A filter screen installation detection method, detection device and air purification equipment

Abstract

The application provides a filter screen installation detection method, a detection device and an air purification equipment. The detection method comprises the following steps: controlling a motor to gradually increase speed in M stages in multiple stages, M >= 2, each stage of the M stages is provided with a corresponding preset acceleration; in each stage of the M stages, controlling the motor to run at the preset acceleration of the corresponding stage for at least N first preset time lengths, recording the motor speed reached by the motor every time the motor passes through a first preset time length, obtaining (M * N) first speeds, N >= 1; in each stage of the M stages, controlling the motor to run at the preset acceleration of the corresponding stage to a target speed of the corresponding stage, recording the first time length required for the motor speed to reach the target speed, obtaining M first time lengths; and judging the filter screen installation according to the (M * N) first speeds and the M first time lengths. The application can detect the filter screen installation from multiple directions and multiple dimensions, so that the filter screen installation detection result is more accurate and the adaptation range is wider.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of air purifiers, and particularly relates to a filter screen installation detection method, a detection device and an air purification device. BACKGROUND

[0002] In the use process of the purifier product, the core component in the air purifier is the filter screen. The fan filters the external air through the filter screen. Over time, a large amount of dust will accumulate on the filter screen or the purification capacity will gradually decrease, and the filter screen needs to be cleaned or replaced. If the user forgets to load the filter screen after taking it out for cleaning or replacing during the use process, the corresponding purification effect will be lost and the use purpose will not be achieved.

[0003] The existing detection methods are mostly to increase detection circuits on the hardware, add electrical equipment, or increase cut-off circuits on the whole machine structure, all of which realize detection on the basis of increasing product development costs, and are somewhat not worth the cost.

[0004] For the purifier product, whether the filter screen is installed has a great influence on the wind resistance brought by the internal air duct, which will inevitably have a certain influence on the speed control of the motor (including the output duty ratio and frequency signal). The influence is great or small:

[0005] ① When the influence is great: the difference in the output duty ratio or frequency signal required by the motor to reach the target speed is large when the filter screen is installed or not, and the output duty ratio or frequency signal at this time can be directly used to judge whether the filter screen is installed;

[0006] ② When the influence is small: the difference in the output duty ratio or frequency signal required by the motor to reach the target speed is small when the filter screen is installed or not, that is, this difference may have the same effect due to changes in some external environment. If the ordinary duty ratio and frequency signal are used for judgment at this time, the probability of misjudging whether the filter screen is installed will be increased.

[0007] Therefore, the present application is proposed. SUMMARY

[0008] The technical problem to be solved by the present application is to overcome the shortcomings of the prior art and provide a filter screen installation detection method, a detection device and an air purification device, which can detect the installation of the filter screen from multiple directions and multiple dimensions, so that the filter screen installation detection result is more accurate and the adaptation range is wider.

[0009] To solve the above technical problems, the present application provides a filter screen installation detection method for an air purification device, which comprises: controlling the motor to gradually increase the speed in M stages, wherein M is greater than or equal to 2, and each of the M stages is provided with a corresponding preset acceleration; in each of the M stages, controlling the motor to run at the preset acceleration of the corresponding stage for at least N first preset time lengths, and recording the motor speed reached by the motor every first preset time length, to obtain (M×N) first speeds, wherein N is greater than or equal to 1; in each of the M stages, controlling the motor to run at the preset acceleration of the corresponding stage to a target speed of the corresponding stage, recording the first time length required for the motor speed to reach the target speed, to obtain M first time lengths; and judging the filter screen installation condition according to the (M×N) first speeds and the M first time lengths.

[0010] Further optionally, the plurality of stages comprises a low speed stage, a low-middle speed stage, a middle speed stage, a middle-high speed stage and a high speed stage, and the preset acceleration of each stage is different.

[0011] Further optionally, the preset acceleration of each of the M stages is a constant acceleration, and the preset accelerations of the M stages gradually increase.

[0012] Further optionally, in each of the M stages, the first preset time length is an interval time length for the motor to adjust the speed at the preset acceleration of the corresponding stage.

[0013] Further optionally, judging the filter screen installation condition according to the (M×N) first speeds and the M first time lengths comprises: determining a filter screen installation determination coefficient according to the (M×N) first speeds and the M first time lengths; and judging the filter screen installation condition according to the filter screen installation determination coefficient.

[0014] Further optionally, the step of determining the filter screen installation determination coefficient according to the (M×N) first speeds and the M first time lengths comprises: calculating the sum of the (M×N) first speeds to obtain a second speed; calculating the sum of the M first time lengths to obtain a second time length; and performing a weighted operation on the second speed and the second time length to obtain the filter screen installation determination coefficient.

[0015] Further optionally, the step of judging the filter screen installation condition according to the filter screen installation determination coefficient comprises: calculating the difference between the filter screen installation determination coefficient and a preset filter screen installation determination coefficient; calculating the ratio of the difference to the preset filter screen installation determination coefficient; judging whether the ratio is greater than a filter screen installation determination fault tolerance; if yes, determining that the filter screen is not installed, and if no, determining that the filter screen is installed.

[0016] Further optionally, before the step of controlling the motor to gradually accelerate for M stages in multiple stages, the detection method further comprises: after the air purification device is powered on, controlling the motor to operate at an initial rotating speed for a second preset time length, so that the motor reaches a stable state.

[0017] The third aspect of the present application provides a filter screen installation detection device for an air treatment device, characterized in that it comprises one or more processors and a non-transitory computer readable storage medium storing program instructions, when the one or more processors execute the program instructions, the one or more processors are used to implement the filter screen installation detection method according to any one of the above technical solutions.

[0018] The fourth aspect of the present application provides an air purification device which adopts the method according to any one of the above technical solutions, or comprises the filter screen installation detection device according to the above technical solution.

[0019] After adopting the above technical solution, the present application has the following beneficial effects compared with the prior art: the present application can detect the filter screen installation from multiple directions and multiple dimensions, uses the influence of the acceleration amplification of the wind resistance size of the filter screen installation on the motor rotating speed control, simultaneously detects the rotating speed of the motor at a specified time and the time length required for the motor to reach the set rotating speed in stages and steps, takes into account both to calculate the filter screen installation judgment coefficient, so as to judge the filter screen installation, which can make the detection method more general (adapt to different control duty ratio and control frequency motors), especially suitable for the case where the filter screen installation has little influence on the wind resistance, and make the detection result more accurate. In addition, the whole machine filter screen installation is detected by using the software control + algorithm detection mode, which can cancel the cost of increasing hardware and other peripheral devices, thereby reducing the product development cost and improving the competitiveness of the product.

[0020] The specific embodiments of the present application will be described in further detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are part of the present application and serve to provide a further understanding of the present application, the illustrative embodiments of the present application and their descriptions serve to explain the present application, but do not constitute an improper limitation on the present application. Obviously, the accompanying drawings in the following description are only some embodiments, and other drawings can be obtained by those skilled in the art without creating laborious work. In the drawings:

[0022] Figure 1 One of the flowcharts of the filter screen installation detection method of the embodiment of the present application is shown.

[0023] Figure 2 The second flowchart of the filter screen installation detection method of the embodiment of the present application is shown.

[0024] Figure 3 Fig. 3 shows a flow diagram of the filter screen installation detection method according to an embodiment of the present application.

[0025] Figure 4 Fig. 4 shows a diagram of the filter screen installation detection according to an embodiment of the present application.

[0026] Figure 5 Fig. 5 shows a diagram of the filter screen installation detection according to an embodiment of the present application.

[0027] Figure 6 Fig. 6 shows a flow diagram of the filter screen installation detection method according to an embodiment of the present application.

[0028] Figure 7 Fig. 7 shows a diagram of the filter screen installation detection according to an embodiment of the present application.

[0029] Wherein: 10 is a first filter screen, 11 is a first tray, 20 is a second filter screen, 21 is a second tray, 30 is an air outlet, and 31 is a fan.

[0030] It should be noted that the drawings and the detailed description are not intended to limit the scope of the concept of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0031] In the description of the present application, it should be noted that the terms "inner", "outer", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection", "contact", "communication" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0033] Embodiment one

[0034] Figure 1 Fig. 1 shows a flow diagram of the filter screen installation detection method according to an embodiment of the present application. As shown in the figure, the detection method comprises: Figure 1

[0035] ​In step 101, the motor is controlled to accelerate in M stages in multiple stages, where M≥2, and each of the M stages is provided with a corresponding preset acceleration;

[0036] In step 102, in each of the M stages, the motor is controlled to run at the preset acceleration of the corresponding stage for at least N first preset time lengths, and the motor speed reached by the motor every time a first preset time length is recorded, obtaining (M×N) first speeds, where N≥1;

[0037] In step 103, in each of the M stages, the motor is controlled to run at the preset acceleration of the corresponding stage to the target speed of the corresponding stage, and the first time length required for the motor speed to reach the target speed is recorded, obtaining M first time lengths;

[0038] In step 104, (M×N) first speeds and M first time lengths are used to judge the filter screen installation.

[0039] The filter screen installation detection method provided in the embodiment first controls the motor to accelerate in M stages in multiple stages, where M≥2, and each of the M stages is provided with a corresponding preset acceleration, thereby enriching the detection dimension of the motor speed. Then the motor speed is detected from two directions. Specifically, in the first detection stage, in each of the M stages, the motor is accelerated at the preset acceleration of the corresponding stage, and the motor speed is detected every first preset time length, obtaining (M×N) motor speeds (referred to as first speeds). In the second detection stage, also in each of the M stages, the motor is accelerated at the preset acceleration of the corresponding stage, and the difference is that in each stage, the time length required for the motor speed to reach the target speed of the corresponding stage is detected, obtaining M detection time lengths (referred to as first time lengths). The (M×N) first speeds and M first time lengths detected in the above two detection stages are used to judge the filter screen installation, which can make the detection method more general, thereby adapting to different control duty cycles and control frequency motors, especially for cases where the installation of the filter screen has little effect on the wind resistance, and the detection result is more accurate. In addition, the software control + algorithm detection method is used to detect whether the filter screen of the whole machine is installed, which can cancel the cost of increasing hardware and other peripheral devices, thereby reducing the product development cost and improving the competitiveness of the product.

[0040] Further optionally, the multiple stages include but are not limited to a low speed stage, a low-middle speed stage, a middle speed stage, a middle-high speed stage, and a high speed stage; and the preset acceleration of each stage is different. Thus, the detection method can be expanded in multiple dimensions and multiple directions, which can make the filter screen installation detection algorithm result more accurate and the adaptation range wider.

[0041] Further optionally, the preset acceleration of each of the M stages is constant acceleration, and the preset accelerations of the M stages increase stage by stage.

[0042] The constant acceleration in the motor speed control process corresponds to actual motor control, that is, the control program gradually adjusts the same amplitude duty ratio or frequency within a fixed time length. For example, if the actual program can control the duty ratio range of 10% to 90% or the frequency controllable range of 80 Hz to 500 Hz, the program can be controlled to increase the duty ratio by 1% or the frequency by 1 Hz within the first preset time length, so as to realize the control of the motor running at constant acceleration.

[0043] In the embodiment, the preset acceleration of each of the M stages is constant acceleration, and the preset accelerations of the M stages increase stage by stage, which can expand the detection mode in multiple dimensions and multiple directions under the premise of stable motor operation, so that the filter screen installation detection algorithm result is more accurate and the adaptation range is wider.

[0044] Further optionally, in each of the M stages, the first preset time length is an interval time length for the motor to adjust the speed at the preset acceleration corresponding to the stage.

[0045] In the embodiment, in the first detection stage, in each of the M stages, the motor is controlled to run at the preset acceleration corresponding to the stage for N first preset time lengths, and the first preset time length is an interval time length for the motor to adjust the speed at the preset acceleration.

[0046] Figure 2 A flowchart of a filter screen installation detection method according to an embodiment of the application is shown in FIG. 2. As shown in FIG. 2, the detection method comprises the following steps. Figure 2

[0047] Step 201: Control the motor to gradually increase the speed in M stages, where M≥2, and the preset acceleration of each of the M stages is different.

[0048] Step 202: In each of the M stages, control the motor to run at the preset acceleration corresponding to the stage for at least N first preset time lengths, and record the motor speed reached by the motor after each first preset time length, to obtain (M×N) first speeds, where N≥1.

[0049] Step 203: In each of the M stages, control the motor to run at the preset acceleration corresponding to the stage to the target speed of the corresponding stage, record the first time length required for the motor speed to reach the target speed, and obtain M first time lengths.

[0050] Step 204: Determine the filter screen installation determination coefficient according to the (M×N) first speeds and the M first time lengths. ​

[0051] Step 205, judging the filter screen installation condition according to the filter screen installation judgment coefficient.

[0052] In this embodiment, the (MxN) first rotation speeds and the M first time lengths can be converted into the filter screen installation judgment coefficient according to certain rules, so as to judge the filter screen installation condition. This method is simple, reliable and easy to implement.

[0053] Figure 3 Fig. 3 shows a flowchart of a third embodiment of the filter screen installation detection method of the present application. As shown in Fig. 3, the detection method comprises the following steps. Figure 2

[0054] Step 301, controlling the motor to gradually accelerate in M stages, wherein M≥2, and the preset acceleration of each stage is different;

[0055] Step 302, in each stage, controlling the motor to run at the preset acceleration of the corresponding stage for at least N first preset time lengths, and recording the motor rotation speed reached by the motor after each first preset time length, to obtain (MxN) first rotation speeds, wherein N≥1;

[0056] Step 303, in each stage, controlling the motor to run at the preset acceleration of the corresponding stage to the target rotation speed of the corresponding stage, recording the first time length required for the motor rotation speed to reach the target rotation speed, to obtain M first time lengths;

[0057] Step 304, calculating the sum of the (MxN) first rotation speeds to obtain a second rotation speed; calculating the sum of the M first time lengths to obtain a second time length;

[0058] Step 305, performing weighted operation on the second rotation speed and the second time length to obtain a filter screen installation judgment coefficient;

[0059] Step 306, calculating the difference between the filter screen installation judgment coefficient and a preset filter screen installation judgment coefficient; calculating the ratio of the difference to the preset filter screen installation judgment coefficient;

[0060] Step 307, judging whether the ratio is greater than a filter screen installation judgment fault tolerance; if yes, executing Step 308, and if no, executing Step 309;

[0061] Step 308, determining that the filter screen is not installed;

[0062] Step 309, determining that the filter screen is installed.

[0063] ​In this embodiment, considering that the wind resistance is small and the relative load is small without the filter screen, the statistical first rotation speed is relatively large under the same acceleration condition, the rotation speed is relatively fast, and the first time length spent to reach the set rotation speed is small, different weights are allocated to the two stages, and the filter screen installation determination coefficient calculated by taking both into account can accurately determine whether the filter screen is installed.

[0064] The preset filter screen installation determination coefficient is an air purification equipment factory default filter screen installation determination coefficient, which is used as a reference for determination.

[0065] The second rotation speed and the second time length are subjected to a weighted operation to obtain the filter screen installation determination coefficient, and the calculation is specifically performed according to the following formula: S=a×V+b×T; wherein V is the second rotation speed, T is the second time length, a is the weight coefficient of the second rotation speed, and b is the weight coefficient of the second time length.

[0066] It should be noted that a+b=1, and a and b are not completely constant fixed constants, and the main purpose is to take into account the influence of the first detection stage and the second detection stage, especially the first detection stage is the rotation speed component, and the value is relatively large, while the second detection stage is the time component, and the value is relatively small. Therefore, the determination of the weight coefficients of different stages needs to be balanced to determine the relative balance coefficients of the weight coefficients of the embodiments of the present application, which are obtained through test verification.

[0067] Further optionally, the step of determining the filter screen installation condition according to the filter screen installation determination coefficient comprises: calculating the difference between the filter screen installation determination coefficient and the preset filter screen installation determination coefficient; calculating the ratio of the difference to the preset filter screen installation determination coefficient; determining whether the ratio is greater than the filter screen installation determination tolerance; if yes, determining that the filter screen is not installed, and if no, determining that the filter screen is installed.

[0068] In this embodiment, the filter screen installation determination tolerance is designed. The filter screen density of the purifier product may be affected by some external environment or pulling during the use of the filter screen during the operation process, which may affect the wind resistance of the product. In addition, the influence of the filter screen on the wind resistance is particularly large, so this parameter mainly serves as the allowable error range of the determination condition. By calculating the difference between the filter screen installation determination coefficient and the preset filter screen installation determination coefficient, calculating the ratio of the difference to the preset filter screen installation determination coefficient, and determining whether the ratio is greater than the filter screen installation determination tolerance, it can be determined whether the filter screen is installed. When the ratio is greater than the filter screen installation determination tolerance, it is considered that the filter screen is not installed, and vice versa, when the ratio is less than or equal to the filter screen installation determination tolerance, it is considered that the filter screen is installed.

[0069] Further optionally, before the step of controlling the motor to gradually accelerate in M stages of multiple stages, the detection method further comprises: after the air purification device is powered on, controlling the motor to operate at an initial rotating speed for a second preset time length, so that the motor reaches a stable state.

[0070] In this embodiment, the filter screen installation detection method further comprises a pretreatment stage on the basis of the first detection stage, the second detection stage and the determination stage. In the pretreatment stage, the motor is controlled to operate at an initial rotating speed for a period of time after the whole machine is operated, so as to ensure that the motor operates stably. The subsequent detection processing is carried out on the premise that the motor operates stably, which can ensure the accuracy of the detection result. Further, the initial rotating speed is the lowest rotating speed of the detection logic, by which the subsequent detection calculation can be conveniently carried out.

[0071] As shown in Figure 4 and Figure 5 , they are schematic diagrams before and after the installation of the filter screen. As can be seen, Figure 4 two filter screens, a first filter screen 10 and a second filter screen 20, are installed in the air purification device. The fan 31 and the air outlet 30 can be seen, and the airflow direction is from bottom to top. Figure 5 In

[0072] It is worth noting that Figure 4 and Figure 5 two filter screens are installed, which does not mean that the method of the present disclosure is only applicable to air purification devices with two filter screens. Instead, the present disclosure can detect the installation of filter screens of air purification devices with multiple filter screens.

[0073] The following relevant symbols are parameter symbols related to the following embodiments of the present disclosure:

[0074] T int --motor pretreatment stage running time, to ensure that the motor operates stably before detection;

[0075] V int --initial rotating speed reached by the motor in the pretreatment stage;

[0076] T judge --interval time for acceleration adjustment in the motor rotating speed control process;

[0077] V judend --rotating speed reached by the motor after each T judge ;

[0078] V target --target rotating speed in the motor rotating speed adjustment process;

[0079] a const --constant acceleration in the motor rotating speed control process.

[0080] a min --motor speed control minimum acceleration; a mid --motor speed control medium acceleration; a max --motor speed control maximum acceleration;

[0081] β--filter installation determination fault tolerance;

[0082] §--filter installation determination coefficient, which is calculated through the previous data processing, and the final determination of filter installation is made through this parameter;

[0083] ɡ--air purification equipment factory default filter installation determination coefficient, i.e. preset filter installation determination coefficient, which is used as a reference for determination.

[0084] The filter installation detection method of the present application will be described in detail below. Figure 6 、 Figure 7 The filter installation detection method of the present application will be described in detail below.

[0085] As shown in the drawings, the detection method of the present embodiment includes a basic step, which is filter installation recognition parameter factory self-calibration. In this stage, the detection steps provided by each embodiment of the present application are run at the factory to determine and record the initial parameters of the filter installation detection method, which can be used as a reference for judgment in the subsequent use process. Figure 6 As shown in the drawings, the detection method of the present embodiment includes a basic step, which is filter installation recognition parameter factory self-calibration. In this stage, the detection steps provided by each embodiment of the present application are run at the factory to determine and record the initial parameters of the filter installation detection method, which can be used as a reference for judgment in the subsequent use process.

[0086] Figure 6 As shown in the drawings, the detection method of the present embodiment includes a basic step, which is filter installation recognition parameter factory self-calibration. In this stage, the detection steps provided by each embodiment of the present application are run at the factory to determine and record the initial parameters of the filter installation detection method, which can be used as a reference for judgment in the subsequent use process.

[0087] 1. Pretreatment stage

[0088] After the whole machine works, the motor is controlled at a constant speed V int runs for T int time to ensure stable motor operation for subsequent processing. At the same time, the constant speed is basically the lowest speed of the detection logic, which can be used for subsequent detection calculation.

[0089] 2. First detection stage

[0090] On the basis of the initial speed V int , the motor is controlled at an initial acceleration a const to adjust the output duty cycle or frequency signal, and after a continuous T judge adjustment time, the speed feedback of the motor is detected. Each V judge is recorded during each T judend adjustment time. ​

[0091] 3. Second detection stage

[0092] Also in the initial rotation speed V int , the motor is controlled with the initial acceleration a const to adjust the output duty ratio and frequency signal, and detect whether it reaches the preset target rotation speed V targe . judge The time spent T judge , V judend is calculated, and the determination coefficient of the filter installation detection is calculated, and finally the product filter installation is determined according to the determination coefficient and the fault tolerance.

[0093] 4. Comparison and determination stage

[0094] In this stage, the determination coefficient of the filter installation detection is calculated by the T judge , V judend statistically counted in the first detection stage and the second detection stage, and finally the product filter installation is determined according to the determination coefficient and the fault tolerance.

[0095] The detection process is as follows:

[0096] In the first detection stage and the second detection stage, low-mid-high three rotation speed stages are introduced, and three different levels of preset acceleration a min , a mid and a max are introduced, where a min < a mid < a max . That is, in the low rotation speed stage, a min is used for acceleration, in the mid rotation speed stage, a mid is used for acceleration, and in the high rotation speed stage, a max is used for acceleration.

[0097] After the pretreatment stage, in the first detection stage, in each of the low-mid-high three rotation speed stages, the motor is accelerated with the corresponding preset acceleration, and the rotation speed V judge (ie the first preset time length) is recorded once every T judend (ie the first time length) after the motor reaches the rotation speed V judend-min , V judend-mid , V judend-max is accumulated, and the cumulative time length corresponding to the stage can be obtained. The cumulative rotation speed of the three stages is V target .

[0098] In the second detection stage, low-mid-high three rotation speed stages are introduced, and three corresponding target rotation speeds V judge are introduced. In each of the low-mid-high three rotation speed stages, the motor is accelerated with the corresponding preset acceleration, and the first time length required for the motor to reach the corresponding target rotation speed is recorded. Because the motor passes T judgeAdjust the speed of the motor, so the first duration of the motor to reach the target speed can be converted into how many T judge The duration of the three stages is T judge-min , T judge-mid , and T judge-max , respectively.

[0099] In the comparison determination stage, the specific calculation method is as follows:

[0100] §=(V judend-min +V judend-mid +V judend-max )×0.65+(T judge-min +T judge-mid +T judge-max )×0.35;

[0101] Wherein, § is the filter installation determination coefficient, V judend-min is the sum of N first speeds detected in the low speed stage, V judend-mid is the sum of N first speeds detected in the medium speed stage, V judend-max is the sum of N first speeds detected in the high speed stage, T judge-min is the first duration recorded in the low speed stage, T judge-mid is the first duration recorded in the medium speed stage, and T judge-max is the first duration recorded in the high speed stage.

[0102] Filter installation determination:

[0103] Not installed: ((§-ɡ) / ɡ)>β, otherwise it is determined to be installed.

[0104] In another embodiment of the present application, as shown in Figure 7 , five different speed stages are set, namely low speed, low-medium speed, medium speed, medium-high speed, and high speed. Five different levels of acceleration (a1, a2, a3, a4, a5) are introduced, corresponding to the five speed stages. In addition, three determination coefficients of the filter in different installation states are given, which are the factory default unloaded filter coefficient γ, the factory default loaded filter coefficient g, and the air outlet plugging coefficient ζ, and the curve relationship of the three is given. In the first detection stage, N samples are taken in each speed stage, and the sampling interval time is T judge .

[0105] Specifically, after the pretreatment stage, the motor speed can be controlled to rise to different speed intervals, and a1, a2, a3, a4, and a5 five accelerations will be run in the first detection stage and the second detection stage, and the corresponding V judend , T judgeAnd finally, the parameters are weighted and calculated to obtain a filter installation determination coefficient, and the filter installation determination coefficient and the default filter loaded coefficient g are used to determine the filter installation.

[0106] The third aspect of the present application provides a filter installation detection device for an air treatment device, characterized in that it comprises one or more processors and a non-transitory computer-readable storage medium storing program instructions, and when the one or more processors execute the program instructions, the one or more processors are configured to implement the filter installation detection method according to any one of the above technical solutions.

[0107] The fourth aspect of the present application provides an air purification device adopting the method according to any one of the above technical solutions or comprising the filter installation detection device according to the above technical solution.

[0108] The present application is based on the inherent torque, speed, voltage, and current control characteristics of the motor, and uses acceleration amplification to amplify the influence of the size of the air resistance of the filter on the motor speed control. At the same time, the filter installation is detected and recognized through a software detection algorithm in stages and steps, which can expand the detection method in multiple dimensions and directions, and make the filter installation detection algorithm result more accurate and the adaptation range wider. The software control + algorithm detection method is used to detect whether the filter is installed in the whole machine, which can cancel the cost of adding hardware and other peripheral devices, thereby reducing the product development cost and improving the competitiveness of the product.

[0109] The device embodiments described above are only schematic, wherein the units described as separate components can or can not be physically separated, and the components displayed as units can or can not be physical units, i.e., they can be located in one place, or distributed on multiple network units. Part or all of the modules can be selected according to actual needs to achieve the purpose of the present embodiment. Those skilled in the art can understand and implement it without creative labor.

[0110] From the above description of the embodiments, those skilled in the art can clearly understand that the embodiments can be realized by means of software and the necessary general hardware platform, and of course, they can also be realized by hardware. Based on such understanding, the above technical solutions can be embodied in the form of a software product, which can be stored in a computer readable storage medium, such as ROM / RAM, magnetic disk, optical disk, etc., and includes a number of instructions to make a computer device (which can be a personal computer, a server, or a network device, etc.) execute the methods described in each embodiment or some parts of the embodiments.

[0111] The above merely describes the preferred embodiments of the present application, and is not intended to limit the present application in any form. Although the present application has been disclosed with the preferred embodiments as above, it is not intended to limit the present application, and any skilled person in the art can make some changes or modifications to the above-mentioned technical content with the above-mentioned prompt as equivalent embodiments with equivalent changes, but as long as it does not deviate from the technical solution of the present application, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present application are still within the scope of the present application.

Claims

1. A filter screen installation detection method for an air cleaning apparatus provided with a motor driving a fan to operate, characterized by, The detection method comprises: controlling the motor to accelerate in M stages in multiple stages, wherein M≥2, each stage of the M stages is provided with a corresponding preset acceleration; in each stage of the M stages, controlling the motor to run at a preset acceleration corresponding to the stage for at least N first preset time lengths, and recording the motor speed reached by the motor every time the motor passes through one of the first preset time lengths, to obtain (M×N) first speeds, wherein N≥1; in each stage of the M stages, controlling the motor to run at a preset acceleration corresponding to the stage to a target speed corresponding to the stage, recording the first time length required for the motor speed to reach the target speed, to obtain M first time lengths; judging the filter screen installation condition according to the (M×N) first speeds and the M first time lengths; the step of judging the filter screen installation condition according to the (M×N) first speeds and the M first time lengths comprises: determining a filter screen installation judgment coefficient according to the (M×N) first speeds and the M first time lengths; judging the filter screen installation condition according to the filter screen installation judgment coefficient; the step of determining a filter screen installation judgment coefficient according to the (M×N) first speeds and the M first time lengths comprises: calculating the sum of the (M×N) first speeds to obtain a second speed; calculating the sum of the M first time lengths to obtain a second time length; performing weighted operation on the second speed and the second time length to obtain the filter screen installation judgment coefficient.

2. The filter screen installation detection method according to claim 1, wherein the multiple stages comprise a low speed stage, a low-middle speed stage, a middle speed stage, a middle-high speed stage and a high speed stage; the preset acceleration of each stage is different.

3. The filter screen installation detection method according to claim 1, wherein the preset acceleration of each stage of the M stages is a constant acceleration, and the preset acceleration of the M stages increases stage by stage.

4. The filter screen installation detection method according to claim 1, wherein in each stage of the M stages, the first preset time length is an interval time length for the motor to adjust the speed at a preset acceleration corresponding to the stage.

5. The screen installation detection method according to any one of claims 1 to 4, characterized by, the step of judging the filter screen installation condition according to the filter screen installation judgment coefficient comprises: calculating the difference between the filter screen installation judgment coefficient and a preset filter screen installation judgment coefficient; calculating the ratio of the difference to the preset filter screen installation judgment coefficient; judging whether the ratio is greater than a filter screen installation judgment fault tolerance rate; if yes, it is determined that the filter screen is not installed, and if no, it is determined that the filter screen is installed.

6. The screen installation detection method according to claim 5, wherein Before the step of controlling the motor to accelerate in M stages in multiple stages, the filter screen installation detection method further comprises: after the air purification device is started, controlling the motor to run at an initial speed for a second preset time length, so that the motor reaches a stable state.

7. A filter screen installation detection device for an air handling device, characterized by, It comprises one or more processors and a non-transitory computer readable storage medium having stored program instructions that, when executed by the one or more processors, cause the one or more processors to implement the filter screen installation detection method according to any one of claims 1 to 6.

8. An air cleaning apparatus, characterized by, It adopts the method according to any one of claims 1 to 6, or comprises the filter screen installation detection device according to claim 7.

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