CN111272628A - Air purification equipment and filter screen service life detection method and detection device thereof - Google Patents
Air purification equipment and filter screen service life detection method and detection device thereof Download PDFInfo
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- 238000001514 detection method Methods 0.000 title claims abstract description 162
- 238000004887 air purification Methods 0.000 title claims abstract description 93
- 239000000428 dust Substances 0.000 claims abstract description 200
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- 230000003749 cleanliness Effects 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
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- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D46/00—Filters or filtering processes specially modified for separating dispersed particles from gases or vapours
- B01D46/42—Auxiliary equipment or operation thereof
- B01D46/44—Auxiliary equipment or operation thereof controlling filtration
- B01D46/442—Auxiliary equipment or operation thereof controlling filtration by measuring the concentration of particles
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N15/00—Investigating characteristics of particles; Investigating permeability, pore-volume or surface-area of porous materials
- G01N15/08—Investigating permeability, pore-volume, or surface area of porous materials
- G01N2015/084—Testing filters
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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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- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
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Abstract
The invention discloses air purification equipment and a method and a device for detecting the service life of a filter screen of the air purification equipment, relates to the technical field of filter screen filth blockage detection, and is used for solving the problem that the result of judging the filth blockage degree of the filter screen by adopting a PWM duty ratio is inaccurate. The filter screen service life detection method comprises the following steps: when the service time of the filter screen is within the preset new machine time, acquiring the indoor current dust detection value at every preset time interval; if the plurality of current dust detection values are all in the second dust value range within the initial first collection time and the plurality of current dust detection values are all in the first dust value range within the later second collection time, obtaining the current PWM duty ratio of the fan, and storing the current PWM duty ratio and covering the stored calibrated PWM duty ratio corresponding to the condition that the filter screen is not dirty and blocked; and if the plurality of current dust detection values are all in the first dust value range within the initial second acquisition time, keeping the calibrated current PWM duty ratio corresponding to the stored filter screen which is not dirty and blocked unchanged.
Description
Technical Field
The invention relates to the technical field of filter screen filth blockage detection, in particular to air purification equipment and a filter screen service life detection method and device thereof.
Background
The principle of air purification is through the fan with indoor contaminated air inhale and become clean air through the particulate matter (dust PM2.5) in the filter screen filtered air and blow off the room again, during the particulate matter constantly accumulated the filter screen, along with time lapse, the particulate matter of filter screen accumulation is more and more, and filtration efficiency can be more and more low, finally scrap. Therefore, the dirty and blocked conditions of the filter screen can be known in real time, so that the scrapped filter screen can be replaced in time, and secondary pollution is avoided.
One of the conventional dirty degree determination methods for a filter screen is to determine a dirty degree of the filter screen according to a magnitude relationship between a current PWM (Pulse Width Modulation) duty ratio and a calibrated PWM duty ratio under a condition that a wind speed is kept constant. The principle of the method is that the air output of the fan is determined by the rotating speed of the fan, the rotating speed of the fan is in direct proportion to the driving voltage, the driving voltage is formed by driving a PWM wave through an RC (Resistor-capacitor circuit), the PWM duty ratio is higher, the driving voltage is higher, the motor rotating speed of the fan is higher, when air particulate matters accumulated on the filter screen are more and more, the wind resistance of the fan can be gradually increased, the load is increased, the rotating speed of the motor is reduced, the driving PWM duty ratio needs to be increased for ensuring the original rotating speed, and therefore the driving voltage is increased.
However, since the actual use environment of the air purification apparatus is different from the experimental environment, when the filter screen is completely unclogged, the value of the PWM duty ratio of the air purification apparatus reaching the same wind speed is different from the value of the PWM duty ratio calibrated in the experimental environment, and thus the result of determining the degree of the filth blockage of the filter screen is inaccurate.
Disclosure of Invention
The invention provides air purification equipment and a method and a device for detecting the service life of a filter screen of the air purification equipment, and aims to solve the problem that the result of judging the filth blockage degree of the filter screen by adopting a PWM (pulse width modulation) duty ratio in the prior art is inaccurate.
In order to achieve the purpose, the invention adopts the following technical scheme:
in a first aspect, the present invention provides a filter screen life detection method for an air purification apparatus, the filter screen life detection method including a calibration determination standard step, the calibration determination standard step including the steps of: a detection step: the using time of a filter screen in the air purification equipment is within the preset new machine time, and the current indoor dust detection value is obtained at every preset time interval; a calibration step: if a plurality of current dust detection values obtained within an initial first collection time are all within a second dust value range and a plurality of current dust detection values obtained within a later second collection time are all within a first dust value range, obtaining a current PWM duty ratio of a fan, storing the current PWM duty ratio and covering a calibrated PWM duty ratio corresponding to the condition that a filter screen stored in a storage device of the air purification equipment is not dirty and blocked, wherein any dust value within the first dust value range is lower than any dust value within the second dust value range; a maintaining step: and if the plurality of current dust detection values obtained within the initial second acquisition time are all within the first dust value range, keeping the calibrated current PWM duty ratio which corresponds to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked unchanged.
In a second aspect, the invention provides a filter screen service life detection device, which is used for air purification equipment, wherein the air purification equipment comprises a shell, a fan, a filter screen, a storage device, a timing device and a dust detection device are arranged in the shell, the fan comprises a fan driving circuit, the filter screen is positioned on the air inlet side or the air outlet side of the fan, the storage device is used for storing a calibrated PWM duty ratio corresponding to the condition that the filter screen is not dirty and blocked, the timing device is used for recording the service time of the filter screen, and the dust detection device is used for detecting the current dust detection value contained in indoor air; the filter screen life detection device includes: the communication interface is used for receiving the service time of the filter screen sent by the timing device, receiving the current dust detection value sent by the detection device, receiving the current PWM duty ratio sent by the fan driving circuit and sending the current PWM duty ratio to the storage device; the processor is used for acquiring the indoor current dust detection value at preset time intervals when the service time of a filter screen in the air purification equipment is within the preset new machine time; if a plurality of current dust detection values obtained in the initial first collection time are all in a second dust value range and a plurality of current dust detection values obtained in the later second collection time are all in a first dust value range, obtaining the current PWM duty ratio of the fan, and storing and covering the current PWM duty ratio with a calibration PWM duty ratio corresponding to the condition that a filter screen stored in a storage device of the air purification equipment is not dirty and blocked; and if the plurality of current dust detection values obtained within the initial second acquisition time are all within the first dust value range, keeping the calibrated current PWM duty ratio which corresponds to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked unchanged.
In a third aspect, the invention provides air purification equipment, which comprises a shell, wherein a fan, a filter screen, a storage device, a timing device and a dust detection device are arranged in the shell, the fan comprises a fan driving circuit, the filter screen is positioned on the air inlet side or the air outlet side of the fan, the storage device is used for storing a calibrated PWM duty ratio corresponding to the filter screen which is not dirty and blocked, the timing device is used for recording the service time of the filter screen, and the dust detection device is used for detecting the current dust detection value contained in indoor air; the dust detection device comprises a dust detection device, a fan drive circuit, a storage device, a timing device and a dust detection device, and is characterized by further comprising the filter screen service life detection device in the technical scheme, wherein the filter screen service life detection device is in communication connection with the fan drive circuit, the storage device, the timing device and the dust detection device.
In a fourth aspect, the present invention provides a computer storage medium, where instructions are stored in the computer storage medium, and when the instructions are executed, the method for detecting a lifetime of a filter screen according to the foregoing technical solution is implemented.
According to the air purification equipment, the filter screen service life detection method, the filter screen detection device and the computer storage medium provided by the invention, because the service life of the filter screen is 100% when the filter screen is in the preset new machine time, the indoor current dust detection value is obtained, then according to the range of the indoor current dust detection value or the descending change of the current dust detection value for many times, the calibration voltage corresponding to the condition that the filter screen stored in the air purification equipment is not dirty and blocked is kept unchanged, or the current PWM duty ratio of the fan is obtained, or the current PWM duty ratio is obtained, the current PWM duty ratio is stored and covers the calibration PWM duty ratio corresponding to the condition that the filter screen stored in the air purification equipment is not dirty and blocked, because any dust value in the first dust value range is lower than any dust value in the second dust value range, namely, the condition that the indoor air quality is better when the current dust detection value is in the first dust value range, if a plurality of current dust detection values obtained in the initial first acquisition time are in the second dust value range indicating poor air quality, and a plurality of current dust detection values obtained in the later second acquisition time are reduced to the first dust value range indicating good air quality, the current dust detection values can represent the air quality of the area where the air purification equipment is located, and the current PWM duty ratio is in a stable stage, the current PWM duty ratio is obtained, and the current PWM duty ratio is stored and covers the calibrated PWM duty ratio corresponding to the condition that the filter screen stored in the air purification equipment is not dirty and blocked; if a plurality of current dust detection values obtained within the initial second acquisition time are within a first dust value range indicating better air quality, the air quality of the area where the air purification equipment is located is close to the experimental environment, namely the calibrated PWM duty ratio stored in the air purification equipment is the same as the PWM duty ratio of the fan in actual operation, so that recalibration is not needed, and the calibrated current PWM duty ratio corresponding to the condition that the filter screen stored in the air purification equipment is not dirty and blocked is kept unchanged. Therefore, the method for detecting the service life of the filter screen can correct the PWM duty ratio of the air purification equipment reaching the same wind speed when the filter screen is not dirty and blocked completely when the actual using environment of the air purification equipment is different from the experimental environment of the air purification equipment, so that the value of the calibrated PWM duty ratio is consistent with the actual value, and the result of judging the dirty and blocked degree of the filter screen is more accurate.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart illustrating a method for detecting the lifetime of a filter according to an embodiment of the present invention;
FIG. 2 is a second schematic flow chart of a method for detecting the lifetime of a filter according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of an air purification apparatus and a filter screen life detection device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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, 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; may be a mechanical connection; 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 in specific cases to those skilled in the art.
In the description of the present invention, "and/or" is only one kind of association relationship describing an association object, and means that there may be three kinds of relationships, for example, a and/or B, and may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The filter screen is one of the most important parts in the air purification equipment, and the filter screen can filter or kill air pollutants and effectively improve the air cleanliness.
Referring to fig. 1 and 2, a filter screen life detection method according to an embodiment of the present invention is applied to an air purification apparatus, and includes a calibration determination criterion step that includes the steps of:
a detection step: service time t of filter screen in air purification equipmentsIn the preset new machine time t0Within, every preset time tg0And obtaining the indoor current dust detection value P. The air purification equipment comprises a timing device, a dust detection device and a controller, wherein the timing device can record the service time t of the filter screensThe controller obtains the service time t of the current filter screen from the timing devicesThe preset new machine time t0Can take up to 10 hours; the dust sensor is arranged at an air inlet of the air purification equipment and can detect the current dust detection value in the indoor air, and the controller obtains the indoor dust detection value from the dust detection device; the timing device is also used for acquiring the interval time t of the current dust detection valuegAnd (6) timing.
A calibration step: if the initial first acquisition time tc1A plurality of current dust detection values P obtained in the first acquisition time t are all in a second dust value range P2c2And if the obtained current dust detection values P are all in a first dust value range P1, obtaining the current PWM duty ratio of the fan, storing the current PWM duty ratio and covering the calibrated PWM duty ratio corresponding to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked, wherein any dust value in the first dust value range P1 is lower than any dust value in a second dust value range P2. The air purification equipment comprises a storage device, and the storage device stores a calibrated PWM duty ratio corresponding to the condition that the filter screen is not dirty and blocked in the experimental environment. Specifically, the first acquisition time tc1And a second acquisition time tc2May be the same or different. Taking the same as the above, the first acquisition time tc1And a second acquisition time tc2All for 10 minutes. The controller obtains the current PWM duty ratio from a driving circuit of the fan.
A maintaining step: if the initial second acquisition time tc2And if the obtained current dust detection values P are all in a first dust value range P1, keeping the calibrated current PWM duty ratio corresponding to the condition that the filter screen stored in the air purification equipment is not dirty and blocked unchanged.
The method for detecting the service life of the filter screen provided by the invention has the advantage that the filter screen is in the preset new machine time t0In the method, the service life of the filter screen is 100% at the moment, the controller acquires an indoor current dust detection value P, then controls to keep a calibration voltage corresponding to the filter screen which is stored in the air purification equipment and is not dirty and blocked or acquire a current PWM duty ratio of the fan according to the range of the indoor current dust detection value P or the descending change of the current dust detection value P for a plurality of times, or acquires the current PWM duty ratio, stores and covers the current PWM duty ratio corresponding to the filter screen which is stored in the air purification equipment and is not dirty and blocked, because any dust value in a first dust value range P1 is lower than any dust value in a second dust value range P2, namely the current dust detection value P in the first dust value range P1 indicates that the indoor air quality is better, and the current dust detection value P in the second dust value range P2 indicates that the indoor air quality is poorer, if the initial first acquisition time tc1A plurality of current dust detection values P obtained within a second dust value range P2 indicating poor air quality, followed by a second collection time tc2When the obtained multiple current dust detection values fall into a first dust value range P1 which indicates that the air quality is better, and the current dust detection values P can represent the air quality of the area where the air purification equipment is located and the current PWM duty ratio is in a stable stage, obtaining the current PWM duty ratio P, and storing the current PWM duty ratio P and covering a calibrated PWM duty ratio corresponding to the condition that a filter screen stored in the air purification equipment is not dirty and blocked; if the initial second acquisition time tc2If the obtained current dust detection values P are in a first dust value range P1 indicating that the air quality is better, the air quality of the area where the air purification equipment is located is close to the experimental environment, namely the calibrated PWM duty ratio stored in the air purification equipment is close to the PWM of the fan in actual operationThe duty ratio is the same, so that the calibration is not needed to be carried out again, and the calibration current PWM duty ratio corresponding to the condition that the filter screen stored in the air purification equipment is not dirty and blocked is kept unchanged. Therefore, the method for detecting the service life of the filter screen can correct the PWM duty ratio of the air purification equipment reaching the same wind speed when the filter screen is not dirty and blocked completely when the actual using environment of the air purification equipment is different from the experimental environment of the air purification equipment, so that the value of the calibrated PWM duty ratio is consistent with the actual value, and the result of judging the dirty and blocked degree of the filter screen is more accurate.
Because the wind speed of a fan in the air purification equipment has multiple stages, in order to meet the detection requirement of the air purification equipment with the multiple stages of wind speeds, the calibration step in the filter screen service life detection method of the embodiment of the invention specifically comprises the following steps:
if the initial first acquisition time tc1A plurality of current dust detection values P obtained in the first acquisition time t are all in a second dust value range P2c2And if the obtained current dust detection values P are all in the first dust value range P1, obtaining the current PWM duty ratio and the current wind speed of the fan. The air purification equipment also comprises a wind speed detection device, the wind speed detection device can detect the wind speed of the fan, and the controller obtains the current wind speed of the fan from the wind speed detection device.
And storing the current PWM duty ratio and covering the calibration voltage corresponding to the condition that the filter screen at the current wind speed stored in the storage device of the air purification equipment is not dirty and blocked, controlling the fan to operate at another stage of preset wind speed, and returning to the step of acquiring the current PWM duty ratio of the fan and the current wind speed of the fan until the fan operates at each stage of preset wind speed. The storage device stores calibration voltages corresponding to the non-dirty and non-blocked multi-stage preset wind speed filter screens and preset wind speed grades of the fan.
According to the steps, when the actual use environment of the air purification equipment is different from the experimental environment of the air purification equipment, the current PWM duty ratio corresponding to each level of preset wind speed is calibrated again, so that the service life of the filter screen can be detected when the air purification equipment runs at any wind speed.
Since the air quality in some regions is poor year by year, in order to enable the filter screen life detection method according to the embodiment of the present invention to be applicable to these regions, further, the second dust value range P2 includes a third dust value range and a fourth dust value range, any dust value in the third dust value range is lower than any dust value in the fourth dust value range, that is, the air quality is further classified, the current dust detection value P in the third dust value range indicates that the current air quality is good (may be called as good air quality), the current dust detection value P in the fourth dust value range indicates that the current air quality is poor (may be called as poor air quality), and the current dust detection value P in the third dust value range indicates that the current air quality is good (may be called as good air quality). Therefore, the calibration steps of the embodiment of the present invention specifically include:
if the initial first acquisition time tc1A plurality of current dust detection values P obtained in the method are all in a third dust value range and then are acquired for a second acquisition time tc2A plurality of current dust detection values P obtained in the first dust detection device are all in a first dust value range P1 or initial first collection time tc1A plurality of current dust detection values P obtained in the method are all in a fourth dust value range and then are acquired for a second acquisition time tc2And if the obtained current dust detection values P are all in the third dust value range, obtaining the current PWM duty ratio of the fan, and storing the current PWM duty ratio and covering the calibrated PWM duty ratio corresponding to the condition that the filter screen stored in the air purification equipment is not dirty and blocked.
The control method can be suitable for areas with poor air quality all year round, so that the air purification equipment can accurately detect filth blockage of the filter screen in the areas.
Further, after the calibration step, a step of determining a determination criterion is further included, where the step of determining the determination criterion includes:
and equally dividing the value between the calibrated PWM duty ratio corresponding to the filter screen which is not dirty and blocked and the calibrated PWM duty ratio corresponding to the filter screen which is completely dirty and blocked and stored in the storage equipment of the air purification equipment to obtain a PWM duty ratio table corresponding to the service life of the filter screen from 0-100%.
Because the calibration step is carried out in the previous calibration judgment standard step, a PWM duty ratio table corresponding to the judgment that the service life of the filter screen is from 0-100% needs to be reestablished, and therefore the filter screen at each stage has a corresponding calibration PWM duty ratio. The controller equally divides the PWM duty ratio value between the calibrated PWM duty ratio corresponding to the filter screen which is not dirty and blocked and the calibrated PWM duty ratio corresponding to the filter screen which is completely dirty and blocked and stored in the air purification equipment into 100 parts, so that a PWM duty ratio table corresponding to the filter screen with the service life of 0-100% is obtained, and the PWM duty ratio table is stored in the storage device. Of course, the value between the calibrated PWM duty cycle corresponding to the filter screen not being dirty and the calibrated PWM duty cycle corresponding to the filter screen completely being dirty and blocked stored in the storage device of the air purification apparatus may be equally divided into 4 parts, that is, the PWM duty cycles in different ranges indicate different states of complete dirty and blocked filter screens, serious dirty and blocked filter screens, slight dirty and non-dirty and blocked filter screens.
Optionally, the method for detecting the service life of the filter screen in the embodiment of the present invention further includes a detection step, where the detection step includes:
and acquiring the current PWM duty ratio of the fan.
And searching the service life of the filter screen corresponding to the current PWM duty ratio in the PWM duty ratio table to obtain the current service life of the filter screen.
Optionally, for the case that the air purifying device has different wind speeds, the detecting step may further include:
and acquiring the current PWM duty ratio and the current wind speed of the fan.
And searching the service life of the filter screen corresponding to the current PWM duty ratio and the current wind speed in the PWM duty ratio table to obtain the current service life of the filter screen.
In order to let the user know the service life of the filter screen in time, the detection steps in the embodiment of the present invention further include:
and controlling a display device of the air purification equipment to display the current service life information of the filter screen.
A display device (display screen) is installed on a shell of the air purification equipment, and the controller can control the display device to display text information of the current service life of the filter screen or pattern information used for indicating the service life of the filter screen.
It should be noted that: since the higher the PWM duty ratio, the higher the drive voltage, the PWM duty ratio described above may be replaced with the drive voltage.
Referring to fig. 3, the embodiment of the present invention further includes a filter screen life detection device, which is used for an air purification apparatus, the air purification apparatus includes a housing, and a fan, a filter screen, a storage device, a timing device, and a dust detection device are installed in the housing, wherein the fan includes a fan driving circuit, the filter screen is located on an air inlet side or an air outlet side of the fan, the storage device is used for storing a calibrated PWM duty ratio corresponding to the filter screen that is not dirty and blocked, the timing device is used for recording the service time of the filter screen, and the dust detection device is used for detecting a current dust detection value contained in indoor air; the filter screen service life detection device comprises a communication interface and a processor, wherein the communication interface is used for receiving the service time of the filter screen sent by the timing device, receiving the current dust detection value sent by the dust detection device, receiving the current PWM duty ratio sent by the fan driving circuit and sending the current PWM duty ratio to the storage device; the processor is used for acquiring the indoor current dust detection value at preset time intervals when the service time of the filter screen is within the preset new machine time; if a plurality of current dust detection values obtained in the initial first acquisition time are all in the second dust value range and a plurality of current dust detection values obtained in the later second acquisition time are all in the first dust value range, obtaining the current PWM duty ratio of the fan, and storing the current PWM duty ratio and covering a calibrated PWM duty ratio corresponding to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked; and if the current dust detection values in the initial second acquisition time are all in the first dust value range, keeping the calibrated current PWM duty ratio which corresponds to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked unchanged. Since the technical effect of the filter screen life detection device is the same as that of the filter screen life detection method, the details are not repeated here.
It should be noted that: the storage device may be various memories, such as a RAM (Read-Only Memory), a ROM (Random Access Memory), a hard disk, or a floppy disk; the timing device may be a timer and the dust detection device may be a dust sensor.
Further, the air purification equipment further comprises a wind speed detection device, the wind speed detection device is used for detecting the current wind speed of the fan, the communication interface is also used for receiving the current wind speed sent by the wind speed detection device, and the processor is further used for obtaining the current PWM duty cycle and the current wind speed of the fan if a plurality of current dust detection values obtained within the initial first collection time are all within the second dust value range and a plurality of current dust detection values obtained within the subsequent second collection time are all within the first dust value range; and storing the current PWM duty ratio and covering the calibration voltage corresponding to the condition that the filter screen at the current wind speed stored in the storage device of the air purification equipment is not dirty and blocked, controlling the fan to operate at another stage of preset wind speed, and returning to the step of acquiring the current PWM duty ratio of the fan and the current wind speed of the fan until the fan operates at each stage of preset wind speed.
Further, when the second dust value range includes a third dust value range and a fourth dust value range, and any dust value in the third dust value range is lower than any dust value in the fourth dust value range, the processor is further configured to, if a plurality of current dust detection values obtained within an initial first collection time are all within a third dust value range and a plurality of current dust detection values obtained within a subsequent second collection time are all within the first dust value range, or a plurality of current dust detection values obtained in an initial first collection time are all in a fourth dust value range, and a plurality of current dust detection values obtained in a later second collection time are all in a third dust value range, and acquiring the current PWM duty ratio of the fan, and storing the current PWM duty ratio and covering the calibrated PWM duty ratio corresponding to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked.
Further, the storage device is further used for storing a calibrated PWM duty ratio corresponding to the complete filth blockage of the filter screen, and the processor is further used for equally dividing the value between the calibrated PWM duty ratio corresponding to the complete filth blockage of the filter screen, which is stored in the air purification equipment, and the calibrated PWM duty ratio corresponding to the complete filth blockage of the filter screen, so as to obtain a PWM duty ratio table corresponding to the service life of the filter screen from 0-100%.
In some possible embodiments, the processor is further configured to obtain a current PWM duty ratio of the fan, and search the filter screen life corresponding to the current PWM duty ratio in the PWM duty ratio table to obtain the current life of the filter screen.
Further, the air purification equipment further comprises a display device, and the processor is further used for controlling the display device of the air purification equipment to display the current service life information of the filter screen.
The processor according to the embodiment of the present invention may be a single processor, or may be a general term for multiple processing elements. For example, the processor may be a Central Processing Unit (CPU), an Application Specific Integrated Circuit (ASIC), or one or more Integrated circuits configured to implement embodiments of the present invention. For example: one or more microprocessors (digital signal processors, DSP for short), or one or more Field Programmable gate arrays (FPGA for short).
The embodiment of the invention also comprises air purification equipment which comprises a shell, wherein a fan, a filter screen, a storage device, a timing device and a dust detection device are arranged in the shell, the fan comprises a fan driving circuit, the filter screen is positioned on the air inlet side or the air outlet side of the fan, the storage device is used for storing the calibrated PWM duty ratio corresponding to the condition that the filter screen is not dirty and blocked, the timing device is used for recording the service time of the filter screen, the dust detection device is used for detecting the current dust detection value contained in indoor air, and the air purification equipment also comprises the filter screen service life detection device in the embodiment, and the filter screen service life detection device is in communication connection with the fan driving circuit, the storage device, the timing device. The technical effect that the air purification equipment can achieve is the same as that of the filter screen life detection device, and is not described herein again. The air purification apparatus may be an air conditioner or an air purifier.
The embodiment of the invention also comprises a computer storage medium, wherein the computer storage medium stores instructions, and when the instructions are operated, the filter screen service life detection method in the technical scheme is realized.
Wherein, the computer storage medium can be a Read-Only Memory (ROM) or other types of static storage devices that can store static information and instructions, a Random Access Memory (RAM) or other types of dynamic storage devices that can store information and instructions, an Electrically Erasable Programmable Read-Only Memory (EEPROM), a compact disc Read-Only Memory (CD-ROM) or other optical disc storage, optical disc storage (including compact disc, laser disc, optical disc, digital versatile disc, blu-ray disc, etc.), magnetic disk storage media or other magnetic storage devices, or any other medium that can be used to carry or store desired program code in the form of instructions or data structures and that can be accessed by a computer, but is not limited to such.
Compared with the prior art, the beneficial effects of the computer storage medium provided by the embodiment of the invention are the same as those of the filter screen life detection method, and are not repeated herein.
In the description herein, particular features, structures, materials, or characteristics may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A service life detection method of a filter screen is characterized by being used for air purification equipment, and comprises the following steps of calibrating and judging the standard:
a detection step: the using time of a filter screen in the air purification equipment is within the preset new machine time, and the current indoor dust detection value is obtained at every preset time interval;
a calibration step: if a plurality of current dust detection values obtained within an initial first collection time are all within a second dust value range and a plurality of current dust detection values obtained within a later second collection time are all within a first dust value range, obtaining a current PWM duty ratio of a fan, storing the current PWM duty ratio and covering a calibrated PWM duty ratio corresponding to the condition that a filter screen stored in a storage device of the air purification equipment is not dirty and blocked, wherein any dust value within the first dust value range is lower than any dust value within the second dust value range;
a maintaining step: and if the plurality of current dust detection values obtained within the initial second acquisition time are all within the first dust value range, keeping the calibrated current PWM duty ratio which corresponds to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked unchanged.
2. The filter screen life detection method according to claim 1, wherein the calibration step specifically comprises:
if the plurality of current dust detection values obtained in the initial first collection time are all in a second dust value range, and the plurality of current dust detection values obtained in the later second collection time are all in a first dust value range, obtaining the current PWM duty ratio and the current wind speed of the fan;
and storing the current PWM duty ratio and covering the calibration voltage corresponding to the condition that the current wind speed filter screen stored in the storage device of the air purification equipment is not dirty and blocked, controlling the fan to operate at another level of preset wind speed, and returning to the step of acquiring the current PWM duty ratio of the fan and the current wind speed of the fan until the fan operates at each level of preset wind speed.
3. The method for detecting the service life of the filter screen according to claim 2, wherein the second dust value range includes a third dust value range and a fourth dust value range, any dust value in the third dust value range is lower than any dust value in the fourth dust value range, and the calibrating step specifically includes:
if the plurality of current dust detection values obtained within the initial first collection time are all within a third dust value range, and the plurality of current dust detection values obtained within the subsequent second collection time are all within a first dust value range, or the plurality of current dust detection values obtained within the initial first collection time are all within a fourth dust value range, and the plurality of current dust detection values obtained within the subsequent second collection time are all within a third dust value range, obtaining the current PWM duty ratio of the fan, and storing and covering the current PWM duty ratio with a calibration PWM duty ratio corresponding to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked.
4. The filter screen service life detection method according to any one of claims 1 to 3, further comprising a step of determining a determination criterion after the calibration step, wherein the step of determining the determination criterion comprises:
and equally dividing the value between the calibrated PWM duty ratio corresponding to the filter screen which is not dirty and blocked and the calibrated PWM duty ratio corresponding to the filter screen which is completely dirty and blocked and stored in the storage equipment of the air purification equipment to obtain a PWM duty ratio table corresponding to the service life of the filter screen from 0-100%.
5. The filter screen life detection method according to claim 4, further comprising a detection step, wherein the detection step comprises:
acquiring the current PWM duty ratio of the fan;
and searching the service life of the filter screen corresponding to the current PWM duty ratio in the PWM duty ratio table to obtain the current service life of the filter screen.
6. The filter screen life detection method according to claim 5, wherein the detection step further comprises:
and controlling a display device of the air purification equipment to display the current service life information of the filter screen.
7. A service life detection device of a filter screen is characterized by being used for air purification equipment, wherein the air purification equipment comprises a shell, a fan, the filter screen, a storage device, a timing device and a dust detection device are arranged in the shell, the fan comprises a fan driving circuit, the filter screen is positioned on the air inlet side or the air outlet side of the fan, the storage device is used for storing a calibrated PWM duty ratio corresponding to the condition that the filter screen is not dirty and blocked, the timing device is used for recording the service time of the filter screen, and the dust detection device is used for detecting the current dust detection value contained in indoor air; the filter screen life detection device includes:
the communication interface is used for receiving the service time of the filter screen sent by the timing device, receiving the current dust detection value sent by the detection device, receiving the current PWM duty ratio sent by the fan driving circuit and sending the current PWM duty ratio to the storage device;
the processor is used for acquiring the indoor current dust detection value at preset time intervals when the service time of a filter screen in the air purification equipment is within the preset new machine time; if a plurality of current dust detection values obtained in the initial first collection time are all in a second dust value range and a plurality of current dust detection values obtained in the later second collection time are all in a first dust value range, obtaining the current PWM duty ratio of the fan, and storing and covering the current PWM duty ratio with a calibration PWM duty ratio corresponding to the condition that a filter screen stored in a storage device of the air purification equipment is not dirty and blocked; and if the plurality of current dust detection values obtained within the initial second acquisition time are all within the first dust value range, keeping the calibrated current PWM duty ratio which corresponds to the condition that the filter screen stored in the storage device of the air purification equipment is not dirty and blocked unchanged.
8. The filter screen life detection device according to claim 7, further comprising:
the wind speed detection device is used for detecting the current wind speed of the fan;
the communication interface is also used for receiving the current wind speed sent by the wind speed detection device;
the processor is further configured to obtain a current PWM duty cycle and a current wind speed of the fan if the plurality of current dust detection values obtained within the initial first collection time are all within a second dust value range and the plurality of current dust detection values obtained within the subsequent second collection time are all within a first dust value range; and storing the current PWM duty ratio and covering the calibration voltage corresponding to the condition that the current wind speed filter screen stored in the storage device of the air purification equipment is not dirty and blocked, controlling the fan to operate at another level of preset wind speed, and returning to the step of acquiring the current PWM duty ratio of the fan and the current wind speed of the fan until the fan operates at each level of preset wind speed.
9. An air purification device is characterized by comprising a shell, wherein a fan, a filter screen, a storage device, a timing device and a dust detection device are arranged in the shell, the fan comprises a fan driving circuit, the filter screen is positioned on the air inlet side or the air outlet side of the fan, the storage device is used for storing a calibrated PWM duty ratio corresponding to the filter screen which is not dirty and blocked, the timing device is used for recording the service time of the filter screen, and the dust detection device is used for detecting the current dust detection value contained in indoor air; the dust detection device of claim 7 or 8, wherein the filter screen life detection device is in communication connection with the fan driving circuit, the storage device, the timing device and the dust detection device.
10. A computer storage medium having instructions stored thereon, wherein the instructions, when executed, implement the filter screen life detection method according to any one of claims 1 to 6.
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