CN113586296B - Method and device for predicting residual life of air filter and storage medium - Google Patents
Method and device for predicting residual life of air filter and storage medium Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 35
- 239000002245 particle Substances 0.000 claims abstract description 63
- 239000013618 particulate matter Substances 0.000 claims description 48
- 238000004590 computer program Methods 0.000 claims description 3
- 208000033748 Device issues Diseases 0.000 claims 1
- 239000003570 air Substances 0.000 description 162
- 238000012360 testing method Methods 0.000 description 7
- 239000012080 ambient air Substances 0.000 description 5
- 206010011906 Death Diseases 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M35/00—Combustion-air cleaners, air intakes, intake silencers, or induction systems specially adapted for, or arranged on, internal-combustion engines
- F02M35/02—Air cleaners
- F02M35/08—Air cleaners with means for removing dust, particles or liquids from cleaners; with means for indicating clogging; with by-pass means; Regeneration of cleaners
- F02M35/09—Clogging indicators ; Diagnosis or testing of air cleaners
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B77/00—Component parts, details or accessories, not otherwise provided for
- F02B77/08—Safety, indicating, or supervising devices
- F02B77/083—Safety, indicating, or supervising devices relating to maintenance, e.g. diagnostic device
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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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
- Y02A50/2351—Atmospheric particulate matter [PM], e.g. carbon smoke microparticles, smog, aerosol particles, dust
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Abstract
The invention relates to the technical field of air filters, and particularly discloses a method and a device for predicting the residual life of an air filter and a storage medium, wherein the method for predicting the residual life of the air filter comprises the steps of obtaining the mass of particles filtered by the air filter in the current unit time, the current front-back pressure difference of the air filter and the front-back pressure difference of the air filter when the service life of the air filter is finished; and the residual service life of the air filter is determined based on the difference between the front-back pressure difference and the current front-back pressure difference when the service life of the air filter is over and the mass of the filtered particles in unit time, and the residual service life of the air filter can be accurately estimated.
Description
Technical Field
The invention relates to the technical field of air filters, in particular to a method and a device for predicting the residual life of an air filter and a storage medium.
Background
Air cleaners, which are an important part of an engine intake air cleaning system, filter out most of the dust particles in the air and allow sufficient clean air to enter the cylinders. The multi-stage air filter has the advantages that the multi-stage air filter is used for filtering air entering the diesel engine cylinder, the quality of the air entering the diesel engine cylinder is guaranteed, premature wear and strain of parts such as a cylinder sleeve and a piston are reduced, vehicles can be normally used in areas with frequent dust, and the service life of the diesel engine is prolonged.
At present, the maintenance mode of the air filter still adopts the traditional mode of replacing the air filter regularly, and one mode is to predict according to experience, and the air filter is replaced every year or every two years for common urban vehicles. The other is to change the driving kilometers according to the recommendation on the manufacturer maintenance manual, generally 10000-15000 kilometers, and the two modes have certain hysteresis and uncertainty due to uncertain environment of the vehicle using place.
Disclosure of Invention
The invention aims to: the method and the device for predicting the residual service life of the air filter and the storage medium are provided to solve the problem that whether the air filter needs to be replaced cannot be accurately predicted in the related technology.
In one aspect, the present invention provides a method for predicting a remaining life of an air cleaner, including:
acquiring the mass of particles filtered by the air filter in the current unit time; acquiring the current front-back pressure difference of the air filter; acquiring the front-back pressure difference of the air filter when the service life of the air filter is finished;
and determining the residual life of the air filter based on the difference value between the front-back pressure difference at the end of the life of the air filter and the current front-back pressure difference and the mass of the filtered particles in the unit time.
As a preferred technical solution of the method for predicting the remaining life of the air cleaner, the step of obtaining the mass of particles filtered by the air cleaner per unit time includes:
acquiring a particulate matter concentration parameter of the air filter in currently sucked air;
acquiring the current air inflow per unit time of the air filter;
and determining the mass of the filtered particles in the unit time based on the particle concentration parameter and the air intake amount in the unit time.
As a preferred technical solution of the method for predicting the remaining life of the air cleaner, the obtaining of the parameter of the concentration of particulate matter in the currently inhaled air by the air cleaner includes:
acquiring a first particulate matter concentration of a current environment;
acquiring an air quality index of the current environment;
determining a second particulate matter concentration based on the air quality index of the current environment;
the larger of the first particulate matter concentration and the second particulate matter concentration is taken as the particulate matter concentration parameter.
As a preferable technical solution of the method for predicting the remaining life of the air cleaner, the determining the second particulate matter concentration based on the air quality index of the current environment includes:
obtaining a corresponding relation model of the current air quality index and the particulate matter concentration;
and inputting the air quality index into the corresponding relation model, and outputting a second particulate matter concentration by the corresponding relation model.
As a preferable technical solution of the method for predicting the remaining life of an air cleaner, the formula for determining the mass of the particles filtered per unit time based on the particle concentration parameter and the intake air amount per unit time is as follows:
wherein m is Δt Is the mass of the particles filtered in unit time, Δ t is the time period, C is the concentration parameter of the particles, V Δt Is the amount of intake air in the period.
As a preferred technical solution of the method for predicting the remaining life of an air cleaner, a formula for determining the remaining life of the air cleaner based on a difference between a previous-subsequent pressure difference at the end of the life of the air cleaner and a current previous-subsequent pressure difference, and the mass of particles filtered in the unit time is as follows:
wherein t is the remaining life of the air cleaner, K is the coefficient, P b Is the pressure difference, P, before and after the end of the life of the air cleaner Δt Is the current front-back pressure difference of the air filter, C is the particle concentration parameter of the current environment, m Δt Is the mass of particles filtered during the air filter period.
As a preferable technical solution of the method for predicting the remaining life of the air cleaner,
m is the mass of particles filtered by the air cleaner from the beginning to the end of its life, P a Is the differential pressure before and after the beginning of the filter life.
As a preferred technical scheme of the method for predicting the residual service life of the air filter, whether the residual service life of the air filter is smaller than a set value or not is judged, and if yes, an alarm device gives an alarm.
The present invention also provides an air cleaner remaining life predicting device, including:
the information acquisition module is used for acquiring the mass of particles filtered by the air filter in the current unit time;
the current pressure difference acquisition module is used for acquiring the current front-back pressure difference of the air filter;
the service life ending pressure difference acquisition module is used for acquiring the front-back pressure difference of the air filter when the service life is ended;
and the residual life determining module is used for determining the residual life of the air filter based on the difference value between the front-back pressure difference and the current front-back pressure difference at the end of the service life of the air filter and the mass of the filtered particles in the unit time.
The present invention also provides a storage medium having stored thereon a computer program that, when executed by a vehicle controller, implements the air cleaner remaining life prediction method as described in any one of the above aspects.
The invention has the beneficial effects that:
the invention provides a method and a device for predicting the residual life of an air filter and a storage medium, wherein the method for predicting the residual life of the air filter is characterized in that the mass of particles filtered by the air filter in the current unit time, the current front-back pressure difference of the air filter and the front-back pressure difference of the air filter when the service life of the air filter is finished are obtained; and the residual service life of the air filter is determined based on the difference value between the front-back pressure difference and the current front-back pressure difference when the service life of the air filter is finished and the mass of the filtered particles in unit time, so that the residual service life of the air filter can be accurately estimated.
Drawings
FIG. 1 is a first schematic structural diagram illustrating a method for predicting remaining life of an air cleaner according to an embodiment of the present disclosure;
FIG. 2 is a schematic structural diagram of a method for predicting remaining life of an air cleaner according to an embodiment of the present invention;
FIG. 3 is a third schematic structural diagram illustrating a method for predicting remaining life of an air cleaner according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of a remaining life prediction structure of an air cleaner according to an embodiment of the present invention.
In the figure:
100. an information acquisition module; 200. a current differential pressure acquisition module; 300. an end-of-life differential pressure acquisition module; 400. and a remaining life determining module.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it is to be understood 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 the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Where the terms "first position" and "second position" are two different positions, and where a first feature is "over", "above" and "on" a second feature, it is intended that the first feature is directly over and obliquely above the second feature, or simply means that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
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 and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the accompanying drawings are illustrative only for the purpose of explaining the present invention, and are not to be construed as limiting the present invention.
Example one
As shown in fig. 1 to 3, the present embodiment provides an air filter remaining life prediction method, which is applicable to predicting the remaining life of an air filter, and which may be implemented by an air filter remaining life prediction device, which may be implemented by software and/or hardware and integrated in a vehicle, specifically, the air filter remaining life prediction method includes the following steps:
s110: and acquiring the mass of the particles filtered by the air filter in the current unit time.
The air filter can be used for filtering most of particles in air, enough clean air can enter the air cylinder, and the air filter can be used in the current environment for a period of time to count the quality of the particles filtered in the air filter.
Specifically, acquiring the mass of particles filtered by the air cleaner in the current unit time includes the following steps S111 to S113.
S111: a particulate matter concentration parameter of the air filter in currently inhaled air is obtained.
The air particulate matter concentration parameter is used to characterize the mass of particulate matter per unit volume of air. The current particulate matter concentration of the ambient air can be directly detected. But considering that the particulate matter concentration parameter of the current ambient air is continuously changing, the representative is not enough. This can lead to a large evaluation result, i.e. an overestimation of the remaining service life of the air filter, for example when the current parameter of the concentration of particulate matter of the ambient air is at a minimum value during the day, as a result of which the air filter is still in use already at the end of its service life, which can easily lead to damage to the engine. When the current ambient air particulate matter concentration parameter is at a maximum during the day, this may result in a less than estimated result in an air filter having an estimated remaining useful life that is too low, with the result that the air filter is still usable but has been suggested to be replaced, but this does not affect the normal operation of the engine, and although it may result in a portion of the usable life of the air filter being wasted, it is acceptable in comparison to causing engine damage. Therefore, the particulate matter concentration parameter cannot be directly adopted to detect the particulate matter concentration of the current ambient air.
In this embodiment, obtaining the parameter of the concentration of particulate matters in the currently inhaled air by the air filter includes the following steps:
s1111: obtaining a first particulate matter concentration C of a current environment 1 。
The first particulate matter concentration in the air in the present environment may be measured by a light scattering measurement instrument.
S1112: and acquiring the air quality index AQI of the current environment.
Local weather information can be queried through the internet to obtain a local air quality index, AQI.
S1113: air quality index determination based on current environmentSecond concentration of particulate matter C 2 。
Specifically, determining the second particulate matter concentration based on the air quality index of the current environment includes the steps of:
and obtaining a corresponding relation model of the current air quality index and the particulate matter concentration.
Inputting the air quality index AQI of the current environment into the corresponding relation model, and outputting a second particulate matter concentration C by the corresponding relation model 2 。
The model can be preset in the controller, and the corresponding relation model can be fitted through the cloud platform by acquiring multiple groups of test data and uploading the test data to the cloud platform. Wherein the test data comprises a first particulate matter concentration C at the same time node 1 And an Air Quality Index (AQI), wherein the fitted corresponding relation model is y = f (AQI). Wherein y is a dependent variable and AQI is an independent variable, the air quality index AQI of the current environment is input into the corresponding relation model, and the corresponding relation model outputs a second particulate matter concentration y, which is the second particulate matter concentration C 2 。
S1114: at a first particulate matter concentration C 1 And a second particulate matter concentration C 2 The larger of the two is taken as the particulate matter concentration parameter C.
It will be appreciated that y = f (AQI) is a function fitted through previous data, which for the current air quality index AQI is taken into the function f (AQI), and a second particulate matter concentration C is output 2 Size and C of 1 The larger value of the two is adopted as a particulate matter concentration parameter and used for evaluating the residual life of the air filter, so that the problem of overlarge residual life evaluation can be effectively avoided, and the phenomenon that the engine is damaged is avoided.
S112: the current intake air quantity of the air filter per unit time is acquired.
The total amount of air inflow passing through the inlet of the air filter within a certain time can be detected through the flow sensor, and the ratio of the total amount of air inflow to the duration of the certain time is the current air inflow in unit time.
S113: the mass of the particles filtered per unit time is determined based on the particle concentration parameter and the intake air amount per unit time.
Specifically, the formula for determining the mass of particles filtered per unit time based on the particulate matter concentration parameter and the intake air amount per unit time is:
wherein m is Δt The unit of the mass of the filtered particles in unit time is mg/s, delta t is a time period, the unit is s, C is a particle concentration parameter, and the unit is mg/m 3 ，V Δt Is the intake air amount in the time period and has the unit of m 3 。
S120: and acquiring the current front-back pressure difference of the air filter.
The front-back pressure difference of the air filter can be detected through a pressure difference sensor connected with the controller, and then the front-back pressure difference of the air filter is obtained.
S130: and acquiring the pressure difference before and after the service life of the air filter.
The differential pressure before and after the end of the service life of the air filter can be obtained through testing by a bench test and is prestored in the controller. It should be noted that the pressure differential across the end of life varies for different types of air cleaners and engines.
S140: the remaining life of the air cleaner is determined based on the difference between the pre-post differential pressure at the end of the air cleaner life and the current pre-post differential pressure, and the mass of particles filtered per unit time.
Specifically, the formula for determining the remaining life of the air cleaner based on the difference between the pre-post pressure difference at the end of the life of the air cleaner and the current pre-post pressure difference, and the mass of the filtered particles per unit time is:
wherein t is the remaining life of the air cleaner, K is a coefficient, P b Is the pressure difference, P, before and after the end of the life of the air cleaner Δt Is the current front-back pressure difference of the air filter, C is the particle concentration parameter of the current environment, m Δt Is the mass of particles filtered during the air filter period.
In the present embodiment, the first and second electrodes are,
where m is the mass of particles filtered by the air cleaner from the beginning to the end of its life, P a The differential pressure before and after the beginning of the filter life is given in Pa.
The specific value of K can be obtained by testing in a previous stage bench test. Can be pre-stored in the controller as empirical data in advance.
S150: and judging whether the residual service life of the air filter is less than a set value, if so, executing S160, and otherwise, executing S110.
S160: the alarm device gives an alarm.
The preset value can be set as required, and the preset value is exemplarily given to be equal to 24h in the embodiment. When the residual service life of the air filter is less than 24h, the controller controls the alarm device to give an alarm prompt to remind a driver to replace the air filter as soon as possible. The alarm device can be a display screen, an audible and visual alarm and the like.
According to the method for predicting the residual life of the air filter, the quality of particles filtered by the air filter in the current unit time, the current front-back pressure difference of the air filter and the front-back pressure difference of the air filter at the end of the service life of the air filter are obtained; and the residual service life of the air filter is determined based on the difference between the front-back pressure difference and the current front-back pressure difference when the service life of the air filter is over and the mass of the filtered particles in unit time, and the residual service life of the air filter can be accurately estimated.
It should be noted that in this embodiment, the sequence of the steps S110, S120, and S130 may be adjusted at will.
As shown in fig. 4, the present invention further provides an air filter remaining life prediction device for implementing the air filter remaining life prediction method. The air cleaner remaining-life predicting apparatus includes an information acquiring module 100, a current differential pressure acquiring module 200, an end-of-life differential pressure acquiring module 300, and a remaining-life determining module 400. The information acquisition module 100 is configured to acquire the mass of particles filtered by the air cleaner in a current unit time; the current pressure difference obtaining module 200 is used for obtaining the current front-back pressure difference of the air filter; the end-of-life differential pressure acquisition module 300 is configured to acquire a front-to-back differential pressure at the end of the life of the air cleaner; the remaining life determination module 400 is configured to determine a remaining life of the air filter based on a difference between a pre-post pressure difference at the end of the life of the air filter and a current pre-post pressure difference, and a mass of particles filtered per unit time.
The information acquisition module 100 includes a particulate matter concentration parameter acquisition module for acquiring a particulate matter concentration parameter of the air cleaner in the currently inhaled air, and a current unit time air intake amount acquisition unit for acquiring a current unit time air intake amount of the air cleaner; and an in-unit-time filtered particle mass confirmation unit that determines a mass of particles filtered in a unit time based on the particulate matter concentration parameter and the intake air amount in the unit time.
The particle concentration parameter acquisition module comprises a first particle concentration acquisition unit for acquiring a first particle concentration of a current environment, an air quality index acquisition unit for acquiring an air quality index of the current environment, a second particle concentration acquisition unit for determining a second particle concentration based on the air quality index of the current environment, a comparison unit for comparing the sizes of the first particle concentration and the second particle concentration, and a particle concentration parameter confirmation unit for determining a larger value of the first particle concentration and the second particle concentration as a particle concentration parameter.
The present embodiment also provides a storage medium having stored thereon a computer program that, when executed by a vehicle controller, implements the above-described air cleaner remaining life prediction method. Of course, the storage medium provided by the embodiment of the present invention contains computer-executable instructions, and the computer-executable instructions are not limited to the operations in the method for predicting remaining life of an air filter as described above, and can also perform related operations in the method for predicting remaining life of an air filter provided by the embodiment of the present invention, and have corresponding functions and advantages.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (8)
1. A method of predicting remaining life of an air cleaner, comprising:
acquiring the mass of particles filtered by the air filter in the current unit time; acquiring the current front-back pressure difference of the air filter; acquiring the front-back pressure difference of the air filter at the end of the service life;
determining the remaining life of the air filter based on the difference between the pre-post pressure difference at the end of the life of the air filter and the current pre-post pressure difference and the mass of the filtered particles in the unit time;
the formula for determining the remaining life of the air filter based on the difference between the pre-post pressure difference at the end of the life of the air filter and the current pre-post pressure difference, and the mass of the particles filtered in the unit time is as follows:
wherein t is the remaining life of the air cleaner, K is the coefficient, P b Is the pressure difference, P, before and after the end of the life of the air cleaner Δt Is the current pressure difference before and after the air filter, C is the particle concentration parameter of the current environment, m Δt Is the mass of particles filtered during the air filter period.
2. The method of predicting remaining life of an air cleaner according to claim 1, wherein obtaining a mass of particles filtered by the air cleaner per unit time includes:
acquiring a particulate matter concentration parameter of the air filter in currently sucked air;
acquiring the current air inflow per unit time of the air filter;
and determining the mass of the filtered particles in the unit time based on the particle concentration parameter and the air intake amount in the unit time.
3. The air cleaner remaining-life prediction method according to claim 2, wherein obtaining the parameter of the particulate matter concentration of the air cleaner in currently-inhaled air includes:
acquiring a first particulate matter concentration of a current environment;
acquiring an air quality index of the current environment;
determining a second particulate matter concentration based on an air quality index of the current environment;
the larger of the first particulate matter concentration and the second particulate matter concentration is taken as the particulate matter concentration parameter.
4. The air filter remaining life prediction method of claim 3, wherein determining a second particulate matter concentration based on the air quality index of the current environment comprises:
obtaining a corresponding relation model of the current air quality index and the particulate matter concentration;
and inputting the air quality index into the corresponding relation model, and outputting a second particulate matter concentration by the corresponding relation model.
5. The air cleaner remaining-life prediction method according to claim 2, wherein the formula that determines the mass of particles filtered per unit time based on the particulate matter concentration parameter and the intake air amount per unit time is:
wherein m is Δt Is the mass of the particles filtered in unit time, Δ t is the time period, C is the particle concentration parameter of the current environment, V Δt Is the amount of intake air in the period.
6. The air cleaner remaining-life prediction method according to claim 1,
m is the mass of particles filtered by the air cleaner from the beginning to the end of its life, P a Is the differential pressure before and after the beginning of the filter life.
7. The method for predicting remaining life of an air cleaner as set forth in any one of claims 1 to 6, wherein it is judged whether or not the remaining life of the air cleaner is less than a set value, and if so, an alarm device issues an alarm.
8. A storage medium on which a computer program is stored, the program realizing the air cleaner remaining life prediction method according to any one of claims 1 to 7 when executed by a vehicle controller.
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| CN114151215A (en) * | 2021-11-30 | 2022-03-08 | 东风商用车有限公司 | Air filtering mode switching method, device, equipment and storage medium |
| CN114159858B (en) * | 2021-12-27 | 2023-04-28 | 江苏富淼科技股份有限公司 | Filtering system and early warning method thereof |
| CN115006921B (en) * | 2022-06-23 | 2024-03-15 | 中国第一汽车股份有限公司 | Method, device, equipment and medium for predicting service life of air filter |
| CN115095456B (en) * | 2022-07-01 | 2023-12-12 | 一汽解放汽车有限公司 | Maintenance prompting method and device for air filter and computer equipment |
| CN115419527B (en) * | 2022-09-20 | 2023-11-10 | 徐州徐工挖掘机械有限公司 | Engineering machinery engine air inlet monitoring system and method |
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| US8626456B2 (en) * | 2010-03-23 | 2014-01-07 | GM Global Technology Operations LLC | Methods for determining a remaining useful life of an air filter |
| CN202119689U (en) * | 2011-06-02 | 2012-01-18 | 广东省环境监测中心 | Quasi constant weight weighing device for monitoring mass concentration of atmospheric particulate matter in oscillation balance method |
| US10006393B2 (en) * | 2016-01-22 | 2018-06-26 | GM Global Technology Operations LLC | Methods and systems for determining and reporting a remaining useful life of an air filter |
| CN106289828B (en) * | 2016-07-18 | 2019-01-15 | 北京艾瑞克林科技有限公司 | A kind of air purifier and its filter service life detection method |
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