CN105299839B - Screen pack condition detection method and device - Google Patents
Screen pack condition detection method and device Download PDFInfo
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- CN105299839B CN105299839B CN201510761368.4A CN201510761368A CN105299839B CN 105299839 B CN105299839 B CN 105299839B CN 201510761368 A CN201510761368 A CN 201510761368A CN 105299839 B CN105299839 B CN 105299839B
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- screen pack
- predetermined threshold
- warning message
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F13/00—Details common to, or for air-conditioning, air-humidification, ventilation or use of air currents for screening
- F24F13/28—Arrangement or mounting of filters
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F11/00—Control or safety arrangements
- F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
- F24F11/32—Responding to malfunctions or emergencies
- F24F11/39—Monitoring filter performance
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Air Conditioning Control Device (AREA)
Abstract
The invention provides a kind of screen pack condition detection method and device, wherein, this method includes：Detect the current PWM duty cycle of unit；In the case of it is determined that the PWM duty cycle is less than the first predetermined threshold, generation cleaning screen pack warning message；In the case of it is determined that the PWM duty cycle is less than the second predetermined threshold, screen pack warning message is changed in generation, wherein, first predetermined threshold is more than second predetermined threshold.The present invention solves the technical problem of the cleaning that can not accurately determine screen pack in the prior art and replacing construction, has reached cleaning and the replacing construction of accurate determination screen pack, and can remind the technique effect of user in time.
Description
Technical field
The present invention relates to field of intelligent control technology, in particular to a kind of screen pack condition detection method and device.
Background technology
Air-conditioning system typically can all install sieve pack, and screen pack is to belong to consumptive material, it is necessary to regularly replace.Screen pack
Usage time it is relevant with the air quality of air-conditioning installation environment, general air quality is poorer, and dust is more, and greasy dirt is more, mistake
Filter screen needs are changed just frequent.
Current practices well is that the general usage time of screen pack is indicated in the operation instructions of air-conditioning, is led to this
Know when user needs to change screen pack.However, during actual use, can't active warning user need more
Screen pack is changed, and because the air quality of the actual installation environment of air-conditioning is different, also results in the service life length of screen pack
It is widely different, if only with think estimation mode, very inaccurately.If filter screen replacement is early, screen pack can be wasted, such as
In fruit filter screen replacement evening, filter effect can be caused to be deteriorated.
Cleaning and replacing construction for how accurately to determine screen pack, not yet propose effective solution at present.
The content of the invention
The embodiments of the invention provide a kind of screen pack condition detection method, to solve accurately determine in the prior art
The cleaning of screen pack and the technical problem of replacing construction, this method include：
Detect the current PWM duty cycle of unit；
In the case of it is determined that the PWM duty cycle is less than the first predetermined threshold, generation cleaning screen pack warning message；
In the case of it is determined that the PWM duty cycle is less than the second predetermined threshold, screen pack warning message is changed in generation, its
In, first predetermined threshold is more than second predetermined threshold.
In one embodiment, different wind shelves correspond to the first different predetermined thresholds and the different second predetermined threshold
Value；
Correspondingly,
It is determined that the PWM duty cycle whether be less than first predetermined threshold before, methods described also includes：
The wind shelves that unit is currently located are determined,
Obtain the first predetermined threshold and the second predetermined threshold corresponding to the wind shelves determined.
In one embodiment, the current PWM duty cycle of unit is detected, including：
Determine whether unit is currently in the state of stable operation；
In the case where unit is in the state of stable operation, the PWM duty cycle of unit is detected.
In one embodiment, the current PWM duty cycle of unit is detected, including：
Detect whether to have generated cleaning screen pack warning message, and/or, change screen pack warning message；
If not generating cleaning screen pack warning message and changing screen pack warning message, the current PWM of detection unit
Dutycycle.
In one embodiment, detecting whether to have generated cleaning screen pack warning message, and/or, change screen pack
After warning message, methods described also includes：
If cleaning screen pack warning message has been generated, and/or, screen pack warning message is changed, then it is current to detect unit
PWM duty cycle, and determine whether the PWM duty cycle that detects is more than the 3rd predetermined threshold, wherein, the 3rd predetermined threshold
More than first predetermined threshold；
If it is greater, then the cleaning screen pack warning message generated is removed, and/or, change screen pack warning message.
The embodiment of the present invention additionally provides a kind of screen pack condition checkout gear, in the prior art can not be accurately true with solution
Determine the cleaning of screen pack and the technical problem of replacing construction, the device includes：
Detection module, the PWM duty cycle current for detecting unit；
First generation module, in the case of it is determined that the PWM duty cycle is less than the first predetermined threshold, generation to be cleaned
Screen pack warning message；
Second generation module, in the case of it is determined that the PWM duty cycle is less than the second predetermined threshold, generation to be changed
Screen pack warning message, wherein, first predetermined threshold is more than second predetermined threshold.
In one embodiment, said apparatus also includes：
Wind shelves determining module, for it is determined that the PWM duty cycle whether be less than first predetermined threshold before, it is determined that
The wind shelves that unit is currently located, and the first predetermined threshold corresponding to the wind shelves of determination and the second predetermined threshold are obtained, wherein, no
Same wind shelves correspond to the first different predetermined thresholds and the second different predetermined thresholds.
In one embodiment, the detection module includes：
Running status determining unit, for determining whether unit is currently in the state of stable operation；
First PWM duty cycle detection unit, in the case of it is determined that unit is in the state of stable operation, detection machine
The PWM duty cycle of group.
In one embodiment, the detection module includes：
Warning message detection unit, for detecting whether cleaning screen pack warning message has been generated, and/or, change filtering
Net warning message；
Second PWM duty cycle detection unit, for it is determined that not generating cleaning screen pack warning message and changing screen pack
In the case of warning message, the current PWM duty cycle of detection unit.
In one embodiment, the detection module also includes：
Clearing cell, for cleaning screen pack warning message it is determined that having generated, and/or, change screen pack warning message
In the case of, the current PWM duty cycle of detection unit, and whether the PWM duty cycle for determining to detect is more than the 3rd predetermined threshold,
In the case of it is determined that the PWM duty cycle of detection is more than the 3rd predetermined threshold, the cleaning screen pack warning generated is removed
Information, and/or, screen pack warning message is changed, wherein, the 3rd predetermined threshold is more than first predetermined threshold.
In the above-described embodiments, PWM duty cycle threshold value is preset, by the PWM duty cycle that detects with presetting
PWM duty cycle threshold value be compared, if less than PWM duty cycle threshold value set in advance, then can illustrate screen pack needs
Cleaning needs to change, and just automatically generates cleaning screen pack warning message this when or changes screen pack warning message
To notify user.When can effectively solve the cleaning and replacing that can not accurately determine screen pack in the prior art through the above way
Between technical problem, reached cleaning and the replacing construction of accurate determination screen pack, and the technology of user can have been reminded to imitate in time
Fruit.
Brief description of the drawings
The accompanying drawing for forming the part of the application is used for providing a further understanding of the present invention, schematic reality of the invention
Apply example and its illustrate to be used to explain the present invention, do not form inappropriate limitation of the present invention.In the accompanying drawings：
Fig. 1 is the method flow diagram of screen pack condition detection method according to embodiments of the present invention；
Fig. 2 is debugging process flow chart in screen pack condition detection method according to embodiments of the present invention；
Fig. 3 is detection process flow chart in screen pack condition detection method according to embodiments of the present invention；
Fig. 4 is that dutycycle warning message removes flow chart in screen pack condition detection method according to embodiments of the present invention；
Fig. 5 is the structured flowchart of screen pack condition checkout gear according to embodiments of the present invention.
Embodiment
It is right with reference to embodiment and accompanying drawing for the object, technical solutions and advantages of the present invention are more clearly understood
The present invention is described in further details.Here, the exemplary embodiment of the present invention and its illustrate to be used to explain the present invention, but simultaneously
It is not as a limitation of the invention.
Inventor considers can be by present Intelligent Measurement all technologies come the either air of the operational factor to air-conditioning
Quality is detected, and then determines the need for cleaning or changing screen pack by detecting obtained result, and remind user
Carry out the cleaning or replacement operation of screen pack.
However, if inventor is calculated it is further contemplated that adding air quality parameters, then algorithm will be answered excessively
It is miscellaneous, and the detection to air quality by from largely increase air-conditioning make detection cost.Inventor expects applying
In the air-conditioning system of direct current generator, when motor perseverance rotating speed exports, air quantity is inversely proportional with static pressure, however, when filter screen dirtying is stifled tight
During weight, the static pressure increase of air-conditioning system, air quantity will reduce, and then PWM (pulse width modulation) dutycycle of meeting motor subtracts
It is small.Therefore, it can determine whether screen pack needs to clean or change by the PWM duty cycle of air conditioner motor.Wherein, PWM is accounted for
Sky is than referring in a pulse period high level in the ratio shared by whole cycle, for example, 1 second high level, 1 second low level, that
Corresponding PWM duty cycle is exactly 50%.
As shown in figure 1, proposing a kind of screen pack condition detection method in this example, comprise the following steps：
Step 101：Detect the current PWM duty cycle of unit；
Step 102：In the case of it is determined that the PWM duty cycle is less than the first predetermined threshold, generation cleaning screen pack police
Accuse information；
Step 103：In the case of it is determined that the PWM duty cycle is less than the second predetermined threshold, screen pack police is changed in generation
Information is accused, wherein, first predetermined threshold is more than second predetermined threshold.
In the above-described embodiments, PWM duty cycle threshold value is preset, by the PWM duty cycle that detects with presetting
PWM duty cycle threshold value be compared, if less than PWM duty cycle threshold value set in advance, then can illustrate screen pack needs
Cleaning needs to change, and just automatically generates cleaning screen pack warning message this when or changes screen pack warning message
To notify user.When can effectively solve the cleaning and replacing that can not accurately determine screen pack in the prior art through the above way
Between technical problem, reached cleaning and the replacing construction of accurate determination screen pack, and the technology of user can have been reminded to imitate in time
Fruit.
Wind shelves are different caused by the unit of air-conditioning, when wind shelves difference, accounting for when corresponding normal operation
Sky is than being also different.Therefore, match in order that obtaining with each wind shelves, it is pre- that different first can be set for different wind shelves
Determine threshold value and the second different predetermined thresholds.Correspondingly, it is determined that whether the PWM duty cycle is less than first predetermined threshold
Before, it is also necessary to determine the wind shelves that unit is currently located, while obtain the first predetermined threshold corresponding to the wind shelves of determination and
Two predetermined thresholds.
Specifically, the predetermined threshold of each wind shelves can be determined according to the dutycycle after project installation result, measured,
For example, can be after project installation terminates, manual operator enters the debugging stage, and control unit runs to high wind from low wind shelves automatically
Shelves.And remember PWM duty cycle during each wind shelves stable operation, and with predetermined threshold corresponding to each wind shelves of this determination.
Because unit is either switched to after another wind shelves from unlatching to be needed just enter stable transport after running a period of time
Row state, therefore, in the current PWM duty cycle of detection unit every time, it can also first determine unit currently whether in stable
The state of operation, in the case of the state that stable operation is only in unit, just detect the PWM duty cycle of unit.
It is a lasting process in view of carrying out detection to the PWM duty cycle of unit, generation or display cleaning screen pack
Warning message, and/or, after changing screen pack warning message, user will carry out the cleaning or replacing of screen pack, change
PWM duty cycle enters regime values afterwards.Therefore, in the current PWM duty cycle of detection unit every time, can first judge whether
Cleaning screen pack warning message has been generated, and/or, change screen pack warning message, if it is determined that currently also without generation cleaning
Screen pack warning message and replacing screen pack warning message, then detect the current PWM duty cycle of unit, to determine whether that generation is clear
Filter screen warning message is washed, and/or, change screen pack warning message.
Further, cleaning screen pack warning message has been generated if detected, and/or, screen pack warning message is changed,
So determine that whether current PWM duty cycle is more than the 3rd predetermined threshold, if it does, just removing the cleaning filtering generated
Net warning message, and/or, change screen pack warning message.I.e., if it is determined that it is predetermined more than the 3rd to go out current PWM duty cycle
Threshold value, then turn out screen pack and be cleaned or changed, wherein, the 3rd predetermined threshold is more than the described first predetermined threshold
Value.
A specific embodiment is additionally provided in the embodiment of the present invention to say above-mentioned screen pack condition detection method
It is bright, it is important to note, however, that the specific embodiment merely to the present invention is better described, is not formed to the present invention not
Work as restriction.
The screen pack condition detection method can specifically be divided into the following steps：
Step 1：As shown in Fig. 2 after project installation terminates, manual operator enters the debugging stage, and control unit is automatically from low wind
Shelves run to high wind shelves, and PWM duty cycle when remembering each wind shelves stable operation：PWM01、PWM02……PWM0i.
Step 2：As shown in figure 3, PWM duty cycle PWMi corresponding to wind shelves now is detected after start constant wind shelves every time,
If PWMi<PWM0i × P1, screen pack warning message is cleaned in just generation, if PWMi<Filtering is changed in PWM0i × P2, just generation
Net warning message.
Step 3：As shown in figure 4, work as PWMi>During PWM0i × P3, remove cleaning screen pack warning message or change screen pack
Warning message, wherein, 0<P2<P1<P3<1.
In upper example, the dirty stifled state of the air-conditioning filter net using direct current generator is determined by PWM duty cycle, because being logical
PWM duty cycle determination is crossed, therefore the hardware circuit of the original circuit of air-conditioning need not be changed, it is only necessary to changes software control with right
Than the PWM duty cycle under same shelves wind speed and increase project installation and commissioning step.Can solve to detect through the above way
The problem of dirty stifled algorithm complexity of filter screen and excessive parameter, and do not increase hardware cost.
Based on same inventive concept, a kind of screen pack condition checkout gear is additionally provided in the embodiment of the present invention, it is such as following
Embodiment described in.It is similar to screen pack condition detection method to solve the principle of problem due to screen pack condition checkout gear, because
The implementation of this screen pack condition checkout gear may refer to the implementation of screen pack condition detection method, repeats part and repeats no more.
Used below, term " unit " or " module " can realize the combination of the software and/or hardware of predetermined function.Although with
Device described by lower embodiment is preferably realized with software, but hardware, or the realization of the combination of software and hardware
May and it be contemplated.Fig. 5 is a kind of structured flowchart of the screen pack condition checkout gear of the embodiment of the present invention, such as Fig. 5 institutes
Showing to include：Detection module 501, the first generation module 502 and the second generation module 503, are illustrated to the structure below.
Detection module 501, the PWM duty cycle current for detecting unit；
First generation module 502, in the case of it is determined that the PWM duty cycle is less than the first predetermined threshold, generating
Clean screen pack warning message；
Second generation module 503, in the case of it is determined that the PWM duty cycle is less than the second predetermined threshold, generating
Screen pack warning message is changed, wherein, first predetermined threshold is more than second predetermined threshold.
In one embodiment, said apparatus can also include：Wind shelves determining module, for it is determined that the PWM is accounted for
Sky is than whether less than before first predetermined threshold, determining the wind shelves that unit is currently located, and the wind shelves institute for obtaining determination is right
The first predetermined threshold and the second predetermined threshold answered, wherein, different wind shelves correspond to the first different predetermined threshold and different
Second predetermined threshold.
In one embodiment, detection module 501 can include：Running status determining unit, for determining that unit is worked as
The preceding state for whether being in stable operation；First PWM duty cycle detection unit, for it is determined that unit is in the shape of stable operation
In the case of state, the PWM duty cycle of unit is detected.
In one embodiment, detection module 501 can include：Warning message detection unit, for detecting whether
Generation cleaning screen pack warning message, and/or, change screen pack warning message；Second PWM duty cycle detection unit, for
It is determined that in the case of not generating cleaning screen pack warning message and changing screen pack warning message, the current PWM of detection unit is accounted for
Empty ratio.
In one embodiment, detection module 501 can also include：Clearing cell, for it is determined that having generated cleaning
Screen pack warning message, and/or, in the case of changing screen pack warning message, the current PWM duty cycle of detection unit, and really
Whether the PWM duty cycle that regular inspection measures is more than the 3rd predetermined threshold, it is determined that the PWM duty cycle of detection is predetermined more than the described 3rd
In the case of threshold value, the cleaning screen pack warning message generated is removed, and/or, screen pack warning message is changed, wherein, institute
State the 3rd predetermined threshold and be more than first predetermined threshold.
In another embodiment, a kind of software is additionally provided, the software is used to perform above-described embodiment and preferred reality
Apply the technical scheme described in mode.
In another embodiment, a kind of storage medium is additionally provided, above-mentioned software is stored with the storage medium, should
Storage medium includes but is not limited to：CD, floppy disk, hard disk, scratch pad memory etc..
As can be seen from the above description, the embodiment of the present invention realizes following technique effect：PWM is preset to account for
It is empty than threshold value, by the PWM duty cycle that detects compared with PWM duty cycle threshold value set in advance, if less than advance
The PWM duty cycle threshold value of setting, then it can illustrate that the cleaning of screen pack needs or needs are changed, this when just automatically generates
Cleaning screen pack warning message changes screen pack warning message to notify user.Can effectively solve through the above way existing
There is the technical problem of the cleaning that screen pack can not be accurately determined in technology and replacing construction, reached the clear of accurate determination screen pack
Wash and replacing construction, and the technique effect of user can be reminded in time.
Obviously, those skilled in the art should be understood that each module of the above-mentioned embodiment of the present invention or each step can be with
Realized with general computing device, they can be concentrated on single computing device, or are distributed in multiple computing devices
On the network formed, alternatively, they can be realized with the program code that computing device can perform, it is thus possible to by it
Store and performed in the storage device by computing device, and in some cases, can be to be held different from order herein
They, are either fabricated to each integrated circuit modules or will be multiple in them by the shown or described step of row respectively
Module or step are fabricated to single integrated circuit module to realize.So, the embodiment of the present invention is not restricted to any specific hard
Part and software combine.
The preferred embodiments of the present invention are the foregoing is only, are not intended to limit the invention, for the skill of this area
For art personnel, the embodiment of the present invention can have various modifications and variations.Within the spirit and principles of the invention, made
Any modification, equivalent substitution and improvements etc., should be included in the scope of the protection.
Claims (6)
- A kind of 1. screen pack condition detection method, it is characterised in that including：Detect the current pulse width modulation (PWM) dutycycle of unit；In the case of it is determined that the PWM duty cycle is less than the first predetermined threshold, generation cleaning screen pack warning message；In the case of it is determined that the PWM duty cycle is less than the second predetermined threshold, screen pack warning message is changed in generation, wherein, First predetermined threshold is more than second predetermined threshold；Wherein, the current PWM duty cycle of unit is detected, including：Detect whether to have generated cleaning screen pack warning message, and/or, change screen pack warning message；If not generating cleaning screen pack warning message and changing screen pack warning message, the current PWM duties of detection unit Than；Detecting whether to have generated cleaning screen pack warning message, and/or, after changing screen pack warning message, methods described Also include：If cleaning screen pack warning message has been generated, and/or, screen pack warning message is changed, then detects the current PWM of unit Dutycycle, and whether the PWM duty cycle for determining to detect is more than the 3rd predetermined threshold, wherein, the 3rd predetermined threshold is more than First predetermined threshold；If it is greater, then the cleaning screen pack warning message generated is removed, and/or, change screen pack warning message.
- 2. according to the method for claim 1, it is characterised in that different wind shelves correspond to the first different predetermined threshold and not The second same predetermined threshold；Correspondingly,It is determined that the PWM duty cycle whether be less than first predetermined threshold before, methods described also includes：The wind shelves that unit is currently located are determined,Obtain the first predetermined threshold and the second predetermined threshold corresponding to the wind shelves determined.
- 3. according to the method for claim 1, it is characterised in that the current PWM duty cycle of detection unit, including：Determine whether unit is currently in the state of stable operation；In the case where unit is in the state of stable operation, the PWM duty cycle of unit is detected.
- A kind of 4. screen pack condition checkout gear, it is characterised in that including：Detection module, the PWM duty cycle current for detecting unit；First generation module, in the case of it is determined that the PWM duty cycle is less than the first predetermined threshold, generation cleaning to be filtered Net warning message；Second generation module, in the case of it is determined that the PWM duty cycle is less than the second predetermined threshold, filtering to be changed in generation Net warning message, wherein, first predetermined threshold is more than second predetermined threshold；Wherein, the detection module includes：Warning message detection unit, for detecting whether cleaning screen pack warning message has been generated, and/or, change screen pack police Accuse information；Second PWM duty cycle detection unit, for it is determined that not generating cleaning screen pack warning message and changing screen pack warning In the case of information, the current PWM duty cycle of detection unit；Clearing cell, for cleaning screen pack warning message it is determined that having generated, and/or, the feelings of replacing screen pack warning message Under condition, the current PWM duty cycle of detection unit, and whether the PWM duty cycle for determining to detect is more than the 3rd predetermined threshold, true In the case that the PWM duty cycle that regular inspection is surveyed is more than the 3rd predetermined threshold, the cleaning screen pack warning message generated is removed, And/or screen pack warning message is changed, wherein, the 3rd predetermined threshold is more than first predetermined threshold.
- 5. device according to claim 4, it is characterised in that also include：Wind shelves determining module, for it is determined that whether the PWM duty cycle determines unit less than before first predetermined threshold The wind shelves being currently located, and the first predetermined threshold corresponding to the wind shelves of determination and the second predetermined threshold are obtained, wherein, it is different Wind shelves correspond to the first different predetermined thresholds and the second different predetermined thresholds.
- 6. device according to claim 4, it is characterised in that the detection module includes：Running status determining unit, for determining whether unit is currently in the state of stable operation；First PWM duty cycle detection unit, in the case of it is determined that unit is in the state of stable operation, detecting unit PWM duty cycle.
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| CN201510761368.4A CN105299839B (en) | 2015-11-09 | 2015-11-09 | Screen pack condition detection method and device |
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| CN201510761368.4A CN105299839B (en) | 2015-11-09 | 2015-11-09 | Screen pack condition detection method and device |
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| CN105841295A (en) * | 2016-03-28 | 2016-08-10 | 海信（山东）空调有限公司 | Filter screen service life detecting method and device |
| CN105843060A (en) * | 2016-04-07 | 2016-08-10 | 美的集团股份有限公司 | Household electrical appliance consumable purchase prompting method and equipment, intelligent terminal and automobile |
| CN106370571B (en) * | 2016-08-31 | 2019-05-31 | 青岛海尔空调器有限总公司 | Dust concentration detecting method, dust sensor and filter screen cleaning reminder method |
| CN108079701B (en) * | 2016-11-21 | 2020-11-06 | 苏州三星电子有限公司 | Method and system for detecting dust deposition degree of filter screen |
| CN107192099A (en) * | 2017-06-14 | 2017-09-22 | 广东美的暖通设备有限公司 | Air-conditioning and its laying dust determination methods and laying dust judgment means and laying dust judge system |
| CN107228461A (en) * | 2017-06-29 | 2017-10-03 | 广东美的环境电器制造有限公司 | The detection method of filter screen, system and clarifier in clarifier |
| CN107514740A (en) * | 2017-07-24 | 2017-12-26 | 珠海格力电器股份有限公司 | The filter life determination methods and filtering type unit of filtering type unit |
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| CN111272628B (en) * | 2020-02-17 | 2023-02-24 | 海信空调有限公司 | Air purification equipment and filter screen service life detection method and detection device thereof |
| CN111397091B (en) * | 2020-03-16 | 2021-11-09 | 珠海格力电器股份有限公司 | Filter screen filth blockage determining method and device, storage medium and air conditioner |
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| CN105299839A (en) | 2016-02-03 |
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