Heating control method of air fryer

Abstract

The invention discloses a heating control method of an air fryer, and relates to the technical field of cooking household appliances. The air fryer is provided with a shell and a cooking cavity formed in the shell, a main heating pipe and a main temperature controller are arranged at the top end of the interior of the cooking cavity, and an auxiliary heating pipe and an auxiliary temperature controller are arranged between the bottom end of the cooking cavity and the shell. The auxiliary heating pipe and the main heating pipe are controlled to be synchronously opened or closed; and when the second temperature detected by the auxiliary temperature controller is higher than the limited temperature or the working duration of the auxiliary heating pipe exceeds the preset working duration, the heating power of the auxiliary heating pipe is reduced. Therefore, the heating device has the advantages of balanced and stable heating for both the cold pot and the hot pot, good temperature rise centrality and capability of protecting the heating pipe from being damaged due to overheating.

Description

Technical Field

[0001] This application relates to the technical field of cooking appliances, and more particularly, to a heating control method for an air fryer. Background Art

[0002] Existing air fryers usually use a single heating tube in combination with a temperature controller to heat the food in the cooking cavity. If the heating tube and the temperature controller are arranged at the top of the cooking cavity, it is difficult to ensure sufficient heating of the bottom of the food when the air fryer grills the food; if the heating tube and the temperature controller are arranged at the bottom of the cooking cavity, when the air fryer grills the food, the temperature controller independent of the cooking cavity and located between the bottom wall of the cooking cavity and the bottom shell of the air fryer is difficult to accurately monitor the real-time temperature or temperature change in the cooking cavity, and its temperature sensing lags, thus unable to ensure accurate temperature control during the cooking process. Generally, the air fryers on the market are heated by a single heating tube and controlled by an upper temperature controller, without a lower heating function, which cannot meet the diverse cooking needs of users;

[0003] Some existing air fryers also use the method of jointly heating with upper and lower heating tubes to cook food. However, if the temperature controller is only arranged near one of the heating tubes, it is difficult to timely monitor the heating condition of the other heating tube, and it is easy to occur the problem that the temperature of the other heating tube is not monitored in time and finally overheats and is damaged; and for the method of independently controlling the heating of the upper and lower heating tubes with one-on-one temperature controllers respectively, the opening and closing periods of the two heating tubes will be out of sync, and centralized heating and joint temperature control cannot be achieved, thus resulting in problems such as uneven cooking heat on both sides of the food, low temperature control stability and cooking efficiency, and poor cooking quality. The prior art also discloses a scheme for controlling the compensation heating of the upper and lower heating tubes based on the IPD algorithm, but this scheme has high requirements for the chip computing power and has the defect of high cost.

[0004] From the above analysis, only setting an upper temperature controller to control the heating of the upper and lower heating tubes can ensure the coordinated heating of the upper and lower heating tubes. However, since there is no temperature control for the lower heating tube, it is easy to cause problems such as burning out the machine and overheating damage; although setting two temperature controllers separately to control the heating of the two heating tubes in the air fryer can solve the problem of burning out the machine, the non-coordinated upper and lower heating will affect the centralized temperature rise of the cooking cavity, and it is also easy to cause large temperature fluctuations in the cooking cavity and uneven upper and lower temperatures in the cooking cavity; the lower temperature controller measures the temperature only at the current position rather than the temperature at the bottom of the cooking cavity because the temperature measurement is not accurate enough. Since the temperature measured by the lower temperature controller easily reaches the temperature control threshold, the situation where the lower temperature controller controls the lower heating tube to turn off often occurs, resulting in insufficient heating at the bottom of the cooking cavity when cooking food in a hot pot.

[0005] Therefore, there is an urgent need in the prior art for an air fryer that can protect the heating tube from damage due to excessive temperature while meeting the requirements of balanced upper and lower heat and stable heating for food cooking, especially when heating a hot pot. Summary of the Invention

[0006] The purpose of this application is to provide a heating control method for an air fryer. By controlling the main heating tube to turn on or off through the main temperature controller and using the auxiliary temperature controller to limit the power of the auxiliary heating tube, it can effectively avoid the problem of premature shutdown of the auxiliary heating tube caused by inaccurate temperature measurement of the auxiliary temperature controller, and can effectively increase the on-time of the auxiliary heating tube. Therefore, this application has the advantages of improving the heating stability and reliability of the air fryer, and being able to evenly and centrally increase the temperature in the cooking cavity whether starting from a cold pot or a hot pot.

[0007] The embodiments of this application are implemented as follows:

[0008] In the first aspect of the embodiments of this application, a heating control method for an air fryer is provided. The air fryer has a housing and a cooking cavity provided inside the housing. A main heating tube and a main temperature controller are provided at the inner top of the cooking cavity, and an auxiliary heating tube and an auxiliary temperature controller are provided between the bottom end of the cooking cavity and the housing. The method includes: controlling the auxiliary heating tube and the main heating tube to turn on or off synchronously based on the target temperature and the first temperature detected by the main temperature controller; when the second temperature detected by the auxiliary temperature controller is higher than the temperature limit, or when the working duration of the auxiliary heating tube exceeds the preset working duration, reducing the heating power of the auxiliary heating tube.

[0009] In one embodiment, the air fryer has a preheating stage and a constant temperature stage. The temperature limit includes a preheating temperature limit and a constant temperature limit. The method further includes: in the preheating stage, the main heating tube and the auxiliary heating tube continuously heat synchronously until the first temperature reaches the temperature rise threshold corresponding to the target temperature, and reducing the heating power of the auxiliary heating tube when the second temperature is higher than the preheating temperature limit; in the constant temperature stage, the main heating tube and the auxiliary heating tube turn on synchronously when the first temperature is lower than the constant temperature threshold corresponding to the target temperature, and turn off synchronously when the first temperature is higher than the constant temperature threshold corresponding to the target temperature, and reducing the heating power of the auxiliary heating tube when the second temperature is higher than the constant temperature limit; the preheating temperature limit is lower than the constant temperature limit.

[0010] In one embodiment, the method further includes: in the preheating stage, reducing the heating power of the auxiliary heating tube according to the first ratio; in the constant temperature stage, reducing the heating power of the auxiliary heating tube according to the second ratio; the first ratio is greater than the second ratio.

[0011] In one embodiment, the method further includes: in the preheating stage, when the second temperature is lower than the preheating temperature limit, the auxiliary heating tube heats at the rated power; in the constant temperature stage, when the second temperature is lower than the constant temperature limit, the auxiliary heating tube heats at the heating power at the end of the preheating stage.

[0012] In one embodiment, a waiting-to-stabilize stage is further provided between the preheating stage and the constant-temperature stage. The method further includes: in the waiting-to-stabilize stage, the main heating tube and the auxiliary heating tube are synchronously turned off and maintained for a preset stable duration.

[0013] In one embodiment, the air fryer is further provided with a safety temperature higher than the temperature limit. The method further includes: when the second temperature reaches the safety temperature, the auxiliary heating tube is forcibly controlled to turn off.

[0014] In one embodiment, the air fryer is configured with a baking mode in which the food is placed on a suspended grill and a grilling mode in which the food is placed on the bottom surface of the cooking cavity. The method further includes: for the same target temperature, the average heating power of the main heating tube and / or the average heating power of the auxiliary heating tube corresponding to the baking mode and the grilling mode are different.

[0015] In one embodiment, for the same target temperature, the average heating power of the main heating tube in the baking mode is greater than that of the auxiliary heating tube, and the average heating power of the main heating tube in the grilling mode is less than that of the auxiliary heating tube.

[0016] In one embodiment, the difference between the temperature limit and the target temperature is not less than 60°C.

[0017] In one embodiment, the control method further includes: correcting the heating frequencies of the main heating tube and the auxiliary heating tube.

[0018] The beneficial effects of this application compared with the prior art are:

[0019] This application synchronously controls the main heating tube and the auxiliary heating tube to turn on or off through the first temperature detected by the main thermostat, and reduces the heating power of the auxiliary heating tube when the second temperature detected by the auxiliary thermostat exceeds the temperature limit or the working duration of the auxiliary heating tube exceeds the preset working duration, so as to achieve the synchronous control of the main heating tube and the auxiliary heating tube by the main thermostat, and timely slow down the heating rate of the auxiliary heating tube to avoid its premature shutdown or overheating damage, thereby achieving the effects of centralized heating of the cooking cavity and balanced and stable upper and lower heat during the heating process of the cooking cavity. This application is applicable to both cold-pot cooking and hot-pot cooking, effectively improving the cooking intelligence, cooking efficiency and cooking effect of the air fryer, and enhancing the user experience.

[0020] In addition, by dividing the cooking temperature increase process of the air fryer into multiple working stages and controlling the temperature increase separately, the present application improves the balance of the cooking cavity temperature increase; when the second temperature reaches the limit temperature corresponding to the current working stage in each working stage, the heating rate of the auxiliary heating tube is slowed down by reducing the heating power of the auxiliary heating tube at a preset ratio, so as to extend the heating duration of the upper and lower centralized heating and improve the stability and reliability of the temperature increase during the cooking process; the present application realizes overheat protection of the auxiliary heating tube by forcibly controlling the auxiliary heating tube to turn off when the second temperature reaches the safe temperature, and extends the service life of the air fryer; the present application achieves different cooking effects by setting different average heating powers for the frying mode and the baking mode, so as to improve the cooking quality; the present application also corrects the heating frequencies of the main heating tube and the auxiliary heating tube respectively based on the current working voltage, so that the working state of the air fryer is more adapted to the current voltage environment and the cooking quality of the air fryer is improved. Thus, the present application can effectively improve the cooking intelligence, stability and cooking quality of the food processor, and enhance the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required in the embodiments. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0022] Figure 1 Bottom side view schematic diagram of the air fryer provided by an embodiment of the present application;

[0023] Figure 2 Top side view schematic diagram of the air fryer provided by an embodiment of the present application;

[0024] Figure 3 Basket schematic diagram of the air fryer provided by an embodiment of the present application;

[0025] Figure 4 Flow schematic diagram of the heating control method provided by an embodiment of the present application;

[0026] Figure 5 Flow schematic diagram of the heating control method provided by an embodiment of the present application.

[0027] Reference numerals: 1 - air fryer; 2 - housing; 20 - accommodation space; 3 - basket; 30 - cooking cavity; 41 - main temperature controller; 42 - auxiliary temperature controller; 51 - main heating tube; 52 - auxiliary heating tube; 31 - grill. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0028] The technical solutions in the embodiments of the present application will be described below with reference to the accompanying drawings in the embodiments of the present application.

[0029] Similar reference numerals and letters denote similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, the terms "first", "second", etc. are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0030] The technical solutions of the present application will be clearly and completely described below with reference to the accompanying drawings.

[0031] Please refer to Figures 1 to 3 , the bottom side view schematic diagram of the air fryer 1 provided by an embodiment of the present application; Figure 2 is the top side view schematic diagram of the air fryer 1 provided by an embodiment of the present application; Figure 3 is the schematic diagram of the baking basket 3 of the air fryer 1 provided by an embodiment of the present application. As Figures 1 to 3 shown, the present application provides an air fryer 1, including a main control chip (not shown in the drawings), a housing 2, a baking basket 3, a main temperature controller 41 and a main heating tube 51, an auxiliary temperature controller 42 and an auxiliary heating tube 52.

[0032] Specifically, the housing 2 has a receiving space 20 for accommodating the baking basket 3. The baking basket 3 is slidable or detachable and is provided in the receiving space 20. The baking basket 3 has a cooking cavity 30. Among them, the main temperature controller 41 and the main heater are provided at the top end of the receiving space 20, and the auxiliary temperature controller 42 and the auxiliary heater are provided at the bottom end of the receiving space 20. That is, after the baking basket 3 is installed in the receiving space 20, the cooking cavity 30 is located inside the housing 2. The main heating tube 51 and the main temperature controller 41 are provided at the inner top end of the cooking cavity 30, and the auxiliary heating tube 52 and the auxiliary temperature controller 42 are provided between the bottom surface (bottom) of the cooking cavity 30 and the housing 2. The main control chip is provided in the housing 2 and is electrically connected to the main temperature controller 41 and the auxiliary temperature controller 42 to control the main heating tube 51 and the auxiliary heating tube 52 to be turned on or off based on the temperature detected by the main temperature controller 41 or the auxiliary temperature controller 42. The main control chip is configured to execute the heating control method of the air fryer 1 provided in any of the following embodiments.

[0033] In one embodiment, the air fryer 1 further includes a grill 31. The grill 31 is detachably suspended in the cooking cavity 30. The air fryer 1 is configured with a baking mode in which the food is placed on the suspended grill 31 and a grilling mode in which the food is placed on the bottom surface of the cooking cavity 30. The main control chip can control the food processor to enter the cooking heating operation corresponding to the baking mode or the grilling mode by detecting whether the grill 31 is in place or based on the cooking mode preselected by the user.

[0034] In one embodiment, the main thermostat 41 is disposed near the main heating tube 51, and the auxiliary thermostat 42 is disposed near the auxiliary heating tube 52. The main thermostat 41 has the function of simultaneously controlling the main heating tube 51 and the auxiliary heating tube 52 to be turned on or off, and the auxiliary thermostat 42 has the function of preferentially controlling the auxiliary heating tube 52 to be turned on or off. Optionally, the main thermostat 41 and the main heating tube 51 are located at the same horizontal position, and the main thermostat 41 is configured to detect the temperature in the cooking cavity 30. The auxiliary thermostat 42 is disposed adjacent to the auxiliary heating tube 52, and the auxiliary thermostat 42 is configured to detect the temperature at the position where the auxiliary heating tube 52 is located.

[0035] Please refer to Figure 4 , Figure 4 which is a schematic flow chart of a heating control method provided by an embodiment of the present application. The heating control method is applied to an air fryer. The air fryer can be the air fryer in the above embodiment of the present application, or any air fryer in the existing products that can implement the following heating control method. The heating control method is executed by a main control chip (or the air fryer). As Figure 4 shown, the heating control method of the air fryer includes the following steps S110 to S120.

[0036] S110: Based on the target temperature and the first temperature detected by the main thermostat, control the auxiliary heating tube and the main heating tube to be turned on or off synchronously.

[0037] The target temperature refers to the cooking temperature preset by the user on the operation interface of the air fryer, or the ideal temperature that the center of the cooking cavity needs to reach when the air fryer is stably heated in the no-load state. When the air fryer performs cooking work, the heating-up process is usually divided into at least two stages, such as a preheating stage and a constant-temperature stage. In the preheating stage, the air fryer quickly raises the actual temperature in the cooking cavity to near the target temperature based on the preheating temperature corresponding to the preheating stage. The preheating temperature is the temperature threshold set by the main thermostat for the preheating stage, which can be greater than or less than the target temperature according to the actual product parameters of the air fryer. In the constant-temperature stage, the air fryer stabilizes the actual temperature in the cooking cavity near the target temperature based on the constant-temperature temperature corresponding to the constant-temperature stage. The constant-temperature temperature is the temperature threshold set by the main thermostat for the constant-temperature stage, which can be greater than or less than the target temperature, or equal to the target temperature according to the actual product parameters of the air fryer. The constant-temperature temperature is closer to the target temperature than the preheating temperature.

[0038] The first temperature refers to the temperature detected by the main thermostat in real time. In this step, the air fryer determines the working state of the air fryer based on the known target temperature and the first temperature detected by the main thermostat in real time. For example, the air fryer determines the temperature thresholds at each working stage according to the known target temperature. When the first temperature reaches the temperature threshold, the air fryer ends the work of the current working stage and turns off the main heating tube and the auxiliary heating tube; or, when the first temperature does not reach the temperature threshold, the main control chip controls the main heating tube and the auxiliary heating tube to be turned off synchronously through the main thermostat to enter the next working stage, etc.

[0039] Based on the detected first temperature, the main thermostat synchronously controls the opening and closing of the main heating tube and the auxiliary heating tube, which can ensure that the upper and lower parts of the cooking cavity are heated simultaneously or stopped heating simultaneously, thereby ensuring that the upper and lower heat is balanced when the air fryer cooks food materials, and the heating temperature of the entire cooking cavity is highly consistent.

[0040] S120: When the second temperature detected by the auxiliary thermostat is higher than the temperature limit, or the working duration of the auxiliary heating tube exceeds the preset working duration, reduce the heating power of the auxiliary heating tube.

[0041] The temperature limit refers to: for the auxiliary heating tube, in order to prevent it from heating up too fast or having too high a temperature, resulting in overheating damage or premature shutdown, the temperature control threshold of the auxiliary thermostat is correspondingly set. The working duration of the auxiliary heating tube refers to the duration that the auxiliary heating tube maintains heat after being turned on. In this step, during the process that the main thermostat synchronously controls the opening and closing of the main heating tube and the auxiliary heating tube according to the detected first temperature, the auxiliary thermostat can preferentially control the opening or closing of the auxiliary heating tube based on the detected second temperature, and can also preferentially adjust the heating power of the auxiliary heating tube. When the second temperature detected by the auxiliary thermostat is higher than the temperature limit, or the working duration of the auxiliary heating tube exceeds the preset working duration, the auxiliary heating tube has a tendency or possibility of premature shutdown or overheating damage. To try to maintain the coordinated heating of the main heating tube and the auxiliary heating tube, make the upper and lower heat in the cooking cavity balanced and extend the time of concentrated heating, the main control chip controls the auxiliary thermostat to reduce the heating power of the auxiliary heating tube.

[0042] Optionally, the preset working duration is 3s, and the value of the preset working duration can also be set to other values according to the target temperature and the product parameters of the air fryer.

[0043] In one embodiment, the difference between the temperature limit and the target temperature is not less than 60°C, so as to ensure that the auxiliary heating tube can maintain heat for a longer time, make the cooking cavity receive concentrated heating for a longer time and the upper and lower heat is more balanced, and the auxiliary heating tube will not be turned off or burned prematurely due to too fast heating.

[0044] The present application synchronously controls the main heating tube and the auxiliary heating tube to be turned on or off through the first temperature detected by the main thermostat, and reduces the heating power of the auxiliary heating tube when the second temperature detected by the auxiliary thermostat exceeds the temperature limit or when the working duration of the auxiliary heating tube exceeds the preset working duration. In this way, the main thermostat realizes the synchronous control of the main heating tube and the auxiliary heating tube, and timely slows down the heating rate of the auxiliary heating tube to avoid its premature shutdown or overheating damage, thereby achieving the effects of centralized heating of the cooking cavity, balanced upper and lower heat, and stability during the heating process of the cooking cavity. In addition, the present application is applicable to both cold-pot cooking and hot-pot cooking, which can effectively improve the cooking intelligence and stability of the air fryer, improve the cooking efficiency and cooking effect, and enhance the user experience.

[0045] On the basis of the above method embodiments, the air fryer can also control the heat generation of the main heating tube and the auxiliary heating tube in multiple aspects. For example, for the entire cooking process, the air fryer divides it into multiple working stages to control the heating power of the main heating tube and the auxiliary heating tube or control the on / off of the main heating tube and the auxiliary heating tube in different heating stages respectively; the air fryer can preset a safety temperature to timely control the auxiliary heating tube to turn off when the temperature of the auxiliary heating tube is too high; the air fryer can also adopt different average heating powers for different cooking modes; the air fryer can also correct the heating frequency based on the current working voltage and the standard working voltage. For specific details, please refer to the following embodiments.

[0046] (1) Divide the entire cooking process into multiple working stages to achieve stable heating and balanced heating during the cooking process.

[0047] Please refer to Figure 5 , Figure 5 which is a schematic flowchart of the heating control method provided by an embodiment of the present application. The heating control method is applied to an air fryer. The air fryer can be the air fryer in the above embodiments of the present application, or any air fryer in existing products that can implement the following heating control method. The heating control method is executed by a main control chip (or the air fryer). When the air fryer performs cooking work, it has a preheating stage, a waiting-for-stabilization stage, and a constant-temperature stage. As Figure 5 shown, the heating control method of the air fryer includes the following steps S210 to S230.

[0048] S210: In the preheating stage, the main heating tube and the auxiliary heating tube are heated continuously and synchronously until the first temperature reaches the heating threshold corresponding to the target temperature. When the second temperature is higher than the preheating temperature limit, the heating power of the auxiliary heating tube is reduced.

[0049] The preheating stage refers to the process in which the air fryer quickly raises the temperature in the cooking cavity to near the target temperature when it initially enters the cooking operation. The heating threshold corresponding to the target temperature refers to the preheating threshold set for the preheating stage of the air fryer. Based on the product structure and product parameters of the air fryer, this preheating threshold can be set to be greater than or less than the target temperature, or can be set to be equal to the target temperature.

[0050] In this step, regarding the synchronous control of the main heating tube and the auxiliary heating tube by the main temperature controller, in the preheating stage, when the first temperature detected by the main temperature controller reaches the heating threshold, the air fryer should end the preheating stage and synchronously turn off the main heating tube and the auxiliary heating tube; when the first temperature detected by the main temperature controller does not reach the heating threshold, the air fryer continues to control the main heating tube and the auxiliary heating tube to generate heat to continue raising the ambient temperature in the cooking cavity until the first temperature detected by the main temperature controller reaches the heating threshold.

[0051] In this step, regarding the priority control of the auxiliary heating tube by the auxiliary temperature controller, in the preheating stage, when the second temperature detected by the auxiliary temperature controller is lower than the preheating limit temperature, the auxiliary heating tube heats at the rated power; when the second temperature detected by the auxiliary temperature controller is higher than the preheating limit temperature, the auxiliary temperature controller reduces the heating power of the auxiliary heating tube to slow down its heating rate and avoid overheating and damage of the auxiliary heating tube or quickly reaching the shutdown temperature. When the second temperature is higher than the preheating limit temperature, reducing the heating power of the auxiliary heating tube can maintain concentrated heating in the cooking cavity for a longer time, and the heat supply from top to bottom is balanced, improving the cooking efficiency and cooking quality of the air fryer. In an embodiment, the difference between the preheating limit temperature and the target temperature is not less than 60°C. In the preheating stage, when the second temperature is higher than the preheating limit temperature, the auxiliary temperature controller reduces the heating power of the auxiliary heating tube according to the first ratio.

[0052] In an embodiment, in the preheating stage, when the working duration of the auxiliary heating tube exceeds the preset working duration, there is a tendency or possibility that the auxiliary heating tube will be turned off in advance or damaged by overheating. To maintain the coordinated heating of the main heating tube and the auxiliary heating tube as much as possible, make the upper and lower heat in the cooking cavity balanced and extend the time of concentrated heating, the main control chip controls the auxiliary temperature controller to reduce the heating power of the auxiliary heating tube. Optionally, the preset working duration is 3s, and the value of the preset working duration can also be set to other values according to the target temperature and the product parameters of the air fryer.

[0053] S220: In the waiting for stabilization stage, synchronously turn off the main heating tube and the auxiliary heating tube and maintain the preset stabilization duration.

[0054] The waiting-to-stabilize stage refers to the process after the air fryer finishes the preheating stage, during which the environmental temperature in the cooking cavity changes from large fluctuations to smaller fluctuations and gradually drops to near the target temperature. In this step, when the air fryer enters the waiting-to-stabilize stage after finishing the preheating stage, the main heating tube and the auxiliary heating tube are synchronously turned off. Due to the unstable thermal field in the cooking cavity, the environmental temperature continues to rise above the target temperature after reaching the temperature increase threshold, and then gradually drops from the highest point to near the target temperature with the cooling rate gradually decreasing. The main heating tube and the auxiliary heating tube maintain the off state according to the preset stabilization duration, which can ensure that the environmental temperature in the cooking cavity drops to near the target temperature and changes relatively stably.

[0055] Optionally, the preset stabilization duration is 15s, and the value of the preset stabilization duration can also be set to other values according to the target temperature and the product parameters of the air fryer.

[0056] S230: In the constant-temperature stage, the main heating tube and the auxiliary heating tube are synchronously turned on when the first temperature is lower than the constant-temperature threshold corresponding to the target temperature, and synchronously turned off when the first temperature is higher than the constant-temperature threshold corresponding to the target temperature. When the second temperature is higher than the constant-temperature limit temperature, the heating power of the auxiliary heating tube is reduced.

[0057] The constant-temperature stage refers to the process in which the air fryer stably maintains the environmental temperature in the cooking cavity at or near the target temperature. The constant-temperature threshold corresponding to the target temperature refers to the threshold set by the air fryer for the constant-temperature stage. Based on the product structure and product parameters of the air fryer, this constant-temperature threshold can be set to be greater than or less than the target temperature, or equal to the target temperature.

[0058] In this step, for the synchronous control of the main heating tube and the auxiliary heating tube by the main thermostat, in the constant-temperature stage, when the first temperature detected by the main thermostat exceeds the constant-temperature threshold, the air fryer should synchronously turn off the main heating tube and the auxiliary heating tube; when the first temperature detected by the main thermostat does not exceed the constant-temperature threshold, the air fryer continues to control the main heating tube and the auxiliary heating tube to generate heat to continue raising the environmental temperature in the cooking cavity until the first temperature detected by the main thermostat exceeds the constant-temperature threshold.

[0059] In one embodiment, the constant-temperature threshold includes a first constant-temperature threshold and a second constant-temperature threshold, and the first constant-temperature threshold is less than the second constant-temperature threshold. In the constant-temperature stage, the main heating tube and the auxiliary heating tube are synchronously turned on when the first temperature drops below the first constant-temperature threshold, and the main heating tube and the auxiliary heating tube are synchronously turned off when the first temperature rises above the second constant-temperature threshold.

[0060] In this step, for the priority control of the auxiliary heating pipe by the auxiliary thermostat, in the constant temperature stage, when the second temperature detected by the auxiliary thermostat does not reach the constant temperature limit temperature, the auxiliary heating pipe heats at the heating power at the end of the preheating stage; when the second temperature detected by the auxiliary thermostat is higher than the constant temperature limit temperature, the auxiliary thermostat reduces the heating power of the auxiliary heating pipe to slow down its heating rate and avoid overheating damage or quickly reaching the shutdown temperature of the auxiliary heating pipe. When the second temperature is higher than the constant temperature limit temperature, reducing the heating power of the auxiliary heating pipe can maintain concentrated heating in the cooking cavity for a longer time, with balanced heat supply up and down, improving the cooking efficiency and quality of the air fryer. In an embodiment, in the constant temperature stage, when the second temperature is higher than the constant temperature limit temperature, the auxiliary thermostat reduces the heating power of the auxiliary heating pipe according to the second ratio. Among them, the preheating limit temperature is lower than the constant temperature limit temperature. In an embodiment, the first ratio is greater than the second ratio.

[0061] The ambient temperature in the cooking cavity rises rapidly in the heating-up stage and is basically stable and balanced in the constant temperature stage. If only a single limit temperature is used for the two heating stages, too low a limit temperature will lead to a reduction in the heating efficiency of the air fryer, and too high a limit temperature will easily cause the problem of overshoot. Therefore, for the preheating stage and the constant temperature stage in which the main heating pipe and the auxiliary heating pipe can be turned on simultaneously, the preheating limit temperature and the constant temperature limit temperature are set respectively to adapt to the temperature changes in different heating stages. And the first ratio is greater than the second ratio to make the fluctuation of the ambient temperature in the cooking cavity smaller in the constant temperature stage. Too large a change in the heating power is likely to cause too large a fluctuation in the constant temperature, and a small reduction in the heating power can effectively avoid unstable heating of the air fryer. The auxiliary heating pipe generates heat at the heating power at the end of the heating-up stage in the constant temperature stage, which can make the temperature amplitude fluctuation of the ambient temperature in the cooking cavity smaller and improve the heating stability of the air fryer.

[0062] Based on the above solution, the present application can improve the balance and stability of the upper and lower heat in the cooking cavity when the air fryer performs cooking work, and make the temperature at the bottom of the food as consistent as possible with the temperature at the center of the cooking cavity; by dividing the cooking process into multiple stages and dynamically adjusting the heating power of the auxiliary heating pipe based on the second temperature detected by the auxiliary thermostat in each stage, the present application can avoid uneven heat when the air fryer starts from cold, resulting in overheating of the auxiliary heating pipe and damaging the equipment, and can also make up for the defect that the air fryer cannot accurately limit the temperature rise of the auxiliary heating pipe when starting from hot; the present application can achieve overheat protection of the auxiliary heating pipe and appropriately slow down the heating rate of the auxiliary heating pipe to improve the heating concentration and heating efficiency of the air fryer, extend the service life of the air fryer, and improve the cooking quality.

[0063] In the embodiments of the present application, the air fryer can determine parameters such as the temperature control thresholds (such as the temperature rise threshold and the constant temperature threshold), the temperature limit (the preheating temperature limit and the constant temperature limit), the safety temperature, and the heating ratio (heating power) corresponding to the target temperature in each heating stage based on different target temperatures, so that the air fryer can achieve stable and balanced heating and efficient heating based on each preset target temperature.

[0064] (2) Set the safety temperature and timely control the auxiliary heating tube to turn off.

[0065] In one embodiment, the air fryer is also provided with a safety temperature higher than the temperature limit. The heating control method of the air fryer further includes: in each working stage of the air fryer, when the second temperature detected by the auxiliary temperature controller reaches the safety temperature, forcibly control the auxiliary heating tube to turn off; or, when the second temperature detected by the auxiliary temperature controller drops below the safety temperature, restore the heatable state of the auxiliary heating tube.

[0066] Based on the above solution, the air fryer sets a safety temperature for the heat generation of the auxiliary heating tube, which can timely avoid the temperature out of control of the auxiliary heating tube and excessive temperature rise, thereby causing damage to the machine. The above solution can effectively protect the auxiliary heating tube and the auxiliary temperature controller and extend the service life of the air fryer.

[0067] (3) Adopt different average heating powers for different cooking modes.

[0068] In one embodiment, the air fryer is configured with a baking mode in which the food is placed on a suspended grill and a grilling mode in which the food is placed on the bottom surface of the cooking cavity. The heating control method of the air fryer further includes: for the same target temperature, the average heating power of the main heating tube and / or the average heating power of the auxiliary heating tube corresponding to the baking mode and the grilling mode are different.

[0069] Specifically, for the same target temperature, the average heating power of the main heating tube in the baking mode is greater than the average heating power of the auxiliary heating tube, and the average heating power of the main heating tube in the grilling mode is less than the average heating power of the auxiliary heating tube.

[0070] Regarding the distinction between the baking mode and the grilling mode, if the food is placed on a suspended grill, while the heat emitted by the main heating tube can be received above the food, due to the action of the fan blades, the heat in the air in the cooking cavity can also be received below the food. At this time, it is in the baking state, and the main heating tube should provide more heat; if the suspended grill is not placed and the food directly contacts the bottom surface of the cooking cavity, the heat emitted by the auxiliary heating tube can produce a grilling-like effect on the lower surface of the food. At this time, it is in the grilling state, and the auxiliary heating tube should provide more heat, and / or the heating duration of the auxiliary heating tube should be increased to ensure a good grilling effect.

[0071] For the baking mode and the grilling mode, the distances between the main and auxiliary heating tubes and the food are different. Therefore, the average heating powers of the main heating tube and / or the auxiliary heating tube are different at the same target temperature. The air fryer can change the temperature control points and heating ratios of the main thermostat and / or the auxiliary thermostat in the baking mode and the grilling mode according to the target temperature and the actual product parameters to achieve better cooking effects.

[0072] (4) Based on the current working voltage and the standard working voltage, correct the heating frequencies of the main heating tube and the auxiliary heating tube respectively.

[0073] In one embodiment, the heating control method of the air fryer further includes: correcting the heating frequencies of the main heating tube and the auxiliary heating tube. Specifically, the main control chip calculates the respective corrected heating frequencies of the main heating tube and the auxiliary heating tube according to the current heating frequency of the main heating tube, the current heating frequency of the auxiliary heating tube, the current working voltage and the standard working voltage, and calculates from the current heating power to the corrected heating power. The calculation method is specifically shown in the following formulas (1)-(2).

[0074] A1 = ((220 * 220) / (U * U)) × A0; (1)

[0075] B1 = ((220 * 220) / (U * U)) × B0; (1)

[0076] Wherein, A1 is the corrected heating frequency corresponding to the main heating tube, with the unit of Hz; A0 is the current heating frequency of the main heating tube, with the unit of Hz; B1 is the corrected heating frequency corresponding to the auxiliary heating tube, with the unit of Hz; B0 is the current heating frequency of the auxiliary heating tube, with the unit of Hz; U is the current working voltage, with the unit of V; the standard working voltage is 220V.

[0077] In one embodiment, if A1 or B1 exceeds the heating frequency threshold, the main control chip sets the corrected heating frequency corresponding to the main heating tube or the auxiliary heating tube to the heating frequency threshold.

[0078] Based on the above solution, the air fryer adjusts the heating frequency based on the current working voltage through a constant power heating algorithm, so that the heating power output by the whole air fryer is maintained within a constant range, avoiding the adverse effects of high-voltage fluctuations or low-voltage fluctuations on the cooking effect.

[0079] In summary, in the present application, by dividing the cooking temperature rising process of the air fryer into multiple working stages for separate temperature control and rising, the balance of the cooking cavity temperature rising is improved; when the second temperature reaches the limiting temperature corresponding to the current working stage within each working stage, by reducing the heating power of the auxiliary heating tube at a preset ratio, the temperature rising speed of the auxiliary heating tube is slowed down, so as to extend the heating duration of the upper and lower concentrated heating and improve the stability and reliability of the temperature rising during the cooking process; in the present application, by forcibly controlling the auxiliary heating tube to turn off when the second temperature reaches the safety temperature, overheat protection of the auxiliary heating tube is achieved, and the service life of the air fryer is extended; in the present application, different average heating powers are set for the frying mode and the baking mode to achieve different cooking effects, so as to improve the cooking quality; in the present application, the heating frequencies of the main heating tube and the auxiliary heating tube are respectively corrected based on the current working voltage, so that the working state of the air fryer is more adapted to the current voltage environment, and the heating power output by the whole air fryer is maintained within a constant range to ensure the cooking quality of the air fryer. Thus, the present application can effectively improve the cooking intelligence, stability and cooking quality of the food processor, and enhance the user experience.

[0080] The methods disclosed in several embodiments provided in the present application can also be implemented in other ways. The method embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions and operations of devices, methods and computer program products according to multiple embodiments of the present application. In this regard, each block in the flowchart or block diagram may represent a module, a program segment, or a part of code, and the module, the program segment, or the part of code contains one or more executable instructions for implementing the specified logical function. In some alternative implementations, the functions marked in the blocks may occur in a different order from that marked in the accompanying drawings. For example, two consecutive blocks may actually be executed substantially in parallel, and they may sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system for performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0081] In addition, in each embodiment of the present application, the various modules may be integrated together to form an independent part, or each module may exist alone, or two or more modules may be integrated to form an independent part.

[0082] The embodiment of the present application provides a computer-readable storage medium, and the storage medium stores a computer program. The computer program can be executed by the main control chip to complete the heating control method of the air fryer.

[0083] If a function is implemented in the form of a software functional module and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art or a part of this technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods in various embodiments of this application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0084] The foregoing are only the preferred embodiments of this application and are not used to limit this application. For those skilled in the art, this application can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of this application shall be included within the protection scope of this application.

Claims

1. A heating control method for an air fryer, characterized in that, The air fryer has a housing and a cooking cavity provided inside the housing. A main heating tube and a main temperature controller are provided at the inner top of the cooking cavity. An auxiliary heating tube and an auxiliary temperature controller are provided between the bottom end of the cooking cavity and the housing. The method includes: Based on the target temperature and the first temperature detected by the main temperature controller, controlling the auxiliary heating tube and the main heating tube to be turned on or off synchronously; When the second temperature detected by the auxiliary temperature controller is higher than the temperature limit, or the working duration of the auxiliary heating tube exceeds the preset working duration, reducing the heating power of the auxiliary heating tube.

2. The heating control method of the air fryer according to claim 1, characterized in that, The air fryer has a preheating stage and a constant temperature stage. The temperature limit includes a preheating temperature limit and a constant temperature limit. The method further includes: In the preheating stage, the main heating tube and the auxiliary heating tube continuously heat synchronously until the first temperature reaches the temperature rise threshold corresponding to the target temperature. When the second temperature is higher than the preheating temperature limit, reducing the heating power of the auxiliary heating tube; In the constant temperature stage, the main heating tube and the auxiliary heating tube are turned on synchronously when the first temperature is lower than the constant temperature threshold corresponding to the target temperature, and are turned off synchronously when the first temperature is higher than the constant temperature threshold corresponding to the target temperature. When the second temperature is higher than the constant temperature limit, reducing the heating power of the auxiliary heating tube; The preheating temperature limit is lower than the constant temperature limit.

3. The heating control method of the air fryer according to claim 2, wherein, The method further includes: In the preheating stage, reducing the heating power of the auxiliary heating tube according to a first ratio; In the constant temperature stage, reducing the heating power of the auxiliary heating tube according to a second ratio; The first ratio is greater than the second ratio.

4. The heating control method of the air fryer according to claim 2, wherein The method further includes: In the preheating stage, when the second temperature is lower than the preheating temperature limit, the auxiliary heating tube heats at the rated power; In the constant temperature stage, when the second temperature is lower than the constant temperature limit, the auxiliary heating tube heats at the heating power at the end of the preheating stage.

5. The heating control method of the air fryer according to claim 2, wherein A waiting-to-stabilize stage is also set between the preheating stage and the constant temperature stage. The method further includes: In the waiting-to-stabilize stage, the main heating tube and the auxiliary heating tube are turned off synchronously and maintained for a preset stabilization duration.

6. The heating control method of the air fryer according to claim 1, characterized in that, The air fryer is also provided with a safety temperature higher than the temperature limit. The method further includes: When the second temperature reaches the safety temperature, forcibly controlling the auxiliary heating tube to turn off.

7. The heating control method of the air fryer according to claim 1, characterized in that, The air fryer is configured with a baking mode in which the food is placed on a suspended grill and a grilling mode in which the food is placed on the bottom surface of the cooking cavity. The method further includes: For the same target temperature, the average heating power of the main heating tube and / or the average heating power of the auxiliary heating tube corresponding to the baking mode and the grilling mode are different.

8. The heating control method of the air fryer according to claim 7, characterized in that, For the same target temperature, the average heating power of the main heating tube in the baking mode is greater than the average heating power of the auxiliary heating tube, and the average heating power of the main heating tube in the grilling mode is less than the average heating power of the auxiliary heating tube.

9. The heating control method of the air fryer according to claim 1, characterized in that, The difference between the temperature limit and the target temperature is not less than 60 °C.

10. The heating control method of the air fryer according to claim 1, wherein, The control method further includes: Calibrating the heating frequencies of the main heating tube and the auxiliary heating tube.

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