Control method of oil fume purification equipment and oil fume purification equipment

Abstract

The invention discloses a control method of oil fume purification equipment and the oil fume purification equipment. The oil fume purification equipment comprises an exhaust fume collecting hood shell and an oil fume detection module, the control method comprises the following steps: firstly, transmitting a detection light signal to a corresponding furnace end by using an oil smoke detection module, receiving a light signal reflected by oil smoke particles corresponding to the furnace end, defining the light signal as a reflected light signal, and then identifying that a first type of user cooking action exists according to the signal intensity of the reflected light signal; and finally, within the duration time range corresponding to the cooking actions of the first type of users, eliminating the interference signal intensity corresponding to the cooking actions of the first type of users from the signal intensity of the reflected light signals so as to detect the oil smoke concentration in the correspondingly formed target light curtain detection area. By means of the method, the cooking fume concentration of the furnace end area is detected, interference existing in the first type of user cooking actions is eliminated, detection information of the cooking fume concentration is more real-time and accurate, and the method is closer to the actual use requirement.

Description

Technical Field

[0001] This invention relates to the field of smart home technology, and in particular to a control method and a fume purification device. Background Technology

[0002] As an essential household appliance in modern kitchens, range hoods effectively remove cooking fumes, improving the quality of the kitchen environment. With the continuous development of smart home technology, range hoods are gradually upgrading towards intelligence and automation, and their functions are becoming increasingly diverse. Among these advancements, automatic start / stop and airflow adjustment based on fume concentration have become important development directions for intelligent range hoods.

[0003] Most smart range hoods on the market today detect the concentration of cooking fumes in the kitchen using fume sensors and execute corresponding control logic based on this information. However, most of these detection solutions only perform a uniform detection of the overall kitchen environment. Even when detecting fumes at the burner area of ​​the stove, they cannot avoid interference from the user's cooking actions, resulting in poor accuracy and real-time performance. They also cannot distinguish the cooking status and fume production of different burners, making it difficult to directly and clearly reflect the amount of fumes generated during the current cooking process.

[0004] Because precise detection of cooking fumes in the burner area is impossible, smart range hoods struggle to perform refined and targeted airflow adjustments and intelligent control, impacting both smoke extraction efficiency and user experience. Therefore, current technologies still suffer from low detection accuracy and crude control methods, failing to meet users' demands for efficient, precise, and intelligent smoke extraction. Summary of the Invention

[0005] This invention provides a control method and a fume purification device for detecting the concentration of oil fumes in the burner area. It also eliminates the interference signal intensity corresponding to the first type of user cooking action from the signal intensity of the reflected light signal, making the detection information of oil fume concentration more real-time and accurate, and closer to the needs of actual use.

[0006] In a first aspect, embodiments of the present invention provide a control method for an oil fume purification device, the oil fume purification device including a fume collection hood housing and an oil fume detection module; the fume collection hood housing is disposed above a stove, and the oil fume detection module is disposed on the side of the fume collection hood housing facing the burner of the stove; the oil fume detection module is disposed facing the corresponding burner. The control method includes: The oil fume detection module emits a detection light signal toward the corresponding burner head, and the target light curtain detection area formed by the oil fume detection module is aligned with the burner head area. It also receives the light signal reflected back by the oil fume particles corresponding to the burner head and defines it as a reflected light signal. Based on the signal intensity of the reflected light signal, a first type of user cooking action is identified; wherein, the first type of user cooking action includes at least waving hand action, placing and moving the pot, and placing and taking the lid off the pot. Within the duration range corresponding to the first type of user cooking action, the intensity of the interference signal corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal in order to detect the oil fume concentration in the detection area of ​​the target light curtain formed accordingly.

[0007] Optionally, based on the signal intensity of the reflected light signal, the presence of a first type of user cooking action is identified, including: The rate of change of the signal intensity of the reflected light signal is determined based on the signal intensity of the reflected light signal. When the rate of change of the signal intensity of the reflected light signal is greater than or equal to a preset rate of change threshold, a first duration is obtained within a first preset time range; wherein, the first duration is the duration during which the rate of change of the signal intensity of the reflected light signal is greater than or equal to the preset rate of change threshold; When the first duration is less than a preset duration threshold, it is determined that the first type of user cooking action exists.

[0008] Optionally, after obtaining a first duration within a first preset time range when the signal intensity change rate of the reflected light signal is greater than or equal to a preset change rate threshold, the method further includes: When the first duration is greater than or equal to the preset duration threshold, it is determined that there is a second type of user cooking action; wherein, the second type of user cooking action includes at least a stir-frying action; Within the duration of the second type of user cooking action, the target oil fume concentration within the target light curtain detection area is determined based on the signal intensity of the reflected light signal and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration.

[0009] Optionally, within the duration range corresponding to the first type of user cooking action, the interference signal intensity corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal to detect the oil fume concentration within the detection area of ​​the corresponding target light curtain, including: The signal intensity of the reflected light signal corresponding to the start time of the duration range corresponding to the first type of user cooking action is obtained and defined as the target signal intensity; Modify the signal intensity of the reflected light signal at each time point between the start and end time of the duration range corresponding to the first type of user cooking action to the target signal intensity; Within the duration of the first type of user cooking action, the target oil fume concentration within the corresponding target light curtain detection area is determined based on the target signal intensity and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration.

[0010] Optionally, after the fume detection module emits a detection light signal toward the corresponding burner head, and the target light curtain detection area formed by the fume detection module is aligned with the burner head area, and after receiving the light signal reflected back by the fume particles corresponding to the burner head and defining it as a reflected light signal, the method further includes: Based on the signal intensity of the reflected light signal, it is determined that there is no user cooking action; Based on the signal intensity of the reflected light signal and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration, the target oil fume concentration within the corresponding target light curtain detection area is determined.

[0011] Optionally, identifying the absence of user cooking action based on the signal intensity of the reflected light signal includes: The rate of change of the signal intensity of the reflected light signal is determined based on the signal intensity of the reflected light signal. When the rate of change of the reflected light signal intensity is less than a preset rate of change threshold, it is determined that the user's cooking action does not exist.

[0012] Optionally, after identifying the presence of a first type of user cooking action based on the signal intensity of the reflected light signal, the method further includes: Determine the action type of the first type of user's cooking action; A database of user cooking habits is constructed based on the duration range and time sequence corresponding to each of the described action types.

[0013] In a second aspect, embodiments of the present invention also provide an oil fume purification device for performing the control method of the oil fume purification device as described in any one of the first aspects; The fume purification device includes a fume collection hood housing, a fume detection module, and a controller; the fume collection hood housing is positioned above the stove, and the fume detection module is positioned on the side of the fume collection hood housing facing the burner of the stove; the fume detection module is positioned facing the corresponding burner. The controller is electrically connected to the fume detection module. The controller is used to emit detection light signals towards the corresponding burner head using the fume detection module, and the target light curtain detection area formed by the fume detection module is aligned with the burner head area. The controller also receives light signals reflected back from the fume particles corresponding to the burner head and defines them as reflected light signals. Based on the signal intensity of the reflected light signals, the controller identifies the presence of a first type of user cooking action. The first type of user cooking action includes at least waving, placing and moving the pot, and placing and removing the lid. Within the duration of the first type of user cooking action, the controller excludes the interference signal intensity corresponding to the first type of user cooking action from the signal intensity of the reflected light signals to detect the fume concentration within the target light curtain detection area.

[0014] Optionally, the fume detection module includes a signal transmitter, a first optical lens assembly, and a signal receiver; The signal transmitter is used to emit an initial light signal toward the corresponding furnace head; The first optical lens assembly is located on the propagation path of the initial light signal. The first optical lens assembly is used to collimate the initial light signal to obtain a parallel-emitted detection light signal, and accordingly forms the target light curtain detection area. The signal receiver is used to receive light signals reflected back by the oil fume particles corresponding to the burner head.

[0015] Optionally, the stove is provided with two burners, and the fume collection hood housing is provided with two oil fume detection modules; The two oil fume detection modules are respectively positioned facing the two burners. The two oil fume detection modules alternately emit detection light signals towards the two burners and receive light signals reflected back by the oil fume particles corresponding to the burners.

[0016] This invention provides a control method and a fume purification device, which includes a fume collection hood housing and a fume detection module. The fume collection hood housing is positioned above the stove, and the fume detection module is positioned on the side of the fume collection hood housing facing the burner of the stove. The fume detection module is oriented towards the corresponding burner. The control method first uses the fume detection module to emit a detection light signal towards the corresponding burner, and the target light curtain detection area formed by the fume detection module is aligned with the burner area. It also receives the light signal reflected back by the fume particles corresponding to the burner and defines it as a reflected light signal. Then, based on the signal intensity of the reflected light signal, it identifies the presence of a first type of user cooking action. The first type of user cooking action includes at least waving, placing and moving the pot, and placing and removing the lid. Finally, within the duration of the first type of user cooking action, the interference signal intensity corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal to detect the fume concentration within the target light curtain detection area. By utilizing the aforementioned lower-cost and simpler method, the concentration of oil fumes in the burner area is detected, which means detecting the concentration of oil fumes generated at the source during cooking. When a first type of cooking action is present, the interference signal intensity corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal. Then, the oil fume concentration in the target light curtain detection area is determined based on the signal intensity of the reflected light signal after interference is excluded. The oil fume concentration detection information is more real-time and accurate, and is closer to the needs of actual use. It greatly improves the real-time performance and accuracy of oil fume detection, enabling oil fume purification equipment to achieve refined and targeted intelligent control, and improving the smoke extraction effect and user experience. In other words, the target light curtain detection area formed by the fume detection module is aligned with the corresponding burner area. The signal emitted by the fume detection module will be concentrated at the corresponding burner area. At this time, the fume purification equipment can directly obtain the fume situation generated by the corresponding burner during cooking. It has the effect of eliminating the first type of user cooking actions. The signals generated by the user's normal activities during cooking (arm waving, stirring of ingredients, etc.) have been processed to a certain extent, which can effectively eliminate the signal disturbances generated by human activities. That is, the detection result of fume concentration will not be affected by the first type of cooking actions in the actual cooking process of the user. The detection of fume concentration in the specific burner area is more accurate and can accurately capture the source of fume generation. It is more suitable for large-scale application in actual fume purification equipment products.

[0017] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of the present invention, nor is it intended to limit the scope of the invention. Other features of the invention will become readily apparent from the following description. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the target light curtain detection area formed by the fume purification device and fume detection module provided in an embodiment of the present invention; Figure 2 This is a schematic flowchart of a control method for an oil fume purification device provided in an embodiment of the present invention; Figure 3 This is a schematic diagram illustrating signal interference caused by a user's cooking actions when using a stainless steel spatula, according to an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating signal interference caused by a user's cooking actions during a simple hand gesture, as provided in an embodiment of the present invention. Figure 5 This is a schematic diagram illustrating signal interference caused by a user's cooking actions, both momentarily and subsequently, when covering a pot with different lids, according to an embodiment of the present invention. Figure 6 This is a schematic flowchart of another control method for an oil fume purification device provided in an embodiment of the present invention; Figure 7 This is a flowchart illustrating another control method for an oil fume purification device provided in an embodiment of the present invention; Figure 8 This is a flowchart illustrating another control method for an oil fume purification device provided in an embodiment of the present invention; Figure 9 This is a flowchart illustrating another control method for an oil fume purification device provided in an embodiment of the present invention; Figure 10 This is a flowchart illustrating another control method for an oil fume purification device provided in an embodiment of the present invention; Figure 11 This is a schematic diagram of the structure of an oil fume detection module provided in an embodiment of the present invention; Figure 12 This is a schematic diagram of light transmission in a first optical lens assembly provided in an embodiment of the present invention. Detailed Implementation

[0020] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] Figure 1 This is a schematic diagram of the structure of the target light curtain detection area formed by the fume purification device and fume detection module provided in an embodiment of the present invention. Figure 2 This is a flowchart illustrating a control method for an oil fume purification device provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the fume purification device includes a fume collection hood housing 10 and a fume detection module 20. The fume collection hood housing 10 is positioned above the cooktop 30, and the fume detection module 20 is positioned on the side of the fume collection hood housing 10 facing the burner 31 of the cooktop 30. The fume detection module 20 is oriented towards the corresponding burner 31. The control method of this fume purification device is applicable when the user's cooking actions interfere with the fume detection module's detection results regarding fume concentration. The control method of this fume purification device can be executed by the fume purification device itself. Figure 2 As shown, the control method includes: S110. The oil fume detection module emits a detection light signal toward the corresponding burner head, and the target light curtain detection area formed by the oil fume detection module is aligned with the burner head area, and receives the light signal reflected back by the corresponding oil fume particles of the burner head, and defines it as a reflected light signal.

[0023] Specifically, please refer to Figure 1The fume purification device includes a fume hood housing 10 and an oil fume detection module 20. The fume hood housing 10 can collect and gather oil fume gases from the environment to purify it. The oil fume detection module 20 can detect the oil fume concentration in a corresponding area, such as the oil fume concentration within the target light curtain detection area 40. It is understood that the specific structure of the fume purification device mentioned in this embodiment is similar to that of traditional fume purification devices (such as range hoods), with the main difference being that the oil fume detection module 20 is installed at the bottom of the fume hood housing 10. Figure 1 The installation position of the fume detection module 20 relative to the fume collection hood housing 10 shown is only an example and is not limited. The actual installation position of the fume detection module 20 can be adjusted according to the specific model of the fume purification equipment and the shape and volume of the fume collection hood housing 10.

[0024] During the installation of the fume purification equipment, the fume collection hood housing 10 needs to be placed above the stove 30, and the fume detection module 20 needs to be placed on the side of the fume collection hood housing 10 facing the burner 31 of the stove 30. The fume detection module 20 should be positioned so that it faces the burner 31 of the stove 30, ensuring that the target light curtain detection area 40 formed by the fume detection module 20 is aligned with the burner 31 area of ​​the stove 30. This allows the fume detection module 20 to directly detect the source area of ​​the fumes generated during cooking, and subsequently, real-time acquisition and judgment of the fume concentration within the target light curtain detection area 40 can be achieved. For example, the fume detection module 20 and the burner 31 can have a one-to-one correspondence; that is, the fume detection module 20 can be set to correspond to one burner 31 below the fume purification equipment. For example, Figure 1 The number of fume detection modules 20 shown can be two, and the number of burners 31 of the stove 30 can also be two. One fume detection module 20 is set corresponding to the left burner 31, that is, this fume detection module 20 can detect the fume concentration corresponding to the area of ​​the left burner 31. The other fume detection module 20 is set corresponding to the right burner 31, that is, this fume detection module 20 can detect the fume concentration corresponding to the area of ​​the right burner 31. Furthermore, this embodiment only exemplarily illustrates the target light curtain detection area 40 formed by the fume detection module 20 corresponding to the area of ​​the left burner 31. The target light curtain detection area 40 formed by the fume detection module 20 corresponding to the area of ​​the right burner 31 can be obtained according to a symmetrical relationship.

[0025] The fume detection module 20 can emit detection light signals towards the corresponding burner head 31, providing detection light signals for fume detection. It can also form a stable target light curtain detection area 40 above the corresponding burner head 31, ensuring that this target light curtain detection area 40 covers the main path of fume generation and rise during cooking, thus guaranteeing the accuracy of subsequent fume concentration detection. For example, when fume particles generated during cooking enter the target light curtain detection area 40, these particles will change the propagation direction of the detection light signal, such as scattering or reflecting it. The fume detection module 20 can also receive the light signals reflected back by the fume particles and define them as reflected light signals, so that the fume concentration within the target light curtain detection area 40 can be indirectly determined based on the received reflected light signals. In this way, accurate detection of the fume concentration generated at the source during cooking is achieved for a specific burner head 31 area.

[0026] Furthermore, the target light curtain detection area 40 formed by the oil fume detection module 20 has its orthographic projection on the plane of the cooktop 30 located within the orthographic projection of the corresponding burner 31 on the plane of the cooktop 30. Therefore, when the target light curtain detection area 40 formed by the oil fume detection module 20 is aligned with the corresponding burner 31 area, the signal emitted by the oil fume detection module 20 will be concentrated on the corresponding burner 31 area. At this time, the oil fume purification equipment can directly obtain the oil fume situation generated by the corresponding burner 31 during cooking, making the detection of oil fume concentration in the specific burner 31 area more accurate. This allows for precise capture of the source of oil fume generation, reduces interference from external airflow and the environment, and improves the targeting and reliability of oil fume detection. For example, Figure 1 The orthographic projection of the target light curtain detection area 40 on the plane of the stove 30 overlaps exactly with the orthographic projection of the corresponding burner 31 on the plane of the stove 30. Of course, the area of ​​the orthographic projection of the target light curtain detection area 40 on the plane of the stove 30 can be smaller than the area of ​​the orthographic projection of the corresponding burner 31 on the plane of the stove 30, and the orthographic projection of the target light curtain detection area 40 on the plane of the stove 30 can also be located within the orthographic projection of the corresponding burner 31 on the plane of the stove 30. For example, the center of the orthographic projection of the target light curtain detection area 40 on the plane of the stove 30 can coincide with the center of the orthographic projection of the corresponding burner 31 on the plane of the stove 30, or they can not coincide.

[0027] S120. Based on the signal intensity of the reflected light signal, identify the existence of a first type of user cooking action; wherein, the first type of user cooking action includes at least waving hand action, placing and moving the pot, and placing and taking the lid off the pot.

[0028] First, it should be noted that this solution primarily eliminates interference signals corresponding to at least some user cooking actions by detecting and verifying the reflected light signal. In other words, before actually calculating the oil fume concentration within the target light curtain detection area, it is necessary to eliminate interference signal values ​​generated by at least some user cooking actions, such as the interference signal values ​​corresponding to the first type of user cooking action. Specifically, the identification of the first type of user cooking action can be determined by the abrupt change in the signal intensity of the received reflected light signal, and can also be achieved through extensive testing to obtain the signal intensity values ​​generated by the actual cooking actions.

[0029] Figure 3 This is a schematic diagram illustrating signal interference caused by cooking actions performed by a user using a stainless steel spatula, provided in an embodiment of the present invention. Figure 4 This is a schematic diagram illustrating signal interference caused by cooking actions during a user's simple hand gesture, as provided in an embodiment of the present invention. Figure 5 This is a schematic diagram illustrating signal interference caused by a user's cooking actions, both momentarily and subsequently, when handling different pot lids, according to an embodiment of the present invention. Figure 3 , Figure 4 and Figure 5 As shown in the figure, the curves displayed represent the changes in the signal intensity of the reflected light signal detected by the fume detection module in the fume purification device and the calculated fume concentration value during the user's actual cooking process. (In each figure, the red line represents the signal intensity, the blue line represents the fume concentration, the boxes represent the curve changes when the user performs various cooking actions, and the left stove secondary signal is a simplified description of the reflected light signal corresponding to the left stove head. The AD value of the secondary signal on the left vertical axis is a simplified description of the digital value of the reflected light signal corresponding to the left stove head. The smoke concentration on the left stove is a simplified description of the fume concentration corresponding to the left stove head. The concentration on the right vertical axis is a simplified description of the digital value of the fume concentration corresponding to the left stove head. The horizontal axis is the time axis. In this embodiment, only the data of the left stove head is used as an example for illustration. The data of the right stove head will not be repeated.) The human actions of users during actual cooking can be basically divided into the following categories: waving gestures, placing / moving the pan, placing / removing the lid, and stirring. Except for stirring, the cooking signals generated by the other human actions all exhibit large signal change amplitudes and short periods. Therefore, corresponding settings can be made in the fume purification equipment. If a signal meeting the condition of "large signal change rate and short signal change period" is detected during fume detection, it is considered a signal of the first category of user cooking actions and is subsequently excluded. For example, the first category of user cooking actions includes at least waving gestures, placing / moving the pan, and placing / removing the lid. Of course, the first category of user cooking actions can also include other human actions, which will not be listed in detail in this embodiment.

[0030] At the same time, from Figure 3 , Figure 4 and Figure 5From the changes in signal intensity of the signal curves under different actions, certain patterns can be summarized. For example, when a user places or moves a pot, the signal intensity value of the reflected light signal fluctuates up and down, and the fluctuation range is large. For example, when a user waves their hand, the signal intensity value of the reflected light signal also fluctuates up and down, but the fluctuation range is relatively small. Moreover, depending on the user's waving method, the fluctuation range of the signal intensity value also varies. In this case, some reflected light signals with excessively small fluctuation ranges can be ignored (if the signal fluctuation range is too small, its interference with oil fume detection is also small, and its impact on the calculation of oil fume concentration is not significant, so it can be ignored). For example, when a user places or removes a pot lid, and the lid is made of opaque wood, the detection light signal emitted by the fume detection module 20 cannot penetrate the lid because it is opaque. In this case, the detection light signal is emitted directly onto the lid. When the user removes the lid, the detection light signal is emitted directly back into the pot. Due to the difference in material and signal transmission distance, the signal intensity of the reflected light received by the fume detection module 20 will fluctuate upwards before generally increasing. Conversely, when the user places the lid back on, the detection light signal is emitted directly back onto the lid, and the signal intensity of the reflected light received by the fume detection module 20 will fluctuate upwards before generally decreasing. For example, when a user places or removes a pot lid, and the lid is made of transparent glass, the detection light signal emitted by the fume detection module 20 will pass through the lid and be directly emitted into the pot. Furthermore, the glass material itself has minimal interference with the signal strength of the emitted light signal. Therefore, the signal strength of the reflected light signal received by the fume detection module 20 when the lid is removed will only fluctuate slightly, without a significant overall change. Conversely, when a user places or removes a pot lid, and the lid is made of a combination of glass and stainless steel, the detection light signal emitted by the fume detection module 20 will also pass through the lid and be directly emitted into the pot. However, because the stainless steel material itself has significant interference with the signal strength of the emitted light signal, the signal strength of the reflected light signal received by the fume detection module 20 when the lid is removed will experience a larger upward fluctuation, but still without a significant overall change.For example, when a user stirs the food, the cycle of this stir-frying action is often long, and the frequency of the user's movements during the stir-frying process is high. At this time, the signal intensity of the reflected light signal received by the oil fume detection module 20 will fluctuate upward for a long time, and the amplitude of the fluctuation is not stable, sometimes large and sometimes small. It is not convenient to directly exclude the signal. However, since a lot of oil fumes are generated when the food is stir-fried, the user's stir-frying process can be regarded as a high oil fume situation. There is no need to exclude the signal, and it will not affect the overall process of oil fume detection and the accuracy of the detection results.

[0031] Based on the above, during the user's actual cooking process, the changes in the signal intensity of the reflected light signal received by the fume detection module can be used to infer the user's current actions. For example, if a cooking action signal is detected, and this signal exhibits characteristics of "signal intensity fluctuating widely," then it can be determined that the user is placing / moving the pot. For signals that are difficult to identify directly, such as those with "signal intensity fluctuating widely," the signal may correspond to either waving or placing / removing a pot lid. Furthermore, to confirm the specific signal type, it needs to be compared with preset signals. For instance, the fume purification device's database stores signal fluctuations generated by various types of cooking actions. This data is pre-acquired through numerous actual cooking actions. The fume purification device compares and analyzes the current signal with the corresponding signal data in the database to find the signal data closest to the current cooking action, thereby determining the specific type of cooking action the user is currently performing.

[0032] Furthermore, by acquiring signals corresponding to these cooking actions, the fume purification equipment can understand the user's actions at various points in time during the entire recipe execution process, as well as the frequency of each cooking action. This user data can be fed back into the fume purification equipment, allowing it to better understand the user's cooking habits. The cooking action data generated during this cooking session can also be input into the fume purification equipment's database, enriching the database and facilitating data comparison in subsequent recipe cooking.

[0033] Specifically, the presence of a first type of user cooking action can be identified based on the signal intensity of the reflected light signal. It is understandable that different cooking actions result in varying distances, angles, and obstructions to the reflecting surface, leading to unique patterns in the intensity of the reflected light signal: waving hands correspond to rapid fluctuations in signal intensity with a short duration; placing or moving the pot is accompanied by a sudden increase in signal intensity followed by stabilization (placing the pot) or slow fluctuations (moving the pot); placing or removing the lid results in a sudden change in signal intensity followed by a return to the initial baseline value. Thus, accurate identification can be achieved based on the signal variation patterns corresponding to the first type of user cooking action, or by comparing data from a database corresponding to the first type of user cooking action. Furthermore, accurate identification of the corresponding first type of user cooking action provides a reliable trigger for the intelligent control of the fume purification equipment, improving the convenience and intelligence of cooking operations.

[0034] S130. Within the duration range corresponding to the cooking action of the first type of user, the intensity of the interference signal corresponding to the cooking action of the first type of user is excluded from the signal intensity of the reflected light signal in order to detect the concentration of oil fume in the detection area of ​​the target light curtain formed accordingly.

[0035] Specifically, in the process of monitoring oil fume concentration using the signal intensity of reflected light signals, user cooking actions such as waving hands, placing or moving pots, and removing or placing lids can cause instantaneous changes in the signal intensity of reflected light signals, forming interference signals unrelated to oil fume concentration detection and easily leading to misjudgments of oil fume concentration. Therefore, oil fume purification equipment can first identify the existence of the first type of user cooking actions and lock in the corresponding duration range. Within the duration range corresponding to the first type of user cooking actions, the interference signal intensity corresponding to the first type of user cooking actions is excluded from the signal intensity of the reflected light signals received by the oil fume detection module. This can effectively eliminate non-oil fume factors caused by human actions during the cooking process, as well as the resulting signal fluctuations, from affecting the accuracy of oil fume concentration detection results. It can also improve the signal-to-noise ratio and stability of reflected light signals, thereby accurately reflecting the true oil fume concentration within the target light curtain detection area. This provides reliable data support for subsequent oil fume monitoring, intelligent smoke control, and other functions, improving the accuracy and robustness of intelligent monitoring of the cooking environment.

[0036] This means retaining only the signal intensity of the effective light signal formed by the scattering and absorption of oil fume particles. Subsequently, the oil fume concentration within the target light curtain detection area can be determined based on this effective light signal intensity, making the detection of oil fume concentration more accurate. For example, a preset mapping relationship exists between the signal intensity of the effective light signal and the oil fume concentration. Therefore, the oil fume concentration within the corresponding target light curtain detection area can be determined based on the signal intensity of the effective light signal and this preset mapping relationship. For example, after determining the oil fume concentration within the target light curtain detection area, reliable data support can be provided for the automatic speed adjustment, intelligent start / stop, and airflow regulation control logic of the oil fume purification equipment, thereby improving kitchen exhaust efficiency, reducing energy consumption and noise, and achieving intelligent and automated management of the cooking environment.

[0037] The technical solution in this embodiment of the invention detects the concentration of oil fumes in the burner area, that is, detects the concentration of oil fumes generated at the source during cooking. When a first type of cooking action exists, the interference signal intensity corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal. Then, the oil fume concentration in the target light curtain detection area is determined based on the signal intensity of the reflected light signal after the interference is excluded. The oil fume concentration detection information is more real-time and accurate, and is closer to the needs of actual use. It greatly improves the real-time performance and accuracy of oil fume detection, enabling the oil fume purification equipment to achieve refined and targeted intelligent control, and improving the smoke exhaust effect and user experience. In other words, the target light curtain detection area formed by the fume detection module is aligned with the corresponding burner area. The signal emitted by the fume detection module will be concentrated at the corresponding burner area. At this time, the fume purification equipment can directly obtain the fume situation generated by the corresponding burner during cooking. It has the effect of eliminating the first type of user cooking actions. The signals generated by the user's normal activities during cooking (arm waving, stirring of ingredients, etc.) have been processed to a certain extent, which can effectively eliminate the signal disturbances generated by human activities. That is, the detection result of fume concentration will not be affected by the first type of cooking actions in the actual cooking process of the user. The detection of fume concentration in the specific burner area is more accurate and can accurately capture the source of fume generation. It is more suitable for large-scale application in actual fume purification equipment products.

[0038] Optionally, after identifying the existence of a first type of user cooking action based on the signal intensity of the reflected light signal, the method further includes: determining the action type of the first type of user cooking action; and constructing a user cooking habit database based on the duration range and time sequence corresponding to each action type.

[0039] Specifically, after acquiring data such as the duration, intensity, and rate of change of cooking action signals, the fume purification equipment can identify the possible type of cooking action based on the various characteristics of the signal. For example, if the signal intensity fluctuates widely, it is likely caused by the user placing / moving the pan. The acquired cooking action signal data can then be compared with information in a cooking action database. This database stores a large number of signals generated by various types of cooking actions, encompassing most of the signals generated by users during actual cooking. By comparing the data and finding the information data closest to the acquired cooking action signal, the type of actual cooking action performed by the user can be determined. In other words, the fume purification equipment's cooking action database stores a large number of signal curves generated by various types of cooking actions, and by summarizing and analyzing the characteristics of these signals, it is possible to understand what kind of cooking action the user is currently performing. For example, the fume purification equipment can detect the concentration of oil fumes during actual cooking. It can determine whether a first type of user cooking action has occurred based on the change in the signal intensity of the received reflected light signal, and can eliminate the signal generated by the first type of user cooking action, thereby making the detection result of the oil fume concentration more accurate.

[0040] Furthermore, by collecting data on cooking actions throughout the entire cooking process, the fume purification device can understand the timing and frequency of each cooking action performed by the user at different stages of the recipe's preparation, thus providing a better understanding of the user's cooking habits. For example, it can track when the user moves the pan, when they add ingredients, and when they open the lid. In other words, the fume purification device can record every cooking action performed by the user throughout the entire cooking process and identify which action they are performing. This data is then fed into the user's cooking habit database, facilitating better service for the user in the future. In addition, for example, the fume purification device can also determine whether the user is cooking through human body recognition and stove-hood linkage, and automatically switch the operating mode of the range hood accordingly, further improving the user experience and cooking comfort.

[0041] Figure 6 This is a flowchart illustrating another control method for an oil fume purification device provided in an embodiment of the present invention. This embodiment is an optimization based on the above embodiment. Optionally, based on the signal intensity of the reflected light signal, the presence of a first type of user cooking action is identified, including: Determine the rate of change of the reflected light signal intensity based on the signal intensity of the reflected light signal; When the rate of change of the signal intensity of the reflected light signal is greater than or equal to a preset rate of change threshold, a first duration is obtained within a first preset time range; wherein, the first duration is the duration during which the rate of change of the signal intensity of the reflected light signal is greater than or equal to the preset rate of change threshold; When the first duration is less than a preset duration threshold, it is determined that there is a first type of user cooking action.

[0042] For details not covered in this embodiment, please refer to the above embodiments. Figure 6 As shown, the control method includes: S210. The oil fume detection module emits a detection light signal toward the corresponding burner head, and the target light curtain detection area formed by the oil fume detection module is aligned with the burner head area, and receives the light signal reflected back by the corresponding oil fume particles of the burner head, and defines it as a reflected light signal.

[0043] S220. Determine the rate of change of the reflected light signal intensity based on the signal intensity of the reflected light signal.

[0044] Specifically, the fume detection module can record the signal intensity S of the current reflected light signal every time t0. n At this time, the signal intensity S of the reflected light signal n The corresponding time point is denoted as t. n The rate of change of the signal intensity of the corresponding reflected light signal can be denoted as k. n And satisfy k n =|S n -S n-1 | / t0, where S n-1 This represents the signal strength of the previously recorded reflected light signal. It can be understood that the rate of change of the reflected light signal's signal strength can also reflect the fluctuations in its intensity; for example, the larger the rate of change, the greater the fluctuation in the reflected light signal's signal strength.

[0045] S230. When the rate of change of the signal intensity of the reflected light signal is greater than or equal to a preset rate of change threshold, a first duration is obtained within a first preset time range; wherein, the first duration is the duration during which the rate of change of the signal intensity of the reflected light signal is greater than or equal to the preset rate of change threshold.

[0046] The preset rate of change threshold is a pre-set value that corresponds to the airflow level of the fume purification device. This preset rate of change threshold is not static. For example, when the fume purification device is operating at its highest setting (like the stir-fry setting), the concentration of fumes at the stove is high, resulting in significant changes or fluctuations in the intensity of the reflected light signal. If the preset rate of change threshold is set too low, misjudgment may occur, mistaking normal changes in fumes for cooking signals. Therefore, the preset rate of change threshold can be appropriately increased when the fume purification device is operating at its highest setting (like the stir-fry setting) and appropriately decreased when it is operating at its lowest setting (like the low setting). Specifically, when the rate of change of the reflected light signal intensity is greater than or equal to the preset rate of change threshold, it indicates potential signal interference from user cooking actions, and the signal intensity of the reflected light signal and the corresponding rate of change of the reflected light signal within a first preset time range need to be fed back to the fume purification device. Furthermore, it is also necessary to obtain a first duration within a first preset time range to determine the duration from the moment when the rate of change of the reflected light signal intensity is greater than or equal to a preset rate of change threshold until the moment when the rate of change of the reflected light signal intensity is less than the preset rate of change threshold. This first duration can then be used to further analyze whether the user's cooking actions exist. The first preset time range can be reasonably selected and set according to the actual needs of detecting oil fume concentration. The first duration must fall within the first preset time range, and the duration corresponding to the first duration must be less than or equal to the total duration of the first preset time range.

[0047] S240. When the first duration is less than a preset duration threshold, it is determined that there is a first type of user cooking action.

[0048] The preset duration threshold is a pre-set value related to the fluctuation of the duration corresponding to the cooking action of the first type of user. Specifically, when the first duration is less than the preset duration threshold, it indicates that the fluctuation of the signal corresponding to the cooking action is relatively short, corresponding to the cooking action of the first type of user. Furthermore, once the existence of the cooking action of the first type of user is clearly determined, the interference signal intensity corresponding to the cooking action of the first type of user needs to be promptly excluded from the signal intensity of the reflected light signal to ensure the accuracy and reliability of the detection results of the oil fume concentration within the corresponding target light curtain detection area.

[0049] S250, within the duration range corresponding to the cooking action of the first type of user, the intensity of the interference signal corresponding to the cooking action of the first type of user is excluded from the signal intensity of the reflected light signal, so as to detect the oil fume concentration in the detection area of ​​the target light curtain formed accordingly.

[0050] Optionally, when the rate of change of the reflected light signal intensity is greater than or equal to a preset rate of change threshold, after obtaining the first duration within a first preset time range, the method further includes: when the first duration is greater than or equal to a preset duration threshold, determining that there is a second type of user cooking action; wherein the second type of user cooking action includes at least a stir-frying action; within the duration range corresponding to the second type of user cooking action, determining the target oil fume concentration within the corresponding target light curtain detection area based on the signal intensity of the reflected light signal and a preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration.

[0051] Specifically, when the first duration is greater than or equal to a preset duration threshold, it indicates that the signal fluctuation corresponding to the cooking action has a relatively long duration, corresponding to the second type of user cooking action. It is understandable that during the user's stir-frying action, although the detected reflected light signal intensity will be high, the process of stir-frying the food in the pan naturally generates a large amount of oil fumes, meaning the oil fume concentration is already high. The user's stir-frying action does not significantly interfere with the actual reflected light signal intensity. Furthermore, the high frequency of the user's stir-frying action makes it difficult to eliminate interference. Therefore, it is not necessary to eliminate interference signal intensity corresponding to the second type of user cooking action at this time. Subsequently, the target oil fume concentration within the corresponding target light curtain detection area can be determined directly based on the reflected light signal intensity and the preset mapping relationship between the reflected light signal intensity and the oil fume concentration. The preset mapping relationship between the reflected light signal intensity and the oil fume concentration is pre-set, indicating a corresponding relationship between the reflected light signal intensity and the oil fume concentration. For any known reflected light signal intensity, a unique oil fume concentration value can be determined. Furthermore, once the existence of a second type of user cooking action is clearly determined, it is not necessary to exclude the interference signal intensity corresponding to the second type of user cooking action from the signal intensity of the reflected light signal. In other words, the interference signal intensity corresponding to the second type of user cooking action will not affect the detection result of the corresponding oil fume concentration, thus ensuring the accuracy and reliability of the detection result of the oil fume concentration in the corresponding target light curtain detection area.

[0052] It should also be noted that S230 is the step of obtaining the first duration within the first preset time range, which corresponds to two parallel schemes. On the one hand, S240 and S250 determine the existence of a first type of user cooking action based on the first duration, and subsequently, within the duration corresponding to the first type of user cooking action, exclude the interference signal intensity corresponding to the first type of user cooking action from the signal intensity of the reflected light signal to obtain an accurate detection result of the oil fume concentration. On the other hand, the local first duration determines the existence of a second type of user cooking action, and subsequently, within the duration corresponding to the second type of user cooking action, it is not necessary to exclude the interference signal intensity corresponding to the second type of user cooking action from the signal intensity of the reflected light signal; instead, an accurate detection result of the oil fume concentration is directly obtained.

[0053] Figure 7 This is a flowchart illustrating another control method for an oil fume purification device provided in this embodiment of the invention. This embodiment is an optimization based on the above embodiment. Optionally, within the duration range corresponding to the first type of user cooking action, the interference signal intensity corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal to detect the oil fume concentration within the detection area of ​​the corresponding target light curtain, including: The signal intensity of the reflected light signal corresponding to the start time of the duration range of the first type of user cooking action is obtained and defined as the target signal intensity; Modify the signal intensity of the reflected light signal at each moment between the start and end times of the duration range corresponding to the first type of user cooking action to the target signal intensity; Within the duration of the first type of user's cooking action, the target oil fume concentration within the corresponding target light curtain detection area is determined based on the target signal intensity and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration.

[0054] For details not covered in this embodiment, please refer to the above embodiments. Figure 7 As shown, the control method includes: S310. The oil fume detection module emits a detection light signal toward the corresponding burner head, and the target light curtain detection area formed by the oil fume detection module is aligned with the burner head area. It also receives the light signal reflected back by the oil fume particles corresponding to the burner head and defines it as a reflected light signal.

[0055] S320. Based on the signal intensity of the reflected light signal, identify the existence of a first type of user cooking action; wherein, the first type of user cooking action includes at least waving hand action, placing and moving the pot, and placing and taking the lid off the pot.

[0056] S330. Obtain the signal intensity of the reflected light signal corresponding to the start time of the duration range corresponding to the first type of user cooking action, and define it as the target signal intensity.

[0057] Specifically, this embodiment essentially describes the process of eliminating the interference signal intensity corresponding to the first type of user cooking action from the signal intensity of the reflected light signal. The oil fume detection module can record the current signal intensity S of the reflected light signal every time t0. n This is to enable the rapid acquisition of the signal intensity of the corresponding reflected light signal at the start of the duration range corresponding to the cooking action of the first type of user, and to define it as the target signal intensity.

[0058] S340. Modify the signal intensity of the reflected light signal corresponding to each moment between the start and end times of the duration range corresponding to the first type of user cooking action to the target signal intensity.

[0059] Specifically, the signal intensity of the reflected light signal at each moment within the duration range corresponding to the first type of user cooking action is modified to the target signal intensity. In other words, the target signal intensity is assigned to each moment within the duration range corresponding to the first type of user cooking action. This can also be understood as recording the signal intensity of the reflected light signal at each moment within the duration range corresponding to the first type of user cooking action based on the signal intensity before the occurrence of the cooking action. In this way, signal interference caused by the first type of user cooking action can be eliminated, that is, abnormal fluctuations in signal intensity within the duration range corresponding to the first type of user cooking action can be eliminated.

[0060] S350, within the duration range corresponding to the cooking action of the first type of user, the target oil fume concentration within the corresponding target light curtain detection area is determined according to the target signal intensity and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration.

[0061] Specifically, within the duration of the first type of user cooking action, the target oil fume concentration within the corresponding target light curtain detection area can be indirectly determined based on the target signal intensity and the preset mapping relationship between the reflected light signal intensity and the oil fume concentration. The preset mapping relationship between the reflected light signal intensity and the oil fume concentration is pre-set, indicating a corresponding relationship between them. For any known reflected light signal intensity, a unique oil fume concentration value can be determined. The target signal intensity refers to the signal intensity at the specific moment corresponding to the start of the duration of the first type of user cooking action, which also satisfies the preset mapping relationship. That is, when the existence of a first type of user cooking action is clearly determined, the interference signal intensity corresponding to this action needs to be promptly excluded from the reflected light signal intensity to ensure the accuracy and reliability of the oil fume concentration detection results within the corresponding target light curtain detection area.

[0062] Figure 8 This is a flowchart illustrating another control method for an oil fume purification device provided in this embodiment of the invention. This embodiment is an optimization based on the above embodiment. Optionally, after the oil fume detection module emits a detection light signal towards the corresponding burner head, and the target light curtain detection area formed by the oil fume detection module is aligned with the burner head area, and after receiving the light signal reflected back by the oil fume particles corresponding to the burner head and defining it as a reflected light signal, the method further includes: Based on the signal intensity of the reflected light signal, it can be determined that there is no user cooking action; Based on the signal intensity of the reflected light signal and the preset mapping relationship between the signal intensity of the reflected light signal and the concentration of oil fume, the concentration of target oil fume within the detection area of ​​the corresponding target light curtain is determined.

[0063] For details not covered in this embodiment, please refer to the above embodiments. Figure 8 As shown, the control method includes: S410. The oil fume detection module emits a detection light signal toward the corresponding burner head, and the target light curtain detection area formed by the oil fume detection module is aligned with the burner head area. It also receives the light signal reflected back by the oil fume particles corresponding to the burner head and defines it as a reflected light signal.

[0064] S420: Based on the signal intensity of the reflected light signal, it is determined that there is no user cooking action.

[0065] Optionally, identifying the absence of user cooking action based on the signal intensity of the reflected light signal includes: determining the rate of change of the signal intensity of the reflected light signal based on the signal intensity of the reflected light signal; and identifying the absence of user cooking action when the rate of change of the signal intensity of the reflected light signal is less than a preset rate of change threshold.

[0066] Specifically, the fume detection module can record the signal intensity S of the current reflected light signal every time t0. n At this time, the signal intensity S of the reflected light signal n The corresponding time point is denoted as t. n The rate of change of the signal intensity of the corresponding reflected light signal can be denoted as k. n And satisfy k n =|S n -S n-1 | / t0, where S n-1 This represents the signal strength of the previously recorded reflected light signal. It can be understood that the rate of change of the reflected light signal's signal strength can also reflect the fluctuations in its intensity; for example, the larger the rate of change, the greater the fluctuations in the signal strength. Furthermore, when the rate of change of the reflected light signal's signal strength is less than a preset threshold, it indicates that there will be no signal interference from the user's cooking actions. For example, in this case, neither the first type of user cooking action nor the second type of user cooking action exists.

[0067] S430. Based on the signal intensity of the reflected light signal and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration, determine the target oil fume concentration within the corresponding target light curtain detection area.

[0068] Specifically, within the duration of the absence of user cooking actions, the target oil fume concentration within the corresponding target light curtain detection area can be determined directly based on the signal intensity of the reflected light signal and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration. The preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration is pre-set, indicating a corresponding relationship between the signal intensity of the reflected light signal and the oil fume concentration. For any known signal intensity of the reflected light signal, a unique oil fume concentration value can be determined. Furthermore, when it is clearly determined that there is no user cooking action, subsequent steps do not involve excluding the interference signal intensity corresponding to the first or second type of user cooking action from the signal intensity of the reflected light signal, ensuring the accuracy and reliability of the oil fume concentration detection results within the corresponding target light curtain detection area.

[0069] S440. Based on the signal intensity of the reflected light signal, identify the existence of a first type of user cooking action; wherein, the first type of user cooking action includes at least waving hand action, placing and moving the pot, and placing and taking the lid off the pot.

[0070] S450, within the duration range corresponding to the cooking action of the first type of user, the intensity of the interference signal corresponding to the cooking action of the first type of user is excluded from the signal intensity of the reflected light signal, so as to detect the oil fume concentration in the detection area of ​​the target light curtain formed accordingly.

[0071] It should also be noted that S420 is the step of identifying the absence of user cooking action based on the signal intensity of the reflected light signal, and S430 is the step of determining the corresponding oil fume concentration within the duration range of the absence of user cooking action. S430 is executed after S420. S440 is the step of identifying the presence of a first type of user cooking action based on the signal intensity of the reflected light signal, and S450 is the step of determining the corresponding oil fume concentration within the duration range of the presence of a first type of user cooking action. S450 is executed after S440. Also, S420 and S440 are two parallel schemes. The execution order of S420 and S440 in this embodiment is only an example and is not limited. For example, S420 can be executed first and then S440, or S440 can be executed first and then S420.

[0072] Figure 9 This is a flowchart illustrating another control method for an oil fume purification device provided in an embodiment of the present invention, as shown below. Figure 9As shown, after the fume purification equipment starts working, it can initially assume that the user has not started cooking. At this time, the fume detection module can detect the concentration of fumes in the overall kitchen environment. Since the user has not started cooking, there is no cooking action, so there is no need to exclude the user's cooking action. The target fume concentration within the corresponding target light curtain detection area can be determined directly based on the signal intensity of the received reflected light signal and the preset mapping relationship between the signal intensity of the reflected light signal and the fume concentration. Subsequently, if the user starts cooking, fumes will be generated in the pot above the stove burner. At this time, the fume detection module will detect the fume concentration in the corresponding burner area. It should be noted that there are two main ways for the fume purification equipment to detect whether the user has started cooking. One is through the human body detection module. When the human body detection module in the fume purification equipment detects that the user is approaching the fume purification equipment, it determines that the user has started cooking. Furthermore, for example, the fume detection module in this solution can also function as a human body detection module. By identifying different signal wavelengths (e.g., infrared signals are 3-4μm, and human body radiation signals are 9-10μm), the fume detection module can distinguish between human body signals and infrared signals, thereby confirming whether a user is near the fume purification device. Another approach is to use the cooktop-stove linkage function, which is built into many current fume purification devices, to detect whether a user is cooking. For example, when the fume purification device detects that the cooktop is on, it can determine that the user has started cooking; conversely, when it detects that the cooktop is off, it can determine that the user is not cooking.

[0073] After confirming that the user has started cooking, the fume detection module can record the signal intensity S of the current reflected light signal every time t0. n At this time, the signal intensity S of the reflected light signal n The corresponding time point is denoted as t. n The rate of change of the signal intensity of the corresponding reflected light signal can be denoted as k. n And satisfy k n =|S n -S n-1 | / t0, where S n-1 This represents the signal intensity of the previously recorded reflected light signal. For example, the fume detection module can detect the fume concentration of the left and right burners separately, thereby understanding the real-time changes in fume concentration at the left and right burners. Afterwards, it is also necessary to determine the rate of change k of the reflected light signal intensity. n The relationship between the value of k and the preset rate of change threshold k0. In one specific embodiment, k n<k0, meaning that when the rate of change of the reflected light signal intensity is less than a preset rate of change threshold, it indicates that there will be no signal interference from user cooking actions. For example, at this time, there are neither the first type of user cooking action nor the second type of user cooking action. In other words, the signal fluctuation is within the normal range, and there is no interference from user cooking actions. Therefore, no signal exclusion operation is required, and the fume purification device can directly record the current signal intensity of the reflected light signal. Furthermore, there is no need to exclude user cooking actions at this time; the target fume concentration within the corresponding target light curtain detection area can be determined directly based on the received reflected light signal intensity and the preset mapping relationship between the reflected light signal intensity and the fume concentration.

[0074] In another specific embodiment, k n ≥k0, meaning that when the rate of change of the reflected light signal intensity is greater than or equal to a preset rate of change threshold, it indicates potential signal interference from user cooking actions. Therefore, it is necessary to collect data on the signal intensity and corresponding rate of change of the reflected light signal over a certain period (e.g., within a first preset time range) and feed this data back to the fume purification equipment. Furthermore, it is also necessary to obtain a first duration within the first preset time range to determine the duration from the moment the rate of change of the reflected light signal intensity is sensed to be greater than or equal to the preset rate of change threshold until the moment the rate of change of the reflected light signal intensity is less than the preset rate of change threshold. This first duration can then be used to further analyze whether user cooking actions exist. In other words, it determines whether the signal fluctuation is caused by interference from a first type of user cooking action or a second type of user cooking action.

[0075] For example, if the signal fluctuation is determined to be interference caused by the first type of user cooking action, signal elimination is required. This involves modifying the signal intensity of the reflected light signal at each moment within the duration of the first type of user cooking action to the target signal intensity. In other words, the target signal intensity is assigned to each moment within the duration of the first type of user cooking action. This eliminates the signal interference caused by the first type of user cooking action, thus eliminating abnormal fluctuations in signal intensity within the duration of the first type of user cooking action. Subsequently, within the duration of the first type of user cooking action, the target oil fume concentration within the corresponding target light curtain detection area can be indirectly determined based on the target signal intensity and the preset mapping relationship between the reflected light signal intensity and the oil fume concentration. For example, if the signal fluctuation is determined to be interference caused by the second type of user cooking action, signal elimination is not required. Subsequently, within the duration of the second type of user cooking action, the target oil fume concentration within the corresponding target light curtain detection area can be directly determined based on the signal intensity of the reflected light signal and the preset mapping relationship between the reflected light signal intensity and the oil fume concentration. In addition, after obtaining the target oil fume concentration within the target light curtain detection area, the oil fume purification device can also perform corresponding feedback actions based on the target oil fume concentration, such as adjusting the air volume, changing the working mode of the range hood, and providing corresponding prompts to the user. The specific response scheme can be adjusted according to the actual user needs, which will not be described in detail in this embodiment.

[0076] Finally, it is necessary to confirm whether the fume detection module 20 has finished its fume detection function, that is, whether the fume purification equipment has completed its work. If it has finished, it means that the fume purification equipment has completed its work. If it has not finished, it means that the fume detection module 20 needs to continue detecting the fume concentration.

[0077] Figure 10 This is a flowchart illustrating another control method for an oil fume purification device provided in an embodiment of the present invention, as shown below. Figure 10 As shown, Figure 10 It can also be understood as Figure 9The specific implementation of distinguishing between the first and second types of user cooking actions, as described above, is the entire process of signal analysis. After collecting data on the signal intensity of the reflected light signal and the corresponding rate of change of the reflected light signal intensity within a certain period (e.g., within a first preset time range) and feeding this data back to the fume purification equipment, it may be necessary to further compare the relationship between the first duration t2 and the preset duration threshold t1. In one specific embodiment, t2 ≥ t1, that is, when the first duration is greater than or equal to the preset duration threshold, it indicates that the signal fluctuation corresponding to the cooking action has a longer duration, corresponding to the second type of user cooking action. Furthermore, once the existence of a second type of user cooking action is clearly determined, it is not necessary to exclude the interference signal intensity corresponding to the second type of user cooking action from the signal intensity of the reflected light signal. In other words, the interference signal intensity corresponding to the second type of user cooking action will not affect the detection result of the corresponding fume concentration, thus ensuring the accuracy and reliability of the detection result of the fume concentration within the corresponding target light curtain detection area. In another specific implementation, t2 < t1, that is, when the first duration is less than a preset duration threshold, it indicates that the fluctuation time of the signal corresponding to the cooking action is relatively short, corresponding to the cooking action of the first type of user. Furthermore, once the existence of the first type of user cooking action is clearly determined, the interference signal intensity corresponding to the first type of user cooking action needs to be promptly excluded from the signal intensity of the reflected light signal to ensure the accuracy and reliability of the detection results of the oil fume concentration within the corresponding target light curtain detection area.

[0078] Furthermore, the following content is optional; users can choose whether to use this process. After acquiring data such as the duration, signal strength, and rate of change of cooking action signals, the fume purification equipment can identify the possible types of cooking actions based on the various characteristics of the signals. For example, if the signal strength fluctuates wildly and within a large range, it is likely caused by the user placing / moving the pan. The acquired cooking action signal data can then be compared with information stored in a cooking action database. This database contains a large number of signals generated by various types of cooking actions, encompassing most of the signals generated by users during actual cooking. By comparing the data and finding the information data closest to the acquired cooking action signal, the type of actual cooking action performed by the user can be determined. The fume purification equipment can also record each cooking action performed by the user throughout the entire cooking process and confirm which cooking action the user performed. This data is fed back into the user's cooking habit database for better service in the future.

[0079] Based on the same inventive concept, embodiments of the present invention also provide an oil fume purification device. This oil fume purification device is used to execute the control method for oil fume purification devices as provided in any of the embodiments of the present invention. Therefore, this oil fume purification device possesses the functional modules and beneficial effects corresponding to the control method for oil fume purification devices. (Continue to refer to...) Figure 1 The fume purification device includes a fume collection hood housing 10, a fume detection module 20, and a controller. The fume collection hood housing 10 is positioned above the cooktop 30, and the fume detection module 20 is positioned on the side of the fume collection hood housing 10 facing the burner 31 of the cooktop 30. The fume detection module 20 is positioned facing the corresponding burner 31. The controller is electrically connected to the fume detection module 20. The controller is used to emit detection light signals towards the corresponding burner 31 using the fume detection module 20, and the target light curtain detection area 40 formed by the fume detection module 20 is aligned with the area of ​​the burner 31. The controller also receives light signals reflected back from the corresponding oil fume particles of the burner 31 and defines them as reflected light signals. Based on the signal intensity of the reflected light signals, the controller identifies the presence of a first type of user cooking action. The first type of user cooking action includes at least waving, placing and moving the pot, and placing and removing the pot lid. Within the duration of the first type of user cooking action, the interference signal intensity corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal to detect the oil fume concentration within the target light curtain detection area 40.

[0080] Specifically, the same content can be referred to in the above embodiments, and will not be repeated here. The fume purification equipment also includes a controller. For example, the controller can be set inside the fume collection hood housing 10. The specific setting position of the controller can be reasonably selected according to the specific structure and model of the fume purification equipment.

[0081] The technical solution in this invention embodiment has lower cost and simpler structure. It detects the concentration of oil fumes in the burner area, that is, it detects the concentration of oil fumes generated at the source during cooking. When a first type of cooking action exists, the interference signal intensity corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal. Then, the oil fume concentration in the target light curtain detection area is determined based on the signal intensity of the reflected light signal after the interference is excluded. The oil fume concentration detection information is more real-time and accurate, and is closer to the needs of actual use. It greatly improves the real-time performance and accuracy of oil fume detection, enabling the oil fume purification equipment to achieve refined and targeted intelligent control, and improving the smoke exhaust effect and user experience. In other words, the target light curtain detection area formed by the fume detection module is aligned with the corresponding burner area. The signal emitted by the fume detection module will be concentrated at the corresponding burner area. At this time, the fume purification equipment can directly obtain the fume situation generated by the corresponding burner during cooking. It has the effect of eliminating the first type of user cooking actions. The signals generated by the user's normal activities during cooking (arm waving, stirring of ingredients, etc.) have been processed to a certain extent, which can effectively eliminate the signal disturbances generated by human activities. That is, the detection result of fume concentration will not be affected by the first type of cooking actions in the actual cooking process of the user. The detection of fume concentration in the specific burner area is more accurate and can accurately capture the source of fume generation. It is more suitable for large-scale application in actual fume purification equipment products.

[0082] Optionally, Figure 11 This is a schematic diagram of the structure of an oil fume detection module provided in an embodiment of the present invention. Figure 12 This is a schematic diagram of light transmission in a first optical lens assembly provided in an embodiment of the present invention, as shown below. Figure 11 and Figure 12 As shown, the oil fume detection module 20 includes a signal transmitter 21, a first optical lens assembly 22, and a signal receiver 23. The signal transmitter 21 is used to emit an initial light signal toward the corresponding burner head 31. The first optical lens assembly 22 is located on the propagation path of the initial light signal and is used to collimate the initial light signal to obtain a parallel emitted detection light signal, and accordingly form a target light curtain detection area 40. The signal receiver 23 is used to receive the light signal reflected back by the oil fume particles corresponding to the burner head 31.

[0083] Specifically, the signal transmitter 21 can emit an initial light signal towards the corresponding burner head 31, providing a basic light signal for oil fume detection. The first optical lens assembly 22 is located on the propagation path of the initial light signal. The first optical lens assembly 22 can collimate the initial light signal, converting the divergent or non-uniform initial light signal into a parallel-emitted detection light signal, and correspondingly forming a stable target light curtain detection area 40 in the space above the corresponding burner head 31. This ensures that the target light curtain detection area 40 can cover the main path of oil fume generation and rise during cooking, guaranteeing the accuracy of subsequent oil fume concentration detection. For example, when oil fume particles generated during cooking enter the target light curtain detection area 40, these particles will change the propagation direction of the parallel-emitted detection light signal, such as scattering or reflection. The signal receiver 23 can receive the light signal reflected back by the oil fume particles. Thus, accurate detection of the oil fume concentration generated during cooking in a specific burner head 31 area is achieved. It should also be noted that the signal transmitter 21 and the corresponding burner head 31 need to be correspondingly set, and the signal receiver 23 and the corresponding burner head 31 need to be correspondingly set. In this embodiment, the specific positions of the signal transmitter 21 and the signal receiver 23 are not specifically required or limited. For example, the signal transmitter 21 and the signal receiver 23 can be arranged adjacent to each other. Figure 11 The relative positions of the signal transmitter 21 and the signal receiver 23 shown are merely examples and are not intended to be limiting.

[0084] In this embodiment, the positions of the signal transmitter 21 and the first optical lens assembly 22 are fixed. Exemplarily, the first optical lens assembly 22 includes a beam collimating lens 221, which is used to collimate the initial light signal. Exemplarily, the beam collimating lens 221 can be understood as a small-angle lens or a convex lens, which can convert light rays originally emitted at various angles into parallel light rays at the same angle. It should also be noted that... Figure 11 The lens structure and size of the collimating lens 221 shown are for illustrative purposes only and are not intended to be limiting. The actual lens structure and size of the collimating lens 221 can be reasonably adjusted according to the actual application of the fume purification equipment.

[0085] Optionally, continue to refer to Figure 11 The oil fume detection module 20 also includes a second optical lens assembly 24; the second optical lens assembly 24 is located on the propagation path of the light signal reflected back by the oil fume particles, and the second optical lens assembly 24 is used to focus the light signal reflected back by the oil fume particles and incident it on the signal receiver 23.

[0086] Specifically, to ensure the reception effect of the reflected light signal and the accuracy of subsequent oil fume concentration detection, a second optical lens assembly 24 can be provided on the receiving end side of the signal receiver 23. For example, the second optical lens assembly 24 can be understood as a large-angle lens or a concave lens, which can collect light signals over a wider range, resulting in a larger detection range and thus increasing the detection range of the signal receiver 23. For example, the second optical lens assembly 24 includes a beam focusing lens, which is used to focus the light signal reflected back from the oil fume particles.

[0087] Optionally, continue to refer to Figure 1 The stove 30 is equipped with two burners 31, and the smoke collection hood housing 10 is equipped with two oil fume detection modules 20. The two oil fume detection modules 20 are respectively positioned facing the two burners 31. The two oil fume detection modules 20 alternately emit detection light signals towards the two burners 31 and receive light signals reflected back by the oil fume particles corresponding to the burners 31, so as to determine the oil fume concentration in the corresponding target light curtain detection area 40 of each burner 31.

[0088] Specifically, the two fume detection modules 20 are respectively positioned facing the two burner heads 31. Exemplarily, the operation of the two fume detection modules 20 can be independent; that is, while one fume detection module 20 detects the fume concentration in its corresponding burner head 31 area, the other fume detection module 20 can also detect the fume concentration in its corresponding burner head 31 area, or it can choose not to detect it. Exemplarily, the operation of the two fume detection modules 20 can also be sequential; that is, after one fume detection module 20 detects the fume concentration in its corresponding burner head 31 area, the other fume detection module 20 can detect the fume concentration in its corresponding burner head 31 area, meaning the two fume detection modules 20 alternately detect the fume concentration in their respective burner head 31 areas. This meets the needs of fume concentration detection in more scenarios. Exemplarily, the two fume detection modules 20 can be arranged adjacently or non-adjacently, and their specific positions can be adjusted according to actual needs.

[0089] In one specific embodiment, the two fume detection modules 20 can alternately emit detection light signals toward the two burners 31 and receive light signals reflected back from the corresponding fume particles of the burners 31. This allows for accurate determination of the fume concentration within the target light curtain detection area 40 of each burner 31 after eliminating interference from the user's cooking actions. For example, the two fume detection modules 20 include a first fume detection module and a second fume detection module, wherein the first fume detection module is positioned corresponding to the left burner 31, and the second fume detection module is positioned corresponding to the right burner 31. The first fume detection module (the second fume detection module is not working at this time) emits a parallel detection light signal towards the left burner 31 and receives the light signal reflected back by the corresponding fume particles of the left burner 31. This is to determine the fume concentration within the target light curtain detection area 40 of the left burner 31 after eliminating interference from the cooking actions of the first type of user. Then, the second fume detection module (the first fume detection module is not working at this time) emits a parallel detection light signal towards the right burner 31 and receives the light signal reflected back by the corresponding fume particles of the right burner 31. This is to further eliminate interference from the cooking actions of the first type of user. After interference from the action, the oil fume concentration in the target light curtain detection area 40 of the right burner 31 is determined. Then, the first oil fume detection module (the second oil fume detection module is not working at this time) emits a parallel detection light signal towards the left burner 31 and receives the light signal reflected back by the oil fume particles corresponding to the left burner 31. This is to eliminate the interference of the first type of user cooking action and determine the oil fume concentration in the target light curtain detection area 40 of the left burner 31. This process is repeated alternately to obtain the oil fume concentration corresponding to the left burner 31 and the oil fume concentration corresponding to the right burner 31 during cooking.

[0090] It should be understood that the various forms of processes shown above can be used, with steps reordered, added, or deleted. For example, the steps described in this invention can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution of this invention can be achieved, and this is not limited herein.

[0091] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can be made according to design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A control method for an oil fume purification device, characterized in that, The fume purification device includes a fume collection hood housing and a fume detection module; the fume collection hood housing is located above the stove, and the fume detection module is located on the side of the fume collection hood housing facing the burner of the stove; The oil fume detection module is positioned facing the corresponding burner head; The control method includes: The oil fume detection module emits a detection light signal toward the corresponding burner head, and the target light curtain detection area formed by the oil fume detection module is aligned with the burner head area. It also receives the light signal reflected back by the oil fume particles corresponding to the burner head and defines it as a reflected light signal. Based on the signal intensity of the reflected light signal, a first type of user cooking action is identified; wherein, the first type of user cooking action includes at least waving hand action, placing and moving the pot, and placing and taking the lid off the pot. Within the duration range corresponding to the first type of user cooking action, the intensity of the interference signal corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal in order to detect the oil fume concentration in the detection area of ​​the target light curtain formed accordingly.

2. The control method according to claim 1, characterized in that, Based on the signal intensity of the reflected light signal, a first type of user cooking action is identified, including: The rate of change of the signal intensity of the reflected light signal is determined based on the signal intensity of the reflected light signal. When the rate of change of the signal intensity of the reflected light signal is greater than or equal to a preset rate of change threshold, a first duration is obtained within a first preset time range; wherein, the first duration is the duration during which the rate of change of the signal intensity of the reflected light signal is greater than or equal to the preset rate of change threshold; When the first duration is less than a preset duration threshold, it is determined that the first type of user cooking action exists.

3. The control method according to claim 2, characterized in that, When the rate of change of the reflected light signal intensity is greater than or equal to a preset rate of change threshold, after obtaining a first duration within a first preset time range, the method further includes: When the first duration is greater than or equal to the preset duration threshold, it is determined that there is a second type of user cooking action; wherein, the second type of user cooking action includes at least a stir-frying action; Within the duration of the second type of user cooking action, the target oil fume concentration within the target light curtain detection area is determined based on the signal intensity of the reflected light signal and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration.

4. The control method according to claim 1, characterized in that, Within the duration range corresponding to the first type of user cooking action, the interference signal intensity corresponding to the first type of user cooking action is excluded from the signal intensity of the reflected light signal to detect the oil fume concentration within the detection area of ​​the corresponding target light curtain, including: The signal intensity of the reflected light signal corresponding to the start time of the duration range corresponding to the first type of user cooking action is obtained and defined as the target signal intensity; Modify the signal intensity of the reflected light signal corresponding to each time point between the start and end time of the duration range corresponding to the first type of user cooking action to the target signal intensity; Within the duration of the first type of user cooking action, the target oil fume concentration within the corresponding target light curtain detection area is determined based on the target signal intensity and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration.

5. The control method according to claim 1, characterized in that, The process includes emitting a detection light signal towards the corresponding burner head using the oil fume detection module, aligning the target light curtain detection area formed by the oil fume detection module with the burner head area, receiving the light signal reflected back from the oil fume particles corresponding to the burner head, and defining it as a reflected light signal. The process also includes: Based on the signal intensity of the reflected light signal, it is determined that there is no user cooking action; Based on the signal intensity of the reflected light signal and the preset mapping relationship between the signal intensity of the reflected light signal and the oil fume concentration, the target oil fume concentration within the corresponding target light curtain detection area is determined.

6. The control method according to claim 5, characterized in that, Based on the signal intensity of the reflected light signal, identifying the absence of user cooking activity includes: The rate of change of the signal intensity of the reflected light signal is determined based on the signal intensity of the reflected light signal. When the rate of change of the reflected light signal intensity is less than a preset rate of change threshold, it is determined that the user's cooking action does not exist.

7. The control method according to claim 1, characterized in that, After identifying the presence of a first type of user cooking action based on the signal intensity of the reflected light signal, the process further includes: Determine the action type of the first type of user's cooking action; A database of user cooking habits is constructed based on the duration range and time sequence corresponding to each of the described action types.

8. An oil fume purification device, characterized in that, A control method for performing the oil fume purification equipment as described in any one of claims 1-7; The fume purification device includes a fume collection hood housing, a fume detection module, and a controller; the fume collection hood housing is positioned above the stove, and the fume detection module is positioned on the side of the fume collection hood housing facing the burner of the stove; the fume detection module is positioned facing the corresponding burner. The controller is electrically connected to the fume detection module. The controller is used to emit detection light signals towards the corresponding burner head using the fume detection module, and the target light curtain detection area formed by the fume detection module is aligned with the burner head area. The controller also receives light signals reflected back from the fume particles corresponding to the burner head and defines them as reflected light signals. Based on the signal intensity of the reflected light signals, the controller identifies the presence of a first type of user cooking action. The first type of user cooking action includes at least waving, placing and moving the pot, and placing and removing the lid. Within the duration of the first type of user cooking action, the controller excludes the interference signal intensity corresponding to the first type of user cooking action from the signal intensity of the reflected light signals to detect the fume concentration within the target light curtain detection area.

9. The oil fume purification equipment according to claim 8, characterized in that, The oil fume detection module includes a signal transmitter, a first optical lens assembly, and a signal receiver; The signal transmitter is used to emit an initial light signal toward the corresponding furnace head; The first optical lens assembly is located on the propagation path of the initial light signal. The first optical lens assembly is used to collimate the initial light signal to obtain a parallel-emitted detection light signal, and accordingly forms the target light curtain detection area. The signal receiver is used to receive light signals reflected back by the oil fume particles corresponding to the burner head.

10. The oil fume purification equipment according to claim 8, characterized in that, The stove is equipped with two burners, and the fume collection hood housing is equipped with two oil fume detection modules; The two oil fume detection modules are respectively positioned facing the two burners. The two oil fume detection modules alternately emit detection light signals towards the two burners and receive light signals reflected back by the oil fume particles corresponding to the burners.

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