A range hood and control method

Abstract

The application provides an oil fume extractor and a control method, relates to the technical field of oil fume extractors, and is used for ensuring the accuracy of oil fume concentration detection under the condition that an oil fume sensor is dirty and blocked. The oil fume extractor comprises: a machine body, the machine body is provided with an air inlet and an air outlet, and an air duct is formed between the air inlet and the air outlet; a fan assembly, the fan assembly is arranged in the air duct, and air flow introduced from the air inlet is discharged from the air outlet through the fan assembly; an oil fume sensor, the oil fume sensor is arranged at the air inlet and is used for detecting the oil fume concentration value of the air inlet; and a controller, which is configured to: in the state that the oil fume extractor is powered on but not started, acquire the first oil fume concentration value of the air inlet in a first time period through the oil fume sensor; predict the oil fume concentration threshold value according to the first oil fume concentration value; acquire the second oil fume concentration value of the air inlet in the state that the oil fume extractor is started; and control the fan assembly to start working when it is detected that the second oil fume concentration value is above the oil fume concentration threshold value.

Description

Technical Field

[0001] This application relates to the field of range hood technology, and in particular to a range hood and its control method. Background Technology

[0002] During kitchen use, a large amount of oily fumes are often generated, making the kitchen environment greasy and difficult to clean. These fumes also contain many substances harmful to the human body. Prolonged exposure to fumes can lead to various illnesses. Therefore, range hoods were developed. Today, consumers increasingly pursue a higher quality of life and have higher demands for the user experience of home range hoods, especially regarding the interactive features. More convenient and intelligent operation methods have become a major focus of industry research and development. Automatic fan speed adjustment based on the amount of oily fumes, eliminating the need for manual fan speed control, has become the industry's preferred solution.

[0003] However, during prolonged use of a range hood, oil fume sensors accumulate oil fume particles over time, causing a decrease in sensor sensitivity or even rendering them ineffective. This affects the accuracy of the range hood's oil fume concentration detection, leading to a malfunction of the range hood. Summary of the Invention

[0004] This application provides a range hood and control method to ensure the accuracy of oil fume concentration detection when the smoke sensor is clogged.

[0005] To achieve the above objectives, this application adopts the following technical solution:

[0006] In a first aspect, a range hood is provided, the range hood comprising:

[0007] The body is equipped with an air intake and an exhaust port, and an air duct is formed between the air intake and the exhaust port.

[0008] The fan assembly is installed inside the air duct. The airflow introduced from the air intake through the fan assembly passes through the air duct and is discharged from the air exhaust port.

[0009] A fume sensor, located at the air intake, is used to detect the concentration of oil fumes at the intake; and,

[0010] The controller is configured as follows:

[0011] When the range hood is powered on but not started, the oil fume concentration value at the air intake is obtained through the oil fume sensor during the first time period.

[0012] Based on the first oil fume concentration value, the oil fume concentration threshold is predicted;

[0013] When the range hood is in the activated state, obtain the second oil fume concentration value at the air intake;

[0014] When the second oil fume concentration value is detected to be above the oil fume concentration threshold, the control fan assembly starts to work.

[0015] The technical solution provided in this application provides at least the following beneficial effects: When the range hood is powered on but not started, it can be understood that no oil fumes are generated in the environment where the range hood is located. The first oil fume concentration value at the air intake obtained by the oil fume sensor within a first time period can be understood as the no-oil-fume concentration value. The oil fume concentration threshold under oil fume generation conditions in the environment where the range hood is located can be predicted based on the no-oil-fume concentration value. It is understood that under different conditions of oil fume concentration sensor blockage, the no-oil-fume concentration value detected in a smokeless environment and the oil fume concentration value detected in a smoky environment should have a certain relationship. Therefore, the oil fume concentration threshold under oil fume generation conditions can be predicted based on the first oil fume concentration value at the air intake within a first time period when the range hood is powered on but not started. Then, the second oil fume concentration value at the air intake when the range hood is started is compared with the oil fume concentration threshold. When the second oil fume concentration value is detected to be above the oil fume concentration threshold, it is determined that oil fumes are generated in the environment where the range hood is located, and then the fan assembly is controlled to start working.

[0016] In this way, the oil fume concentration threshold under oil fume conditions is predicted based on the oil fume concentration value under no oil fume conditions. This reduces the impact of the oil fume sensor being in different dirt and blockage conditions on the accuracy of oil fume concentration detection, and ensures the accuracy of the oil fume sensor in detecting oil fume concentration under different dirt and blockage conditions. This allows for timely control of the fan component to start working when oil fume is detected, improving the accuracy of determining the timing of fan component start-up and helping to improve the user experience.

[0017] In some embodiments, the controller is further configured to: acquire a third oil fume concentration value at the air intake after the control fan assembly starts working; and control the fan assembly to stop working when the third oil fume concentration value is detected to be below the oil fume concentration threshold.

[0018] In some embodiments, the controller is further configured to: record the cumulative running time of the fan assembly after the fan assembly starts working; after detecting that the cumulative running time of the fan assembly has reached a preset duration, obtain a fourth oil fume concentration value of the air intake in a second time period while the range hood is powered on but not started; and redetermine the oil fume concentration threshold based on the fourth oil fume concentration value.

[0019] In some embodiments, the range hood further includes: a display device for displaying the working status of the range hood; a voice prompt device for playing prompt information; and a controller configured to, after redetermining the fume concentration threshold based on the fourth fume concentration value, further configured to: if the difference between the fume concentration threshold before redetermining and the fume concentration threshold after redetermining is greater than a preset difference, control the display device and / or the voice prompt device to issue a cleaning prompt information, the cleaning prompt information being used to prompt the fume sensor to be cleaned.

[0020] In some embodiments, when the controller is configured to obtain the first oil fume concentration value of the air intake in a first time period through the oil fume sensor, the following steps are specifically performed: obtaining the oil fume concentration value of the air intake at each of N times in the first time period, where N is an integer greater than 1; and taking the average value of the oil fume concentration values ​​at the N times as the first oil fume concentration value of the air intake in the first time period.

[0021] Secondly, this application provides a control method for a range hood, the method comprising: when the range hood is powered on but not started, acquiring a first oil fume concentration value at the air intake within a first time period; predicting an oil fume concentration threshold based on the first oil fume concentration value; when the range hood is started, acquiring a second oil fume concentration value at the air intake; and when the second oil fume concentration value is detected to be above the oil fume concentration threshold, controlling the fan assembly to start working.

[0022] In some embodiments, after the fan assembly starts working, the method further includes: acquiring a third oil fume concentration value at the air intake; and controlling the fan assembly to stop working when the third oil fume concentration value is detected to be below an oil fume concentration threshold.

[0023] In some embodiments, after the control fan assembly starts working, the method further includes: recording the cumulative running time of the fan assembly; after detecting that the cumulative running time of the fan assembly has reached a preset time, obtaining a fourth oil fume concentration value at the air intake in a second time period while the range hood is powered on but not started; and redetermining the oil fume concentration threshold based on the fourth oil fume concentration value.

[0024] In some embodiments, after redetermining the fume concentration threshold based on the fourth fume concentration value, the method further includes: if the difference between the fume concentration threshold before redetermining and the fume concentration threshold after redetermining is greater than a preset difference, then controlling the display device and / or the voice prompt device to issue a cleaning prompt message, the cleaning prompt message being used to prompt the fume sensor to be cleaned.

[0025] In some embodiments, obtaining the first oil fume concentration value of the air intake in a first time period includes: obtaining the oil fume concentration value of the air intake at each of N times in the first time period, where N is an integer greater than 1; and taking the average of the oil fume concentration values ​​at the N times as the first oil fume concentration value of the air intake in the first time period.

[0026] Thirdly, a controller is provided, comprising: one or more processors; one or more memories; wherein the one or more memories are used to store computer program code, the computer program code including computer instructions, and when the one or more processors execute the computer instructions, the controller executes any of the control methods for a range hood provided in the second aspect.

[0027] Fourthly, a computer-readable storage medium is provided, the computer-readable storage medium including computer instructions, which, when controlled on a computer, cause the computer to execute any of the control methods for a range hood provided in the second aspect.

[0028] Fifthly, a computer program product is provided, which can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can realize the control method of the range hood provided in any of the second aspects.

[0029] It should be noted that the aforementioned computer instructions may be stored, in whole or in part, on a computer-readable storage medium. This computer-readable storage medium may be packaged together with the controller's processor, or it may be packaged separately from the controller's processor; this application does not impose any limitations on this.

[0030] The beneficial effects described in aspects two through five of this application can be referred to the analysis of the beneficial effects of aspect one, and will not be repeated here. Attached Figure Description

[0031] The accompanying drawings are used to provide a further understanding of the technical solutions of this application and constitute a part of the specification. They are used together with the embodiments of this application to explain the technical solutions of this application and do not constitute a limitation on the technical solutions of this application.

[0032] Figure 1 This is a schematic diagram illustrating a usage scenario of a range hood provided in an embodiment of this application;

[0033] Figure 2 This is a schematic diagram of the structure of a range hood provided in an embodiment of this application;

[0034] Figure 3 A hardware configuration block diagram of a range hood provided in an embodiment of this application;

[0035] Figure 4This is a schematic flowchart of a control method for a range hood provided in an embodiment of this application;

[0036] Figure 5 A flowchart illustrating another control method for a range hood provided in an embodiment of this application;

[0037] Figure 6 A flowchart illustrating another control method for a range hood provided in an embodiment of this application;

[0038] Figure 7 A flowchart illustrating another control method for a range hood provided in an embodiment of this application;

[0039] Figure 8 A flowchart illustrating another control method for a range hood provided in an embodiment of this application;

[0040] Figure 9 This is a schematic diagram of the overall process of a control method for a range hood provided in an embodiment of this application;

[0041] Figure 10 This is a schematic diagram of the hardware structure of the controller provided in an embodiment of this application. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0045] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "connected" and "linked" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances. Furthermore, when describing pipelines, the terms "connected" and "linked" as used in this application have the meaning of establishing electrical connection. The specific meaning needs to be understood in conjunction with the context.

[0046] In the embodiments of this application, the terms "exemplary" or "for example" are used to indicate that something is an example, illustration, or description. Any embodiment or design that is described as "exemplary" or "for example" in the embodiments of this application should not be construed as being more preferred or advantageous than other embodiments or design. Specifically, the use of the terms "exemplary" or "for example" is intended to present the relevant concepts in a specific manner.

[0047] Steaming, boiling, frying, and stir-frying constitute a large proportion of cooking techniques, resulting in significant amounts of oil fumes in the kitchen, making the environment greasy and difficult to clean. Therefore, range hoods were developed. When the fan inside a range hood operates, it creates negative pressure, drawing most of the oil fumes generated during cooking into the hood, improving the kitchen environment. Today, consumers pursue a higher quality of life and have higher demands for the user experience of home range hoods. Automatic fan speed adjustment based on the amount of oil fumes, eliminating the need for manual operation, has become the industry's preferred design.

[0048] However, during prolonged use of a range hood, oil fume particles will adhere to the oil fume sensor, causing a decrease in the sensor's sensitivity or even rendering it ineffective. This results in the oil fume sensor becoming unusable and shortening its lifespan.

[0049] Based on this, this application provides a range hood and control method. When the range hood is powered on but not started, it can be understood that no oil fumes are generated in the environment where the range hood is located. The first oil fume concentration value at the air intake obtained by the oil fume sensor within a first time period can be understood as the no-oil-fume concentration value. The oil fume concentration threshold under oil fume generation conditions in the environment where the range hood is located is predicted based on the no-oil-fume concentration value. It is understood that, under different conditions of oil fume concentration sensor blockage, the no-oil-fume concentration value detected in a smoke-free environment and the oil fume concentration value detected in a smoky environment should have a certain relationship. Therefore, the oil fume concentration threshold under oil fume generation conditions can be predicted based on the first oil fume concentration value at the air intake within a first time period when the range hood is powered on but not started. Then, the second oil fume concentration value at the air intake when the range hood is started is compared with the oil fume concentration threshold. When the second oil fume concentration value is detected to be above the oil fume concentration threshold, it is determined that oil fumes are generated in the environment where the range hood is located, and the fan assembly is then controlled to start working.

[0050] In this way, the oil fume concentration threshold under oil fume conditions is predicted based on the oil fume concentration value under no oil fume conditions. This reduces the impact of the oil fume sensor being in different dirt and blockage conditions on the accuracy of oil fume concentration detection, and ensures the accuracy of the oil fume sensor in detecting oil fume concentration under different dirt and blockage conditions. This allows for timely control of the fan component to start working when oil fume is detected, improving the accuracy of determining the timing of fan component start-up and helping to improve the user experience.

[0051] Figure 1 This is a schematic diagram illustrating a usage scenario of a range hood provided in an embodiment of this application. Figure 1 As shown, this usage scenario includes a range hood 10 and a cooktop 20.

[0052] In some embodiments, the cooktop 20 is used to heat cookware. The cooktop 20 may be a smart cooktop, a gas cooktop, or an induction cooktop, etc.

[0053] In some embodiments, the range hood 10 is positioned above the cooktop 20 to absorb the fumes generated when the cooktop 20 is in operation.

[0054] In some embodiments, the range hood 10 may be a variable frequency range hood.

[0055] In some embodiments, the range hood 10 includes a side-draft range hood and a front-draft range hood.

[0056] Figure 2 This is a schematic diagram of the structure of a range hood provided in an embodiment of this application. Figure 2As shown, the range hood 10 includes: a body 101, a filter screen 102, an oil storage tank 103, an air intake 104, an exhaust port 105, and a display device 106.

[0057] In some embodiments, the body 101 protects the internal electrical components of the range hood and seals the channels between the inside and outside of the range hood to prevent damage to the electrical components.

[0058] In some embodiments, the filter 102 is used to separate the oil fumes passing through the air intake 104, preventing oil stains from entering the range hood and affecting the safety and service life of the internal components of the range hood.

[0059] In some embodiments, an oil storage tank 103 is disposed below a filter screen 102 for receiving grease filtered out from the filter screen 102.

[0060] In some embodiments, the air intake 104 is disposed inside the body 101 for drawing in oil fumes and reducing the concentration of oil fumes in the environment where the range hood is located.

[0061] In some embodiments, an exhaust port 105 is disposed inside the body 101 to discharge inhaled fumes, and an air duct is formed between the exhaust port 105 and the air intake port 104.

[0062] In some embodiments, the display device 106 may be a liquid crystal display (LCD) or an organic light-emitting diode (OLED) display. The specific type, size, and resolution of the display device 106 are not limited. The display device 106 can be used to display the control panel of the range hood. The range hood can use the display device to provide feedback on its current operating status, such as the current operating level of the fan and the oil fume concentration value measured by the oil fume sensor.

[0063] Figure 3 This is a hardware configuration block diagram of a range hood provided in an embodiment of this application. The range hood 10 may further include: a fan assembly 107, a fume sensor 108, a memory 109, a communicator 110, a voice prompt device 111, a power supply 112, and a controller 50.

[0064] The display device 106, the fan assembly 107, the oil fume sensor 108, the memory 109, the communicator 110, the voice prompt device 111, and the power supply 112 are all connected to the controller 50.

[0065] In some embodiments, the fan assembly 107 is disposed in the air duct formed by the air intake 104 and the exhaust port 105, and is used to discharge the airflow introduced from the air intake through the air duct and out of the exhaust port.

[0066] In some embodiments, the fan assembly 107 includes: a motor 1071, a fan wheel 1072, a guide ring 1073, and a volute 1074.

[0067] In some embodiments, the motor 1071 is disposed inside the volute 1074 and connected to the impeller 1072 to drive the impeller to rotate, providing power support for the range hood to draw in cooking fumes.

[0068] In some embodiments, the impeller 1072 is disposed inside the volute 1074 and can be driven to rotate by the motor 1071 to generate a negative pressure zone within a certain range by high-speed rotation, so that the indoor oil fume gas can be drawn into the range hood.

[0069] In some embodiments, the air guide ring 1073 is connected to the volute 1074 and surrounds the air inlet of the volute 1074 to guide the inhaled fumes through the volute 1074 and reduce the noise generated during the operation of the range hood.

[0070] In some embodiments, the volute 1074 has an air inlet and an air outlet. The air inlet is connected to the intake port 104, and the air outlet is connected to the exhaust port 105, which is used to guide the oil fume airflow into the exhaust port 105 so as to discharge the oil fume outdoors.

[0071] For example, when the motor 1071 starts rotating, it drives the impeller 1072 to rotate, creating a negative pressure zone. The fumes located in this negative pressure zone are drawn into the range hood's intake 104, then guided through the air inlet of the guide ring 1073 and the volute 1074, and finally flow into the exhaust 105, thus expelling the fumes outdoors. In this way, the fumes generated by the stove during cooking can be absorbed by the range hood and discharged outdoors.

[0072] In some embodiments, the fume sensor 108 is disposed at the air intake 104 to detect the fume concentration value at the air intake 104 and send the detected fume concentration value to the controller 50.

[0073] In some embodiments, the fume sensor may be a laser particulate sensor. Based on the principle of laser scattering, particles of different diameters are statistically analyzed, and particles with a resolution greater than or equal to 0.3 μm are collected to obtain the particulate concentration value, which is the fume concentration value.

[0074] In some embodiments, memory 109 may be used to store software programs and data. Controller 50 executes various functions of the range hood 10 and performs data processing by running the software programs or data stored in memory 109. Memory 109 may include high-speed random access memory and may also include non-volatile memory, such as at least one disk storage device, flash memory device, or other volatile solid-state storage device. Memory 109 stores an operating system that enables the range hood 10 to operate. In this application, memory 109 may store the operating system and various applications.

[0075] In some embodiments, the communicator 110 is a component for communicating with external devices or external servers according to various communication protocol types. For example, the communicator may include at least one of a Wi-Fi chip, a Bluetooth communication protocol chip, a wired Ethernet communication protocol chip, or other network communication protocol chips or near-field communication protocol chips, as well as an infrared receiver.

[0076] In some embodiments, the voice prompt device 111 is used to play prompt information. The voice prompt device 111 may include a speaker and a microphone to enable voice interaction between the user and the range hood. For example, it can be used to control the range hood to start or stop working via voice.

[0077] In some embodiments, the power supply 112 is used to provide operating power support to the various electrical components of the range hood 10 under the control of the controller. The power supply 112 may include a battery and related control circuitry.

[0078] In some embodiments, controller 50 refers to a device that can generate operation control signals based on instruction opcodes and timing signals to instruct the range hood 10 to execute control instructions. Exemplarily, controller 50 can be a central processing unit (CPU), a network processor (NP), a digital signal processor (DSP), a programmable logic device (PLD), a microprocessor, a microcontroller, or any combination thereof. The controller can also be other devices with processing functions, such as circuits, devices, or software modules; this application embodiment does not impose any limitations on this.

[0079] Those skilled in the art will understand that Figure 2 and Figure 3 The hardware structure shown does not constitute a limitation on the range hood. The range hood may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0080] The specific solution of this application will be described in detail below with reference to the accompanying drawings.

[0081] This application provides a control method for a range hood, such as... Figure 4 As shown, this method is applied to a controller, which can be one of the controllers described above. Figure 3 The controller 50 in the range hood shown includes the following steps:

[0082] S101. When the range hood is powered on but not started, obtain the first oil fume concentration value at the air intake during the first time period.

[0083] In some embodiments, when the range hood is powered on but not activated, it can be understood that the user is not currently cooking on the stove, or the user is currently washing food and has not turned on the range hood to extract fumes; that is, no fumes are currently being generated in the environment where the range hood is located. In this case, the controller obtains a first fume concentration value at the air intake within a first time period through a fume concentration sensor. The first fume concentration value can be understood as the fume-free concentration value in the environment where the range hood is located.

[0084] Optional, such as Figure 5 As shown, step S101 above can be specifically implemented as follows:

[0085] S1011. Obtain the oil fume concentration value at each of the N times within the first time period.

[0086] In some embodiments, to predict the oil fume concentration threshold, the controller can periodically acquire the oil fume concentration value at each of N moments within a first time period using an oil fume concentration sensor. Here, N is an integer greater than 1. The first time period can be preset at the factory of the range hood; for example, if the first time period is 60 seconds (s), the controller acquires the oil fume concentration value at the air intake every second within those 60 seconds.

[0087] S1012. Take the average value of the oil fume concentration at N times as the first oil fume concentration value at the air intake in the first time period.

[0088] In some embodiments, after obtaining the oil fume concentration value at each of the N times within the first time period, the average value of the oil fume concentration values ​​at the N times can be calculated, and then the average value of the oil fume concentration values ​​at the N times can be used as the first oil fume concentration value of the air intake within the first time period.

[0089] Understandably, using the average value of the oil fume concentration at N times as the first oil fume concentration value at the air intake in the first time period can reduce the influence of random factors on the first oil fume concentration value during the process of the controller acquiring the oil fume concentration values ​​at N times, and improve the rationality of the first oil fume concentration value acquired by the controller.

[0090] In some embodiments, before calculating the average value of the oil fume concentration values ​​at N times, the oil fume concentration values ​​at N times can be filtered to remove abnormal oil fume concentration values, thereby reducing the impact of abnormal oil fume concentration values ​​on the first oil fume concentration value.

[0091] Specifically, the oil fume concentration values ​​at N time points can be compared with a preset oil fume concentration range, and oil fume concentration values ​​that are not within the preset range can be considered abnormal oil fume concentration values. The preset oil fume concentration range can be pre-set at the factory when the range hood leaves the factory.

[0092] S102. Based on the first oil fume concentration value, the oil fume concentration threshold is predicted.

[0093] As can be seen from the above description of the first oil fume concentration value, the first oil fume concentration value can be understood as the oil fume concentration value obtained by the controller when the environment where the range hood is located does not produce oil fumes.

[0094] In some embodiments, the oil fume concentration threshold when the range hood produces oil fumes can be predicted based on the oil fume concentration value when the environment where the range hood is located does not produce oil fumes.

[0095] Specifically, the oil fume concentration threshold can be predicted based on the first oil fume concentration value and the oil fume concentration threshold prediction model.

[0096] In some embodiments, the range hood's memory stores a pre-trained oil fume concentration threshold prediction model. After obtaining a first oil fume concentration value, the controller can input the first oil fume concentration value into the pre-stored pre-trained oil fume concentration threshold prediction model to obtain a predicted value of the oil fume concentration threshold, and then use the predicted value of the oil fume concentration threshold as the oil fume concentration threshold of the range hood.

[0097] Optionally, the fume concentration threshold prediction model can be implemented using various algorithms. For example, traditional machine learning-based fume concentration threshold prediction models can be obtained using algorithms such as Support Vector Machine (SVM), Gradient Boosting Decision Tree (GBDT), and Random Forest (RF). Alternatively, deep learning-based fume concentration threshold prediction models can be obtained using algorithms such as Convolutional Neural Networks (CNN), Recurrent Neural Networks (RNN), and Long Short-Term Memory (LSTM). This application does not limit the specific implementation of these models.

[0098] S103. When the range hood is in the start-up state, obtain the second oil fume concentration value at the air intake.

[0099] In some embodiments, when a user is ready to use the stove for cooking, the user controls the range hood to start.

[0100] Optionally, users can control the range hood to start via touch operation on the control panel. Upon receiving the user's touch operation, the controller activates the various components of the range hood. For example, the controller puts the fan assembly into standby mode and controls the fume sensor to acquire the second fume concentration value at the air intake in real time.

[0101] Understandably, even when the range hood is on, the environment around it may not be producing any cooking fumes. For example, when a user is heating a pan on the stove or preparing food, the user may activate the range hood, but the environment around it may still not be producing any cooking fumes. Therefore, after the range hood is activated, the controller controls the fume sensor to continuously monitor the second fume concentration value at the air intake. This allows the controller to promptly activate the fan assembly when the second fume concentration value exceeds the fume concentration threshold.

[0102] S104. When the second oil fume concentration value is detected to be above the oil fume concentration threshold, the control fan assembly starts to work.

[0103] Understandably, when the second oil fume concentration value is detected to be above the oil fume concentration threshold, it is determined that oil fumes have been generated in the environment where the range hood is located. At this time, the controller can control the fan component to start working to adsorb the oil fumes generated in the environment where the range hood is located, so as to remove the oil fumes generated in the environment where the range hood is located and ensure the user's cooking experience.

[0104] based on Figure 4 The illustrated embodiment offers at least the following advantages: When the range hood is powered on but not activated, it can be understood that no oil fumes are generated in the environment where the range hood is located. The first oil fume concentration value at the air intake obtained by the oil fume sensor within a first time period can be understood as the no-oil-fume concentration value. The oil fume concentration threshold under oil fume generation conditions in the environment where the range hood is located can be predicted based on this no-oil-fume concentration value. It is understood that, under different conditions of oil fume blockage, the no-oil-fume concentration value detected in a smoke-free environment and the oil fume concentration value detected in a smoky environment should have a certain relationship. Therefore, the oil fume concentration threshold under oil fume generation conditions can be predicted based on the first oil fume concentration value at the air intake within a first time period when the range hood is powered on but not activated. Then, the second oil fume concentration value at the air intake when the range hood is activated is compared with the oil fume concentration threshold. When the second oil fume concentration value is detected to be above the oil fume concentration threshold, it is determined that oil fumes are generated in the environment where the range hood is located, and the fan assembly is then controlled to start working.

[0105] In this way, the oil fume concentration threshold under oil fume conditions is predicted based on the oil fume concentration value under no oil fume conditions. This reduces the impact of the oil fume sensor being in different dirt and blockage conditions on the accuracy of oil fume concentration detection, and ensures the accuracy of the oil fume sensor in detecting oil fume concentration under different dirt and blockage conditions. This allows for timely control of the fan component to start working when oil fume is detected, improving the accuracy of determining the timing of fan component start-up and helping to improve the user experience.

[0106] In some embodiments, such as Figure 6 As shown, after step S104 above, the method further includes the following steps:

[0107] S201. Obtain the third oil fume concentration value at the air intake.

[0108] In some embodiments, in order to detect in a timely manner that there is no oil fume in the environment where the range hood is located, so as to control the fan assembly to stop working in a timely manner to reduce the consumption of power resources, after controlling the fan assembly to start working, the controller obtains the third oil fume concentration value at the air intake in real time through the oil fume sensor.

[0109] S202. When the third oil fume concentration value is detected to be below the oil fume concentration threshold, the fan assembly is controlled to stop working.

[0110] Understandably, when the third oil fume concentration value detected at the air intake is below the oil fume concentration threshold, it means that there is no oil fume in the environment where the range hood is located, and the controller can control the fan component to stop working, thereby reducing the consumption of power resources.

[0111] The above embodiments focus on how the controller controls the fan assembly to turn on or off based on the oil fume concentration value obtained by the range hood. In some embodiments, such as Figure 7 As shown, after the control fan assembly starts working, that is, after step S104 above, the method further includes the following steps:

[0112] S301. Record the cumulative runtime of the wind turbine components.

[0113] In some embodiments, in order to update the fume concentration threshold in a timely manner and ensure the accuracy of the fume concentration sensor in detecting fume concentration, after the controller starts controlling the fan assembly to start working, the controller starts recording the cumulative running time of the fan assembly and stores the information of the cumulative running time in the memory.

[0114] During the use of a range hood, oil fume particles accumulate on the fume sensor over time. The more oil fume particles accumulate on the sensor, the lower its sensitivity. The cumulative operating time of the fan assembly can, to some extent, reflect the usage of the range hood and the degree of oil fume particle accumulation on the fume sensor.

[0115] S302. After detecting that the cumulative running time of the fan assembly has reached the preset time, while the range hood is powered on but not started, obtain the fourth oil fume concentration value of the air intake in the second time period.

[0116] Understandably, after the cumulative running time of the fan assembly reaches the preset duration, the amount of oil fume particles attached to the oil fume sensor may be greater than the amount attached before the preset duration was reached. This leads to a decrease in the sensitivity of the oil fume sensor, so the first oil fume concentration value cannot be used as the oil-free value when the environment around the range hood is free of oil fumes. Therefore, after the cumulative running time of the fan assembly reaches the preset duration, while the range hood is powered on but not started, the fourth oil fume concentration value at the air intake during the second time period is obtained, and this fourth oil fume concentration value is used as the oil-free value when the environment around the range hood is free of oil fumes.

[0117] The preset duration can be set at the factory, for example, the preset duration is 60 hours (H). That is, after the cumulative running time of the fan component reaches 60 hours, the fourth oil fume concentration value of the air intake in the second time period is obtained when the range hood is powered on but not started.

[0118] The description of the second time period can be found in the description of the first time period above, and will not be repeated here.

[0119] S303. Based on the fourth oil fume concentration value, redetermine the oil fume concentration threshold.

[0120] The description of how to redetermine the fume concentration threshold based on the fourth fume concentration value can be found in the above description of determining the fume concentration threshold based on the first fume concentration value, and will not be repeated here.

[0121] based on Figure 7 The embodiment shown has at least the following beneficial effects: after the cumulative running time of the fan component is detected to reach a preset value, the oil fume concentration threshold is re-determined based on the fourth oil fume concentration value of the air intake in the second time period while the range hood is powered on but not started. That is, the oil fume concentration threshold is periodically updated to ensure the accuracy of the oil fume concentration sensor in detecting oil fume concentration.

[0122] The above embodiments focus on the process of re-confirming the oil fume concentration threshold after the range hood has been running for a period of time. In some embodiments, such as Figure 8 As shown, after step S303 above, the method further includes the following steps:

[0123] S401. If the difference between the oil fume concentration threshold before and after the redetering is greater than the preset difference, the control display device and / or voice prompt device shall issue a cleaning prompt message.

[0124] Understandably, the initial fume concentration threshold is based on a first fume concentration value, while the revised threshold is based on a fourth fume concentration value. If the difference between the initial and revised thresholds exceeds a preset value, it indicates a significant discrepancy between the first and fourth fume concentration values. This can be interpreted as severe clogging of the fume sensor, leading to a large difference in the detected fume concentration in a smoke-free environment. Therefore, when the difference between the initial and revised thresholds exceeds the preset value, the controller activates the display and / or voice prompt device to issue a cleaning reminder. This preset difference can be pre-set at the factory, and the cleaning reminder prompts the user to clean the fume sensor.

[0125] For example, the cleaning prompt message issued by the controller's display device and / or voice prompt device could be "The fume sensor is clogged; please clean it promptly."

[0126] Thus, the system determines whether the fume concentration sensor needs cleaning based on the difference between the previously set and now set fume concentration thresholds. If the difference exceeds a preset threshold, a cleaning prompt is issued to remind the sensor to be cleaned. This prevents the sensor from becoming clogged and affecting the accuracy of fume concentration detection, ensuring the sensor's precision. This allows the system to promptly activate the fan assembly when fume is detected in the environment, guaranteeing a good cooking experience, and to deactivate the fan assembly when no fume is detected, reducing energy waste and enhancing the range hood's intelligence.

[0127] The following example illustrates a control method for a range hood provided in this application. Figure 9 The diagram shown is an overall flow chart of a control method for a range hood provided in this application according to an exemplary embodiment.

[0128] like Figure 9 As shown, after the range hood is powered on, it is in a non-started state. The system acquires a first oil fume concentration value at the air intake during a first time period and predicts a threshold oil fume concentration based on this first value and an oil fume concentration threshold prediction model. When the range hood is in the start-up state, a second oil fume concentration value at the air intake is acquired. If the second oil fume concentration value is below the oil fume concentration threshold, the fan assembly is put into standby mode. If the second oil fume concentration value is above the oil fume concentration threshold, the fan assembly is started working. After the fan assembly starts working, a third oil fume concentration value at the air intake is acquired. If the third oil fume concentration value is below the oil fume concentration threshold, the fan assembly is put into standby mode. If the third oil fume concentration value is above the oil fume concentration threshold, the fan assembly continues to work.

[0129] While the fan assembly starts working, the cumulative running time of the fan assembly is recorded. If the cumulative running time of the fan assembly reaches a preset duration, and the range hood is powered on but not started, the fourth oil fume concentration value of the air intake during the second time period is obtained. The oil fume concentration threshold is then re-determined based on the oil fume concentration threshold prediction model. If the difference between the oil fume concentration threshold before and after the re-determining is greater than a preset difference, the control display device and / or voice prompt device will issue a cleaning prompt message to remind the oil fume sensor to be cleaned.

[0130] This application embodiment can divide the controller into functional modules according to the above method example. For example, each function can be divided into a separate functional module, or two or more functions can be integrated into one processing module. The integrated module can be implemented in hardware or as a software functional module. Optionally, the module division in this application embodiment is illustrative and only represents one logical functional division; other division methods may be used in actual implementation.

[0131] This application also provides a hardware structure diagram of a controller, such as... Figure 10 As shown, the controller 3000 includes a processor 3001, and optionally, a memory 3002 and a communication interface 3003 connected to the processor 3001. The processor 3001, memory 3002 and communication interface 3003 are connected via a bus 3004.

[0132] Processor 3001 may be a central processing unit (CPU), a general-purpose processor, a network processor (NP), a digital signal processor (DSP), a microprocessor, a microcontroller, a programmable logic device (PLD), or any combination thereof. Processor 3001 may also be any other device with processing capabilities, such as a circuit, device, or software module. Processor 3001 may also include multiple CPUs, and processor 3001 may be a single-core processor or a multi-core processor. Here, "processor" may refer to one or more devices, circuits, or processing cores used to process data (e.g., computer program instructions).

[0133] The memory 3002 can be a read-only memory (ROM) or other type of static storage device capable of storing static information and instructions, random access memory (RAM) or other type of dynamic storage device capable of storing information and instructions. It can also be an electrically erasable programmable read-only memory (EEPROM), a compact disc read-only memory (CD-ROM) or other optical disc storage, optical disc storage (including compressed optical discs, laser discs, optical discs, universal optical discs, Blu-ray discs, etc.), a magnetic disk storage medium, or other magnetic storage device, or any other medium capable of carrying or storing desired program code in the form of instructions or data structures and accessible by a computer. This application embodiment does not impose any limitations on this. The memory 3002 can exist independently or be integrated with the processor 3001. The memory 3002 may contain computer program code. The processor 3001 executes the computer program code stored in the memory 3002 to implement the range hood control method provided in this application embodiment.

[0134] The communication interface 3003 can be used to communicate with other devices or communication networks (such as Ethernet, radio access network (RAN), wireless local area networks (WLAN), etc.). The communication interface 3003 can be a module, circuit, transceiver, or any device capable of enabling communication.

[0135] Bus 3004 can be a Peripheral Component Interconnect (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. Bus 3004 can be divided into address bus, data bus, control bus, etc. For ease of representation, Figure 10 The bus is represented by a single thick line, but this does not mean that there is only one bus or one type of bus.

[0136] This application also provides a computer-readable storage medium, which includes computer-executable instructions. When the computer-executable instructions are executed on the computer, the computer performs the control method for the range hood provided in the above embodiments.

[0137] This application also provides a computer program product that can be directly loaded into a memory and contains software code. After being loaded and executed by a computer, the computer program product can realize the range hood control method provided in the above embodiments.

[0138] Those skilled in the art will recognize that, in one or more of the examples above, the functions described in this application can be implemented using hardware, software, firmware, or any combination thereof. When implemented in software, these functions can be stored in a computer-readable medium or transmitted as one or more instructions or code on a computer-readable medium. Computer-readable media include computer storage media and communication media, wherein communication media include any medium that facilitates the transfer of a computer program from one place to another. Storage media can be any available medium accessible to a general-purpose or special-purpose computer.

[0139] Through the above description of the embodiments, those skilled in the art can clearly understand that, for the sake of convenience and brevity, only the division of the above functional modules is used as an example. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0140] In the several embodiments provided in this application, it should be understood that the disclosed apparatus and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of modules or units is only a logical functional division, and other division methods may exist in actual implementation. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. Furthermore, the shown or discussed mutual couplings, direct couplings, or communication connections may be through some interfaces; indirect couplings or communication connections between devices or units may be electrical, mechanical, or other forms. Units described as separate components may or may not be physically separate; components shown as units may be one physical unit or multiple physical units, i.e., they may be located in one place or distributed in multiple different places. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0141] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit. If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiments of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This software product is stored in a storage medium and includes several instructions to cause a device (which may be a microcontroller, chip, etc.) or processor to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, ROM, RAM, magnetic disks, or optical disks.

[0142] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any changes or substitutions within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A range hood, characterized in that, include: The machine body is provided with an air intake and an exhaust port, and an air duct is formed between the air intake and the exhaust port; A fan assembly is disposed within the air duct, through which airflow introduced from the air intake passes through the air duct and is discharged from the exhaust port; An oil fume sensor is disposed at the air intake and is used to detect the oil fume concentration value at the air intake. as well as, The controller is configured as follows: When the range hood is powered on but not started, the oil fume sensor obtains the first oil fume concentration value of the air intake during a first time period. Based on the first oil fume concentration value, the oil fume concentration threshold is predicted; With the range hood in the start-up state, the second oil fume concentration value of the air intake is obtained; When the second oil fume concentration value is detected to be above the oil fume concentration threshold, the fan assembly is controlled to start working; After the fan assembly is started to work, the third oil fume concentration value of the air intake is obtained; When the third oil fume concentration value is detected to be below the oil fume concentration threshold, the fan assembly is controlled to stop working; After the wind turbine assembly is started to operate, the cumulative operating time of the wind turbine assembly is recorded; After detecting that the cumulative running time of the fan assembly has reached a preset time, in the state where the range hood is powered on but not started, the fourth oil fume concentration value of the air intake during the second time period is obtained. Based on the fourth oil fume concentration value, the oil fume concentration threshold is re-determined.

2. The range hood according to claim 1, characterized in that, The range hood also includes: A display device is used to display the working status of the range hood; A voice prompt device for playing prompt messages; The controller is configured to, after redetermining the oil fume concentration threshold based on the fourth oil fume concentration value, further configure itself to: If the difference between the oil fume concentration threshold before and after the redetering is greater than a preset difference, then the display device and / or the voice prompt device are controlled to issue a cleaning prompt message, which is used to prompt the oil fume sensor to be cleaned.

3. The range hood according to any one of claims 1 to 2, characterized in that, When the controller is configured to obtain the first oil fume concentration value of the air intake during a first time period through the oil fume sensor, it specifically performs the following steps: Obtain the oil fume concentration value of the air intake at each of N times within the first time period, where N is an integer greater than 1; The average value of the oil fume concentration at the N times is taken as the first oil fume concentration value at the air intake during the first time period.

4. A control method for a range hood, characterized in that, The method includes: While the range hood is powered on but not started, the first oil fume concentration value at the air intake is obtained during a first time period. Based on the first oil fume concentration value, the oil fume concentration threshold is predicted; With the range hood in the start-up state, the second oil fume concentration value of the air intake is obtained; When the second oil fume concentration value is detected to be above the oil fume concentration threshold, the control fan assembly starts to work; After the fan assembly is started to work, the third oil fume concentration value of the air intake is obtained; When the third oil fume concentration value is detected to be below the oil fume concentration threshold, the fan assembly is controlled to stop working; After the wind turbine assembly is started to operate, the cumulative operating time of the wind turbine assembly is recorded; After detecting that the cumulative running time of the fan assembly has reached a preset time, in the state where the range hood is powered on but not started, the fourth oil fume concentration value of the air intake during the second time period is obtained. Based on the fourth oil fume concentration value, the oil fume concentration threshold is re-determined.

5. The method according to claim 4, characterized in that, After redetermining the oil fume concentration threshold based on the fourth oil fume concentration value, the method further includes: If the difference between the previously determined fume concentration threshold and the newly determined fume concentration threshold is greater than a preset difference, the control display device and / or voice prompt device will issue a cleaning prompt message, which is used to prompt the fume sensor to be cleaned.

6. The method according to any one of claims 4 to 5, characterized in that, The process of obtaining the first oil fume concentration value at the air intake during the first time period includes: Obtain the oil fume concentration value of the air intake at each of N times within the first time period, where N is an integer greater than 1; The average value of the oil fume concentration at the N times is taken as the first oil fume concentration value at the air intake during the first time period.

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