CN114838453A - Formaldehyde detection method, formaldehyde detection device, air purifier and storage medium - Google Patents
Formaldehyde detection method, formaldehyde detection device, air purifier and storage medium Download PDFInfo
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/70—Control systems characterised by their outputs; Constructional details thereof
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
- F24F11/74—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity
- F24F11/77—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure for controlling air flow rate or air velocity by controlling the speed of ventilators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to the technical field of air purification, in particular to a formaldehyde detection method, a formaldehyde detection device, an air purifier and a storage medium. The formaldehyde detection method comprises the following steps: acquiring a detection value of a formaldehyde detection part; acquiring the actual rotating speed of the fan; calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotating speed of the formaldehyde detection part; and obtaining a display value corresponding to the detection value according to the detection value and the compensation value. According to the invention, the compensation value corresponding to the detection value is calculated according to the initial detection value of the formaldehyde detection part and the actual rotating speed, and the detection value is compensated through the compensation value to obtain the display value, so that the display value is closer to the real value, and the problem of low response speed of the formaldehyde display value in the prior art during formaldehyde measurement is effectively solved.
Description
Technical Field
The invention relates to the technical field of air purification, in particular to a formaldehyde detection method, a formaldehyde detection device, an air purifier and a storage medium.
Background
Formaldehyde is a common toxic and harmful gas in daily life, and although the formaldehyde content is generally low, the exceeding of the formaldehyde brings great harm to human bodies. Since formaldehyde release is a slow process that has a continuous impact on human health, more and more people are concerned about the exact actual content of formaldehyde in order to take countermeasures in time.
At present, part of air purifiers have the function of removing formaldehyde and have the function of displaying formaldehyde values. Most of the air purifiers with the function of displaying formaldehyde values adopt an electrochemical formaldehyde sensor to detect the concentration of environmental formaldehyde and convert the concentration into corresponding numerical information for displaying. However, in a common electrochemical formaldehyde sensor, the response speed of the sensor for converting the environmental formaldehyde concentration into a numerical value is not fast enough or the sensor responds to an interfering substance such as alcohol, so that a displayed value has a certain deviation from an actual value. For example, when the air purifier moves from a formaldehyde-free environment to an environment containing formaldehyde, since the detection of the formaldehyde sensor depends on the free diffusion of air, a certain time is required for other formaldehyde-containing substances in the environment to freely diffuse to the position of the formaldehyde sensor inside the machine body, and the displayed value of formaldehyde is inaccurate at the beginning of detection. For example, when someone uses an interfering substance having a similar molecular structure to formaldehyde, such as perfume or disinfectant containing alcohol, around the air purifier, the electrochemical formaldehyde sensor will respond, and its detected value will suddenly increase, but the actual formaldehyde content will not change, resulting in a deviation between the displayed value and the actual value. Therefore, how to improve the real-time performance and the anti-interference performance of the formaldehyde display value of the air purifier using the formaldehyde sensor is very important for improving the user experience of the air purifier.
Disclosure of Invention
Therefore, the technical problem to be solved by the invention is to overcome the defect of low response speed of formaldehyde display numerical value when an electrochemical formaldehyde sensor is used for measuring formaldehyde in the prior art, so that a formaldehyde detection method, a formaldehyde detection device, an air purifier and a storage medium are provided.
In order to solve the problems, the invention provides a formaldehyde detection method, which comprises the following steps: acquiring a detection value of a formaldehyde detection part; acquiring the actual rotating speed of the fan; calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotating speed of the formaldehyde detection part; and obtaining a display value corresponding to the detection value according to the detection value and the compensation value.
Optionally, the step of calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotation speed of the formaldehyde detection component includes: calculating the compensation duration according to the actual rotating speed; and calculating a compensation value corresponding to the detection value in the compensation time length according to the initial compensation value corresponding to the initial detection value of the formaldehyde detection part, a preset final compensation value and the compensation time length.
Optionally, the step of calculating the compensation duration according to the actual rotation speed includes: acquiring a preset highest rotating speed and a first duration corresponding to the highest rotating speed; acquiring a preset lowest rotating speed and a second time length corresponding to the lowest rotating speed; and obtaining the compensation time length corresponding to the actual rotating speed by utilizing the highest rotating speed, the lowest rotating speed, the first time length, the second time length and the actual rotating speed and adopting an interpolation method.
Optionally, the step of obtaining the initial compensation value includes: acquiring a corresponding relation between a preset interval range and an initial compensation value; determining an interval range to which the initial detection value belongs; and obtaining an initial compensation value according to the interval range and the corresponding relation to which the initial detection belongs.
Optionally, the step of calculating the compensation value corresponding to the detection value within the compensation time period according to the initial compensation value corresponding to the initial detection value of the formaldehyde detection component, the preset final compensation value, and the compensation time period includes: calculating a difference between the initial compensation value and the final compensation value; obtaining a compensation value corresponding to each moment in the compensation duration according to the difference and a preset rule; and obtaining a compensation value corresponding to the detection value in the compensation duration according to the corresponding relation between the detection value and each moment in the compensation duration and the compensation value corresponding to each moment in the compensation duration.
Optionally, after acquiring the actual rotation speed of the fan, the formaldehyde detection method further includes: acquiring the working time of a formaldehyde detection component in the current environment; and when the working time length is less than the compensation time length, executing a step of calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotating speed of the formaldehyde detection part.
Optionally, after acquiring the actual rotation speed of the fan, the formaldehyde detection method further includes: acquiring the last display value of the formaldehyde detection component; and when the absolute value of the difference value between the detection value and the last display value is less than or equal to a preset threshold value, executing the step of calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotating speed of the formaldehyde detection part.
Optionally, the formaldehyde detection method further comprises: and when the absolute value of the difference value between the detection value and the last display value is larger than the threshold value, taking the last display value as the display value of the formaldehyde detection part.
The invention also provides a formaldehyde detection device, comprising: the first acquisition module is used for acquiring the detection value of the formaldehyde detection component; the second acquisition module is used for acquiring the actual rotating speed of the fan; the calculating module is used for calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotating speed of the formaldehyde detection part, and the processing module is used for obtaining a display value corresponding to the detection value according to the detection value and the compensation value.
The present invention also provides an air purifier, comprising: a housing having an air inlet; the formaldehyde detection part is arranged on the shell and is close to the air inlet; the fan is arranged in the shell; the controller comprises a processor and a memory, the processor is electrically connected with the formaldehyde detection component and the fan, and the memory is in communication connection with the processor; the memory stores instructions executable by the processor, and the instructions are executed by the processor to enable the processor to execute the formaldehyde detection method.
Optionally, the air inlet is provided with an air inlet grille, and the distance between the formaldehyde detection component and the air inlet grille is 15 mm-20 mm.
Optionally, the formaldehyde detection component is arranged above the air inlet.
The invention also provides a computer readable storage medium, which stores computer instructions, and the instructions are executed by a processor to realize the formaldehyde detection method.
The invention has the following advantages:
1. according to the initial detection value and the actual rotating speed of the formaldehyde detection part, the compensation value corresponding to the detection value is calculated, the detection value is compensated through the compensation value to obtain the display value, the display value is closer to the true value, and the problem that the response speed of the formaldehyde display value is low during formaldehyde measurement in the prior art is effectively solved.
2. Compensating the detection value within the compensation time length, wherein the detection value is the same as the display value after the compensation time length is exceeded, and the compensation is not needed, so that the steps are simplified; the initial compensation value is different along with the difference of the initial detection value, the larger the initial detection value is, the larger the deviation between the display value and the detection value is, so that the larger the initial compensation value is, the smaller the initial detection value is, the smaller the deviation between the display value and the detection value is, and the smaller the initial compensation value is; the compensation time length is different along with the difference of the rotating speed, the larger the rotating speed is, the faster the air convection is, the shorter the compensation time length is, the smaller the rotating speed is, the slower the air convection is, the longer the compensation time length is, and the detection response speed is accelerated.
3. When the absolute value of the difference value between the detection value and the last display value is larger than the threshold value, the environment is judged to be abnormal, an interference substance exists in the environment, the detection value detected by the formaldehyde detection part cannot truly reflect the formaldehyde content in the environment, the last display value is used as the display value of the formaldehyde detection part, the display value displayed by the display part is controlled to be kept unchanged, the last display value can truly reflect the formaldehyde content in the environment, the instantaneity and the anti-interference performance of the formaldehyde display value are improved, and the experience feeling of a user is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 shows a schematic flow diagram of a formaldehyde detection method according to an embodiment of the invention;
FIG. 2 is a schematic view showing a formaldehyde detecting apparatus according to an embodiment of the present invention;
FIG. 3 is a graph showing a measured value of formaldehyde concentration and a display value with respect to a change with time in accordance with an embodiment of the present invention;
FIG. 4 is a graph showing the measured formaldehyde concentration and the display value as a function of the operating time according to the example of the present invention;
fig. 5 shows a schematic front view of an air purifier according to an embodiment of the present invention.
Description of reference numerals:
10. a housing; 20. a formaldehyde detection component; 30. an air inlet grille; 40. and (5) an air outlet grid.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 and 5, the formaldehyde detection method of the present embodiment includes the following steps:
acquiring a detection value of the formaldehyde detection part 20; the formaldehyde detection component 20 can detect the concentration of formaldehyde, and the formaldehyde detection component 20 is a formaldehyde sensor;
acquiring the actual rotating speed of the fan;
calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotating speed of the formaldehyde detection part 20; the rotating speed of the fan can influence the flow rate of the wind field, so that the time for the formaldehyde detection component to obtain the gas in the external real environment is influenced;
and obtaining a display value corresponding to the detection value according to the detection value and the compensation value, wherein the sum of the detection value and the compensation value is the display value.
By applying the formaldehyde detection method of the embodiment, the compensation value corresponding to the detection value is calculated according to the initial detection value and the actual rotation speed of the formaldehyde detection part 20, and the detection value is compensated through the compensation value to obtain the display value, so that the display value is closer to the real value, and the problem of low response speed of the formaldehyde display value during formaldehyde measurement in the prior art is effectively solved.
In the present embodiment, the step of calculating the compensation value corresponding to the detection value based on the initial detection value and the actual rotation speed of the formaldehyde detection section 20 includes: calculating the compensation duration according to the actual rotating speed; the compensation value corresponding to the detection value within the compensation period is calculated based on the initial compensation value corresponding to the initial detection value of the formaldehyde detection section 20, the preset final compensation value, and the compensation period. Compensating the detection value within the compensation time length, wherein the detection value is the same as the display value after the compensation time length is exceeded, and the compensation is not needed, so that the steps are simplified; the initial compensation value is different along with the difference of the initial detection value, the larger the initial detection value is, the larger the deviation between the display value and the detection value is, and the larger the initial compensation value is; the smaller the initial detection value is, the smaller the deviation between the display value and the detection value is, thereby making the initial compensation value smaller; the compensation time length is different along with the difference of the rotating speed, the larger the rotating speed is, the faster the air convection is, and the shorter the compensation time length is; the smaller the rotating speed is, the slower the air convection is, the longer the compensation time is, and the detection response speed is accelerated. It is to be understood that, as an alternative embodiment, the detection value may be compensated after the compensation time period is exceeded, in which case the compensation value is 0.
In this embodiment, the step of calculating the compensation period according to the actual rotation speed includes: acquiring a preset highest rotating speed and a first duration corresponding to the highest rotating speed; acquiring a preset lowest rotating speed and a second time length corresponding to the lowest rotating speed; and obtaining the compensation time length corresponding to the actual rotating speed by utilizing the highest rotating speed, the lowest rotating speed, the first time length, the second time length and the actual rotating speed and adopting an interpolation method. The first duration and the second duration are obtained through the wind field simulation condition and actual test data of the air purifier, and the actual test data are obtained through multiple tests and averaging. For example, the maximum rotation speed is 1450r/min, the first duration is 0.4 hour, the minimum rotation speed is 950r/min, the second duration is 1.3 hours, and the compensation duration corresponding to the intermediate rotation speed between the maximum rotation speed and the minimum rotation speed is obtained by interpolation. Specifically, the interpolation method is obtained by calculating the difference value averagely, the highest rotating speed is 1450r/min n, the lowest rotating speed is 950r/min, the rotating speed difference is 500, the compensation time duration is 0.4 hour to 1.3 hours, the time duration difference is 0.9 hour, the interpolation calculation is 0.9/500-0.0018 hour/revolution, and the compensation time duration is increased by 0.0018 hour when the rotating speed is reduced by 1 r/min.
In this embodiment, the step of obtaining the initial compensation value includes: acquiring a corresponding relation between a preset interval range and an initial compensation value; determining an interval range to which the initial detection value belongs; and obtaining an initial compensation value according to the interval range and the corresponding relation to which the initial detection belongs. The initial compensation value is obtained by a large amount of actual test data, the initial compensation value is related to the initial detection value, the larger the initial detection value is, the larger the initial compensation value is, and the initial display value is the sum of the initial detection value and the initial compensation value, wherein, part of the actual test data is as shown in table 1 below.
TABLE 1
Note that, the compensation value Δ N in table 1 is the difference between the test value of the standard instrument and the test value of the formaldehyde sensor.
Specifically, the number of the interval ranges is three, and the interval ranges are a first interval range, a second interval range and a third interval range, respectively, when the initial detection value is in the first interval range, the initial compensation value is a first compensation value, when the initial detection value is in the second interval range, the initial compensation value is a second compensation value, when the initial detection value is in the third interval range, the initial compensation value is a third compensation value, the first compensation value is smaller than the second compensation value, and the second compensation value is smaller than the third compensation value. For example, the first interval is (0, 0.03), the first offset is 0.03, the second interval is (0.03,0.08), the second offset is 0.05, the third interval is [0.08, + ∞ ], and the second offset is 0.07.
In the present embodiment, the step of calculating the compensation value corresponding to the detection value within the compensation period based on the initial compensation value corresponding to the initial detection value of the formaldehyde detection section 20, the preset final compensation value, and the compensation period includes: calculating a difference between the initial compensation value and the final compensation value; obtaining a compensation value corresponding to each moment in the compensation duration according to the difference and a preset rule; and obtaining a compensation value corresponding to the detection value in the compensation duration according to the corresponding relation between the detection value and each moment in the compensation duration and the compensation value corresponding to each moment in the compensation duration. The final compensation value is 0, and the compensation value decreases with the increase of time, for example, the compensation value decreases at a constant speed with the increase of time, and the change of the compensation value with the change of time can form a straight line. It will be appreciated that as an alternative embodiment, the compensation value decreases with increasing time and the change in the compensation value with time may form a curve.
In this embodiment, after acquiring the actual rotation speed of the fan, the formaldehyde detection method further includes: acquiring the working time of the formaldehyde detection part 20 in the current environment; when the operating time period is shorter than the compensation time period, a step of calculating a compensation value corresponding to the detection value based on the initial detection value and the actual rotation speed of the formaldehyde detection section 20 is performed. When the operating time is longer than or equal to the compensation time, the detection value detected by the formaldehyde detection unit 20 is the true value of the current environment, and the detection value does not need to be compensated. It is to be understood that this step may not be provided, and the detected value may be compensated after the compensation time has elapsed, in which case the compensation value is 0.
In this embodiment, after acquiring the actual rotation speed of the fan, the formaldehyde detection method further includes: acquiring the last display value of the formaldehyde detection part 20; when the absolute value of the difference between the detected value and the last displayed value is less than or equal to a preset threshold value, a step of calculating a compensation value corresponding to the detected value according to the initial detected value and the actual rotation speed of the formaldehyde detecting part 20 is performed. When the absolute value of the difference value between the detection value and the last display value is smaller than or equal to a preset threshold value, the environment is judged to be normal, no interfering substance exists at the moment, and the detection value can be compensated.
In this embodiment, the formaldehyde detection method further includes: when the absolute value of the difference between the detected value and the last displayed value is greater than the threshold value, it is determined that the environment is abnormal, an interfering substance exists in the environment, the detected value detected by the formaldehyde detection part 20 cannot truly reflect the formaldehyde content in the environment, the last displayed value is taken as the displayed value of the formaldehyde detection part 20, the displayed value displayed by the display part is controlled to be kept unchanged, the last displayed value can truly reflect the formaldehyde content in the environment, the instantaneity and the anti-interference performance of the formaldehyde display value are improved, and the experience feeling of a user is improved.
Specifically, under the common practical use environment, the change of the formaldehyde cannot exceed 0.1mg/m 3 The mutation(s) of (2) occurs only in the presence of interfering substances, so that the threshold is 0.1mg/m 3 。
In this embodiment, after obtaining the display value corresponding to the detection value according to the detection value and the compensation value, the formaldehyde detection method further includes: the display means is controlled to display the display value. Wherein, the display part is a display screen and the like.
In this embodiment, before acquiring the initial detection value of the formaldehyde detection means, the formaldehyde detection method further includes: and acquiring a starting signal of the air purifier. The detection of the formaldehyde detection component is inaccurate only in a period of time after the air purifier is started, so that the initial detection value of the formaldehyde detection component is obtained after the air purifier is started, the initial compensation value is obtained according to the initial detection value, and the running time and the like are continuously obtained.
According to the formaldehyde detection method, the corresponding speed and accuracy of the sensor are considered to be influenced by the wind speed, the compensation value is calculated through the wind speed of the fan, the detection value is calibrated, and meanwhile, the treatment on the interferents is relatively simple and clear.
The invention also provides a formaldehyde detection device, which comprises: a first acquisition module for acquiring a detection value of the formaldehyde detection part 20; the second acquisition module is used for acquiring the actual rotating speed of the fan; a calculating module for calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotation speed of the formaldehyde detecting part 20, and a processing module for obtaining a display value corresponding to the detection value according to the detection value and the compensation value.
In this embodiment, the calculation module includes: the first calculation submodule is used for calculating the compensation duration according to the actual rotating speed; and a second calculating sub-module for calculating a compensation value corresponding to the detection value within the compensation period according to the initial compensation value corresponding to the initial detection value of the formaldehyde detecting part 20, a preset final compensation value, and the compensation period.
In this embodiment, the first calculation submodule includes: the first acquisition unit is used for acquiring a preset highest rotating speed and a first duration corresponding to the highest rotating speed; the second acquisition unit is used for acquiring a preset lowest rotating speed and a second duration corresponding to the lowest rotating speed; and the first processing unit is used for obtaining the compensation time length corresponding to the actual rotating speed by utilizing the highest rotating speed, the lowest rotating speed, the first time length, the second time length and the actual rotating speed and adopting an interpolation method.
In this embodiment, the formaldehyde detecting apparatus further includes a third obtaining module, configured to obtain the initial compensation value, where the third obtaining module includes: a third obtaining unit, configured to obtain a corresponding relationship between a preset interval range and an initial compensation value; the second processing unit is used for determining the section range to which the initial detection value belongs; and the third processing unit is used for obtaining an initial compensation value according to the interval range to which the initial detection belongs and the corresponding relation.
In this embodiment, the second calculation submodule includes: a first calculation unit for calculating a difference between the initial compensation value and the final compensation value; the fourth processing unit is used for obtaining a compensation value corresponding to each moment in the compensation duration according to the difference value and a preset rule; and the fifth processing unit is used for obtaining a compensation value corresponding to the detection value in the compensation duration according to the corresponding relation between the detection value and each moment in the compensation duration and the compensation value corresponding to each moment in the compensation duration.
In this embodiment, the formaldehyde detecting apparatus further includes: a fourth obtaining module, configured to obtain a working duration of the formaldehyde detecting component 20 in the current environment; and the first execution module is used for executing the step of calculating the compensation value corresponding to the detection value according to the initial detection value and the actual rotating speed of the formaldehyde detection part 20 when the working time length is less than the compensation time length.
In this embodiment, the formaldehyde detecting apparatus further includes: a fifth obtaining module, configured to obtain a last display value of the formaldehyde detecting component 20; and a second execution module, configured to execute the step of calculating a compensation value corresponding to the detection value according to the initial detection value and the actual rotation speed of the formaldehyde detection component 20 when the absolute value of the difference between the detection value and the last display value is smaller than or equal to a preset threshold.
In this embodiment, the formaldehyde detecting apparatus further includes: and a third executing module, configured to, when the absolute value of the difference between the detected value and the last displayed value is greater than the threshold, use the last displayed value as the displayed value of the formaldehyde detecting unit 20, and control the displayed value displayed by the displaying unit to remain unchanged.
In this embodiment, the formaldehyde detecting apparatus further includes: and the fourth execution module is used for controlling the display component to display the display value.
In this embodiment, the formaldehyde detecting apparatus further includes: and the sixth acquisition module is used for acquiring a starting signal of the air purifier.
The present invention also provides an air purifier, as shown in fig. 2 and 5, comprising: the formaldehyde detector comprises a shell 10, a formaldehyde detection part, a fan and a controller, wherein the shell 10 is provided with an air inlet; the formaldehyde detection part is arranged on the shell 10 and is close to the air inlet; the fan is arranged in the shell 10; the controller comprises a processor and a memory, the processor is electrically connected with the formaldehyde detection component and the fan, and the memory is in communication connection with the processor; the memory stores instructions executable by the processor, and the instructions are executed by the processor to enable the processor to execute the formaldehyde detection method.
Specifically, the formaldehyde detection component is a formaldehyde sensor, the formaldehyde sensor belongs to an electrochemical sensor, and the detection mechanism is based on the fuel cell principle of current amperometry, water molecules in formaldehyde molecule binding environment are ionized at a working electrode to generate hydrogen ions and CO2, because the hydrogen ions have positive charges, equivalent electrons (negative charges) are attracted to form micro current (nA), the current is in direct proportion to the formaldehyde concentration, then hydrogen atoms and equivalent electrons generated at a counting electrode and the working electrode are transferred to the counting electrode through electrolyte, oxygen in the environment is combined, the counting electrode reacts to generate water molecules, and the formaldehyde concentration is converted by detecting the current in the reaction process.
From the chemical reaction mechanism of the formaldehyde sensor, the formaldehyde sensor is greatly influenced by water molecules in the environment. If natural convection does not exist, the formaldehyde sensor completely depends on the diffusion effect of air to react with chemical substances of the formaldehyde sensor, the reaction speed and the reaction process are relatively slow, if the air convection is increased, the reaction speed can be increased, but too strong convection cannot exist, because the too strong convection can affect water molecules in the chemical reaction, and the detection accuracy of the formaldehyde sensor is affected. Therefore, the location of the formaldehyde sensor is important. Through air purifier's wind field analysis, it is the mounted position of formaldehyde sensor to obtain the position that is close to air inlet department, can improve the detection accuracy of formaldehyde sensor in the position that is close to air inlet department.
In this embodiment, an air inlet grille 30 is disposed at the air inlet, and the distance between the formaldehyde detecting component and the air inlet grille 30 is 15 mm-20 mm. Through the wind field analysis of the air purifier, the position at the position 15-20 mm away from the air inlet grille is optimal, so that a better convection wind speed can be obtained, a higher response speed can be obtained, and the influence on the accuracy of the formaldehyde sensor due to overlarge wind speed can be avoided.
In this embodiment, the formaldehyde detecting component is disposed above the air inlet, and the specific position is shown in fig. 5. It will be appreciated that the formaldehyde detection component may alternatively be located below or to the left or right of the air inlet.
In this embodiment, air purifier still includes the air-out grid, and shell 10 still has the air outlet, and the air outlet is located the top of shell, and the air intake is located the lower part of shell, and air outlet department is equipped with air-out grid 40. Wherein. The arrowed lines in fig. 5 indicate the flow direction of the air flow.
In this embodiment, the air purifier further comprises a display component, the controller is electrically connected with the display component, and the controller sends out control signals to independently control and display each component.
Specifically, when the air purifier is started, the controller acquires a starting signal, the detection value of the formaldehyde sensor is read, the detection value is read once every 0.5 second, the read detection value is compared with the last display value, if the difference between the read detection value and the last display value is large, the situation that an interfering substance exists in the environment is judged, the displayed data is controlled to be kept unchanged, the display process can resist the interfering substance from influencing the reading of the formaldehyde sensor, and the experience and the feeling of a user are improved. Wherein, the fact that the difference between the read detection value and the last display value is large means that the absolute value of the difference between the read detection value and the last display value is greater than 0.1mg/m 3 。
If the read detection value and the last display value are not more than 0.1mg/m 3 And judging that the environment is normal. At the moment, the controller reads the rotating speed of the fan, and calculates the time T required for keeping the same display value and detection value according to the rotating speed of the fan.
In the middle process, the displayed value is leveled according to the initial compensation value and the change time T according to the time equal, namely after the time T, the detected value and the displayed value of the formaldehyde sensor are the same (as shown in figures 3 and 4). In the calibration process, the controller transmits the calibrated data to the display component, and the display value is closer to the true value.
In this embodiment, the processor may be a Central Processing Unit (CPU). The Processor may also be other general purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other Programmable logic devices, discrete Gate or transistor logic devices, discrete hardware components, or a combination thereof.
In the present embodiment, the memory, as a non-transitory computer-readable storage medium, may be used to store non-transitory software programs, non-transitory computer-executable programs, and modules.
The memory may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created by the processor, and the like. Further, the memory may include high speed random access memory, and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, the memory optionally includes memory located remotely from the processor, and such remote memory may be coupled to the processor via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The invention also provides a computer readable storage medium, which stores computer instructions, and the instructions are executed by a processor to realize the formaldehyde detection method. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
1. the method has the advantages that the detection value of the formaldehyde sensor is compensated and calibrated aiming at the conditions of different air speeds and different gas diffusion and chemical reaction time under different concentrations, so that the display value is closer to the true value, and the defect of low response speed of formaldehyde display values when the formaldehyde sensor is used for formaldehyde measurement in the prior art is overcome.
2. The detection value is compared with the last display value, if the difference between the detection value and the last display value is large, the fact that interference substances such as alcohol resistance exist in the environment is judged, the displayed data is controlled to be kept unchanged, the displayed data is the reading of the formaldehyde sensor affected by the interference substances, the display value of the formaldehyde sensor still responds under the condition of the interference substances, an anti-interference algorithm is adopted, the user experience is improved, and the defect that the real concentration value of formaldehyde is difficult to accurately reflect under the condition of the interference substances in the prior art is overcome.
3. Through the wind field analysis, design formaldehyde sensor's suitable position, utilize air purifier self circulation wind field for air convection and detection, avoid relying on the problem that natural diffusion detects accurate numerical value time overlength, can accelerate and detect response speed.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (13)
1. The formaldehyde detection method is characterized by comprising the following steps:
acquiring a detection value of a formaldehyde detection part (20);
acquiring the actual rotating speed of the fan;
calculating a compensation value corresponding to the detection value according to the initial detection value of the formaldehyde detection part (20) and the actual rotating speed;
and obtaining a display value corresponding to the detection value according to the detection value and the compensation value.
2. The formaldehyde detection method according to claim 1, wherein the step of calculating a compensation value corresponding to the detection value based on the initial detection value of the formaldehyde detection means (20) and the actual rotation speed comprises:
calculating compensation duration according to the actual rotating speed;
and calculating a compensation value corresponding to the detection value in the compensation time length according to an initial compensation value corresponding to the initial detection value of the formaldehyde detection part (20), a preset final compensation value and the compensation time length.
3. The formaldehyde detection method according to claim 2, wherein the step of calculating the compensation time period according to the actual rotation speed comprises:
acquiring a preset highest rotating speed and a first duration corresponding to the highest rotating speed;
acquiring a preset lowest rotating speed and a second time length corresponding to the lowest rotating speed;
and obtaining the compensation time length corresponding to the actual rotating speed by utilizing the highest rotating speed, the lowest rotating speed, the first time length, the second time length and the actual rotating speed and adopting an interpolation method.
4. The formaldehyde detection method according to claim 2, wherein the step of obtaining the initial compensation value comprises:
acquiring a corresponding relation between a preset interval range and an initial compensation value;
determining an interval range to which the initial detection value belongs;
and obtaining the initial compensation value according to the interval range to which the initial detection belongs and the corresponding relation.
5. The formaldehyde detection method according to claim 3, wherein the step of calculating a compensation value corresponding to the detection value within the compensation period based on an initial compensation value corresponding to an initial detection value of the formaldehyde detection section (20), a preset final compensation value, and the compensation period comprises:
calculating a difference between the initial compensation value and the final compensation value;
obtaining a compensation value corresponding to each moment in the compensation duration according to the difference value and a preset rule;
and obtaining a compensation value corresponding to the detection value in the compensation duration according to the corresponding relation between the detection value and each moment in the compensation duration and the compensation value corresponding to each moment in the compensation duration.
6. The formaldehyde detection method according to any one of claims 2 to 5, wherein after acquiring the actual rotation speed of the fan, the formaldehyde detection method further comprises:
acquiring the working time of a formaldehyde detection component (20) in the current environment;
and when the working time length is less than the compensation time length, executing the step of calculating a compensation value corresponding to the detection value according to the initial detection value of the formaldehyde detection part (20) and the actual rotating speed.
7. The formaldehyde detection method according to any one of claims 1 to 5, wherein after acquiring the actual rotation speed of the fan, the formaldehyde detection method further comprises:
acquiring the last display value of the formaldehyde detection part (20);
and when the absolute value of the difference value between the detection value and the last display value is less than or equal to a preset threshold value, calculating a compensation value corresponding to the detection value according to the initial detection value of the formaldehyde detection part (20) and the actual rotating speed.
8. The formaldehyde detection method according to claim 7, further comprising:
and when the absolute value of the difference value between the detection value and the last display value is larger than the threshold value, taking the last display value as the display value of the formaldehyde detection part (20).
9. A formaldehyde detection device, comprising:
a first acquisition module for acquiring a detection value of the formaldehyde detection part (20);
the second acquisition module is used for acquiring the actual rotating speed of the fan;
a calculating module for calculating a compensation value corresponding to the detection value according to the initial detection value of the formaldehyde detecting part (20) and the actual rotating speed,
and the processing module is used for obtaining a display value corresponding to the detection value according to the detection value and the compensation value.
10. An air purifier, comprising:
a housing (10) having an air inlet;
the formaldehyde detection part is arranged on the shell (10) and is close to the air inlet;
a fan disposed within the housing (10);
the controller comprises a processor and a memory, the processor is electrically connected with the formaldehyde detection component and the fan, and the memory is in communication connection with the processor;
wherein the memory stores instructions executable by the processor to cause the processor to perform the formaldehyde detection method of any of claims 1-8.
11. The air purifier as claimed in claim 10, wherein an air inlet grille (30) is provided at the air inlet, and a distance between the formaldehyde detecting member and the air inlet grille (30) is 15mm to 20 mm.
12. The air cleaner of claim 10, wherein the formaldehyde detection component is disposed above the air inlet.
13. A computer readable storage medium having stored thereon computer instructions, wherein the instructions, when executed by a processor, implement the formaldehyde detection method of any one of claims 1-8.
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