Range hood filter screen blocking state monitoring method and system

Abstract

The invention relates to the technical field of range hood filter screen blockage monitoring, in particular to a range hood filter screen blockage state monitoring method and system. The method comprises the steps that the position of a photosensitive element is obtained according to the position of an LED light source, and then blockage grade dividing points in a filter screen of the range hood are obtained; obtaining standard light intensity according to the distance between the blocking grade dividing point and the LED light source and the incident light of the blocking grade dividing point; according to the distance between the photosensitive element and the blockage grade dividing point, the deviation condition of the incident light of the photosensitive element and the blockage grade dividing point and the current light intensity detected by the photosensitive element, the current actual light intensity is obtained; and according to the difference between the current actual light intensity and the standard light intensity of the blocking grade dividing point and the position, the current blocking state of the range hood filter screen is obtained. By analyzing the current actual light intensity and position of the blocking grade demarcation point, the current blocking state of the filter screen of the range hood is accurately obtained, and the blocking problem of the filter screen of the range hood can be timely and accurately solved.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring the clogging of an oil fume filter, and specifically relates to a method and system for monitoring the clogging state of an oil fume filter. Background Art

[0002] As a core device in a modern kitchen, the function of an oil fume machine is to inhale and discharge pollutants such as oil fume and particulate matter generated during cooking outdoors through a fan system, thereby ensuring the cleanliness of the kitchen air. With the development of technology, oil fume machines have evolved from single-function to intelligent and integrated directions. For example, they are equipped with functions such as display screens, intelligent sensors, and networked control. However, the core component, the filter screen, will be clogged due to the accumulation of oil stains during long-term use, resulting in a decrease in the smoke exhaust efficiency of the oil fume machine and an increase in the resistance of the fan. As a result, the motor load of the oil fume machine increases and the operating noise abnormally rises. At the same time, the long-term overload operation of the motor will shorten the service life of the oil fume machine. Therefore, it is necessary to accurately monitor the clogging state of the oil fume filter to timely handle the clogging problem of the oil fume filter.

[0003] In existing methods, the clogging state of the oil fume filter is monitored by a weighing detection method and a wind pressure detection method. However, in actual situations, the detection results of the weighing detection method are easily interfered by humidity, resulting in inaccurate monitoring of the clogging state of the oil fume filter. The wind pressure detection method has a situation of missing detection of the clogged area in the oil fume filter, and thus cannot accurately monitor the clogging state of the oil fume filter. At the same time, both the weighing detection method and the wind pressure detection method have better effects only when the oil fume filter is severely clogged, and cannot prevent and judge the early mild clogging of the oil fume filter, which is not conducive to the long-term and stable operation of the oil fume machine. Summary of the Invention

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

[0005] In a first aspect, an embodiment of the present invention provides a method for monitoring the clogging state of an oil fume filter. The method includes the following steps:

[0006] Obtain the position of a photosensitive element according to the position of an LED light source; obtain the clogging level demarcation point in the oil fume filter according to the positions of the LED light source and the photosensitive element. Among them, the LED light source is located outside the oil fume machine, and the photosensitive element is located inside the oil fume machine. The photosensitive element is used to obtain the light intensity of the LED light source passing through the oil fume filter.

[0007] Obtain the standard light intensity of each clogging level demarcation point according to the distance between each clogging level demarcation point and the LED light source, the incident light direction of each clogging level demarcation point, and the initial light intensity of the LED light source;

[0008] Obtain the current actual light intensity of each clogging level demarcation point according to the distance between each photosensitive element and each clogging level demarcation point, the deviation of the incident light of each photosensitive element from each clogging level demarcation point, and the current light intensity detected by each photosensitive element;

[0009] 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 demarcation point, and the position of each clogging level demarcation point.

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

[0011] For any clogging level demarcation point, take the distance between this clogging level demarcation point and the corresponding position point of the LED light source as the first distance;

[0012] Take the line connecting the corresponding position point of the LED light source and this clogging level demarcation point as the incident light of this clogging level demarcation point;

[0013] Take the angle between the incident light and the perpendicular line of the surface where the range hood filter is located as the incident light deviation angle of this clogging level demarcation point;

[0014] Obtain the standard light intensity of this clogging level demarcation point according to the initial light intensity of the LED light source, the variance of the first distance, and the cosine value of the incident light deviation angle; among them, both the initial light intensity and the cosine value of the incident light deviation angle are 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 as follows:

[0016] For any clogging level demarcation point and any photosensitive element, obtain the distance between the corresponding position point of this photosensitive element and this clogging level demarcation point as the second distance;

[0017] Take the line connecting the corresponding position point of this photosensitive element and this clogging level demarcation point as the first connection line;

[0018] Take the angle between the first connection line and the incident light of this clogging level demarcation point as the first angle;

[0019] Take the normalized result of the product of the cosine value of the first angle and the reciprocal of the square of the second distance as the light intensity reflection weight of this photosensitive element for this clogging level demarcation point;

[0020] Multiply the current light intensity detected by the photosensitive element by the weight reflected by the light intensity, and use the result as the current light intensity reference value of the photosensitive element for the clogging level demarcation point;

[0021] Add up the current light intensity reference values of all photosensitive elements for the clogging level demarcation point, and use the result as the current actual light intensity of the clogging level demarcation point.

[0022] Further, the method for obtaining 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 demarcation point, and the position of each clogging level demarcation point is as follows:

[0023] Obtain the current clogging degree of each clogging level demarcation point according to the difference between the current actual light intensity and the standard light intensity of each clogging level demarcation point;

[0024] Obtain the current clogging state of the range hood filter according to the current clogging degree and position of each clogging level demarcation point.

[0025] Further, the method for obtaining the current clogging degree is as follows:

[0026] Use the result of normalizing the difference between the standard light intensity and the current actual light intensity of each clogging level demarcation point as the current clogging degree of each clogging level demarcation point.

[0027] Further, the method for obtaining the current clogging state of the range hood filter is as follows:

[0028] Arrange the clogging level demarcation points in ascending order from bottom to top. Divide the first clogging level demarcation point into level 1, the second clogging level demarcation point into level 2, the third clogging level demarcation point into level 3, and so on, to complete the level division of all clogging level demarcation points;

[0029] When the current clogging degree is greater than the preset clogging degree threshold, use the corresponding clogging level demarcation point as the clogging analysis point;

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

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

[0032] Obtain the average value of the current clogging degrees of all clogging analysis points, and use it as the current clogging state of the range hood filter.

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

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

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

[0036] The partial reference line formed by the two target points on the reference line is divided into a preset number of segments, and the division points located 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; wherein, when the connection line between the position point corresponding to the LED light source and the lowest target point extends beyond the lower boundary point of the range hood filter, the intersection point of the extension of the connection line between the position point corresponding to the LED light source and the lower boundary point of the range hood filter on the reference line is used as the lowest target point.

[0038] Furthermore, the method for obtaining the clogging level demarcation point in the range hood filter according to the positions of the LED light source and the photosensitive element is as follows:

[0039] The points where the line segments connecting the position point corresponding to the LED light source and the target points corresponding to each photosensitive element pass through the range hood filter are all used as clogging level demarcation points.

[0040] In a second aspect, another embodiment of the present invention provides a range hood filter clogging state monitoring system, which includes: a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of any one of the above methods are implemented.

[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 conducive to comprehensively monitoring the clogging condition of the oil fume filter of the range hood. In order to accurately and efficiently monitor the clogging state of the oil fume filter of the range hood, the clogging level demarcation points in the oil fume filter are then obtained according to the positions of the LED light source and the photosensitive element, which is conducive to accurately analyzing the clogging condition of the oil fume filter of the range hood through the light transmittance subsequently. In order to accurately analyze the current clogging state of the oil fume filter of the range hood, the standard light intensity of each clogging level demarcation point is first obtained according to the distance between each clogging level demarcation point and the LED light source, the incident light direction of each clogging level demarcation point, and the initial light intensity of the LED light source, accurately reflecting the light intensity existing in each clogging level demarcation point itself without considering clogging. Then, according to the distance between each photosensitive element and each clogging level demarcation point, the deviation of the incident light of each photosensitive element from each clogging level demarcation point, and the current light intensity detected by each photosensitive element, the current actual light intensity of each clogging level demarcation point is obtained, accurately reflecting the current actual light intensity transmitted through each clogging level demarcation point, which is conducive to accurately analyzing the current clogging condition of each clogging level demarcation point subsequently. Furthermore, according to the difference between the current actual light intensity and the standard light intensity of each clogging level demarcation point, and the position of each clogging level demarcation point, the current clogging state of the oil fume filter of the range hood is accurately obtained, and the current clogging condition of the oil fume filter of the range hood is accurately determined, which is conducive to providing more reliable information on the clogging state of the oil fume filter of the range hood for users, timely reminding users to clean and maintain the oil fume filter of the range hood, avoiding the further deterioration of the clogging of the oil fume filter of the range hood, and at the same time, the overload operation of the range hood motor can be avoided, the motor loss is reduced, the operation efficiency and reliability of the range hood are improved, and the service life of the range hood is effectively extended. BRIEF DESCRIPTION OF THE DRAWINGS

[0043] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required to be used in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0044] Figure 1 It is a schematic flow chart of a method for monitoring the clogging state of an oil fume filter provided by an embodiment of the present invention;

[0045] Figure 2 It is a front view of the corresponding position points of the LED light source and the photosensitive element provided by an embodiment of the present invention;

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

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

[0048] Figure 5 Schematic diagram of the projected light quantity corresponding to different incident angles of the light of the LED light source provided by an embodiment of the present invention;

[0049] Figure 6 Flowchart of a method for obtaining the current actual light intensity provided by an embodiment of the present invention;

[0050] Figure 7 Structural diagram of a monitoring system for the blocked state of the oil fume filter provided by an embodiment of the present invention;

[0051] Figure 8 Schematic diagram of a computer device provided by an embodiment of the present invention. Detailed implementation manners

[0052] In order to further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following describes in detail the specific implementation manners, structures, features and effects of a method and system for monitoring the blocked state of an oil fume filter according to the present invention in conjunction with the accompanying drawings and preferred embodiments. In the following description, different "one embodiment" or "another embodiment" do not necessarily refer to the same embodiment. In addition, the specific features, structures or characteristics in one or more embodiments can be combined in any suitable form.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs.

[0054] The following specifically describes the specific solutions of a method and system for monitoring the blocked state of an oil fume filter provided by the present invention in conjunction with the accompanying drawings.

[0055] Embodiment 1:

[0056] The specific scenario of this embodiment is as follows: In order to avoid the serious blockage of the oil fume filter of the range hood, which leads to the decrease of the smoke exhaust efficiency of the range hood and the increase of the fan resistance, and further causes the problems of increased motor load, elevated operating noise and shortened service life of the range hood, the existing methods propose the timing reminder method, the weighing detection method and the air pressure detection method to deal with the blockage problem of the oil fume filter of the range hood. Among them, the timing reminder method does not consider the differences in the actual usage frequency of the range hood by users and the degree of oil and dirt accumulation on the oil fume filter, resulting in inaccurate reminders; the detection results of the weighing detection method are easily interfered by humidity, leading to inaccurate monitoring of the blockage state of the oil fume filter, and further inaccurate treatment of the blockage of the oil fume filter; the air pressure detection method has the situation of missing detection of the blocked area in the oil fume filter, and thus cannot accurately monitor the blockage state of the oil fume filter, also resulting in inaccurate treatment of the blockage of the oil fume filter. In order to accurately monitor the blockage state of the oil fume filter, so as to accurately handle the blockage problem of the oil fume filter and improve the service life of the range hood, in this embodiment, based on the principle that the light transmittance of the filter is different when the blockage degree of the oil fume filter is different, the light transmittance of the oil fume filter is analyzed through the measured values of the photosensitive elements at different positions, and then the blockage state of the oil fume filter is judged. The method for monitoring the blockage state of the oil fume filter in this embodiment is not affected by humidity, and at the same time more carefully reflects the blockage conditions of different areas of the oil fume filter, and more accurately monitors the blockage state of the oil fume filter, which is conducive to timely reminding users to clean and maintain the oil fume filter, effectively extending the service life of the range hood.

[0057] The present invention proposes a method for monitoring the blockage state of an oil fume filter. Please refer to Figure 1 , which shows a schematic flowchart of a method for monitoring the blockage state of an oil fume filter provided by an embodiment of the present invention. The method includes 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 demarcation point in the oil fume 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 oil fume filter.

[0059] Specifically, in actual situations, the distribution formats of the filters of different models and specifications of range hoods are different. For example, some range hoods have four filters and the four filters are assembled into the shape of a quadrangular pyramid, and some range hoods only have one filter. This embodiment analyzes each filter separately. Therefore, for different models and specifications of range hoods, the monitoring of the blockage state of their filters is applicable to this embodiment. For the sake of clearly explaining this embodiment, the default scenario of this embodiment is to analyze only one oil fume filter of the range hood.

[0060] In order to analyze the clogging situation of the range hood filter, in this embodiment, the LED light source is set outside the range hood, and the photosensitive element is set inside the range hood. Among them, the photosensitive element is used to obtain the light intensity of the LED light source passing through the range hood filter. The light intensity obtained by the photosensitive element can be transmitted wirelessly or wired to the control system of the range hood, and then the control system analyzes the obtained light intensity data to further determine the clogging degree of the range hood filter.

[0061] When the user turns off the range hood, the range hood filter clogging detection program will be automatically triggered. First, the LED light source is started. It should be noted that the LED light source is set on an automatically foldable bracket. When the range hood filter clogging detection program is started, the automatically foldable bracket where the LED light source is located will automatically extend, so that the LED light source maintains a certain vertical distance from the range hood filter, ensuring that the light of the LED light source can evenly cover the entire range hood filter, and at the same time making the irradiation center of the LED light source the center of the range hood filter, so that the light of the LED light source can irradiate the surface of the range hood filter more comprehensively. In this embodiment, the vertical distance is set to 15 cm, and the implementer can set the size of the vertical distance according to the actual situation, which is not limited here. When the range hood filter clogging detection program ends, the LED light source is turned off and the automatically foldable bracket where it is located will automatically retract. If there is a suitable place in the range hood itself to install the LED light source, there is no need to install an automatically foldable bracket in the range hood.

[0062] In order to accurately and comprehensively monitor the clogging state of the range hood filter, in this embodiment, it is necessary to set the position of the photosensitive element in combination with the design structure of the range hood and the position of the LED light source. In a feasible implementation manner of this embodiment, the method for obtaining the position of the photosensitive element according to the position of the LED light source is as follows: The light emitted by the LED light source is transmitted through the range hood filter and irradiated on an inclined surface on the lower side of the internal flue of the range hood as a reference surface. Among them, the reference surface and the surface where the range hood filter is located can be defaulted to be parallel. Obtain the central axis with endpoints on the upper and lower two sides of the reference surface as the reference line; In order to comprehensively monitor the clogging state of the filter, for any endpoint of the reference line, a point at a specified length from this endpoint on the reference line is used as the target point; In this embodiment, the specified length is set to 3 cm, and the implementer can set the size of the specified length according to the actual situation, which is not limited here. Divide the partial reference line formed by the two target points on the reference line into a preset number of segments, and the division points located between the two target points are also used as target points; In this embodiment, the preset number is set to 3, and the implementer can set the size of the preset number according to the actual situation, which is not limited here. Therefore, there are a total of two division points, that is, there are a total of 4 target points in this embodiment. Take the position of each target point as the position of each photosensitive element. Among them, when the connection line between the position point corresponding to 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, in this embodiment, the intersection point of the extension of the connection line between the position point corresponding to the LED light source and the lower boundary point of the range hood filter on the reference line is used 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 on the lower boundary edge of the range hood filter. In this embodiment, the 4 target points are sequentially marked as S4, S3, S2, and S1 from top to bottom. As Figure 2 shown in the front view of the position points corresponding to the LED light source and the photosensitive element. In Figure 2 the model of the range hood in it is in the format of having four filters. In this embodiment, the left range hood filter is taken as an example for analysis.

[0063] In order to avoid the interference of oil stains on the photosensitivity of the photosensitive element, in this embodiment, a photosensitive protection module is set for each photosensitive element. Among them, the photosensitive protection module is a movable mechanical structure, which is responsible for protecting the photosensitive element from the interference of oil stains and improving the accuracy of monitoring the clogging state of the range hood filter. During the process of not monitoring the clogging state of the range hood filter, the photosensitive protection module is in a closed state, as Figure 3 shown in the schematic diagram of the closed state of the photosensitive protection module to protect the photosensitive element from oil stain interference; During the process of monitoring the clogging state of the range hood filter, the photosensitive protection module is opened through the control system of the range hood, as Figure 4 shown in the schematic diagram of the open state of the photosensitive protection module.

[0064] In order to accurately and efficiently analyze the clogging state of the range hood filter, in this embodiment, the points where the line segments connecting the corresponding position points of the LED light source and the target points corresponding to each photosensitive element pass through the range hood filter are all used as the clogging level demarcation points. By analyzing the light intensity transmitted through each clogging level demarcation point, the clogging situation of the range hood filter is indirectly reflected. Since the range hood filter has a certain tilt angle in the real space, the accumulation of oil fumes is more serious closer to the lower side of the range hood filter, and the distribution of the clogging level demarcation points on the range hood filter is distributed up and down. Therefore, the clogging degree of the range hood filter can be analyzed through the light transmission situation of each clogging level demarcation point. Considering that the position of the range hood filter is almost parallel to the reference plane, the photosensitive elements are all on the central axis of the reference plane, and at the same time, the irradiation center point of the LED light source is the center point of the range hood filter. Therefore, in this embodiment, the clogging level demarcation points are all located on the central axis of the range hood filter, so as to more accurately reflect the clogging state of the range hood filter.

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

[0066] Specifically, due to the structure of the range hood itself, there are differences in the irradiation angles of the LED light source and different positions of the range hood filter, resulting in differences in the light intensities transmitted through different positions of the range hood filter. For example, taking a circular filter hole as an example, when the light is vertically incident on the filter, the maximum amount of light passing through the filter hole is the total area of the circular filter hole; when the light is obliquely incident on the filter, the larger the angle of the oblique light, the smaller the amount of light passing through the filter hole, which is the elliptical area after the inclination of the incident angle of the oblique light, as Figure 5 shown in the schematic diagram of the projected light quantity corresponding to different incident angles of the light of the LED light source. Therefore, in this embodiment, first, according to the incident light direction of each clogging level demarcation point, the standard light intensity corresponding to each clogging level demarcation point itself is preliminarily analyzed; considering that the light intensity of the LED light source shows a decreasing trend with the increase of the distance, therefore, in this embodiment, the standard light intensity of each clogging level demarcation point is obtained according to the distance between each clogging level demarcation point and the LED light source, the incident light direction of each clogging level demarcation point, and the initial light intensity of the LED light source. The larger the standard light intensity, the greater the light intensity received by the corresponding clogging level demarcation point itself.

[0067] Preferably, in an implementable manner of this embodiment, the method for obtaining the standard light intensity is as follows: for any blockage level demarcation point, the Euclidean distance between the blockage level demarcation point and the corresponding position point of the LED light source is taken as the first distance; the greater the first distance, the smaller the light intensity of the blockage level demarcation point affected by the LED light source. Among them, the method for obtaining the Euclidean distance is a well-known technology and will not be elaborated here. In order to determine the incident angle of the LED light source corresponding to the blockage level demarcation point, the line connecting the corresponding position point of the LED light source and the blockage level demarcation point is taken as the incident light of the blockage level demarcation point; then the angle between the incident light and the perpendicular line of the surface where the range hood filter is located is taken as the deviation angle of the incident light of the blockage level demarcation point; the greater the deviation angle of the incident light, the greater the tilt angle of the light of the LED light source passing through the blockage level demarcation point, and the smaller the light intensity of the blockage level demarcation point affected by the LED light source. It should be noted that the value range of the deviation angle of the incident light is from 0° to 90°. In order to determine the standard light intensity corresponding to the blockage level demarcation point itself, in this embodiment, the standard light intensity of the blockage level demarcation point is obtained according to 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; among them, both the initial light intensity and the cosine value of the deviation angle of the incident light are positively correlated with the standard light intensity, and the variance of the first distance is negatively correlated with the standard light intensity.

[0068] Among them, the calculation formula of the standard light intensity is: In the formula, S a is the standard light intensity of the a-th blockage level demarcation point; I0 is the initial light intensity of the LED light source; d a is the first distance corresponding to the a-th blockage level demarcation point; θ a is the deviation angle of the incident light of the a-th blockage level demarcation point; cos is the cosine function. It should be noted that the initial light intensity of the LED light source is known.

[0069] Thus, the standard light intensity of each blockage level demarcation point is obtained.

[0070] Step S3: Obtain the current actual light intensity of each blockage level demarcation point according to the distance between each photosensitive element and each blockage level demarcation point, the deviation of the incident light of each photosensitive element from each blockage level demarcation point, and the current light intensity detected by each photosensitive element.

[0071] Since the known LED light source belongs to a diffuse reflection light source, therefore, the light passing through each blockage level demarcation 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 demarcation point during the current monitoring, and then accurately analyze the current blockage state of the oil fume filter, in this embodiment, according to the distance between each photosensitive element and each blockage level demarcation point, the deviation of the incident light of each photosensitive element from each blockage level demarcation point, and the current light intensity detected by each photosensitive element, the current actual light intensity of each blockage level demarcation point is obtained.

[0072] Preferably, in an implementable manner of this embodiment, for the method of obtaining the current actual light intensity, please refer to Figure 6 , which shows a flowchart of a method for obtaining the current actual light intensity provided by this embodiment. The method includes the following steps:

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

[0074] For any blockage level demarcation point and any photosensitive element, when the photosensitive element is closer to the blockage level demarcation point, and the incident light of the photosensitive element at its position and the blockage level demarcation point is close when approaching, it indicates that the degree of reflection of the light passing through the blockage level demarcation point on the photosensitive element should be greater. When analyzing the light transmissibility of the blockage level demarcation point, the degree of participation of the light intensity detected by the photosensitive element should be greater. Therefore, in this embodiment, according to the distance between each photosensitive element and each blockage level demarcation point, and the deviation of the incident light of each photosensitive element from each blockage level demarcation point, the light intensity reflection weight of each photosensitive element for each blockage level demarcation point is obtained. The greater the light intensity reflection weight, the greater the degree to which the light intensity detected by the corresponding photosensitive element can be referred to when analyzing the light transmissibility of the corresponding blockage level demarcation point.

[0075] In a feasible implementation manner of this embodiment, the acquisition of the light intensity reflection weight is as follows: for any blockage level demarcation point and any photosensitive element, the Euclidean distance between the position point corresponding to the photosensitive element and the blockage level demarcation point is obtained as the second distance; the larger the second distance, the weaker the response degree of the photosensitive element to the light of the LED light source passing through the blockage level demarcation point; at the same time, when the incident light of the blockage level demarcation point deviates more from the position where the photosensitive element is located, it also indicates that the response degree of the photosensitive element to the light of the LED light source passing through the blockage level demarcation point is weaker. Furthermore, in this embodiment, the connection line between the position point corresponding to the photosensitive element and the blockage level demarcation point is used as the first connection line; the included angle between the first connection line and the incident light of the blockage level demarcation point is used as the first included angle; the deviation degree of the photosensitive element from the blockage level demarcation point is accurately reflected through the first included angle. When the first included angle is larger, the photosensitive element deviates more from the incident light direction of the blockage level demarcation point, and the response degree of the photosensitive element to the light of the LED light source passing through the blockage level demarcation point is weaker; in order to determine the light intensity reference situation of the photosensitive element with respect to the blockage level demarcation point, the normalized result of the product of the cosine value of the first included angle and the reciprocal of the square of the second distance is used as the light intensity reflection weight of the photosensitive element with respect to the blockage level demarcation point; in this embodiment, the product of the cosine value of the first included angle and the reciprocal of the square of the second distance is normalized through the norm normalization function.

[0076] Thus, the light intensity reflection weight of each photosensitive element with respect to each blockage level demarcation point is obtained.

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

[0078] When the light intensity reflection weight of a certain photosensitive element with respect to a certain blockage level demarcation point is larger, the current light intensity detected by the photosensitive element participates more in reflecting the light transmission degree of the blockage level demarcation point. Furthermore, 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 with respect to the blockage level demarcation point.

[0079] Thus, the current light intensity reference value of each photosensitive element with respect to each blockage level demarcation point is obtained.

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

[0081] In order to determine the current actual light intensity of each blockage level demarcation point and accurately analyze the current blockage degree of the oil fume filter, in this embodiment, for any blockage level demarcation point, the sum result of the current light intensity reference values of all photosensitive elements with respect to the blockage level demarcation point is used as the current actual light intensity of the blockage level demarcation point. The smaller the current actual light intensity, the more serious the blockage of the filter corresponding to the blockage level demarcation point.

[0082] Thus far, the current actual light intensity of each clogging level demarcation point is obtained.

[0083] Step S4: 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 demarcation point, and the position of each clogging level demarcation point.

[0084] Specifically, when the difference between the current actual light intensity and the standard light intensity of a certain clogging level demarcation point is greater, it indicates that there is a more likely clogging problem at this clogging level demarcation point. Furthermore, in this embodiment, according to the difference between the current actual light intensity and the standard light intensity of each clogging level demarcation point, the current clogging degree of each clogging level demarcation point is obtained, and then the clogging level demarcation points with current clogging are determined. Considering that the oil stains of the range hood will be more concentrated on the lower side of the filter, therefore, when the current clogging degree of the clogging level demarcation point closer to the top is greater, it indicates that the clogging area of the current range hood filter is larger, indirectly indicating that the current clogging state of the range hood filter is more serious.

[0085] In a feasible implementation manner of this embodiment, the method for obtaining the current clogging degree is: taking the normalized result of the difference between the standard light intensity and the current actual light intensity of each clogging level demarcation point as the current clogging degree of each clogging level demarcation point. In this embodiment, the difference between the standard light intensity and the current actual light intensity of each clogging level demarcation point is normalized by the norm normalization function.

[0086] It is known that the greater the current clogging degree, the more likely it is that there is a clogging situation in the corresponding clogging level demarcation point and the area of the range hood filter below it. Furthermore, in this embodiment, a preset clogging degree threshold is set to 0.7. The implementer can set the size of the preset clogging degree threshold according to the actual situation, which is not limited here. When the current clogging degree is greater than the preset clogging degree threshold, the corresponding clogging level demarcation point is used as the clogging analysis point. Considering that the clogging situations of the range hood filters corresponding to different clogging level demarcation points are different, furthermore, in this embodiment, the clogging level demarcation points are arranged in ascending order from bottom to top. The first clogging level demarcation point is divided into level 1, the second clogging level demarcation point is divided into level 2, the third clogging level demarcation point is divided into level 3, and so on, to complete the level division of all clogging level demarcation points. It is known that there are a total of 4 target points in this embodiment, and furthermore, there are 4 clogging level demarcation points in this embodiment, that is, there are a total of 4 levels; then, the level corresponding to each clogging analysis point is obtained, and the highest level is used as the current clogging state of the range hood filter.

[0087] When the current clogging degree of the clogging analysis point is greater, it can also indicate that the current clogging state of the range hood filter is more serious. Therefore, in another feasible implementation manner of this embodiment, the average value of the current clogging degrees of all clogging analysis points is obtained as the current clogging state of the range hood filter.

[0088] After the detection program of the range hood filter clogging ends, the current clogging state of the range hood filter is displayed on the control panel of the range hood. When the current clogging state of the range hood filter is the preset first specified level, or greater than the preset first clogging analysis threshold and less than or equal to the preset second clogging analysis threshold, the range hood emits a beeping alarm, and when the user subsequently uses the range hood, it prompts that the range hood filter needs to be cleaned and maintained; when the current clogging state of the range hood filter is the preset second specified level, or greater than the preset second clogging analysis threshold, the control system of the range hood automatically limits the highest gear of the fan to protect the motor, avoid the motor of the range hood from overloading, and extend the service life of the range hood. In this embodiment, the preset first specified level is set as level 3, the preset second specified level is set as level 4, the preset first clogging analysis threshold is set as 0.5, and the preset second clogging analysis threshold is set as 0.7. Implementers can set the preset first specified level, the preset second specified level, the preset first clogging analysis threshold, and the preset second clogging analysis threshold according to the actual situation, and no limitation is made here.

[0089] Thus, accurately monitoring the current clogging state of the range hood filter is beneficial to providing more reliable information on the clogging state of the range hood filter for users, timely reminding users to clean and maintain the range hood filter, avoiding further deterioration of the clogging of the range hood filter, while avoiding the overload operation of the range hood motor, reducing the motor loss, improving the operation efficiency and reliability of the range hood, and effectively extending the service life of the range hood.

[0090] In summary, in this embodiment, the position of the photosensitive element is obtained according to the position of the LED light source, and then the clogging level demarcation point in the range hood filter is obtained; the standard light intensity is obtained according to the distance between the clogging level demarcation point and the LED light source and the incident light of the clogging level demarcation point; the current actual light intensity is obtained according to the distance between the photosensitive element and the clogging level demarcation point, the deviation of the incident light of the photosensitive element from the clogging level demarcation point, and the current light intensity detected by the photosensitive element; the current clogging state of the range hood filter is obtained according to the difference between the current actual light intensity of the clogging level demarcation point and the standard light intensity, as well as the position. The present invention accurately obtains the current clogging state of the range hood filter by analyzing the current actual light intensity and position of the clogging level demarcation point, which is beneficial to timely and accurately handling the problem of clogging of the range hood filter.

[0091] Embodiment 2:

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

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

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

[0095] The current actual light intensity acquisition module 30 is configured to acquire the current actual light intensity of each blockage level demarcation point according to the distance between each photosensitive element and each blockage level demarcation point, the deviation of the incident light of each photosensitive element from each blockage level demarcation point, and the current light intensity detected by each photosensitive element.

[0096] The oil fume filter blocked state analysis module 40 is configured to acquire the current blocked state of the oil fume filter according to the difference between the current actual light intensity and the standard light intensity of each blockage level demarcation point, and the position of each blockage level demarcation point.

[0097] It should be noted that: for the system provided in the above embodiment, only the above-mentioned functional module division is used for illustration. In practical applications, the above functions can be allocated to different functional modules as needed, that is, the internal structure of the computer device is divided into different functional modules to complete all or part of the functions described above. In addition, a monitoring system for the blocked state of an oil fume filter provided in the above embodiment and an embodiment of a method for monitoring the blocked state of an oil fume filter belong to the same concept. The specific implementation process is detailed in the method embodiment and will not be repeated here.

[0098] Embodiment 3:

[0099] The present invention also provides a monitoring device for the blocked state of an oil fume filter. The device includes a memory and a processor. Specifically, the memory stores executable program codes, and the processor is configured to call and execute the executable program codes to perform a method for monitoring the blocked state of an oil fume filter provided in an embodiment of the present application. The device may specifically be a chip, a component or a module. The chip may include a processor and a memory connected thereto. The memory is used to store instructions. When the processor calls and executes the instructions, the chip can perform the method for monitoring the blocked state of an oil fume filter provided in the above embodiment.

[0100] In addition, the present invention also protects a computer device. Please refer to 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. When the processor 402 executes the computer program 403, the computer device can execute any one of the methods for monitoring the blocked state of an oil fume filter introduced above.

[0101] Embodiment 4:

[0102] The present invention also provides a computer-readable storage medium. Computer program codes are stored in the computer-readable storage medium. When the computer program codes run on a computer, the computer is enabled to execute the above-related method steps to implement a method for monitoring the blocked state of an oil fume filter provided in the above embodiment.

[0103] Embodiment 5:

[0104] The present invention also provides a computer program product. When the computer program product runs on a computer, the computer is enabled to execute the above-related steps to implement a method for monitoring the blocked state of an oil fume filter provided in the above embodiment.

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

[0106] It should be noted that: the above sequence of embodiments of the present invention is only for description and does not represent the superiority or inferiority of the embodiments. The processes depicted in the drawings do not necessarily require the specific order or continuous order shown to achieve the desired result. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0107] Each embodiment in this specification is described in a progressive manner. The same or similar parts among the embodiments can be referred to each other, and the key points of each embodiment are the differences from other embodiments.

Claims

1. A method for monitoring the clogging state of an oil fume filter, characterized in that, The method includes the following steps: Obtain the position of the photosensitive element according to the position of the LED light source; obtain the clogging level demarcation points 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, 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. Obtain the standard light intensity of each clogging level demarcation point according to the distance between each clogging level demarcation point and the LED light source, the incident light direction of each clogging level demarcation point, and the initial light intensity of the LED light source. Obtain the current actual light intensity of each clogging level demarcation point according to the distance between each photosensitive element and each clogging level demarcation point, the deviation of the incident light of each photosensitive element from each clogging level demarcation point, and the current light intensity detected by each photosensitive element. 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 demarcation point, and the position of each clogging level demarcation point.

2. The method for monitoring the clogging state of an oil fume filter as described in claim 1, wherein, The method for obtaining the standard light intensity is as follows: For any clogging level demarcation point, take the distance between the corresponding position point of this clogging level demarcation point and the LED light source as the first distance; Take the line connecting the corresponding position point of the LED light source and this clogging level demarcation point as the incident light of this clogging level demarcation point; Take the angle between the incident light and the perpendicular line of the plane where the range hood filter is located as the incident light deviation angle of this clogging level demarcation point; Obtain the standard light intensity of this clogging level demarcation point according to the initial light intensity of the LED light source, the variance of the first distance, and the cosine value of the incident light deviation angle; wherein, both the initial light intensity and the cosine value of the incident light deviation angle are positively correlated with the standard light intensity, and the variance of the first distance is negatively correlated with the standard light intensity.

3. The method for monitoring the clogging state of an oil fume filter as described in claim 2, wherein, The method for obtaining the current actual light intensity is as follows: For any clogging level demarcation point and any photosensitive element, obtain the distance between the corresponding position point of this photosensitive element and this clogging level demarcation point as the second distance; Take the line connecting the corresponding position point of this photosensitive element and this clogging level demarcation point as the first connection line; Take the angle between the first connection line and the incident light of this clogging level demarcation point as the first angle; Take the normalized result of the product of the cosine value of the first angle and the reciprocal of the square of the second distance as the light intensity reflection weight of this photosensitive element for this clogging level demarcation point; Take the product of the current light intensity detected by this photosensitive element and the light intensity reflection weight as the current light intensity reference value of this photosensitive element for this clogging level demarcation point; Take the sum of the current light intensity reference values of all photosensitive elements for this clogging level demarcation point as the current actual light intensity of this clogging level demarcation point.

4. The method for monitoring the clogging state of an oil fume filter as claimed in claim 1, wherein The method for obtaining 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 demarcation point, and the position of each clogging level demarcation point is as follows: Obtain the current clogging degree of each clogging level demarcation point according to the difference between the current actual light intensity and the standard light intensity of each clogging level demarcation point; Obtain the current clogging state of the range hood filter according to the current clogging degree and position of each clogging level demarcation point.

5. The method for monitoring the clogging state of an oil fume filter as claimed in claim 4, wherein, The method for obtaining the current degree of blockage is as follows: The result of normalizing the difference between the standard light intensity and the current actual light intensity at each blockage level demarcation point is used as the current degree of blockage at each blockage level demarcation point.

6. The monitoring method for the blocked state of an oil fume filter as described in claim 4, characterized in that, The method for obtaining the current blockage state of the range hood filter is as follows: Arrange the blockage level demarcation points in ascending order. Designate the first blockage level demarcation point as level 1, the second blockage level demarcation point as level 2, the third blockage level demarcation point as level 3, and so on, to complete the level division of all blockage level demarcation points; When the current degree of blockage is greater than the preset blockage degree threshold, the corresponding blockage level demarcation point is used as the blockage analysis point; Obtain the level corresponding to each blockage analysis point, and use the highest level as the current blockage state of the range hood filter.

7. The method for monitoring the clogging state of an oil fume filter as claimed in claim 6, wherein, The method for obtaining the current blockage state of the range hood filter further includes: Obtain the average value of the current degrees of blockage of all blockage analysis points as the current blockage state of the range hood filter.

8. The method for monitoring the clogging state of an oil fume filter screen according to claim 1, characterized in that, The method for obtaining the position of the photosensitive element according to the position of the LED light source is as follows: Let the light emitted by the LED light source pass through the range hood filter and irradiate on an inclined surface on the lower side of the inner flue of the range hood as a reference surface, and obtain the mid-axis of the upper and lower sides of the reference surface where the endpoints are located as the reference line; For any endpoint of the reference line, a point on the reference line at a specified length from the endpoint is used as the target point; Divide the local reference line formed by the two target points on the reference line into a preset number of segments, and all the division points between the two target points are used as target points; The position of each target point is used as the position of each photosensitive element; among them, when the connection line between the position point corresponding to the LED light source and the lowest target point extends beyond the lower boundary point of the range hood filter, the intersection point of the extension of the connection line between the position point corresponding to the LED light source and the lower boundary point of the range hood filter on the reference line is used as the lowest target point.

9. The method for monitoring the clogging state of an oil fume filter according to claim 8, wherein The method for obtaining the blockage level demarcation points in the range hood filter according to the positions of the LED light source and the photosensitive element is as follows: All the points where the line segments connecting the position point corresponding to the LED light source and the target points corresponding to each photosensitive element pass through the range hood filter are used as blockage level demarcation points.

10. An oil fume filter clogging state monitoring system, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method for monitoring the blockage state of a range hood filter according to any one of claims 1-9 above.

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