of the cookware (especially the bottom of the cookware) and its rate of change meet the preset dry burning conditions, count the duration during which the estimated temperature and the rate of change meet the preset dry burning conditions, and compare the duration with a preset first time threshold (such as 30 seconds). / /

[0091] If the duration is greater than or equal to the preset first time threshold, indicating that dry burning has occurred or may occur in the cookware, set the level of the power level to 0 to turn off the output of the heating plate and stop the induction cooker (especially the heating plate) from heating the cookware.

[0092] In another case, if the water in the cookware overflows and flows onto the ceramic glass panel, water overflow (abnormal cooking event) will occur. At this time, a large amount of heat is absorbed during water evaporation, and the temperature at the bottom of the cookware stops rising and may even drop. For this, conditions indicating water overflow can be set, denoted as water overflow conditions.

[0093] Exemplarily, the water overflow conditions include that the estimated temperature T of the cookware (especially the bottom of the cookware) is greater than a preset second temperature threshold and less than a preset third temperature threshold (such as 100 < T < 150), and the rate of change K of the estimated temperature of the cookware (especially the bottom of the cookware) is less than a preset second fluctuation threshold (such as K < 5).

[0094] Among them, both the second temperature threshold and the third temperature threshold are less than the first temperature threshold, and the second fluctuation threshold is less than the first fluctuation threshold.

[0095] If the cooking mode is water cooking and the estimated temperature and rate of change of the pot (especially the bottom of the pot) meet the overflow conditions, then lower the setting to the lowest level to prevent the water from overflowing outside the pot after boiling.

[0096] After the estimated temperature and rate of change meet the overflow conditions, the estimated temperature change of the cookware (especially the bottom of the cookware) is statistically analyzed at preset time intervals (such as 1 minute).

[0097] If the change is negative (i.e., the estimated temperature of the cookware (especially the bottom of the cookware) drops) and the change is greater than the preset fourth temperature threshold (e.g., 5℃), then the setting will be increased by one level.

[0098] In this embodiment, the cooking mode and power level of the ceramic cooktop are determined; when the ceramic cooktop heats the cookware according to the cooking mode and power level, the heating temperature of the ceramic cooktop is detected; adaptive regularization compensation is applied to the heating temperature based on the cooking mode to obtain the estimated temperature of the cookware; the rate of change is determined based on the estimated temperature; and the power level of the ceramic cooktop is adjusted based on the abnormal cooking events of the cookware represented by the estimated temperature and the rate of change. This embodiment uses the heating temperature of the ceramic cooktop itself as a benchmark to infer the temperature of the cookware during cooking based on the cooking mode, and calculates and judges potential or already occurring abnormal cooking events of the cookware by combining the estimated temperature of the cookware and its changes, and adjusts the power level of the ceramic cooktop accordingly. This achieves intelligent temperature control, ensures the safety of the ceramic cooktop, and does not rely on other external home appliances or the Internet of Things during the temperature control process, effectively reducing costs and simplifying operation, thereby effectively improving the efficiency of detecting and preventing abnormal cooking events of the cookware.

[0099] It should be noted that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of the present invention.

[0100] Reference Figure 5 The diagram shows a schematic of an electric ceramic stove according to an embodiment of the present invention. The electric ceramic stove includes a control board 500, a heating plate 510, a thermocouple 520, and a microcrystalline panel 530. The control board is provided with a first button 501 and a second button 502. The thermocouple 520 is disposed in the heating plate 510, and the microcrystalline panel 530 is disposed on the heating plate 510. A pot is placed on the microcrystalline panel 530. The first button 501 is used to determine the cooking mode of the electric ceramic stove; The second button 502 is used to determine the power setting of the electric ceramic stove; The thermocouple 520 is used to detect the heating temperature of the heating plate 510 when the heating plate 510 heats the cookware according to the cooking mode and setting. The control board 500 is used to perform adaptive regularization compensation on the heating temperature according to the cooking mode to obtain the estimated temperature of the cookware; determine the rate of change based on the estimated temperature; and adjust the setting of the electric ceramic stove according to the abnormal cooking events of the cookware represented by the estimated temperature and the rate of change.

[0101] In one embodiment of the present invention, the control board 500 is further configured to: A first compensation value is generated as a regularization term according to the cooking mode; the first compensation value is positively correlated with the calories on which the cooking mode depends; A second compensation value is generated using the control parameters in the gear position; The heating temperature is compensated using the first compensation value and the second compensation value to obtain the estimated temperature of the cookware.

[0102] In one embodiment of the present invention, the control parameters in the gear position include the duty cycle, and the second compensation value is expressed as: duty×Δt / A; where duty is the heating time of the pot, Δt is the duty cycle, and A is a preset conversion coefficient.

[0103] In one embodiment of the present invention, the control board 500 is further configured to: The estimated temperature of the cookware is obtained by subtracting the first compensation value and the second compensation value from the heating temperature.

[0104] In one embodiment of the present invention, the control board 500 is further configured to: Define the window and counter; Write the current estimated temperature to the position corresponding to the counter in the window, and increment the counter by 1; If the counter is greater than or equal to the value corresponding to the maximum capacity position within the window, then the counter is reset to zero, and the estimated temperature change rate stored within the window is statistically analyzed.

[0105] In one embodiment of the present invention, the control board 500 is further configured to: Within the window, the difference between the estimated temperature with the largest value and the estimated temperature with the smallest value is calculated to obtain the temperature amplitude. Count the total number of estimated temperatures within the window; The ratio between the temperature amplitude and the total quantity is calculated as the rate of change of the estimated temperature within the window.

[0106] In one embodiment of the present invention, the control board 500 is further configured to: The duration for which the estimated temperature and the rate of change meet preset dry-burning conditions is statistically analyzed; the dry-burning conditions include the estimated temperature being greater than a preset first temperature threshold and the rate of change being greater than a preset first fluctuation threshold. If the duration is greater than or equal to a preset first time threshold, the level of the gear is set to 0 to stop the electric ceramic stove from heating the cookware.

[0107] In one embodiment of the present invention, the cooking mode includes water cooking, and the control panel 500 is further configured to: If the cooking mode is water cooking and the estimated temperature and the rate of change meet the overflow condition, then the setting is reduced to the lowest level; the overflow condition includes the estimated temperature being greater than a preset second temperature threshold and less than a preset third temperature threshold, and the rate of change being less than a preset second fluctuation threshold. After the estimated temperature and the rate of change meet the overflow conditions, the change range of the estimated temperature is statistically analyzed at preset time intervals. If the change amplitude is negative and the change amplitude is greater than the preset fourth temperature threshold, then the gear level will be increased by one level.

[0108] The present invention provides an electric ceramic stove, which can be used to implement the steps in the aforementioned method embodiments.

[0109] It should be noted that the module division in the various electric ceramic cookers provided in the above embodiments is illustrative and only represents a logical functional division. In actual implementation, other division methods may also be used. Furthermore, the functional modules in the various embodiments of this invention can be integrated into a single processor, exist as separate physical entities, or be integrated into a single module. The integrated modules described above can be implemented in hardware or as software functional modules.

[0110] If the integrated module is implemented as a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the technical solution of the embodiments of the present invention can be embodied in the form of a computer program product, which is stored in a computer storage medium and includes several instructions to cause an electric ceramic cooker or processor to execute all or part of the steps of the methods in the various embodiments of the present invention. The aforementioned computer storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0111] Furthermore, the electric ceramic stove and the control method embodiment of the electric ceramic stove provided in the above embodiments belong to the same concept, and their specific implementation process can be found in the method embodiment, which will not be repeated here.

[0112] Reference Figure 6 The diagram illustrates an electric ceramic stove according to an embodiment of the present invention. Figure 6 As shown, the ceramic cooktop in this embodiment of the invention includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the control method embodiment of the ceramic cooktop described above. Alternatively, when the processor executes the computer program, it implements the functions of each module in the ceramic cooktop embodiment described above.

[0113] For example, the computer program may be divided into one or more modules, which are stored in the memory and executed by the processor to complete this application. The one or more modules may be a series of computer program instruction segments capable of performing a specific function, which can be used to describe the execution process of the computer program in the electric ceramic cooker.

[0114] The electric ceramic cooktop may include, but is not limited to, a processor and a memory. Those skilled in the art will understand that... Figure 6 This is merely one example of an electric ceramic cooktop and does not constitute a limitation on it. It may include more or fewer components than shown, or combine certain components, or different components. For example, the electric ceramic cooktop may also include input / output devices, network access devices, buses, etc.

[0115] The processor can be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor can be a microprocessor or any conventional processor.

[0116] The memory can be an internal storage unit of the ceramic cooker, such as a hard drive or RAM. Alternatively, it can be an external storage device, such as a plug-in hard drive, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, etc., installed on the ceramic cooker. Furthermore, the memory can include both internal and external storage units. The memory is used to store the computer program and other programs and data required by the ceramic cooker. The memory can also be used to temporarily store data that has been output or will be output.

[0117] This invention also discloses an electric ceramic stove, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the control method of the electric ceramic stove as described in the foregoing embodiments.

[0118] This invention also discloses a computer-readable storage medium storing a computer program that, when executed by a processor, implements the control method for the electric ceramic stove as described in the foregoing embodiments.

[0119] This invention also discloses a computer program product that, when run on a computer, causes the computer to execute the control method for the electric ceramic stove described in the foregoing embodiments.

[0120] In the specific implementation of the above embodiments, the technical features can be combined in any non-contradictory way. For the sake of brevity, not all possible combinations of the above technical features are described. However, as long as the combination of these technical features is not contradictory, it should be considered to be within the scope of this specification.

[0121] The specific embodiments described above are merely illustrative of several implementations of the present invention, and while the descriptions are detailed, they should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements all fall within the scope of protection of the present invention. Therefore, the scope of protection of this patent should be determined by the appended claims.

Claims

1. A control method for an electric ceramic stove, characterized in that, include: Determine the cooking mode and speed setting of the electric ceramic cooktop; When the electric ceramic stove heats the cookware according to the cooking mode and the setting, the heating temperature of the electric ceramic stove is detected; The heating temperature is adaptively regularized and compensated according to the cooking mode to obtain the estimated temperature of the cookware. The rate of change is determined based on the estimated temperature; The setting of the electric ceramic stove is adjusted based on the abnormal cooking events of the cookware characterized by the estimated temperature and the rate of change.

2. The method according to claim 1, characterized in that, The step of adaptively regularizing the heating temperature based on the cooking mode to obtain the estimated temperature of the cookware includes: A first compensation value is generated as a regularization term according to the cooking mode; the first compensation value is positively correlated with the calories on which the cooking mode depends; A second compensation value is generated using the control parameters in the gear position; The heating temperature is compensated using the first compensation value and the second compensation value to obtain the estimated temperature of the cookware.

3. The method according to claim 2, characterized in that, The control parameters in the gear position include the duty cycle, and the second compensation value is expressed as: duty×Δt / A; where duty is the heating time of the pot, Δt is the duty cycle, and A is a preset conversion coefficient.

4. The method according to claim 2, characterized in that, The step of compensating the heating temperature using the first compensation value and the second compensation value to obtain the estimated temperature of the cookware includes: The estimated temperature of the cookware is obtained by subtracting the first compensation value and the second compensation value from the heating temperature.

5. The method according to claim 1, characterized in that, Determining the rate of change based on the estimated temperature includes: Define the window and counter; Write the current estimated temperature to the position corresponding to the counter in the window, and increment the counter by 1; If the accumulated value of the counter is greater than or equal to the value corresponding to the maximum capacity position within the window, then the counter is reset to zero, and the estimated temperature change rate stored within the window is statistically analyzed.

6. The method according to claim 5, characterized in that, The statistical rate of change of the estimated temperature stored in the window includes: Within the window, the difference between the estimated temperature with the largest value and the estimated temperature with the smallest value is calculated to obtain the temperature amplitude. Count the total number of estimated temperatures within the window; The ratio between the temperature amplitude and the total quantity is calculated as the rate of change of the estimated temperature within the window.

7. The method according to any one of claims 1-6, characterized in that, Adjusting the setting of the electric ceramic cooktop based on abnormal cooking events of the cookware characterized by the estimated temperature and the rate of change includes: The duration for which the estimated temperature and the rate of change meet preset dry-burning conditions is statistically analyzed; the dry-burning conditions include the estimated temperature being greater than a preset first temperature threshold and the rate of change being greater than a preset first fluctuation threshold. If the duration is greater than or equal to a preset first time threshold, the level of the gear is set to 0 to stop the electric ceramic stove from heating the cookware.

8. The method according to any one of claims 1-6, characterized in that, The cooking mode includes water cooking, and adjusting the setting of the electric ceramic cooker based on abnormal cooking events of the cookware characterized by the estimated temperature and the rate of change includes: If the cooking mode is water cooking and the estimated temperature and the rate of change meet the overflow condition, then the setting is reduced to the lowest level; the overflow condition includes the estimated temperature being greater than a preset second temperature threshold and less than a preset third temperature threshold, and the rate of change being less than a preset second fluctuation threshold. After the estimated temperature and the rate of change meet the overflow conditions, the change range of the estimated temperature is statistically analyzed at preset time intervals. If the change amplitude is negative and the change amplitude is greater than the preset fourth temperature threshold, then the gear level will be increased by one level.

9. An electric ceramic stove, characterized in that, The electric ceramic stove includes a control board, a heating plate, a thermocouple, and a microcrystalline panel; the control board is equipped with a first button and a second button; the thermocouple is disposed in the heating plate, the microcrystalline panel is disposed on the heating plate, and a cookware is placed on the microcrystalline panel; The first button is used to determine the cooking mode of the electric ceramic stove; The second button is used to determine the power setting of the electric ceramic stove; The thermocouple is used to detect the heating temperature of the heating plate when the heating plate heats the cookware according to the cooking mode and setting. The control board is used to perform adaptive regularization compensation on the heating temperature according to the cooking mode to obtain the estimated temperature of the cookware. The rate of change is determined based on the estimated temperature; the setting of the electric ceramic stove is adjusted according to the abnormal cooking events of the cookware characterized by the estimated temperature and the rate of change.

10. An electric ceramic cooker, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the control method for the electric ceramic stove as described in any one of claims 1-8.

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