Method and system for monitoring the clogging status of a range hood filter

Abstract

The present invention relates to the technical field of range hood filter blockage monitoring, and specifically to a range hood filter blockage status monitoring method and system. The method obtains the position of a photosensitive element based on the position of an LED light source, and then obtains the blockage level demarcation point in the range hood filter; obtains the standard light intensity based on the distance between the blockage level demarcation point and the LED light source and the incident light at the blockage level demarcation point; obtains the current actual light intensity based on the distance between the photosensitive element and the blockage level demarcation point, the deviation of the incident light between the photosensitive element and the blockage level demarcation point, and the current light intensity detected by the photosensitive element; obtains the current blockage status of the range hood filter based on the difference between the current actual light intensity and the standard light intensity of the blockage level demarcation point, as well as the position. The present invention accurately obtains the current blockage status of the range hood filter by analyzing the current actual light intensity and position of the blockage level demarcation point, which is conducive to timely and accurate processing of the range hood filter blockage problem.

Description

Technical Field

[0001] The present invention relates to the technical field of range hood filter clogging monitoring, and in particular to a range hood filter clogging status monitoring method and system. Background Art

[0002] As a core appliance in modern kitchens, the range hood's function is to draw in cooking fumes, particulate matter, and other pollutants through a fan system and exhaust them outdoors, thus ensuring clean kitchen air. With technological advancements, range hoods have evolved from single-function systems to intelligent and integrated features, such as display screens, smart sensors, and networked controls. However, over time, the filter, its core component, can become clogged due to grease accumulation. This reduces the range hood's exhaust efficiency and increases fan resistance, further increasing the load on the motor and causing abnormally high operating noise. Furthermore, prolonged motor overload shortens the range hood's service life. Therefore, accurate monitoring of the range hood filter's clogging status is crucial for timely resolution.

[0003] In the existing method, the blockage status of the range hood filter is monitored by weighing detection method and wind pressure detection method. However, in actual situations, the detection results of the weighing detection method are easily affected by humidity, resulting in inaccurate monitoring of the blockage status of the range hood filter; and the wind pressure detection method has the problem of missing the blocked area in the range hood filter, and thus cannot accurately monitor the blockage status of the range hood filter; at the same time, the weighing detection method and the wind pressure detection method are only effective when the range hood filter is severely blocked, and cannot prevent and judge the early mild blockage of the range hood filter, which is not conducive to the long-term and stable operation of the range hood. Summary of the Invention

[0004] In order to solve the technical problem of inaccurate monitoring of the clogging status of the range hood filter, which affects the service life of the range hood, the purpose of the present invention is to provide a method and system for monitoring the clogging status of the range hood filter. The technical solutions adopted are as follows:

[0005] In a first aspect, an embodiment of the present invention provides a method for monitoring the clogging status of a range hood filter, the method comprising the following steps:

[0006] The position of the photosensor is obtained based on the position of the LED light source; the blockage level cutoff point in the range hood filter is obtained based on the positions of the LED light source and the photosensor; wherein the LED light source is located outside the range hood, and the photosensor is located inside the range hood, and the photosensor is used to obtain the light intensity of the LED light source passing through the range hood filter;

[0007] Obtain the standard light intensity of each congestion level cutoff point based on the distance between each congestion level cutoff point and the LED light source, the direction of the incident light at each congestion level cutoff point, and the initial light intensity of the LED light source;

[0008] Obtaining the current actual light intensity at each congestion level cutoff point based on the distance between each photosensitive element and each congestion level cutoff point, the deviation of the incident light between each photosensitive element and each congestion level cutoff point, and the current light intensity detected by each photosensitive element;

[0009] The current blockage status of the range hood filter is obtained based on the difference between the current actual light intensity and the standard light intensity at each blockage level dividing point and the position of each blockage level dividing point.

[0010] Furthermore, the method for obtaining the standard light intensity is:

[0011] For any congestion level demarcation point, the distance between the congestion level demarcation point and the corresponding position point of the LED light source is used as the first distance;

[0012] The line connecting the corresponding position point of the LED light source and the congestion level dividing point is used as the incident light of the congestion level dividing point;

[0013] The angle between the incident light and the perpendicular line of the surface where the range hood filter is located is used as the incident light deviation angle of the blockage level dividing point;

[0014] The standard light intensity of the blockage level dividing point is obtained based on the initial light intensity of the LED light source, the variance of the first distance and the cosine value of the deviation angle of the incident light; wherein, the initial light intensity and the cosine value of the deviation angle of the incident light are both positively correlated with the standard light intensity, and the variance of the first distance is negatively correlated with the standard light intensity.

[0015] Furthermore, the method for obtaining the current actual light intensity is:

[0016] For any congestion level demarcation point and any photosensitive element, obtaining the distance between the position point corresponding to the photosensitive element and the congestion level demarcation point as the second distance;

[0017] The line connecting the position point corresponding to the photosensitive element and the blockage level boundary point is used as the first connecting line;

[0018] The angle between the first connecting line and the incident light at the congestion level boundary point is taken as the first angle;

[0019] Normalizing the product of the cosine value of the first angle and the reciprocal of the square of the second distance, and using the result as the light intensity reflection weight of the photosensitive element for the blockage level cutoff point;

[0020] The product of the current light intensity detected by the photosensitive element and the light intensity reflection weight is used as the current light intensity reference value of the photosensitive element for the blockage level cutoff point;

[0021] The sum of the current light intensity reference values of all photosensitive elements at the blockage level dividing point is used as the current actual light intensity at the blockage level dividing point.

[0022] Furthermore, the method for obtaining the current blockage status of the range hood filter according to the difference between the current actual light intensity and the standard light intensity at each blockage level dividing point and the position of each blockage level dividing point is:

[0023] According to the difference between the current actual light intensity and the standard light intensity of each congestion level dividing point, the current congestion degree of each congestion level dividing point is obtained;

[0024] The current blockage status of the range hood filter is obtained based on the current blockage degree and position of each blockage level boundary point.

[0025] Furthermore, the method for obtaining the current congestion degree is:

[0026] The result of normalizing the difference between the standard light intensity and the current actual light intensity at each congestion level dividing point is used as the current congestion degree of each congestion level dividing point.

[0027] Furthermore, the method for obtaining the current blockage status of the range hood filter is:

[0028] The congestion level cutoff points are divided into level 1, level 2, level 3, and so on in ascending order, completing the level division of all congestion level cutoff points.

[0029] When the current congestion level is greater than the preset congestion level threshold, the corresponding congestion level cutoff point is used as the congestion analysis point;

[0030] Obtain the level corresponding to each blockage analysis point, and use the highest level as the current blockage status of the range hood filter.

[0031] Furthermore, the method for obtaining the current blockage state of the range hood filter further includes:

[0032] Get the average of the current blockage levels of all blockage analysis points as the current blockage status of the range hood filter.

[0033] Furthermore, the method for obtaining the position of the photosensitive element according to the position of the LED light source is:

[0034] The light emitted by the LED light source is irradiated through the range hood filter onto an inclined surface on the lower side of the flue inside the range hood as a reference surface, and the central axis with endpoints located at the upper and lower sides of the reference surface is obtained as a reference line;

[0035] For any endpoint of the reference line, the point on the reference line that is a specified distance away from the endpoint is used as the target point;

[0036] The local reference line formed by two target points on the reference line is divided into a preset number of segments, and the dividing points between the two target points are all used as target points;

[0037] The position of each target point is used as the position of each photosensitive element; when the line connecting the position point corresponding to the LED light source and the lowest target point exceeds the lower boundary point of the range hood filter, the intersection of the line connecting the position point corresponding to the LED light source and the lower boundary point of the range hood filter is extended to the reference line as the lowest target point.

[0038] Furthermore, the method for obtaining the blockage level cutoff point in the range hood filter according to the position of the LED light source and the photosensitive element is:

[0039] The points where the line segments connecting the corresponding position points of the LED light source and the corresponding target points of each photosensitive element pass through the range hood filter are used as the blockage level dividing points.

[0040] In the second aspect, another embodiment of the present invention provides a range hood filter clogging status monitoring system, the system comprising: a memory, a processor, and a computer program stored in the memory and running on the processor, when the processor executes the computer program, it implements the steps of any one of the above methods.

[0041] The present invention has the following beneficial effects:

[0042] The present invention first obtains the position of the photosensitive element according to the position of the LED light source, which is beneficial to comprehensively monitoring the blockage condition of the range hood filter; in order to accurately and efficiently monitor the blockage condition of the range hood filter, the blockage level dividing point in the range hood filter is obtained according to the position of the LED light source and the photosensitive element, which is beneficial to the subsequent accurate analysis of the blockage condition of the range hood filter through light transmittance; in order to accurately analyze the current blockage condition of the range hood filter, the standard light intensity of each blockage level dividing point is first obtained according to the distance between each blockage level dividing point and the LED light source, the direction of the incident light at each blockage level dividing point, and the initial light intensity of the LED light source, accurately reflecting the light intensity of each blockage level dividing point itself without considering the blockage; then according to the distance between each photosensitive element and each blockage level dividing point, the direction of the incident light at each photosensitive element and each blockage level dividing point The deviation situation and the current light intensity detected by each photosensitive element are used to obtain the current actual light intensity of each blockage level dividing point, which accurately reflects the actual light intensity passing through each blockage level dividing point at the current time, which is conducive to the subsequent accurate analysis of the current blockage situation of each blockage level dividing point; and then according to the difference between the current actual light intensity and the standard light intensity of each blockage level dividing point, as well as the position of each blockage level dividing point, the current blockage status of the range hood filter is accurately obtained, and the current blockage situation of the range hood filter is accurately determined, which is conducive to providing users with more reliable range hood filter blockage status information, and timely reminding users to clean and maintain the range hood filter to avoid further deterioration of the range hood filter blockage. At the same time, it can avoid the overload of the range hood motor, reduce motor loss, improve the operating efficiency and reliability of the range hood, and effectively extend the service life of the range hood. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions and advantages of the embodiments of the present invention or the prior art, the following briefly introduces the drawings required for use in the embodiments or the prior art descriptions. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0044] Figure 1 A schematic flow chart of a method for monitoring the clogging status of a range hood filter provided by one embodiment of the present invention;

[0045] Figure 2 A front view of corresponding positions of an LED light source and a photosensitive element provided by one embodiment of the present invention;

[0046] Figure 3 A schematic diagram of a closed state of a photosensitive protection module provided by one embodiment of the present invention;

[0047] Figure 4 A schematic diagram of an open state of a photosensitive protection module provided by an embodiment of the present invention;

[0048] Figure 5 A schematic diagram of the amount of projected light corresponding to different incident angles of light from an LED light source provided by one embodiment of the present invention;

[0049] Figure 6 A flow chart of a method for obtaining current actual light intensity provided by one embodiment of the present invention;

[0050] Figure 7 A structural diagram of a range hood filter clogging status monitoring system provided by one embodiment of the present invention;

[0051] Figure 8 A schematic diagram of a computer device provided by one embodiment of the present invention. DETAILED DESCRIPTION

[0052] To further illustrate the technical means and effectiveness of the present invention in achieving its intended purpose, the following, in conjunction with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, features, and effectiveness of a range hood filter clogging status monitoring method and system proposed by the present invention. In the following description, references to "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics of one or more embodiments may be combined in any suitable manner.

[0053] Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs.

[0054] The following describes in detail a method and system for monitoring the clogging status of a range hood filter provided by the present invention with reference to the accompanying drawings.

[0055] Example 1:

[0056] The specific scenario of this embodiment is: in order to avoid serious clogging of the range hood filter, which leads to a decrease in the range hood exhaust efficiency and an increase in the fan resistance, and further leads to the problem of increased motor load, increased operating noise and shortened service life of the range hood, the existing method proposes a timed reminder method, a weighing detection method and a wind pressure detection method to deal with the clogging problem of the range hood filter. Among them, the timed reminder method does not take into account the difference in the frequency of users' actual use of the range hood and the degree of oil accumulation in the range hood, resulting in inaccurate reminders; the detection results of the weighing detection method are easily affected by humidity, resulting in inaccurate monitoring of the clogging status of the range hood filter, and further inaccurate treatment of the clogging of the range hood filter; the wind pressure detection method has the problem of missing the clogged area in the range hood filter, and thus cannot accurately monitor the clogging status of the range hood filter, which also leads to inaccurate treatment of the clogging of the range hood filter. To accurately monitor and address the clogged state of a range hood filter, thereby extending the lifespan of the range hood, this embodiment utilizes the principle that the light transmittance of a range hood varies with the degree of filter clog. This method uses the measured values of a photosensor at different locations to analyze the light transmittance of the range hood filter, thereby determining the clogged state. This range hood filter clog monitoring method is unaffected by humidity and more accurately reflects the clogged state of different areas of the range hood filter. This provides more accurate monitoring of the clogged state of the range hood filter, prompting users to promptly clean and maintain the range hood filter, effectively extending the lifespan of the range hood.

[0057] The present invention proposes a method for monitoring the clogging status of a range hood filter. Figure 1 , which shows a schematic flow chart of a method for monitoring the clogging status of a range hood filter provided by one embodiment of the present invention, the method comprising the following steps:

[0058] Step S1: Obtain the position of the photosensitive element according to the position of the LED light source; obtain the blockage level dividing point in the range hood filter according to the positions of the LED light source and the photosensitive element; wherein, the LED light source is located outside the range hood, and the photosensitive element is located inside the range hood, and the photosensitive element is used to obtain the light intensity of the LED light source passing through the range hood filter.

[0059] Specifically, in actual situations, different models and specifications of range hoods have different filter layouts. For example, some range hoods have four filters arranged in a quadrangular pyramid shape, while others have only one filter. This embodiment analyzes each filter individually, so monitoring the filter clogging status of range hoods of different models and specifications is applicable to this embodiment. To clarify the description of this embodiment, the default scenario in this embodiment is to analyze only one range hood filter.

[0060] To analyze the clogged condition of the range hood filter, this embodiment places an LED light source outside the range hood and a photosensor inside. The photosensor detects the intensity of light from the LED light source passing through the range hood filter. The light intensity detected by the photosensor is transmitted wirelessly or via a wired connection to the range hood control system, which then analyzes the acquired light intensity data to determine the degree of filter clog.

[0061] When the user turns off the range hood, the range hood filter blockage detection program will be automatically triggered. First, the LED light source will be started. It should be noted that the LED light source is set on an automatically foldable bracket. When the range hood filter blockage detection program is started, the automatically foldable bracket where the LED light source is located will automatically extend out, so that the LED light source and the range hood filter maintain a certain vertical distance to ensure that the light of the LED light source can evenly cover the entire range hood filter. At the same time, the irradiation center of the LED light source is the center of the range hood filter, so that the light of the LED light source can more comprehensively irradiate the surface of the range hood filter. This embodiment sets the vertical distance to 15 cm. The implementer can set the size of the vertical distance according to actual conditions, and there is no limitation here. When the range hood filter blockage detection program ends, the LED light source is turned off and the automatically foldable bracket where it is located will automatically retract. If the range hood itself has a suitable place to install the LED light source, there is no need to install an automatically foldable bracket in the range hood.

[0062] To accurately and comprehensively monitor the range hood filter clogging status, this embodiment requires determining the position of the photosensor based on the range hood design and the position of the LED light source. In one implementation of this embodiment, the position of the photosensor is determined by transmitting light from the LED light source through the range hood filter onto an inclined surface below the range hood's internal flue, serving as a reference surface. The reference surface and the surface of the range hood filter are assumed to be parallel. A reference line is obtained, with endpoints located at the midpoints of the upper and lower edges of the reference surface. To comprehensively monitor the filter clogging status, for each endpoint of the reference line, a point a specified distance from the endpoint is designated as a target point. In this embodiment, the designated length is set to 3 centimeters; however, the user can adjust the length based on actual needs and is not a limitation. The local reference line formed by two target points on the reference line is divided into a predetermined number of segments, with each segment between the two target points also designated as a target point. In this embodiment, the predetermined number is set to 3; however, the user can adjust the predetermined number based on actual needs and is not a limitation. Therefore, there are two dividing points in total, that is, there are four target points in total in this embodiment. The position of each target point is used as the position of each photosensitive element. Among them, when the line connecting the corresponding position point of the LED light source and the lowest target point exceeds the lower boundary point of the range hood filter, it means that the light of the LED light source cannot be projected onto the lowest target point. At this time, this embodiment uses the intersection of the line connecting the corresponding position point of the LED light source and the lower boundary point of the range hood filter on the reference line as the lowest target point. It should be noted that the lower boundary point of the range hood filter in this embodiment is the midpoint of the lower boundary edge of the range hood filter. This embodiment marks the four target points as S4, S3, S2 and S1 from top to bottom. As shown Figure 2 The figure shows the main view of the corresponding position points of the LED light source and the photosensitive element. Figure 2 The model of the medium-sized range hood has four filters. This embodiment takes the filter on the left side of the range hood as an example for analysis.

[0063] In order to prevent the oil from interfering with the photosensitivity of the photosensitive element, this embodiment sets a photosensitive protection module for each photosensitive element. The photosensitive protection module is a movable mechanical structure that is responsible for protecting the photosensitive element from being interfered with by the oil, thereby improving the accuracy of monitoring the clogging status of the range hood filter. When the range hood filter is not being monitored for clogging, the photosensitive protection module is in a closed state. Figure 3 The photosensitive protection module is shown as a schematic diagram of the closed state, which protects the photosensitive element from interference from oil pollution; in the process of monitoring the blockage status of the range hood filter, the photosensitive protection module is turned on through the range hood control system, such as Figure 4 Shown is a schematic diagram of the photosensitive protection module in the open state.

[0064] To accurately and efficiently analyze the clogging status of the range hood filter, this embodiment uses the points where the line connecting the position point corresponding to the LED light source and the target point corresponding to each photosensitive element passes through the range hood filter as the clogging level cutoff points. By analyzing the light intensity transmitted through each clogging level cutoff point, the clogging status of the range hood filter is indirectly reflected. Because the range hood filter has a certain inclination angle in real space, the closer to the bottom of the range hood filter, the more serious the oil smoke accumulation. The clogging level cutoff points are distributed vertically on the range hood filter. Therefore, the degree of clogging of the range hood filter can be analyzed by the light transmission at each clogging level cutoff point. Considering that the range hood filter and the reference surface are almost parallel, the photosensitive elements are all on the central axis of the reference surface, and the center point of the LED light source's illumination is the center point of the range hood filter, this embodiment places the clogging level cutoff points on the central axis of the range hood filter, so that the clogging status of the range hood filter is more accurately reflected.

[0065] Step S2: Obtain the standard light intensity of each congestion level demarcation point according to the distance between each congestion level demarcation point and the LED light source, the direction of the incident light at each congestion level demarcation point, and the initial light intensity of the LED light source.

[0066] Specifically, due to the structure of the range hood itself, the irradiation angles of the LED light source and the range hood filter at different positions are different, which leads to differences in the intensity of light passing through different positions of the range hood filter. For example, taking a circular filter hole as an example, when the light is irradiated vertically on the filter, the maximum amount of light passing through the filter hole is equal to the total area of the circular filter hole; when the light is irradiated on the filter at an angle, the greater the angle of inclination, the smaller the amount of light passing through the filter hole, which is the elliptical area after the incident angle of the inclined light is tilted, such as Figure 5 The figure shows the amount of projected light corresponding to different incident angles of the LED light source. Therefore, this embodiment first preliminarily analyzes the standard light intensity corresponding to each congestion level cutoff point based on the incident light direction at each congestion level cutoff point. Considering that the light intensity of the LED light source decreases with increasing distance, this embodiment determines the standard light intensity for each congestion level cutoff point based on the distance between each congestion level cutoff point and the LED light source, the incident light direction at each congestion level cutoff point, and the initial light intensity of the LED light source. A higher standard light intensity indicates a higher light intensity at the corresponding congestion level cutoff point.

[0067] Preferably, in a manner that can be implemented in this embodiment, the method for obtaining the standard light intensity is: for any blockage level dividing point, the Euclidean distance between the blockage level dividing point and the position point corresponding to the LED light source is used as the first distance; the larger the first distance, the smaller the light intensity of the LED light source at the blockage level dividing point. Among them, the method for obtaining the Euclidean distance is a well-known technology and will not be described in detail. In order to determine the incident angle of the LED light source corresponding to the blockage level dividing point, the line connecting the position point corresponding to the LED light source and the blockage level dividing point is used as the incident light of the blockage level dividing point; then the angle between the incident light and the perpendicular line of the surface where the range hood filter is located is used as the incident light deviation angle of the blockage level dividing point; the larger the incident light deviation angle, the larger the inclination angle of the light of the LED light source passing through the blockage level dividing point, and the smaller the light intensity of the LED light source at the blockage level dividing point. It should be noted that the value range of the incident light deviation angle is 0° to 90°. In order to determine the standard light intensity corresponding to the congestion level dividing point itself, this embodiment obtains the standard light intensity of the congestion level dividing point based on the initial light intensity of the LED light source, the variance of the first distance and the cosine value of the deviation angle of the incident light; wherein, the initial light intensity and the cosine value of the deviation angle of the incident light are both positively correlated with the standard light intensity, and the variance of the first distance is negatively correlated with the standard light intensity.

[0068] The calculation formula for standard light intensity is: Where S a is the standard light intensity of the ath blockage level dividing point; I0 is the initial light intensity of the LED light source; d a is the first distance corresponding to the ath congestion level cutoff point; θ a is the incident light deviation angle at the ath blockage level cutoff point; cos is the cosine function. It should be noted that the initial light intensity of the LED light source is known.

[0069] At this point, the standard light intensity at each blockage level cutoff point is obtained.

[0070] Step S3: Obtain the current actual light intensity of each congestion level dividing point based on the distance between each photosensitive element and each congestion level dividing point, the deviation of the incident light between each photosensitive element and each congestion level dividing point, and the current light intensity detected by each photosensitive element.

[0071] It is known that LED light sources are diffuse reflection light sources. Therefore, the light passing through each blockage level dividing point will have different degrees of response on each photosensitive element. In order to accurately obtain the current actual light intensity corresponding to each blockage level dividing point during the current monitoring, and then accurately analyze the current blockage status of the range hood filter, this embodiment obtains the current actual light intensity of each blockage level dividing point based on the distance between each photosensitive element and each blockage level dividing point, the deviation of the incident light between each photosensitive element and each blockage level dividing point, and the current light intensity detected by each photosensitive element.

[0072] Preferably, in one possible implementation of this embodiment, the method for obtaining the current actual light intensity is as follows: Figure 6 , which shows a flow chart of a method for obtaining the current actual light intensity provided by this embodiment, the method comprising the following steps:

[0073] Step S301: Obtain light intensity reflection weight.

[0074] For any congestion level cutoff point and any photosensitive element, the closer the photosensitive element is to the congestion level cutoff point, and the closer the photosensitive element's location is to the incident light at the congestion level cutoff point, the greater the degree of reflection of the light passing through the congestion level cutoff point on the photosensitive element should be, and the greater the degree of participation of the light intensity detected by the photosensitive element in analyzing the transmittance of the congestion level cutoff point. Furthermore, this embodiment obtains the light intensity reflection weight of each photosensitive element for each congestion level cutoff point based on the distance between each photosensitive element and each congestion level cutoff point, as well as the deviation of each photosensitive element from the incident light at each congestion level cutoff point. The greater the light intensity reflection weight, the greater the degree to which the light intensity detected by the corresponding photosensitive element can be used as a reference when analyzing the transmittance of the corresponding congestion level cutoff point.

[0075] In one possible implementation of this embodiment, the light intensity reflection weight is obtained as follows: for any congestion level demarcation point and any photosensitive element, the Euclidean distance between the position point corresponding to the photosensitive element and the congestion level demarcation point is obtained as the second distance; the larger the second distance is, the weaker the response of the photosensitive element to the LED light source light passing through the congestion level demarcation point is; at the same time, when the incident light of the congestion level demarcation point deviates more from the position of the photosensitive element, it also means that the response of the photosensitive element to the LED light source light passing through the congestion level demarcation point is weaker, and thus, in this embodiment, the line connecting the position point corresponding to the photosensitive element and the congestion level demarcation point is used as the first line; the first line is connected to the incident light of the congestion level demarcation point. The angle of the incident light is used as the first angle; the first angle accurately reflects the degree of deviation of the photosensitive element from the blockage level dividing point. When the first angle is larger, the more the photosensitive element deviates from the direction of the incident light at the blockage level dividing point, and the weaker the response of the photosensitive element to the LED light source light passing through the blockage level dividing point. In order to determine the light intensity reference of the photosensitive element for the blockage level dividing point, the product of the cosine value of the first angle and the reciprocal of the square of the second distance is normalized as the light intensity reflection weight of the photosensitive element for the blockage level dividing point. In this embodiment, the product of the cosine value of the first angle and the reciprocal of the square of the second distance is normalized by the norm normalization function.

[0076] At this point, the light intensity reflection weight of each photosensitive element for each blockage level boundary point is obtained.

[0077] Step S302: Obtain the current light intensity reference value.

[0078] When the light intensity reflection weight of a photosensitive element to a certain congestion level dividing point is greater, the current light intensity detected by the photosensitive element participates more in reflecting the transmittance of the congestion level dividing point, and then the product of the current light intensity detected by the photosensitive element and its corresponding light intensity reflection weight is used as the current light intensity reference value of the photosensitive element for the congestion level dividing point.

[0079] At this point, the current light intensity reference value of each photosensitive element for each blockage level cutoff point is obtained.

[0080] Step S303: Obtain the current actual light intensity.

[0081] To determine the current actual light intensity at each blockage level cutoff point and accurately analyze the current blockage level of the range hood filter, this embodiment adds the current light intensity reference values of all photosensors at each blockage level cutoff point to determine the current actual light intensity at that blockage level cutoff point. The lower the current actual light intensity, the more severe the filter blockage at that blockage level cutoff point.

[0082] At this point, the current actual light intensity of each congestion level cutoff point is obtained.

[0083] Step S4: obtaining the current blockage status of the range hood filter according to the difference between the current actual light intensity and the standard light intensity of each blockage level dividing point and the position of each blockage level dividing point.

[0084] Specifically, the greater the difference between the current actual light intensity and the standard light intensity at a blockage level cutoff point, the more likely that blockage exists at that blockage level cutoff point. This embodiment then determines the current blockage degree of each blockage level cutoff point based on the difference between the current actual light intensity and the standard light intensity at each blockage level cutoff point, thereby determining the blockage level cutoff point at which blockage currently exists. Considering that oil stains from a range hood tend to be more concentrated on the lower side of the filter, the greater the current blockage degree at the higher blockage level cutoff points, the larger the blockage area of the current range hood filter, indirectly indicating that the current blockage state of the range hood filter is more serious.

[0085] In one possible implementation of this embodiment, the current congestion level is obtained by normalizing the difference between the standard light intensity and the current actual light intensity at each congestion level cutoff point to obtain the current congestion level at each congestion level cutoff point. This embodiment uses the norm normalization function to normalize the difference between the standard light intensity and the current actual light intensity at each congestion level cutoff point.

[0086] It is known that the greater the current blockage degree, the more likely the corresponding blockage level demarcation point and the range hood filter area below it are to be clogged, and thus this embodiment sets the preset blockage level threshold value to 0.7. The implementer can set the size of the preset blockage level threshold value according to the actual situation, and there is no limitation here. When the current blockage degree is greater than the preset blockage level threshold value, the corresponding blockage level demarcation point is used as the blockage analysis point. Taking into account the different blockage conditions of the range hood filter corresponding to different blockage level demarcation points, this embodiment divides the blockage level demarcation points in order from bottom to top, and divides the first blockage level demarcation point into level 1, the second blockage level demarcation point into level 2, the third blockage level demarcation point into level 3, and so on, to complete the level division of all blockage level demarcation points. It is known that there are 4 target points in this embodiment, and thus there are 4 blockage level demarcation points in this embodiment, that is, there are 4 levels in total; then the level corresponding to each blockage analysis point is obtained, and the highest level is used as the current blockage state of the range hood filter.

[0087] The greater the current blockage degree of the blockage analysis point, the more serious the current blockage state of the range hood filter. Therefore, in another achievable method of this embodiment, the average of the current blockage degrees of all blockage analysis points is obtained as the current blockage state of the range hood filter.

[0088] After the range hood filter blockage detection program is completed, the current blockage status of the range hood filter is displayed on the range hood control panel. When the current blockage status of the range hood filter is the preset first designated level, or is greater than the preset first blockage analysis threshold and less than or equal to the preset second blockage analysis threshold, the range hood emits a buzzer alarm and, when the user subsequently uses the range hood, prompts the user that the range hood filter needs cleaning and maintenance. When the current blockage status of the range hood filter is the preset second designated level, or is greater than the preset second blockage analysis threshold, the range hood control system automatically limits the fan to the highest gear to protect the motor, avoid overloading the range hood motor, and extend the service life of the range hood. In this embodiment, the preset first designated level is set to level 3, the preset second designated level is set to level 4, the preset first blockage analysis threshold is set to 0.5, and the preset second blockage analysis threshold is set to 0.7. The implementer can set the preset first designated level, preset second designated level, preset first blockage analysis threshold, and preset second blockage analysis threshold according to actual conditions, and there is no limitation here.

[0089] At this point, accurate monitoring of the current blockage status of the range hood filter is beneficial to providing users with more reliable range hood filter blockage status information, and timely reminding users to clean and maintain the range hood filter to avoid further deterioration of the range hood filter blockage. At the same time, it avoids the overload of the range hood motor, reduces motor loss, improves the operating efficiency and reliability of the range hood, and effectively extends the service life of the range hood.

[0090] In summary, this embodiment obtains the position of the photosensitive element based on the position of the LED light source, and thus obtains the blockage level cutoff point in the range hood filter; obtains the standard light intensity based on the distance between the blockage level cutoff point and the LED light source and the incident light at the blockage level cutoff point; obtains the current actual light intensity based on the distance between the photosensitive element and the blockage level cutoff point, the deviation of the photosensitive element from the incident light at the blockage level cutoff point, and the current light intensity detected by the photosensitive element; and obtains the current blockage state of the range hood filter based on the difference between the current actual light intensity and the standard light intensity, as well as the position of the blockage level cutoff point. The present invention accurately obtains the current blockage state of the range hood filter by analyzing the current actual light intensity and position of the blockage level cutoff point, which is conducive to timely and accurate treatment of range hood filter blockage problems.

[0091] Example 2:

[0092] The present invention also proposes a range hood filter clogging status monitoring system, please refer to Figure 7, which shows a structural diagram of a range hood filter clogging status monitoring system provided by an embodiment of the present invention. The system includes: a clogging level demarcation point acquisition module 10, a standard light intensity acquisition module 20, a current actual light intensity acquisition module 30 and a range hood filter clogging status analysis module 40.

[0093] The blockage level demarcation point acquisition module 10 is used to obtain the position of the photosensitive element according to the position of the LED light source; and obtain the blockage level demarcation point in the range hood filter according to the positions of the LED light source and the photosensitive element; wherein, the LED light source is located outside the range hood, and the photosensitive element is located inside the range hood, and the photosensitive element is used to obtain the light intensity of the LED light source passing through the range hood filter.

[0094] The standard light intensity acquisition module 20 is used to acquire the standard light intensity of each congestion level demarcation point according to the distance between each congestion level demarcation point and the LED light source, the direction of the incident light at each congestion level demarcation point, and the initial light intensity of the LED light source.

[0095] The current actual light intensity acquisition module 30 is used to obtain the current actual light intensity of each congestion level dividing point based on the distance between each photosensitive element and each congestion level dividing point, the deviation of the incident light between each photosensitive element and each congestion level dividing point, and the current light intensity detected by each photosensitive element.

[0096] The range hood filter clogging state analysis module 40 is used to obtain the current clogging state of the range hood filter according to the difference between the current actual light intensity and the standard light intensity of each clogging level dividing point and the position of each clogging level dividing point.

[0097] It should be noted that the system provided in the above embodiment is merely an example of the division of the functional modules described above. In actual applications, the above functions can be assigned to different functional modules as needed, that is, the internal structure of the computer device can be divided into different functional modules to complete all or part of the functions described above. In addition, the range hood filter clogging status monitoring system and the range hood filter clogging status monitoring method provided in the above embodiment are based on the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0098] Example 3:

[0099] The present invention also provides a device for monitoring the clogged state of a range hood filter. The device comprises a memory and a processor. The memory stores executable program code, and the processor is configured to call and execute the executable program code to implement a range hood filter clogged state monitoring method provided in an embodiment of the present application. The device can be a chip, component, or module. The chip may include a processor and memory connected together. The memory is configured to store instructions. When the processor calls and executes the instructions, the chip executes the range hood filter clogged state monitoring method provided in the above embodiment.

[0100] In addition, the present invention also protects a computer device, see Figure 8 The computer device includes a memory 401, a processor 402, and a computer program 403 stored in the memory 401 and running on the processor 402, wherein when the processor 402 executes the computer program 403, the computer device can execute any of the range hood filter clogging status monitoring methods introduced above.

[0101] Example 4:

[0102] The present invention also provides a computer-readable storage medium, which stores computer program code. When the computer program code runs on a computer, the computer executes the above-mentioned related method steps to implement a range hood filter clogging status monitoring method provided in the above embodiment.

[0103] Example 5:

[0104] The present invention also provides a computer program product. When the computer program product is run on a computer, the computer is caused to execute the above-mentioned related steps to implement a range hood filter clogging status monitoring method provided in the above embodiment.

[0105] Among them, the device, computer-readable storage medium, computer program product or chip provided in this embodiment are all used to execute the corresponding methods provided above. Therefore, the beneficial effects that can be achieved can refer to the beneficial effects in the corresponding methods provided above, and will not be repeated here.

[0106] It should be noted that the order in which the embodiments of the present invention are described above is for illustrative purposes only and does not necessarily represent the superiority or inferiority of the embodiments. The processes depicted in the accompanying drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0107] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to each other. Each embodiment focuses on the differences from other embodiments.

Claims

1. A method for monitoring the clogging status of a range hood filter, characterized in that: The method comprises the following steps: The position of the photosensor is obtained based on the position of the LED light source; the blockage level cutoff point in the range hood filter is obtained based on the positions of the LED light source and the photosensor; wherein the LED light source is located outside the range hood, and the photosensor is located inside the range hood, and the photosensor is used to obtain the light intensity of the LED light source passing through the range hood filter; Obtain the standard light intensity of each congestion level cutoff point based on the distance between each congestion level cutoff point and the LED light source, the direction of the incident light at each congestion level cutoff point, and the initial light intensity of the LED light source; Obtaining the current actual light intensity at each congestion level cutoff point based on the distance between each photosensitive element and each congestion level cutoff point, the deviation of the incident light between each photosensitive element and each congestion level cutoff point, and the current light intensity detected by each photosensitive element; The current blockage status of the range hood filter is obtained based on the difference between the current actual light intensity and the standard light intensity at each blockage level dividing point, as well as the position of each blockage level dividing point; The method for obtaining the standard light intensity is: For any congestion level demarcation point, the distance between the congestion level demarcation point and the corresponding position point of the LED light source is used as the first distance; The line connecting the corresponding position point of the LED light source and the congestion level dividing point is used as the incident light of the congestion level dividing point; The angle between the incident light and the perpendicular line of the surface where the range hood filter is located is used as the incident light deviation angle of the blockage level dividing point; Obtaining a standard light intensity at the congestion level cutoff point based on the initial light intensity of the LED light source, the variance of the first distance, and the cosine value of the deviation angle of the incident light; wherein the initial light intensity and the cosine value of the deviation angle of the incident light are both positively correlated with the standard light intensity, and the variance of the first distance is negatively correlated with the standard light intensity; The method for obtaining the current actual light intensity is: For any congestion level demarcation point and any photosensitive element, obtaining the distance between the position point corresponding to the photosensitive element and the congestion level demarcation point as the second distance; The line connecting the position point corresponding to the photosensitive element and the blockage level boundary point is used as the first connecting line; The angle between the first connecting line and the incident light at the congestion level boundary point is taken as the first angle; Normalizing the product of the cosine value of the first included angle and the reciprocal of the square of the second distance, and using the result as the light intensity reflection weight of the photosensitive element for the blockage level cutoff point; The product of the current light intensity detected by the photosensitive element and the light intensity reflection weight is used as the current light intensity reference value of the photosensitive element for the blockage level cutoff point; The sum of the current light intensity reference values of all photosensitive elements at the blockage level dividing point is used as the current actual light intensity at the blockage level dividing point.

2. The method for monitoring the clogging status of a range hood filter according to claim 1, wherein: The method for obtaining the current blockage status of the range hood filter based on the difference between the current actual light intensity and the standard light intensity at each blockage level dividing point and the position of each blockage level dividing point is as follows: According to the difference between the current actual light intensity and the standard light intensity of each congestion level dividing point, the current congestion degree of each congestion level dividing point is obtained; The current blockage status of the range hood filter is obtained based on the current blockage degree and position of each blockage level boundary point.

3. The method for monitoring the clogging status of a range hood filter according to claim 2, wherein: The method for obtaining the current congestion degree is: The result of normalizing the difference between the standard light intensity and the current actual light intensity at each congestion level dividing point is used as the current congestion degree of each congestion level dividing point.

4. The method for monitoring the clogging status of a range hood filter according to claim 2, wherein: The method for obtaining the current blockage status of the range hood filter is: The congestion level cutoff points are divided into level 1, level 2, level 3, and so on in ascending order, completing the level division of all congestion level cutoff points. When the current congestion level is greater than the preset congestion level threshold, the corresponding congestion level cutoff point is used as the congestion analysis point; Obtain the level corresponding to each blockage analysis point, and use the highest level as the current blockage status of the range hood filter.

5. The method for monitoring the clogging status of a range hood filter according to claim 4, wherein: The method for obtaining the current blockage status of the range hood filter further includes: Get the average of the current blockage levels of all blockage analysis points as the current blockage status of the range hood filter.

6. The method for monitoring the clogging status of a range hood filter according to claim 1, wherein: The method for obtaining the position of the photosensitive element according to the position of the LED light source is: The light emitted by the LED light source is irradiated through the range hood filter onto an inclined surface on the lower side of the flue inside the range hood as a reference surface, and the central axis with endpoints located at the upper and lower sides of the reference surface is obtained as a reference line; For any endpoint of the reference line, the point on the reference line that is a specified distance away from the endpoint is used as the target point; The local reference line formed by two target points on the reference line is divided into a preset number of segments, and the dividing points between the two target points are all used as target points; The position of each target point is used as the position of each photosensitive element; when the line connecting the position point corresponding to the LED light source and the lowest target point exceeds the lower boundary point of the range hood filter, the intersection of the line connecting the position point corresponding to the LED light source and the lower boundary point of the range hood filter is extended to the reference line as the lowest target point.

7. A range hood filter clogging status monitoring method according to claim 6, characterized in that: The method for obtaining the blockage level cutoff point in the range hood filter according to the position of the LED light source and the photosensitive element is as follows: The points where the line segments connecting the corresponding position points of the LED light source and the corresponding target points of each photosensitive element pass through the range hood filter are used as the blockage level dividing points.

8. A range hood filter clogging status monitoring system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When executing the computer program, the processor implements the steps of the method for monitoring the clogging status of a range hood filter as described in any one of claims 1 to 7.

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