A method and apparatus for controlling a fire power level
By setting multiple NTC thermistors on the stove and combining temperature threshold and temperature difference judgment, accurate detection and uniform heating of the pot temperature are achieved, solving the problems of dry burning and oil fumes caused by single-point temperature measurement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- VATTI CORP LTD
- Filing Date
- 2026-04-22
- Publication Date
- 2026-07-24
AI Technical Summary
Existing stoves use a single-point temperature measurement method, which results in a large temperature difference between the center and the edge of the pot, easily causing oil fumes and dry burning. Furthermore, they cannot fully identify the temperature distribution inside the pot, leading to misjudgments.
Multiple NTC thermistors are used to detect the center and edge temperature of the cookware. Temperature values are obtained through preset time intervals. Combined with preset temperature thresholds and temperature difference judgments, the gas valve's fire level is adjusted to prevent dry burning and oil fumes, ensuring that the cookware is heated evenly.
It effectively prevents cookware from dry burning and the generation of oil fumes, and achieves accurate detection of the temperature distribution of cookware, avoiding misjudgment of local overheating.
Smart Images
Figure CN122447731A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of smart kitchen appliance technology, and in particular to a method and device for controlling the power level. Background Technology
[0002] Currently, existing cooktops use anti-dry-burning sensors for single-point temperature measurement. During cooking, there is a significant temperature difference between the edge and center of the cookware. When the center temperature is normal but the edge temperature is excessively high, it leads to the generation of cooking fumes and easily causes dry burning. Furthermore, single-point temperature measurement cannot provide a comprehensive understanding of the temperature distribution inside the cookware, making it lack the ability to identify localized overheating and prone to misjudgment. Summary of the Invention
[0003] Therefore, it is necessary to provide a method and device for controlling the firepower level to address the aforementioned technical problems.
[0004] Firstly, a method for controlling a heat level is provided. This method is applied to a cookware and a stove. The cookware includes a cookware body and a cookware support. The cookware support supports the cookware body above the stove. The cookware support is equipped with multiple edge NTC thermistors. A central NTC thermistor is provided in the central area of the burner of the stove. Each edge NTC thermistor and the central NTC thermistor are connected to the stove. The method includes: During the cooking process, the temperature values of multiple temperature measuring points of the edge NTC thermistors and the center NTC thermistor are obtained according to a preset time period. If the center temperature of the cookware body is greater than the preset dry-burning temperature threshold, the gas valve of the stove will be closed; the center temperature value is collected by the center NTC thermistor. If any edge temperature value or center temperature value exceeds the oil fume temperature threshold, the stove will adjust the gas valve to the minimum firepower level and issue a warning. If the maximum temperature value among multiple edge temperature values or center temperature values is less than the oil fume temperature threshold but greater than the target cooking temperature, the stove will adjust the gas valve to the minimum power level and issue a warning. If the maximum temperature value is less than the oil fume temperature threshold and greater than the difference between the target cooking temperature and the first temperature threshold, the stove will adjust the gas valve to the minimum power level. If the maximum temperature value is less than the difference between the target cooking temperature and the first temperature threshold, but greater than the difference between the target cooking temperature and the second temperature threshold, then the stove will adjust the gas valve to the low flame setting or the medium flame setting. If each of the temperature values is less than the difference between the target cooking temperature and the second temperature threshold, the power level of the gas valve is determined based on the maximum temperature value of the center temperature value and the edge temperature value, wherein the edge temperature value is collected by the edge NTC thermistor.
[0005] As an optional implementation, determining the firepower level of the gas valve based on the maximum temperature value of the center temperature value and the edge temperature value includes: The difference between the maximum temperature value of the center temperature value and the maximum temperature value of the edge temperature value is determined as the temperature difference; Based on the temperature difference, determine whether the cookware body is heated evenly, and adjust the heat level of the gas valve.
[0006] As an optional implementation, determining whether the cookware body is heated evenly based on the temperature difference and adjusting the heat setting of the gas valve includes: If the temperature difference is less than the first temperature difference threshold, it is determined that the cookware body is heated evenly, and the fire level of the gas valve is maintained or adjusted to a higher fire level. If the temperature difference is greater than or equal to the first temperature difference threshold and less than or equal to the second temperature difference threshold, it is determined that the cookware body is not heated evenly, and the gas valve is adjusted to the medium heat setting. If the temperature difference is greater than the second temperature difference threshold, it is determined that the cookware body is not heated evenly, and the gas valve is adjusted to a lower heat setting.
[0007] As an optional implementation, the method further includes: The cooktop receives the target cooking temperature set by the user via the control panel.
[0008] Secondly, a control device for fire level is provided. The device includes a pot and a stove. The pot includes a pot body and a pot support. The pot support is a multi-claw cast iron structure used to support the pot body above the stove. Each leg of the cookware support is equipped with an edge NTC thermistor on its inner side. The probe of the edge NTC thermistor is tilted upward at a preset angle and contacts the bottom edge of the cookware body to detect the edge temperature value of the cookware. The burner of the stove is equipped with a central NTC thermistor, which is used to detect the center temperature of the cookware body. The controller of the stove is connected to each edge NTC thermistor and the center NTC thermistor respectively. The controller acquires multiple edge temperature values and center temperature values detected by each edge NTC thermistor and the center NTC thermistor. The controller executes the firepower level control method described in any one of claims 1-4 based on the edge temperature values and the center temperature values.
[0009] As an optional implementation, the top of the probe of the edge NTC thermistor is covered with a copper contact, and a high-temperature resistant ceramic sheath is provided on the outside of the probe.
[0010] As an optional implementation, the device further includes a heat shield disposed around each edge NTC thermistor and the center NTC thermistor to isolate the direct heat radiation from the burner flame.
[0011] As an optional implementation, the device further includes an elastic clamping mechanism, one end of which is connected to each of the edge NTC thermistors, and the other end is connected to the probe of the edge NTC thermistor, for raising and lowering each of the probes so that the probes remain in contact with the cookware body. The lifting stroke of the elastic clamping mechanism is 15mm, and the spring pressure is 0.5N.
[0012] As an optional implementation, the device further includes a signal processing circuit disposed on the stove. The signal processing circuit includes a filtering module and an AD conversion module. One end of the filtering module is connected to the central NTC thermistor and each edge NTC thermistor, and the other end of the filtering module is connected to the AD conversion module. The AD conversion module is connected to the controller of the stove. The filtering module is used to receive temperature values collected by the central NTC thermistor and each edge NTC thermistor, and to filter the temperature values. The AD conversion module is used to convert the filtered temperature value into a digital signal and send the digital signal to the controller.
[0013] As an optional implementation, the stove is an embedded gas stove with a tempered glass cooktop and an STM32 microcontroller as its controller.
[0014] This application provides a method for controlling the heat level. The technical solution provided by the embodiments of this application brings at least the following beneficial effects: During cooking, the stove obtains the temperature value of the cookware body through multiple NTC thermistors. By comparing the center temperature value with a preset dry-burning temperature threshold, it determines whether the cookware is dry-burning. If it is, the stove shuts off, thereby preventing the cookware body from dry-burning and avoiding the problem of inaccurate dry-burning detection. By comparing all temperature values with the oil fume temperature threshold, it determines whether the oil temperature is too high and oil fumes are generated. If oil fumes are generated, the stove shuts off, thereby avoiding the generation of oil fumes by controlling the temperature. By comparing the temperature value with the target temperature value, the stove's heat level is adjusted, or the temperature difference of the cookware body is considered to determine whether the cookware is heated evenly, thus obtaining the temperature distribution inside the cookware. This avoids the problem of not being able to identify local overheating and incomplete temperature detection.
[0015] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description
[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, 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 the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.
[0017] Figure 1 A flowchart illustrating a method for controlling a firepower level, as provided in an embodiment of this application; Figure 2 A flowchart illustrating an example of a firepower level control method provided in this application embodiment; Figure 3 This is a schematic diagram of a firepower level control device provided in an embodiment of this application. Detailed Implementation
[0018] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.
[0019] The following will describe in detail, with reference to specific embodiments, a method for controlling the firepower level provided in this application. Figure 1 A flowchart illustrating a method for controlling a firepower level, as provided in an embodiment of this application, is shown below. Figure 1 As shown, the specific steps are as follows: Step 101: During the cooking process, the temperature values of multiple edge NTC thermistors and center NTC thermistors are obtained according to a preset time period.
[0020] In practice, existing cooktops use anti-dry-burning touch sensors for single-point temperature measurement. During cooking, there is a significant temperature difference between the edge and center of the cookware. When the center temperature is normal but the edge temperature is excessively high, it leads to the generation of oil fumes and easily causes dry burning. Furthermore, single-point temperature measurement cannot comprehensively understand the temperature distribution within the cookware, making it lack the ability to identify localized overheating and prone to misjudgment. Therefore, this application sets multiple NTC thermistors on the cookware body to collect temperature data, with each NTC thermistor connected to the cooktop. This allows for the detection of the temperature over a large area of the cookware body, preventing localized overheating during cooking. Therefore, during cooking, the temperature values of multiple edge and center NTC thermistors are acquired at preset time intervals. The preset time interval can be 100ms. The cooktop controller can use an STM32 microcontroller.
[0021] Step 102: If the center temperature of the cookware body is greater than the preset dry burning temperature threshold, the gas valve of the stove is closed; the center temperature value is collected by the center NTC thermistor.
[0022] During implementation, the stove collects temperature values from each NTC thermistor at preset time intervals. To prevent dry burning of the cookware during cooking, the temperature value of the central area of the cookware is compared with a preset dry burning temperature threshold. Because food continuously absorbs heat from the bottom of the cookware during cooking, the bottom temperature is lower than the side wall temperature. If the bottom temperature is too high, it indicates dry burning. If the center temperature of the cookware exceeds the preset dry burning temperature threshold, it indicates that the bottom temperature is too high and dry burning is occurring. In this case, the stove controls the gas valve to close and extinguish the flame. The preset dry burning temperature threshold can be above 280℃, for example, 300℃. The center temperature value is collected by a thermocouple located in the center area of the stove's burner, where a central NTC thermistor is installed.
[0023] Step 103: If any edge temperature value or center temperature value is greater than the oil fume temperature threshold, the stove will adjust the gas valve to the minimum firepower level and issue a warning.
[0024] In practice, when the center temperature of the cookware is normal but the edge temperature is too high, the cookware will still produce fumes. Therefore, after obtaining the temperature values of each NTC thermistor, it is necessary to compare all temperature values with the fume temperature threshold. If any edge temperature value or center temperature value is greater than the fume temperature threshold, it indicates that the current temperature of the cookware is too high and will produce fumes, but it is not dry-burning, so there is no need to turn off the flame. In this case, the stove will adjust the gas valve to the minimum power level and issue a warning. The fume temperature threshold can be set above 220℃, for example, 250℃.
[0025] Step 104: If the maximum temperature value among multiple edge temperature values or center temperature values is less than the oil fume temperature threshold but greater than the target cooking temperature, the stove will adjust the gas valve to the minimum power level and issue a warning.
[0026] In practice, after acquiring temperature values from multiple NTC thermistors, these edge or center temperature values can be compared with a smoke temperature threshold. If the maximum temperature value is less than the smoke temperature threshold, it indicates that the current cookware temperature will not produce smoke. Then, these edge or center temperature values can be compared with the user-set target cooking temperature. If the maximum temperature value is greater than the target cooking temperature, it indicates that the current cookware temperature exceeds the user's desired cooking temperature, and the stove's cooking power needs to be reduced. The stove will then adjust the gas valve to the minimum power level and issue a warning.
[0027] As an optional implementation, the cooktop receives the target cooking temperature set by the user via the control panel. Alternatively, the target cooking temperature can be set via the cookware; there is no limitation on this. The target cooking temperature can be 180°C.
[0028] Step 105: If the maximum temperature value is less than the oil fume temperature threshold and greater than the difference between the target cooking temperature and the first temperature threshold, the stove will adjust the gas valve to the minimum power level.
[0029] In implementation, after acquiring all temperature values collected by the NTC thermistors, each temperature value can be compared with a fume temperature threshold. If the maximum temperature value is less than the fume temperature threshold, it indicates that the current cookware temperature will not produce fumes. Then, each temperature value can be compared with the difference between the user-set target cooking temperature and a first temperature threshold. The first temperature threshold can range from 5℃ to 15℃, for example, 10℃. If the maximum temperature value is greater than the difference between the target cooking temperature and the first temperature threshold, it indicates that the current temperature of the cookware is too high, and the stove's cooking power needs to be reduced. The stove will then adjust the gas valve to the lowest power setting.
[0030] Step 106: If the maximum temperature value is less than the difference between the target cooking temperature and the first temperature threshold, but greater than the difference between the target cooking temperature and the second temperature threshold, the stove will adjust the gas valve to the medium flame setting.
[0031] In implementation, the maximum temperature value among each temperature setting can be compared with the difference between the target cooking temperature and the first temperature threshold, and the target cooking temperature and the second temperature threshold, respectively. If the maximum temperature value is less than the difference between the target cooking temperature and the first temperature threshold, but greater than the difference between the target cooking temperature and the second temperature threshold, it indicates that the current cookware temperature is lower than the target cooking temperature and needs to be further increased. In this case, the stove will adjust the gas valve to the low-heat setting (P4) or medium-heat setting. The second temperature threshold can range from 15℃ to 25℃, for example, it can be 20℃.
[0032] Step 107: If each temperature value is less than the difference between the target cooking temperature and the second temperature threshold, then the fire level of the gas valve is determined based on the maximum temperature value of the center temperature value and the edge temperature value. The edge temperature value is collected by the edge NTC thermistor.
[0033] In practice, each temperature value can be compared with the difference between the target cooking temperature and the second temperature threshold. If each temperature value is less than the difference between the target cooking temperature and the second temperature threshold, it indicates that the current pot temperature is too low, and the pot body needs to be heated. The heating level of the stove can be determined by the temperature difference of the pot body. Therefore, if each temperature value is less than the difference between the target cooking temperature and the second temperature threshold, the gas valve's heat level is determined based on the maximum temperature value between the center and the edge. A central NTC thermistor is installed in the central area of the stove's burner, and the edge temperature values are collected by edge NTC thermistors.
[0034] Specifically, the process of determining the gas valve's firing level based on the maximum temperature value of the center temperature and the edge temperature is as follows: Step 1: Determine the temperature difference as the maximum temperature difference between the center temperature and the edge temperature.
[0035] In practice, the temperature difference can be defined as the difference between the maximum temperature values of the center temperature and the edge temperature.
[0036] Step two: Based on the temperature difference, determine whether the cookware is heated evenly, and adjust the heat setting of the gas valve.
[0037] In practice, the temperature difference within the cookware body can determine whether it is heated evenly during cooking. If the heating is even, the current heat setting can be maintained or the heat setting increased. If the heating is uneven, the appropriate heat setting for the stove can be determined based on the temperature difference.
[0038] Specifically, the process of performing step two is as follows: Step A: If the temperature difference is less than the first temperature difference threshold, it is determined that the cookware body is heated evenly, and the gas valve is kept at the same power level or adjusted to a higher power level.
[0039] In practice, the temperature difference can be compared with a first temperature difference threshold. If the temperature difference is less than the first temperature difference threshold, it is determined that the cookware is heated evenly, and the gas valve's power level can be maintained. Alternatively, to quickly raise the temperature of the cookware to the target cooking temperature, it can be adjusted to a higher power level P1. The first temperature difference threshold can range from 25℃ to 35℃, for example, it can be 30℃.
[0040] Step B: If the temperature difference is greater than or equal to the first temperature difference threshold and less than or equal to the second temperature difference threshold, it is determined that the cookware body is not heated evenly, and the gas valve is adjusted to the medium heat setting.
[0041] In practice, the temperature difference is compared with a first temperature difference threshold and a second temperature difference threshold. If the temperature difference is greater than or equal to the first temperature difference threshold but less than or equal to the second temperature difference threshold, it indicates that the temperature difference within the cookware body is large, and the cookware body is judged to be unevenly heated. The second temperature difference threshold can range from 50℃ to 70℃, for example, 60℃. Therefore, when controlling the cookware's temperature rise, the heat level should not be increased too much; the gas valve can be adjusted to a medium heat level P2.
[0042] Step C: If the temperature difference is greater than the second temperature difference threshold, it is determined that the cookware body is not heated evenly, and the gas valve is adjusted to a lower heat setting.
[0043] During implementation, the temperature difference is compared with the second temperature difference threshold. If the temperature difference is greater than the second temperature difference threshold, it indicates that the temperature difference of the cookware is large and the cookware body is severely unevenly heated. Therefore, it is determined that the cookware body is unevenly heated. If the heat is increased at this time, it may aggravate the uneven heating, so the gas valve is adjusted to a lower heat setting P3.
[0044] Figure 2 A flowchart illustrating an example of a firepower level control method provided in an embodiment of this application. Figure 2As shown, after startup, the stove can also collect the temperature value T of each NTC thermistor in real time. If the center temperature value is ≥300℃, the flame will be turned off; if the center temperature value is <300℃, it will determine whether any temperature value is less than 250℃. If any temperature value is ≥250℃, the power level will be adjusted to the minimum power level and a warning will be issued; if any temperature value is less than 250℃, it will determine whether the maximum temperature value is less than the target cooking temperature. If the maximum temperature value is ≥ the target cooking temperature, the power level will be adjusted to the minimum power level and a warning will be issued; if the maximum temperature value is < the target cooking temperature, it will determine whether the maximum temperature value is less than the target temperature value -20℃. If the maximum temperature value is greater than or equal to the target temperature value -20℃, it will determine whether the maximum temperature value is greater than the target temperature value -10℃. If the maximum temperature value is greater than the target temperature value -10℃, the power level will be adjusted to P4; if the maximum temperature value is less than or equal to the target temperature value -10℃, the power level will be adjusted to the minimum power level. If the maximum temperature is less than the target temperature of -20℃, calculate the temperature difference δT. If δT ≤ K1, maintain the power level at P1. If K1 < δT ≤ K2, adjust the power level to medium at P2; if δT > K2, adjust the power level to low at P3. There are other power levels as well, which are not limited here.
[0045] This application provides a method for controlling the heat level. During cooking, the stove acquires the temperature value of the cookware body through multiple NTC thermistors. By comparing each temperature value with a preset dry-burning temperature threshold, it determines whether the cookware body is dry-burning. If the temperature is too high, the stove shuts off, thus preventing dry-burning and avoiding the problem of inaccurate dry-burning detection. The method also compares each temperature value with an oil fume temperature threshold to determine if the oil temperature is too high and oil fumes are produced. If oil fumes are produced, the stove shuts off, thus controlling the temperature to prevent oil fume production. Furthermore, by comparing the temperature value with a target temperature value, the stove's heat level is adjusted, or the temperature difference within the cookware body is used to determine whether the cookware body is heated evenly, thus obtaining the temperature distribution within the cookware body. This avoids the problem of not being able to identify localized overheating and incomplete temperature detection.
[0046] It should be understood that, although Figures 1 to 2 The steps in the flowchart are shown sequentially as indicated by the arrows, but these steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, there is no strict order in which these steps are executed, and they can be performed in other orders. Figures 1 to 2At least some of the steps in the process may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but may be executed at different times. The execution order of these steps or stages is not necessarily sequential, but may be executed in turn or alternately with other steps or at least some of the steps or stages in other steps.
[0047] It is understood that the same / similar parts between the various embodiments of the methods described above in this specification can be referred to each other. Each embodiment focuses on the differences from other embodiments, and relevant parts can be referred to the description of other method embodiments.
[0048] This application also provides a control device for the firepower level, such as... Figure 3 As shown, the device includes a cookware 310 and a stove 320. The cookware 310 includes a cookware body 311 and a cookware support 312. The cookware support 312 is a multi-claw cast iron structure used to support the cookware body 311 above the stove 320. The multi-claw cast iron structure can be a four-claw cast iron structure.
[0049] Each leg of the cookware support 311 is equipped with an edge NTC thermistor on its inner side. The probe of the edge NTC thermistor is tilted upward at a preset angle and contacts the bottom edge of the cookware body 311 to detect the edge temperature value of the cookware body 311.
[0050] The burner of the cooktop 320 is equipped with a central NTC thermistor, which is used to detect the center temperature of the cookware body 311.
[0051] The controller of the cooktop 320 is connected to each edge NTC thermistor and the center NTC thermistor respectively. The controller acquires multiple edge temperature values and center temperature values detected by each edge NTC thermistor and the center NTC thermistor.
[0052] The controller performs the above operations based on the temperature values at each edge and the center. Figure 1 The method for controlling the firepower level is shown.
[0053] As an alternative implementation, the tip of the edge NTC thermistor probe is covered with a copper contact, and a high-temperature resistant ceramic sheath is provided on the outside of the probe.
[0054] As an optional implementation, the device also includes a heat shield 330, which is disposed around each edge NTC thermistor and the center NTC thermistor to isolate the burner flame from direct heat radiation, thereby preventing direct burning by the flame.
[0055] As an optional implementation, the device also includes an elastic pressing mechanism 340, one end of which is connected to each edge NTC thermistor and the other end is connected to the probe of the edge NTC thermistor, for raising and lowering each probe so that the probe remains in contact with the cookware body 311. The lifting stroke of the elastic pressing mechanism 340 is 15mm and the spring pressure is 0.5N.
[0056] As an optional implementation, the device further includes a signal processing circuit 321, which is disposed on the cooktop 320. The signal processing circuit 321 includes a filtering module 3211 and an AD conversion module 3212. One end of the filtering module 3211 is connected to the central NTC thermistor and each edge NTC thermistor, and the other end of the filtering module 3211 is connected to the AD conversion module 3212. The AD conversion module 3212 is connected to the controller of the cooktop 320. The filtering module 3211 is used to receive the temperature values collected by the central NTC thermistor and each edge NTC thermistor, and to filter the temperature values.
[0057] The AD conversion module 3212 is used to convert the filtered temperature value into a digital signal and send the digital signal to the controller.
[0058] As an optional implementation, the cooktop 320 is an embedded gas cooktop, the cooktop surface of the cooktop 320 is tempered glass, and the controller of the cooktop 320 is an STM32 microcontroller.
[0059] This application provides a power level control device. During cooking, the stove acquires the temperature value of the cookware body through multiple NTC thermistors. By comparing each temperature value with a preset dry-burning temperature threshold, it determines whether the cookware body is dry-burning. If the temperature is too high, the stove shuts off, thus preventing dry-burning and avoiding the problem of inaccurate dry-burning detection. The stove also compares each temperature value with an oil fume temperature threshold to determine if the oil temperature is too high and oil fumes are produced. If oil fumes are produced, the stove shuts off, thus controlling the temperature to prevent oil fume production. Furthermore, by comparing the temperature values with a target temperature value, the stove's power level is adjusted, or the temperature difference within the cookware body is considered to determine whether the cookware body is heated evenly, thus obtaining the temperature distribution within the cookware body. This avoids the problem of failing to identify localized overheating and incomplete temperature detection.
[0060] Specific limitations regarding the control device for firepower levels can be found in the above description of the control method for firepower levels, and will not be repeated here. Each module in the aforementioned control device for firepower levels can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in or independent of the processor in a computer device in hardware form, or stored in the memory of a computer device in software form, so that the processor can call and execute the corresponding operations of each module.
[0061] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.
[0062] It should also be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for display, data used for analysis, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties.
[0063] The various embodiments in this specification are described in a related manner. Similar or identical parts between embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. In particular, the system embodiments are basically similar to the method embodiments, so the description is relatively simple; relevant parts can be referred to the descriptions of the method embodiments.
[0064] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.
[0065] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the invention patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.
Claims
1. A method for controlling firepower level, characterized in that, The method is applied to cookware and stoves. The cookware includes a cookware body and a cookware support. The cookware support supports the cookware body above the stove. The cookware support is equipped with multiple edge NTC thermistors. The stove's burner has a central NTC thermistor located in its central area. Each edge NTC thermistor and the central NTC thermistor are connected to the stove. The method includes: During the cooking process, the temperature values of multiple temperature measuring points of the edge NTC thermistors and the center NTC thermistor are obtained according to a preset time period. If the center temperature of the cookware body is greater than the preset dry-burning temperature threshold, the gas valve of the stove will be closed; the center temperature value is collected by the center NTC thermistor. If any edge temperature value or center temperature value exceeds the oil fume temperature threshold, the stove will adjust the gas valve to the minimum firepower level and issue a warning. If the maximum temperature value among multiple edge temperature values or center temperature values is less than the oil fume temperature threshold but greater than the target cooking temperature, the stove will adjust the gas valve to the minimum power level and issue a warning. If the maximum temperature value is less than the oil fume temperature threshold and greater than the difference between the target cooking temperature and the first temperature threshold, the stove will adjust the gas valve to the minimum power level. If the maximum temperature value is less than the difference between the target cooking temperature and the first temperature threshold, but greater than the difference between the target cooking temperature and the second temperature threshold, then the stove will adjust the gas valve to the low flame setting or the medium flame setting. If each of the temperature values is less than the difference between the target cooking temperature and the second temperature threshold, the power level of the gas valve is determined based on the maximum temperature value of the center temperature value and the edge temperature value, wherein the edge temperature value is collected by the edge NTC thermistor.
2. The method according to claim 1, characterized in that, Determining the firepower level of the gas valve based on the maximum temperature value of the center temperature value and the edge temperature value includes: The difference between the maximum temperature value of the center temperature value and the maximum temperature value of the edge temperature value is determined as the temperature difference; Based on the temperature difference, determine whether the cookware body is heated evenly, and adjust the heat level of the gas valve.
3. The method according to claim 2, characterized in that, The step of determining whether the cookware body is heated evenly based on the temperature difference and adjusting the heat level of the gas valve includes: If the temperature difference is less than the first temperature difference threshold, it is determined that the cookware body is heated evenly, and the fire level of the gas valve is maintained or adjusted to a higher fire level. If the temperature difference is greater than or equal to the first temperature difference threshold and less than or equal to the second temperature difference threshold, it is determined that the cookware body is not heated evenly, and the gas valve is adjusted to the medium heat setting. If the temperature difference is greater than the second temperature difference threshold, it is determined that the cookware body is not heated evenly, and the gas valve is adjusted to a lower heat setting.
4. The method according to claim 1, characterized in that, The method further includes: The cooktop receives the target cooking temperature set by the user via the control panel.
5. A control device for firepower level, characterized in that, The device includes a cookware and a stove. The cookware includes a cookware body and a cookware support. The cookware support is a multi-claw cast iron structure used to support the cookware body above the stove. Each leg of the cookware support is equipped with an edge NTC thermistor on its inner side. The probe of the edge NTC thermistor is tilted upward at a preset angle and contacts the bottom edge of the cookware body to detect the edge temperature value of the cookware. The burner of the stove is equipped with a central NTC thermistor, which is used to detect the center temperature of the cookware body. The controller of the stove is connected to each edge NTC thermistor and the center NTC thermistor respectively. The controller acquires multiple edge temperature values and center temperature values detected by each edge NTC thermistor and the center NTC thermistor. The controller executes the firepower level control method described in any one of claims 1-4 based on the edge temperature values and the center temperature values.
6. The apparatus according to claim 5, characterized in that, The top of the probe of the edge NTC thermistor is covered with a copper contact, and the probe is fitted with a high-temperature resistant ceramic sheath.
7. The apparatus according to claim 5, characterized in that, The device also includes a heat shield, which is disposed around each edge NTC thermistor and the center NTC thermistor to isolate the direct heat radiation of the burner flame.
8. The apparatus according to claim 5, characterized in that, The device also includes an elastic pressing mechanism, one end of which is connected to each of the edge NTC thermistors, and the other end is connected to the probe of the edge NTC thermistor. The elastic pressing mechanism is used to raise and lower each of the probes so that the probes remain in contact with the cookware body. The lifting stroke of the elastic pressing mechanism is 15mm and the spring pressure is 0.5N.
9. The apparatus according to claim 5, characterized in that, The device further includes a signal processing circuit, which is disposed on the stove. The signal processing circuit includes a filtering module and an AD conversion module. One end of the filtering module is connected to the central NTC thermistor and each edge NTC thermistor, and the other end of the filtering module is connected to the AD conversion module. The AD conversion module is connected to the controller of the stove. The filtering module is used to receive temperature values collected by the central NTC thermistor and each edge NTC thermistor, and to filter the temperature values. The AD conversion module is used to convert the filtered temperature value into a digital signal and send the digital signal to the controller.
10. The apparatus according to claim 5, characterized in that, The stove is a built-in gas stove with a tempered glass cooktop and an STM32 microcontroller as its controller.