Range hood and control method thereof

Abstract

The invention discloses a range hood and a control method thereof.The range hood comprises a plurality of branch air pipes and draught fans arranged in the branch air pipes correspondingly, and air inlets of the branch air pipes are located above different cooking areas correspondingly. Continuously acquiring oil smoke information of each cooking area; the predicted rotating speed of each fan is obtained according to the oil smoke information of each cooking area; obtaining a predicted total noise value of the range hood according to the predicted rotating speed of each fan; when the predicted total noise value is larger than a preset noise threshold value, the target rotating speed of each fan is obtained according to the predicted total noise value, the preset noise threshold value, the predicted rotating speed of each fan and the lampblack information of each cooking area; and all the fans are controlled to operate according to the target rotating speeds of all the fans, the actual operation total noise of the range hood can be controlled within the preset noise threshold value on the premise that the oil smoke suction efficiency and the oil smoke diffusion trend are controllable, and balance optimization of the oil smoke suction effect and the operation noise is achieved.

Description

Technical Field

[0001] This invention relates to the field of kitchen appliances, and more particularly to a range hood and its control method. Background Technology

[0002] Currently, there are significant differences in the amount of oil fumes and moisture generated in the stove area and other areas during kitchen cooking. An ideal fume extraction method should be able to dynamically allocate the airflow of the air intake based on the actual amount of pollutants escaping from each area. However, most existing range hoods have a single air intake or a fixed duct structure, making it difficult to achieve differentiated extraction for different areas, resulting in localized escape of oil fumes or moisture.

[0003] To address these issues, multi-duct range hoods have emerged on the market, employing multiple smoke vents above the cooktop to cater to different cooking areas. However, in actual use, these products often generate significant operating noise when multiple ducts are working simultaneously. Lacking real-time sensing of the amount of fumes or moisture and an automatic airflow distribution mechanism, each duct often operates in a constant or preset mode. Even when only a small amount of moisture needs to be processed, the extra ducts continue to run at full speed, not only wasting energy but also significantly increasing noise and negatively impacting the user experience. Summary of the Invention

[0004] This invention provides a range hood and its control method, which can effectively reduce the superimposed noise generated by the operation of multiple fans while effectively exhausting oil fumes from multiple areas in the kitchen.

[0005] According to one aspect of the present invention, a method for controlling a range hood is provided. The range hood includes multiple branch ducts and fans respectively disposed in each branch duct. The air inlets of each branch duct are located above different cooking zones. The range hood control method includes: While the range hood is running, it continuously acquires information about the fumes from each cooking area. The predicted rotational speed of each fan is obtained based on the oil fume information of each cooking area; The predicted total noise level of the range hood is obtained based on the predicted rotational speed of each fan. When the predicted total noise value is greater than the preset noise threshold, the target speed of each fan is obtained based on the predicted total noise value, the preset noise threshold, the predicted speed of each fan, and the oil fume information of each cooking area. The operation of each fan is controlled according to its target speed.

[0006] Optional, the fume information includes fume concentration; Based on the predicted total noise value, preset noise threshold, predicted speed of each fan, and oil fume information of each cooking zone, the target speed of each fan is obtained, including: Based on the predicted rotational speed of each fan and the concentration of oil fumes in each cooking zone, the comprehensive indicators of each fan are obtained. Obtain the noise difference between the predicted total noise value and the preset noise threshold; The target speed of each fan is obtained based on the noise difference, the comprehensive indicators of each fan, and the predicted speed of each fan.

[0007] Optionally, the fans are classified as Class I fans, Class II fans, and Class III fans. The comprehensive performance index of Class I fans is greater than that of Class II fans, and the comprehensive performance index of Class II fans is greater than that of Class III fans. Based on the noise difference, the comprehensive indicators of each fan, and the predicted speed of each fan, the target speed of each fan is obtained, including: When the noise difference is greater than zero and less than or equal to the first preset difference, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the predicted speed of the second type of fan is determined as the target speed of the second type of fan, and the predicted speed of the third type of fan is determined as the target speed of the third type of fan. When the noise difference is greater than the first preset difference and less than or equal to the second preset difference, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the difference between the predicted speed and the preset speed of the second type of fan is determined as the target speed of the second type of fan, and the predicted speed of the third type of fan is determined as the target speed of the third type of fan. When the noise difference is greater than the second preset difference, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the difference between the predicted speed and the preset speed of the second type of fan is determined as the target speed of the second type of fan, and the difference between the predicted speed and the preset speed of the third type of fan is determined as the target speed of the third type of fan. The second preset difference is greater than the first preset difference, and the first preset difference is greater than zero.

[0008] Optionally, after obtaining the target speed of each fan based on the predicted total noise value, the preset noise threshold, the predicted speed of each fan, and the oil fume information of each cooking zone, and before controlling the operation of each fan according to the target speed of each fan, the method further includes: The target total noise level and total exhaust volume of the range hood are obtained based on the target speed of each fan. Determine whether the target total noise value is less than or equal to the preset noise threshold, and whether the total exhaust volume is greater than the preset exhaust volume; If so, then execute the steps of controlling the operation of each fan according to the target speed of each fan; If not, return to the step of continuously acquiring oil fume information from each cooking zone during the operation of the range hood.

[0009] Optional, the fume information includes fume concentration; The control method for range hoods also includes: when the predicted total noise value is less than or equal to the preset noise threshold, obtaining the comprehensive index of each fan based on the predicted speed of each fan and the oil fume concentration in each cooking zone; Determine whether the comprehensive indicators of each fan are all greater than or equal to zero; If so, the predicted speed of each fan will be determined as the target speed of each fan. If not, then all wind turbines with a comprehensive index less than zero will be classified as Class IV wind turbines, and all wind turbines with a comprehensive index greater than or equal to zero will be classified as Class V wind turbines. The sum of the predicted speed and the preset speed of the fourth type of fan is determined as the target speed of the fourth type of fan, and the predicted speed of the fifth type of fan is determined as the target speed of the fifth type of fan.

[0010] Optionally, when determining the target speed of the fourth type of fan by summing the predicted speed and the preset speed, and determining the target speed of the fifth type of fan by the predicted speed, after controlling the operation of each fan according to the target speed of each fan, the method further includes: Obtain the duration for each fan to operate at the current target speed; When the preset time is reached, return to the step of continuously acquiring oil fume information from each cooking zone during the operation of the range hood.

[0011] Optionally, based on the predicted rotational speed of each fan and the oil fume concentration in each cooking zone, a comprehensive index of each fan can be obtained, including: Obtain the formula for calculating the comprehensive index; Based on the comprehensive index calculation formula, the comprehensive index of each fan is obtained according to the predicted speed of each fan and the oil fume concentration of each cooking zone. The formula for calculating the comprehensive index is: P i =α×n i / n max -β×S i / S max ; Among them, P i Let n be the comprehensive index of the i-th wind turbine. i S is the predicted rotational speed of the i-th fan. i Let n be the oil fume concentration in the cooking area corresponding to the i-th fan, α be the weighting coefficient of the predicted rotation speed, β be the weighting coefficient of the oil fume concentration, and n be the weighting coefficient of the oil fume concentration. max The normalization factor for predicting rotational speed, S max This is the normalization factor for the concentration of cooking fumes.

[0012] Optionally, the predicted total noise level of the range hood can be obtained based on the predicted rotational speed of each fan, including: The predicted noise value of each fan is obtained based on the predicted speed of each fan. Obtain the formula for calculating total noise; Based on the total noise calculation formula, the predicted total noise value of the range hood is obtained according to the predicted noise value of each fan. The formula for calculating total noise is: Among them, L total To predict the total noise level, let Li be the noise level of the i-th fan, and ΔL be the noise level of the i-th fan. phase q represents the phase interference correction value, and q represents the number of fans in the range hood.

[0013] Optionally, the oil fume information includes a first oil fume concentration, a second oil fume concentration, an oil fume diffusion direction, and an oil fume diffusion speed; Continuously acquire information on cooking fumes from each cooking area, including: Continuously acquire first-image information and oil fume sensor information from each cooking area; Based on the first image information, the first oil fume concentration, oil fume diffusion direction and oil fume diffusion speed of each cooking area are obtained; The second oil fume concentration in each cooking area is obtained based on oil fume sensor information; The predicted rotational speed of each fan is obtained based on the oil fume information from each cooking zone, including: The overall oil fume distribution map is obtained based on the first oil fume concentration, the oil fume diffusion direction, the oil fume diffusion speed, and the second oil fume concentration. Obtain a deep learning model for predicting rotational speed; Based on a deep learning model, the predicted rotational speed of each fan is obtained from the overall oil fume distribution map.

[0014] Optionally, before the range hood is in operation, it also includes: When the range hood is started, second image information of each cooking zone is acquired; Based on the information from each second image, obtain the types of cooking utensils located in each cooking area; The initial target speed of each fan is determined based on the type of cooking appliance.

[0015] According to another aspect of the present invention, a range hood is provided, comprising: a controller, a plurality of air ducts, and fans respectively disposed in each air duct; Each air duct corresponds to a different cooking area; The controller is used to execute the control method of the range hood described above.

[0016] The range hood control method provided by this invention continuously acquires oil fume information from each cooking zone during the range hood's operation; obtains the predicted rotational speed of each fan based on the oil fume information from each cooking zone; obtains the predicted total noise value of the range hood based on the predicted rotational speed of each fan; when the predicted total noise value exceeds a preset noise threshold, obtains the target rotational speed of each fan based on the predicted total noise value, the preset noise threshold, the predicted rotational speed of each fan, and the oil fume information from each cooking zone; and controls the operation of each fan according to the target rotational speed of each fan. This method can control the actual total operating noise of the range hood within a preset noise threshold while ensuring oil fume extraction efficiency and controllable oil fume diffusion trends. Ultimately, it obtains the target rotational speed of each fan that balances oil fume treatment performance and noise reduction requirements, achieving a balanced optimization of oil fume extraction effect and operating noise.

[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 a range hood provided in an embodiment of the present invention; Figure 2 This is a flowchart of a control method for a range hood provided in an embodiment of the present invention; Figure 3 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention; Figure 4 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention; In the picture: 10: Range hood; 11: Branch duct; 12: Fan; 13: Main duct; 14: Common flue; 15: Main fan; 16: Detection probe; 111: Main branch duct; 112: Left branch duct; 113: Right branch duct; 121: First fan; 122: Second fan; 123: Third fan; 21: Stove; 22: Rice cooker; 23: Multifunctional cooking appliance. 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 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 structural schematic diagram of a range hood provided in an embodiment of the present invention, as shown below. Figure 1 As shown, the range hood 10 includes multiple branch ducts 11 and fans 12 respectively installed in each branch duct 11. The air inlets of each branch duct 11 are located above different cooking areas.

[0023] Specifically, the range hood 10 may include multiple branch ducts 11. Figure 1The example shows a range hood 10 comprising three branch ducts 11: a main branch duct 111 and a left branch duct 112 and a right branch duct 113 located on either side of the main branch duct 111. It can be understood that each branch duct 11 is located above a different cooking area, and the types of cookware placed in the different cooking areas can be different to accommodate diverse cooking needs. For example, the cooking area located below the main branch duct 111 typically corresponds to the main heating and cooking area, where a stove 21 can be placed. The stove 21 generates a large amount of high-temperature oil fumes during stir-frying, deep-frying, and other operations. The main duct 111 is designed with strong suction to focus on treating the oil fume pollutants in this area. The cooking area located below the left branch duct 112 can be placed where a rice cooker 22 can be placed. The rice cooker 22 mainly generates water vapor during cooking rice or soup, and the amount generated is relatively stable. The left branch duct 112 can be adjusted to an appropriate airflow level for extraction based on the amount of water vapor generated. The cooking area located below the right branch duct 113 can be placed where a multi-functional cooking appliance 23 (such as an air fryer, steamer, slow cooker, etc.) can be placed. Such appliances may generate oil fumes or water vapor, or a mixture of both, during operation. The right branch duct 113 can automatically match the corresponding airflow based on the actual type and concentration of pollutants generated.

[0024] Each branch duct 11 can be equipped with a fan 12. For example, the main branch duct 111 is equipped with a first fan 121, the left branch duct 112 is equipped with a second fan 122, and the right branch duct 113 is equipped with a third fan 123. Each fan 12 is independent of each other and can be controlled by a controller to start, stop and speed.

[0025] The air outlets of each duct 11 can be connected to the main duct 13, and the air outlets of the main duct 13 can be connected to the common flue 14. Thus, cooking fumes from each cooking area can enter the main duct 13 through each branch duct 12, and then enter the common flue 14 from the main duct 13, achieving the effect of exhausting cooking fumes and moisture from the kitchen area. To further improve the exhaust effect, a main fan 15 can be installed near the air outlet of the main duct 13.

[0026] The above exemplifies an arrangement of a multi-duct range hood in a kitchen, but is not limited thereto. Exemplarily, the range hood 10 may further include a controller, which may be electrically and / or communicatively connected to at least each fan. In conjunction with the above-described range hood, embodiments of the present invention also provide a control method for a range hood, capable of effectively exhausting fumes from multiple areas in a kitchen while intelligently reducing the superimposed noise generated by the operation of multiple fans. This control method can be executed by the controller in the range hood. Therefore, the range hood provided in the embodiments of the present invention includes the technical features of the control method of the range hood provided in any embodiment of the present invention, and can achieve the beneficial effects of the control method of the range hood provided in any embodiment of the present invention. Similarities can be found in the following description of the control method of the range hood provided in the embodiments of the present invention, which will not be repeated here.

[0027] Figure 2 This is a flowchart of a range hood control method provided in an embodiment of the present invention, such as... Figure 2 As shown, the control method of this range hood includes: S110: While the range hood is running, continuously acquire information on the fumes from each cooking area.

[0028] Specifically, the oil fume information may include at least one of oil fume concentration, oil fume diffusion direction, and oil fume diffusion speed. This oil fume information can be obtained through image information, or the oil fume concentration can be obtained through an oil fume sensor. For example, refer to... Figure 1 Each branch duct 11 can be equipped with a detection probe 16 at its air inlet. The detection probe 16 can be equipped with an image acquisition device and a fume sensor. The image acquisition device can acquire image information of each cooking area below each branch duct 11 and obtain fume information of each cooking area through the image information. The fume sensor can acquire fume sensing information of each cooking area below each branch duct 11 and obtain fume concentration of each cooking area through the fume sensing information.

[0029] For example, the oil fume information includes a first oil fume concentration, a second oil fume concentration, an oil fume diffusion direction, and an oil fume diffusion speed. Continuously acquiring oil fume information for each cooking area includes: continuously acquiring first image information and oil fume sensing information for each cooking area; acquiring the first oil fume concentration, oil fume diffusion direction, and oil fume diffusion speed for each cooking area based on the first image information; and acquiring the second oil fume concentration for each cooking area based on the oil fume sensing information.

[0030] Specifically, the system acquires image information (i.e., first image information) of each cooking area in real time using an image acquisition device. The controller performs image processing and feature analysis on the first image information of each cooking area to obtain the first oil fume concentration, oil fume diffusion direction, and oil fume diffusion speed corresponding to each cooking area. The first oil fume concentration is quantified based on the pixel grayscale value, oil fume coverage area, and contour density of the oil fume area. The oil fume diffusion direction is determined by the centroid displacement vector of the oil fume area in multiple consecutive frames of images. The oil fume diffusion speed is calculated based on the moving distance and contour expansion rate of the oil fume area per unit time. Simultaneously, smoke sensors positioned at corresponding locations in each cooking area acquire oil fume sensing information in real time. The controller can then obtain the second oil fume concentration of each cooking area based on this sensing information, achieving dual oil fume concentration acquisition through both visual image detection and physical sensor detection. This provides accurate and reliable data support for subsequent oil fume treatment and airflow control.

[0031] S120: Obtain the predicted speed of each fan based on the oil fume information of each cooking area.

[0032] Specifically, the predicted rotational speed of each fan 12 can be obtained based on the oil fume concentration in each cooking area below each branch duct 11. For example, the predicted rotational speed of the first fan 121 can be obtained based on the oil fume concentration in the cooking area below the main branch duct 111, the predicted rotational speed of the second fan 122 can be obtained based on the oil fume concentration in the cooking area below the left branch duct 112, and the predicted rotational speed of the third fan 123 can be obtained based on the oil fume concentration in the cooking area below the right branch duct 113. Alternatively, in another feasible embodiment, the predicted rotational speeds of the three fans can be obtained by combining the oil fume concentrations of the three cooking areas and comparing the differences in oil fume concentrations among the three cooking areas.

[0033] The predicted rotational speed of each fan can also be obtained by combining the oil fume information obtained through image information and the oil fume information obtained through smoke sensors. For example, obtaining the predicted rotational speed of each fan based on the oil fume information of each cooking area includes: obtaining an overall oil fume distribution map based on the first oil fume concentration, oil fume diffusion direction, oil fume diffusion speed, and second oil fume concentration; obtaining a deep learning model for predicting rotational speed; and obtaining the predicted rotational speed of each fan based on the overall oil fume distribution map using the deep learning model.

[0034] Specifically, the first oil fume concentration, oil fume diffusion direction, and oil fume diffusion speed obtained from image information can be fused with the second oil fume concentration obtained from oil fume sensors to generate an overall oil fume distribution map that reflects the real-time distribution of oil fumes in the kitchen. This overall oil fume distribution map includes the oil fume concentration, diffusion trend, and spatial distribution characteristics of each cooking area. Subsequently, a pre-trained deep learning model for predicting fan speeds can be invoked. This model takes the overall oil fume distribution map as input and the optimal speed of each fan as output, and is trained using a large amount of oil fume scene data. The aforementioned overall oil fume distribution map can be input into this deep learning model, and the model outputs the predicted speeds of each fan that match the current oil fume distribution, thereby achieving intelligent prediction of fan speeds based on multi-source oil fume information and deep learning, improving oil fume extraction efficiency and control accuracy.

[0035] S130. Obtain the predicted total noise value of the range hood based on the predicted speed of each fan.

[0036] Specifically, the predicted noise of each fan can be determined based on the predicted rotational speed of each fan, and the sum of the predicted noise values ​​can be determined as the total predicted noise value of the range hood.

[0037] For example, obtaining the predicted total noise value of the range hood based on the predicted speed of each fan includes: obtaining the predicted noise value of each fan based on the predicted speed of each fan; obtaining the total noise calculation formula; and obtaining the predicted total noise value of the range hood based on the total noise calculation formula and the predicted noise values ​​of each fan. The total noise calculation formula is as follows: ; Among them, L total To predict the total noise level, let Li be the noise level of the i-th fan, and ΔL be the noise level of the i-th fan. phase q represents the phase interference correction value, and q represents the number of fans in the range hood.

[0038] Specifically, the predicted noise value for each fan can be obtained first by using the predicted rotational speed of each fan and a pre-calibrated speed-noise mapping relationship. Then, a preset total noise calculation formula can be used to calculate the predicted total noise value of the range hood based on the predicted noise values ​​of each fan. This total noise calculation formula comprehensively considers the noise superposition effect of multiple fans and the influence of phase interference, making the predicted total noise value more closely match the actual operating conditions and providing an accurate basis for subsequent noise optimization and control.

[0039] S140. When the predicted total noise value is greater than the preset noise threshold, the target speed of each fan is obtained based on the predicted total noise value, the preset noise threshold, the predicted speed of each fan, and the oil fume information of each cooking area.

[0040] S150: Control the operation of each fan according to the target speed of each fan.

[0041] Specifically, when the predicted total noise value exceeds the preset noise threshold, it indicates that the predicted noise generated by controlling the operation of each fan with its predicted speed will exceed the allowable noise range. In this case, instead of directly using the predicted speed of each fan to control their operation, the predicted speed is optimized and adjusted using multiple parameters to obtain the target speed for each fan. At this point, the predicted total noise value, the preset noise threshold, the predicted speed of each fan, and the oil fume information from each cooking zone can be used as comprehensive input parameters. Under the dual constraints of oil fume extraction efficiency and noise limits, the speed of each fan is iteratively optimized or weighted to obtain the final target speed for each fan. Then, the operation of each fan is controlled according to its target speed. This approach ensures that the actual total operating noise of the range hood is controlled within the preset noise threshold while maintaining oil fume extraction efficiency and controllable oil fume diffusion trends. Ultimately, it achieves a target speed for each fan that balances oil fume treatment performance and noise reduction requirements, thus realizing a balanced optimization of oil fume extraction effect and operating noise.

[0042] The range hood control method provided in this invention continuously acquires oil fume information from each cooking zone during the range hood's operation; obtains the predicted rotational speed of each fan based on the oil fume information from each cooking zone; obtains the predicted total noise value of the range hood based on the predicted rotational speed of each fan; when the predicted total noise value is greater than a preset noise threshold, obtains the target rotational speed of each fan based on the predicted total noise value, the preset noise threshold, the predicted rotational speed of each fan, and the oil fume information from each cooking zone; and controls the operation of each fan according to the target rotational speed of each fan. This method can control the actual total operating noise of the range hood within a preset noise threshold while ensuring oil fume extraction efficiency and controllable oil fume diffusion trend. Ultimately, it obtains the target rotational speed of each fan that balances oil fume treatment performance and noise reduction requirements, achieving a balanced optimization of oil fume extraction effect and operating noise.

[0043] Optional, Figure 3 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention, such as... Figure 3 As shown, the control method of this range hood includes: S211. While the range hood is running, continuously acquire information on the fumes from each cooking area.

[0044] S212. Obtain the predicted rotational speed of each fan based on the oil fume information of each cooking area.

[0045] S213. Obtain the predicted total noise value of the range hood based on the predicted speed of each fan.

[0046] S214. Determine whether the predicted total noise value is greater than the preset noise threshold; if yes, proceed to step S215; if no, proceed to step S218.

[0047] S215. Based on the predicted rotational speed of each fan and the oil fume concentration in each cooking zone, obtain the comprehensive index of each fan.

[0048] Specifically, by combining the predicted rotation speed of each fan with the oil fume concentration in the corresponding cooking area, the suction demand and operating intensity of each fan are weighted and calculated to obtain a comprehensive index for each fan. This comprehensive index is used to characterize the priority and suction importance of each fan under the current cooking conditions, so that the operating priority or control needs of each fan can be dynamically evaluated based on the comprehensive index, in order to achieve a balance between efficient smoke exhaust and noise.

[0049] For example, based on the predicted rotational speed of each fan and the oil fume concentration in each cooking zone, a comprehensive index for each fan is obtained, including: obtaining the comprehensive index calculation formula; and based on the comprehensive index calculation formula, obtaining the comprehensive index for each fan according to the predicted rotational speed of each fan and the oil fume concentration in each cooking zone. The comprehensive index calculation formula is: P i =α×n i / n max -β×S i / S max Among them, P i Let n be the comprehensive index of the i-th wind turbine. i S is the predicted rotational speed of the i-th fan. i Let n be the oil fume concentration in the cooking area corresponding to the i-th fan, α be the weighting coefficient of the predicted rotation speed, β be the weighting coefficient of the oil fume concentration, and n be the weighting coefficient of the oil fume concentration. max The normalization factor for predicting rotational speed, S max This is the normalization factor for the concentration of cooking fumes.

[0050] Specifically, P i P represents the comprehensive index of the i-th wind turbine, which is used to quantitatively assess the urgency or priority of its regulation. i A higher value usually indicates that the fan needs to be adjusted first. i S represents the predicted rotational speed of the i-th fan, in revolutions per minute (RPM). i This represents the real-time oil fume concentration in the cooking area corresponding to the i-th fan, which can be collected by a smoke sensor (such as a PM2.5 sensor or a gas detector), and the unit is milligrams per cubic meter (mg / m³). 3 α and β are the weighting coefficients for predicting rotational speed and oil fume concentration, respectively, and satisfy (α+β=1). In practical applications, specific values ​​can be set according to system design requirements, such as α=0.4 and β=0.6, to emphasize the dominant role of oil fume concentration in exhaust demand. max To normalize the predicted rotational speed, the maximum predicted rotational speed of all fans in the system is typically used, or a fixed upper limit (e.g., 200 RPM) is set based on the rated rotational speed of the fans to normalize the rotational speed to the range of [0,1].max The normalization factor for oil fume concentration is usually the maximum value of oil fume concentration in all cooking zones of the system, or a fixed upper limit value (such as 10 mg / m³) is set according to a safety threshold. 3 The weighting factor α for the predicted rotational speed, the weighting factor β for the oil fume concentration, and the normalization factor n for the predicted rotational speed can be used to normalize the concentration to the range of [0,1]. max Normalization factor S of oil fume concentration max Store it in advance so that it can be directly invoked when needed.

[0051] Based on the real-time predicted rotational speed n of the i-th wind turbine i and its corresponding oil fume concentration S i And obtain the pre-stored weighting coefficient α for predicted rotation speed, weighting coefficient β for oil fume concentration, and normalization factor n for predicted rotation speed. max Normalization factor S of oil fume concentration max The predicted rotational speed n i and its corresponding oil fume concentration S i Substituting these values ​​into the comprehensive index calculation formula above yields the comprehensive evaluation index for the i-th fan, thus allowing the acquisition of comprehensive evaluation indices for all fans. The comprehensive index calculation formula normalizes and weights the two key parameters—predicted rotational speed and oil fume concentration—overcoming the limitations of single-parameter evaluation (e.g., relying solely on rotational speed may ignore the actual pollution level, or relying solely on concentration may ignore the fan's condition). This makes exhaust control more intelligent and precise, ensuring effective oil fume removal while improving system energy efficiency and user experience.

[0052] It should be noted that the above embodiments are merely illustrative examples, and those skilled in the art can make adaptive adjustments to the weighting coefficients, normalization factor selection methods, etc., without departing from the core ideas of this invention.

[0053] S216. Obtain the noise difference between the predicted total noise value and the preset noise threshold.

[0054] Specifically, the difference between the predicted total noise value and the preset noise threshold (i.e., the noise difference) reflects the degree of noise exceeding the standard of the range hood under the current predicted operating state, and provides a basis for subsequent speed adjustment strategies (such as the speed adjustment range of each fan or the number of fans whose speed is adjusted).

[0055] S217. Based on the noise difference, the comprehensive index of each fan, and the predicted speed of each fan, obtain the target speed of each fan; execute step S223.

[0056] Specifically, the speed of each fan is coordinated and corrected by using the noise difference as a constraint, the comprehensive index of each fan as the allocation basis, and the predicted speed of each fan as the base value. This results in the target speed of each fan that satisfies both the oil fume extraction effect and the total noise meets the requirements, thereby achieving a balanced optimization of multiple fans between oil fume treatment and noise reduction control.

[0057] For example, the fans are categorized into three classes: Class I, Class II, and Class III. The overall performance index of Class I fans is higher than that of Class II fans, and the overall performance index of Class II fans is higher than that of Class III fans. Based on the noise difference, the overall performance index of each fan, and the predicted speed of each fan, the target speed of each fan is obtained. This includes: when the noise difference is greater than zero and less than or equal to a first preset difference, determining the difference between the predicted speed of Class I fans and the preset speed as the target speed of Class I fans; determining the predicted speed of Class II fans as the target speed of Class II fans; and determining the predicted speed of Class III fans as the target speed of Class III fans. When the first preset difference is less than or equal to the second preset difference, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the difference between the predicted speed and the preset speed of the second type of fan is determined as the target speed of the second type of fan, and the predicted speed of the third type of fan is determined as the target speed of the third type of fan. When the noise difference is greater than the second preset difference, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the difference between the predicted speed and the preset speed of the second type of fan is determined as the target speed of the second type of fan, and the difference between the predicted speed and the preset speed of the third type of fan is determined as the target speed of the third type of fan. Wherein, the second preset difference is greater than the first preset difference, and the first preset difference is greater than zero.

[0058] Specifically, fans can be classified into multiple categories based on the magnitude of comprehensive indicators. In this embodiment of the invention, fans are categorized into Category 1, Category 2, and Category 3 fans according to their comprehensive indicators from largest to smallest, which is applicable to situations where there are three or more fans. Based on the above fan classification results and the degree of noise exceeding the standard determined by the noise difference, the range of fans requiring reduced speed can be determined.

[0059] For example, when the noise difference is greater than zero and less than or equal to a first preset difference, it is determined that the noise level is slightly exceeded. In this case, only the speed of the first-class fan with the highest comprehensive index can be reduced based on its predicted speed. The predicted speeds of the second-class and third-class fans are directly determined as their respective target speeds. That is, the difference between the predicted speed and the preset speed of the first-class fan is determined as the target speed of the first-class fan, and the predicted speed of the second-class fan is determined as the target speed of the second-class fan, and the predicted speed of the third-class fan is determined as the target speed of the third-class fan. Since the noise exceedance is small, only reducing the speed of the first-class fan with the highest comprehensive index can achieve a slight noise suppression effect. At the same time, retaining the predicted speeds of the second-class and third-class fans can ensure that the oil fume emission requirements of the corresponding cooking areas are met. In particular, the third-class fan corresponds to a fryer with a high concentration of oil fumes. If the speed is reduced, it may lead to oil fume accumulation. Maintaining its predicted speed can avoid this problem, achieving a balance between noise control and oil fume treatment efficiency.

[0060] When the noise difference is greater than the first preset difference but less than or equal to the second preset difference, it can be determined that the noise level is moderately excessive. In this case, simply reducing the speed of the first type of fan is no longer sufficient to meet the noise suppression requirements. Therefore, the speeds of the two types of fans with larger overall performance (i.e., the first and second types of fans) can be reduced based on their respective predicted speeds, while the predicted speed of the third type of fan is directly determined as the target speed. Specifically, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the difference between the predicted speed and the preset speed of the second type of fan is determined as the target speed of the second type of fan, and the predicted speed of the third type of fan is determined as the target speed of the third type of fan.

[0061] When the noise difference exceeds the second preset difference, the noise level is determined to be severely excessive, requiring simultaneous speed reduction of all three types of fans to achieve maximum noise attenuation. In this case, the speed of each fan can be reduced based on its predicted speed. Specifically, the difference between the predicted and preset speeds of the first type of fan is determined as the target speed for the first type, the second type as the target speed, and the third type as the target speed.

[0062] For example, the first preset difference and the second preset difference can be set according to design requirements, and the embodiments of the present invention do not specifically limit this. In a preferred embodiment, the first preset difference can be set to 3dB and the second preset difference to 6dB.

[0063] S218. Based on the predicted rotational speed of each fan and the oil fume concentration in each cooking zone, obtain the comprehensive index of each fan.

[0064] S219. Determine whether the comprehensive index of each fan is greater than or equal to zero; if yes, proceed to step S220; if no, proceed to step S221.

[0065] S220. Determine the predicted speed of each fan as the target speed of each fan; execute step S223.

[0066] S221. All fans with comprehensive indicators less than zero are classified as Class IV fans, and all fans with comprehensive indicators greater than or equal to zero are classified as Class V fans.

[0067] S222. The sum of the predicted speed and the preset speed of the fourth type of fan is determined as the target speed of the fourth type of fan, and the predicted speed of the fifth type of fan is determined as the target speed of the fifth type of fan; proceed to step S223.

[0068] Specifically, when the predicted total noise value is less than or equal to the preset noise threshold, it indicates that the total noise generated by each fan operating at its currently determined predicted speed will not exceed the standard, and no noise suppression adjustment is needed. Instead, the focus shifts to the matching degree between the fan's fume treatment capacity and the load. A comprehensive indicator is used to determine whether the fan's current predicted speed can meet the fume treatment needs of the corresponding cooking area. The speed is then adjusted accordingly to avoid fume accumulation due to insufficient speed or energy waste due to excessive speed, thus achieving a balance between fume treatment efficiency and energy consumption. Specifically, under the premise that the predicted total noise value is less than or equal to the preset noise threshold, the comprehensive indicator P of the i-th fan... i When the value is greater than or equal to zero, it means that the current predicted speed of the fan can match the oil fume load pressure of the corresponding cooking area, and the oil fume treatment needs can be met without adjusting the speed; the comprehensive index P of the i-th fan i When the value is less than zero, it means that the current predicted speed of the fan is insufficient to match the oil fume load pressure, and the speed needs to be increased to enhance the oil fume treatment capacity.

[0069] Therefore, if the predicted total noise value is less than or equal to the preset noise threshold, and if the comprehensive index of each fan is greater than or equal to zero, then the speed of each fan can be set directly without adjusting it. The predicted speed of each fan can be set as its target speed, which can meet the oil fume treatment requirements while avoiding energy waste caused by excessive speed, thus achieving a balance between energy saving and oil fume treatment. However, if the comprehensive index of some fans is less than zero, the fans can be classified according to their comprehensive index. Fans with comprehensive indexes less than zero are classified as Category 4 fans, and those with comprehensive indexes greater than or equal to zero are classified as Category 5 fans. Then, only Category 4 fans with comprehensive indexes less than zero are increased in speed based on their predicted speed, while Category 5 fans are controlled to operate at their predicted speed (i.e., the predicted speed of Category 5 fans is set as their target speed). This allows for the enhancement of oil fume treatment capacity by increasing the speed of some fans, which cannot currently match their oil fume load, thus preventing oil fume accumulation.

[0070] S223. Control the operation of each fan according to the target speed of each fan.

[0071] For example, if the predicted total noise value is less than or equal to a preset noise threshold, and the predicted speed of some fans cannot match their oil fume load, increasing their speed may cause the predicted total noise value to exceed the standard due to the increased speed. In this case, the duration for which each fan operates at its current target speed can be obtained. When the duration reaches the preset time, the process returns to the step of continuously acquiring oil fume information from each cooking area during the operation of the range hood. That is, after controlling the fourth type of fan to increase its speed based on the predicted speed, each fan is controlled to run at its current state for a preset time to achieve effective smoke extraction. After the duration for which each fan operates at its current state reaches the preset time, the program loop is restarted, that is, the process returns to step S211 to continuously acquire oil fume information from each cooking area during the operation of the range hood, so as to determine the target speed of each fan based on the predicted total noise and oil fume information.

[0072] This invention, through a comprehensive index formula, quantifies and combines the predicted rotational speed (load capacity) of the fan with the oil fume concentration (load pressure), avoiding the one-sidedness of single-parameter classification and ensuring that the fan classification results closely match actual operating requirements, providing a reliable basis for subsequent speed adjustment. By dividing the noise difference range, the speed of different types of fans is adjusted in a targeted manner, avoiding a "one-size-fits-all" speed adjustment approach. This effectively suppresses noise when it exceeds the standard, and avoids excessive adjustment that leads to a decrease in oil fume treatment efficiency when the noise level is within the standard. Based on the comprehensive index classification and adjustment of the fans, priority is given to adjusting the fans with the best overall performance and the highest load capacity. Starting with low-pressure fans, the technology is gradually being expanded to other types of fans to ensure that the fan's fume treatment capacity is preserved to the maximum extent while controlling noise, and to avoid the accumulation of fumes due to speed adjustment. The calculation of comprehensive indicators and the determination of target speed are achieved through simple numerical calculations, without the need for complex algorithms, which facilitates engineering applications and equipment integration and reduces control costs. The weighting coefficients, normalization factors, preset speeds, preset differences and other parameters in the comprehensive indicator formula can all be flexibly adjusted according to the actual cooking scenario, fan model and noise control requirements, and can be widely used in various multi-fan coordinated smoke exhaust scenarios.

[0073] Optional, Figure 4 This is a flowchart of another control method for a range hood provided in an embodiment of the present invention, such as... Figure 4 As shown, the control method of this range hood includes: S311. When the range hood is started, acquire the second image information of each cooking zone.

[0074] S312. Obtain the types of cooking utensils located in each cooking area based on the information from each second image.

[0075] S313. Obtain the initial target speed of each fan according to the type of cooking appliance.

[0076] Specifically, after the range hood is started (e.g., when the user presses the power button or the stove ignition signal is detected), the detection probes at the air inlets of each branch duct can acquire second image information of each cooking area. This second image information can then be input into a preset image recognition model (such as a CNN convolutional neural network model, trained with a large number of kitchen stove image samples, achieving an accuracy rate of ≥98%). Through feature extraction and comparison, the type of cooking utensils in each cooking area can be determined. For example, the specific recognition logic can be as follows: extract features such as the size of the stove head, flame pattern, and type of cookware from the image, and match them with a preset feature library of cooking utensil types. High-smoke stoves (stir-fry stoves, deep-fry stoves) are characterized by large stove head size, concentrated and high flame, and deep cookware (such as woks and deep fryers); medium-smoke stoves (steaming stoves, stewing stoves) are characterized by medium stove head size, gentle flame, and cookware such as steamers or casseroles; low-smoke stoves (warming stoves, slow-cooking stoves) are characterized by small stove head size, no obvious flame or weak flame, and cookware such as warming pots. After recognition, the stove type determination result for each cooking area is output, providing a basis for initial target speed matching. A preset correspondence table between cooking utensil types and initial target speeds can be used (based on the matching characteristics of stove smoke generation and fan airflow, and can be adjusted according to the actual scenario). After identifying the stove type, the corresponding initial target speed is directly matched. For example, cooking appliances that produce a large amount of oil fumes require a higher initial target speed to ensure rapid smoke extraction; cooking appliances that produce a medium amount of oil fumes require a medium initial target speed to balance smoke extraction and energy consumption; and cooking appliances that produce a low amount of oil fumes require a lower initial target speed to avoid energy waste. At the same time, the initial target speed must be set such that the total noise level after adding up the noise levels corresponding to the initial target speeds of a single fan does not exceed a preset noise threshold, allowing for adjustments to the speed during subsequent operation.

[0077] S314. While the range hood is running, continuously acquire information on the fumes from each cooking area.

[0078] S315. Obtain the predicted speed of each fan based on the oil fume information of each cooking area.

[0079] S316. Obtain the predicted total noise value of the range hood based on the predicted speed of each fan.

[0080] S317. Based on the predicted rotational speed of each fan and the oil fume concentration in each cooking zone, obtain the comprehensive index of each fan.

[0081] S318. Determine whether the predicted total noise value is greater than the preset noise threshold; if yes, proceed to step S319; if no, proceed to step S321.

[0082] S319. Obtain the noise difference between the predicted total noise value and the preset noise threshold.

[0083] S320. Based on the noise difference, the comprehensive index of each fan, and the predicted speed of each fan, obtain the target speed of each fan; execute step S325.

[0084] S321. Determine whether the comprehensive index of each fan is greater than or equal to zero; if yes, proceed to step S322; if no, proceed to step S323.

[0085] S322. Determine the predicted speed of each fan as the target speed of each fan.

[0086] S323. Fans with comprehensive indicators less than zero are classified as Class IV fans, and fans with comprehensive indicators greater than or equal to zero are classified as Class V fans.

[0087] S324. The sum of the predicted speed and the preset speed of the fourth type of fan is determined as the target speed of the fourth type of fan, and the predicted speed of the fifth type of fan is determined as the target speed of the fifth type of fan; proceed to step S325.

[0088] S325. Obtain the target total noise level and total exhaust volume of the range hood based on the target speed of each fan.

[0089] S326. Determine whether the target total noise value is less than or equal to the preset noise threshold and whether the total exhaust volume is greater than the preset exhaust volume; if yes, proceed to step S327; if no, return to step S314.

[0090] Specifically, after adjusting the speed of at least some of the fans, for example, reducing the speed of some fans from the predicted speed, it may still result in the target total noise value generated by the range hood exceeding the standard when all fans are running at the adjusted target speed. It may also lead to the total exhaust volume of the range hood not meeting the standard, thus failing to effectively remove smoke. Therefore, after adjusting the speed of at least some of the fans, the corresponding target total noise value and total exhaust volume can be obtained again. For example, the calculation method for the target total noise value can be the same as the calculation method for the predicted total noise value in the above embodiments, and will not be repeated here.

[0091] The total exhaust volume of the range hood can be obtained based on the exhaust volume calculation formula and the target speed of each fan. The exhaust volume calculation formula is: Q total =Σ(k i ×n inew ), where k i Let n be the flow coefficient of the i-th fan. inew Let be the target rotational speed of the i-th fan.

[0092] S327. Control the operation of each fan according to the target speed of each fan.

[0093] Specifically, after adjusting the speed of at least some of the fans, if the target total noise value is less than or equal to the preset noise threshold and the total exhaust volume is greater than the preset exhaust volume, it means that after adjusting the speed of at least some of the fans, the target total noise value has not exceeded the standard and the total exhaust volume meets the standard. At this time, control each fan to operate stably at the determined target speed to ensure that the fan operation meets the noise standard and can efficiently exhaust oil fumes, thus achieving the dual goals of noise control and smoke exhaust effectiveness.

[0094] If, after adjusting the speed of at least some of the fans, the target total noise value exceeds the preset noise threshold, the process can return to the step of continuously acquiring oil fume information from each cooking zone while the range hood is running, in order to redetermine the target speed of each fan. Alternatively, in another feasible embodiment, the speed of the fan with the higher overall performance index can be reduced from the current target speed to lower the target total noise value, or the speed of the fan corresponding to the cooking zone with low oil fume concentration can be reduced to lower the target total noise value.

[0095] Alternatively, after adjusting the speed of at least some fans, if the total exhaust volume is less than or equal to the preset exhaust volume, it indicates that the total exhaust volume is not up to standard. In this case, the process can return to the step of continuously acquiring oil fume information from each cooking zone while the range hood is running, in order to redetermine the target speed of each fan. Alternatively, in another feasible embodiment, the speed of the fan with the lower overall index can be increased based on the current target speed to increase the total exhaust volume, or the speed of the fan corresponding to the cooking zone with higher oil fume concentration can be increased to increase the total exhaust volume.

[0096] Alternatively, after adjusting the speed of at least some of the fans, if the target total noise value exceeds the preset noise threshold and the total exhaust volume is less than or equal to the preset exhaust volume, it indicates that the target total noise value does not meet the noise standard and the total exhaust volume is also substandard. In this case, the process of continuously acquiring the oil fume information of each cooking area while the range hood is running can be returned to redetermine the target speed of each fan.

[0097] 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 a range hood, characterized in that, The range hood includes multiple branch ducts and fans respectively installed in each of the branch ducts. The air inlets of each branch duct are located above different cooking areas. The range hood control method includes: While the range hood is running, it continuously acquires information about the fumes from each of the cooking zones. The predicted rotational speed of each fan is obtained based on the oil fume information of each cooking area; The predicted total noise value of the range hood is obtained based on the predicted rotational speed of each of the aforementioned fans; When the predicted total noise value is greater than the preset noise threshold, the target speed of each fan is obtained based on the predicted total noise value, the preset noise threshold, the predicted speed of each fan, and the oil fume information of each cooking area. The operation of each fan is controlled according to the target speed of each fan.

2. The control method for a range hood according to claim 1, characterized in that, The oil fume information includes the oil fume concentration; Based on the predicted total noise value, the preset noise threshold, the predicted rotational speed of each of the fans, and the oil fume information of each cooking zone, the target rotational speed of each fan is obtained, including: Based on the predicted rotational speed of each fan and the oil fume concentration in each cooking zone, a comprehensive index of each fan is obtained. Obtain the noise difference between the predicted total noise value and the preset noise threshold; The target speed of each wind turbine is obtained based on the noise difference, the comprehensive index of each wind turbine, and the predicted speed of each wind turbine.

3. The control method for a range hood according to claim 2, characterized in that, The aforementioned fans are classified as Class I fans, Class II fans, and Class III fans. The comprehensive performance index of Class I fans is greater than that of Class II fans, and the comprehensive performance index of Class II fans is greater than that of Class III fans. Based on the noise difference, the comprehensive indicators of each wind turbine, and the predicted rotational speed of each wind turbine, the target rotational speed of each wind turbine is obtained, including: When the noise difference is greater than zero and less than or equal to a first preset difference, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the predicted speed of the second type of fan is determined as the target speed of the second type of fan, and the predicted speed of the third type of fan is determined as the target speed of the third type of fan. When the noise difference is greater than a first preset difference and less than or equal to a second preset difference, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the difference between the predicted speed and the preset speed of the second type of fan is determined as the target speed of the second type of fan, and the predicted speed of the third type of fan is determined as the target speed of the third type of fan. When the noise difference is greater than the second preset difference, the difference between the predicted speed and the preset speed of the first type of fan is determined as the target speed of the first type of fan, the difference between the predicted speed and the preset speed of the second type of fan is determined as the target speed of the second type of fan, and the difference between the predicted speed and the preset speed of the third type of fan is determined as the target speed of the third type of fan. Wherein, the second preset difference is greater than the first preset difference, and the first preset difference is greater than zero.

4. The control method for a range hood according to claim 1, characterized in that, After obtaining the target speed of each fan based on the predicted total noise value, the preset noise threshold, the predicted speed of each fan, and the oil fume information of each cooking zone, and before controlling the operation of each fan according to the target speed of each fan, the method further includes: The target total noise level and total exhaust volume of the range hood are obtained based on the target rotation speed of each of the aforementioned fans; Determine whether the target total noise value is less than or equal to the preset noise threshold, and whether the total exhaust volume is greater than the preset exhaust volume; If so, then the step of controlling the operation of each of the wind turbines according to the target speed of each wind turbine is performed; If not, return to the step of continuously acquiring oil fume information of each cooking zone during the operation of the range hood.

5. The control method for a range hood according to claim 1, characterized in that, The oil fume information includes the oil fume concentration; The control method for the range hood further includes: when the predicted total noise value is less than or equal to the preset noise threshold, obtaining a comprehensive index of each fan based on the predicted rotation speed of each fan and the oil fume concentration of each cooking zone; Determine whether the comprehensive indicators of each of the aforementioned fans are all greater than or equal to zero; If so, the predicted speed of each of the aforementioned wind turbines shall be determined as the target speed of each of the aforementioned wind turbines; If not, then each of the wind turbines with a comprehensive index less than zero is identified as a fourth type of wind turbine, and each of the wind turbines with a comprehensive index greater than or equal to zero is identified as a fifth type of wind turbine. The sum of the predicted speed and the preset speed of the fourth type of wind turbine is determined as the target speed of the fourth type of wind turbine, and the predicted speed of the fifth type of wind turbine is determined as the target speed of the fifth type of wind turbine.

6. The control method for a range hood according to claim 5, characterized in that, When determining the target speed of the fourth type of fan by summing the predicted speed and the preset speed, and determining the target speed of the fifth type of fan by the predicted speed, after controlling the operation of each fan according to the target speed of each fan, the method further includes: Obtain the duration for which each of the aforementioned wind turbines operates at the current target rotational speed; When the duration reaches the preset time, return to the step of continuously acquiring the oil fume information of each cooking area during the operation of the range hood.

7. The control method for a range hood according to claim 2 or 5, characterized in that, Based on the predicted rotational speed of each fan and the oil fume concentration in each cooking zone, a comprehensive index of each fan is obtained, including: Obtain the formula for calculating the comprehensive index; Based on the comprehensive index calculation formula, the comprehensive index of each fan is obtained according to the predicted rotation speed of each fan and the oil fume concentration of each cooking zone; The formula for calculating the comprehensive index is: P i =α×n i / n max -β×S i / S max ; Among them, P i Let n be the comprehensive index of the i-th wind turbine. i S is the predicted rotational speed of the i-th fan. i Let be the oil fume concentration in the cooking area corresponding to the i-th fan, α be the weighting coefficient of the predicted rotation speed, β be the weighting coefficient of the oil fume concentration, and n be the weighting coefficient of the oil fume concentration. max The normalization factor for the predicted rotational speed, S max The normalization factor for the oil fume concentration is denoted as .

8. The control method for a range hood according to claim 1, characterized in that, The predicted total noise value of the range hood is obtained based on the predicted rotational speed of each of the aforementioned fans, including: The predicted noise value of each fan is obtained based on the predicted rotational speed of each fan. Obtain the formula for calculating total noise; Based on the total noise calculation formula, the predicted total noise value of the range hood is obtained according to the predicted noise values ​​of each fan. The formula for calculating the total noise is: Among them, L total Let L be the predicted total noise value, Li be the noise value of the i-th fan, and ΔL be the noise value of the i-th fan. phase q represents the phase interference correction value, and q represents the number of fans in the range hood.

9. The control method for a range hood according to claim 1, characterized in that, The oil fume information includes a first oil fume concentration, a second oil fume concentration, an oil fume diffusion direction, and an oil fume diffusion speed; Continuously acquire cooking fume information from each of the aforementioned cooking zones, including: Continuously acquire first image information and oil fume sensing information of each of the cooking areas; Based on the first image information, the first oil fume concentration, oil fume diffusion direction, and oil fume diffusion speed of each cooking area are obtained; The second oil fume concentration of each cooking zone is obtained based on the oil fume sensing information; The predicted rotational speed of each fan is obtained based on the oil fume information of each cooking zone, including: An overall oil fume distribution map is obtained based on the first oil fume concentration, the oil fume diffusion direction, the oil fume diffusion speed, and the second oil fume concentration; Obtain a deep learning model for predicting rotational speed; Based on the deep learning model, the predicted rotational speed of each fan is obtained according to the overall oil fume distribution map.

10. The control method for a range hood according to claim 1, characterized in that, Before the range hood starts operating, it also includes: When the range hood is started, second image information of each of the cooking areas is acquired; The types of cooking utensils located in each of the cooking areas are obtained based on the second image information. The initial target rotational speed of each fan is obtained according to the type of cooking appliance.

11. A range hood, characterized in that, include: A controller, multiple air ducts, and fans respectively installed in each of the air ducts; Each of the aforementioned air ducts corresponds to a different cooking area; The controller is used to execute the control method of the range hood according to any one of claims 1 to 10.

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