CN114234364A - Air conditioner filter screen filth blockage judging method and device and air conditioner - Google Patents

Air conditioner filter screen filth blockage judging method and device and air conditioner Download PDF

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Publication number
CN114234364A
CN114234364A CN202111553823.3A CN202111553823A CN114234364A CN 114234364 A CN114234364 A CN 114234364A CN 202111553823 A CN202111553823 A CN 202111553823A CN 114234364 A CN114234364 A CN 114234364A
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China
Prior art keywords
frequency
temperature
filter screen
coil
air conditioner
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CN202111553823.3A
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CN114234364B (en
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袁封明
周涯宸
王成
张新明
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Aux Air Conditioning Co Ltd
Ningbo Aux Electric Co Ltd
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Ningbo Aux Electric Co Ltd
Ningbo Aux Intelligent Commercial Air Conditioning Manufacturing Co Ltd
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Publication of CN114234364A publication Critical patent/CN114234364A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/30—Control or safety arrangements for purposes related to the operation of the system, e.g. for safety or monitoring
    • F24F11/32—Responding to malfunctions or emergencies
    • F24F11/39—Monitoring filter performance
    • 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
    • F24F11/62—Control or safety arrangements characterised by the type of control or by internal processing, e.g. using fuzzy logic, adaptive control or estimation of values
    • F24F11/63—Electronic processing
    • F24F11/64—Electronic processing using pre-stored data
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F11/00—Control or safety arrangements
    • F24F11/70—Control systems characterised by their outputs; Constructional details thereof
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2110/00—Control inputs relating to air properties
    • F24F2110/10—Temperature
    • F24F2110/12—Temperature of the outside air
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F24—HEATING; RANGES; VENTILATING
    • F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
    • F24F2140/00—Control inputs relating to system states
    • F24F2140/20—Heat-exchange fluid temperature
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
    • Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Fuzzy Systems (AREA)
  • Mathematical Physics (AREA)
  • Air Conditioning Control Device (AREA)

Abstract

The invention discloses a filth blockage judging method and device for an air conditioner filter screen and an air conditioner, and relates to the technical field of air conditioners, wherein the filth blockage judging method for the air conditioner filter screen comprises the following steps: when the accumulated running time of the indoor fan reaches the preset time, judging whether the air conditioner is in a heating mode or not, and judging whether the cold air prevention mode is in a closed state or not; if yes, acquiring the indoor environment temperature, the coil temperature and the compressor running frequency, and determining the inner ring temperature difference of the inner pipe and the coil heating rate based on the indoor environment temperature and the coil temperature; and judging whether the filter screen is dirty or not based on the inner ring temperature difference of the inner pipe, the temperature rise rate of the coil pipe and the running frequency of the compressor. The invention comprehensively considers a plurality of operation indexes of the air conditioner so as to avoid the misjudgment of the filth blockage of the filter screen as much as possible and improve the accuracy of the filth blockage judgment of the filter screen.

Description

Air conditioner filter screen filth blockage judging method and device and air conditioner
Technical Field
The invention relates to the technical field of air conditioners, in particular to a filth blockage judging method and device for an air conditioner filter screen and an air conditioner.
Background
The filth stifled condition takes place easily for the filter screen that sets up on the air conditioner indoor unit, can lead to the amount of wind to reduce when the filter screen takes place filth stifled, and exhaust temperature and height are on the high side under the mode of heating, if be in filth stifled state for a long time can lead to the compressor coil overheated, influence the effect of heating. In the existing filter screen filth blockage judging mode, after the accumulated running time of the fan reaches a certain time, the filter screen is considered to be filth blockage to remind a user of cleaning. However, when the accumulated running time of the fan reaches a certain time, the filter screen may not be dirty and blocked, so that the accuracy of judging the dirty and blocked filter screen is low, and erroneous judgment is easily caused.
Disclosure of Invention
In order to solve the problems, the invention provides a method and a device for judging filth blockage of a filter screen of an air conditioner and the air conditioner, which can prevent the filter screen filth blockage from being judged by mistake and improve the accuracy of filth blockage judgment of the filter screen.
According to an embodiment of the present invention, on the one hand, a filth blockage judgment method for an air conditioner filter screen is provided, which includes: when the accumulated running time of the indoor fan reaches the preset time, judging whether the air conditioner is in a heating mode or not, and judging whether the cold air prevention mode is in a closed state or not; if yes, acquiring the indoor environment temperature, the coil temperature and the compressor running frequency, and determining the inner ring temperature difference of the inner pipe and the coil heating rate based on the indoor environment temperature and the coil temperature; and judging whether the filter screen is dirty or not based on the inner ring temperature difference of the inner pipe, the temperature rise rate of the coil pipe and the running frequency of the compressor.
By adopting the technical scheme, the temperature difference of the inner ring of the inner pipe and the heating rate of the coil pipe are detected and calculated, whether the filter screen is dirty and blocked or not is judged according to the temperature difference of the inner ring of the inner pipe, the heating rate of the coil pipe and the frequency of the compressor, multiple operation indexes of the air conditioner are comprehensively considered, misjudgment of the dirty and blocked filter screen can be avoided, and the accuracy of the dirty and blocked judgment of the filter screen is improved.
Preferably, the step of judging whether the filter screen is dirty or not based on the inner pipe inner ring temperature difference, the coil pipe heating rate and the compressor operation frequency comprises: acquiring the maximum value of the coil temperature within a first preset time period when a compressor is started to obtain a target coil temperature; and when the inner ring temperature difference of the inner pipe is greater than a preset difference value, the target coil temperature is greater than or equal to a preset limit value, the coil heating rate is greater than a preset rate, and the compressor running frequency is greater than a preset frequency, determining that the filter screen is dirty and blocked.
Through adopting above-mentioned technical scheme, it is very fast at current coil pipe temperature rise, and compressor operating frequency is great, confirms that the filter screen takes place filth stifled, has promoted the filth accuracy of judging of filter screen, avoids influencing the normal operating of air conditioner, has promoted user experience.
Preferably, the step of determining the temperature difference of the inner ring of the inner pipe and the temperature rise rate of the coil based on the indoor environment temperature and the coil temperature includes: acquiring indoor environment temperature and coil pipe temperature when a compressor is started for a first preset time, and calculating the difference between the coil pipe temperature and the indoor environment temperature to obtain the inner ring temperature difference of the inner pipe; acquiring the initial coil temperature when the compressor is started and the maximum coil temperature within a second preset time period when the compressor is started; acquiring acquisition time corresponding to the maximum coil temperature, and determining the coil heating rate based on the initial coil temperature, the maximum coil temperature and the acquisition time.
By adopting the technical scheme, the temperature difference of the inner ring of the inner pipe and the heating rate of the temperature of the coil pipe rising to the maximum coil pipe temperature are calculated, the rising speed of the temperature of the coil pipe can be accurately obtained, and a reliable judgment basis is provided for judging filth blockage of the filter screen.
Preferably, the first preset time period is determined based on the current indoor ambient temperature: if the current indoor environment temperature is greater than or equal to a preset temperature, the value of the first preset time is X; if the current indoor environment temperature is lower than the preset temperature, the value of the first preset time is Y; wherein Y > X.
Through adopting above-mentioned technical scheme, when current indoor ambient temperature is higher, will judge long setting for long for short, when current indoor ambient temperature is lower, will judge long setting for long, avoid the coil pipe temperature to reach steady state, lead to calculating the inner tube inner ring difference in temperature that obtains inaccurate, promoted the accuracy that the inner tube inner ring difference in temperature was confirmed, provide accurate judgement basis for the filthy stifled judgement of filter screen.
Preferably, when the maximum frequency of the air conditioner is greater than or equal to a preset frequency threshold, the preset frequency is a first frequency; the maximum frequency limiting frequency is the maximum value of the corresponding frequency limiting frequencies of the air conditioner at the outdoor ambient temperatures; when the frequency-limited maximum frequency is smaller than the preset frequency threshold, the preset frequency is a second frequency; wherein the second frequency is less than the first frequency.
Through adopting above-mentioned technical scheme, correspond according to the limit frequency highest frequency of compressor and set up the frequency and judge the threshold value, when the maximum limit frequency of compressor is higher, will predetermine the frequency and set up to the great value, when the maximum limit frequency of compressor is lower, will predetermine the frequency and set up to the less value, avoid disturbing the filthy stifled judgement of filter screen because of the limit frequency difference of air conditioner, promoted the filthy stifled accuracy and the rationality of judging of filter screen.
Preferably, the method for judging filth blockage of the filter screen of the air conditioner further comprises the following steps: when the filter screen is dirty and blocked, acquiring the current outdoor environment temperature and the frequency limiting frequency corresponding to the outdoor environment temperature; the method comprises the steps of obtaining the current running frequency of a compressor, setting the frequency increasing rate of the compressor to be a first rate when the current running frequency is less than or equal to a preset target frequency, and enabling the running frequency of the compressor to be always less than the preset target frequency; the preset target frequency is related to the frequency limiting frequency, and the preset target frequency is smaller than the frequency limiting frequency; and when the current operating frequency is greater than the preset target frequency, controlling the compressor to carry out frequency reduction at a second speed until the current operating frequency is reduced to the preset target frequency.
Through adopting above-mentioned technical scheme, take place dirty stifled back at the filter screen, the frequency raising frequency and the highest operating frequency of restriction compressor to control compressor frequency reduction operation when the current operating frequency of compressor is great, can prevent that compressor operating frequency is too high, avoid the frequent overload protection of compressor, avoid the compressor coil to move under high temperature exhaust for a long time, prolonged the life of compressor, promoted the reliability and the stability of compressor operation.
Preferably, the method for judging filth blockage of the filter screen of the air conditioner further comprises the following steps: when the filter screen is dirty and blocked, sending a filter screen dirty and blocked prompt to prompt a user to clean the filter screen; and when the filter screen is detected to be detached and remounted, controlling the accumulated running time of the indoor fan to be reset.
By adopting the technical scheme, when the filter screen is accurately judged to be dirty and blocked, the filter screen dirty and blocked reminding is sent, the situation that the filter screen is not dirty and blocked actually when the reminding is sent is avoided, and the user experience is improved.
According to an embodiment of the present invention, in another aspect, there is provided an air conditioner filter filth blockage determination apparatus, including: the first judgment module is used for judging whether the air conditioner is in a heating mode or not and judging whether the cold air prevention mode is in a closed state or not when the accumulated running time of the indoor fan reaches the preset time; the determining module is used for acquiring the indoor environment temperature, the coil pipe temperature and the compressor running frequency when the air conditioner is in a heating mode and the cold air prevention mode is in a closed state, and determining the inner ring temperature difference of the inner pipe and the coil pipe heating rate based on the indoor environment temperature and the coil pipe temperature; and the second judgment module is used for judging whether the filter screen is dirty or not based on the inner pipe inner ring temperature difference, the coil pipe heating rate and the compressor running frequency.
According to an embodiment of the present invention, in another aspect, there is provided an air conditioner including a computer readable storage medium storing a computer program and a processor, the computer program being read by the processor and when executed, implementing the method according to any one of the first aspect.
According to an embodiment of the present invention, in another aspect, a computer-readable storage medium is provided, which stores a computer program, which when read and executed by a processor, implements the method according to any one of the first aspect.
The invention has the following beneficial effects: the air conditioner is in a heating mode, and the fan normally operates, the temperature difference of the inner ring of the inner pipe and the heating rate of the coil pipe are detected and calculated, whether the filter screen is dirty and blocked is judged according to the temperature difference of the inner ring of the inner pipe, the heating rate of the coil pipe and the frequency of the compressor, multiple operation indexes of the air conditioner are comprehensively considered, misjudgment of the dirty and blocked filter screen can be avoided, and the accuracy of judging the dirty and blocked filter screen is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so as to be understood and read by those skilled in the art, and are not used to limit the conditions that the present invention can be implemented, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the effects and the achievable by the present invention, should still fall within the range that the technical contents disclosed in the present invention can cover.
Fig. 1 is a flow chart of a method for judging filth blockage of a filter screen of an air conditioner according to the present invention;
fig. 2 is a schematic structural diagram of a filth blockage determination device for an air conditioner filter screen according to the present invention.
Detailed Description
The present invention is described in terms of particular embodiments, other advantages and features of the invention will become apparent to those skilled in the art from the following disclosure, and it is to be understood that the described embodiments are merely exemplary of the invention and that it is not intended to limit the invention to the particular embodiments disclosed. 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.
At present, the existing air conditioner filter screen filth blockage treatment technology has the following defects: on one hand, after the accumulated running time of the fan reaches a certain time, if the filter screen is not dirty and blocked, the user is reminded to clean, the use experience of the user is influenced, and the filter screen dirty and blocked judgment accuracy is low; on the other hand, if the filter screen is dirty and blocked after the accumulated running time of the fan reaches a certain time, the user does not clean the filter screen after the dirty and blocked reminding is sent out, frequent overload protection of the compressor is easily caused, user experience is reduced, the compressor coil runs under high-temperature exhaust for a long time, and the service life is shortened. In order to solve the problem, the method and the device for judging filth blockage of the filter screen of the air conditioner and the air conditioner provided by the embodiment of the invention can be applied to improve the accuracy of judging filth blockage of the filter screen, so that the user experience is improved. The following describes embodiments of the present invention in detail.
The present embodiment provides a method for determining filth blockage of an air conditioner filter, which may be applied to a controller of an air conditioner, and refer to a flow chart of the method for determining filth blockage of an air conditioner filter shown in fig. 1, where the method mainly includes the following steps S102 to S106:
step S102: and when the accumulated running time of the indoor fan reaches the preset time, judging whether the air conditioner is in a heating mode or not, and judging whether the cold air prevention mode is in a closed state or not.
The accumulated running time of the indoor fan can be running time which easily causes dirty and blockage of the filter screen, the value range of the accumulated running time can be 400-600 h, and the preferred value is 500 h.
When the indoor fan runs for a certain time in an accumulated mode, the filter screen is easy to be dirty and blocked, so that the normal running of the air conditioner is affected.
Step S104: if so, acquiring the indoor environment temperature, the coil temperature and the compressor running frequency, and determining the inner ring temperature difference of the inner pipe and the coil heating rate based on the indoor environment temperature and the coil temperature.
The method comprises the steps of monitoring indoor environment temperature and coil temperature respectively based on a temperature sensor, and when the accumulated running time of an indoor fan reaches the preset time, the air conditioner runs in a heating mode and a cold air prevention mode is closed, acquiring the indoor environment temperature and the coil temperature which are periodically acquired after a compressor is started to run, and acquiring the current running frequency of the compressor.
The inner ring temperature difference of the inner pipe is the difference between the temperature of the coil pipe and the indoor environment temperature, and the heating rate of the coil pipe is the rising rate of the temperature of the coil pipe within a certain time after the compressor starts to operate.
Step S106: and judging whether the filter screen is dirty or not based on the inner ring temperature difference of the inner pipe, the temperature rise rate of the coil pipe and the running frequency of the compressor.
Considering that the filter screen takes place dirty stifled back, can lead to the coil pipe temperature to rise very fast, still lead to the compressor frequently to protect to shut down easily, influence the effect of heating, through the size of judging inner tube inner ring difference in temperature, coil pipe rate of rise of temperature and compressor operating frequency, can accurately judge whether the filter screen has taken place dirty stifled.
According to the method for judging filth blockage of the filter screen of the air conditioner, when the air conditioner is in a heating mode and the fan normally runs, the temperature difference of the inner ring of the inner pipe and the temperature rise rate of the coil pipe are detected and calculated, whether filth blockage occurs to the filter screen is judged according to the temperature difference of the inner ring of the inner pipe, the temperature rise rate of the coil pipe and the frequency of the compressor, multiple operation indexes of the air conditioner are comprehensively considered, misjudgment of filth blockage of the filter screen can be avoided, and accuracy of filth blockage judgment of the filter screen is improved.
In a possible implementation manner, this embodiment provides an implementation manner for determining the temperature difference of the inner ring of the inner pipe and the temperature rise rate of the coil based on the indoor ambient temperature and the coil temperature, which can be specifically executed with reference to the following steps (1) to (3):
step (1): the indoor environment temperature and the coil pipe temperature when the compressor is started for the first preset time are obtained, and the difference value between the coil pipe temperature and the indoor environment temperature is calculated to obtain the inner ring temperature difference of the inner pipe.
Obtaining indoor environment temperature T when a compressor is started for a first preset time TInner ring tAnd coil temperature TInner pipe tThe temperature difference of the inner ring of the inner pipe is equal to the temperature T of the coil pipeInner pipe t-TInner ring t。
In a possible embodiment, the first preset time period is determined based on the current indoor ambient temperature: if the current indoor environment temperature is greater than or equal to the preset temperature, the value of the first preset time is X; if the current indoor environment temperature is lower than the preset temperature, the value of the first preset time is Y; wherein Y is greater than X, and the value range of Y-X can be 40-50 s.
The preset temperature TA may be 20 to 24 ℃. Detecting the current indoor environment temperature, determining the first preset time length based on the current indoor environment temperature, and if the current indoor environment temperature T is detectedInner ringThe temperature of the indoor environment is higher than or equal to TA ℃, the temperature of the coil can be higher, the first preset time is set to be shorter time Xs, namely, the temperature difference of the inner ring of the inner pipe is calculated when the compressor is started to operate for shorter time; if the current indoor ambient temperature TInner ringIf the temperature is less than TA ℃, the indoor environment temperature is low, the rising speed of the temperature of the coil pipe is slow, the first preset time is set to be longer time Ys, namely, the temperature difference of the inner ring of the inner pipe is calculated after the compressor is started to operate for longer time.
Through when current indoor ambient temperature is higher, it sets up to length for short to judge long time, when current indoor ambient temperature is lower, will judge long time to set up to length for long time, avoid the coil pipe temperature to reach steady state, lead to calculating the inner tube inner ring difference in temperature that obtains inaccurate, promoted the inner tube inner ring difference in temperature accuracy of confirming, provide accurate judgement basis for the filthy stifled judgement of filter screen.
Step (2): and acquiring the initial coil temperature when the compressor is started and the maximum coil temperature within a second preset time when the compressor is started.
And acquiring the temperature of the coil detected when the compressor is started, and recording the temperature of the coil when the compressor is started as the initial temperature of the coil. And acquiring the temperature of each coil detected within a second preset time when the compressor is started, and acquiring the coil temperature with the maximum temperature value from the temperature of each coil, and recording the temperature as the maximum coil temperature.
The value range of the second preset time period can be 120-130 s, namely, the temperature rise rate of the coil pipe temperature rising to the highest value is detected when the compressor is started to run for 120-130 s.
And (3): acquiring the acquisition time corresponding to the maximum coil temperature, and determining the coil temperature-rising rate based on the initial coil temperature, the maximum coil temperature and the acquisition time.
Recording the acquisition time t corresponding to the maximum coil temperaturezdThe acquisition time is timed by taking the time when the compressor is started as a timing starting point, namely the time when the compressor is started is 0, and the temperature rise rate Tv of the coil pipe is equal to (T)max inner tube 0-t3s-TInner tube 0s)/tzdWherein, TInner tube 0sIs the initial coil temperature at compressor turn-on, Tmax inner tube 0-t3sAnd turning on the compressor for a maximum coil temperature within a second preset time period.
Considering that the temperature of the coil pipe rises fast when the filter screen is dirty and blocked, the rising speed of the temperature of the coil pipe can be accurately obtained by calculating the temperature difference of the inner ring of the inner pipe and the rising speed of the temperature of the coil pipe rising to the maximum temperature of the coil pipe, and a reliable judgment basis is provided for judging the dirty and blocked filter screen.
In a possible implementation manner, the present embodiment provides an implementation manner for determining whether the filter screen is dirty or not based on the temperature difference of the inner ring of the inner pipe, the temperature rise rate of the coil pipe, and the operating frequency of the compressor, and the following steps 1) to 2) may be specifically referred to:
step 1): and acquiring the maximum value of the coil temperature within the first preset time when the compressor is started to obtain the target coil temperature.
If the current indoor ambient temperature TInner ringThe temperature of the coil pipe is more than or equal to TA ℃, and the maximum value T of the temperature of the coil pipe in the time interval of 0s-Xs after the compressor is started is obtainedmax inner tube 0-XsAnd is recorded as the target coil temperature.
If the current indoor ambient temperature TInner ringThe maximum value T of the coil temperature in the time interval of 0s-Ys after the compressor is started is obtained at the temperature of less than TA DEG Cmax inner tube 0-YsAnd is recorded as the target coil temperature.
Step 2): and when the temperature difference of the inner ring of the inner pipe is greater than a preset difference value, the temperature of the target coil pipe is greater than or equal to a preset limit value, the temperature rise rate of the coil pipe is greater than a preset rate, and the running frequency of the compressor is greater than a preset frequency, determining that the filter screen is dirty and blocked.
When the air conditioner simultaneously meets the conditions that the inner ring temperature difference of the inner pipe is greater than a preset difference value, the target coil pipe temperature is greater than or equal to a preset limit value, the coil pipe temperature rise rate is greater than a preset rate, and the compressor operation frequency is greater than a preset frequency, the current coil pipe temperature rises faster, the compressor operation frequency is higher and possibly caused by the filth blockage of the filter screen, the filter screen is determined to be filth-blocked, so that a user is reminded of cleaning the filter screen in time, and the normal operation of the air conditioner is prevented from being influenced.
The running frequency of the compressor is acquired after the compressor runs stably, if the frequency of the compressor is too low, the change of the temperature value of the pipe is small, the dirty block judgment is interfered, and therefore the dirty block judgment is reasonable when the compressor runs stably to a certain frequency.
Wherein the preset difference can be set at 10 deg.C, 25 deg.C]A preferred value is 15 ℃. The predetermined limit is TTemperature limit frequency value of inner coil-3，TTemperature limit frequency value of inner coilThe frequency limit value of the compressor frequency corresponding to the temperature of the inner coil pipe in the heating mode of the air conditioner is obtained, if the temperature of the inner coil pipe reaches the value, the frequency of the compressor cannot be continuously increased, and each air conditioner has a unique preset limit value TTemperature limit frequency value of inner coil. The value range of the preset rate can be 0.2-0.3 ℃/HZ, and the preference is givenThe value was 0.25 ℃/HZ. The value range of the preset frequency can be 35-45 HZ.
In a possible implementation manner, the present embodiment provides an implementation manner for determining the preset frequency, which may be specifically performed with reference to the following (1) to (2):
(1) when the maximum frequency of the air conditioner is greater than or equal to the preset frequency threshold value, the preset frequency is a first frequency.
The maximum frequency limiting frequency is the maximum value of the corresponding frequency limiting frequencies of the air conditioner at the outdoor ambient temperatures. And acquiring the frequency limiting frequency corresponding to each outdoor environment temperature of the air conditioner model, and acquiring the maximum value from the plurality of frequency limiting frequencies to be recorded as the frequency limiting maximum frequency Fmax. The value range of the preset frequency threshold value can be 90-110 HZ, and the preferred value is 100 HZ.
If Fmax is larger than or equal to 100HZ, the value range of the preset frequency can be set to be 40-45 HZ.
(2) When the frequency-limited maximum frequency is smaller than a preset frequency threshold value, the preset frequency is a second frequency; wherein the second frequency is less than the first frequency.
If Fmax is less than 100HZ, the value range of the preset frequency can be set to be 35-40 HZ. The frequency judgment threshold is correspondingly set according to the maximum frequency of the compressor, when the maximum frequency of the compressor is higher, the preset frequency is set to be a larger value, and when the maximum frequency of the compressor is lower, the preset frequency is set to be a smaller value, so that the filter screen filth blockage judgment is prevented from being interfered due to different frequency limiting frequencies of the air conditioner, and the accuracy and the rationality of the filter screen filth blockage judgment are improved.
In a feasible implementation manner, the method for judging filth blockage of the air conditioner filter screen provided by the embodiment further includes the following steps a to c:
step a, when the filter screen is dirty and blocked, acquiring the current outdoor environment temperature and the frequency limiting frequency corresponding to the outdoor environment temperature.
When the filter screen is determined to be dirty and blocked, the current outdoor environment temperature is detected, and the frequency limiting frequency F corresponding to the air conditioner in the current outdoor environment is obtainedN。
And b, acquiring the current operating frequency of the compressor, and when the current operating frequency is less than or equal to a preset target frequency, setting the frequency increasing rate of the compressor to be a first rate, and enabling the operating frequency of the compressor to be always less than the preset target frequency.
The preset target frequency is related to the limited frequency, and the preset target frequency is smaller than the limited frequency, and the value range of the preset target frequency may be FN×55％～FNX 65%, preferably FN×60％。
If the current operating frequency is less than or equal to the preset target frequency, the frequency increasing rate of the compressor is set to be a first rate, the first rate can be as small as possible, such as 1-2 HZ/60s, and the preferred value is 1HZ/60s, when the compressor needs frequency increasing, the compressor is controlled to increase the frequency at the first rate, and the maximum value of the operating frequency of the compressor is less than the preset target frequency.
And c, controlling the compressor to perform frequency reduction at a second speed until the current running frequency is higher than the preset target frequency until the current running frequency is reduced to the preset target frequency.
If the current operating frequency is greater than the preset target frequency, the compressor is controlled to start the frequency reduction mode to operate, the frequency reduction rate is a second rate, and the frequency reduction rate is controlled to be a second rate until the operating frequency of the compressor is reduced to the preset target frequency FNX 60%, the value range of the second rate can be 1-3 HZ/3s, and the preferred value is 1HZ/3 s.
Through taking place dirty stifled back at the filter screen, the frequency-raising frequency and the highest operating frequency of restriction compressor to control compressor operation of falling the frequency when the current operating frequency of compressor is great, can prevent that compressor operating frequency is too high, avoid the frequent overload protection of compressor, avoid the compressor coil to move under high temperature exhaust for a long time, prolonged the life of compressor, promoted the reliability and the stability of compressor operation.
In a feasible implementation manner, the method for judging filth blockage of the air conditioner filter screen provided by this embodiment further includes the following implementation manners:
when the filter screen is dirty and blocked, sending out a filter screen dirty and blocked prompt to prompt a user to clean the filter screen; and when the filter screen is detected to be detached and remounted, the accumulated running time of the fan in the control room is cleared.
The filter screen filth blockage reminding method can comprise the steps of displaying a cleaning code prompt, a voice prompt or a light prompt and other prompt modes through a display to remind a user of cleaning the filter screen. When the filter screen is detached by a user and installed again, the accumulated running time of the indoor fan is reset, the accumulated running time of the indoor fan is counted again, and when the accumulated running time of the indoor fan reaches the preset time, the method for judging filth blockage of the filter screen of the air conditioner is entered again for filth blockage judgment. The filter screen filth blockage reminding method has the advantages that the filter screen filth blockage reminding is sent when the filter screen filth blockage is accurately judged, the fact that the filter screen filth blockage does not occur when the reminding is sent is avoided, and user experience is improved.
According to the method for judging filth blockage of the air conditioner filter screen, after the accumulated running time of the indoor fan reaches a certain time, whether the filter screen is filth-blocked or not is accurately judged according to the change speed of the temperature of the coil pipe and the running frequency of the compressor, a user is reminded to clean the filter screen when the filter screen is filth-blocked, and the running frequency of the compressor is controlled, so that the compressor coil is prevented from being overheated due to high frequency, and the compressor is protected.
Corresponding to the method for judging filth blockage of the air conditioner filter screen provided by the embodiment, the embodiment of the invention provides an example for performing filter screen filth blockage reminding and operation protection on an air conditioner by applying the method for judging filth blockage of the air conditioner filter screen, and the method can be specifically executed by referring to the following steps 1 to 4:
step 1, when the accumulated running time of the indoor fan is more than or equal to 500h, and the cold air prevention mode is closed in the heating mode, judging whether the preset filth blockage generating condition is met.
Usually, after 500 hours, a filter screen can accumulate certain dust to influence the operation of the air conditioner, firstly, the judgment condition is that whether the accumulated operation time of a fan is more than or equal to 500 hours or not is judged, the fan is not started in a cold air prevention mode, and whether the filter screen is dirty or not cannot be judged, but the invention needs to judge whether the fan is dirty or not according to the pipe temperature change value after the fan is started, so the cold air prevention mode needs to be closed.
The preset filth blockage generating conditions comprise conditions I to III, and when the conditions I to III are simultaneously met, the air conditioner is determined to meet the preset filth blockage generating conditions.
The first condition is as follows: if the indoor ambient temperature TInner ringIf the temperature of the coil pipe reaches a higher value more quickly than TA ℃, the judgment time is T1s, and whether the T1s moment of the starting of the compressor meets T or not is judged firstlyInner tube t1S-TInner ring t1S＞TPreset difference valueIf yes, judging the temperature T of the coil pipe within the time interval of 0-T1s after the compressor is startedInner pipeWhether the temperature of the coil pipe exceeds a certain limit value or not, if the temperature of the coil pipe exceeds the limit value, the temperature of the coil pipe is rapidly increased and possibly caused by filth blockage, and the judgment conditions are as follows: t ismax inner tube 0-t1s≥TTemperature limit frequency value of inner coil-3. Namely TInner tube t1S-TInner ring t1S＞TPreset difference valueAnd Tmax inner tube 0-t1s≥TTemperature limit frequency value of inner coil-3 in case both conditions are fulfilled, it is determined that condition one is fulfilled.
If the indoor ambient temperature TInner ringIf the temperature of the coil pipe is lower than TA ℃, the temperature of the coil pipe slowly reaches a higher value, the judgment time is t2s, and t2s is more than t1 s. Firstly, whether the moment when the compressor is started to T2s satisfies T or not is judgedInner tube t2S-TInner ring t2S＞TPreset difference valueIf yes, judging the temperature T of the inner coil pipe within the time interval of 0-T2s after the compressor is startedInner pipeWhether the temperature of the coil pipe exceeds a certain limit value or not, if the temperature of the coil pipe exceeds the limit value, the temperature of the coil pipe is increased quickly and possibly caused by filth blockage, and the judgment conditions are as follows: t ismax inner tube 0-t2s≥TTemperature limit frequency value of inner coil-3. Namely TInner tube t2S-TInner ring t2S＞TPreset difference valueAnd Tmax inner tube 0-t2s≥TTemperature limit frequency value of inner coil-3 in case both conditions are fulfilled, it is determined that condition one is fulfilled.
Wherein the TA value is 20-24 ℃, the difference between t2 and t1 is 40-50, and t2 is more than t 1. T isInner tube t1S、TInner tube t2SAnd the instantaneous temperature values of the coil temperature at the time t1s and t2 s. T isInner ring t1S、TInner ring t2SAnd the instantaneous temperature values representing the indoor environment temperature at the time t1s and t2 s. T ismax inner tube 0-t1s、Tmax inner tube 0-t2sRespectively representThe maximum temperature value T of the inner coil pipe temperature in the time of 0-T1s and 0-T2sTemperature limit frequency value of inner coilThe compressor frequency limit value corresponding to the temperature of the inner coil pipe in the heating mode of the air conditioner is shown, the common air conditioner has the unique value, and if the temperature of the inner coil pipe reaches the value, the frequency of the compressor cannot be increased continuously. T isPreset difference valueShows the temperature difference judgment value T of the filth blockage inner disc and the inner ring of the filter screenPreset difference valueThe value range of T is more than or equal to 10 DEG CPreset difference valueLess than or equal to 25 ℃ and the default value is 15 ℃.
In heating mode, TInner ringThe temperature of the inner tube reaches a higher value more quickly than TA ℃, so the judgment time is set to be shorter T1s, TInner ringIf TA is less than, the temperature of the inner tube reaches a higher value slowly, so the judgment time is set to be longer t 2S.
And a second condition: : detecting the maximum value T of the temperature of the coil in the time range of 0-T3smax inner tube 0-t3sCalculating the maximum value T of the temperature of the coilmax inner tube 0-t3sAnd initial temperature T of coilInner tube 0sRecording the maximum value T of tube temperaturemax inner tube 0-t3sTime corresponding to time tzd. the value of t3s is 120s-130s, namely the temperature rising rate of the temperature of the detection tube rising to the highest value in 120s-130s when the compressor is started.
Calculating the inner disk temperature rise rate Tv (Tmax)Inner tube 0-t3s-TInner tube 0s)/tzdIf the Tv is more than or equal to 0.25 ℃/HZ, the temperature of the coil pipe is increased too fast, which is caused by filth blockage of the filter screen, and the condition II is determined to be met.
And (3) carrying out a third condition: after the compressor operates stably, the outer ring temperature T of the air conditioner type is calledO(namely outdoor environment temperature, the value range is usually 15-60 ℃) corresponding frequency limiting frequency FOSee the table for the values of the outer loop temperature and the frequency limit frequency as shown in the following table:
table-outer ring temperature and frequency limiting frequency value table
Figure BDA0003417916760000121
Figure BDA0003417916760000131
As shown in the first table, when the outdoor ambient temperatures take different values, the frequency limiting frequencies of the corresponding compressors are different, the maximum value is obtained from the frequency limiting frequencies corresponding to the outdoor ambient temperatures of the air conditioner and is recorded as the maximum frequency limiting Fmax, and then the current compressor operating frequency F is detected.
If Fmax is more than or equal to 100HZ and F is more than or equal to 40-45HZ, determining that the condition III is met;
and if Fmax is less than 100HZ and F is more than or equal to 35-40HZ, determining that the condition three is met.
If the running frequency of the compressor is too low, the temperature change of the coil pipe is small, and the judgment is interfered, so that the judgment needs to be carried out when the compressor runs to a certain frequency, and the judgment is reasonable; if the highest frequency of the outer ring temperature is high, the f value (i.e. the preset frequency) is too low, and the tube temperature may interfere with the determination due to low frequency change, so that when the highest frequency of the outer ring temperature of the unit is high, the f value should be synchronously increased.
Step 2, detecting the frequency limiting frequency F corresponding to the current outer ring temperatureNIf the current operating frequency F is less than or equal to FNX 60%, and if the compressor needs to be up-converted, the up-conversion rate is controlled to be 1HZ/60s, and the maximum frequency is less than FNX 60%; if F > FNX 60%, the compressor needs to start the frequency reducing mode, the frequency reducing rate is 1HZ/3s, until the frequency of the compressor is reduced to F ═ FNX 60% to.
And 3, reporting a cleaning code by a display or reminding a user to clean the filter screen through voice prompt.
And 4, removing the filter screen by the user, and resetting the accumulated running time of the indoor fan when the filter screen cannot reach the dirty and blocked judgment entry condition after being installed again.
Corresponding to the method for judging filth blockage of the air conditioner filter screen provided by the embodiment, the embodiment of the invention provides a device for judging filth blockage of the air conditioner filter screen, which can be applied to an air conditioner, and is shown in a schematic structural diagram of the device for judging filth blockage of the air conditioner filter screen shown in fig. 2, and the device comprises the following modules:
the first judging module 21 is configured to judge whether the air conditioner is in a heating mode and the cold air prevention mode is in a closed state when the accumulated running time of the indoor fan reaches a preset time.
The determining module 22 is configured to, when the air conditioner is in the heating mode and the cold air prevention mode is in the off state, obtain an indoor environment temperature, a coil temperature, and a compressor operation frequency, and determine an inner-tube inner-ring temperature difference and a coil heating rate based on the indoor environment temperature and the coil temperature.
And the second judging module 23 is used for judging whether the filter screen is dirty or not based on the inner ring temperature difference of the inner pipe, the temperature rise rate of the coil pipe and the running frequency of the compressor.
The above-mentioned air conditioner filter screen filth stifled judgement device that this embodiment provided is through being in the mode of heating at the air conditioner, and the fan normal operating, detects and calculates inner tube inner ring difference in temperature and coil pipe rate of heating, judges whether the filter screen takes place filth stifled according to inner tube inner ring difference in temperature, coil pipe rate of heating and compressor frequency, has comprehensively considered the multinomial operation index of air conditioner, can avoid the erroneous judgement to the filth stifled filter screen, has promoted the filth stifled accuracy of judging of filter screen.
In an embodiment, the second determining module 23 is further configured to obtain a maximum coil temperature value within a first preset time period of starting the compressor, so as to obtain a target coil temperature; and when the temperature difference of the inner ring of the inner pipe is greater than a preset difference value, the temperature of the target coil pipe is greater than or equal to a preset limit value, the temperature rise rate of the coil pipe is greater than a preset rate, and the running frequency of the compressor is greater than a preset frequency, determining that the filter screen is dirty and blocked.
In an embodiment, the determining module 22 is further configured to obtain an indoor ambient temperature and a coil temperature when the compressor is turned on for a first preset time, and calculate a difference between the coil temperature and the indoor ambient temperature to obtain an inner-ring temperature difference of the inner tube; acquiring the initial coil temperature when the compressor is started and the maximum coil temperature within a second preset time period when the compressor is started; acquiring the acquisition time corresponding to the maximum coil temperature, and determining the coil temperature-rising rate based on the initial coil temperature, the maximum coil temperature and the acquisition time.
In one embodiment, the first preset time period is determined based on the current indoor ambient temperature: if the current indoor environment temperature is greater than or equal to the preset temperature, the value of the first preset time is X; if the current indoor environment temperature is lower than the preset temperature, the value of the first preset time is Y; wherein Y > X.
In one embodiment, when the frequency-limited maximum frequency of the air conditioner is greater than or equal to a preset frequency threshold, the preset frequency is a first frequency; the maximum frequency limiting frequency is the maximum value of the corresponding frequency limiting frequencies of the air conditioner at the outdoor ambient temperatures; when the frequency-limited maximum frequency is smaller than a preset frequency threshold value, the preset frequency is a second frequency; wherein the second frequency is less than the first frequency.
In one embodiment, the above apparatus further comprises:
the second control module is used for acquiring the current outdoor environment temperature and the frequency limiting frequency corresponding to the outdoor environment temperature when the filter screen is dirty and blocked; acquiring the current operating frequency of the compressor, and when the current operating frequency is less than or equal to a preset target frequency, setting the frequency increasing rate of the compressor to be a first rate, and enabling the operating frequency of the compressor to be always less than the preset target frequency; the preset target frequency is related to the frequency limiting frequency, and the preset target frequency is smaller than the frequency limiting frequency; and when the current running frequency is greater than the preset target frequency, controlling the compressor to perform frequency reduction at a second speed until the current running frequency is reduced to the preset target frequency.
The filth blockage reminding module is used for sending out a filth blockage reminding for reminding a user to clean the filter screen when the filter screen is filth blocked; and when the filter screen is detected to be detached and remounted, the accumulated running time of the fan in the control room is cleared.
The above-mentioned air conditioner filter screen is dirty stifled judgement device that this embodiment provided reaches the certain time after long when the accumulative total operation of indoor fan, and whether take place dirty stifled according to the filter screen is accurately judged to the variation speed and the compressor operating frequency of coil pipe temperature to remind the user to wash the filter screen when the filter screen takes place dirty stifled, control compressor operating frequency simultaneously, prevent that the compressor coil from because of high frequency is overheated, played the guard action to the compressor.
Corresponding to the method for judging filth blockage of the air conditioner filter screen provided by the embodiment, the embodiment provides an air conditioner, the air conditioner comprises a computer readable storage medium and a processor, wherein a computer program is stored in the computer readable storage medium, and when the computer program is read by the processor and runs, the method for judging filth blockage of the air conditioner filter screen provided by the embodiment is realized.
The present embodiment further provides a computer-readable storage medium, where a computer program is stored on the computer-readable storage medium, and when executed by a processor, the computer program implements each process of the above method for judging filth blockage of an air conditioner filter, and can achieve the same technical effect, and in order to avoid repetition, the detailed description is omitted here. The computer-readable storage medium may be a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk.
Of course, those skilled in the art will understand that all or part of the processes in the methods of the above embodiments may be implemented by instructing the control device to perform operations through a computer, and the programs may be stored in a computer-readable storage medium, and when executed, the programs may include the processes of the above method embodiments, where the storage medium may be a memory, a magnetic disk, an optical disk, and the like.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.
Finally, it should also be noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The dirty and blocked judgment device for the air conditioner filter screen and the air conditioner disclosed by the embodiment correspond to the dirty and blocked judgment method for the air conditioner filter screen disclosed by the embodiment, so that the description is relatively simple, and the relevant points can be referred to the description of the method part.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Although the present invention is disclosed above, the present invention is not limited thereto. Various changes and modifications may be effected therein by one skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.

Claims (10)

1. A filth blockage judging method for an air conditioner filter screen is characterized by comprising the following steps:
when the accumulated running time of the indoor fan reaches the preset time, judging whether the air conditioner is in a heating mode or not, and judging whether the cold air prevention mode is in a closed state or not;
if yes, acquiring the indoor environment temperature, the coil temperature and the compressor running frequency, and determining the inner ring temperature difference of the inner pipe and the coil heating rate based on the indoor environment temperature and the coil temperature;
and judging whether the filter screen is dirty or not based on the inner ring temperature difference of the inner pipe, the temperature rise rate of the coil pipe and the running frequency of the compressor.
2. The method for judging filth blockage of a filter screen of an air conditioner as claimed in claim 1, wherein the step of judging whether the filter screen is filth-blocked or not based on the temperature difference of the inner ring of the inner pipe, the temperature rise rate of the coil pipe and the operation frequency of the compressor comprises the following steps:
acquiring the maximum value of the coil temperature within a first preset time period when a compressor is started to obtain a target coil temperature;
and when the inner ring temperature difference of the inner pipe is greater than a preset difference value, the target coil temperature is greater than or equal to a preset limit value, the coil heating rate is greater than a preset rate, and the compressor running frequency is greater than a preset frequency, determining that the filter screen is dirty and blocked.
3. The method for determining filth blockage of filter screen of air conditioner according to claim 1, wherein the step of determining inner-tube inner-ring temperature difference and coil heating rate based on the indoor environment temperature and the coil temperature comprises:
acquiring indoor environment temperature and coil pipe temperature when a compressor is started for a first preset time, and calculating the difference between the coil pipe temperature and the indoor environment temperature to obtain the inner ring temperature difference of the inner pipe;
acquiring the initial coil temperature when the compressor is started and the maximum coil temperature within a second preset time period when the compressor is started;
acquiring acquisition time corresponding to the maximum coil temperature, and determining the coil heating rate based on the initial coil temperature, the maximum coil temperature and the acquisition time.
4. A filth clogging judging method for a filter screen of an air conditioner according to claim 2 or 3, characterized in that the first preset time period is determined based on the current indoor ambient temperature: if the current indoor environment temperature is greater than or equal to a preset temperature, the value of the first preset time is X; if the current indoor environment temperature is lower than the preset temperature, the value of the first preset time is Y; wherein Y > X.
5. The method for judging filth blockage of the filter screen of the air conditioner as claimed in claim 2, wherein when the frequency-limited maximum frequency of the air conditioner is greater than or equal to a preset frequency threshold, the preset frequency is a first frequency; the maximum frequency limiting frequency is the maximum value of the corresponding frequency limiting frequencies of the air conditioner at the outdoor ambient temperatures;
when the frequency-limited maximum frequency is smaller than the preset frequency threshold, the preset frequency is a second frequency; wherein the second frequency is less than the first frequency.
6. A filth blockage judging method for a filter screen of an air conditioner according to any one of claims 1 to 3, further comprising:
when the filter screen is dirty and blocked, acquiring the current outdoor environment temperature and the frequency limiting frequency corresponding to the outdoor environment temperature;
the method comprises the steps of obtaining the current running frequency of a compressor, setting the frequency increasing rate of the compressor to be a first rate when the current running frequency is less than or equal to a preset target frequency, and enabling the running frequency of the compressor to be always less than the preset target frequency; the preset target frequency is related to the frequency limiting frequency, and the preset target frequency is smaller than the frequency limiting frequency;
and when the current operating frequency is greater than the preset target frequency, controlling the compressor to carry out frequency reduction at a second speed until the current operating frequency is reduced to the preset target frequency.
7. The method for judging filth blockage of the filter screen of the air conditioner as claimed in claim 6, further comprising:
when the filter screen is dirty and blocked, sending a filter screen dirty and blocked prompt to prompt a user to clean the filter screen;
and when the filter screen is detected to be detached and remounted, controlling the accumulated running time of the indoor fan to be reset.
8. The utility model provides an air conditioner filter screen filth blocks up judgement device which characterized in that includes:
the first judgment module is used for judging whether the air conditioner is in a heating mode or not and judging whether the cold air prevention mode is in a closed state or not when the accumulated running time of the indoor fan reaches the preset time;
the determining module is used for acquiring the indoor environment temperature, the coil pipe temperature and the compressor running frequency when the air conditioner is in a heating mode and the cold air prevention mode is in a closed state, and determining the inner ring temperature difference of the inner pipe and the coil pipe heating rate based on the indoor environment temperature and the coil pipe temperature;
and the second judgment module is used for judging whether the filter screen is dirty or not based on the inner pipe inner ring temperature difference, the coil pipe heating rate and the compressor running frequency.
9. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, the computer program being read and executed by the processor to implement the method of any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that it stores a computer program which, when read and executed by a processor, implements the method according to any one of claims 1-7.
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