A control method and device of an extractor hood and the extractor hood

Abstract

The application relates to a control method and device of an oil fume exhauster and the oil fume exhauster. The control method of the oil fume exhauster comprises the following steps: determining whether gas leaks according to data collected by a gas sensing module; determining a gas leakage type if the gas leaks; and determining the position of a leakage source of the leaking gas according to a solving model corresponding to the gas leakage type and the position of the gas sensing module. The application can locate the position of the leakage source when the gas leaks.

Description

Technical Field

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

[0002] Range hoods, as a standard appliance in modern kitchens, are usually installed directly above or to the side of the gas stove to extract the fumes produced during cooking.

[0003] In traditional technology, some range hoods have already integrated gas leak detection functions.

[0004] However, traditional technologies can only detect a gas leak somewhere in the kitchen, but cannot pinpoint the exact location of the leak source within the kitchen space. When a gas leak occurs, users need to repeatedly search for and locate the leak source, which is inefficient. Therefore, accurately locating the leak source has become a pressing technical problem that needs to be solved. Summary of the Invention

[0005] In order to accurately locate the source of leakage, this application provides a control method, device and range hood for a range hood.

[0006] Firstly, this embodiment provides a control method for a range hood, the range hood including a gas sensing module, and the control method for the range hood including:

[0007] Based on the data collected by the gas sensing module, determine whether there is a gas leak;

[0008] If there is a gas leak, determine the type of gas leak;

[0009] Based on the solution model corresponding to the type of gas leak and the location of the gas sensing module, the location of the leak source of the leaking gas is determined.

[0010] In some of these embodiments, if a gas leak occurs, determining the type of gas leak includes:

[0011] If there is a gas leak, calculate the rate of change in gas concentration.

[0012] The type of gas leak is determined based on the rate of change in gas concentration.

[0013] In some embodiments, the gas sensing module includes a first gas sensing module, a second gas sensing module, a third gas sensing module, and a fourth gas sensing module. The first gas sensing module, the second gas sensing module, and the third gas sensing module are spaced apart at the bottom of the range hood along a first direction and are all located in a horizontal plane. The first gas sensing module and the third gas sensing module are located on both sides of the second gas sensing module, and the fourth gas sensing module is located above the horizontal plane.

[0014] When the gas leak type is slow leakage, the solution models corresponding to slow leakage include planar model, angle solution model and distance solution model;

[0015] Based on the solution model corresponding to the type of gas leak and the location of the gas sensing module, the location of the leak source of the leaking gas is determined, including:

[0016] Based on the positions of the first gas sensing module, the second gas sensing module, the third gas sensing module, and the fourth gas sensing module, the data collected by the first gas sensing module, the second gas sensing module, the third gas sensing module, and the fourth gas sensing module, and the planar model, a gradient component solution model is established.

[0017] The gradient component solution model is solved to obtain the gradient components of the gas in the first and second directions; the second direction is perpendicular to the first direction.

[0018] Based on the gradient components of the gas in the first direction, the gradient components of the gas in the second direction, and the angle solution model, the directional angle of the leak source relative to the second gas sensing module is determined.

[0019] Based on the data collected by the second gas sensing module and the distance solution model, the distance of the leakage source relative to the second gas sensing module is determined.

[0020] The location of the leak source is determined based on the position of the second gas sensing module, the azimuth angle of the leak source relative to the second gas sensing module, and the distance of the leak source relative to the second gas sensing module.

[0021] In some embodiments, the gas sensing module further includes a fifth gas sensing module, which is located above the fourth gas sensing module;

[0022] When the gas leak type is rapid leakage, the solution models corresponding to rapid leakage include distance difference solution models and location solution models;

[0023] Based on the solution model corresponding to the type of gas leak and the location of the gas sensing module, the location of the leak source of the leaking gas is determined, including:

[0024] Based on the arrival times of the concentration wavefronts of the first gas sensing module, the second gas sensing module, the third gas sensing module, the fourth gas sensing module, and the fifth gas sensing module, and using a distance difference solution model, the distance difference between the leakage source and the first and second target gas sensing modules is determined; wherein, the first target gas sensing module is the second gas sensing module, and the second target gas sensing module is the first, third, fourth, or fifth gas sensing module.

[0025] Based on the distance difference, the positions of the first gas sensing module, the second gas sensing module, the third gas sensing module, the fourth gas sensing module, the fifth gas sensing module, and the position solving model, the location of the leak source is determined.

[0026] In some embodiments, the control method for the range hood further includes:

[0027] The gas concentration in a target area at a specified future time is predicted using a diffusion trend prediction model.

[0028] In some embodiments, the control method for the range hood further includes:

[0029] Determine whether the gas concentration in the target area will exceed a first preset threshold at a specified future time.

[0030] If the gas concentration in the target area exceeds the first preset threshold at a specified future time, the range hood will be controlled to operate at the first air volume.

[0031] In some embodiments, the control method for the range hood further includes:

[0032] The gas concentration is determined based on the data collected by the gas sensing module;

[0033] Determine whether the gas concentration is greater than a first preset threshold and less than a second preset threshold; the second preset threshold is greater than the first preset threshold.

[0034] If the gas concentration is greater than the first preset threshold and less than the second preset threshold, the range hood will be controlled to operate at the second air volume.

[0035] In some embodiments, the range hood includes an explosion-proof exhaust module, and the control method for the range hood further includes:

[0036] If the gas concentration exceeds the second preset threshold, the power supply to the range hood will be cut off, the gas valve will be closed, and the explosion-proof ventilation module will be activated.

[0037] Secondly, this embodiment provides a control device for a range hood, which includes:

[0038] The first determining module is used to determine whether there is a gas leak based on the data collected by the gas sensing module;

[0039] The second determining module is used to determine the type of gas leak if a gas leak occurs.

[0040] The third determination module is used to determine the location of the leaking gas source based on the solution model corresponding to the type of gas leak and the location of the gas sensing module.

[0041] Thirdly, this embodiment provides a range hood, which includes a gas sensing module and a control module. The gas sensing module is connected to the control module, and the control module is used to execute the control method of the range hood described above.

[0042] Compared with related technologies, in this embodiment, when a gas leak occurs, the type of gas leak is further determined, and the location of the leak source is determined using the solution model corresponding to the gas leak type and the position of the gas sensing module. In this method, as soon as a gas leak occurs, the user can quickly know the location of the leak source without repeated investigations, resulting in high location efficiency and enabling the user to handle the leak situation more promptly and efficiently.

[0043] Details of one or more embodiments of this application are set forth in the following drawings and description to make other features, objects and advantages of this application more readily apparent. Attached Figure Description

[0044] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0045] Figure 1 This is a front view of a range hood provided in an embodiment of this application;

[0046] Figure 2 A schematic flowchart illustrating a control method for a range hood provided in an embodiment of this application;

[0047] Figure 3 A flowchart illustrating step S20 provided in an embodiment of this application;

[0048] Figure 4 This is a side view of a range hood provided in an embodiment of this application;

[0049] Figure 5 A bottom view of a range hood provided in an embodiment of this application;

[0050] Figure 6 A flowchart illustrating step S30 provided in an embodiment of this application;

[0051] Figure 7 A flowchart illustrating step S30 as provided in another embodiment of this application;

[0052] Figure 8 A flowchart illustrating steps S40-S42 provided in an embodiment of this application;

[0053] Figure 9 A flowchart illustrating steps S51-S54 provided in an embodiment of this application;

[0054] Figure 10 This is a structural block diagram of a control device for a range hood provided in an embodiment of this application;

[0055] Figure 11 This is a structural block diagram of a control device for a range hood provided in another embodiment of this application.

[0056] Figure label:

[0057] 1-Range hood; 100-Body; 1000-Front panel; 2001-First gas sensing module; 2002-Second gas sensing module; 2003-Third gas sensing module; 2004-Fourth gas sensing module; 2005-Fifth gas sensing module; 3001-First determination module; 3002-Second determination module; 3003-Third determination module; 3004-Prediction module; 3005-Execution module. Detailed Implementation

[0058] To better understand the purpose, technical solution, and advantages of this application, the application is described and illustrated below in conjunction with the accompanying drawings and embodiments.

[0059] Unless otherwise defined, the technical or scientific terms used in this application shall have the general meaning understood by one of ordinary skill in the art to which this application pertains. Words such as “a,” “an,” “an,” “the,” “the,” and “these” used in this application do not indicate quantitative limitation and may be singular or plural. The terms “comprising,” “including,” “having,” and any variations thereof used in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or device that comprises a series of steps or modules (units) is not limited to the listed steps or modules (units) but may include steps or modules (units) not listed, or may include other steps or modules (units) inherent to these processes, methods, products, or devices. Words such as “connected,” “linked,” and “coupled” used in this application are not limited to physical or mechanical connections but may include electrical connections, whether direct or indirect. “Multiple” used in this application refers to two or more. “And / or” describes the relationship between related objects, indicating that three relationships may exist; for example, “A and / or B” can represent: A alone, A and B simultaneously, and B alone. Normally, the character " / " indicates that the objects before and after it are in an "or" relationship. The terms "first," "second," "third," etc., used in this application are merely to distinguish similar objects and do not represent a specific order of objects.

[0060] One embodiment of this application provides a control method for a range hood, such as... Figure 1 As shown, the range hood 1 includes a body 100, a gas sensing module, and a control module. The gas sensing module is installed on the body 100, and the control module is connected to the gas sensing module. The control module is used to execute the control method of the range hood in this embodiment. The range hood 1 in this embodiment can be applied in application scenarios where gas is present. For ease of explanation, this embodiment takes the application of the range hood 1 in the kitchen as an example. Gas is prone to leakage. The method in this embodiment can accurately locate the location of the leakage source when gas leakage occurs. The method is explained below.

[0061] like Figure 2 As shown, the method includes the following steps S10-S30:

[0062] Step S10: Determine whether there is a gas leak based on the data collected by the gas sensing module.

[0063] The gas sensing module can be one or more. When there are multiple gas sensing modules, they can be set at different positions on the main body 100.

[0064] The gas sensing module collects the original concentration sequence at the location of the gas sensing module in real time according to the preset sampling frequency. In this step, the control module can control the module to eliminate high-frequency noise interference in the original concentration sequence by using the first-order hysteresis filtering method shown in (1) after obtaining the original concentration sequence, thereby obtaining the gas concentration at the location of the gas sensing module.

[0065] (1)

[0066] in, Let be the original concentration sequence at time t collected by the i-th gas sensing module. This represents the gas concentration at the location of the i-th gas sensing module at time t after filtering. After filtering The gas concentration at the location of the i-th gas sensing module at time i; λ is the filtering coefficient, which is related to the sampling frequency of the gas sensing module and is located between 0.15 and 0.25.

[0067] For example, when the sampling frequency is 2Hz, λ is 0.2.

[0068] Furthermore, the control module has a pre-stored concentration threshold. The gas concentration is compared with the concentration threshold. If the gas concentration at any gas sensor location is greater than the concentration threshold, it indicates that a gas leak has occurred. At this time, the control module can execute the following step S20. If the gas concentration is less than or equal to the concentration threshold, it indicates that no gas leak has occurred. At this time, the control module can continue to execute this step to detect whether a gas leak has occurred in real time.

[0069] Step S20: If there is a gas leak, determine the type of gas leak.

[0070] In this step, if a gas leak occurs, the control module can further determine the type of gas leak. Specifically, the control module can determine the rate of gas leakage based on the gas concentration. If the gas leak is rapid, the type of gas leak is a rapid leak; if the gas leak is slow, the type of gas leak is a slow leak. After determining the type of gas leak, the control module can execute the following step S30.

[0071] Step S30: Determine the location of the leak source of the leaking gas based on the solution model corresponding to the type of gas leak and the location of the gas sensing module.

[0072] Taking the application of range hood 1 in a family kitchen as an example, a family kitchen is generally equipped with a gas pipeline for transporting gas and a solenoid valve for controlling the opening and closing of the gas pipeline. When the gas pipeline is damaged, the location of the gas pipeline damage is the source of leakage, and when the solenoid valve is not closed tightly, the solenoid valve is the source of leakage.

[0073] In this step, the control module can determine the location of the leaking gas source based on the solution model corresponding to the type of gas leak and the location of the gas sensing module.

[0074] Specifically, a three-dimensional coordinate system can be defined, and the control module stores the three-dimensional coordinate position of the gas sensing module. After determining the type of gas leak, the control module substitutes the three-dimensional coordinates of the gas sensing module into the solution model to obtain the three-dimensional coordinates of the leak source in the three-dimensional coordinate system, thereby determining the location of the leak source.

[0075] After obtaining the location of the leak source, the control module can display the location of the leak source on the display interface of the range hood 1. Alternatively, the control module can connect to a user terminal network such as a mobile phone, tablet, or smart bracelet, and send the location of the leak source to the user terminal so that the user can more accurately locate the leak source and facilitate the user's subsequent handling of the leak.

[0076] As can be seen from the above, in this embodiment, when a gas leak occurs, the type of gas leak is further determined, and the location of the leak source is determined using the solution model corresponding to the gas leak type and the position of the gas sensing module. In this method, once a gas leak occurs, the user can quickly identify the leak source without repeated investigations, resulting in high location efficiency and enabling the user to handle the leak situation more promptly and efficiently.

[0077] It is understandable that, such as Figure 3 As shown, step S20 above may further include the following steps S21 and S22:

[0078] Step S21: If there is a gas leak, calculate the rate of change of gas concentration.

[0079] In this step, when a gas leak occurs, the control module can calculate the rate of change of gas concentration. Specifically, the control module can calculate the rate of change of gas concentration using the following formula (2).

[0080] (2)

[0081] in, This represents the gas concentration at the location of the i-th gas sensing module at time t after filtering. After filtering The gas concentration at the location of the i-th gas sensing module at time i. Let be the rate of change of gas concentration at the location of the i-th gas sensing module at time t.

[0082] Step S22: Determine the type of gas leak based on the rate of change in gas concentration.

[0083] In this step, the control module can directly compare the rate of change of gas concentration at the location of the gas sensing module with a preset rate threshold.

[0084] In one implementation, if the rate of change of gas concentration is greater than a preset rate threshold, the leak type is considered a rapid leak; if the rate of change of gas concentration is less than or equal to the preset rate threshold, the leak type is considered a slow leak.

[0085] In one implementation, if the rate of change of gas concentration at the locations of at least two gas sensing modules is greater than a preset rate threshold within three consecutive sampling periods, the leak type is considered a rapid leak; if the rate of change of gas concentration at the locations of at least two gas sensing modules is less than or equal to a preset rate threshold within three consecutive sampling periods, the leak type is considered a slow leak.

[0086] In one implementation, the control module can input the rate of change of gas concentration at the location of each gas sensing module into the following formula (3) to calculate the global transient intensity.

[0087] (3)

[0088] in, Let N be the rate of change of gas concentration at the location of the i-th gas sensing module at time t, and let N be the number of gas sensing modules. For example, N can be equal to 3, 4, or 5, etc. This represents the global transient intensity.

[0089] Global transient intensity characterizes the degree of drastic change in overall gas concentration in the application scenario where range hood 1 is located, such as a kitchen. If the global transient intensity is small, it indicates that the overall change in gas concentration is not drastic, and the leakage type is slow leakage. If the global transient intensity is large, it indicates that the overall change in gas concentration is large, and the leakage type is rapid leakage.

[0090] It is understandable that in practice, gas sensing modules may have multiple sensors, such as... Figure 4 as well as Figure 5 As shown, the gas sensing module may include a first gas sensing module 2001, a second gas sensing module 2002, a third gas sensing module 2003, and a fourth gas sensing module 2004. The first gas sensing module 2001, the second gas sensing module 2002, and the third gas sensing module 2003 are spaced apart along a first direction at the bottom of the range hood 1 and are all located in the horizontal plane. The first gas sensing module 2001 and the third gas sensing module 2003 are located on both sides of the second gas sensing module 2002, and the fourth gas sensing module 2004 is located above the horizontal plane.

[0091] Taking a user's home kitchen as an example, with the range hood 1 located above the cooktop, a three-dimensional coordinate system is established. The origin of the coordinate system is the vertical projection of the geometric center of the bottom air intake panel of the range hood 1 onto the cooktop surface. The left-right direction when the user is facing the range hood 1 is the X-axis, the right-hand direction pointing towards the user when facing the range hood 1 is the positive X-axis, the front-back direction when facing the range hood 1 is the Y-axis, and the direction pointing towards the user when facing the range hood 1 is the positive Y-axis. Both the X and Y axes are parallel to the cooktop surface. The up-down direction perpendicular to the cooktop surface when the user is facing the range hood 1 is the Z-axis, and the vertical upward direction perpendicular to the cooktop surface when facing the range hood 1 is the positive Z-axis. The first direction mentioned above refers to the X-axis, and both the X and Y axes lie in the horizontal plane. Figure 1 , Figure 4 as well as Figure 5 The diagram only shows the positive directions of each coordinate axis, and the origin of the coordinate system is only a schematic position and does not represent the actual position of the origin.

[0092] The coordinates of the first gas sensing module 2001, the second gas sensing module 2002, the third gas sensing module 2003, and the fourth gas sensing module 2004 in a three-dimensional coordinate system are shown in Table 1 below. It is understood that the values ​​of a, b, h, d, and H0 will vary depending on the actual installation location of each gas sensing module. In this application, we will use a=0.25m, b=0.1m, d=0.15m, h=0.35m, and H0=0.4m as an example for illustration.

[0093] Table 1 Gas Sensing Module Parameter Table

[0094]

[0095] It is understandable that when the gas leak type is slow leakage, the solution models corresponding to slow leakage include planar models, angle solution models, and distance solution models. In this case, such as... Figure 6 As shown, step S30 above may further include the following steps:

[0096] Step S311: Based on the positions of the first gas sensing module 2001, the second gas sensing module 2002, the third gas sensing module 2003, the fourth gas sensing module 2004, the data collected by the first gas sensing module 2001, the second gas sensing module 2002, the third gas sensing module 2003, the fourth gas sensing module 2004, and the planar model, establish a gradient component solution model.

[0097] The positions of the first gas sensing module 2001, the second gas sensing module 2002, the third gas sensing module 2003, and the fourth gas sensing module 2004 refer to the positions of each gas sensing module in the three-dimensional coordinate system. For specific positions, please refer to Table 1 above, which will not be repeated here.

[0098] The data collected by each gas sensing module is the original concentration sequence at the location of the gas sensing module. The gas concentration at the location of the gas sensing module can be obtained by filtering the original concentration sequence. For details of the filtering method, please refer to the above embodiment, which will not be repeated here.

[0099] In this embodiment, the control module can establish the gradient component solution model shown in (4) below based on the position of the first gas sensing module 2001, the position of the second gas sensing module 2002, the position of the third gas sensing module 2003, the position of the fourth gas sensing module 2004, the gas concentration at the position of the first gas sensing module 2001, the gas concentration at the position of the second gas sensing module 2002, the gas concentration at the position of the third gas sensing module 2003, the gas concentration at the position of the fourth gas sensing module 2004, and the planar model. At this time, the control module can continue to execute the following step S312.

[0100] (4)

[0101] in, Let represent the gas concentration at the location of the i-th gas sensing module at time t, where i = 1 represents the first gas sensing module 2001, i = 2 represents the second gas sensing module 2002, and so on. It is a planar model; Let X be the X coordinate of the i-th gas sensing module. Let Y be the Y coordinate of the i-th gas sensing module.

[0102] Step S312: Solve the gradient component solution model to obtain the gradient components of the gas in the first and second directions.

[0103] Wherein, the second direction is perpendicular to the first direction and is the Y-axis direction; the gradient component of the gas in the first direction refers to the rate of change of the gas along the first direction; the gradient component of the gas in the second direction refers to the rate of change of the gas along the second direction.

[0104] In this step, in the gradient component solution model, the control module can set... The matrix equation shown in (5) is obtained as follows:

[0105] (5)

[0106] Furthermore, by solving the above matrix equation, the gradient component of the gas concentration in the first direction can be obtained. And obtain the gradient component of the gas concentration in the second direction. .

[0107] After obtaining the gradient components, the control module can execute the following step S313.

[0108] Step S313: Determine the direction angle of the leak source relative to the second gas sensing module 2002 based on the gradient component of the gas in the first direction, the gradient component of the gas in the second direction, and the angle solution model.

[0109] The direction angle of the leakage source relative to the second gas sensing module 2002 is the angle of the straight line formed by connecting the second gas sensing module 2002 and the leakage source in the spatial coordinate system relative to the X-axis.

[0110] In this step, the control module can substitute the gradient component of the gas in the first direction and the gradient component of the gas in the second direction into the angle solution model as shown in (6) below. After substitution, the direction angle of the leakage source relative to the second gas sensing module 2002 can be obtained, and the control module can continue to execute the following step S314.

[0111] (6)

[0112] in, The angle of the leak source relative to the second gas sensing module 2002.

[0113] It is understandable that in this step, the direction of the leak source is determined based on the second gas sensing module 2002. In practice, other gas sensing modules can also be used as a reference to determine the direction of the leak source.

[0114] Step S314: Based on the data collected by the second gas sensing module 2002 and the distance solution model, determine the distance of the leakage source relative to the second gas sensing module 2002.

[0115] The location of the leak source cannot be accurately determined solely by its direction. Therefore, in this step, the control module can also determine the distance between the leak source and the second gas sensing module 2002 based on the data collected by the second gas sensing module 2002 and the distance calculation model.

[0116] Specifically, the gas concentration at the location of the second gas sensing module 2002 can be obtained by filtering the original concentration sequence collected by the second gas sensing module 2002. The control module can substitute the gas concentration at the location of the second gas sensing module 2002 into the distance solution model (7). After substitution, the distance between the leak source and the second gas sensing module 2002 can be obtained. The control module can then continue to execute the following step S315.

[0117] (7)

[0118] in, Let Q be the distance between the leak source and the second gas sensing module 2002, and let Q be the effective intensity of the leak source. Q can be obtained by the following formula (8). For the effective turbulent diffusion coefficient, It can be obtained through coefficient formula (9). The highest gas concentration detected is the gas concentration at the location of the second gas sensing module 2002 in this embodiment. The background concentration is the average gas concentration in the kitchen at a specified time before the leak occurred. This average concentration can be calculated by averaging the gas concentration at the location of each gas sensing module. For example, the specified time can be 30 seconds.

[0119] (8)

[0120] in, For kitchen volume; The mixing time constant (taken as 30~60s); The average concentration change rate can be obtained by averaging the gas concentration change rates at all gas sensing module locations.

[0121] (9)

[0122] in, T represents the current temperature (°C); H represents the current humidity (%RH). Temperature sensors can be installed in the kitchen, and the control module can determine the current temperature based on the sensor's readings. Similarly, humidity sensors can be installed in the kitchen, and the control module can determine the current humidity based on the humidity sensor's readings.

[0123] Step S315: Determine the location of the leak source based on the position of the second gas sensing module 2002, the azimuth angle of the leak source relative to the second gas sensing module 2002, and the distance of the leak source relative to the second gas sensing module 2002.

[0124] In this step, the control module can determine the coordinates of the leak source in the three-dimensional coordinate system based on the position of the second gas sensing module 2002, the orientation angle of the leak source relative to the second gas sensing module 2002, and the distance of the leak source relative to the second gas sensing module 2002. Specifically, the coordinates are... .in, The X-coordinate of the second gas sensing module 2002 in the three-dimensional coordinate system. The Y-coordinate of the second gas sensing module 2002 in the three-dimensional coordinate system. The directional angle of the leak source relative to the second gas sensing module 2002. This represents the distance of the leak source relative to the second gas sensing module 2002. Furthermore, since gas leaks are generally located near the stove, the Z-coordinate of the leak source is equal to 0.

[0125] It is understandable that, such as Figure 4 As shown, the gas sensing module may further include a fifth gas sensing module 2005, which is located above the fourth gas sensing module 2004. In this case, the coordinates of the first gas sensing module 2001, the second gas sensing module 2002, the third gas sensing module 2003, the fourth gas sensing module 2004, and the fifth gas sensing module 2005 in the three-dimensional coordinate system are shown in Table 2 below. In this application, c=0.15m and H=0.6m are used as an example for illustration. The definition of the three-dimensional coordinate system is detailed in the above embodiments and will not be repeated here.

[0126] Table 2 Gas Sensing Module Parameter Table

[0127]

[0128] It is understandable that when the gas leak is a rapid leak, the solution model for rapid leaks includes both a distance difference solution model and a location solution model; in this case, such as Figure 7 As shown, step S30 above may further include the following steps:

[0129] Step S321: Based on the arrival time of the concentration wavefront of the first gas sensing module 2001, the arrival time of the concentration wavefront of the second gas sensing module 2002, the arrival time of the concentration wavefront of the third gas sensing module 2003, the arrival time of the concentration wavefront of the fourth gas sensing module 2004, the arrival time of the concentration wavefront of the fifth gas sensing module 2005, and the distance difference solution model, determine the distance difference between the leakage source and the first target gas sensing module and the second target gas sensing module.

[0130] Wherein, the first target gas sensing module is the second gas sensing module 2002, and the second target gas sensing module is either the first gas sensing module 2001, the third gas sensing module 2003, the fourth gas sensing module 2004, or the fifth gas sensing module 2005. When the distance between the leakage source and the first target gas sensing module is L1, and the distance between the leakage source and the second target gas sensing module is L2, the distance difference between the leakage source and the first and second target gas sensing modules is the absolute value of L1-L2.

[0131] The following formula (10) exists:

[0132] (10)

[0133] in, Let be the rate of change of gas concentration at the location of the i-th gas sensing module at time t. Let be the acceleration of the change in gas concentration at the location of the i-th gas sensing module at time t; In order to be in The rate of change of gas concentration at the location of the gas sensing module at time i.

[0134] When i=1, setting the above formula to 0 yields the arrival time t1 of the concentration wavefront of the first gas sensing module 2001; when i=2, setting the above formula to 0 yields the arrival time t2 of the concentration wavefront of the second gas sensing module 2002; when i=3, setting the above formula to 0 yields the arrival time t3 of the concentration wavefront of the third gas sensing module 2003; when i=4, setting the above formula to 0 yields the arrival time t4 of the concentration wavefront of the fourth gas sensing module 2004; and when i=5, setting the above formula to 0 yields the arrival time t5 of the concentration wavefront of the fifth gas sensing module 2005.

[0135] In this step, the control module can substitute t1, t2, t3, t4, and t5 into the distance difference solution model (11). After substitution, the distance difference between the leakage source and the first target gas sensing module and the second target gas sensing module can be obtained.

[0136] (11)

[0137] in, The equivalent wavefront propagation velocity can be determined by the following formula (12).

[0138] When i=1, the second target gas sensing module is the first gas sensing module 2001. The distance difference between the leak source and the first gas sensing module 2001 and the second gas sensing module 2002 can be obtained using the above formula (11). When i=3, the second target gas sensing module is the third gas sensing module 2003. The distance difference between the leak source and the third gas sensing module 2003 and the second gas sensing module 2002 can be obtained using the above formula (11). When i=4, the second target gas sensing module is the fourth gas sensing module 2004. The distance difference between the leak source and the fourth gas sensing module 2004 and the second gas sensing module 2002 can be obtained using the above formula (11). When i=5, the second target gas sensing module is the fifth gas sensing module 2005. At this time, the distance difference between the leakage source and the fifth gas sensing module 2005 and the second gas sensing module 2002 can be obtained by using the above formula (11). After obtaining the above distance difference, the control module can continue to execute the following step S322.

[0139] (12)

[0140] in, The reference wavefront velocity can be measured in advance based on the temperature and humidity in the kitchen. For example, when the temperature is 25°C, the humidity is 50%RH and there is no ventilation, the reference wavefront velocity can be 0.18m / s. The reference temperature can be, for example, 25°C. The reference humidity is, for example, 50%RH; This is a temperature correction factor; for example, the temperature correction factor can be +0.003 (m / s) / ℃. This is a humidity correction factor; for example, the humidity correction factor can be -0.0008(m / s) / %RH. For example, the ventilation impact factor is... It can be 0.02; The current static pressure of the fan inside range hood 1 can be obtained from the fan speed-static pressure curve; For example, the air density can be 1.2 kg / m³.

[0141] Step S322: Determine the location of the leak source based on the distance difference, the position of the first gas sensing module 2001, the position of the second gas sensing module 2002, the position of the third gas sensing module 2003, the position of the fourth gas sensing module 2004, the position of the fifth gas sensing module 2005, and the location solution model.

[0142] In this step, the control module can substitute the distance difference, the position of the first gas sensing module 2001, the position of the second gas sensing module 2002, the position of the third gas sensing module 2003, the position of the fourth gas sensing module 2004, and the position of the fifth gas sensing module 2005 into the position solving model shown in (13) below:

[0143] (13)

[0144] The coordinates of the leakage source are: When i=1, i=2, i=3, i=4, four equations can be obtained, each containing three unknowns. By solving these four equations, the specific values ​​of the leakage source coordinates can be obtained.

[0145] As can be seen from the above, this application can adaptively use different solution methods to determine the location of the leakage source according to the specific type of leakage source, with high calculation accuracy and precision.

[0146] Understandably, when a gas leak occurs, the control module can also predict the gas concentration in a specific area at a future specified time. Therefore, for example... Figure 8 As shown, the control method for a range hood may also include the following steps:

[0147] Step S40: Use a diffusion trend prediction model to predict the gas concentration in the target area at a specified future time.

[0148] In this step, the control module can use the diffusion trend prediction model (14) to predict the gas concentration in the target area at a specified future time. The target area is the application scenario of range hood 1. When range hood 1 is used in the kitchen, the target area is the kitchen area. For example, the specified future time can be 40s, 50s or 60s away from the current time.

[0149] (14)

[0150] Where (x, y, z) are the coordinates of a point in the target region. It can be obtained through the following formula (15).

[0151] (15)

[0152] in, , Let be the diffusion width of the gas in the X direction; Let be the diffusion width of the gas in the Y direction; , H represents the diffusion width of the gas in the Z direction; H is the distance from the leak source to the kitchen floor. Specify a time for the future. Let i be the release time of the i-th smoke cloud; the above The effective wind speed of range hood 1 can be determined by the following formula (16). For example, when range hood 1 is in the low setting, the effective wind speed is: When the range hood is set to the highest setting (1), its effective fan speed is: .

[0153] (16)

[0154] The above formula (15) means that for the i-th smoke cloud, from the time it is released... By a specified time in the future It has already spread. The time at which this will happen at a specified future time. The concentration contributed by the i-th smoke plume at position (x, y, z). After calculating the concentration contributed by all smoke plumes i equal to 1 to F at position (x, y, z), the concentration can be obtained by summing the results using the diffusion trend prediction model (14) described above, at a specified future time. The concentration of the gas at that location.

[0155] In the above diffusion trend prediction model (14), This feature takes into account the reflection of gas from the ground, thus enabling more accurate prediction of gas concentration.

[0156] The gas concentration at any point in the target area can be predicted using the method described above. After prediction, the gas concentration at that point can be roughly determined at a specified future time. Distribution of gas in the target area.

[0157] Traditional technologies only trigger alarms or ventilation after detecting that the current gas concentration exceeds the standard, failing to predict future diffusion paths and concentration trends before the concentration exceeds the standard. For rapid leaks, waiting until the concentration exceeds the standard before responding often results in the loss of the optimal handling opportunity. In this embodiment, the diffusion trend of leaked gas can be predicted in advance, allowing for timely response to rapid leaks and enabling better handling of gas leak situations.

[0158] It is understandable that, such as Figure 8 As shown, after predicting the gas concentration in the target area at a specified future time, the control module can also perform the following steps:

[0159] Step S41: Determine whether the gas concentration in the target area at a future specified time exceeds the first preset threshold.

[0160] In this step, after the control module predicts the gas concentration at multiple points in the target area at a specified future time using the above method, it can calculate the average of the gas concentration at multiple points and then obtain the gas concentration in the target area at the specified future time.

[0161] Furthermore, the control module can determine whether the gas concentration in the target area exceeds the first preset threshold at a future specified time. If it does, the following step S42 is executed; if it does not, the above step S40 is executed.

[0162] Step S42: If the gas concentration in the target area exceeds the first preset threshold at a specified time in the future, control the range hood 1 to operate at the first air volume.

[0163] In this step, when the gas concentration in the target area exceeds a first preset threshold at a specified future time, the control module can control the range hood 1 to operate at a first airflow rate for exhaust. This exhaust reduces the gas concentration in the target area, improving safety.

[0164] It is understandable that the control module can also push early warning notifications to user terminals so that users are aware of gas leaks.

[0165] It is understandable that when the control module detects a gas leak in the kitchen, it can take further action based on the current gas concentration in the kitchen area. For example... Figure 9 As shown, the control method for this range hood may also include the following steps:

[0166] Step S51: Determine the gas concentration based on the data collected by the gas sensing module.

[0167] In this step, the control module can determine the current gas concentration at the location of the gas sensing module based on the data collected by the gas sensing module. For details on the determination method, please refer to the above embodiment, which will not be repeated here.

[0168] It is understood that multiple gas sensing modules can be installed. By averaging the current gas concentration at the locations of multiple gas sensing modules, the gas concentration can be obtained. After obtaining the gas concentration, the control module can execute the following step S52.

[0169] Step S52: Determine whether the gas concentration is greater than the first preset threshold and less than the second preset threshold.

[0170] The second preset threshold is greater than the first preset threshold.

[0171] In this step, the control module can determine whether the gas concentration is greater than a first preset threshold and less than a second preset threshold. If the gas concentration is greater than the first preset threshold and less than the second preset threshold, the control module can execute the following step S53. If the gas concentration is greater than the second preset threshold, the control module can execute the following step S54.

[0172] Step S53: If the gas concentration is greater than the first preset threshold and less than the second preset threshold, control the range hood 1 to operate at the second air volume.

[0173] The second air volume is greater than the first air volume.

[0174] In this step, if the gas concentration is greater than the first preset threshold but less than the second preset threshold, the control module can control the range hood 1 to operate at the second airflow rate for exhaust. This exhaust reduces the gas concentration in the target area, improving safety.

[0175] Understandably, the control module can also control the range hood 1 to emit audible and visual alarm signals; simultaneously, it can push alarm information to the user terminal. Furthermore, it can send control messages to the room's central control module, instructing it to close the kitchen window, or, if a fresh air system is installed, to activate it.

[0176] Step S54: If the gas concentration is greater than the second preset threshold, cut off the power to the range hood 1, close the gas valve, and start the explosion-proof ventilation module.

[0177] In this step, if the gas concentration exceeds the second preset threshold, the control module can cut off the power to the range hood 1. When the gas concentration exceeds the preset threshold, the gas concentration is already very high. At this time, if the range hood 1 is running, the motor of the range hood 1 may generate an electric spark that ignites the gas, posing a serious safety hazard. Therefore, cutting off the power to the range hood 1 in this step effectively solves the above problem.

[0178] Furthermore, the control module can also shut off the gas valve to prevent further gas emissions and reduce safety hazards.

[0179] Furthermore, the range hood 1 can also be equipped with an explosion-proof exhaust module. The control module can control the operation of the explosion-proof exhaust module. Because the explosion-proof exhaust module is set to be explosion-proof, it will not ignite the gas when it is exhausting, thus improving safety.

[0180] Understandably, the control module can also push emergency alarm information to the user terminal and send help signals to preset emergency contacts.

[0181] An embodiment of this application also provides a range hood 1, which includes a gas sensing module and a control module. The control module is connected to the gas sensing module and is used to execute the control method of the range hood described above. The specific structure of the range hood 1 is detailed in the above embodiment and will not be repeated here.

[0182] like Figure 10 As shown, one embodiment of this application also provides a control device for a range hood, comprising:

[0183] The first determining module 3001 is used to determine whether there is a gas leak based on the data collected by the gas sensing module.

[0184] The second determining module 3002 is used to determine the type of gas leak if a gas leak occurs.

[0185] The third determining module 3003 is used to determine the location of the leaking gas source based on the solution model corresponding to the type of gas leak and the location of the gas sensing module.

[0186] It is understandable that the second determining module 3002 is also used for:

[0187] If there is a gas leak, calculate the rate of change in gas concentration; based on the rate of change in gas concentration, determine the type of gas leak.

[0188] It is understandable that the third determining module 3003 is also used for:

[0189] Based on the positions of the first gas sensing module 2001, the second gas sensing module 2002, the third gas sensing module 2003, and the fourth gas sensing module 2004, the data collected by the first gas sensing module 2001, the second gas sensing module 2002, the third gas sensing module 2003, and the fourth gas sensing module 2004, and the planar model, a gradient component solution model is established. The gradient component solution model is solved to obtain the gradient components of the gas combustion gas in the first and second directions; the gradient components in the second direction... Perpendicular to the first direction; based on the gradient components of the gas in the first direction, the gradient components of the gas in the second direction, and the angle solution model, determine the direction angle of the leak source relative to the second gas sensing module 2002; based on the data collected by the second gas sensing module 2002 and the distance solution model, determine the distance of the leak source relative to the second gas sensing module 2002; based on the position of the second gas sensing module 2002, the direction angle of the leak source relative to the second gas sensing module 2002, and the distance of the leak source relative to the second gas sensing module 2002, determine the position of the leak source.

[0190] It is understandable that the third determining module 3003 is also used for:

[0191] Based on the arrival times of the concentration wavefronts of the first gas sensing module 2001, the second gas sensing module 2002, the third gas sensing module 2003, the fourth gas sensing module 2004, and the fifth gas sensing module 2005, and using the distance difference solution model, the distance difference between the leak source and the first and second target gas sensing modules is determined. The first target gas sensing module is the second gas sensing module 2002, and the second target gas sensing module is one of the following: the first gas sensing module 2001, the third gas sensing module 2003, the fourth gas sensing module 2004, or the fifth gas sensing module 2005. Based on the distance difference, the positions of the first, second, third, fourth, and fifth gas sensing modules, and using the position solution model, the location of the leak source is determined.

[0192] In one embodiment, such as Figure 11 As shown, the control device of the range hood also includes:

[0193] The prediction module 3004 is used to predict the gas concentration in a target area at a specified future time using a diffusion trend prediction model.

[0194] In one embodiment, the prediction module 3004 is further configured to:

[0195] Determine whether the gas concentration in the target area at a future specified time exceeds the first preset threshold; if the gas concentration in the target area at a future specified time exceeds the first preset threshold, control the range hood 1 to operate at the first air volume.

[0196] In one embodiment, the control device for the range hood further includes an execution module 3005, such as... Figure 11 As shown, the execution module 3005 is used for:

[0197] Based on the data collected by the gas sensing module, the gas concentration is determined; it is determined whether the gas concentration is greater than the first preset threshold and less than the second preset threshold; if the second preset threshold is greater than the first preset threshold, the range hood 1 is controlled to operate at the second air volume; if the gas concentration is greater than the second preset threshold, the power supply of the range hood 1 is cut off, the gas valve is closed, and the explosion-proof exhaust module is activated.

[0198] In one embodiment, this application also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the steps of the above-described range hood control method.

[0199] In one embodiment, this application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the above-described range hood control method.

[0200] It should be understood that the specific embodiments described herein are merely illustrative of the application and not intended to limit it. All other embodiments derived by those skilled in the art based on the embodiments provided in this application without inventive effort are within the scope of protection of this application.

[0201] Obviously, the accompanying drawings are merely some examples or embodiments of this application. Those skilled in the art can apply this application to other similar situations based on these drawings without any creative effort. Furthermore, it is understood that although the work done in this development process may be complex and lengthy, for those skilled in the art, certain design, manufacturing, or production modifications made based on the technical content disclosed in this application are merely conventional technical means and should not be considered as insufficient disclosure of this application.

[0202] The term "embodiment" in this application refers to a specific feature, structure, or characteristic described in connection with an embodiment that may be included in at least one embodiment of this application. The appearance of this phrase in various places in the specification does not necessarily imply the same embodiment, nor does it imply that it is mutually exclusive with or independent of other embodiments. It will be clearly or implicitly understood by those skilled in the art that the embodiments described in this application may be combined with other embodiments without conflict.

[0203] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of patent protection. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the appended claims.

Claims

1. A control method for a range hood, characterized in that, The range hood includes a gas sensing module, and the control method of the range hood includes: Based on the data collected by the gas sensing module, it is determined whether there is a gas leak; If there is a gas leak, determine the type of gas leak; Based on the solution model corresponding to the type of gas leak and the location of the gas sensing module, the location of the leak source of the leaking gas is determined.

2. The control method for a range hood according to claim 1, characterized in that, If a gas leak occurs, determining the type of gas leak includes: If there is a gas leak, calculate the rate of change in gas concentration; The type of gas leak is determined based on the rate of change in gas concentration.

3. The control method for a range hood according to claim 1, characterized in that, The gas sensing module includes a first gas sensing module, a second gas sensing module, a third gas sensing module, and a fourth gas sensing module. The first gas sensing module, the second gas sensing module, and the third gas sensing module are spaced apart along a first direction at the bottom of the range hood and are all located in a horizontal plane. The first gas sensing module and the third gas sensing module are located on both sides of the second gas sensing module, and the fourth gas sensing module is located above the horizontal plane. When the gas leak type is slow leak, the solution model corresponding to the slow leak includes a planar model, an angle solution model, and a distance solution model; The step of determining the location of the leak source of the leaking gas based on the solution model corresponding to the type of gas leak and the location of the gas sensing module includes: Based on the positions of the first gas sensing module, the second gas sensing module, the third gas sensing module, the fourth gas sensing module, the data collected by the first gas sensing module, the second gas sensing module, the third gas sensing module, the fourth gas sensing module, and the planar model, a gradient component solution model is established. The gradient component solution model is solved to obtain the gradient components of the gas in the first direction and the second direction; the second direction is perpendicular to the first direction. Based on the gradient components of the gas in the first direction, the gradient components of the gas in the second direction, and the angle solution model, the directional angle of the leak source relative to the second gas sensing module is determined. Based on the data collected by the second gas sensing module and the distance solving model, the distance of the leakage source relative to the second gas sensing module is determined; The location of the leak source is determined based on the position of the second gas sensing module, the azimuth angle of the leak source relative to the second gas sensing module, and the distance of the leak source relative to the second gas sensing module.

4. The control method for a range hood according to claim 3, characterized in that, The gas sensing module further includes a fifth gas sensing module, which is located above the fourth gas sensing module; When the gas leak type is a rapid leak, the solution model corresponding to the rapid leak includes a distance difference solution model and a location solution model; The step of determining the location of the leak source of the leaking gas based on the solution model corresponding to the type of gas leak and the location of the gas sensing module includes: Based on the arrival time of the concentration wavefront of the first gas sensing module, the arrival time of the concentration wavefront of the second gas sensing module, the arrival time of the concentration wavefront of the third gas sensing module, the arrival time of the concentration wavefront of the fourth gas sensing module, the arrival time of the wavefront concentration of the fifth gas sensing module, and the distance difference solution model, the distance difference between the leakage source and the first target gas sensing module and the second target gas sensing module is determined; wherein, the first target gas sensing module is the second gas sensing module, and the second target gas sensing module is the first gas sensing module, the third gas sensing module, the fourth gas sensing module, or the fifth gas sensing module; The location of the leak source is determined based on the distance difference, the location of the first gas sensing module, the location of the second gas sensing module, the location of the third gas sensing module, the location of the fourth gas sensing module, the location of the fifth gas sensing module, and the location solution model.

5. The control method for a range hood according to claim 1, characterized in that, The control method for the range hood also includes: The gas concentration in a target area at a specified future time is predicted using a diffusion trend prediction model.

6. The control method for a range hood according to claim 5, characterized in that, The control method for the range hood also includes: Determine whether the gas concentration in the target area at the specified future time exceeds a first preset threshold; If the gas concentration in the target area exceeds a first preset threshold at a specified future time, the range hood will be controlled to operate at a first airflow rate.

7. The control method for a range hood according to claim 1, characterized in that, The control method for the range hood also includes: The gas concentration is determined based on the data collected by the gas sensing module. Determine whether the gas concentration is greater than a first preset threshold and less than a second preset threshold; the second preset threshold is greater than the first preset threshold. If the gas concentration is greater than the first preset threshold and less than the second preset threshold, the range hood is controlled to operate at the second air volume.

8. The control method for a range hood according to claim 7, characterized in that, The range hood includes an explosion-proof exhaust module, and the control method for the range hood further includes: If the gas concentration is greater than the second preset threshold, the power supply to the range hood is cut off, the gas valve is closed, and the explosion-proof ventilation module is activated.

9. A control device for a range hood, characterized in that, The control device for the range hood includes: The first determining module is used to determine whether there is a gas leak based on the data collected by the gas sensing module; The second determining module is used to determine the type of gas leak if a gas leak occurs. The third determining module is used to determine the location of the leak source of the leaking gas based on the solution model corresponding to the type of gas leak and the location of the gas sensing module.

10. A range hood, characterized in that, The range hood includes a gas sensing module and a control module, the gas sensing module being connected to the control module, and the control module being used to execute the control method of the range hood as described in any one of claims 1-8.

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