Control method and control device for preventing dry burning of stove, and stove

Abstract

The present application relates to the field of smart home appliance technology and discloses a control method for preventing dry burning of a stove. The stove is provided with a temperature detection device and a capacitance detection device. The control method comprises: detecting the temperature information of the pot; when the temperature information of the pot meets a first condition, obtaining the capacitance value detected by the capacitance detection device; and executing the dry burning prevention operation corresponding to the temperature information or capacitance value based on the capacitance value. By performing capacitance detection on pots that meet the temperature change conditions, accurate material judgment is achieved, so that pots of different materials can be accurately prevented from dry burning, effectively reducing the false positive rate of dry burning prevention. The present application also discloses a control device and stove for preventing dry burning of a stove.

Description

Technical Field

[0001] The present application relates to the technical field of smart home appliances, for example, to a control method and control device for preventing dry burning of a stove, and a stove. Background Art

[0002] Dry-boiling refers to the prolonged heating of an empty pot, which can dry out or burn the contents. It's a common kitchen safety hazard, causing discoloration and deformation, and in severe cases, fire. Currently, dry-boiling protection is common in household stoves. This feature automatically shuts off the stove when the pot reaches a set threshold, providing protection against dry-boiling and protecting the pot.

[0003] During the implementation of the embodiments of the present disclosure, it was found that at least the following problems exist in the related art:

[0004] Related technologies detect the temperature changes of the cookware and then determine the cookware material to implement a dry-boil prevention strategy tailored to the cookware material. However, for some cookware, such as non-metallic cookware with similar temperature fluctuations to metal cookware, dry-boil prevention based solely on temperature changes can lead to premature misjudgment when the cookware is not actually dry-boiled, limiting its effectiveness. Summary of the Invention

[0005] The embodiments of the present disclosure provide a cooker, a method and a device for preventing dry burning thereof, so as to solve the technical problems in the related art of large errors and limited dry burning prevention effect when the cooker is prevented from dry burning only by temperature information.

[0006] In some embodiments, the stove is provided with a temperature detection device and a capacitance detection device, and the control method for preventing dry burning of the stove includes: detecting the temperature information of the pot; when the temperature information of the pot meets a first condition, obtaining the capacitance value detected by the capacitance detection device; and executing the anti-dry burning operation corresponding to the temperature information or the capacitance value according to the capacitance value.

[0007] In some embodiments, the control device for preventing dry burning of a stove includes a processor and a memory storing program instructions, and the processor is configured to execute the above-mentioned control method for preventing dry burning of a stove when executing the program instructions.

[0008] In some embodiments, the stove includes the above-mentioned control device for preventing dry burning of the stove.

[0009] The control method and control device for preventing dry burning of a stove, and the stove provided by the embodiments of the present disclosure can achieve the following technical effects:

[0010] The cookware's material is initially determined by detecting its temperature. If the cookware's temperature change matches the temperature-dependent properties of metal, the cookware's material is re-determined based on the change in its capacitance. This change in capacitance determines the corresponding dry-boil prevention strategy. When the cookware's temperature exceeds the dry-boil prevention temperature, the cooktop stops heating to prevent dry-boil issues. By performing capacitance detection on cookware that meets the temperature change criteria, accurate material judgment is achieved, enabling precise dry-boil prevention for cookware of different materials, effectively reducing the false positive rate for dry-boil prevention.

[0011] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] One or more embodiments are exemplarily described by corresponding drawings. These exemplary descriptions and drawings do not limit the embodiments. Elements with the same reference numerals in the drawings are considered similar elements. The drawings do not constitute a scale limitation. In addition,

[0013] Figure 1 is a schematic diagram of a cooker provided in an embodiment of the present disclosure;

[0014] Figure 2 is a schematic diagram of a control method for preventing dry burning of a stove provided by an embodiment of the present disclosure;

[0015] Figure 3 is a schematic diagram of a control method for preventing dry burning of a stove provided by an embodiment of the present disclosure;

[0016] Figure 4 is a structural diagram of an oscillation circuit provided by an embodiment of the present disclosure;

[0017] Figure 5 Schematic diagram of a control device for preventing dry burning of a stove provided in an embodiment of the present disclosure. DETAILED DESCRIPTION

[0018] In order to be able to understand the features and technical content of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The accompanying drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the sake of convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0019] In the description and claims of the embodiments of the present disclosure, as well as in the accompanying drawings, the terms "first," "second," and the like are used to distinguish similar items and are not necessarily used to describe a particular order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate to describe the embodiments of the present disclosure herein. In addition, the terms "including," "having," and any variations thereof are intended to cover non-exclusive inclusions.

[0020] Unless otherwise stated, the term "plurality" means two or more.

[0021] In the embodiment of the present disclosure, the character " / " indicates that the preceding and following objects are in an "or" relationship. For example, A / B means: A or B.

[0022] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0023] Figure 1 This is a schematic diagram of the structure of a stove provided by an embodiment of the present disclosure. Figure 1 As shown, the cooker includes a contact portion 1, a temperature detection device 2, and a capacitance detection device 3. The contact portion 1 is used to support and contact the pot placed on the cooker, the temperature detection device 2 is used to detect the temperature of the pot placed on the contact portion 1 during the cooking process, and the capacitance detection device 3 contacts the pot placed on the contact portion 1 to detect the capacitance value.

[0024] The contact portion 1 can be a component in the stove structure that contacts the pot, such as a burner, a fire cover, etc., or it can be a component detachably connected to the stove, such as a stove rack, a pot rack, a pot rack support, etc.

[0025] The temperature detection device 2 can be a device that can detect temperature, such as a temperature sensor, a negative temperature coefficient (NTC) thermistor, or a temperature probe. It is installed on the contact portion 1 through a connector to detect the temperature of the pot placed on the contact portion 1. Generally, when a stove is used to heat a pot, the temperature information of the pot may include the temperature of the bottom of the pot, its heating rate based on the relationship between temperature and time, and the rate of change of the heating rate. Based on the temperature information of the pot, information such as the cooking status and cooking stage of the pot can be obtained, which can be used to provide an anti-dry-burn warning. Optionally, the number of temperature detection devices 2 is one or more.

[0026] The capacitance detection device 3 can be a capacitance detector, a capacitance sensor, etc., and is mounted on the contact portion 1 via a connector to measure capacitance changes during contact between the cookware and the contact portion 1 .

[0027] Optionally, the capacitance detection device 3 includes an electrode plate and a capacitance detection circuit. The electrode plate includes an upper electrode plate and a lower electrode plate, the upper electrode plate being in contact with the cookware; and the capacitance detection circuit is configured to detect the capacitance value of a capacitor formed by the upper and lower electrode plates and / or the capacitance value of a capacitor formed by the lower electrode plate and the cookware.

[0028] Here, the upper electrode plate and the lower electrode plate are arranged in parallel to form a parallel plate capacitor. The capacitance value of the parallel plate capacitor is obtained as follows:

[0029]

[0030] Where C is the capacitance of the parallel plate capacitor, ε is the dielectric constant (relative permittivity), k is the electrostatic force constant, S is the area of the two plates facing each other, and d is the vertical distance between the two plates.

[0031] According to formula (1), when the vertical distance d between the two plates is constant, the capacitance C of the parallel plate capacitor is positively correlated with the area S facing the two plates. Specifically, in this embodiment, when the pot is not placed on the contact portion 1, the capacitor is formed by the upper electrode plate and the lower electrode plate, which are parallel to each other, and the area of the original upper electrode plate is smaller than that of the lower electrode plate. When the pot is placed on the contact portion 1, the upper electrode plate contacts the pot. In the case where the pot is made of metal, the pot and the original upper electrode plate together form the upper electrode plate of the capacitor. Since the projected area of the pot on the lower electrode plate increases, the area facing the upper electrode plate and the lower electrode plate increases. According to formula (1), the capacitance value changes. In the case where the pot is made of non-metallic material, since the pot and the upper electrode plate do not form a path after contact, the capacitance value does not change.

[0032] Figure 2 This is a flow chart of a control method for preventing dry burning of a stove provided by an embodiment of the present disclosure. The control method for preventing dry burning of a stove is applied to Figure 1 The cooktop shown, combined with Figure 2 As shown, the control method for preventing dry burning of a stove includes:

[0033] Step S01: detecting the temperature information of the cookware.

[0034] Generally, when a cooker is used to heat a pot, the pot's temperature information may include the pot bottom temperature, its rate of temperature increase based on the relationship between temperature and time, and the rate of change of the temperature increase rate. The temperature parameter can be obtained by a temperature detection device located on the cooktop or pot bottom, while the time parameter can be obtained by a timer located on the cooker or pot. In this embodiment, the pot's temperature information is obtained by a temperature detection device located on the contact portion.

[0035] Step S02: When the temperature information of the cookware satisfies a first condition, obtaining a capacitance value detected by a capacitance detection device.

[0036] Here, the first condition represents a control condition related to the cookware's heating rate. When the cookware's temperature information meets the control condition, the system determines that the cookware is likely metal. For cookware that meets the temperature profile of a metal material, the system then performs a material verification step to set a boil-dry prevention threshold appropriate for the cookware's material, preventing boil-dry problems. Because some non-metallic cookware has a faster heating rate, capacitance testing is performed on these cookware that meet the temperature profile of a metal material to accurately determine the cookware's material and reduce false positives for boil-dry prevention.

[0037] Step S03: executing an anti-dry-burning operation corresponding to the temperature information or the capacitance value according to the capacitance value.

[0038] Because the electrode plates that make up a capacitor need to store and release charge during operation, they must be conductive. When the cookware is made of metal, the cookware and the original upper electrode plate together form the upper electrode plate of the capacitor, and the capacitance value of the capacitor formed by the cookware and the electrode plate is greater than that formed by the original upper and lower electrode plates. When the cookware is made of non-metallic material, the cookware does not meet the conductive conditions of the electrode plate, so it does not form a capacitor together with the electrode plate, nor does it change the capacitance value of the capacitor. Therefore, based on the change in capacitance value, the material of the cookware that meets the temperature change conditions of metal materials can be further judged to determine whether the cookware is made of metal or non-metallic material.

[0039] The control method for preventing dry-burning in stoves provided by the disclosed embodiments detects the temperature of the pot to initially determine the pot material. If the pot's temperature change matches the temperature-dependent properties of metal, a secondary determination of the pot material is made based on the pot's capacitance change. A corresponding dry-burning prevention strategy is determined based on the capacitance change. When the pot's temperature exceeds the dry-burning prevention temperature, the stove is controlled to stop heating to prevent dry-burning. By performing capacitance detection on pots that meet the temperature change conditions, accurate material judgment is achieved, enabling precise dry-burn prevention for pots of different materials, effectively reducing the false positive rate for dry-burning prevention.

[0040] Optionally, the first condition includes that the heating rate of the cookware is greater than a first set rate; or the heating rate of the cookware is less than a second set rate, and the rate of change of the heating rate is less than 0.

[0041] Here, the material of the cookware can be preliminarily determined based on the heating rate in the cookware temperature information. Cookware of different materials has different heating rates due to different heat transfer rates. Therefore, the heating rate corresponds to the material of the cookware, and the threshold for preventing dry burning can be determined accordingly. Here, the heating rate of the cookware is determined based on the heating range and heating time of the cookware. For example, if the first heating range [T1, T2] is detected and obtained within the first measurement period t1, then the heating rate k1 = (T2-T1) / t1; or if the time t2 required for the cookware temperature to rise from T2 to T3 is detected, then the heating rate k2 = (T3-T2) / t2. The rate of change of the heating rate is obtained by the second-order derivative of temperature with respect to time, for example, a0 = (k2-k1) / t2, where a0 is the rate of change of the heating rate between T2 and T3.

[0042] Here, the set rate is used to represent a preset heating rate related to the material of the cookware. Generally, the heating rate of metal cookware is faster than that of non-metallic cookware.

[0043] When the heating rate of the cookware is greater than the first set rate, it indicates that the cookware maintains a relatively high heating rate, which is consistent with the temperature rise of a metal cookware. The cookware material corresponding to this state may be a metal cookware.

[0044] Furthermore, if the cookware's heating rate is greater than a first set rate and the rate of change of the heating rate is greater than or equal to 0, the cookware is metal. Here, the first set rate represents the heating rate of a cookware of a certain material during normal cooking at a corresponding heat level. If the rate of change of the cookware's heating rate is greater than or equal to 0, it indicates that the cookware is maintaining a relatively high heating rate and is gradually increasing its heating rate over time, or maintaining a constant heating rate. In this state, the cookware is metal.

[0045] When the heating rate of the cookware is less than the second set rate and the rate of change of the heating rate is less than 0, it means that the heating speed of the cookware is slow and the rate of change is low, which is consistent with the temperature rise of metal cookware. The cookware material corresponding to this state may be metal cookware.

[0046] The second set rate is used to indicate the critical value of the heating rate of the cookware when the heating rate of the cookware is slow. Optionally, the second set rate is 0.8-1.2, and here the second set rate is 1. Under this condition, the rate of change of the heating rate of the cookware is less than 0. Optionally, the rate of change of the heating rate is negative, close to 0, and has little fluctuation, indicating that the heating rate of the cookware is getting slower and slower. In this case, it can be determined that the material of the cookware is metal.

[0047] Optionally, the value of the first set rate is determined according to the cooking firepower of the cooker. The higher the cooking firepower of the cooker, the larger the value of the corresponding first set rate. Since there is a corresponding relationship between the first set rate and the firepower level, which represents the heating rate of a certain type of cookware in the normal cooking state under the corresponding firepower level, the value of the first set rate increases as the firepower level increases. Here, the firepower level can be obtained by a firepower detection sensor. The firepower detection sensor can be a rotatable potentiometer installed on the cooking switch knob column, and the firepower adjustment gear of the cooker can be obtained by sensing the change of the resistance, voltage or current of the potentiometer, and then the size of the cooking firepower can be further judged. In another embodiment, the firepower detection sensor can also be a gas flow rate sensing device installed on the gas pipeline, and the size of the cooking firepower can be judged by sensing the flow rate of the gas. In yet another embodiment, the firepower detection sensor can be a gas pressure sensing device installed on the gas pipeline, and the size of the cooking firepower can be judged by sensing the pressure of the gas. Of course, the cooker can also be an induction cooker. At this time, the firepower of the induction cooker can be judged by detecting the magnitude of the current or the firepower gear supplied to the coil; the firepower can be divided into multiple gears, such as gears 1, 2, 3, 4, and 5. In one embodiment, the firepower is divided into 3 gears, gear 1 is low fire, gear 2 is medium fire, and gear 3 is high fire. The first preset firepower is P1 and the second preset firepower is P2. For example, when the detected firepower P < P1, it is judged that the current firepower level is low fire; when the detected firepower P1 ≤ P ≤ P2, it is judged that the current firepower level is medium fire; when the detected firepower P > P2, it is judged that the current firepower level is high fire. The corresponding value of the first set rate can be confirmed according to the current firepower level, which is used to judge the temperature rise situation of the cookware.

[0048] In the embodiments of the present disclosure, the current firepower level is represented by the opening degree of the gas valve. The larger the numerical value of the opening degree of the gas valve, the smaller the current valve opening degree and the smaller the gas flow rate. Therefore, when the opening degree value of the gas valve is larger, the current firepower level is lower; when the opening degree value of the gas valve is smaller, the current firepower level is higher. In this case, the value of the first heating rate corresponding to the current firepower can be determined according to the corresponding relationship between the firepower and the first heating rate. Here, there is a proportional linear change relationship between the first heating rate and the firepower. The higher the firepower of the cooker, the larger the value of the corresponding first heating rate.

[0049] Optionally, when the temperature of the cookware is within the first temperature range, the temperature information of the cookware is obtained. Here, the first temperature range is determined according to the cooking firepower of the cooker. Within this first temperature range, the cookware is in a high-temperature state and can maintain a good use state. Optionally, the lower limit value of the first temperature range is B min , and the upper limit value of the first temperature range is B max . The lower limit value B min and the upper limit value Bmax The time interval is determined based on the stove's power and is positively correlated with the stove's power. When the pot bottom temperature is within this first temperature range, the pot has already begun heating and cooking, and there's no danger of a dry boil. At this point, the anti-dry boil feature is activated, and temperature information is acquired. Compared to continuously monitoring the pot temperature over time, this approach can shorten data acquisition time, reduce redundant data, and reduce the storage space required. Optionally, after cooking begins, the pot temperature can be periodically monitored at set intervals to determine whether to activate the anti-dry boil feature and acquire the pot's temperature change.

[0050] Optionally, after the temperature change value is obtained, when the pot temperature is lower than the lower limit value B of the first temperature range, min In the case of the most recent temperature value, the lower limit value B of the first temperature interval is updated according to the most recently collected temperature value. min At the same time, considering that the reason for the temperature drop may be that new ingredients are added during the cooking process, such as water, vegetables, etc., when the base temperature is less than the lower limit value B of the first temperature range, min When the temperature is collected, all collected data will be cleared and temperature collection will be restarted.

[0051] Optionally, according to the capacitance value, an anti-dry-burn operation corresponding to the temperature information or the capacitance value is performed, including: when the capacitance difference between the capacitance value and the initial capacitance value is greater than or equal to a preset capacitance difference, performing an anti-dry-burn operation corresponding to the temperature information; when the capacitance difference between the capacitance value and the initial capacitance value is less than a preset capacitance difference, performing an anti-dry-burn operation corresponding to the capacitance value.

[0052] Here, those skilled in the art can determine the preset capacitance difference based on previous experimental data so that the preset capacitance difference can accurately reflect the change in capacitance value brought about by the metal cookware based on the initial capacitance value, thereby making the judgment result of the cookware material more accurate.

[0053] Because the electrode plates that make up a capacitor need to store and release charge during operation, they must be conductive. When the cookware is made of metal, the cookware and the original upper electrode plate together form the upper electrode plate of the capacitor, and the capacitance value of the capacitor formed by the cookware and the electrode plate is greater than that formed by the original upper and lower electrode plates. When the cookware is made of non-metallic materials, the cookware does not meet the conductive conditions of the electrode plate and therefore does not form a capacitor together with the electrode plate, nor does it change the capacitance value. Therefore, the change in capacitance value can be used to determine whether the cookware is made of metal or non-metallic material.

[0054] When the capacitance difference is greater than or equal to the preset capacitance difference, it indicates that the cookware and the original upper electrode plate together constitute the upper electrode plate of the capacitor, and relative to the capacitance formed by the original upper electrode plate and the lower electrode plate, the capacitance value of the capacitor formed by the cookware and the electrode plate is significantly increased. Therefore, it is determined that the material of the cookware is metal, which is consistent with the material of the cookware reflected by the temperature information. At this time, the anti-dry-burning operation corresponding to the temperature information is executed, that is, the anti-dry-burning operation corresponding to the metal cookware is executed.

[0055] When the capacitance difference is less than the preset capacitance difference, it indicates that the cookware does not meet the conductive conditions of the electrode plate, and therefore does not form a capacitor together with the electrode plate, nor does it significantly change the capacitance value of the capacitor. Therefore, it is determined that the material of the cookware is non-metallic, which is different from the material of the cookware reflected by the temperature information. At this time, the anti-dry-burning operation corresponding to the capacitance value is executed, that is, the anti-dry-burning operation corresponding to the non-metallic cookware is executed.

[0056] Compared with judging the material of the pot based on conductivity or temperature change curves, judging the material based on changes in capacitance values is more accurate. It can avoid material misjudgment caused by long-term use or the thickness or special properties of the pot, which may lead to misjudgment when executing the anti-dry burning strategy.

[0057] Optionally, executing the anti-dry-burning operation corresponding to the temperature information or capacitance value includes: executing the anti-dry-burning operation corresponding to the temperature information, reducing the firepower when the temperature at the bottom of the pot is greater than or equal to a first setting value; or executing the anti-dry-burning operation corresponding to the capacitance value, reducing the firepower when the temperature at the bottom of the pot is greater than or equal to a second setting value; wherein the first setting value is higher than the second setting value.

[0058] The bottom temperature of the cookware and the anti-dry-burn temperature corresponding to the material of the cookware are obtained. When the anti-dry-burn operation corresponding to the temperature information is executed, the material of the cookware is metal, and the anti-dry-burn temperature is a first set value; when the anti-dry-burn operation corresponding to the capacitance value is executed, the material of the cookware is non-metallic, and the anti-dry-burn temperature is a second set value.

[0059] Here, the first set value represents the maximum temperature threshold within which metal cookware can maintain optimal performance during cooking; the second set value represents the maximum temperature threshold within which non-metallic cookware can maintain optimal performance during cooking. The first set value is higher than the second set value. Thus, by setting the anti-dry-boil temperature based on the cookware material, the cooktop is controlled to stop heating when the bottom temperature of the pot exceeds the anti-dry-boil temperature, thus preventing dry-boil.

[0060] Optionally, the above-mentioned control method for preventing dry burning of a stove further includes: controlling the stove to stop heating when the temperature of the pot reaches a third set value. The third set value is used to express the temperature at which some or all materials of the pot are at risk of dry burning. When the pot reaches this temperature, continuing to heat it may cause the pot to dry burn or even explode. Optionally, the third set value is greater than the above-mentioned second set value; optionally, the third set value is assigned a value of 500 degrees. When the temperature of the pot is greater than 500 degrees, the stove is controlled to stop heating, which can prevent the pot from dry burning. In this way, when the anti-dry burning temperature cannot be set according to the material of the pot, anti-dry burning protection for the pot is achieved by setting the third set value.

[0061] The control method for preventing dry-burning in stoves, provided by the disclosed embodiments, detects the temperature of the cookware to initially determine its material. If the temperature variation of the cookware matches the temperature-dependent properties of metal, a secondary determination of the cookware's material is made based on the change in the cookware's capacitance value. This change in capacitance determines the corresponding dry-burning prevention strategy. By performing capacitance detection on cookware that meets the temperature variation criteria, accurate material determination is achieved, enabling precise dry-burning prevention for cookware of different materials, effectively reducing the false positive rate for dry-burning prevention.

[0062] like Figure 3 As shown, the embodiment of the present disclosure provides a control method for preventing dry burning of a stove, comprising:

[0063] Step S11, detecting the temperature information of the cookware.

[0064] Step S12: When the temperature information of the cookware satisfies the first condition, the oscillation frequency of the oscillation circuit in which the capacitor is located is obtained; when the temperature information of the cookware does not satisfy the first condition, an anti-dry-boiling operation corresponding to the temperature information is performed.

[0065] Here, the first condition is used to represent the temperature information that meets the temperature rise conditions of metal cookware; if the temperature information of the cookware does not meet the first condition, the cookware is determined to be made of non-metallic material, and the anti-dry-burning operation corresponding to the non-metallic material is performed.

[0066] For some non-metallic cookware, such as glass pots, the heating rate is consistent with that of metal cookware, but the anti-dry-burning strategy for non-metallic materials needs to be implemented. Therefore, it is necessary to test the capacitance value of such cookware whose temperature information meets the first condition to further determine the material of the cookware and avoid misjudgment that may cause dry-burning damage to the cookware.

[0067] An oscillator circuit is a circuit that automatically converts direct current (DC) power into an alternating current (AC) signal with a certain amplitude and frequency without the need for an external signal. The oscillator circuit includes an amplifier, a positive feedback circuit, and a frequency-selective network. The amplifier amplifies the input signal applied to the oscillator circuit's output terminal to maintain a constant value; the positive feedback circuit ensures that the feedback signal provided to the oscillator circuit's input terminal is phase-matched; and the frequency-selective network only allows a specific frequency, f0, to pass through, allowing the oscillator circuit to produce a single-frequency output. The disclosed embodiment obtains the oscillation frequency of the oscillator circuit and indirectly calculates the capacitance value of the capacitor, resulting in a simpler and more flexible acquisition method.

[0068] Optionally, obtaining the oscillation frequency of the oscillation circuit in which the capacitor is located includes: obtaining multiple oscillation frequencies detected within a preset time period; performing data processing on the multiple oscillation frequencies to obtain a processed oscillation frequency; and using the processed oscillation frequency as the oscillation frequency. The preset time period is a preset period before the current moment (for example, the previous 3 minutes). When there are other objects on the electrode plate, the oscillation frequency of the oscillation circuit will be affected (for example, food debris falls on the lower electrode plate). In order to reduce the impact of accidental events on the collected oscillation frequency, multiple oscillation frequencies are collected within a preset time period, and data processing is performed on the multiple oscillation frequencies to obtain a final oscillation frequency, thereby reducing the randomness of the oscillation frequency change and improving the accuracy of the oscillation frequency.

[0069] Optionally, performing data processing on the plurality of oscillation frequencies to obtain a processed oscillation frequency includes:

[0070]

[0071] in, is the processed oscillation frequency, n is the number of oscillation frequencies detected within the preset time period, f n is the nth oscillation frequency detected within the preset time period, α n f n The weighting coefficient of α1+…+α n =1.

[0072] In this way, a weighted average processing is performed on multiple oscillation frequencies detected within a preset time period to obtain a weighted average oscillation frequency (processed oscillation frequency), and the weighted average oscillation frequency is used as the final oscillation frequency of the oscillation circuit, which can reduce the influence of accidental factors and improve the accuracy of the oscillation frequency acquisition method of the oscillation circuit.

[0073] Optionally, α n It is positively correlated with n, that is, as the value of n increases, α nFor example, when n=5, α1=0.1, α2=0.15, α3=0.2, α4=0.25, and α5=0.3.

[0074] α n is the nth oscillation frequency f detected within the preset time period n The weighting coefficient, α n Positively correlated with n, indicating that f n The closer the detection time is to the current time, the larger the weighting coefficient is. In this way, the weighted average oscillation frequency can better represent the oscillation frequency of the oscillation circuit at the current time.

[0075] Optionally, performing data processing on the multiple oscillation frequencies to obtain a processed oscillation frequency includes: obtaining an average oscillation frequency of the multiple oscillation frequencies; calculating an oscillation frequency difference between the multiple oscillation frequencies and the average oscillation frequency; and selecting the oscillation frequency with the smallest oscillation frequency difference among the multiple oscillation frequencies as the processed oscillation frequency. This can reduce the influence of accidental factors and improve the accuracy of the oscillation frequency acquisition method of the oscillation circuit.

[0076] Step S13: Calculate the capacitance value according to the oscillation frequency.

[0077] In the embodiment of the present disclosure, an LC oscillation circuit is used to obtain the oscillation frequency, that is, the frequency selection network of the oscillation circuit is composed of an inductor L and a capacitor C. Figure 4 As shown, the oscillation circuit includes a peripheral drive circuit (including an amplifier and a positive feedback circuit), an inductor L, a capacitor C and an electrode plate S0 connected in sequence, wherein: the inductor L and the capacitor C are respectively connected in parallel with the peripheral drive circuit; one end of the electrode plate S0 is connected to the peripheral drive circuit, and the other end is grounded.

[0078] Optionally, the capacitance value is calculated based on the oscillation frequency, including:

[0079]

[0080] Among them, C0 is the capacitance value of the capacitor formed by the cookware and the electrode plate, L is the inductance value of the inductor L in the oscillation circuit, and f is the oscillation frequency.

[0081] The LC oscillator circuit has a wide oscillation frequency range and is easy to start oscillating. As the capacitance value of the capacitor formed by the cookware and the electrode plate changes, the oscillation frequency f will also change significantly, making the detection result more accurate. In turn, the capacitance value calculated by the oscillation frequency according to Formula 3 is more accurate. The cookware material is determined based on the capacitance value, and the anti-dry-burning operation corresponding to the cookware material is performed.

[0082] Step S14 , performing an anti-dry-burning operation corresponding to the temperature information or the capacitance value according to the capacitance difference between the capacitance value and the initial capacitance value.

[0083] When the capacitance difference between the capacitance value and the initial capacitance value is greater than or equal to the preset capacitance difference, the anti-dry burning operation corresponding to the temperature information is performed; when the capacitance difference between the capacitance value and the initial capacitance value is less than the preset capacitance difference, the anti-dry burning operation corresponding to the capacitance value is performed.

[0084] Step S15, execute the anti-dry burning operation corresponding to the temperature information, and reduce the firepower when the bottom temperature of the pot is greater than or equal to the first set value; or execute the anti-dry burning operation corresponding to the capacitance value, and reduce the firepower when the bottom temperature of the pot is greater than or equal to the second set value; wherein the first set value is higher than the second set value.

[0085] The control method for preventing dry-burning in stoves, provided by the disclosed embodiments, detects the temperature of the cookware to initially determine its material. If the temperature variation of the cookware matches the temperature-dependent properties of metal, a secondary determination of the cookware's material is made based on the change in the cookware's capacitance value. This change in capacitance determines the corresponding dry-burning prevention strategy. By performing capacitance detection on cookware that meets the temperature variation criteria, accurate material determination is achieved, enabling precise dry-burning prevention for cookware of different materials, effectively reducing the false positive rate for dry-burning prevention.

[0086] Combine Figure 5 As shown, an embodiment of the present disclosure provides a control device for preventing dry burning of a stove, comprising a processor 100 and a memory 101. Optionally, the device may further comprise a communication interface 102 and a bus 103. The processor 100, the communication interface 102, and the memory 101 may communicate with each other via the bus 103. The communication interface 102 may be used for information transmission. The processor 100 may call the logic instructions in the memory 101 to execute the control method for preventing dry burning of a stove according to the above embodiment.

[0087] In addition, the logic instructions in the memory 101 can be implemented in the form of software functional units and can be stored in a computer-readable storage medium when sold or used as an independent product.

[0088] Memory 101, as a computer-readable storage medium, can be used to store software programs and computer-executable programs, such as the program instructions / modules corresponding to the methods in the embodiments of the present disclosure. Processor 100 executes the program instructions / modules stored in memory 101 to execute functional applications and process data, thereby implementing the control method for preventing dry cooking in the cooktop described in the above-mentioned embodiments.

[0089] The memory 101 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for a function; the data storage area may store data generated based on the use of the terminal device. Furthermore, the memory 101 may include high-speed random access memory and non-volatile memory.

[0090] The disclosed embodiments provide a stove comprising the aforementioned control device for preventing dry burning. Optionally, the stove may be an induction cooker or a gas stove. By providing the control device for preventing dry burning, the stove can be controlled to prevent the pot from dry burning by determining a dry burning prevention strategy based on the temperature information and capacitance value of the pot placed on the stove for cooking. This effectively improves the safety of the stove and reduces the false positive rate of dry burning prevention.

[0091] An embodiment of the present disclosure provides a computer-readable storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to execute the above-mentioned control method for preventing dry burning of a stove.

[0092] An embodiment of the present disclosure provides a computer program product, which includes a computer program stored on a computer-readable storage medium. The computer program includes program instructions. When the program instructions are executed by a computer, the computer executes the above-mentioned control method for preventing dry burning of a stove.

[0093] The aforementioned computer-readable storage medium may be a transient computer-readable storage medium or a non-transitory computer-readable storage medium.

[0094] The technical solution of the embodiments of the present disclosure may be embodied in the form of a software product, which is stored in a storage medium and includes one or more instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method of the embodiments of the present disclosure. The aforementioned storage medium may be a non-transitory storage medium, including: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program code, or a transient storage medium.

[0095] The above description and the accompanying drawings fully illustrate the embodiments of the present disclosure so that those skilled in the art can practice them. Other embodiments may include structural, logical, electrical, process and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Parts and features of some embodiments may be included in or replace parts and features of other embodiments. Moreover, the words used in this application are only used to describe the embodiments and are not used to limit the claims. As used in the description of the embodiments and claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to also include plural forms. Similarly, the term "and / or" as used in this application refers to any and all possible combinations of one or more associated listings. In addition, when used in this application, the term "comprise" and its variations "comprises" and / or comprising refer to the presence of stated features, wholes, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or groups of these. In the absence of further restrictions, an element defined by the sentence "comprising a..." does not exclude the presence of other identical elements in the process, method or device that includes the element. In this article, each embodiment may focus on the differences from other embodiments, and the same and similar parts between the various embodiments can be referenced to each other. For the methods, products, etc. disclosed in the embodiments, if they correspond to the method part disclosed in the embodiments, then the relevant parts can be found in the description of the method part.

[0096] Those skilled in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software may depend on the specific application and design constraints of the technical solution. The technicians may use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure. The technicians will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0097] In the embodiments disclosed herein, the disclosed methods and products (including but not limited to devices, equipment, etc.) can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units can be merely a logical functional division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between each other shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, and can be electrical, mechanical or other forms. The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the units may be selected to implement this embodiment according to actual needs. In addition, the functional units in the embodiments of the present disclosure may be integrated into a processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0098] The flowcharts and block diagrams in the accompanying drawings show the possible implementation architectures, functions and operations of the systems, methods and computer program products according to the embodiments of the present disclosure. In this regard, each box in the flowchart or block diagram can represent a module, program segment or part of the code, and the module, program segment or part of the code contains one or more executable instructions for implementing the specified logical functions. In some alternative implementations, the functions marked in the box can also occur in an order different from that marked in the accompanying drawings. For example, two consecutive boxes can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. In the descriptions corresponding to the flowcharts and block diagrams in the accompanying drawings, the operations or steps corresponding to different boxes can also occur in an order different from that disclosed in the description, and sometimes there is no specific order between different operations or steps. For example, two consecutive operations or steps can actually be executed substantially in parallel, or they can sometimes be executed in the opposite order, which can depend on the functions involved. Each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, may be implemented by a dedicated hardware-based system that performs the specified function or action, or may be implemented by a combination of dedicated hardware and computer instructions.

Claims

1. A control method for preventing dry burning of a stove, wherein the stove is provided with a temperature detection device and a capacitance detection device, characterized in that: The capacitance detection device includes an electrode plate and a capacitance detection circuit; wherein the electrode plate includes an upper electrode plate and a lower electrode plate, the upper electrode plate being in contact with the cookware; the upper electrode plate and the lower electrode plate are arranged in parallel to form a parallel plate capacitor; the area of the upper electrode plate is smaller than that of the lower electrode plate; when the cookware is made of metal, the cookware and the upper electrode plate together form the upper electrode plate of the capacitor; The control method includes: Detect the temperature information of the pot; When the temperature information of the cookware satisfies a first condition, obtaining a capacitance value detected by a capacitance detection device; the first condition is used to indicate that the temperature change of the cookware conforms to the temperature change of a metal material; the first condition includes that the heating rate of the cookware is greater than a first set rate; or the heating rate of the cookware is less than a second set rate, and the rate of change of the heating rate is less than 0; When a capacitance difference between the capacitance value and the initial capacitance value is greater than or equal to a preset capacitance difference, performing an anti-dry-burning operation corresponding to the temperature information; When the capacitance difference between the capacitance value and the initial capacitance value is less than the preset capacitance difference, an anti-dry-burn operation corresponding to the capacitance value is performed.

2. The method according to claim 1, characterized in that The value of the first set rate is determined according to the fire power of the stove.

3. The method according to claim 1, characterized in that The higher the firepower of the stove is, the higher the value of the corresponding first set rate is.

4. The method according to claim 1, wherein The capacitance value is determined according to the oscillation frequency of the oscillation circuit in which the capacitor is located.

5. The method according to claim 4, characterized in that The capacitance value is obtained as follows: Among them, C0 is the capacitance value of the capacitor formed by the cookware and the electrode plate, L is the inductance value of the inductor L in the oscillation circuit, and f is the oscillation frequency.

6. The method according to any one of claims 1 to 5, characterized in that: Executing an anti-dry-burning operation corresponding to the temperature information or the capacitance value, including: Execute the anti-dry-burning operation corresponding to the temperature information, and reduce the heat when the temperature of the pot bottom is greater than or equal to the first set value; or Execute the anti-dry-burning operation corresponding to the capacitance value, and reduce the firepower when the temperature of the pot bottom is greater than or equal to the second set value; The first setting value is higher than the second setting value.

7. A control device for preventing dry burning of a stove, comprising a processor and a memory storing program instructions, characterized in that: The processor is configured to execute the control method for preventing dry burning of a cooker according to any one of claims 1 to 6 when executing the program instructions.

8. A stove, characterized in that: The invention comprises the control device for preventing dry burning of a stove as claimed in claim 7.

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