Control method and stepless speed control method for air fryer and system and device thereof

Abstract

A control method and a stepless speed control method for an air fryer, and a system and device thereof. The control method for an air fryer comprises the steps of: controlling an air circulation device of the air fryer to drive air to flow in an air frying cavity of the air fryer; controlling an air heating device of the air fryer to heat the air flowing in the air frying cavity; and selectively adjusting the flow speed of the air in the air frying cavity according to the material of the object to be fried contained in the air frying cavity, so that the flow speed of the air matches the object to be fried, so as to improve the air frying effect.

Description

Technical Field

[0001] The present invention relates to the technical field of air frying, and more specifically to a control method and a stepless speed control method for an air fryer, and a system and equipment thereof. Background Art

[0002] As a machine that can use hot air to "fry", the air fryer mainly uses hot air to replace the hot oil in the original frying pan to heat the items (such as French fries, vegetables, meat or fish, etc.), and removes the moisture on the surface of the items through the hot air to achieve the frying effect. Since the air fryer can not only greatly eliminate the grease in the items, but also maintain many required qualities of fried items (such as the appearance and taste of fried food), the air fryer has attracted more and more attention and love from users, and has great commercial value.

[0003] Existing air fryers generally include a housing, an electric heater and a fan disposed in the housing, a frying basket that can be placed in the housing, and a controller for controlling the electric heater and the fan. When the frying basket containing the items to be fried is placed in the housing, the controller can control the electric heater to be turned on to heat the air in the housing to form hot air; and the controller can control the fan to be turned on to blow the hot air to circulate in the frying basket to air fry the items to be fried.

[0004] In the actual use of the existing air fryer, first, after the existing air fryer is turned on, the controller will first control the electric heater to start running to release heat and heat the air, and at the same time, the controller will also control the fan motor to start blowing air, so that the air temperature in the shell gradually increases. Then, when the air temperature in the shell approaches the upper limit of the target temperature, the controller will control the electric heater to stop running. At this time, part of the heat in the shell will be absorbed by the fried object, and another part of the heat in the shell will be quickly dissipated due to the fanning of the fan, so that the air temperature in the shell will drop rapidly. Afterwards, when the air temperature in the shell drops to the lower limit close to the target temperature, the controller will control the electric heater to start running again to heat the air again, and repeat the control in this way, so that the air temperature in the shell fluctuates around the target temperature. Finally, after the existing air fryer is turned on for a period of time, the controller controls both the electric heater and the fan to stop running to end the air frying process.

[0005] However, due to the heating characteristics of the electric heater and the fact that the fan runs at full speed at the same speed during the entire air frying process, it takes a long time to heat the air temperature in the shell to the target temperature after the existing air fryer is turned on, resulting in poor air frying efficiency and quality of the existing air fryer, and even seriously affecting the air frying effect of the fried items. At the same time, after the air in the shell is heated to a temperature close to the target temperature, the existing air fryer will lose a large amount of heat because the fan is still running at full speed, so that the electric heater has to be turned on frequently to supplement the heat, which not only causes a large amount of heat to be wasted, but also aggravates the fluctuation of the air temperature in the shell, affecting the air frying effect of the fried items, such as the appearance and taste of the fried food.

[0006] In addition, since the surface water content and fat content of different ingredients (such as French fries, chicken, steak, pork chops or fish and shrimp, etc.) are different, the amount of dehydration and defatting required during the air frying process is also different, and the air flow rate in the shell directly determines the surface dehydration and defatting speed of the ingredients. Therefore, when the existing air fryer is used to air fry different ingredients, the ingredients with less surface water content or fat content will become hard, dry, or even astringent due to excessive dehydration or defatting, while the ingredients with more surface water content or fat content will become soft and damp due to too little dehydration or defatting, and a good air frying effect cannot be achieved, resulting in different ingredients having different tastes after air frying in the existing air fryer. Summary of the invention

[0007] An advantage of the present invention is that it provides a control method and a stepless speed control method for an air fryer and a system and device thereof, which can regulate the flow rate of air in the air fryer and help improve the air frying effect of the air fryer.

[0008] Another advantage of the present invention is to provide a control method and a stepless speed control method for an air fryer and a system and equipment thereof. In one embodiment of the present invention, the control method for an air fryer can select the flow rate of air in the air fryer according to the material of the item to be fried, so as to reasonably control the dehydration effect and degreasing effect of the item to be fried, thereby improving the air frying effect of the item to be fried.

[0009] Another advantage of the present invention is that it provides a control method and a stepless speed control method for an air fryer and a system and equipment thereof. In one embodiment of the present invention, the control method for an air fryer can select different air flow speeds according to different ingredients, so that the dehydration effect and the degreasing effect match the corresponding ingredients, so as to better improve the air frying effect and taste.

[0010] Another advantage of the present invention is that it provides a control method and a stepless speed control method for an air fryer, and a system and equipment thereof. In one embodiment of the present invention, the control method for an air fryer can adjust the flow rate of air in the air fryer according to different stages of the air frying process, so as to control the temperature of the air in the air fryer and improve the air frying effect.

[0011] Another advantage of the present invention is to provide a control method and a stepless speed control method for an air fryer and a system and equipment thereof, wherein, in one embodiment of the present invention, the stepless speed control method can control the driving power of the air circulation device of the air fryer through pulse waves so as to steplessly control the air flow rate in the air fryer.

[0012] Another advantage of the present invention is to provide a control method and a stepless speed control method for an air fryer, and a system and equipment thereof. In one embodiment of the present invention, the stepless speed control method can control the fan of the air circulation device to frequently switch between a high-speed operating state and a low-speed operating state through the high level and low level of the pulse wave, thereby accurately controlling the driving power of the air circulation device.

[0013] Another advantage of the present invention is to provide a control method and a stepless speed control method for an air fryer and a system and device thereof, wherein, in one embodiment of the present invention, the stepless speed control method can continuously adjust the driving power of the air circulation device by modulating the duty cycle of the pulse wave so as to steplessly adjust the air flow rate in the air fryer.

[0014] Another advantage of the present invention is that it provides a control method and a stepless speed control method for an air fryer, and a system and equipment thereof. In one embodiment of the present invention, the stepless speed control method can change the power frequency by modulating the frequency of the pulse wave to continuously adjust the fan speed, thereby achieving the desired stepless speed regulation effect.

[0015] Another advantage of the present invention is that it provides a control method and a stepless speed control method for an air fryer and a system and equipment thereof. In one embodiment of the present invention, the air fryer can provide a dry and low-temperature environment for the motor of the fan, which helps to extend the service life of the fan.

[0016] Another object of the present invention is to provide a control method and a stepless speed control method for an air fryer and a system and device thereof, wherein, in order to achieve the above-mentioned object, no complex structure or algorithm is required in the present invention. Therefore, the present invention successfully and effectively provides a solution, not only providing a simple control method and a stepless speed control method for an air fryer and a system and device thereof, but also increasing the practicality and reliability of the control method and a stepless speed control method for an air fryer and a system and device thereof.

[0017] In order to achieve at least one of the above-mentioned invention objects or other objects and advantages, the present invention provides a control method for an air fryer, comprising the steps of:

[0018] Controlling an air circulation device of the air fryer to drive air to flow in an air frying cavity of the air fryer;

[0019] controlling an air heating device of the air fryer to heat the air flowing in the air frying cavity; and

[0020] According to the material of the object to be fried contained in the air frying cavity, the flow speed of the air in the air frying cavity is selectively adjusted so that the flow speed of the air matches the object to be fried.

[0021] According to one embodiment of the present application, according to the water content and / or fat content of the object to be fried, the working threshold of the driving power of the air circulation device is selectively adjusted so that the maximum flow rate of the air in the air frying cavity is positively correlated with the water content and / or the fat content of the object to be fried.

[0022] According to an embodiment of the present application, the step of selectively adjusting the flow rate of the air in the air frying cavity according to the material of the object to be fried contained in the air frying cavity so that the flow rate of the air matches the object to be fried comprises the steps of:

[0023] Identify the material of the object to be blasted to obtain a material identification result;

[0024] Calling a preset threshold instruction corresponding to the material recognition result from the instruction list; and

[0025] In response to the preset threshold instruction, the working threshold of the driving power of the air circulation device is adjusted to be equal to a preset threshold, so that the real-time speed of the air flowing in the air frying cavity is not greater than the maximum flow speed.

[0026] According to an embodiment of the present application, the operating threshold of the driving power of the air circulation device is regulated by modulating the parameters of a stepless control signal within a parameter modulation range.

[0027] According to an embodiment of the present application, the control method for an air fryer further comprises the steps of:

[0028] According to the working stage of the air fryer, the flow speed of the air in the air frying cavity is controlled by a stepless speed control method, wherein the stepless speed control method comprises the steps of:

[0029] According to the working stage of the air fryer, modulate the parameters of a stepless control signal; and

[0030] In response to the modulated stepless control signal, the driving power of the air circulation device is steplessly adjusted to control the flow speed of the air in the air frying cavity.

[0031] According to an embodiment of the present application, the control method for an air fryer further comprises the steps of:

[0032] According to the material of the object to be fried contained in the air frying cavity, the maximum temperature of the air in the air frying cavity is selectively adjusted so that the maximum temperature of the air matches the object to be fried.

[0033] According to another aspect of the present application, an embodiment of the present application further provides a stepless speed control method, comprising the steps of:

[0034] S100: modulating a parameter of a stepless control signal according to a working stage of an air fryer; and

[0035] S200: In response to the modulated stepless control signal, steplessly adjust the driving power of an air circulation device of the air fryer to control the flow rate of air in an air frying cavity of the air fryer.

[0036] According to an embodiment of the present application, the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes a duty cycle of the pulse wave.

[0037] According to an embodiment of the present application, step S200 includes the following steps:

[0038] In response to the high level of the pulse wave, a power supply circuit of the air circulation device is instantly turned on through a switch device of the air circulation device, so that a current working voltage of a fan of the air circulation device is equal to the real-time voltage applied to the fan through the power supply circuit, so that the fan is in a high-speed operation state; and

[0039] In response to the low level of the pulse wave, the power supply circuit is instantly disconnected through the switch device, so that the current working voltage of the fan is equal to zero, so that the fan is in a low-speed operation state.

[0040] According to an embodiment of the present application, step S100 includes the following steps:

[0041] In response to the air fryer being in a preheating stage, adjusting the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device can be adjusted to zero power;

[0042] In response to the air fryer being in a primary heating stage, increasing the duty cycle of the pulse wave so that the driving power of the air circulation device can be increased steplessly;

[0043] In response to the air fryer being in a constant temperature heating stage, modulating the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device; and

[0044] In response to the air fryer being in a cooling stage, the duty cycle of the pulse wave is adjusted to 1, so that the driving power of the air circulation device can be adjusted to full power.

[0045] According to an embodiment of the present application, in response to the air fryer being in a primary heating stage, the step of increasing the duty cycle of the pulse wave so that the driving power of the air circulation device can be steplessly increased comprises the steps of:

[0046] In response to the air fryer being in a rapid temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to a preset low threshold value, so that the driving power of the air circulation device can be adjusted to low power; and

[0047] In response to the air fryer being in a uniform temperature rise stage of the primary heating stage, the duty cycle of the pulse wave is adjusted to 1, so that the driving power of the air circulation device can be adjusted to the full power.

[0048] According to an embodiment of the present application, in the step of modulating the duty cycle of the pulse wave in response to the air fryer being in a constant temperature heating stage to steplessly adjust the driving power of the air circulation device:

[0049] In response to the air fryer being in the constant temperature heating stage, the duty cycle of the pulse wave is adjusted to a preset high threshold value to adjust the driving power of the air circulation device to a high power, so that the heat dissipation power of the air fryer is equal to the heating power of an air heating device of the air fryer.

[0050] According to an embodiment of the present application, in response to the air fryer being in a constant temperature heating stage, the step of modulating the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device comprises the steps of:

[0051] In response to the air fryer being in the constant temperature heating stage, analyzing the temperature of the air flowing in the air frying cavity detected in real time to obtain a temperature change of the air flowing in the air frying cavity;

[0052] In response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, increasing the duty cycle of the pulse ratio so that the driving power of the air circulation device can be steplessly increased; and

[0053] In response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, the duty ratio of the pulse ratio is reduced so that the driving power of the air circulation device can be steplessly reduced to maintain the temperature of the air in the air frying cavity between the upper limit and the lower limit of the preset target temperature.

[0054] According to an embodiment of the present application, the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes the frequency of the pulse wave.

[0055] According to an embodiment of the present application, step S200 includes the following steps:

[0056] In response to the frequency of the pulse wave, a frequency conversion device of the air circulation device instantly adjusts the frequency of the power supply provided to a fan of the air circulation device via a power supply circuit of the air circulation device to steplessly adjust the motor speed of the fan, so that the driving power of the air circulation device can be steplessly adjusted.

[0057] According to an embodiment of the present application, step S100 includes the following steps:

[0058] In response to the air fryer being in a preheating stage, adjusting the frequency of the pulse wave to 0, so that the fan of the air circulation device stops rotating;

[0059] In response to the air fryer being in a primary heating stage, the frequency of the pulse wave is increased so that the motor speed of the fan can be increased steplessly;

[0060] In response to the air fryer being in a constant temperature heating stage, modulating the frequency of the pulse wave to steplessly adjust the motor speed of the fan; and

[0061] In response to the air fryer being in a cooling stage, the frequency of the pulse wave is adjusted to a rated frequency, so that the motor speed of the fan can be adjusted to a full speed.

[0062] According to an embodiment of the present application, in response to the air fryer being in a constant temperature heating stage, the step of modulating the frequency of the pulse wave to steplessly adjust the motor speed of the fan comprises the steps of:

[0063] In response to the air fryer being in the constant temperature heating stage, analyzing the temperature of the air flowing in the air frying cavity detected in real time to obtain a temperature change of the air flowing in the air frying cavity;

[0064] In response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, increasing the frequency of the pulse ratio so that the motor speed of the fan can be increased steplessly; and

[0065] In response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, the frequency of the pulse ratio is reduced so that the motor speed of the fan can be steplessly reduced to maintain the temperature of the air in the air frying cavity between the upper limit and the lower limit of the preset target temperature.

[0066] According to another aspect of the present application, an embodiment of the present application further provides an electronic device, a stepless speed control system, which is applicable to an air fryer, wherein the air fryer comprises an air frying cavity, an air circulation device for driving air to circulate in the air frying cavity, and an air heating device for heating the air circulated in the air frying cavity, wherein the stepless speed control system comprises:

[0067] a signal modulation module, used for modulating the parameters of a stepless control signal according to the working stage of the air fryer; and

[0068] A power regulating module is used to steplessly regulate the driving power of the air circulation device in response to the modulated stepless control signal to control the flow speed of the air in the air frying cavity.

[0069] According to an embodiment of the present application, the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes a duty cycle of the pulse wave.

[0070] According to one embodiment of the present application, the power regulation module is further used for: in response to the high level of the pulse wave, instantly turning on a power supply circuit of the air circulation device through a switch device of the air circulation device, so that a current working voltage of a fan of the air circulation device is equal to the real-time voltage applied to the fan through the power supply circuit, so that the fan is in a high-speed operating state; and in response to the low level of the pulse wave, instantly disconnecting the power supply circuit through the switch device, so that the current working voltage of the fan is equal to zero, so that the fan is in a low-speed operating state.

[0071] According to an embodiment of the present application, the signal modulation module includes a duty cycle adjustment module, wherein the duty cycle adjustment module is used to: in response to the air fryer being in a preheating stage, adjust the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device can be adjusted to zero power; in response to the air fryer being in a primary heating stage, increase the duty cycle of the pulse wave, so that the driving power of the air circulation device can be increased steplessly; in response to the air fryer being in a constant temperature heating stage, modulate the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device; and in response to the air fryer being in a cooling stage, adjust the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to full power.

[0072] According to an embodiment of the present application, the signal modulation module further includes a temperature analysis module communicatively connected to the duty cycle adjustment module, wherein the temperature analysis module is used to analyze the temperature of the air flowing in the air frying cavity detected in real time in response to the air fryer being in the constant temperature heating stage, so as to obtain the temperature change of the air flowing in the air frying cavity; wherein the duty cycle adjustment module is further used to increase the duty cycle of the pulse ratio in response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, so that the driving power of the air circulation device can be steplessly increased; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, reduce the duty cycle of the pulse ratio, so that the driving power of the air circulation device can be steplessly reduced, so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature.

[0073] According to an embodiment of the present application, the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes the frequency of the pulse wave.

[0074] According to one embodiment of the present application, the power regulation module is further used to respond to the frequency of the pulse wave, and to instantly adjust the power frequency of a fan of the air circulation device via a power supply circuit of the air circulation device through a frequency conversion device of the air circulation device, so as to steplessly adjust the motor speed of the fan, so that the driving power of the air circulation device can be steplessly adjusted.

[0075] According to an embodiment of the present application, the signal modulation module includes a frequency adjustment module, wherein the frequency adjustment module is used to, in response to the air fryer being in a preheating stage, adjust the frequency of the pulse wave to 0 so that the fan of the air circulation device stops rotating; in response to the air fryer being in a primary heating stage, increase the frequency of the pulse wave so that the motor speed of the fan can be increased steplessly; in response to the air fryer being in a constant temperature heating stage, modulate the frequency of the pulse wave to steplessly adjust the motor speed of the fan; and in response to the air fryer being in a cooling stage, adjust the frequency of the pulse wave to the rated frequency so that the motor speed of the fan can be adjusted to full speed.

[0076] According to an embodiment of the present application, the signal modulation module further includes a temperature analysis module communicatively connected to the frequency adjustment module, wherein the temperature analysis module is used to analyze the temperature of the air flowing in the air frying cavity detected in real time in response to the air fryer being in the constant temperature heating stage, so as to obtain the temperature change of the air flowing in the air frying cavity; wherein the frequency adjustment module is further used to increase the frequency of the pulse ratio in response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, so that the motor speed of the fan can be steplessly increased; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, reduce the frequency of the pulse ratio, so that the motor speed of the fan can be steplessly reduced, so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature.

[0077] According to another aspect of the present application, an embodiment of the present application further provides an electronic device, including:

[0078] a processor for executing program instructions; and

[0079] a memory, wherein the memory is configured to store program instructions executable by the processor to implement a stepless speed control method, wherein the stepless speed control method comprises the steps of:

[0080] S100: modulating a parameter of a stepless control signal according to a working stage of an air fryer; and

[0081] S200: In response to the modulated stepless control signal, steplessly adjust the driving power of an air circulation device of the air fryer to control the flow rate of air in an air frying cavity of the air fryer.

[0082] According to another aspect of the present application, an embodiment of the present application further provides a control system for an air fryer, wherein the air fryer comprises an air frying cavity, an air circulation device for driving air to circulate in the air frying cavity, and an air heating device for heating the air circulated in the air frying cavity, wherein the control system for the air fryer comprises:

[0083] a driving control module, used for controlling the air circulation device to drive the air to flow in the air frying cavity;

[0084] a heating control module, used to control the air heating device to heat the air flowing in the air frying cavity; and

[0085] A flow rate control module is used to selectively control the flow rate of the air in the air frying cavity according to the material of the object to be fried contained in the air frying cavity, so that the flow rate of the air matches the object to be fried.

[0086] According to an embodiment of the present application, the flow rate control module includes a material identification module, an instruction calling module and a threshold control module which are communicatively connected to each other, wherein the material identification module is used to identify the material of the object to be fried to obtain a material identification result; wherein the instruction calling module is used to call a preset threshold instruction corresponding to the material identification result from an instruction list; wherein the threshold control module is used to respond to the preset threshold instruction to adjust the working threshold of the driving power of the air circulation device to be equal to a preset threshold, so that the real-time speed of the air flowing in the air frying cavity is not greater than the maximum flow speed.

[0087] According to an embodiment of the present application, the control system for an air fryer further includes a temperature control module, wherein the temperature control module is used to selectively control the maximum temperature of the air in the air frying cavity according to the material of the item to be fried contained in the air frying cavity, so that the maximum temperature of the air matches the item to be fried.

[0088] According to another aspect of the present application, an embodiment of the present application further provides an electronic device, including:

[0089] a processor for executing program instructions; and

[0090] a memory, wherein the memory is configured to store program instructions executable by the processor to implement a control method for an air fryer, wherein the control method for an air fryer comprises the steps of:

[0091] Controlling an air circulation device of the air fryer to drive air to flow in an air frying cavity of the air fryer;

[0092] controlling an air heating device of the air fryer to heat the air flowing in the air frying cavity; and

[0093] According to the material of the object to be fried contained in the air frying cavity, the flow speed of the air in the air frying cavity is selectively adjusted so that the flow speed of the air matches the object to be fried.

[0094] Further objects and advantages of the present invention will be fully apparent from an understanding of the following description and the accompanying drawings.

[0095] These and other objects, features and advantages of the present invention will be more fully understood from the following detailed description, accompanying drawings and claims. BRIEF DESCRIPTION OF THE DRAWINGS

[0096] Figure 1 It is a flow chart of a control method for an air fryer according to an embodiment of the present invention.

[0097] Figure 2 A schematic diagram showing the flow rate control step in the control method for an air fryer according to the above embodiment of the present invention

[0098] Figure 3 4 is a flow chart of a stepless speed control method according to an embodiment of the present invention.

[0099] Figure 4 An example of a stepless control signal in the stepless speed control method according to the above embodiment of the present invention is shown.

[0100] Figure 5 A schematic flow chart of the power regulation step in the stepless speed control method according to the above embodiment of the present invention is shown.

[0101] Figure 6 A schematic diagram showing the working principle of an air fryer in the stepless speed control method according to the above embodiment of the present invention is shown.

[0102] Figure 7 A schematic diagram showing the change of duty cycle in the stepless speed control method according to the above embodiment of the present invention is shown.

[0103] Figure 8A schematic flow chart of the signal modulation step in the stepless speed control method according to the above embodiment of the present invention is shown.

[0104] Fig. 9 A first example of the duty ratio modulation step in the stepless speed control method according to the above embodiment of the present invention is shown.

[0105] Fig.10 A second example of the duty ratio modulation step in the stepless speed control method according to the above embodiment of the present invention is shown.

[0106] Fig.11 A modified implementation of the stepless speed control method according to the above embodiment of the present invention is shown.

[0107] Fig.12 A schematic flow chart of the power regulation step in the stepless speed control method according to the above-mentioned variant implementation mode of the present invention is shown.

[0108] Fig.13 A schematic flow chart of the signal modulation step in the stepless speed control method according to the above-mentioned variant implementation mode of the present invention is shown.

[0109] Fig.14 Schematic diagram of a control system for an air fryer according to an embodiment of the present invention.

[0110] Fig.15 Schematic diagram of a block diagram of a stepless speed control system according to an embodiment of the present invention.

[0111] Fig.16 A modified implementation of the stepless speed control system according to the above embodiment of the present invention is shown.

[0112] Fig.17 A block diagram of an electronic device according to an embodiment of the present invention is shown.

[0113] Fig.18 Schematic diagram of a block diagram of an air frying device according to an embodiment of the present invention.

[0114] Fig.19 A three-dimensional schematic diagram of the air frying device according to the above embodiment of the present invention is shown.

[0115] Fig. 20 A cross-sectional schematic diagram of the air frying device according to the above embodiment of the present invention is shown.

[0116] Fig.21 A schematic diagram of an explosion of the air frying device according to the above embodiment of the present invention is shown. DETAILED DESCRIPTION

[0117] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0118] In the present invention, the term "one" in the claims and the specification should be understood as "one or more", that is, in one embodiment, the number of an element can be one, while in another embodiment, the number of the element can be multiple. Unless it is clearly indicated in the disclosure of the present invention that the number of the element is only one, the term "one" cannot be understood as unique or single, and the term "one" cannot be understood as a limitation on the quantity.

[0119] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0120] At present, the existing air fryer usually uses switches such as mechanical relays to control the running state of the fan by means of open circuit and closed circuit, so that the fan can only exist in the full-speed running state and the stopped running state. In this way, when the existing air fryer is just started and is in the preheating stage, the fan is in the full-speed running state to fan the air to flow quickly, causing the air in the existing air fryer to take a long time to be heated to the target temperature, resulting in poor air frying efficiency and quality of the existing air fryer, and even seriously affecting the air frying effect of the fried items. When the existing air fryer is in the constant temperature heating stage (that is, the air in the shell is heated to close to the target temperature), the fan is still in the full-speed running state, causing the existing air fryer to lose a large amount of heat, resulting in the electric heater of the existing air fryer having to be frequently turned on to supplement the heat, which not only causes a large amount of heat to be wasted, but also aggravates the fluctuation amplitude of the air temperature in the shell, affecting the air frying effect of the fried items, such as the appearance and taste of the fried food.

[0121] In addition, since the fan of the existing air fryer runs at full speed during the air frying of different ingredients, the air flow rate in the existing air fryer is kept at the maximum, and the dehydration effect and degreasing effect of the existing air fryer are both at the maximum state, which is disastrous for ingredients with low water and fat contents, and can easily cause the cooked ingredients to become dry, hard, or even dry, seriously affecting the cooking effect and the taste of the ingredients.

[0122] In fact, in order to obtain an excellent air frying effect, the air temperature in the air fryer needs to be quickly heated to the target temperature and maintained at the target temperature as constantly as possible. It is also necessary to select different wind speeds according to the material of the fried object (such as water content and / or fat content) so that the dehydration effect and degreasing effect match the material of the fried object. In order to achieve this effect, the present invention provides a control method and a stepless speed control method for an air fryer and a system and device thereof, which can select the flow rate of air in the air fryer according to the material of the fried object, so as to reasonably control the dehydration effect and degreasing effect of the fried object, thereby improving the air frying effect of the fried object. It can be understood that the fried object mentioned in the present invention can be food such as French fries, vegetables, meat or fish, etc., or it can be inedible industrial products, etc., and the present invention is not limited to this.

[0123] Schematic method

[0124] Reference to the attached drawings of the specification Figures 1 to 10 As shown, a control method for an air fryer according to an embodiment of the present invention is illustrated, wherein the control method is applicable to an air fryer 1, and the air fryer 1 generally may include an air frying cavity 10 for accommodating items to be fried, an air circulation device 20 for driving air to circulate in the air frying cavity 10, and an air heating device 30 for heating the air flowing in the air frying cavity 10. Thus, after the items to be fried are placed in the air frying cavity 10, the air heated by the air heating device 30 will contact the items to be fried under the drive of the air circulation device 20, so as to complete the air frying process of the items to be fried.

[0125] It is to be understood that although the present invention is Figures 1 to 10 The air fryer 1 shown is used as an example to illustrate the advantages and features of the control method for an air fryer of the present invention, but the specific structure of the air fryer 1 is only an example and does not constitute a limitation on the control method for an air fryer of the present invention. For example, in other examples of the present invention, the specific structure of the air fryer 1 can also be implemented as other types of structures as long as the desired air frying effect can be achieved.

[0126] Specifically, according to the above embodiments of the present application, Figure 1 As shown, the control method for an air fryer may include the steps of:

[0127] A: controlling an air circulation device 20 of an air fryer 1 to drive air to flow in an air frying cavity 10 of the air fryer 1;

[0128] B: controlling an air heating device 30 of the air fryer 1 to heat the air flowing in the air frying cavity 10; and

[0129] C: According to the material of the object to be fried contained in the air frying cavity 10, the flow speed of the air in the air frying cavity 10 is selectively regulated so that the flow speed of the air matches the material of the object to be fried.

[0130] It is worth noting that, since the control method for an air fryer of the present application can selectively adjust the flow rate of the air in the air frying cavity 10, and the flow rate of the air directly determines the dehydration effect and / or degreasing effect of the fried object during the air frying process, the control method for an air fryer of the present application can match the flow rate of the air with the material (such as water content and / or fat content) of the fried object. For example, when the water content or fat content of the fried object is high, the control method for an air fryer of the present application chooses to increase the flow rate of the air to increase the dehydration efficiency or degreasing efficiency of the air fryer 1 on the fried object, thereby obtaining an excellent air frying effect; and when the water content or fat content of the fried object is low, the control method for an air fryer of the present application chooses to reduce the flow rate of the air to reduce the dehydration efficiency or degreasing efficiency of the air fryer 1 on the fried object, and still can obtain an excellent air frying effect.

[0131] In addition, the driving power of the air circulation device 20 is positively correlated with the flow rate of the air driven by the air circulation device 20, that is, the greater the driving power of the air circulation device 20, the greater the flow rate of the air driven by the air circulation device 20, and the greater the flow rate of the air in the air frying cavity 10; and vice versa.

[0132] Preferably, in step C of the control method for an air fryer: according to the water content and / or fat content of the item to be fried, the working threshold of the driving power of the air circulation device 20 is selectively adjusted so that the maximum flow velocity of the air in the air frying cavity 10 is positively correlated with the water content and / or fat content of the item to be fried.

[0133] It can be understood that the maximum flow rate mentioned in the present application is not the speed at which the air circulation device 20 of the air fryer 1 drives the air to flow in the air frying cavity 10 when it is in full power working state, but the maximum value of the air flow rate after being adjusted by the control method for the air fryer of the present application according to the material of the item to be fried, that is, for the items to be fried of different materials, the maximum flow rate is different.

[0134] For example, for food materials such as French fries with low water content or fat content, the control method for an air fryer of the present application can adjust the working threshold of the driving power of the air circulation device 20 to reduce the maximum flow velocity of the air in the air frying cavity 10, thereby preventing excessive air flow velocity from causing excessive dehydration or defatting of food materials; and for food materials such as meat with high water content or fat content, the control method for an air fryer of the present application can adjust the working threshold of the driving power of the air circulation device 20 to increase the maximum flow velocity of the air in the air frying cavity 10, thereby preventing excessive air flow velocity from causing insufficient dehydration or defatting of food materials, thereby affecting the taste.

[0135] It is worth noting that in an example of the present application, the control method for an air fryer of the present application can artificially set the working threshold of the driving power of the air circulation device 20 according to the material of the object to be fried, such as through an interactive interface or buttons. In other words, the control method for an air fryer of the present application can artificially adjust the maximum flow rate of the air in the air frying cavity 10 according to the material of the object to be fried.

[0136] Of course, in other examples of the present application, the control method for an air fryer of the present application can also intelligently select the working threshold of the driving power of the air circulation device 20 according to the material of the object to be fried through pre-stored data. That is to say, the control method for an air fryer of the present application can intelligently adjust the maximum flow speed of the air in the air frying cavity 10 according to the material of the object to be fried.

[0137] More specifically, according to the above embodiments of the present application, Figure 2 As shown, the step C of the control method for an air fryer may include the steps of:

[0138] C1: Identify the material of the object to be blasted to obtain a material identification result;

[0139] C2: calling a preset threshold instruction corresponding to the material recognition result from the instruction list; and

[0140] C3: In response to the preset threshold instruction, the working threshold of the driving power of the air circulation device 20 is adjusted to be equal to a preset threshold, so that the real-time speed of the air flowing in the air frying cavity is not greater than the maximum flow speed.

[0141] It is worth mentioning that in the step C1 of the control method for an air fryer of the present application, identification can be performed by, but not limited to, empirical judgment, machine vision or component detection, etc., and the present application will not repeat them. It is understandable that the correspondence between the preset threshold value and the material in the instruction list of the present application can be obtained through human experience, or can be obtained through experiments or big data.

[0142] In addition, since the driving power of the air circulation device 20 of the present application can be adjusted by modulating the parameters of a stepless control signal, in the step C3 of the control method for an air fryer of the present application: the working threshold of the driving power of the air circulation device 20 can be regulated by modulating the parameters of a stepless control signal within a parameter modulation range.

[0143] In other words, when it is necessary to lower the working threshold of the driving power of the air circulation device 20, it is only necessary to set a smaller parameter modulation range. At this time, by modulating the parameters of the stepless control signal within the parameter modulation range, it is possible to ensure that the driving power of the air circulation device 20 will not be greater than the preset threshold; and when it is necessary to increase the working threshold of the driving power of the air circulation device 20, it is only necessary to set a larger parameter modulation range.

[0144] It is worth noting that, since the fried objects of different materials have different sensitivities to temperature, it is necessary to selectively adjust the maximum temperature of the air in the air frying cavity 10 for different fried objects, so as to avoid affecting the air frying effect of the fried objects due to excessive temperature, or even damaging the fried objects. Figure 1 As shown, the control method for the air fryer may further include the steps of:

[0145] D: According to the material of the food to be fried contained in the air frying cavity 10, the maximum temperature of the air in the air frying cavity 10 is selectively adjusted so that the maximum temperature of the air matches the food to be fried.

[0146] In addition, since the air frying process of the air fryer 1 can generally be divided into different working stages, when the air fryer 1 is in different working stages, the air circulation device 20 of the air fryer 1 needs to be controlled to adjust the flow speed of the air in the air frying cavity 10, which helps to improve the air frying effect of the air fryer 1. Figure 1 As shown, the control method for an air fryer of the present application may further include the steps of:

[0147] E: According to the working stage of the air fryer 1, a stepless speed control method is used to control the flow speed of the air in the air frying cavity 10 to improve the air frying effect of the air fryer 1. Specifically, Figure 3 As shown, according to the above embodiment of the present application, the stepless speed control method may include the steps of:

[0148] S100: modulating a parameter of a stepless control signal according to the working stage of the air fryer 1; and

[0149] S200: In response to the modulated stepless control signal, the driving power of an air circulation device 20 of the air fryer 1 is steplessly adjusted to control the flow speed of the air in the air frying cavity 10 to meet the requirements of the air frying process.

[0150] Preferably, in the step D of the control method for an air fryer of the present application: the parameter of the stepless control signal is modulated within the parameter modulation range by the stepless speed control method, so that the real-time driving power of the air circulation device 20 is not greater than the preset threshold. Of course, in other examples of the present application, the stepless speed control method can also modulate the parameter of the stepless control signal within the full range to allow the air circulation device 20 to work at full power, that is, the preset threshold can be implemented as, but not limited to, the rated power of the air circulation device 20.

[0151] It is worth noting that Figure 6 As shown, the air circulation device 20 of the air fryer 1 may include, but is not limited to, a power supply circuit 21 for communicating with a power source E, a fan 22 provided in the power supply circuit 21, and a speed regulating device 23 provided in the power supply circuit 21, wherein the speed regulating device 23 is used to respond to the stepless control signal and instantly switch the real-time motor speed of the fan 23, so as to achieve stepless adjustment of the driving power of the air circulation device 20. It is understandable that the fan 22 may be configured with a DC motor or an AC motor.

[0152] In particular, the stepless speed control method of the present invention can steplessly adjust the driving power of the air circulation device 20 through the stepless control signal, so that the air circulation device 20 can work at any required driving power between zero power and full power. That is to say, the stepless speed control method of the present invention can make the fan 22 of the air circulation device 20 work at any speed operation state (corresponding to any required driving power operation state of the air circulation device 20) between the full speed operation state (corresponding to the full power operation state of the air circulation device 20) and the stop operation state (corresponding to the zero power operation state of the air circulation device 20), thereby continuously adjusting the flow speed of the air in the air frying cavity 10, unlike the existing air fryer which can only make the fan run at full speed during the air frying process, thereby ensuring that the stepless speed control method of the present invention can make the air flow rate and air temperature in the air fryer 1 better meet the requirements of the air frying process.

[0153] Preferably, if Figure 4 As shown, the stepless control signal of the present invention can be implemented as a pulse wave, wherein the parameters of the stepless control signal can include, but are not limited to, the duty cycle or frequency of the pulse wave. It can be understood that the pulse wave can be, but is not limited to, implemented as a rectangular wave, a sawtooth wave, a triangle wave, a spike wave or a step wave, etc. For ease of description, the rectangular wave is used as an example for explanation below. In addition, the duty cycle of the pulse wave refers to the ratio between the pulse width (i.e., the time t0 corresponding to the high level of the pulse wave within a pulse period T) and the pulse period T, i.e., t0 / T.

[0154] For example, Figure 6 As shown, the speed regulating device 23 of the air circulation device 20 can be implemented as a switch device 231, wherein the switch device 231 and the fan 22 are connected in series to the power supply circuit 21, and is used to respond to the stepless control signal to instantly turn on and off the power supply circuit 21 to switch the real-time motor speed of the fan 23, thereby realizing stepless adjustment of the driving power of the air circulation device 20.

[0155] Specifically, Figure 5 As shown, the step S200 of the stepless speed control method may include the following steps:

[0156] S210: in response to the high level of the pulse wave, instantly turning on the power supply circuit 21 of the air circulation device 20 through the switch device 231, so that the current working voltage of the fan 22 is equal to the real-time voltage applied to the fan 22 through the power supply circuit 21, so that the fan 22 is in a high-speed operation state; and

[0157] S220: In response to the low level of the pulse wave, the power supply circuit 21 is instantly disconnected through the switch device 231, so that the current working voltage of the fan 22 is equal to zero, so that the fan 22 is in a low speed operation state.

[0158] It is worth noting that when the duty cycle of the pulse wave is increased, the pulse time of the pulse wave becomes longer, so that the time that the fan 22 of the air circulation device 20 is in a high-speed operation state within one pulse cycle is prolonged, and the time that it is in a low-speed operation state is shortened, so that the effective motor speed of the fan 22 within one pulse cycle is increased, and thus the driving power of the air circulation device 20 is increased, so that the flow speed of the air driven by the air circulation device 20 is increased accordingly; correspondingly, when the duty cycle of the pulse wave is decreased, the pulse time of the pulse wave becomes shorter, so that the time that the fan 22 of the air circulation device 20 is in a high-speed operation state within one pulse cycle is shortened, and the time that it is in a low-speed operation state is prolonged, so that the effective motor speed of the fan 22 within one pulse cycle is reduced, and thus the driving power of the air circulation device 20 is reduced, so that the flow speed of the air driven by the air circulation device 20 is reduced accordingly.

[0159] It is understandable that the pulse frequency of the stepless control signal of the present invention may be above 50 Hz, which means that the state switching frequency of the fan 22 of the air circulation device 20 is also above 50 Hz (i.e., the fan 22 switches states at least once within 20 ms), so as to improve the adjustment accuracy of the driving power of the air circulation device 20. Of course, in other examples of the present invention, the pulse frequency of the stepless control signal may also be less than 50 Hz, which will not be elaborated in the present invention.

[0160] Preferably, the switch device 231 is implemented as a solid-state relay, so that while satisfying the high-frequency switching of the power supply circuit 21, it can also directly drive a large current load (such as the fan 22) through the tiny stepless control signal. It is understandable that although the traditional mechanical relay can also control the on or off of the output circuit, there will be a huge transient current at the moment of on or off, causing the traditional mechanical relay to generate electric sparks at the moment of on or off, which will damage the life of the relay and pose a huge safety hazard. In addition, the action time of the traditional mechanical relay is relatively long, which is completely unable to meet the requirements of the stepless speed control method of the present invention for high-frequency switching or instant switching.

[0161] It is worth noting that in daily life, the power supply used by the air fryer 1 usually provides alternating current, for example, in China, an alternating current with a frequency of 50 Hz is usually used, and in the United States, an alternating current with a frequency of 60 Hz is usually used. Therefore, when the power supply circuit 21 of the air circulation device 20 is instantly turned on by the switching device 231 of the air circulation device 20, the current working voltage of the fan 22 of the air circulation device 20 will also change with time, so that the effective working voltage of the fan 22 will still change with the change of the duty cycle of the wireless control signal.

[0162] For example, Figure 7 As shown, taking the case where the power source E provides 50 Hz alternating current and the stepless control signal is a pulse wave with a frequency of 100 Hz as an example, when the duty cycle of the stepless control signal is 1 / 2, the effective working voltage of the fan 22 is equal to half of the effective voltage of the power source E; when the duty cycle of the stepless control signal is reduced to be less than 1 / 2, the effective working voltage of the fan 22 is reduced accordingly to be less than half of the effective voltage of the power source E, so that the driving power of the air circulation device 20 is reduced, that is, the motor speed of the fan 22 is reduced; when the duty cycle of the stepless control signal is increased to be greater than 1 / 2, the effective working voltage of the fan 22 is increased accordingly to be greater than half of the effective voltage of the power source E, so that the driving power of the air circulation device 20 is increased, that is, the motor speed of the fan 22 is increased.

[0163] It is worth mentioning that the stepless speed control method of the present application can divide the working process of the air fryer 1 into four working stages, which are: preheating stage, primary heating stage, constant temperature heating stage and cooling stage. In particular, when the air fryer 1 is in the preheating stage, the air heating device 30 of the air fryer 1 starts heating, but because its own temperature is low, the heating efficiency of the air is low. At this time, it is necessary to stop the fan 22 from rotating to ensure that the temperature of the air heating device 30 itself rises quickly; when the air fryer 1 is in the primary heating stage, the temperature of the air heating device 30 of the air fryer 1 itself is high, but the air temperature difference at various places in the air frying cavity 10 is large. At this time, it is necessary to rotate the fan 22 (such as full speed rotation, etc.) to reduce the air temperature difference at various places in the air frying cavity 10, so that the air temperature at various places in the air frying cavity 10 is maintained constant. When the air fryer 1 is in the constant temperature heating stage, the air temperature at various locations in the air frying cavity 10 reaches a preset target temperature. At this time, the rotation speed of the fan 22 needs to be reduced to reduce heat loss so that the temperature of the air flowing in the air frying cavity 10 is maintained within the upper and lower limits of the preset target temperature. When the air fryer 1 is in the cooling stage, the air heating device 30 of the air fryer 1 stops heating, but will still heat the air due to its own high temperature. At this time, the fan 22 needs to be rotated at full speed to ensure that the temperature of the air heating device 30 itself and the air temperature at various locations in the air frying cavity 10 are quickly reduced so as to take out the items to be fried.

[0164] Preferably, the stepless speed control method of the present application can divide the working stage of the air fryer 1 according to time. For example, within one minute after the air fryer 1 is started, the air fryer 1 is in the preheating stage; between one minute and five minutes after the air fryer 1 is started, the air fryer 1 is in the primary heating stage; between five minutes and twenty-five minutes after the air fryer 1 is started, the air fryer 1 is in the constant temperature heating stage; between twenty-five minutes and thirty minutes after the air fryer 1 is started, the air fryer 1 is in the cooling stage. It is understandable that the time length of each working stage of the air fryer 1 is not limited thereto, and it can be adaptively set according to the characteristics of the items to be fried and the air frying requirements, and this application will not go into details.

[0165] Of course, in other examples of the present application, the stepless speed control method can also divide the working stage of the air fryer 1 according to other factors such as temperature or a combination of time and temperature. For example, from the start of the air fryer 1 to the temperature of the air heating device 30 reaching a predetermined heating temperature (such as 300°C), the air fryer 1 is in the preheating stage; from the temperature of the air heating device 30 reaching the predetermined heating temperature to the air temperature in the air frying cavity 10 reaching the preset target temperature, the air fryer 1 is in the primary heating stage; within a predetermined time after the air temperature in the air frying cavity 10 reaches the preset target temperature, the air fryer 1 is in the constant temperature heating stage; after the air temperature in the air frying cavity 10 is maintained at the preset target temperature for the predetermined time until the temperature of the air heating device 30 reaches a predetermined cooling temperature (such as 40°C), the air fryer 1 is in the cooling stage.

[0166] For example, Figure 8 As shown, the step S100 of the stepless speed control method may include the following steps:

[0167] S110: In response to the air fryer 1 being in a preheating stage, adjusting the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device 20 is adjusted to zero power;

[0168] S120: In response to the air fryer 1 being in a primary heating stage, increasing the duty cycle of the pulse wave so that the driving power of the air circulation device 20 can be increased steplessly;

[0169] S130: In response to the air fryer 1 being in a constant temperature heating stage, modulating the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device 20; and

[0170] S140: In response to the air fryer 1 being in a cooling stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device 20 can be adjusted to full power.

[0171] It is worth noting that when the air fryer 1 is in the primary heating stage, since the air temperature in the air frying cavity 10 is relatively low at the beginning, the air fryer 1 needs to quickly increase the air temperature more urgently. Therefore, the fan 22 of the air circulation device 20 needs to rotate at a low speed to circulate the air in the air frying cavity 10 at a low speed so as to quickly increase the air temperature in the air frying cavity 10. Then, as the air temperature in the air frying cavity 10 rises to approach the preset target temperature, the air fryer 1 needs to keep the air temperature at various locations in the air frying cavity 10 consistent more urgently. Therefore, the fan 22 of the air circulation device 20 needs to rotate at full speed to circulate the air in the air frying cavity 10 quickly so as to keep the air temperature in the air frying cavity 10 as consistent as possible.

[0172] Preferably, the primary heating stage of the air fryer 1 can be further divided into a rapid heating stage and a uniform heating stage located after the rapid heating stage, and when the air fryer 1 is in a rapid heating stage, the fan 22 of the air circulation device 20 needs to rotate at a low speed; when the air fryer 1 is in a uniform heating stage, the fan 22 of the air circulation device 20 needs to rotate at full speed. It can be understood that the primary heating stage can be divided according to factors such as time or temperature to obtain the rapid heating stage and the uniform heating stage. For example, the rapid heating stage and the uniform heating stage can be divided by the air temperature in the air frying cavity 10 reaching 90-95% of the preset target temperature.

[0173] For example, Figure 8 As shown, the step S120 of the stepless speed control method may include the following steps:

[0174] S121: In response to the air fryer 1 being in a rapid temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to a preset low threshold value, so that the driving power of the air circulation device 20 can be adjusted to low power; and

[0175] S122: In response to the air fryer 1 being in a uniform temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device 20 can be adjusted to full power.

[0176] Preferably, the preset low threshold value may be implemented as 0.4 to 0.6. For example, the preset low threshold value may be equal to 0.5, that is, the duty cycle of the pulse wave is equal to 0.5, so that the air circulation device 20 is in a half-power working state.

[0177] It is worth mentioning that Fig. 9 As shown, in the first example of the present application, when the air fryer 1 is in the constant temperature heating stage, the air fryer 1 can maintain the air temperature in the air frying cavity 10 between the upper limit and the lower limit of the preset target temperature by adjusting the heating power of the air heating device 30, thereby reducing the fluctuation amplitude of the air temperature in the air frying cavity 10. At this time, the stepless speed control method only needs to adjust the driving power of the air circulation device 20 in response to the air fryer 1 being in the constant temperature heating stage, so that the heat dissipation power of the air fryer 1 is substantially equal to the heating power of the air heating device 30, which helps to reduce the fluctuation amplitude of the air temperature in the air frying cavity 10.

[0178] For example, Fig. 9 As shown, according to the above-mentioned first example of the present application, in the step S130 of the stepless speed control method: in response to the air fryer 1 being in the constant temperature heating stage, the duty cycle of the pulse wave is adjusted to a preset high threshold value to adjust the driving power of the air circulation device 20 to a high power, so that the heat dissipation power of the air fryer 1 is substantially equal to the heating power of the air heating device 30.

[0179] Preferably, the preset high threshold value can be implemented as 0.7 to 0.9. For example, the preset high threshold value can be equal to 0.8, that is, the duty cycle of the pulse wave is equal to 0.8, so that the heat dissipation power of the air fryer 1 is substantially equal to the heating power of the air heating device 30.

[0180] In the second example of the present application, when the air fryer 1 is in the constant temperature heating stage, the air fryer 1 can also adjust the driving power of the air circulation device 20 to maintain the air temperature in the air frying cavity 10 between the upper limit and the lower limit of the preset target temperature, thereby reducing the fluctuation amplitude of the air temperature in the air frying cavity 10. At this time, the air fryer 1 does not need to adjust the heating power of the air heating device 30, and the stepless speed control method only needs to respond to the air fryer 1 being in the constant temperature heating stage, and according to the temperature change of the air in the air frying cavity 10, correspondingly adjust the driving power of the air circulation device 20, so that the air temperature in the air frying cavity 10 can be maintained between the upper limit and the lower limit of the preset target temperature.

[0181] For example, Fig.10 As shown, according to the above second example of the present application, the step S130 of the stepless speed control method may include the steps of:

[0182] S131: In response to the air fryer 1 being in the constant temperature heating stage, analyzing the temperature of the air flowing in the air frying cavity 10 of the air fryer 1 detected in real time to obtain the temperature change of the air flowing in the air frying cavity 10;

[0183] S132: in response to the current temperature of the air rising to a first temperature threshold between the upper limit and the lower limit of the preset target temperature, increasing the duty cycle of the pulse wave so that the driving power of the air circulation device 20 can be steplessly increased; and

[0184] S133: In response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, the duty cycle of the pulse wave is reduced so that the driving power of the air circulation device 20 can be steplessly reduced to maintain the air temperature in the air frying cavity 10 between the upper limit and the lower limit of the preset target temperature.

[0185] Preferably, both the first temperature threshold and the second temperature threshold can be implemented as the preset target temperature, so as to further reduce the upper limit and the lower limit of the preset target temperature. Of course, in other examples of the present invention, the first temperature threshold can also be any temperature between the preset target temperature and the upper limit of the preset target temperature; the second temperature threshold can also be any temperature between the lower limit of the preset target temperature and the preset target temperature, which will not be described in detail in the present invention.

[0186] It is worth mentioning that Figures 11 to 13 A variant implementation of the stepless speed control method according to the above embodiment of the present invention is shown, wherein the parameter of the stepless control signal may include, but is not limited to, the frequency of the pulse wave. At this time, the speed regulating device 23 of the air circulation device 20 may be implemented as a frequency conversion device 232, wherein the frequency conversion device 232 and the fan 22 are arranged in the power supply circuit 21, and are used to respond to the stepless control signal, and adjust the power frequency provided to the fan 23 via the power supply circuit 21 in real time through the frequency conversion device 232, so as to switch the real-time motor speed of the fan 23, thereby realizing stepless adjustment of the driving power of the air circulation device 20.

[0187] It can be understood that, since the frequency converter 232 is an electric energy control device that utilizes the on-off function of power semiconductor devices to convert industrial frequency power into another frequency, the power frequency provided to the fan 23 via the power supply circuit 21 can be adjusted in real time by the frequency converter 232 and can be positively correlated with the frequency of the stepless control signal. That is, when the frequency of the pulse wave is increased, the power frequency provided to the fan 23 via the power supply circuit 21 adjusted in real time by the frequency converter 232 also increases accordingly; when the frequency of the pulse wave is decreased, the power frequency provided to the fan 23 via the power supply circuit 21 adjusted in real time by the frequency converter 232 also decreases accordingly.

[0188] For example, Fig.12 As shown, in the above-mentioned variant implementation of the present invention, the step S200 of the stepless speed control method may include the steps of:

[0189] S210': In response to the frequency of the pulse wave, the frequency of the power supplied to the fan 23 via the power supply circuit 21 is instantly adjusted by the frequency converter 232 to steplessly adjust the motor speed of the fan 22, so that the driving power of the air circulation device 20 can be steplessly adjusted.

[0190] In addition, if Fig.13 As shown, the step S100 of the stepless speed control method may include the following steps:

[0191] S110': in response to the air fryer 1 being in a preheating stage, adjusting the frequency of the pulse wave to 0 Hz, so that the fan 22 of the air circulation device 20 stops rotating;

[0192] S120': In response to the air fryer 1 being in a primary heating stage, the frequency of the pulse wave is increased, so that the motor speed of the fan 22 of the air circulation device 20 can be increased steplessly;

[0193] S130': in response to the air fryer 1 being in a constant temperature heating stage, modulating the frequency of the pulse wave to steplessly adjust the motor speed of the fan 22 of the air circulation device 20; and

[0194] S140': In response to the air fryer 1 being in a cooling stage, the frequency of the pulse wave is adjusted to a rated frequency, so that the motor speed of the fan 22 of the air circulation device 20 can be adjusted to a full speed.

[0195] Preferably, if Fig.13 As shown, the step S130' of the stepless speed control method may include the following steps:

[0196] S131′: In response to the air fryer 1 being in the constant temperature heating stage, analyzing the temperature of the air flowing in the air frying cavity 10 of the air fryer 1 detected in real time to obtain the temperature change of the air flowing in the air frying cavity 10;

[0197] S132': in response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, increasing the frequency of the pulse wave so that the motor speed of the fan 22 of the air circulation device 20 can be increased steplessly; and

[0198] S133': In response to the current temperature of the air dropping to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, the frequency of the pulse wave is reduced so that the motor speed of the fan 22 of the air circulation device 20 can be steplessly reduced to maintain the temperature of the air in the air frying cavity 10 between the upper limit and the lower limit of the preset target temperature.

[0199] Schematic system

[0200] Reference to the attached drawings of the specification Fig.14 As shown, a control system for an air fryer according to an embodiment of the present invention is illustrated, wherein the control system 70 for the air fryer may include a drive control module 71, a heating control module 72 and a flow rate control module 73 which are communicatively connected to each other, wherein the drive control module 71 is used to control an air circulation device of the air fryer to drive air to flow in an air frying cavity of the air fryer; wherein the heating control module 72 is used to control an air heating device of the air fryer to heat the air flowing in the air frying cavity; wherein the flow rate control module 73 is used to selectively control the flow rate of the air in the air frying cavity according to the material of the items to be fried contained in the air frying cavity, so that the flow rate of the air matches the items to be fried.

[0201] It is worth noting that in the above embodiments of the present application, Fig.14As shown, the flow rate control module 73 may include a material identification module 731, an instruction calling module 732 and a threshold control module 733 which are communicatively connected to each other, wherein the material identification module 731 is used to identify the material of the object to be fried to obtain a material identification result; wherein the instruction calling module 732 is used to call a preset threshold instruction corresponding to the material identification result from an instruction list; wherein the threshold control module 733 is used to respond to the preset threshold instruction to adjust the working threshold of the driving power of the air circulation device to be equal to a preset threshold, so that the real-time speed of the air flowing in the air frying cavity is not greater than the maximum flow speed.

[0202] In one example of this application, Fig.14 As shown, the control system 70 for the air fryer may further include a temperature control module 74, wherein the temperature control module 74 is used to selectively control the maximum temperature of the air in the air frying cavity according to the material of the item to be fried contained in the air frying cavity, so that the maximum temperature of the air matches the item to be fried.

[0203] In one example of this application, Fig.14 As shown, the control system 70 for the air fryer may further include a stepless speed control system 40, wherein the stepless speed control system 40 may include a signal modulation module 41 and a power regulation module 42 which are communicatively connected to each other, wherein the signal modulation module 41 is used to modulate the parameters of a stepless control signal according to the working stage of the air fryer 1; wherein the power regulation module 42 is used to steplessly adjust the driving power of the air circulation device 20 in response to the modulated stepless control signal to control the flow speed of the air in the air frying cavity 10.

[0204] Reference to the attached drawings of the specification Fig.15 As shown, a stepless speed control system according to an embodiment of the present invention is illustrated, wherein the stepless speed control system 40 is applicable to an air fryer 1, and the air fryer 1 includes an air frying cavity 10, an air circulation device 20 for driving air to circulate in the air frying cavity 10, and an air heating device 30 for heating the air circulated in the air frying cavity 10.

[0205] Specifically, Fig.15As shown, the stepless speed control system 40 may include a signal modulation module 41 and a power regulation module 42 which are communicatively connected to each other, wherein the signal modulation module 41 is used to modulate the parameters of a stepless control signal according to the working stage of the air fryer 1; wherein the power regulation module 42 is used to respond to the modulated stepless control signal and steplessly adjust the driving power of the air circulation device 20 to control the flow speed of the air in the air frying cavity 10.

[0206] It is worth noting that, according to the above-mentioned embodiment of the present application, the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes the duty cycle of the pulse wave.

[0207] More specifically, if Figure 6 and Fig.15 As shown, the power regulation module 42 is further used for: in response to the high level of the pulse wave, instantly turning on a power supply circuit 21 of the air circulation device 20 through a switch device 231 of the air circulation device 20, so that a current working voltage of a fan 22 of the air circulation device 20 is equal to the real-time voltage applied to the fan 22 through the power supply circuit 21, so that the fan 22 is in a high-speed operation state; and in response to the low level of the pulse wave, instantly disconnecting the power supply circuit 21 through the switch device 231, so that the current working voltage of the fan 22 is equal to zero, so that the fan 22 is in a low-speed operation state.

[0208] In the above-mentioned embodiment of the present application, the signal modulation module 41 includes a duty cycle adjustment module 411, wherein the duty cycle adjustment module 411 is used to: in response to the air fryer 1 being in a preheating stage, adjust the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device 20 can be adjusted to zero power; in response to the air fryer 1 being in a primary heating stage, increase the duty cycle of the pulse wave, so that the driving power of the air circulation device 20 can be increased steplessly; in response to the air fryer 1 being in a constant temperature heating stage, modulate the duty cycle of the pulse wave to steplessly adjust the driving power of the air circulation device 20; and in response to the air fryer 1 being in a cooling stage, adjust the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device 20 can be adjusted to full power.

[0209] In an example of the present application, the duty cycle adjustment module 411 is further used for: in response to the air fryer 1 being in a rapid heating stage of the primary heating stage, adjusting the duty cycle of the pulse wave to a preset low threshold value, so that the driving power of the air circulation device 20 can be adjusted to low power; and in response to the air fryer 1 being in a uniform heating stage of the primary heating stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device 20 can be adjusted to the full power.

[0210] In another example of the present application, the duty cycle adjustment module 411 is further used to: in response to the air fryer 1 being in the constant temperature heating stage, adjust the duty cycle of the pulse wave to a preset high threshold value to adjust the driving power of the air circulation device 20 to a high power, so that the heat dissipation power of the air fryer 1 is equal to the heating power of the air heating device 30 of the air fryer 1.

[0211] According to the above embodiments of the present application, Fig.15 As shown, the signal modulation module 41 further includes a temperature analysis module 412 communicatively connected to the duty cycle adjustment module 411, wherein the temperature analysis module 412 is used for analyzing the temperature of the air flowing in the air frying cavity 10 detected in real time in response to the air fryer 1 being in the constant temperature heating stage, so as to obtain the temperature change of the air flowing in the air frying cavity 10; wherein the duty cycle adjustment module 411 is further used for increasing the duty cycle of the pulse ratio in response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, so that the driving power of the air circulation device 20 can be increased steplessly; and decreasing the duty cycle of the pulse ratio in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, so that the driving power of the air circulation device 20 can be decreased steplessly, so that the temperature of the air in the air frying cavity 10 is maintained between the upper limit and the lower limit of the preset target temperature.

[0212] It is worth mentioning that Fig.16 A modified implementation of the stepless speed control system according to the above embodiment of the present application is shown. Specifically, compared with the above embodiment of the present application, the stepless speed control system 40 according to the modified implementation of the present application is different in that the stepless control signal is a pulse wave, and the parameter of the stepless control signal includes the frequency of the pulse wave.

[0213] In the above-mentioned variant implementation of the present application, Fig.11 and Fig.16As shown, the power regulating module 42 is further used to respond to the frequency of the pulse wave, and to instantly adjust the power frequency of a fan 22 of the air circulation device 20 provided to the air circulation device 20 via a power supply circuit 21 of the air circulation device 20 through a frequency conversion device 232 of the air circulation device 20, so as to steplessly adjust the motor speed of the fan 22, so that the driving power of the air circulation device 20 can be steplessly adjusted.

[0214] In the above-mentioned variant implementation of the present application, Fig.16 As shown, the signal modulation module 41 includes a frequency adjustment module 413, wherein the frequency adjustment module 413 is used for adjusting the frequency of the pulse wave to 0 in response to the air fryer 1 being in a preheating stage, so that the fan 22 of the air circulation device 20 stops rotating; in response to the air fryer 1 being in a primary heating stage, increasing the frequency of the pulse wave so that the motor speed of the fan 22 can be increased steplessly; in response to the air fryer 1 being in a constant temperature heating stage, modulating the frequency of the pulse wave to steplessly adjust the motor speed of the fan 22; and in response to the air fryer 1 being in a cooling stage, adjusting the frequency of the pulse wave to the rated frequency so that the motor speed of the fan 22 can be adjusted to full speed.

[0215] Preferably, the signal modulation module 41 further includes a temperature analysis module 412 communicatively connected to the frequency adjustment module 413, wherein the temperature analysis module 412 is used for analyzing the temperature of the air flowing in the air frying cavity 10 detected in real time in response to the air fryer 1 being in the constant temperature heating stage, so as to obtain the temperature change of the air flowing in the air frying cavity 10; wherein the frequency adjustment module 413 is further used for increasing the frequency of the pulse ratio in response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, so that the motor speed of the fan 22 can be steplessly increased; and decreasing the frequency of the pulse ratio in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, so that the motor speed of the fan 22 can be steplessly reduced, so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature.

[0216] Schematic equipment

[0217] Below, reference Fig.17 To describe an electronic device ( Fig.17 1 shows a block diagram of an electronic device according to an embodiment of the present invention). Fig.17 As shown, the electronic device 60 includes one or more processors 61 and a memory 62 .

[0218] The processor 61 may be a central processing unit (CPU) or other forms of processing units having data processing capabilities and / or instruction execution capabilities, and may control other components in the electronic device 60 to perform desired functions.

[0219] The memory 62 may include one or more computer program products, and the computer program products may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, a random access memory (RAM) and / or a cache memory (cache), etc. The non-volatile memory may include, for example, a read-only memory (ROM), a hard disk, a flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 61 may execute the program instructions to implement the methods of the various embodiments of the present invention described above and / or other desired functions.

[0220] In one example, if Fig.17 As shown, the electronic device 60 may further include: an input device 63 and an output device 64, and these components are interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0221] For example, the input device 63 may be a camera module for collecting image data or video data, etc.

[0222] The output device 64 can output various information to the outside, including classification results, etc. The output device 64 can include, for example, a display, a speaker, a printer, a communication network and a remote output device connected thereto, and the like.

[0223] Of course, to simplify, Fig.17 Only some of the components related to the present invention in the electronic device 60 are shown, and components such as a bus, an input / output interface, etc. are omitted. In addition, according to specific application conditions, the electronic device 60 may also include any other appropriate components.

[0224] It is worth mentioning that Figures 18 to 21 As shown, an embodiment of the present invention can further provide an air frying device, wherein the air frying device can be an air fryer 1 and the above-mentioned stepless speed control system 40, wherein the stepless temperature control system 40 is configured in the air fryer 1, and the stepless temperature control system 40 is used to regulate the flow speed of air in the air fryer 1, which helps to improve the air frying effect of the air fryer 1.

[0225] Specifically, the air fryer 1 may include an air frying cavity 10 for accommodating items to be fried, an air circulation device 20 for driving air to circulate in the air frying cavity 10, and an air heating device 30 for heating the air flowing in the air frying cavity 10. The stepless speed control system 40 may include a signal modulation module 41 and a power adjustment module 42 that are communicatively connected to each other, wherein the signal modulation module 41 is used to modulate the parameters of a stepless control signal according to the working stage of the air fryer 1; wherein the power adjustment module 42 is used to steplessly adjust the driving power of the air circulation device 20 in response to the modulated stepless control signal to control the flow speed of the air in the air frying cavity 10. In this way, after the items to be fried are placed in the air frying cavity 10, the air heated by the air heating device 30 will contact the items to be fried under the drive of the air circulation device 20 to complete the air frying process of the items to be fried. At the same time, the stepless speed control system 40 adjusts the flow speed of the air in the air fryer 1 according to the working stage of the air fryer 1, so as to improve the air frying effect of the air fryer 1 on the fried items.

[0226] It is worth noting that in the above-mentioned embodiment of the present application, the air heating device 30 can be implemented as, but not limited to, an electric heater 31 disposed in the air frying cavity 10, wherein the electric heater 31 is used to convert electrical energy into thermal energy to heat the air in the air frying cavity 10. Of course, in other examples of the present application, the air heating device 30 can also be implemented as a fluid heat exchanger disposed in the air frying cavity 10, wherein the fluid heat exchanger is used to transfer the thermal energy of the hot fluid to the air in the air frying cavity 10 to heat the air in the air frying cavity 10.

[0227] In addition, according to the above embodiments of the present application, Figure 6 and Fig.11 As shown, the air circulation device 20 of the air fryer 1 may include, but is not limited to, a power supply circuit 21 for communicating with a power source E, a fan 22 provided in the power supply circuit 21, and a speed regulating device 23 provided in the power supply circuit 21, wherein the speed regulating device 23 is used to respond to the stepless control signal and instantly switch the real-time motor speed of the fan 23 so as to achieve stepless adjustment of the driving power of the air circulation device 20. It is understandable that the fan 22 may be configured with a DC motor or an AC motor. It is understandable that the speed regulating device 23 of the air circulation device 20 may be implemented as the switch device 231 or the frequency conversion device 232.

[0228] For example, Figures 19 to 21As shown, the air frying cavity 10 of the air fryer 1 may include a shell 11 defining an internal cavity 110 and an air frying component 12, wherein the air frying component 12 is disposed on the shell 11, and the air frying component 12 is used to keep the object to be fried in the internal cavity 110, so that the air heated by the air heating device 30 can circulate in the internal cavity 110 of the air frying cavity 10 under the drive of the air circulation device 20 to contact the object to be fried, thereby completing the air frying process of the object to be fried.

[0229] Preferably, the air frying component 12 is detachably disposed on the housing 11, so as to conveniently take and place the item to be fried in the air frying component 12. For example, the air frying component 12 can be installed on the housing 11 by means of a snap fit or a door lock, but is not limited thereto. It is understood that the air frying component 12 can be implemented as a container such as a frying basket with a mesh, but is not limited thereto. Of course, the air frying component 12 can also be other types of components such as a rotary grill or a skewer, as long as the item to be fried can be kept in the internal chamber 110 of the housing 11, and the present invention will not repeat them in detail.

[0230] According to the above embodiments of the present invention, Fig. 20 As shown, the fan 22 of the air circulation device 20 generally includes a motor 221 and a fan blade assembly 222, wherein the fan blade assembly 222 is drivably disposed on the motor 221 for rotating under the drive of the motor 221 to fan the air to flow in a circulation manner in the air frying cavity 10.

[0231] It is worth noting that since the temperature of the air heated by the air heating device 30 (hereinafter referred to as hot air) is relatively high, and the hot air will take away the moisture of the fried items to form a high temperature and humid environment in the air frying cavity 10, and the motor 221 of the fan 22 working in a high temperature and humid environment will seriously affect its service life and safety performance. Therefore, in order to solve this problem, the air frying cavity 10 of the air fryer 1 of the present invention may further include a partition assembly 13, wherein the partition assembly 13 is arranged in the internal chamber 110 of the shell 11 to separate the internal chamber 110 into an upper compartment 1101 and a lower compartment 1102. The motor 221 of the fan 22 is disposed in the upper compartment 1101 of the internal chamber 110, and the fan blade assembly 222 of the fan 22 may include a first fan blade 2221 located in the lower compartment 1102 of the internal chamber 110, for fanning the air to flow cyclically in the lower compartment 1102 under the drive of the motor 221. At the same time, the air frying component 12 and the air heating device 30 are both disposed in the lower compartment 1102 of the internal chamber 110 to form a high temperature and humid environment in the lower compartment 1102 of the internal chamber 110, so as to ensure that the air frying process of the fried object is completed while the upper compartment 1101 of the internal chamber 110 still maintains a relatively dry environment, which helps to improve the service life and safety performance of the motor 221 of the fan 22.

[0232] Preferably, the partition assembly 13 of the air frying cavity 10 may include an upper partition 131 and a lower partition 132, wherein the upper partition 131 and the lower partition 132 are arranged at intervals in the internal chamber 110 of the shell 11, so as to form a middle partition layer 1103 between the upper compartment 1101 and the lower compartment 1102 through the upper partition 131 and the lower partition 132, that is, the upper partition 131 and the lower partition 132 divide the internal chamber 110 from top to bottom into the upper compartment 1101, the middle partition layer 1103 and the lower compartment 1102, so as to prevent the heat in the lower compartment 1102 from being transferred to the upper compartment 1101 in large quantities through the middle partition layer 1103, thereby preventing the motor 221 of the fan 22 from working in a high temperature environment.

[0233] More preferably, the fan blade assembly 222 of the fan 22 may further include a second fan blade 2222 located in the middle partition layer 1103 of the internal chamber 110, which is used to fan the air in the middle partition layer 1103 under the drive of the motor 211, so as to enhance the heat insulation effect of the middle partition layer 1103. It can be understood that the first fan blade 2221 and the second fan blade 2222 are both arranged on the output shaft of the motor 221, and the second fan blade 2222 is located between the first fan blade 2221 and the main body of the motor 221, that is, the first fan blade 2221 is located on the outside of the second fan blade 2222, so that the first fan blade 2221 serves as the outer fan blade of the fan 22, and the second fan blade 2222 serves as the inner fan blade of the fan 22.

[0234] It is worth mentioning that according to the above embodiment of the present invention, the air fryer 1 may further include a temperature sensor 50, wherein the temperature sensor 50 is disposed in the air frying cavity 10, and the temperature sensor 50 is communicatively connected to the temperature analysis module 412 of the stepless speed control system 40, wherein the temperature sensor 50 is used to detect the temperature of the air flowing in the air frying cavity 10 in real time, and transmit the detected temperature data to the temperature analysis module 412 for analysis. It is understandable that the temperature sensor 50 may be, but is not limited to, implemented as an NTC temperature sensor.

[0235] Preferably, the temperature sensor 50 is disposed in the lower compartment 1102 of the internal chamber 110 of the shell 11 and is located adjacent to the air heating device 30 so as to accurately detect the real-time temperature of the air circulating in the lower compartment 1102 .

[0236] It is worth noting that the stepless speed control system 40 of the air frying device of the present invention can be, but is not limited to, implemented as a single-chip microcomputer or a control chip, wherein the single-chip microcomputer or the control chip is built into the air frying cavity 10 of the air fryer 1, so that the air frying device can be used as an integrated device. Of course, in other examples of the present invention, the stepless speed control system 40 of the air frying device can also be implemented as a control terminal, wherein the control terminal is externally placed in the air fryer 1, so that the air frying device can be used as a split device. It can be understood that the control terminal is communicatively connected to the air fryer 1, and the air fryer 1 can still be steplessly temperature controlled through the control terminal to achieve a good air frying effect.

[0237] It is worth mentioning that according to another aspect of the present application, an embodiment of the present application further provides an air frying device, wherein the air frying device can be an air fryer 1 and the above-mentioned control system 70 for the air fryer, wherein the control system 70 for the air fryer is configured in the air fryer 1, for regulating the air frying process of the air fryer 1, which helps to improve the air frying effect of the air fryer 1.

[0238] The block diagrams of the devices, apparatuses, equipment, and systems involved in the present invention are only illustrative examples and are not intended to require or imply that they must be connected, arranged, and configured in the manner shown in the block diagrams. As will be appreciated by those skilled in the art, these devices, apparatuses, equipment, and systems can be connected, arranged, and configured in any manner. Words such as "including", "comprising", "having", etc. are open words, referring to "including but not limited to", and can be used interchangeably with them. The words "or" and "and" used here refer to the words "and / or" and can be used interchangeably with them, unless the context clearly indicates otherwise. The word "such as" used here refers to the phrase "such as but not limited to", and can be used interchangeably with it.

[0239] It should also be noted that in the device, apparatus and method of the present invention, each component or each step can be decomposed and / or reassembled, and such decomposition and / or reassembly should be regarded as an equivalent solution of the present invention.

[0240] The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein may be applied to other aspects without departing from the scope of the present invention. Therefore, the present invention is not intended to be limited to the aspects shown herein, but rather to the widest scope consistent with the principles and novel features disclosed herein.

[0241] It should be understood by those skilled in the art that the embodiments of the present invention described above and shown in the accompanying drawings are only examples and do not limit the present invention. The purpose of the present invention has been fully and effectively achieved. The functional and structural principles of the present invention have been demonstrated and explained in the embodiments, and the embodiments of the present invention may be deformed or modified in any way without departing from the principles.

Claims

1. A control method for an air fryer, characterized in that: Includes steps: Controlling an air circulation device of the air fryer to drive air to flow in an air frying cavity of the air fryer; the air circulation device comprises a power supply circuit for connecting to a power source, a fan arranged in the power supply circuit, and a speed regulating device arranged in the power supply circuit; Controlling an air heating device of the air fryer to heat the air flowing in the air frying cavity; as well as Identify the material of the object to be fried, and obtain a material identification result of the object to be fried, wherein the material identification result includes water content and / or fat content; and call a preset threshold instruction corresponding to the material identification result from an instruction list according to the material identification result of the object to be fried; and in response to the preset threshold instruction, regulating the working threshold of the driving power of the air circulation device to be equal to a preset threshold, so that the real-time speed of the air flowing in the air frying cavity is not greater than the maximum flow speed of the air in the air frying cavity, and the maximum flow speed is positively correlated with the water content and / or the fat content of the object to be fried; According to the water content and / or the fat content of the object to be fried contained in the air frying cavity, selectively adjusting the maximum temperature of the air in the air frying cavity so that the maximum temperature of the air matches the object to be fried; According to the working stage of the air fryer, the parameters of a stepless control signal are modulated, the stepless control signal is a pulse wave, and the parameters of the stepless control signal include a duty cycle or a frequency; the working stage includes a preheating stage, a primary heating stage, a constant temperature heating stage and a cooling stage, and the primary heating stage includes a rapid heating stage and a uniform heating stage; Wherein, if the parameter of the stepless control signal includes a duty cycle, modulating the parameter of the stepless control signal according to the working stage of the air fryer comprises the steps of: In response to the air fryer being in the preheating stage, adjusting the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device is adjusted to zero power; In response to the air fryer being in the rapid temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to a preset low threshold value so that the driving power of the air circulation device can be adjusted to low power; and In response to the air fryer being in the uniform temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to full power; In response to the air fryer being in the constant temperature heating stage, adjusting the duty cycle of the pulse wave to a preset high threshold value, so as to adjust the driving power of the air circulation device to a high power, so that the heat dissipation power of the air fryer is equal to the heating power of the air heating device; or, in response to the air fryer being in the constant temperature heating stage, analyzing the temperature of the air flowing in the air frying cavity of the air fryer detected in real time, so as to obtain the temperature change of the air flowing in the air frying cavity; and, in response to the current temperature of the air rising to a first temperature threshold value between an upper limit and a lower limit of a preset target temperature, increasing the duty cycle of the pulse wave, so that the driving power of the air circulation device can be increased steplessly; and in response to the current temperature of the air decreasing to a second temperature threshold value between the upper limit and the lower limit of the preset target temperature, decreasing the duty cycle of the pulse wave, so that the driving power of the air circulation device can be decreased steplessly, so that the air temperature in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature; In response to the air fryer being in the cooling stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to the full power; Wherein, if the parameter of the stepless control signal includes frequency, the step of modulating the parameter of the stepless control signal according to the working stage of the air fryer comprises the steps of: In response to the air fryer being in the preheating stage, adjusting the frequency of the pulse wave to 0 Hz, so that the fan of the air circulation device stops rotating; In response to the air fryer being in the primary heating stage, the frequency of the pulse wave is increased so that the motor speed of the fan of the air circulation device can be increased steplessly; In response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, increasing the frequency of the pulse wave so that the motor speed of the fan of the air circulation device can be steplessly increased; and In response to the current temperature of the air dropping to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, the frequency of the pulse wave is reduced so that the motor speed of the fan of the air circulation device can be steplessly reduced, so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature; In response to the air fryer being in the cooling stage, adjusting the frequency of the pulse wave to a rated frequency, so that the motor speed of the fan of the air circulation device can be adjusted to a full speed; In response to the modulated stepless control signal, the driving power of the air circulation device of the air fryer is steplessly adjusted to control the flow speed of the air in the air frying cavity of the air fryer.

2. Stepless speed control method, characterized in that: Includes steps: S100: modulating a parameter of a stepless control signal according to a working stage of an air fryer; wherein an air circulation device of the air fryer comprises a power supply circuit for connecting to a power source, a fan arranged in the power supply circuit, and a speed regulating device arranged in the power supply circuit; the stepless control signal is a pulse wave, and the parameter of the stepless control signal comprises a duty cycle or a frequency of the pulse wave; The parameter of the stepless control signal includes the duty cycle of the pulse wave, and the step of modulating the parameter of the stepless control signal according to the working stage of the air fryer includes the steps of: In response to the air fryer being in a preheating stage, adjusting the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device can be adjusted to zero power; In response to the air fryer being in a rapid temperature rise stage of a primary heating stage, adjusting the duty cycle of the pulse wave to a preset low threshold value, so that the driving power of the air circulation device can be adjusted to low power; and In response to the air fryer being in a uniform temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to full power; In response to the air fryer being in a constant temperature heating stage, the duty cycle of the pulse wave is adjusted to a preset high threshold value, so as to adjust the driving power of the air circulation device to a high power, so that the heat dissipation power of the air fryer is equal to the heating power of an air heating device of the air fryer; or, in response to the current temperature of the air rising to a first temperature threshold value between an upper limit and a lower limit of a preset target temperature, the duty cycle of the pulse wave is increased, so that the driving power of the air circulation device can be steplessly increased; and in response to the current temperature of the air decreasing to a second temperature threshold value between the upper limit and the lower limit of the preset target temperature, the duty cycle of the pulse wave is reduced, so that the driving power of the air circulation device can be steplessly reduced, so that the temperature of the air in an air frying cavity of the air fryer is maintained between the upper limit and the lower limit of the preset target temperature; In response to the air fryer being in a cooling stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to full power; The parameter of the stepless control signal includes the frequency of the pulse wave, and the step of modulating the parameter of the stepless control signal according to the working stage of the air fryer includes the steps of: In response to the air fryer being in the preheating stage, adjusting the frequency of the pulse wave to 0, so that the fan of the air circulation device stops rotating; In response to the air fryer being in the primary heating stage, the frequency of the pulse wave is increased so that the motor speed of the fan can be increased steplessly; In response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, the frequency of the pulse wave is increased so that the motor speed of the fan can be steplessly increased; and in response to the current temperature of the air decreasing to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, the frequency of the pulse wave is decreased so that the motor speed of the fan can be steplessly decreased so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature; In response to the air fryer being in the cooling stage, adjusting the frequency of the pulse wave to a rated frequency so that the motor speed of the fan can be adjusted to a full speed; S200: In response to the modulated stepless control signal, the driving power of the air circulation device of the air fryer is steplessly adjusted to control the flow speed of the air in the air frying cavity.

3. The stepless speed control method according to claim 2, wherein: The step S200 comprises the following steps: In response to the high level of the pulse wave, the power supply circuit of the air circulation device is instantly turned on through a switch device of the air circulation device, so that the current working voltage of the fan of the air circulation device is equal to the real-time voltage applied to the fan through the power supply circuit, so that the fan is in a high-speed operation state; and In response to the low level of the pulse wave, the power supply circuit is instantly disconnected through the switch device, so that the current working voltage of the fan is equal to zero, so that the fan is in a low-speed operation state.

4. The stepless speed control method according to claim 2, wherein: The step S200 comprises the following steps: In response to the frequency of the pulse wave, a frequency conversion device of the air circulation device instantly adjusts the frequency of the power supply provided to the fan of the air circulation device via the power supply circuit of the air circulation device, so as to steplessly adjust the motor speed of the fan, so that the driving power of the air circulation device can be steplessly adjusted.

5. A stepless speed control system, applicable to an air fryer, wherein the air fryer comprises an air frying cavity, an air circulation device for driving air to circulate in the air frying cavity, and an air heating device for heating the air circulated in the air frying cavity, the air circulation device comprising a power supply circuit for connecting to a power source, a fan arranged in the power supply circuit, and a speed regulating device arranged in the power supply circuit; characterized in that: The stepless speed control system includes: A signal modulation module, used for modulating the parameters of a stepless control signal according to the working stage of the air fryer; the stepless control signal is a pulse wave, and the parameters of the stepless control signal include the duty cycle or frequency of the pulse wave; The parameter of the stepless control signal includes a duty cycle of the pulse wave, the signal modulation module includes a duty cycle adjustment module, and a temperature analysis module communicatively connected to the duty cycle adjustment module, wherein the duty cycle adjustment module is used to: in response to the air fryer being in a preheating stage, adjust the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device can be adjusted to zero power; in response to the air fryer being in a primary heating stage, increase the duty cycle of the pulse wave, so that the driving power of the air circulation device can be increased steplessly; the temperature analysis module is used to: in response to the air fryer being in a constant temperature heating stage, analyze the temperature of the air flowing in the air frying cavity detected in real time to obtain the temperature change of the air flowing in the air frying cavity wherein the duty cycle adjustment module is further used to: in response to the current temperature of the air rising to a first temperature threshold between an upper limit and a lower limit of a preset target temperature, increase the duty cycle of the pulse wave so that the driving power of the air circulation device can be steplessly increased; and in response to the current temperature of the air decreasing to a second temperature threshold between the upper limit and the lower limit of the preset target temperature, reduce the duty cycle of the pulse wave so that the driving power of the air circulation device can be steplessly reduced so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature; and in response to the air fryer being in a cooling stage, adjust the duty cycle of the pulse wave to 1 so that the driving power of the air circulation device can be adjusted to full power; The parameter of the stepless control signal includes the frequency of the pulse wave, the signal modulation module includes a frequency adjustment module, and a temperature analysis module communicatively connected to the frequency adjustment module, wherein the frequency adjustment module is used to: in response to the air fryer being in the preheating stage, adjust the frequency of the pulse wave to 0, so that the fan of the air circulation device stops rotating; in response to the air fryer being in the primary heating stage, increase the frequency of the pulse wave, so that the motor speed of the fan can be increased steplessly; the temperature analysis module is used to: in response to the air fryer being in the constant temperature heating stage, analyze the temperature of the air flowing in the air frying cavity detected in real time to obtain the temperature change of the air flowing in the air frying cavity; The frequency adjustment module is further used for: in response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, increasing the frequency of the pulse wave so that the motor speed of the fan can be increased steplessly; and in response to the current temperature of the air decreasing to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, decreasing the frequency of the pulse wave so that the motor speed of the fan can be decreased steplessly so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature; and in response to the air fryer being in the cooling stage, adjusting the frequency of the pulse wave to the rated frequency so that the motor speed of the fan can be adjusted to full speed; A power regulating module is used for steplessly regulating the driving power of the air circulation device in response to the modulated stepless control signal to control the flow speed of the air in the air frying cavity.

6. The stepless speed control system according to claim 5, wherein: The power regulation module is further used for: In response to the high level of the pulse wave, the power supply circuit of the air circulation device is instantly turned on through a switch device of the air circulation device, so that the current working voltage of the fan of the air circulation device is equal to the real-time voltage applied to the fan through the power supply circuit, so that the fan is in a high-speed operation state; And in response to the low level of the pulse wave, the power supply circuit is instantly disconnected through the switch device, so that the current working voltage of the fan is equal to zero, so that the fan is in a low speed operation state.

7. The stepless speed control system according to claim 5, wherein: The power regulation module is further used to respond to the frequency of the pulse wave and to instantly adjust the power frequency of the fan of the air circulation device via the power supply circuit of the air circulation device through a frequency conversion device of the air circulation device, so as to steplessly adjust the motor speed of the fan, so that the driving power of the air circulation device can be steplessly adjusted.

8. An electronic device, characterized in that include: a processor for executing program instructions; and a memory, wherein the memory is configured to store program instructions executable by the processor to implement a stepless speed control method, wherein the stepless speed control method comprises the steps of: S100: modulating a parameter of a stepless control signal according to a working stage of an air fryer; The air circulation device comprises a power supply circuit for connecting to a power source, a fan arranged in the power supply circuit, and a speed regulating device arranged in the power supply circuit; the stepless control signal is a pulse wave, and the parameter of the stepless control signal comprises a duty cycle or a frequency of the pulse wave; The parameter of the stepless control signal includes the duty cycle of the pulse wave, and the step of modulating the parameter of the stepless control signal according to the working stage of the air fryer includes the steps of: In response to the air fryer being in a preheating stage, adjusting the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device can be adjusted to zero power; In response to the air fryer being in a rapid temperature rise stage of a primary heating stage, adjusting the duty cycle of the pulse wave to a preset low threshold value, so that the driving power of the air circulation device can be adjusted to low power; and In response to the air fryer being in a uniform temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to full power; In response to the air fryer being in a constant temperature heating stage, the duty cycle of the pulse wave is adjusted to a preset high threshold value, so as to adjust the driving power of the air circulation device to a high power, so that the heat dissipation power of the air fryer is equal to the heating power of an air heating device of the air fryer; or, in response to the current temperature of the air rising to a first temperature threshold value between an upper limit and a lower limit of a preset target temperature, the duty cycle of the pulse wave is increased, so that the driving power of the air circulation device can be steplessly increased; and in response to the current temperature of the air decreasing to a second temperature threshold value between the upper limit and the lower limit of the preset target temperature, the duty cycle of the pulse wave is reduced, so that the driving power of the air circulation device can be steplessly reduced, so that the temperature of the air in an air frying cavity of the air fryer is maintained between the upper limit and the lower limit of the preset target temperature; In response to the air fryer being in a cooling stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to full power; The parameter of the stepless control signal includes the frequency of the pulse wave, and the step of modulating the parameter of the stepless control signal according to the working stage of the air fryer includes the steps of: In response to the air fryer being in the preheating stage, adjusting the frequency of the pulse wave to 0, so that the fan of the air circulation device stops rotating; In response to the air fryer being in the primary heating stage, the frequency of the pulse wave is increased so that the motor speed of the fan can be increased steplessly; In response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, the frequency of the pulse wave is increased so that the motor speed of the fan can be steplessly increased; and in response to the current temperature of the air decreasing to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, the frequency of the pulse wave is decreased so that the motor speed of the fan can be steplessly decreased so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature; In response to the air fryer being in the cooling stage, adjusting the frequency of the pulse wave to a rated frequency so that the motor speed of the fan can be adjusted to a full speed; S200: In response to the modulated stepless control signal, the driving power of the air circulation device of the air fryer is steplessly adjusted to control the flow speed of the air in the air frying cavity.

9. An electronic device, characterized in that include: a processor for executing program instructions; and a memory, wherein the memory is configured to store program instructions executable by the processor to implement a control method for an air fryer, wherein the control method for an air fryer comprises the steps of: Controlling an air circulation device of the air fryer to drive air to flow in an air frying cavity of the air fryer; the air circulation device comprises a power supply circuit for connecting to a power source, a fan arranged in the power supply circuit, and a speed regulating device arranged in the power supply circuit; Controlling an air heating device of the air fryer to heat the air flowing in the air frying cavity; as well as Identify the material of the object to be fried, and obtain a material identification result of the object to be fried, wherein the material identification result includes water content and / or fat content; and call a preset threshold instruction corresponding to the material identification result from an instruction list according to the material identification result of the object to be fried; and in response to the preset threshold instruction, regulating the working threshold of the driving power of the air circulation device to be equal to a preset threshold, so that the real-time speed of the air flowing in the air frying cavity is not greater than the maximum flow speed of the air in the air frying cavity, and the maximum flow speed is positively correlated with the water content and / or the fat content of the object to be fried; According to the water content and / or the fat content of the object to be fried contained in the air frying cavity, selectively adjusting the maximum temperature of the air in the air frying cavity so that the maximum temperature of the air matches the object to be fried; According to the working stage of the air fryer, the parameters of a stepless control signal are modulated, the stepless control signal is a pulse wave, and the parameters of the stepless control signal include a duty cycle or a frequency; the working stage includes a preheating stage, a primary heating stage, a constant temperature heating stage and a cooling stage, and the primary heating stage includes a rapid heating stage and a uniform heating stage; Wherein, if the parameter of the stepless control signal includes a duty cycle, modulating the parameter of the stepless control signal according to the working stage of the air fryer comprises the steps of: In response to the air fryer being in the preheating stage, adjusting the duty cycle of the pulse wave to 0, so that the driving power of the air circulation device is adjusted to zero power; In response to the air fryer being in the rapid temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to a preset low threshold value so that the driving power of the air circulation device can be adjusted to low power; and In response to the air fryer being in the uniform temperature rise stage of the primary heating stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to full power; In response to the air fryer being in the constant temperature heating stage, adjusting the duty cycle of the pulse wave to a preset high threshold value, so as to adjust the driving power of the air circulation device to a high power, so that the heat dissipation power of the air fryer is equal to the heating power of the air heating device; or, in response to the air fryer being in the constant temperature heating stage, analyzing the temperature of the air flowing in the air frying cavity of the air fryer detected in real time, so as to obtain the temperature change of the air flowing in the air frying cavity; and, in response to the current temperature of the air rising to a first temperature threshold value between an upper limit and a lower limit of a preset target temperature, increasing the duty cycle of the pulse wave, so that the driving power of the air circulation device can be increased steplessly; and in response to the current temperature of the air decreasing to a second temperature threshold value between the upper limit and the lower limit of the preset target temperature, decreasing the duty cycle of the pulse wave, so that the driving power of the air circulation device can be decreased steplessly, so that the air temperature in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature; In response to the air fryer being in the cooling stage, adjusting the duty cycle of the pulse wave to 1, so that the driving power of the air circulation device can be adjusted to the full power; Wherein, if the parameter of the stepless control signal includes frequency, the step of modulating the parameter of the stepless control signal according to the working stage of the air fryer comprises the steps of: In response to the air fryer being in the preheating stage, adjusting the frequency of the pulse wave to 0 Hz, so that the fan of the air circulation device stops rotating; In response to the air fryer being in the primary heating stage, the frequency of the pulse wave is increased so that the motor speed of the fan of the air circulation device can be increased steplessly; In response to the current temperature of the air rising to the first temperature threshold between the upper limit and the lower limit of the preset target temperature, increasing the frequency of the pulse wave so that the motor speed of the fan of the air circulation device can be steplessly increased; and In response to the current temperature of the air dropping to the second temperature threshold between the upper limit and the lower limit of the preset target temperature, the frequency of the pulse wave is reduced so that the motor speed of the fan of the air circulation device can be steplessly reduced, so that the temperature of the air in the air frying cavity is maintained between the upper limit and the lower limit of the preset target temperature; In response to the air fryer being in the cooling stage, adjusting the frequency of the pulse wave to a rated frequency, so that the motor speed of the fan of the air circulation device can be adjusted to a full speed; In response to the modulated stepless control signal, the driving power of the air circulation device of the air fryer is steplessly adjusted to control the flow speed of the air in the air frying cavity of the air fryer.

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