A control method for an oil fume machine, the oil fume machine and an exhaust system

Abstract

The present invention relates to the technical field of intelligent household appliances, and particularly to a control method for a range hood, a range hood, and an exhaust system. The method is applied to a range hood and includes: controlling an infrared camera to collect an image of the stove area below the range hood at a first frequency to obtain a first image; transmitting the collected first image to a mobile terminal communicating with the range hood; obtaining a returned first recognition result, and if the first recognition result is a simmering state and / or a dry burning state, controlling the infrared camera to collect an image of the stove area below the range hood at a second frequency to obtain a second image and transmitting it to the mobile terminal; obtaining a returned second recognition result and the status information of the mobile terminal; judging whether the mobile terminal is in an idle state according to the status information, and if so and the second recognition result is that there is an intervention operation, controlling the exhaust fan to operate at an overspeed for a set duration t. The method provided by the present invention controls the exhaust fan to operate at an overspeed based on image recognition to suck the suddenly increased oil fume.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent household appliances, and particularly to a control method for a range hood, a range hood, and an exhaust system. Background Art

[0002] One of the characteristics of Chinese cuisine is high oil and high salt, with a relatively strong taste. Another characteristic is cooking with an open flame. These two characteristics make the cooking process of most foods produce a large amount of oil fume. A common means to solve the oil fume problem is to use a range hood, which uses the negative pressure generated by the range hood to suck and discharge the smoke generated during the cooking process.

[0003] The existing range hood has a relatively simple structure, mainly including an air duct and an exhaust fan. The exhaust fan is arranged in the air duct. When the exhaust fan is started to form a negative pressure in the air duct, the oil fume at the air duct inlet is sucked into the air duct and discharged along the air duct. When the oil fume is less, this method can play a good role in extracting oil fume. However, when the oil fume suddenly increases, the range hood cannot adaptively adjust the working mode, resulting in the oil fume spilling in the kitchen.

[0004] The existing technology provides some intelligent range hoods that control the operation of the range hood by detecting whether the oil fume content reaches a set value. However, in scenarios such as opening the lid, heating the pan and pouring oil or water, a large amount of oil fume is generated in a short time. When the oil fume sensor detects the oil fume, the oil fume has already risen and spilled. Coupled with the start-up or speed regulation time of the motor, it results in a delay in extracting oil fume and it is difficult to achieve a satisfactory oil fume extraction effect. Summary of the Invention

[0005] Based on this, it is necessary to provide a control method for a range hood, a range hood, and an exhaust system for the above problems.

[0006] An embodiment of the present invention is implemented as follows. A control method for a range hood is applied to a range hood. The control method of the range hood includes:

[0007] Controlling an infrared camera to collect an image of the stove area below the range hood at a first frequency to obtain a first image;

[0008] Transmitting the collected first image to a mobile terminal communicating with the range hood;

[0009] Obtaining a first recognition result returned by the mobile terminal for the first image. If the first recognition result is a simmering state and / or a dry burning state, controlling the infrared camera to collect an image of the stove area below the range hood at a second frequency to obtain a second image and transmitting it to the mobile terminal, where the second frequency is greater than the first frequency;

[0010] Obtaining a second recognition result returned by the mobile terminal for the second image and the status information of the mobile terminal;

[0011] Judge whether the mobile terminal is in an idle state according to the status information. If so and the second recognition result is that there is an intervention operation, control the exhaust fan to operate at an overspeed for a set duration t.

[0012] In one embodiment, the present invention provides a control method for a range hood, which is applied to a mobile terminal. The control method for the range hood includes:

[0013] Obtain the first image as described in the present invention, identify and return the first recognition result;

[0014] Obtain the second image as described in the present invention, identify and return the second recognition result.

[0015] In one embodiment, the present invention provides a range hood, which includes:

[0016] A range hood body, the range hood body includes an air duct and an exhaust fan arranged in the air duct; and

[0017] A control module, the control module is wired to the exhaust fan and wirelessly connected to the mobile terminal, and is used to execute the control method for the range hood applied to the range hood as described in the embodiments of the present invention.

[0018] In one embodiment, the present invention provides an exhaust system, which includes:

[0019] The range hood as described in the present invention; and

[0020] A mobile terminal communicating with the range hood, the mobile terminal is used to execute the control method for the range hood applied to the mobile terminal as described in the present invention.

[0021] The control method for the range hood provided by the present invention uses a lower frequency to collect images of the stove area to obtain the first image, and identifies whether it is a simmering state or a dry burning state from the first image; if it is one of these two states, the acquisition frequency is increased to obtain the second image, and it is judged whether there are intervention operations such as lid lifting, food pouring, etc. by identifying the second image. If there are, the exhaust fan is made to operate at an overspeed for a short time to increase the air extraction volume, and a large amount of suddenly increased oil fumes are sucked in and discharged. The method provided by the present invention realizes the monitoring of sudden increase in oil fumes or steam. Before the oil fume detection device detects the oil fumes or steam, the rotation speed of the exhaust fan is increased in advance, realizing the automatic recognition and pre-treatment before the generation of oil fumes, and solving the problem that the suddenly increased oil fumes cannot be sucked in time. Brief Description of the Drawings

[0022] Figure 1 It is a flowchart of the control method for the range hood provided for one embodiment;

[0023] Figure 2It is a block diagram of the internal structure of a processing device in an embodiment. Detailed implementation manners

[0024] In order to make the objectives, technical solutions and advantages of the present invention clearer and more understandable, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0025] It can be understood that the terms "first", "second", etc. used in the present invention can be used herein to describe various elements, but unless otherwise specified, these elements are not limited by these terms. These terms are only used to distinguish a first element from another element. For example, without departing from the scope of the present invention, a first xx script can be called a second xx script, and similarly, a second xx script can be called a first xx script.

[0026] As Figure 1 shown, in an embodiment, a control method for an oil fume extractor is proposed. The control method for the oil fume extractor is applied to the oil fume extractor, and the control method for the oil fume extractor includes:

[0027] Controlling an infrared camera to collect an image of the stove area below the oil fume extractor at a first frequency to obtain a first image;

[0028] Transmitting the collected first image to a mobile terminal communicating with the oil fume extractor;

[0029] Obtaining a first recognition result returned by the mobile terminal for the first image. If the first recognition result is a stuffy steaming state and / or a dry burning state, controlling the infrared camera to collect an image of the stove area below the oil fume extractor at a second frequency to obtain a second image and transmitting it to the mobile terminal, where the second frequency is greater than the first frequency;

[0030] Obtaining a second recognition result returned by the mobile terminal for the second image and the status information of the mobile terminal;

[0031] Judging whether the mobile terminal is in an idle state according to the status information. If so and the second recognition result is that there is an intervention operation, controlling the exhaust fan to operate at an overspeed for a set duration t.

[0032] In this embodiment, by using the sensitivity of the infrared camera to temperature, the accuracy of image recognition can be improved. At the same time, the infrared light has good penetrability, and less oil fume, steam, etc. have little impact on it. In the embodiments of the present invention, it should be noted that the objects targeted by the present invention include both oil fume and steam, etc. There is no essential difference between the two in applying the method of the present invention. The embodiments of the present invention take the most severely affected oil fume as an example for description. In this embodiment, the infrared camera and the oil fume detection device are both existing components, and the installation and use of these components will not be elaborated in the present invention.

[0033] In this embodiment, an infrared camera is disposed at the inlet of the range hood duct to collect images of the stove area from top to bottom. The present invention will be described by taking the case of a single stove as an example. For double stoves or more stoves, multiple stoves can be placed in the same image for simultaneous processing, and each stove area can be separately identified, or each stove area can be separately subjected to image acquisition and identification. It can be understood that the stove area here refers to the area centered on the stove center captured by the infrared camera, and its size is preferably such that it includes the entire stove and part of the countertop, wherein the area ratio of the stove in the image is not less than 50%, preferably 80% - 90%.

[0034] In this embodiment, the first frequency is less than the second frequency. Considering that the time of simmering or dry burning is often long, the first frequency can be set to more than 10 seconds. Compared with the processing capacity of the mobile terminal, the data volume is extremely low, and the resource occupancy of the mobile terminal is very small. The second frequency can be set to 1 second, 2 seconds, etc. The first frequency and the second frequency differ by at least one order of magnitude. In this embodiment, the first image and the second image are only used to distinguish the images collected at different stages, and do not mean that there are essential differences between the images.

[0035] In this embodiment, the mobile terminal is preferably a smart phone. The present invention borrows the computing power of the mobile terminal to complete the calculation, reducing the hardware requirements for the range hood; in this embodiment, the range hood and the mobile terminal can be connected via Bluetooth, and data exchange can also be achieved by accessing the same wireless local area network, such as communicating via the wifi network provided by a router. In this embodiment, when identifying and judging the second image, it also includes judging the state of the mobile terminal. As an auxiliary judgment condition, it can be determined whether there is a user operating the kitchen utensils in the kitchen by judging whether the mobile terminal is in an idle state, thereby improving the accuracy of the exhaust fan control and reducing miscontrol.

[0036] In this embodiment, the over-speed operation of the exhaust fan can significantly increase the air extraction volume. Experiments show that the short-term over-speed operation of the motor does not cause statistically significant damage to the motor. However, the over-speed amplitude should be less than 30%, and the over-speed duration t should be less than 20 seconds. The realization of over-speed includes, but is not limited to, the adjustment of the motor input voltage or current, or the control of the frequency, etc. This is the existing technology for motor speed control. The difference of the present invention is only that the motor runs at a speed exceeding the rated speed for a short time.

[0037] In this embodiment, the simmering state refers to the process of continuously steaming the food in the pot using the pot lid, such as the process of making soup or steaming fish; while dry burning refers to the process of heating the pot without putting any food in it. In this case, the temperature of the pot is relatively high. If water, oil, etc. are suddenly put into the pot, a large amount of oil fumes and steam will be generated in a short time. In this embodiment, for the simmering state, the intervention operation refers to the operation of lifting the lid, and for the dry burning state, the intervention operation refers to any operation of adding food into the pot. In the image, both are manifested as the appearance of low-temperature objects such as hands, spatulas, or food in the image.

[0038] The control method of the range hood provided by the present invention is applied to a range hood. It collects the stove area at a relatively low frequency to obtain a first image, and identifies whether it is in a simmering state or a dry burning state from the first image. If it is in one of these two states, it increases the collection frequency to obtain a second image, and determines whether there are intervention operations such as lifting the lid or pouring food by identifying the second image. If there are, it makes the exhaust fan run at an ultra-high speed for a short time to increase the exhaust air volume, and inhales and discharges the suddenly increased large amount of oil fumes. The method provided by the present invention realizes the monitoring of the sudden increase in oil fumes or steam. Before the oil fume detection device detects the oil fumes or steam, it increases the speed of the exhaust fan in advance, realizes the automatic identification and pre-treatment before the generation of oil fumes, and solves the problem that the sudden increase in oil fumes cannot be sucked in time.

[0039] As an embodiment of the present invention, judging whether the mobile terminal is in an idle state according to the status information includes:

[0040] Judging whether the state of the mobile terminal is a locked screen state. If so, the mobile terminal is in an idle state;

[0041] If not, it is determined whether the mobile terminal is in an idle state according to the operation frequency, the interval between the last operation and the current time, and the type of the currently opened application in the status information.

[0042] In this embodiment, for the non-screen locked state, the corresponding frequency threshold and time interval threshold are determined by the type of the application. When the time interval since the previous operation reaches the time interval threshold corresponding to the current application, or the operation frequency in the most recent time period is lower than the frequency threshold corresponding to the current application, it is determined to be in an idle state. It should be noted that the length of the time period here should be greater than the above time interval threshold. In this embodiment, for each different application, the corresponding frequency threshold and time interval threshold can be obtained through data statistics of the current mobile terminal, or can be set by the user himself. In this embodiment, the types of applications include but are not limited to shopping categories (such as shopping platforms), social categories (such as social software), entertainment categories (such as music, games), information categories (such as browsers, e-readers, etc.). Of course, it is also possible to directly determine the corresponding frequency threshold and time interval threshold according to the specific application, which is an optional specific implementation method.

[0043] As an embodiment of the present invention, if the mobile terminal is in a non-idle state, the control method of the range hood further includes:

[0044] Search for paired mobile terminals within the communication range;

[0045] Access the mobile terminal with the strongest signal and obtain its status information. Determine whether the corresponding mobile terminal is in an idle state based on the obtained status information. If so, maintain the connection; otherwise, disconnect the connection;

[0046] Repeat the above step according to the signal strength from strong to weak until a connection is maintained with any idle mobile terminal or all paired mobile terminals are traversed;

[0047] After traversing all paired mobile terminals, poll all paired mobile terminals within the communication range at a set third frequency.

[0048] In this embodiment, the above communication process can be implemented at least in two ways: Bluetooth communication and Wi-Fi communication. In these communication methods, the communication range is affected by the signal strength. In a home scenario, it can almost cover the home range.

[0049] In this embodiment, preferentially connecting to mobile terminals in an idle state can reduce the burden on the mobile terminals. At the same time, the present invention preferentially connects to idle terminals, which can reduce misjudgment caused by the non-correspondence between the kitchen operator and the idle mobile terminal and reduce the limitation of the condition that the mobile terminal is in an idle state. In this embodiment, the third frequency here should be higher than the aforementioned first frequency and can be higher than the second frequency. The third frequency measures the number or quantity of mobile terminals polled per unit time.

[0050] As an embodiment of the present invention, after the control exhaust fan runs at an overspeed for a set duration t, it further includes:

[0051] Obtain the oil fume concentration before and during the overspeed operation through the oil fume detection device;

[0052] Judge whether the oil fume concentration during the overspeed operation increases. If so, collect a first image to determine whether to perform status monitoring;

[0053] If not, maintain the process of collecting, transmitting the second image, and obtaining the recognition result.

[0054] In this embodiment, if the oil fume concentration remains unchanged or changes less than the set range before and after overspeed operation, it is considered that the oil fume does not increase suddenly. At this time, the second image is collected at the second frequency. If it is detected that the oil fume content increases and the increase amplitude reaches the set range (such as 20%, 50%, 120%, etc.), it is considered that the sudden increase of oil fume has occurred. For the structure of a single stove, it can be considered that a control cycle is completed, and the image is collected again at the first frequency.

[0055] The present invention also provides a control method for an oil fume machine, which is applied to a mobile terminal. The control method of the oil fume machine includes:

[0056] Obtain the first image as described in the embodiment of the present invention, identify and return the first recognition result;

[0057] Obtain the second image as described in the embodiment of the present invention, identify and return the second recognition result.

[0058] In this embodiment, optionally, the status information of the mobile terminal can also be returned simultaneously when returning the second recognition result. In this embodiment, the first recognition result includes the simmering state and / or the dry burning state, or other states (non-simmering state and / or non-dry burning state); the second recognition result includes the existence of an intervention operation and the non-existence of an intervention operation.

[0059] As an embodiment of the present invention, the recognition of the first image includes the following steps:

[0060] Obtain at least one preset base point on the first image, and the preset base point is fixed relative to the overall position of the image;

[0061] Taking the preset base point as the center, make several rays at equal angles;

[0062] Taking the preset base point as the starting point, take points along the length direction on each ray, and obtain the gray values of the taken points. Among them, the distances between the points with the same ordinal number on different rays and the base point are equal;

[0063] Calculate the mean and variance of the gray values of the points with the same ordinal number on different rays;

[0064] Make an ordinal mean graph and judge whether the mean is a monotonic function of the ordinal number;

[0065] If so, judge whether the difference in variance between two adjacent ordinals is less than the first set threshold;

[0066] If so, obtain the detection value of the oil fume detection device, and judge whether the detection value is less than the second set threshold or greater than the third set threshold, where the second set threshold is less than the third set threshold;

[0067] If it is less than the second set threshold, it is judged as the dry burning state;

[0068] If it is greater than the third set threshold, it is determined to be in a steaming state.

[0069] In this embodiment, since the infrared acquisition device is fixedly arranged, its field of view is relatively fixed, so the center position of the stove in the acquired image is relatively fixed, preferably at the center position of the image. The base point in the present invention is the center point of the stove, and there can be multiple base points for multiple stoves.

[0070] In this embodiment, the number of rays can be 8, 10, 16, 20, etc. The more the number, the more accurate it is, but the higher the consumption of computing resources is, which can be set by the user; taking 20 as an example, the angle between two adjacent rays is 360° / 20=18°.

[0071] In this embodiment, the ordinal number here refers to the ordinal number of the point (pixel point) on the ray, such as the first point, the second point, etc. For different rays, the distance between the first point and the base point is equal to R1, the distance between the second point and the base point is equal to R2, and so on. In this embodiment, from the inside to the outside, points are only taken within a fixed length range of the ray, and points are not taken all the way to the edge of the image. This setting range is determined by the size of the diameter of a general pot lid in the image, and can also be input by the user.

[0072] In this embodiment, the calculation of the mean and the variance may refer to the prior art, and the embodiment of the present invention will not elaborate on this.

[0073] In this embodiment, the ordinal mean graph is a curve graph with the ordinal number of the point as the horizontal axis and the mean of the grayscale values ​​of all points (including all rays) corresponding to the ordinal number as the vertical axis. Since they are discrete points, these discrete points need to be connected by a smooth curve to obtain a continuous ordinal mean graph. The judgment of monotonicity can be achieved by referring to the prior art. The present invention utilizes the uniformity of the material and shape of the pot cover. When heated, the temperature distribution is distributed along the axial direction, which is converted into the monotonicity judgment of the ordinal mean. It is easy to implement and converts complex image recognition into the calculation and judgment of image information. In this embodiment, the first set threshold can be 10% or 20% of the smaller of the two adjacent variances. In this embodiment, the second set threshold and the third set threshold have a difference, and the accuracy of identifying the two states can be adjusted by adjusting the size of the difference. The second set threshold and the third set threshold can be set by the user through the mobile terminal, or divided by the historical record data of the oil smoke detection device. For example, there is a maximum value and a minimum value in the oil smoke record data, thereby determining a range. The second set threshold can be taken at 1 / 3 of the length of the range, and the third set threshold can be taken at 2 / 3 of the length of the range. This takes advantage of the fact that steaming has oil smoke / steam, while dry burning usually has no oil smoke / steam.

[0074] As an embodiment of the present invention, taking points on each ray along the length direction includes the following steps:

[0075] Calculating the difference between the average gray values of the points corresponding to the previous and next ordinals;

[0076] Setting the step distance of the next ordinal proportionally according to the difference between the averages corresponding to the previous and next ordinals.

[0077] In this embodiment, for example, the initial step distance is L1, and the difference between the average gray values of the point with ordinal 1 and the point with ordinal 2 is A1. Then, the difference A2 between the average gray values of the points between ordinal 2 and ordinal 3 and the step distance L2 satisfy A1 / A2 = L1 / L2, where the absolute value of the difference between the average values is taken. The present invention controls the step distance through the difference between the average gray values of pixel points, which can control the density of the collected points and reduce interference factors.

[0078] As an embodiment of the present invention, the recognition of the second image includes the following steps:

[0079] Obtaining the gray values of all points of the first image and the second image;

[0080] Subtracting the gray values of the corresponding points of the two images to obtain a difference image;

[0081] Identifying the contour of the difference region in the difference image through high-contrast retention;

[0082] Judging whether the recognized contour is single and extends beyond the second image. If so, it is judged that there is an intervention operation; otherwise, there is no intervention operation.

[0083] In this embodiment, high-contrast retention is a processing method of calculating the gray values between adjacent pixels. If the difference between the gray values of adjacent pixels reaches a set value, these two pixels are retained, and the remaining pixels are set to white. The set value of the gray difference here can be taken as 100 - 150. Through this processing, the contour of the different parts of the two images can be recognized. When the contour is single and connected to enclose a region, and this region extends beyond the image, it is judged that there is an intervention operation. This utilizes the similarity between the first image and the second image, and at the same time utilizes the characteristic that kitchen utensils such as hands, spatulas, and spoons generally have a lower temperature than the pot when performing intervention operations.

[0084] The embodiment of the present invention also provides an oil fume machine, and the oil fume machine includes:

[0085] An oil fume machine body, the oil fume machine body includes an air duct and an exhaust fan arranged in the air duct; and

[0086] A control module, which is wired to the exhaust fan and wirelessly connected to the mobile terminal, is used to execute the control method of the range hood applied to the range hood as described in the present invention.

[0087] In this embodiment, the present invention does not specifically limit the structure of the range hood, which can be implemented with reference to the prior art. The control module includes a communication unit and a data processing unit. The communication unit can be a Bluetooth module or a Wi-Fi module, and the data processing unit can use an existing processing chip, which will not be elaborated herein.

[0088] The range hood provided by the present invention uses a lower frequency to collect the stove area to obtain a first image, and identifies whether it is in a simmering state or a dry-burning state from the first image; if it is in these two states, the collection frequency is increased to obtain a second image, and it is determined whether there are intervention operations such as lid opening and food pouring by identifying the second image. If so, the exhaust fan is made to operate at an overspeed for a short time to increase the exhaust air volume, and a large amount of suddenly increased oil fumes are sucked in and discharged. The method provided by the present invention realizes the monitoring of sudden increase in oil fumes or steam. Before the oil fume detection device detects the oil fumes or steam, the rotation speed of the exhaust fan is increased in advance, realizing the automatic identification and preprocessing before the generation of oil fumes, and solving the problem that the sudden increase in oil fumes cannot be sucked in time.

[0089] The embodiment of the present invention also provides an exhaust system, which includes:

[0090] The range hood as described in the present invention; and

[0091] A mobile terminal communicating with the range hood, and the mobile terminal is used to execute the control method of the range hood applied to the mobile terminal as described in the embodiment of the present invention.

[0092] In this embodiment, for the description of the range hood, please refer to the previous embodiment; the mobile terminal can be a smart phone.

[0093] The exhaust system provided by the present invention, through the cooperation of the range hood and the mobile terminal, uses a lower frequency to collect the stove area to obtain a first image, and identifies whether it is in a simmering state or a dry-burning state from the first image; if it is in these two states, the collection frequency is increased to obtain a second image, and it is determined whether there are intervention operations such as lid opening and food pouring by identifying the second image. If so, the exhaust fan is made to operate at an overspeed for a short time to increase the exhaust air volume, and a large amount of suddenly increased oil fumes are sucked in and discharged. The method provided by the present invention realizes the monitoring of sudden increase in oil fumes or steam. Before the oil fume detection device detects the oil fumes or steam, the rotation speed of the exhaust fan is increased in advance, realizing the automatic identification and preprocessing before the generation of oil fumes, and solving the problem that the sudden increase in oil fumes cannot be sucked in time.

[0094] Figure 2The internal structure diagram of a processing device in an embodiment is shown. The processing device may specifically be the control module in the range hood of the present invention or the processing module of a mobile terminal. As shown in the figure, the processing device includes a processor, a memory, and a network interface connected through a system bus. Among them, the memory includes a non-volatile storage medium and an internal memory. The non-volatile storage medium of the processing device stores an operating system and may also store a computer program. When the computer program is executed by the processor, the processor can implement the control method of the range hood provided by the embodiments of the present invention. The internal memory may also store a computer program. When the computer program is executed by the processor, the processor can execute the control method of the range hood provided by the embodiments of the present invention.

[0095] Those skilled in the art can understand that Figure 2 the structure shown in is only a block diagram of some structures related to the solution of the present invention, and does not constitute a limitation on the processing device to which the solution of the present invention is applied. The specific processing device may include more or fewer components than those shown in the figure, or combine some components, or have a different component layout.

[0096] In one embodiment, a processing device is proposed. The processing device includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the following steps are implemented:

[0097] Control the infrared camera to collect an image of the stove area below the range hood at a first frequency to obtain a first image;

[0098] Transmit the collected first image to a mobile terminal communicating with the range hood;

[0099] Obtain a first recognition result returned by the mobile terminal for the first image. If the first recognition result is the stuffy steaming state and / or the dry burning state, control the infrared camera to collect an image of the stove area below the range hood at a second frequency to obtain a second image and transmit it to the mobile terminal, where the second frequency is greater than the first frequency;

[0100] Obtain a second recognition result returned by the mobile terminal for the second image and the status information of the mobile terminal;

[0101] Judge whether the mobile terminal is in an idle state according to the status information. If so and the second recognition result is that there is an intervention operation, control the exhaust fan to operate at an overspeed for a set duration t.

[0102] Or:

[0103] Obtain the first image as described in the present invention, identify and return the first recognition result;

[0104] Obtain the second image as described in the present invention, identify and return the second recognition result.

[0105] In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored. When the computer program is executed by a processor, the processor is caused to perform the following steps:

[0106] Control the infrared camera to collect an image of the stove area under the range hood at a first frequency to obtain a first image;

[0107] Transmit the collected first image to a mobile terminal communicating with the range hood;

[0108] Obtain the first recognition result returned by the mobile terminal for the first image. If the first recognition result is the stuffy steaming state and / or the dry burning state, control the infrared camera to collect an image of the stove area under the range hood at a second frequency to obtain a second image and transmit it to the mobile terminal, where the second frequency is greater than the first frequency;

[0109] Obtain the second recognition result returned by the mobile terminal for the second image and the status information of the mobile terminal;

[0110] Judge whether the mobile terminal is in an idle state according to the status information. If so and the second recognition result is that there is an intervention operation, control the exhaust fan to operate at an overspeed for a set duration t.

[0111] Or:

[0112] Obtain the first image as described in the present invention, identify and return the first recognition result;

[0113] Obtain the second image as described in the present invention, identify and return the second recognition result.

[0114] It should be understood that although the steps in the flowcharts of the embodiments of the present invention are shown in sequence according to the arrows, these steps do not necessarily have to be executed in the order indicated by the arrows. Unless otherwise clearly stated in this article, there is no strict order limit for the execution of these steps, and these steps can be executed in other orders. Moreover, at least a part of the steps in each embodiment may include multiple sub-steps or multiple stages. These sub-steps or stages do not necessarily have to be executed at the same moment, but can be executed at different moments. The execution order of these sub-steps or stages does not necessarily have to be sequential, but can be executed alternately or alternately with at least a part of other steps or sub-steps or stages of other steps.

[0115] Those of ordinary skill in the art can understand that all or part of the processes in the methods of the above embodiments can be completed by instructing relevant hardware through a computer program. The program can be stored in a non-volatile computer-readable storage medium. When the program is executed, it can include the processes of the embodiments of the above methods. Among them, any reference to a memory, storage, database, or other medium used in the embodiments provided by the present invention can include non-volatile and / or volatile memories. Non-volatile memories can include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories can include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in many forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), double data rate SDRAM (DDR SDRAM), enhanced SDRAM (ESDRAM), synchronous link DRAM (SLDRAM), Rambus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and Rambus dynamic RAM (RDRAM), etc.

[0116] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0117] The above embodiments only represent several implementation manners of the present invention. The description is relatively specific and detailed, but it should not be construed as a limitation on the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several modifications and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be subject to the appended claims.

Claims

1. A control method for a range hood, characterized in that, Applied to a range hood, the control method of the range hood includes: Controlling an infrared camera to collect an image of the stove area below the range hood at a first frequency to obtain a first image; Transmitting the collected first image to a mobile terminal communicating with the range hood; Obtaining a first recognition result returned by the mobile terminal for the first image. If the first recognition result is a simmering state and / or a dry burning state, controlling the infrared camera to collect an image of the stove area below the range hood at a second frequency to obtain a second image and transmitting it to the mobile terminal, where the second frequency is greater than the first frequency; Obtaining a second recognition result returned by the mobile terminal for the second image and the status information of the mobile terminal; Judging whether the mobile terminal is in an idle state according to the status information. If so and the second recognition result is that there is an intervention operation, controlling the exhaust fan to operate at an overspeed for a set duration t.

2. The control method for a range hood according to claim 1, characterized in that, Judging whether the mobile terminal is in an idle state according to the status information includes: Judging whether the status of the mobile terminal is a locked screen state. If so, the mobile terminal is in an idle state; If not, determining whether the mobile terminal is in an idle state according to the operation frequency, the interval from the last operation to the current time, and the type of the currently opened application in the status information.

3. The control method for a range hood according to claim 2, characterized in that, If the mobile terminal is in a non-idle state, the control method of the range hood further includes: Searching for paired mobile terminals within the communication range; Connecting to the mobile terminal with the strongest signal and obtaining its status information, and judging whether the corresponding mobile terminal is in an idle state according to the obtained status information. If so, maintaining the connection, otherwise disconnecting the connection; Repeating the above step according to the signal strength from strong to weak until connecting to any idle mobile terminal or traversing all paired mobile terminals; After traversing all paired mobile terminals, polling all paired mobile terminals within the communication range at a set third frequency.

4. The control method for a range hood according to claim 1, characterized in that, After controlling the exhaust fan to operate at an overspeed for a set duration t, it further includes: Obtaining the oil fume concentration before and during the overspeed operation through an oil fume detection device; Judging whether the oil fume concentration during the overspeed operation rises. If so, collecting the first image to determine whether to perform status monitoring; If not, maintaining the process of collecting, transmitting the second image and obtaining the recognition result.

5. A range hood, characterized in that, The range hood includes: A range hood body, the range hood body includes an air duct and an exhaust fan arranged in the air duct; and A control module, the control module is wired to the exhaust fan and wirelessly connected to the mobile terminal, and is used to execute the control method of the range hood according to any one of claims 1-4.

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