A cooking appliance and a cooking appliance control method

Abstract

The application discloses a stove and a stove control method. The method comprises the following steps: when it is monitored that the detection result indicates that there is a human body in a predetermined area around the stove, and the cooking state is switched to a dry burning early warning state, controlling the warning module to issue dry burning early warning information, and adjusting the opening degree of the proportional valve by the following steps: obtaining a target temperature corresponding to the dry burning early warning state, calculating the target opening degree of the proportional valve according to the cooking temperature, the target temperature and the temperature change rate, controlling the opening degree of the proportional valve to adjust to the target opening degree to reduce the cooking firepower; when it is monitored that the cooking state is switched to a dry burning alarm state, controlling the opening degree of the proportional valve to adjust to a preset minimum opening degree, and controlling the warning module to issue dry burning alarm information; when it is monitored that the cooking state is switched to an extinguishing protection state, controlling the proportional valve to be completely closed, and controlling the warning module to issue an extinguishing protection notification. According to the application, the balance between cooking quality and dry burning protection can be considered.

Description

Technical Field

[0001] This application relates to the field of stove technology, and in particular to a stove and a stove control method. Background Technology

[0002] Currently, to improve the safety of stove use, some stoves are equipped with anti-dry-burning protection function, which mainly uses a temperature sensor to detect the temperature of the pot. When the pot temperature reaches the preset protection threshold, the controller performs a valve shut-off action to cut off the gas supply.

[0003] However, this anti-dry-burning protection method still has obvious shortcomings in actual use: the protection action is seriously delayed, often only activating when the cookware is already in a very obvious dry-burning state (such as when the food is burnt), and the protection action is to directly cut off the heat, forcing the cooking process to be interrupted and affecting the cooking quality. Summary of the Invention

[0004] This application provides a stove and a stove control method. The method effectively solves the problems of traditional anti-dry-burning protection either triggering only when dry-burning occurs and thus failing to intervene in time, or the protection action being too violent and directly cutting off the flame, affecting the cooking quality. It takes into account both the cooking quality and the anti-dry-burning protection.

[0005] In one aspect, a cooktop is provided, including: a human body detection module, configured to detect whether a human body exists in a predetermined area around the cooktop, and output the detection result accordingly; A proportional valve is configured to regulate cooking heat. A temperature sensor is configured to detect cooking temperature; The alarm module is configured to output alarm information; The controller, connected to the human detection module, proportional valve, temperature sensor, and alarm module respectively, is configured as follows: Obtain test results and cooking temperature; Calculate the rate of temperature change based on the cooking temperature, and identify the cooking state based on the cooking temperature and the rate of temperature change. When the detection result indicates the presence of a human body within the predetermined area and the cooking state is switched to the dry burning warning state, the control alarm module issues a dry burning warning message and adjusts the opening of the proportional valve through the following steps: obtaining the target temperature corresponding to the dry burning warning state, calculating the target opening of the proportional valve based on the cooking temperature, the target temperature and the temperature change rate, and controlling the opening of the proportional valve to adjust to the target opening to reduce the cooking heat. In the dry burning warning state, the temperature change rate is greater than the first preset temperature change rate threshold and the cooking temperature is less than the first preset temperature threshold. When the detection result indicates the presence of a human body in the predetermined area and the cooking state is switched to the dry burning alarm state, the opening of the proportional valve is adjusted to the preset minimum opening, and the alarm module is controlled to issue a dry burning alarm message. In the dry burning alarm state, the cooking temperature is greater than or equal to the first preset temperature threshold and the cooking temperature is less than the second preset temperature threshold. When the detection result indicates the presence of a human body within the predetermined area and the cooking state switches to the flameout protection state, the proportional control valve is completely closed, and the alarm module is controlled to issue a flameout protection notification. In the flameout protection state, the cooking temperature is greater than or equal to the second preset temperature threshold.

[0006] Secondly, a cooktop control method is provided, including: acquiring detection results and cooking temperature; Calculate the rate of temperature change based on the cooking temperature, and identify the cooking state based on the cooking temperature and the rate of temperature change. When a human body is detected in the predetermined area around the stove and the cooking state is switched to the dry burning warning state, the control alarm module issues a dry burning warning message and adjusts the opening of the proportional valve through the following steps: obtain the target temperature corresponding to the dry burning warning state, calculate the target opening of the proportional valve based on the cooking temperature, the target temperature and the temperature change rate, and control the opening of the proportional valve to adjust to the target opening to reduce the cooking firepower. In the dry burning warning state, the temperature change rate is greater than the first preset temperature change rate threshold and the cooking temperature is less than the first preset temperature threshold. When the cooking state is detected to switch to the dry burning alarm state, the opening of the proportional valve is adjusted to the preset minimum opening, and the alarm module is controlled to issue a dry burning alarm message. In the dry burning alarm state, the cooking temperature is greater than or equal to the first preset temperature threshold and the cooking temperature is less than the second preset temperature threshold. When the cooking state is detected to switch to the flameout protection state, the proportional control valve is completely closed and the alarm module is controlled to issue a flameout protection notification. In the flameout protection state, the cooking temperature is greater than or equal to the second preset temperature threshold.

[0007] In the above embodiments, a stove and a stove control method are provided, which sets three progressively advancing safety states: a dry-burning warning state, a dry-burning alarm state, and a flameout protection state. In the dry-burning warning state, the opening of the proportional valve is smoothly reduced by a PID controller. This not only allows for adjustments during cooking (such as allowing the user to add water or turn off the heat in time) but also avoids the problem of deteriorating food quality due to sudden changes in heat. When the cooking temperature continues to rise to the dry-burning alarm state, the opening of the proportional valve is reduced to a preset minimum opening, maintaining only a very low heat and slowing down the rise in cooking temperature. When the cooking temperature continues to rise to the flameout protection state, the proportional valve is shut off to cut off the gas supply, fundamentally eliminating the safety risk. This progressively advancing, from light to heavy heat reduction method effectively solves the problems of traditional dry-burning protection either triggering only when dry-burning occurs, failing to intervene early, or having an overly drastic protection action that directly cuts off the heat, affecting cooking quality. It balances cooking quality and dry-burning protection. Attached Figure Description

[0008] Figure 1 This is a structural schematic diagram of a stove provided in an embodiment of this application; Figure 2 This is a schematic diagram of the structure of a human body detection module provided in an embodiment of this application; Figure 3 This is a structural block diagram of a controller provided in an embodiment of this application; Figure 4 This is a flowchart of a stove control method provided in an embodiment of this application; Figure 5 This is a flowchart illustrating the identification of cooking status provided in an embodiment of this application; Figure 6 This is a schematic diagram illustrating the switching of cooking states during the cooking process, provided in an embodiment of this application. Figure 7 This is a flowchart of calculating the target aperture provided in an embodiment of this application; Figure 8 This is a flowchart of another stove control method provided in the embodiments of this application; Figure 9 This is a flowchart illustrating a stove control example provided in an embodiment of this application; Figure 10 This is a schematic diagram illustrating the extended functionality of a controller provided in an embodiment of this application. Detailed Implementation

[0009] To make the objectives and implementation methods of this application clearer, the exemplary implementation methods of this application will be clearly and completely described below with reference to the accompanying drawings of the exemplary embodiments of this application. Obviously, the exemplary embodiments described are only some embodiments of this application, and not all embodiments.

[0010] It should be noted that the brief descriptions of terms in this application are only for the convenience of understanding the embodiments described below, and are not intended to limit the embodiments of this application. Unless otherwise stated, these terms should be understood in their ordinary and common meaning.

[0011] The terms "first," "second," "third," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish similar or related objects or entities, and do not necessarily imply a specific order or sequence, unless otherwise specified. It should be understood that such terms are interchangeable where appropriate.

[0012] The terms “comprising” and “having”, and any variations thereof, are intended to cover but not exclude inclusion, for example, a product or device that includes a range of components is not necessarily limited to all of the components that are clearly listed, but may include other components that are not clearly listed or that are inherent to such product or device.

[0013] The stove provided in this application can have various implementation forms, such as integrated stove, countertop stove, built-in stove, single-burner stove, double-burner stove or multi-burner stove, etc., and this application does not limit it.

[0014] Figure 1 This is a structural schematic diagram of a stove provided in an embodiment of this application. See also... Figure 1 The stove includes a human body detection module 10, which is configured to detect whether there is a human body in a predetermined area around the stove and output the detection result accordingly. The proportional valve 20 is configured to regulate the cooking heat. Temperature sensor 30 is configured to detect cooking temperature; Alarm module 40 is configured to output alarm information; The controller 50 is connected to the human body detection module 10, the proportional valve 20, the temperature sensor 30, and the alarm module 40, respectively.

[0015] Specifically, the designated area refers to a specific spatial range around the stove that has been pre-demarcated to determine whether a human body is present.

[0016] For example, Figure 2 This is a schematic diagram of the structure of a human body detection module provided in an embodiment of this application. See also... Figure 2The human detection module 10 includes a human detection sensor 11, a power supply unit 12, and a status indicator light 13. The human detection sensor 11 is used to detect whether there is a human body in a predetermined area around the stove. The human detection sensor 11 can be, for example, a PIR human infrared sensor, which can detect whether there is a person within a range of 2-5 meters around the stove, with a detection angle ≥120°, or it can be an ultrasonic sensor, etc. The power supply unit 12 is used to supply power to the human detection sensor and the status indicator light. The status indicator light 13 is used to indicate the working status of the human detection module 10 (such as working status, sleep status, or fault status, etc.). The status indicator light 13 can be, for example, an LED light, etc.

[0017] Specifically, the proportional valve 20 is used to achieve stepless regulation of gas flow. The opening degree of the proportional valve 20 is positively correlated with the gas flow. The proportional valve 20 can be driven by, for example, a PWM signal or a DAC signal.

[0018] Specifically, the temperature sensor 30 is used to detect the cooking temperature, which can be, for example, the temperature of the bottom of the pot, the internal temperature of the pot, the temperature of the pot wall, or the temperature of the stove head. The temperature sensor 30 can be, for example, an infrared temperature sensor.

[0019] Of course, cooktops can also include thermocouples and flame detection sensors, where thermocouples are used to detect ambient temperature and flame detection sensors are used to detect the burner flame status.

[0020] Specifically, the alarm module 40 is used to output alarm information to the user. The alarm module 40 may include, for example, an audible and visual alarm unit, which may include, for example, an LED light and a buzzer.

[0021] Of course, the cooktop may also include a display panel and / or an opening adjustment control. The display panel is used to display cooking status, cooking temperature, ambient temperature, fault information, etc., and the opening adjustment control is used by the user to manually adjust the opening of the proportional valve 20. The opening adjustment control can be, for example, a knob control or a touch control.

[0022] For example, Figure 3 This is a structural block diagram of a controller provided in an embodiment of this application. See also... Figure 3The controller 50 includes a processor 51 and a memory 52 storing computer program instructions. The processor 51 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement embodiments of this disclosure. The memory 52 may include a mass storage device for information or instructions. For example, and not limitingly, the memory 52 may include a hard disk drive (HDD), a floppy disk drive, flash memory, an optical disk drive, a magneto-optical disk drive, magnetic tape, or a Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, the memory 52 may include removable or non-removable (or fixed) media. Where appropriate, the memory 52 may be internal or external to the integrated gateway device. In a particular embodiment, the memory 52 is a non-volatile solid-state memory. In a particular embodiment, the memory 52 includes read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (Electrically Programmable ROM, EPROM), an electrically erasable PROM (EEPROM), an electrically alterable ROM (EAROM), or flash memory, or a combination of two or more of these. The processor 51 executes the steps of the stove control method provided in this disclosure by reading and executing computer program instructions stored in the memory 52. ​​In one example, the controller 50 may further include a transceiver 53 and a bus 54. As shown in the figure, the processor 51, memory 52, and communication interface are connected via the bus 54 and communicate with each other. The communication interface can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN)), wireless local area networks (WLAN), etc. The communication interface may be a module, circuit, transceiver, or any device capable of communication. Bus 54 includes peripheral component interconnect (PCI) lines or extended industry standard architecture (EISA) buses, etc.Bus 54 can be divided into address bus, data bus, control bus, etc.

[0023] In some embodiments, the controller is configured to acquire detection results and cooking temperature; Calculate the rate of temperature change based on the cooking temperature, and identify the cooking state based on the cooking temperature and the rate of temperature change. When the detection result indicates the presence of a human body within the predetermined area and the cooking state is switched to the dry burning warning state, the control alarm module issues a dry burning warning message and adjusts the opening of the proportional valve through the following steps: obtaining the target temperature corresponding to the dry burning warning state, calculating the target opening of the proportional valve based on the cooking temperature, the target temperature and the temperature change rate, and controlling the opening of the proportional valve to adjust to the target opening to reduce the cooking heat. In the dry burning warning state, the temperature change rate is greater than the first preset temperature change rate threshold and the cooking temperature is less than the first preset temperature threshold. When the detection result indicates the presence of a human body in the predetermined area and the cooking state is switched to the dry burning alarm state, the opening of the proportional valve is adjusted to the preset minimum opening, and the alarm module is controlled to issue a dry burning alarm message. In the dry burning alarm state, the cooking temperature is greater than or equal to the first preset temperature threshold and the cooking temperature is less than the second preset temperature threshold. When the detection result indicates the presence of a human body within the predetermined area and the cooking state switches to the flameout protection state, the proportional control valve is completely closed, and the alarm module is controlled to issue a flameout protection notification. In the flameout protection state, the cooking temperature is greater than or equal to the second preset temperature threshold.

[0024] In some embodiments, when identifying the cooking state based on cooking temperature and rate of temperature change, the controller is specifically configured to: If the cooking temperature is lower than the third preset temperature threshold, the cooking state is determined to be a cold pot state. If the cooking temperature is greater than or equal to the third preset temperature threshold, the cooking temperature is less than the fourth preset temperature threshold, and the temperature change rate is greater than the second preset temperature change rate threshold, the cooking state is determined to switch from the cold pot state to the heating state. If the cooking temperature is greater than or equal to the fourth preset temperature threshold and the temperature change rate is less than the third preset temperature change rate threshold, the cooking state is determined to switch from the heating state to the boiling state. If the rate of temperature change is less than the fourth preset temperature change rate threshold, the cooking state is determined to switch from boiling state to maintaining cooking state. If the rate of temperature change is greater than the first preset rate of temperature change threshold and the cooking temperature is less than the first preset temperature threshold, the cooking state is determined to switch from the cooking state to the dry burning warning state. If the cooking temperature is greater than or equal to the first preset temperature threshold and less than the second preset temperature threshold, the cooking state is switched from the dry burning warning state to the dry burning alarm state. If the cooking temperature is greater than or equal to the second preset temperature threshold, the cooking state is switched from the dry burning alarm state to the flameout protection state.

[0025] In some embodiments, when obtaining the target temperature corresponding to the dry-burning warning state, the controller is specifically configured as follows: Obtain the target temperature data corresponding to the dish currently being cooked; Obtain the temperature corresponding to the dry burning warning state from the target temperature data, and use it as the target temperature corresponding to the dry burning warning state.

[0026] In some embodiments, when calculating the target opening degree of the proportional valve based on the cooking temperature, the target temperature, and the rate of temperature change, the controller is specifically configured as follows: Calculate the deviation between the target temperature and the cooking temperature; Determine the target proportional coefficient, target integral coefficient, and target differential coefficient based on the temperature change rate; Calculate the opening correction amount based on the deviation, target proportional coefficient, target integral coefficient, and target differential coefficient; The target opening is obtained by summing the opening correction amount and the preset reference opening, where the preset reference opening is determined according to the cooking state.

[0027] In some embodiments, when determining the proportional coefficient, integral coefficient, and derivative coefficient based on the rate of temperature change, the controller is specifically configured as follows: Obtain the initial proportional coefficient, initial integral coefficient, and initial derivative coefficient; If the rate of temperature change is greater than the fifth preset temperature change rate threshold, decrease the initial proportional coefficient to obtain the target proportional coefficient, use the initial integral coefficient as the target integral coefficient, increase the initial differential coefficient to obtain the target differential coefficient.

[0028] In some embodiments, the controller is further configured to: When the detection result indicates that there is no human body in the predetermined area and the duration of no human body presence does not reach the preset time threshold, the opening of the proportional valve is gradually reduced to the preset minimum opening. When the detection results indicate that there are no human beings in the predetermined area and the duration of the absence of human beings reaches a preset time threshold, the proportional valve is closed.

[0029] In some embodiments, when the opening of the proportional valve is gradually reduced to a preset minimum opening, the controller is specifically configured as follows: Obtain user cooking preferences; If the user's cooking preference is set to automatic protection, the opening of the proportional valve will gradually decrease to the preset minimum opening.

[0030] In some embodiments, the controller is further configured to: If the detection results indicate that there is no human body in the predetermined area, the duration of no human presence does not reach the preset time threshold, and the user's cooking preference is remote notification preference, an unattended notification is sent to the user terminal. After receiving the user-specified opening degree from the user terminal, the opening degree of the control proportional valve is gradually adjusted to the user-specified opening degree.

[0031] In some embodiments, as the opening of the proportional valve gradually decreases to a preset minimum opening, the controller is further configured to: If the cooking mode is switched to the dry burning warning mode, adjust the opening of the proportional valve by following these steps: obtain the target temperature corresponding to the dry burning warning mode, calculate the target opening of the proportional valve based on the cooking temperature, the target temperature and the temperature change rate, and control the opening of the proportional valve to adjust to the target opening to reduce the cooking heat. If the cooking mode switches to the dry-burning alarm mode, the opening of the proportional valve is adjusted to the preset minimum opening.

[0032] Figure 4 This is a flowchart of a stove control method provided in an embodiment of this application. See also... Figure 4 The method includes the following steps.

[0033] S110, Obtain the test results and cooking temperature.

[0034] Specifically, the human detection module can detect the presence of a human body in a preset area in real time within a preset time period (such as the user-defined breakfast, lunch, and dinner periods), or it can detect the presence of a human body in a preset area in real time after the proportional valve is opened, but it is not limited to this. The detection results are then sent to the controller in real time.

[0035] Similarly, the temperature sensor can detect the cooking temperature in real time within a preset time period, or it can detect the cooking temperature in real time after the proportional valve opens, but it is not limited to these methods. The cooking temperature is then sent to the controller in real time.

[0036] S120. Calculate the temperature change rate based on the cooking temperature, and identify the cooking state based on the cooking temperature and the temperature change rate.

[0037] Specifically, the temperature change rate refers to the amount of change in cooking temperature per unit time, used to characterize how quickly cooking temperature changes over time. The temperature change is obtained by subtracting the current cooking temperature from the cooking temperature acquired in the previous data collection period, and then dividing the temperature change by the data collection period to obtain the temperature change rate.

[0038] Figure 5 This is a flowchart illustrating the identification of cooking states according to an embodiment of this application. See also... Figure 5 Optionally, the cooking state can be identified based on the cooking temperature and the rate of temperature change, including: S121, if the cooking temperature is less than a third preset temperature threshold, the cooking state is determined to be a cold pot state.

[0039] S122. If the cooking temperature is greater than or equal to the third preset temperature threshold, the cooking temperature is less than the fourth preset temperature threshold, and the temperature change rate is greater than the second preset temperature change rate threshold, the cooking state is switched from the cold pot state to the heating state.

[0040] S123. If the cooking temperature is greater than or equal to the fourth preset temperature threshold and the temperature change rate is less than the third preset temperature change rate threshold, determine that the cooking state is switched from the heating state to the boiling state.

[0041] S124. If the temperature change rate is less than the fourth preset temperature change rate threshold, determine that the cooking state is switched from boiling state to maintaining cooking state.

[0042] S125. If the temperature change rate is greater than the first preset temperature change rate threshold and the cooking temperature is less than the first preset temperature threshold, determine that the cooking state is switched from the maintain cooking state to the dry burning warning state.

[0043] S126. If the cooking temperature is greater than or equal to the first preset temperature threshold and the cooking temperature is less than the second preset temperature threshold, the cooking state is switched from the dry burning warning state to the dry burning alarm state.

[0044] S127. If the cooking temperature is greater than or equal to the second preset temperature threshold, the cooking state is switched from the dry burning alarm state to the flameout protection state.

[0045] Specifically, the controller has preset temperature thresholds of 1, 2, 3, and 4, as well as a first preset temperature change rate threshold, a second preset temperature change rate threshold, a third preset temperature change rate threshold, and a fourth preset temperature change rate threshold, used to distinguish different cooking states. Among these, the second preset temperature threshold > the first preset temperature threshold > the fourth preset temperature threshold > the third preset temperature threshold; and the first preset temperature change rate threshold > the third preset temperature change rate threshold > the fourth preset temperature change rate threshold > the second preset temperature change rate threshold.

[0046] The third preset temperature (with a range of, for example, 30°C to 70°C) is the critical temperature threshold between the cold pot state and the heating state.

[0047] The fourth preset temperature threshold is the critical value for determining the temperature between the heating state and the boiling state.

[0048] The second preset temperature change rate threshold is the critical value for determining the temperature change rate between the heating state and the boiling state.

[0049] The third preset temperature change rate threshold is the critical value for determining the temperature change rate between the heating state and the boiling state.

[0050] The fourth preset temperature change rate threshold is the critical value for determining the temperature change rate between the boiling state and the cooking state.

[0051] The first preset temperature change rate threshold is the critical value for determining the temperature change rate between maintaining the cooking state and the dry burning warning state.

[0052] The first preset temperature threshold is the critical value for determining the temperature between maintaining the cooking state and the dry burning warning state.

[0053] The second preset temperature threshold is the critical temperature value for determining the difference between the dry-burning alarm state and the flameout protection state.

[0054] Specifically, the "cold pot state" refers to the initial heating stage after the stove is ignited, when the cooking temperature has not yet fully risen and is in the range of ambient temperature to low temperature.

[0055] Specifically, the heating state refers to the stage where the stove has moved from the cold pot state, and the cooking temperature continues to rise but has not yet reached the boiling temperature.

[0056] Specifically, the boiling state refers to the transitional stage where the food in the pot reaches its boiling point and the temperature slowly rises.

[0057] Specifically, maintaining the cooking state refers to the stage where the cooking temperature has stabilized.

[0058] Specifically, the dry-burning warning state refers to the early warning stage when the moisture inside the cookware is about to evaporate and the cooking temperature begins to rise abnormally.

[0059] Specifically, the dry-burning alarm state refers to a serious warning stage where the temperature of the cookware has significantly deviated from the normal cooking range, and the risk of dry burning has escalated.

[0060] Specifically, the flameout protection state refers to the extreme protection stage where the temperature of the cookware has exceeded the safety limit and heating must be stopped immediately.

[0061] For example, Figure 6 This is a schematic diagram illustrating the switching of cooking states during the cooking process, provided in an embodiment of this application. See also... Figure 6After the stove is successfully ignited, the cooking temperature starts to rise from the ambient temperature. When the cooking temperature is lower than the third preset temperature threshold (e.g., 50°C), the stove is determined to be in a cold state. When the cooking temperature continues to rise to a level greater than or equal to the third temperature threshold but has not yet reached the fourth preset temperature threshold, and the temperature change rate is greater than the second preset temperature change rate threshold (e.g., 0), the stove is determined to be in a heating state. When the cooking temperature continues to rise to a level greater than or equal to the fourth temperature threshold, and the temperature change rate is less than the third preset temperature change rate threshold, the stove enters a boiling state. When the cooking temperature stabilizes (i.e., the temperature change rate is less than the fourth preset temperature change rate threshold), the stove is determined to be in a maintaining cooking state. While maintaining cooking mode, the controller performs dry-burn monitoring: if the temperature change rate exceeds a first preset temperature change rate threshold (e.g., 2°C / s), it determines that the moisture in the pot is about to evaporate and enters a dry-burn warning state; if the cooking temperature continues to rise and exceeds the first preset temperature threshold (e.g., 220°C) during the dry-burn warning state, it enters a dry-burn protection state; when the cooking temperature exceeds a second temperature threshold (e.g., 220°C), it determines that the stove is in a dry-burn alarm state; if the cooking temperature continues to rise and exceeds the second preset temperature threshold (e.g., 280°C) during the dry-burn alarm state, it enters a flameout protection state. Of course, the controller can also obtain the target temperature data corresponding to the currently cooked dish (including the target temperature corresponding to each cooking state). The controller integrates a PID controller. From the moment the stove is successfully ignited until it enters the dry-burning warning state, the PID controller adjusts the opening of the proportional valve based on the cooking temperature, target temperature, and temperature change rate. The proportional coefficient, integral coefficient, and derivative coefficient follow the following fuzzy correction rules: When the temperature change rate is small (i.e., less than the fifth preset temperature change rate threshold) and the temperature deviation is large (i.e., greater than the preset deviation threshold), that is, when the cooking temperature rises slowly but is still far from the target value, the initial proportional coefficient is increased to obtain the target proportional coefficient required at the moment, thereby speeding up the system's response and allowing the cooking temperature to quickly approach the target temperature corresponding to the current cooking state, shortening the heating time; when the temperature deviation approaches zero, that is, when the cooking temperature is close to the target temperature corresponding to the current cooking state, the initial proportional coefficient, initial integral coefficient, and initial derivative coefficient are kept unchanged to avoid frequent operation of the proportional valve due to sensor noise or minor disturbances, reducing unnecessary adjustments.

[0062] S130. When the detection result indicates the presence of a human body in the predetermined area and the cooking state is switched to the dry burning warning state, the control alarm module issues a dry burning warning message and adjusts the opening of the proportional valve through the following steps: obtain the target temperature corresponding to the dry burning warning state, calculate the target opening of the proportional valve based on the cooking temperature, the target temperature and the temperature change rate, and control the opening of the proportional valve to adjust to the target opening to reduce the cooking heat.

[0063] Specifically, a PID controller is used to reduce the opening of the proportional valve based on the cooking temperature, target temperature, and rate of temperature change, thereby reducing the cooking heat.

[0064] In some embodiments, the target temperature corresponding to the dry burning warning state is preset by the user.

[0065] In other embodiments, obtaining the target temperature corresponding to the dry burning warning state includes: obtaining the target temperature data corresponding to the dish being cooked; Obtain the temperature corresponding to the dry burning warning state from the target temperature data, and use it as the target temperature corresponding to the dry burning warning state.

[0066] Specifically, the target temperature data records the target temperature corresponding to each cooking state while cooking the current dish. Of course, in some other embodiments, the target temperature data can be further refined to the target temperature corresponding to each moment under the same cooking state.

[0067] Understandably, by first obtaining the target temperature data corresponding to the dish being cooked, and then extracting the target temperature corresponding to the dry burning warning state from the target temperature data, the stove can obtain a cooling target value that is suitable for the dish being cooked when it enters the dry burning warning state. In this way, under the premise of ensuring safety, differentiated cooling strategies can be implemented according to different dishes, thereby improving the cooking taste of the dishes.

[0068] Figure 7 This is a flowchart illustrating the calculation of a target aperture according to an embodiment of this application. See also... Figure 7 Optionally, the target opening degree of the proportional valve can be calculated based on the cooking temperature, target temperature, and rate of temperature change, including: S131. Calculate the deviation between the target temperature and the cooking temperature.

[0069] S132. Determine the target proportional coefficient, target integral coefficient, and target differential coefficient based on the temperature change rate.

[0070] S133. Calculate the opening correction amount based on the deviation, target proportional coefficient, target integral coefficient, and target differential coefficient.

[0071] S134. Sum the opening correction amount and the preset reference opening to obtain the target opening, wherein the preset reference opening is determined according to the cooking state.

[0072] Specifically, e(t) = T_target - T_current, where e(t) is the deviation at time t, T_target is the target temperature, and T_current is the cooking temperature at the current time.

[0073] Optionally, the proportional coefficient, integral coefficient, and differential coefficient are determined based on the rate of temperature change, including: obtaining the initial proportional coefficient, initial integral coefficient, and initial differential coefficient; If the rate of temperature change is greater than the fifth preset temperature change rate threshold, decrease the initial proportional coefficient to obtain the target proportional coefficient, use the initial integral coefficient as the target integral coefficient, increase the initial differential coefficient to obtain the target differential coefficient.

[0074] Specifically, the controller has preset initial proportional coefficient, initial integral coefficient, and initial derivative coefficient as reference parameters for the PID controller. The initial proportional coefficient, initial integral coefficient, and initial derivative coefficient can be pre-calibrated at the factory or manually set by the user.

[0075] During cooking, the controller uses the initial proportional coefficient, initial integral coefficient, and initial derivative coefficient as a benchmark, and performs real-time corrections on these coefficients according to fuzzy correction rules to obtain the target proportional coefficient, target integral coefficient, and target derivative coefficient. In addition to the two rules mentioned above, the fuzzy correction rules may also include: when the temperature change rate is large (i.e., greater than the fifth preset temperature change rate threshold), meaning the cooking temperature rises too quickly, the initial proportional coefficient is decreased to obtain the target proportional coefficient, and the initial derivative coefficient is increased to obtain the target derivative coefficient. This reduces the sensitivity to deviations and prevents further increases in heat from exacerbating the temperature rise.

[0076] Specifically, PID_output = Kp×e(t) + Ki×∫e(t)dt + Kd×de(t) / dt, where PID_output is the opening correction, Kp×e(t) is the proportional term used to quickly respond to deviations, Kp is the target proportional coefficient, Ki×∫e(t)dt is the integral term used to eliminate steady-state errors, Ki is the target integral coefficient, and Kd×de(t) / dt is the derivative term used to suppress temperature overshoot, Kd is the target derivative coefficient.

[0077] Specifically, the preset reference opening degree refers to the basic opening degree value of the proportional valve under a specific cooking state.

[0078] Specifically, Valve = PID_output + Fuzzy_correction, where Valve is the target opening and Fuzzy_correction is the preset baseline opening.

[0079] Of course, the target opening can also be limited to make it greater than or equal to 0% and less than or equal to ≤100%.

[0080] Understandably, in the event of a dry-burning warning, compared to the traditional method of directly adjusting to a fixed low heat, this application uses PID control to dynamically adjust the opening of the proportional valve, making the heat reduction process smooth and controllable, avoiding sudden drops in heat that could cause the flame to go out or drastic fluctuations in the cookware temperature. This smooth heat reduction method provides a buffer time for manual intervention and avoids cooking interruptions caused by excessive heat reduction.

[0081] For example, in the case of a dry burning warning, the LED displays a yellow warning.

[0082] S140. When the detection result indicates that there is a human body in the predetermined area and the cooking state is switched to dry burning alarm, the opening degree of the proportional valve is adjusted to the preset minimum opening degree, and the alarm module is controlled to issue a dry burning alarm message.

[0083] Specifically, the preset minimum opening degree refers to the minimum degree of opening that the proportional valve is allowed to maintain in the dry-burning alarm state, used to prevent the flame from being completely extinguished while ensuring safety. For example, the value range of the preset minimum opening degree is 5% to 10%.

[0084] For example, in the dry-burning alarm state, the buzzer sounds an alarm.

[0085] S150. When the detection result indicates that there is a human body in the predetermined area and the cooking state is switched to the flameout protection state, the proportional valve is completely closed and the alarm module is controlled to issue a flameout protection notification.

[0086] For example, a continuous audible and visual alarm is activated when the flameout protection is enabled.

[0087] In this embodiment, compared to traditional stoves that directly cut off the gas when dry burning is detected, this application sets up three progressively advancing safety states: a dry burning warning state, a dry burning alarm state, and a flameout protection state. In the dry burning warning state, the PID controller smoothly reduces the opening of the proportional valve, allowing for adjustments during cooking (such as adding water or turning off the gas), while also preventing a decrease in food quality due to sudden changes in heat. When the cooking temperature continues to rise to the dry burning alarm state, the proportional valve opening is reduced to a preset minimum, maintaining only a very low heat and slowing the temperature rise. When the cooking temperature continues to rise to the flameout protection state, the proportional valve is shut off, cutting off the gas and fundamentally eliminating the safety risk. This progressively increasing heat reduction method effectively solves the problems of traditional dry burning protection systems either triggering only when dry burning occurs, failing to intervene early, or having overly abrupt flameout actions that affect cooking quality, thus balancing cooking quality and dry burning protection.

[0088] Figure 8 This is a flowchart of another stove control method provided in the embodiments of this application, see [link to flowchart]. Figure 8 The method also includes: S160. When the detection result indicates that there is no human body in the predetermined area and the duration of no human body presence does not reach the preset time threshold, the opening degree of the proportional valve is gradually reduced to the preset minimum opening degree.

[0089] Specifically, those skilled in the art can set the specific value of the preset time threshold according to the actual situation, and this application does not limit it in this regard. For example, the range of the preset time threshold can be 3 minutes to 8 minutes, such as 5 minutes, but it is not limited to this.

[0090] In some embodiments, controlling the opening of the proportional valve to gradually decrease to a preset minimum opening includes: acquiring user cooking preferences; if the user cooking preference is an automatic protection preference, controlling the opening of the proportional valve to gradually decrease to the preset minimum opening.

[0091] Optionally, the method further includes: when the detection result indicates that there is no human body in the predetermined area, the duration of no human presence has not reached a preset time threshold, and the user's cooking preference is remote notification preference, sending an unattended notification to the user terminal, and after receiving the user-specified opening degree returned by the user terminal, controlling the opening degree of the proportional valve to gradually adjust to the user-specified opening degree.

[0092] Specifically, users can interact with the system via the display panel and pre-set their cooking preferences. When the system detects that no human is present within the designated area and the duration of this absence does not reach a preset time threshold, the pre-set cooking preferences can be retrieved. If the user's preference is for automatic protection, it indicates that the user prefers the controller to automatically perform safety protection operations. In this case, the controller can automatically control the proportional valve opening to gradually decrease to a preset minimum opening to reduce heat and alleviate dry burning. The entire process requires no manual operation from the user, ensuring timely safety protection in unattended situations while reducing the user's operational burden. If the user's preference is for remote notification, it indicates that the user prefers remote decision-making. In this case, the controller sends an unattended notification to the user terminal and, upon receiving the user-specified opening from the terminal, gradually adjusts the proportional valve opening to the user-specified opening. Thus, the user can remotely and flexibly control the heat adjustment based on the time required to return to the preset area and the type of dish being cooked, ensuring timely response in unattended situations and enabling flexible control of the cooking process.

[0093] Specifically, the proportional valve's opening can be controlled to gradually decrease from its current opening to a preset minimum opening by either maintaining a constant rate of change, gradually increasing the rate of change, or gradually decreasing the rate of change. Similarly, the proportional valve's opening can be controlled to gradually decrease from its current opening to a user-specified opening by either maintaining a constant rate of change, gradually increasing the rate of change, or gradually decreasing the rate of change. However, this is not a limitation.

[0094] Optionally, the method further includes: during the process of gradually reducing the opening of the proportional valve to a preset minimum opening, if the cooking state switches to a dry-burning warning state, the opening of the proportional valve is adjusted through the following steps: obtaining the target temperature corresponding to the dry-burning warning state, calculating the target opening of the proportional valve based on the cooking temperature, the target temperature, and the temperature change rate, and controlling the opening of the proportional valve to adjust to the target opening to reduce the cooking heat; if the cooking state switches to a dry-burning alarm state, controlling the opening of the proportional valve to adjust to a preset minimum opening.

[0095] Similarly, the method also includes: during the process of gradually reducing the opening of the proportional valve to the user-specified opening, if the cooking state switches to the dry-burning warning state, the opening of the proportional valve is adjusted through the following steps: obtaining the target temperature corresponding to the dry-burning warning state, calculating the target opening of the proportional valve based on the cooking temperature, the target temperature and the temperature change rate, and controlling the opening of the proportional valve to adjust to the target opening to reduce the cooking heat; if the cooking state switches to the dry-burning alarm state, controlling the opening of the proportional valve to adjust to the preset minimum opening.

[0096] Understandably, as the opening of the proportional valve gradually decreases to the preset minimum opening (or the user-specified opening), the dry-burning warning state and the dry-burning alarm state are continuously monitored. Once the cooking state is detected to switch to the dry-burning warning state and the dry-burning alarm state, the safety protection strategy corresponding to the dry-burning warning state and the dry-burning alarm state is prioritized for protection, thereby improving the reliability of safety protection.

[0097] S170. When the detection result indicates that there is no human body in the predetermined area and the duration of no human body presence reaches a preset time threshold, the proportional valve is closed.

[0098] Optionally, when the detection result indicates that there is no human body in the predetermined area and the duration of no human body presence does not reach the preset time threshold, the detection result is switched to the presence of human body, and the opening of the proportional valve is restored to the opening before it was reduced.

[0099] Understandably, by not immediately closing the proportional valve when unattended operation is detected, but instead reducing the opening of the proportional valve and closing it only when the duration of unattended operation reaches a preset time threshold, the flame is reduced but not extinguished when the user leaves briefly, thus avoiding affecting normal cooking. Furthermore, the gas can be automatically cut off when the user leaves for an extended period of time, eliminating safety hazards.

[0100] To illustrate the stove control method provided in this application in detail, a specific example is provided below. Figure 9 This is a flowchart illustrating a stove control example provided in an embodiment of this application. See also... Figure 9 First, power-on initialization: The controller establishes a communication connection with the human detection module (e.g., via UART or wireless communication), begins heartbeat packet interaction, and loads default parameters (such as temperature thresholds, temperature change rate thresholds, initial proportional coefficient, initial integral coefficient, initial derivative coefficient, preset time threshold, etc.). Then, it receives detection results and cooking temperature: It receives the cooking temperature sent by the temperature sensor and the detection results sent by the human detection module. Next, cooking status identification: Based on the cooking temperature and temperature change rate, it identifies the current cooking status, determining whether it is currently in a cold pot state, heating state, boiling state, maintaining cooking state, dry-burning warning state, dry-burning alarm state, or flameout protection state. If the detection result indicates that there is no human presence within the designated area, it enters unattended mode: If the duration of no human presence does not reach the preset time threshold (default 5 minutes), the first level of protection is activated (gradually reducing the opening of the proportional valve to the preset minimum opening); if the duration of no human presence reaches the preset time threshold, the second level of protection is activated (closing the proportional valve and shutting off the flame). If the detection result indicates the presence of a human body within the designated area, the system enters the manned mode: When the monitoring cooking state switches to the dry-burning warning state, the control alarm module issues a dry-burning warning message, and adjusts the opening of the proportional valve through the following steps: Obtain the target temperature corresponding to the dry-burning warning state; calculate the target opening of the proportional valve based on the cooking temperature, target temperature, and temperature change rate; and control the opening of the proportional valve to adjust to the target opening to reduce the cooking heat. When the monitoring cooking state switches to the dry-burning alarm state, the control proportional valve opening is adjusted to the preset minimum opening, and the alarm module issues a dry-burning alarm message. When the monitoring cooking state switches to the flameout protection state, the control proportional valve is completely closed, and the alarm module issues a flameout protection notification.

[0101] To illustrate the superiority of the stove control method of this application over related technologies, the performance of this application, stoves without dry-burn protection, and stoves with fixed threshold protection in stewing dry-burn scenarios is compared, as shown in Table 1. Stoves without dry-burn protection continue to heat at high temperatures even after the moisture has evaporated, exceeding 300°C, without any protective measures. This ultimately leads to burnt food and deformed cookware, posing a serious safety hazard. Stoves with fixed threshold protection trigger a valve shut-off when the temperature reaches 280°C after the moisture has evaporated, providing a degree of passive protection. However, due to the high trigger temperature, the food is already severely burnt when the valve shuts off, limiting the protective effect. During the stewing and dry-cooking process, when the temperature change rate exceeds the first preset temperature change rate threshold, it indicates that the moisture has been significantly reduced, and the heat is automatically reduced to 40%. When the cooking temperature reaches the first preset temperature threshold, the heat is further reduced to 10%. When the cooking temperature reaches the second preset temperature threshold, the control proportional valve is completely closed to complete the safety protection. Throughout the process, the maximum temperature of the cookware is controlled within 220°C, and the food is effectively protected.

[0102] Table 1

[0103] For example, Figure 10 This is a schematic diagram illustrating the extended functionality of a controller provided in an embodiment of this application. See also... Figure 10 In addition to its anti-dry-burning protection function, the controller also supports several extended functions: First, intelligent interconnection, including OTA remote upgrade function, which updates firmware via WiFi or BLE to continuously optimize the stove control algorithm; mobile APP control function, used to remotely monitor cooking status, configure parameters used for stove control, and view cooking records; voice interaction function, used to control valve opening, set timers, and receive voice alarms; and intelligent recipe linkage function, used to achieve one-click intelligent cooking. Second, personalization and energy saving, including user habit learning function, used to automatically record and optimize various temperature thresholds and temperature change rate thresholds; energy consumption management function, used to calculate gas consumption and provide energy-saving modes; and multi-burner linkage function, used for independent control of each burner and coordination of total power. Third, safety extension, including fault self-diagnosis function, used to identify sensor faults, communication faults, proportional valve faults, and power supply abnormalities; gas leak detection function, used in conjunction with combustible gas sensors for automatic valve shut-off and exhaust activation; and child lock function, used for knob locking and operation permission management. Fourth, convenient functions include intelligent timer functions for cooking timers, preset cooking times, and multi-stage timers; and maintenance reminder functions for filter and battery replacement reminders and usage time statistics. These features enhance the user experience.

[0104] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

[0105] For ease of explanation, the above description has been provided in conjunction with specific embodiments. However, the above exemplary discussion is not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. Various modifications and variations can be obtained based on the above teachings. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, thereby enabling those skilled in the art to better utilize the described embodiments and various different variations of embodiments suitable for specific use considerations.

Claims

1. A stove, characterized in that, include: The human body detection module is configured to detect whether there are human bodies in a predetermined area around the stove and output the corresponding detection results. A proportional valve is configured to regulate cooking heat. A temperature sensor is configured to detect cooking temperature; The alarm module is configured to output alarm information; The controller, connected to the human detection module, the proportional valve, the temperature sensor, and the alarm module respectively, is configured as follows: Obtain the detection results and the cooking temperature; The temperature change rate is calculated based on the cooking temperature, and the cooking state is identified based on the cooking temperature and the temperature change rate. When the detection result indicates the presence of a human body in the predetermined area and the cooking state is switched to the dry burning warning state, the alarm module is controlled to issue a dry burning warning message, and the opening of the proportional valve is adjusted through the following steps: the target temperature corresponding to the dry burning warning state is obtained, the target opening of the proportional valve is calculated based on the cooking temperature, the target temperature and the temperature change rate, and the opening of the proportional valve is controlled to be adjusted to the target opening to reduce the cooking heat. In the dry burning warning state, the temperature change rate is greater than the first preset temperature change rate threshold and the cooking temperature is less than the first preset temperature threshold. When the detection result indicates that there is a human body in the predetermined area and the cooking state is switched to the dry burning alarm state, the opening of the proportional valve is adjusted to the preset minimum opening, and the alarm module is controlled to issue a dry burning alarm message. In the dry burning alarm state, the cooking temperature is greater than or equal to the first preset temperature threshold and the cooking temperature is less than the second preset temperature threshold. When the detection result indicates that a human body is present in the predetermined area and the cooking state is switched to the flameout protection state, the proportional valve is controlled to be completely closed and the alarm module is controlled to issue a flameout protection notification. In the flameout protection state, the cooking temperature is greater than or equal to the second preset temperature threshold.

2. The stove according to claim 1, characterized in that, When identifying the cooking state based on the cooking temperature and the rate of temperature change, the controller is specifically configured as follows: If the cooking temperature is less than the third preset temperature threshold, the cooking state is determined to be a cold pot state; If the cooking temperature is greater than or equal to the third preset temperature threshold, the cooking temperature is less than the fourth preset temperature threshold, and the temperature change rate is greater than the second preset temperature change rate threshold, the cooking state is determined to switch from the cold pot state to the heating state. If the cooking temperature is greater than or equal to the fourth preset temperature threshold and the temperature change rate is less than the third preset temperature change rate threshold, the cooking state is determined to switch from the heating state to the boiling state. If the temperature change rate is less than the fourth preset temperature change rate threshold, the cooking state is determined to switch from the boiling state to the maintaining cooking state. If the temperature change rate is greater than the first preset temperature change rate threshold and the cooking temperature is less than the first preset temperature threshold, the cooking state is determined to switch from the maintained cooking state to the dry burning warning state. If the cooking temperature is greater than or equal to the first preset temperature threshold and the cooking temperature is less than the second preset temperature threshold, the cooking state is determined to switch from the dry burning warning state to the dry burning alarm state. If the cooking temperature is greater than or equal to the second preset temperature threshold, the cooking state is determined to switch from the dry burning alarm state to the flameout protection state.

3. The stove according to claim 2, characterized in that, When obtaining the target temperature corresponding to the dry-burning warning state, the controller is specifically configured as follows: Obtain the target temperature data corresponding to the dish currently being cooked; Obtain the temperature corresponding to the dry burning warning state from the target temperature data, and use it as the target temperature corresponding to the dry burning warning state.

4. The stove according to claim 2, characterized in that, When calculating the target opening degree of the proportional valve based on the cooking temperature, the target temperature, and the temperature change rate, the controller is specifically configured as follows: Calculate the deviation between the target temperature and the cooking temperature; Determine the target proportional coefficient, target integral coefficient, and target differential coefficient based on the stated temperature change rate; The opening correction amount is calculated based on the deviation, the target proportional coefficient, the target integral coefficient, and the target differential coefficient. The target opening is obtained by summing the opening correction amount and the preset reference opening, wherein the preset reference opening is determined according to the cooking state.

5. The stove according to claim 4, characterized in that, When determining the proportional coefficient, integral coefficient, and derivative coefficient based on the temperature change rate, the controller is specifically configured as follows: Obtain the initial proportional coefficient, initial integral coefficient, and initial derivative coefficient; If the temperature change rate is greater than the fifth preset temperature change rate threshold, decrease the initial proportional coefficient to obtain the target proportional coefficient, use the initial integral coefficient as the target integral coefficient, increase the initial differential coefficient to obtain the target differential coefficient.

6. The stove according to claim 1, characterized in that, The controller is also configured to: When the detection result indicates that there is no human body in the predetermined area and the duration of no human body presence does not reach a preset time threshold, the opening of the proportional valve is controlled to gradually decrease to a preset minimum opening. When the detection result indicates that there is no human body in the predetermined area and the duration of the absence of human body reaches the preset time threshold, the proportional valve is controlled to close.

7. The stove according to claim 6, characterized in that, When the opening of the proportional valve is gradually reduced to a preset minimum opening, the controller is specifically configured as follows: Obtain user cooking preferences; If the user's cooking preference is an automatic protection preference, the opening of the proportional valve is gradually reduced to the preset minimum opening.

8. The stove according to claim 7, characterized in that, The controller is also configured to: If the detection results indicate that there is no human body in the predetermined area, the duration of no human presence has not reached the preset time threshold, and the user's cooking preference is remote notification preference, an unattended notification is sent to the user terminal. After receiving the user-specified opening degree returned by the user terminal, the opening degree of the proportional valve is gradually adjusted to the user-specified opening degree.

9. The stove according to claim 7, characterized in that, During the process of gradually reducing the opening of the proportional valve to the preset minimum opening, the controller is also configured to: If the cooking state is switched to the dry burning warning state, the opening of the proportional valve is adjusted by the following steps: obtaining the target temperature corresponding to the dry burning warning state, calculating the target opening of the proportional valve based on the cooking temperature, the target temperature and the temperature change rate, and controlling the opening of the proportional valve to adjust to the target opening to reduce the cooking heat. If the cooking state switches to the dry burning alarm state, the opening degree of the proportional valve is adjusted to the preset minimum opening degree.

10. A stove control method, characterized in that, include: Obtain test results and cooking temperature; The temperature change rate is calculated based on the cooking temperature, and the cooking state is identified based on the cooking temperature and the temperature change rate. When the detection result indicates the presence of a human body in a predetermined area around the stove and the cooking state is switched to a dry-burning warning state, the control alarm module issues a dry-burning warning message and adjusts the opening of the proportional valve through the following steps: obtaining the target temperature corresponding to the dry-burning warning state, calculating the target opening of the proportional valve based on the cooking temperature, the target temperature, and the temperature change rate, and controlling the opening of the proportional valve to adjust to the target opening to reduce the cooking heat, wherein, in the dry-burning warning state, the temperature change rate is greater than a first preset temperature change rate threshold and the cooking temperature is less than a first preset temperature threshold; When the cooking state is detected to switch to the dry burning alarm state, the opening of the proportional valve is adjusted to the preset minimum opening, and the alarm module is controlled to issue a dry burning alarm message. In the dry burning alarm state, the cooking temperature is greater than or equal to the first preset temperature threshold and the cooking temperature is less than the second preset temperature threshold. When the cooking state is detected to switch to the flameout protection state, the proportional valve is controlled to be completely closed, and the alarm module is controlled to issue a flameout protection notification. In the flameout protection state, the cooking temperature is greater than or equal to the second preset temperature threshold.

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