Gas stove and range hood linkage control system

Abstract

The invention provides a gas stove and smoke exhaust ventilator linkage control system, which comprises an image acquisition module configured to acquire a cooking bench area image; the image processing module is configured to obtain flame characteristics by using color characteristics of flame based on the cooking bench area image; based on the cooking bench area image, utilizing imaging features to obtain food material features; on the basis of the cooking bench area image, the density and diffusion speed of oil smoke are obtained through an inter-frame pixel change rate analysis method and an optical flow method; the control module is configured to adjust the opening degree of a gas valve of the gas stove according to the flame characteristics and the food material characteristics; according to the density and the diffusion speed of the oil smoke, the suction force of the range hood is adjusted, so that the problem that the opening degree of a gas valve of the gas stove and the suction force of the range hood cannot be adjusted in a linkage mode through an existing gas stove and the range hood is solved.

Description

Technical Field

[0001] The present application relates to the technical field of household appliances, and in particular to a gas stove and range hood linkage control system. Background Art

[0002] In the kitchen, range hoods and gas stoves are core appliances in the cooking process, and their intelligence directly impacts cooking convenience, safety, and efficiency. Currently, range hoods are manually adjusted by the user, adjusting the suction power based on actual changes in oil smoke. Meanwhile, gas stove power is manually determined by a regulating valve, based on the food's state and the user's desired heat level.

[0003] To achieve intelligent cooking, a combination of infrared, temperature, and gas sensors is currently being incorporated into range hoods and gas stoves. Infrared sensors detect pot bottom temperature, temperature sensors monitor ambient temperature or temperature fluctuations in specific areas, and gas sensors detect fume concentrations or harmful gas levels in the kitchen. This synergy allows range hoods and gas stoves to automatically adjust the range hood's extraction power and the stove's heat output to a certain extent.

[0004] However, current sensor applications use a large number of sensors, resulting in complex and costly system solutions. Furthermore, as the number of sensors increases, the probability of system failure also increases. Secondly, the lack of monitoring capabilities for the state of food and flames within the pot makes it impossible to accurately determine whether the food is boiling, burning, or burning out of control, thus failing to effectively prevent safety incidents such as food overflowing and burning. Furthermore, the linkage function between current range hoods and gas stoves is relatively simple, typically only enabling simple adjustments when the pot temperature overheats or the fume concentration reaches a fixed standard. It is unable to automatically and accurately adjust the firepower and range hood suction force based on real-time changes in food state and fume concentration, and is even more unable to promptly issue an alarm and coordinate actions in the event of a combustion accident. Summary of the Invention

[0005] The present application provides a gas stove and range hood linkage control system to solve the technical problem that the existing gas stove and range hood cannot be linked to adjust the gas valve opening of the gas stove and the suction force of the range hood.

[0006] The present application provides a gas stove and range hood linkage control system, which is applied to a gas stove and a range hood, wherein the gas stove is located below the range hood; the range hood completely covers the gas stove in the direction of the gas stove; and comprises:

[0007] An image acquisition module is provided below the range hood and is configured to:

[0008] Collect images of the stove area;

[0009] An image processing module, connected to the image acquisition module, configured to:

[0010] Based on the stove area image, using the color characteristics of the flame, a flame feature is obtained; the flame feature includes: the area ratio of the flame in the stove area image and the color temperature value of the stove area image;

[0011] Based on the stove area image, the imaging features are used to obtain food features; the food features include: bubble density on the surface of the liquid in the pot, and the splash area of ​​the liquid in the pot;

[0012] Based on the stove area image, the density and diffusion speed of the oil smoke are obtained by using the inter-frame pixel change rate analysis method and the optical flow method;

[0013] A control module, connected to the image processing module, configured to:

[0014] adjusting the gas valve opening of the gas stove according to the flame characteristics and the food characteristics;

[0015] The suction force of the range hood is adjusted according to the density and diffusion speed of the oil smoke.

[0016] In some embodiments, the image processing module is further configured to:

[0017] Based on the stove area image, performing threshold segmentation using the color characteristics of the flame to obtain the flame area in the stove area image;

[0018] Based on the flame area, calculating the area ratio of the flame located in the stove area image;

[0019] Color analysis is performed on pixels within the flame area, and RGB values ​​within the flame area are converted into color temperature values.

[0020] In some embodiments, the control module is further configured to:

[0021] If the area ratio of the flame area in the stove area image is less than the preset area ratio, closing the gas valve;

[0022] Acquire two images of the stove area within a preset time, and calculate the difference in area ratio of the flame area in the two images of the stove area;

[0023] If the area ratio difference is greater than the preset area ratio difference, the gas valve is controlled to reduce the gas valve opening according to the preset gear.

[0024] In some embodiments, the system further comprises:

[0025] An alarm module, the alarm module is connected to the control module, and the control module is further configured to:

[0026] If the color temperature value is less than the preset color temperature value, the alarm module is controlled to emit an alarm sound; and the carbon monoxide warning information is sent to a setting device; the setting device is an electronic device that can receive electronic information.

[0027] In some embodiments, the image processing module is further configured to:

[0028] Obtaining the saturation and brightness of the stove area image;

[0029] Based on the stove area image, threshold segmentation is performed using imaging features to obtain pot features; the pot features include: pot edge size, edge size, image and color of the food in the pot;

[0030] Based on the characteristics of the pot, using the optical flow method, calculating the bubble density on the surface of the liquid in the pot;

[0031] Based on the cookware feature, obtaining a color value of the food image;

[0032] Based on the pot features, using an inter-frame difference method, obtaining pixel points of the outer edge of the pot;

[0033] Based on the pixel points, a splash area of ​​the liquid in the pot is calculated.

[0034] In some embodiments, the control module is further configured to:

[0035] If the bubble density on the surface of the liquid in the cookware is greater than the preset bubble density and the duration is greater than the preset time, the gas valve is controlled to reduce the gas valve opening according to the preset gear.

[0036] In some embodiments, the control module is further configured to:

[0037] If the saturation of the stove area image is greater than a first preset value and the brightness is less than a second preset value, obtaining two stove area images within a preset time, and calculating the color change values ​​of the food images in the two stove area images;

[0038] If the color change value shows an increasing trend and the increasing value is greater than a third preset value, the gas valve is closed; and the alarm module is controlled to emit an alarm sound.

[0039] In some embodiments, the control module is further configured to:

[0040] If the splashing area of ​​the liquid in the pot is larger than the preset splashing area, the gas valve is controlled to reduce the gas valve opening according to the preset gear.

[0041] In some embodiments, the image processing module is further configured to:

[0042] Based on the stove area image, the density of the oil smoke is obtained by using an inter-frame pixel change rate analysis method;

[0043] Based on the stove area image, using the optical flow method, obtaining the motion vector of the oil smoke;

[0044] The diffusion speed of the oil smoke is obtained according to the motion vector.

[0045] In some embodiments, the range hood is provided with a first gear, a second gear, and a third gear; when the range hood is in the first gear, the suction force of the range hood is less than that of the range hood in the second gear, and when the range hood is in the second gear, the suction force of the range hood is less than that of the range hood in the third gear;

[0046] The control module is further configured to:

[0047] If the density of the oil smoke is greater than a fourth preset value and less than a fifth preset value, and the diffusion speed of the oil smoke is less than a sixth preset value, controlling the range hood to operate at the second gear;

[0048] If the density of the oil smoke is greater than the fifth preset value and the diffusion speed of the oil smoke is greater than the sixth preset value, controlling the range hood to operate at the third gear;

[0049] If the density of the oil smoke is less than the fourth preset value and the diffusion speed of the oil smoke is less than the sixth preset value, the range hood is controlled to operate at the first gear.

[0050] The present application provides a gas stove and range hood linkage control system, which is applied to a gas stove and a range hood, wherein the gas stove is located below the range hood; the range hood completely covers the gas stove in the direction of the gas stove; the control system comprises: an image acquisition module, the image acquisition module is arranged below the range hood, the image acquisition module is configured to: acquire an image of the stove area; an image processing module, the image processing module is connected to the image acquisition module, the image processing module is configured to: obtain flame characteristics based on the stove area image using the color characteristics of the flame; the flame characteristics include: the area ratio of the flame in the stove area image, the color characteristics of the stove area image, the color characteristics of the flame ... Color temperature value; based on the stove area image, the imaging features are used to obtain food features; the food features include: bubble density on the surface of the liquid in the pot, and the splash area of ​​the liquid in the pot; based on the stove area image, the density and diffusion speed of the oil smoke are obtained by using the inter-frame pixel change rate analysis method and the optical flow method; a control module, the control module is connected to the image processing module, and the control module is configured to: adjust the gas valve opening of the gas stove according to the flame features and the food features; adjust the suction force of the range hood according to the density and diffusion speed of the oil smoke, so that the gas stove and the range hood can jointly adjust the gas valve opening of the gas stove and the suction force of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solution of the present application, the following is a brief introduction to the drawings required for use in the embodiments. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0052] Figure 1 This is a schematic diagram of the structure of the gas stove and range hood linkage control system in this application;

[0053] Figure 2 This is a flow chart of the gas stove and range hood linkage control method based on flame characteristics in this application;

[0054] Figure 3 This is a flow chart of the method for controlling the linkage between a gas stove and a range hood based on food characteristics in this application;

[0055] Figure 4 This is a flow chart of the gas stove and range hood linkage control method based on oil smoke characteristics in this application.

[0056] Description of reference numerals:

[0057] 1-Image acquisition module; 2-Image processing module; 3-Control module; 4-Alarm module. DETAILED DESCRIPTION

[0058] In order to enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of this application.

[0059] Because in some technologies, the gas stove and the range hood cannot be linked to adjust the gas valve opening of the gas stove and the suction force of the range hood, in order to solve this technical problem, the present application provides a gas stove and range hood linkage control system. The following describes the structure of each part of the gas stove and range hood linkage control system:

[0060] like Figure 1 The figure shows the structure of the gas stove and range hood linkage control system in this application.

[0061] The present application provides a gas stove and range hood linkage control system, which is applied to a gas stove and a range hood, wherein the gas stove is located below the range hood; the range hood completely covers the gas stove in the direction of the gas stove; and comprises:

[0062] Image acquisition module 1, which is disposed below the range hood and is configured as follows:

[0063] Capture an image of the stovetop area; the image of the stovetop area shows the gas stove, the pot on the gas stove, and the oil smoke above the pot. Use an image acquisition tool, such as a camera, mounted above the gas stove to capture the stovetop area at 30 fps to obtain a visible light image, i.e., the stovetop area image.

[0064] Image processing module 2, the image processing module 2 is connected to the image acquisition module 1, and the image processing module 2 is configured to:

[0065] Based on the stove area image, the flame characteristics are obtained using the color characteristics of the flame; the flame characteristics include: the area ratio of the flame located in the stove area image and the color temperature value of the stove area image; based on the stove area image, the food characteristics are obtained using the imaging characteristics; the food characteristics include: the bubble density on the surface of the liquid in the pot and the splash area of ​​the liquid in the pot; based on the stove area image, the density and diffusion speed of the oil smoke are obtained using the inter-frame pixel change rate analysis method and the optical flow method.

[0066] The control module 3 is connected to the image processing module 2 and is configured to:

[0067] According to the flame characteristics and the food characteristics, the gas valve opening of the gas stove is adjusted; according to the density and diffusion speed of the oil smoke, the suction force of the range hood is adjusted.

[0068] The present application provides a gas stove and range hood linkage control system, which monitors the gas stove fire power, oil fume concentration and the state of food in the pot in real time through the image acquisition module 1 (camera), and automatically adjusts the gas stove fire power and range hood operating parameters to achieve linkage control of the gas stove and range hood.

[0069] like Figure 2 As shown, it is a flow chart of the gas stove and range hood linkage control method based on flame characteristics in this application.

[0070] In this embodiment, the image processing module 2 is further configured to:

[0071] Based on the stove area image, threshold segmentation is performed using the color features of the flame to obtain the flame area in the stove area image; threshold segmentation can be performed using the color features of the flame to segment the flame area in the stove area image, thereby obtaining the flame area in the stove area image; based on the flame area, the area ratio of the flame located in the stove area image is calculated; color analysis is performed on the pixels in the flame area, and the RGB values ​​in the flame area are converted into color temperature values.

[0072] In this embodiment, the control module 3 is further configured to:

[0073] If the area ratio of the flame area located in the stove area image is less than the preset area ratio, the gas valve is closed; it can be understood that when the area ratio of the flame area located in the stove area image is less than the preset area ratio, it is characterized by a small flame on the gas stove, which is easy to cause carbon monoxide leakage. Therefore, in order to prevent carbon monoxide leakage, when the area ratio of the flame area located in the stove area image is less than the preset area ratio, the control module 3 controls the gas valve to close, thereby preventing the user from causing carbon monoxide poisoning.

[0074] Two images of the stove area are acquired within a preset time period, and the difference in the area ratio of the flame area within the two images is calculated; if the area ratio difference is greater than the preset area ratio difference, the gas valve is controlled to reduce the gas valve opening according to a preset gear. One stove area image is acquired per second. If one second contains several frames of images, the last frame of the stove area image is selected, and the difference in the area ratio of the flame area within the two images is calculated; if the area ratio difference is greater than the preset area ratio difference, the gas valve is controlled to reduce the gas valve opening according to a preset gear to prevent the food in the pot from overflowing. It is understood that a sudden increase in the flame can cause the pot to overflow. By using the above method of calculating the area ratio difference, the flame size is controlled to prevent overflow.

[0075] In this embodiment, the system further comprises:

[0076] The alarm module 4 is connected to the control module 3. The control module 3 is further configured to:

[0077] If the color temperature value is less than the preset color temperature value, the alarm module 4 is controlled to emit an alarm sound; and the carbon monoxide warning information is sent to the setting device; the setting device is an electronic device that can receive electronic information. A small color temperature value corresponds to a low flame temperature. In a low temperature environment, the fuel combustion reaction speed is slow, and the mixing and reaction of oxygen and fuel are insufficient. Taking the combustion of natural gas as an example, if its main component methane cannot be completely burned due to insufficient oxygen, carbon monoxide will be generated first, and the carbon monoxide will continue to burn after contacting oxygen. When the flame temperature is low, it is difficult for carbon monoxide to be fully burned after it is generated, resulting in the accumulation of carbon monoxide in the combustion products. Therefore, if the color temperature value is less than the preset color temperature value, it means that the gas stove is prone to produce carbon monoxide. This application uses the alarm module 4 to emit an alarm sound to remind the user, thereby preventing the user from causing carbon monoxide poisoning.

[0078] Specifically, in the stove area image, the flame color characteristics are used to perform threshold segmentation to identify the flame area. Morphological operations (denoising and filling) are performed on the segmented binary image to calculate the pixel area of ​​the flame area. If the area reaches the background threshold (<5%), the gas valve is closed.

[0079] In the stove area image, the pixels within the flame area are analyzed for color and converted from RGB values ​​to color temperature values. When the color temperature reaches the background threshold (<2000K), the alarm module 4 is controlled to sound an alarm and send a carbon monoxide warning message to the designated device.

[0080] In the stove area image, the fluctuation of the flame area change per second is compared. If the fluctuation reaches the background threshold (>2 Hz), the gas valve is controlled to reduce the gas valve opening according to the preset gear.

[0081] like Figure 3 Shown is a flow chart of the method for controlling the linkage between a gas stove and a range hood based on food characteristics in this application.

[0082] In this embodiment, the image processing module 2 is further configured to:

[0083] Obtain the saturation and brightness of the stove area image; based on the stove area image, perform threshold segmentation using imaging features to obtain pot features; the pot features include: pot edge size, and the edge size, image, and color of the food in the pot; based on the pot features, use the optical flow method to calculate the bubble density on the surface of the liquid in the pot; based on the pot features, obtain the color value of the food image; based on the pot features, use the inter-frame difference method to obtain the pixel points of the outer edge of the pot; and based on the pixel points, calculate the splash area of ​​the liquid in the pot.

[0084] In this embodiment, the control module 3 is further configured to:

[0085] If the bubble density on the surface of the liquid in the cookware is greater than a preset bubble density and persists for longer than a preset time, the gas valve is controlled to reduce its opening according to a preset level. The bubble density can be used to determine the boiling level of the liquid in the cookware. When the bubble density is greater than the preset bubble density, it indicates that the boiling level of the liquid in the cookware is high. Therefore, by controlling the gas valve to reduce its opening according to the preset level, the flame size of the gas stove is reduced, thereby preventing the liquid in the cookware from overflowing.

[0086] In this embodiment, the control module 3 is further configured to:

[0087] If the saturation of the stovetop area image is greater than a first preset value and the brightness is less than a second preset value, two stovetop area images are acquired within a preset time period and the color change value of the food image in the two stovetop area images is calculated. If the color change value shows an increasing trend and the increase value is greater than a third preset value, the gas valve is closed and the alarm module 4 is controlled to emit an alarm. The saturation and brightness of the stovetop area image and the color change value of the food image can be used to determine whether the food in the pot is burnt. If the saturation of the stovetop area image is greater than a first preset value, the brightness is less than a second preset value, and the color change value shows an increasing trend and the increase value is greater than a third preset value, indicating that the food in the pot is burnt, the gas valve is immediately closed and the alarm module 4 is controlled to emit an alarm to remind the user to quickly clean the food in the pot.

[0088] In this embodiment, the control module 3 is further configured to:

[0089] If the splashing area of ​​the liquid in the pot is larger than a preset splashing area, the gas valve is controlled to reduce its opening according to a preset gear. The boiling level of the liquid in the pot can be determined by the splashing area of ​​the liquid in the pot. When the splashing area of ​​the liquid in the pot is larger than the preset splashing area, it indicates that the boiling level of the liquid in the pot is high, so the gas valve is controlled to reduce its opening according to a preset gear to prevent splashing of the liquid in the pot.

[0090] Specifically, in the stove area image, the imaging features are used to perform threshold segmentation to identify the edge size of the pot, the edge size of the food, the content and color of the food; the surface motion vector of the liquid in the pot is analyzed by the optical flow method, and the bubble generation rate (unit: per second) is calculated. When the bubble density is detected to be greater than 150 / m 2 When the temperature continues for 3 seconds, boiling determination is triggered, and the gas valve is controlled to reduce the gas valve opening according to a preset gear.

[0091] In the stove area image, if the image saturation S>70 and the image brightness V<30 (dark brown / black), and the color value of the food image increases by>30, a burnt judgment is triggered. The flame is turned off and the alarm module 4 is controlled to sound an alarm.

[0092] In the stove area image, the inter-frame difference method is used to capture the moving pixels outside the pot edge. When the splash area is greater than 5cm 2 When it is determined that there is a risk of over-boiling and overflowing, the gas valve is controlled to reduce the gas valve opening according to the preset gear.

[0093] like Figure 4 The figure shows a flow chart of the method for controlling the linkage between a gas stove and a range hood based on oil smoke characteristics in this application.

[0094] In this embodiment, the image processing module 2 is further configured to:

[0095] Based on the stove area image, the density of the oil smoke is obtained using the inter-frame pixel change rate analysis method; based on the stove area image, the motion vector of the oil smoke is obtained using the optical flow method; and based on the motion vector, the diffusion speed of the oil smoke is obtained.

[0096] In this embodiment, the range hood has a first gear, a second gear, and a third gear. When in the first gear, the range hood's suction force is less than when in the second gear, and when in the second gear, the range hood's suction force is less than when in the third gear. A greater suction force means a greater ability to extract oil fumes.

[0097] The control module 3 is further configured to:

[0098] If the density of the oil smoke is greater than the fourth preset value and less than the fifth preset value, and the diffusion speed of the oil smoke is less than the sixth preset value, the range hood is controlled to operate at the second gear; if the density of the oil smoke is greater than the fifth preset value, and the diffusion speed of the oil smoke is greater than the sixth preset value, the range hood is controlled to operate at the third gear; if the density of the oil smoke is less than the fourth preset value, and the diffusion speed of the oil smoke is less than the sixth preset value, the range hood is controlled to operate at the first gear.

[0099] Specifically, within the stovetop area image, inter-frame pixel change rate analysis is used to monitor oil fume density. Optical flow is used to track the motion vector of oil fume clouds and identify their diffusion speed. Oil fume density monitoring is divided into three levels: high, medium, and low. Diffusion speed is divided into two levels: fast and slow. A flow rate above 0.5 m / s is considered fast, while a flow rate below 0.5 m / s is considered slow.

[0100] Among them, if the density of oil smoke is medium and the diffusion speed of oil smoke is slow, the range hood automatically enters the medium wind speed mode, that is, the second gear operation; if the density of oil smoke is high and the diffusion speed of oil smoke is fast, the range hood automatically enters the high wind speed mode, that is, the third gear operation; if the density of oil smoke is low and the diffusion speed of oil smoke is slow, the range hood automatically enters the low wind speed mode, that is, the first gear operation.

[0101] The above specific implementation methods further explain in detail the purpose, technical solutions and beneficial effects of the embodiments of the present application. It should be understood that the above are only specific implementation methods of the embodiments of the present application and are not intended to limit the scope of protection of the embodiments of the present application. Any modifications, equivalent replacements, improvements, etc. made on the basis of the technical solutions of the embodiments of the present application should be included in the scope of protection of the embodiments of the present application.

Claims

1. A gas stove and range hood linkage control system, applied to a gas stove and a range hood, wherein the gas stove is located below the range hood; the range hood completely covers the gas stove in the direction of the gas stove; characterized in that: include: An image acquisition module (1), the image acquisition module (1) being arranged below the range hood, the image acquisition module (1) being configured to: Collect images of the stove area; An image processing module (2), the image processing module (2) being connected to the image acquisition module (1), and the image processing module (2) being configured to: Based on the stove area image, flame features are obtained using flame color features; The flame features include: the area ratio of the flame in the stove area image and the color temperature value of the stove area image; Based on the stove area image, the imaging features are used to obtain food features; the food features include: bubble density on the surface of the liquid in the pot, and the splash area of ​​the liquid in the pot; Based on the stove area image, the density and diffusion speed of the oil smoke are obtained by using the inter-frame pixel change rate analysis method and the optical flow method; A control module (3), the control module (3) being connected to the image processing module (2), and the control module (3) being configured to: adjusting the gas valve opening of the gas stove according to the flame characteristics and the food characteristics; The suction force of the range hood is adjusted according to the density and diffusion speed of the oil smoke.

2. A gas stove and range hood linkage control system according to claim 1, characterized in that: The image processing module (2) is further configured to: Based on the stove area image, performing threshold segmentation using the color characteristics of the flame to obtain the flame area in the stove area image; Based on the flame area, calculating the area ratio of the flame located in the stove area image; Color analysis is performed on pixels within the flame area, and RGB values ​​within the flame area are converted into color temperature values.

3. A gas stove and range hood linkage control system according to claim 2, characterized in that: The control module (3) is further configured to: If the area ratio of the flame area in the stove area image is less than the preset area ratio, closing the gas valve; Acquire two images of the stove area within a preset time, and calculate the difference in area ratio of the flame area in the two images of the stove area; If the area ratio difference is greater than the preset area ratio difference, the gas valve is controlled to reduce the gas valve opening according to the preset gear.

4. A gas stove and range hood linkage control system according to claim 2, characterized in that: The system further comprises: An alarm module (4), the alarm module (4) being connected to the control module (3), the control module (3) being further configured to: If the color temperature value is less than a preset color temperature value, the alarm module (4) is controlled to emit an alarm sound; and carbon monoxide warning information is sent to a setting device; the setting device is an electronic device capable of receiving electronic information.

5. A gas stove and range hood linkage control system according to claim 4, characterized in that: The image processing module (2) is further configured to: Obtaining the saturation and brightness of the stove area image; Based on the stove area image, threshold segmentation is performed using imaging features to obtain pot features; the pot features include: pot edge size, edge size, image and color of the food in the pot; Based on the characteristics of the pot, using the optical flow method, calculating the bubble density on the surface of the liquid in the pot; Based on the cookware feature, obtaining a color value of the food image; Based on the pot features, using an inter-frame difference method, obtaining pixel points of the outer edge of the pot; Based on the pixel points, a splash area of ​​the liquid in the pot is calculated.

6. A gas stove and range hood linkage control system according to claim 5, characterized in that: The control module (3) is further configured to: If the bubble density on the surface of the liquid in the cookware is greater than the preset bubble density and the duration is greater than the preset time, the gas valve is controlled to reduce the gas valve opening according to the preset gear.

7. The gas stove and range hood linkage control system according to claim 5, characterized in that: The control module (3) is further configured to: If the saturation of the stove area image is greater than a first preset value and the brightness is less than a second preset value, obtaining two stove area images within a preset time, and calculating the color change values ​​of the food images in the two stove area images; If the color change value shows an increasing trend and the increasing value is greater than a third preset value, the gas valve is closed; and the alarm module (4) is controlled to emit an alarm sound.

8. The gas stove and range hood linkage control system according to claim 5, characterized in that: The control module (3) is further configured to: If the splashing area of ​​the liquid in the pot is larger than the preset splashing area, the gas valve is controlled to reduce the gas valve opening according to the preset gear.

9. The gas stove and range hood linkage control system according to claim 1, characterized in that: The image processing module (2) is further configured to: Based on the stove area image, the density of the oil smoke is obtained by using an inter-frame pixel change rate analysis method; Based on the stove area image, using the optical flow method, obtaining the motion vector of the oil smoke; The diffusion speed of the oil smoke is obtained according to the motion vector.

10. The gas stove and range hood linkage control system according to claim 1, characterized in that: The range hood is provided with a first gear, a second gear, and a third gear; when the range hood is in the first gear, the suction force of the range hood is smaller than that of the range hood in the second gear, and when the range hood is in the second gear, the suction force of the range hood is smaller than that of the range hood in the third gear; The control module (3) is further configured to: If the density of the oil smoke is greater than a fourth preset value and less than a fifth preset value, and the diffusion speed of the oil smoke is less than a sixth preset value, controlling the range hood to operate at the second gear; If the density of the oil smoke is greater than the fifth preset value and the diffusion speed of the oil smoke is greater than the sixth preset value, controlling the range hood to operate at the third gear; If the density of the oil smoke is less than the fourth preset value and the diffusion speed of the oil smoke is less than the sixth preset value, the range hood is controlled to operate at the first gear.

Images