CN116045452A - Method and system for detecting filth blockage of filter screen of air conditioner - Google Patents
Method and system for detecting filth blockage of filter screen of air conditioner Download PDFInfo
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- CN116045452A CN116045452A CN202310020101.4A CN202310020101A CN116045452A CN 116045452 A CN116045452 A CN 116045452A CN 202310020101 A CN202310020101 A CN 202310020101A CN 116045452 A CN116045452 A CN 116045452A
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- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000000903 blocking effect Effects 0.000 claims abstract description 169
- 230000008859 change Effects 0.000 claims abstract description 124
- 230000009278 visceral effect Effects 0.000 claims abstract description 102
- 238000001514 detection method Methods 0.000 claims abstract description 62
- 210000001835 viscera Anatomy 0.000 claims abstract description 26
- 238000010438 heat treatment Methods 0.000 claims description 22
- 238000009529 body temperature measurement Methods 0.000 claims description 19
- 238000004140 cleaning Methods 0.000 claims description 18
- 230000008439 repair process Effects 0.000 claims description 10
- 230000000694 effects Effects 0.000 description 10
- 238000009434 installation Methods 0.000 description 3
- 238000012216 screening Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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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
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/52—Indication arrangements, e.g. displays
- F24F11/526—Indication arrangements, e.g. displays giving audible indications
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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
- F24F11/50—Control or safety arrangements characterised by user interfaces or communication
- F24F11/61—Control or safety arrangements characterised by user interfaces or communication using timers
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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
- F24F11/62—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
- F24F11/65—Electronic processing for selecting an operating mode
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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
- F24F11/70—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
- F24F11/00—Control or safety arrangements
- F24F11/89—Arrangement or mounting of control or safety devices
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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
Abstract
The embodiment of the invention provides a method and a system for detecting dirt blocking of a filter screen of an air conditioner. The method for detecting the filth blockage of the air conditioner filter screen comprises the following steps: controlling the air conditioner to operate for a first time period in a filter screen filth blockage detection state; acquiring a first temperature change value of the indoor coil temperature in the first time period and a second temperature change value of each temperature measuring point in the first time period; calculating the visceral blockage temperature difference value of each temperature measuring point according to the first temperature change value and the second temperature change value; if the viscera blockage temperature difference value is larger than the viscera blockage temperature difference reference value, judging that the temperature measuring point corresponding to the viscera blockage temperature difference value is a viscera blockage point; determining the visceral blockage percentage of the visceral blockage area according to the visceral blockage temperature difference value corresponding to each visceral blockage point and the number of the visceral blockage points; judging the filth blocking degree of the filter screen of the air conditioner according to the filth blocking percentage of the filth blocking area. The invention solves the technical problem that the filth blockage detection result of the prior filth blockage detection method of the air conditioner filter screen is inaccurate.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a method and a system for detecting dirt blocking of a filter screen of an air conditioner.
Background
With the increase of the service time of the air conditioner, the filter screen of the air conditioner inevitably generates filth blockage due to dust accumulation or sundry coverage, and when the filter screen of the air conditioner generates serious filth blockage, the air conditioner is possibly poor in heat exchange efficiency and unsmooth in ventilation, so that the air quantity of the air conditioner is obviously reduced, the heat exchange performance of the air conditioner is further reduced, and the use comfort of a user is affected. Meanwhile, the heat exchange performance of the air conditioner is reduced, electric energy is wasted, and the service lives of the fan and the compressor are shortened.
At present, a method for detecting the filth blockage of an air conditioner filter screen often judges whether the filter screen is filth blockage according to fan current, indoor environment temperature and the like, but the fan current and the indoor environment temperature are easily affected by the running state of a compressor, so that the filth blockage detection result is inaccurate. In addition, the object of the filth blocking detection of the existing air conditioner filter screen is usually a whole filter screen, and the phenomenon that local filth blocking of the filter screen is serious but filth blocking does not occur as a detection result is easy to occur.
Disclosure of Invention
The invention provides a method for detecting filth blockage of an air conditioner filter screen, which aims to solve the problem that the filth blockage detection result of the traditional air conditioner filter screen filth blockage detection method is inaccurate. The air conditioner filter screen is arranged on an air inlet grid of the air conditioner, and a plurality of temperature measuring points are distributed at the air inlet grid of the air conditioner; the method for detecting the filth blockage of the air conditioner filter screen comprises the following steps: controlling the air conditioner to operate for a first time period in a filter screen filth blockage detection state; acquiring a first temperature change value of the indoor coil temperature in the first time period and a second temperature change value of each temperature measuring point in the first time period; calculating the visceral blockage temperature difference value of each temperature measuring point according to the first temperature change value and the second temperature change value; if the viscera blockage temperature difference value is larger than the viscera blockage temperature difference reference value, judging that the temperature measuring point corresponding to the viscera blockage temperature difference value is a viscera blockage point; determining the visceral blockage percentage of the visceral blockage area according to the visceral blockage temperature difference value corresponding to each visceral blockage point and the number of the visceral blockage points; judging the filth blocking degree of the filter screen of the air conditioner according to the filth blocking percentage of the filth blocking area; wherein, ti1= (Δtp- Δtci1)/Δtci1; ti1 is the visceral temperature difference value of the ith temperature measuring point; Δtp is the first temperature change value; Δtci1 is the second temperature change value of the ith temperature measurement point; when the air conditioner runs in a filter screen filth blockage detection state, the compressor is in a closed state, and the electric auxiliary heating device and the cross-flow fan blade are in an open state.
The technical effect achieved after the technical scheme is adopted is as follows: when the air conditioner runs in the filter screen filth blockage detection state, the compressor is in the closed state, so that the temperature of the indoor coil and the temperature value at the temperature measuring point are not influenced by the running state of the compressor. At the moment, the electric auxiliary heating device and the through-flow fan blades are in an opening state, when the filter screen of the air conditioner is not blocked, a part of heat generated by the electric auxiliary heating device is blown into a room through the through-flow fan blades, so that the temperature of a temperature measuring point is increased, and a part of heat is transferred to the indoor coil pipe, so that the temperature of the indoor coil pipe is increased. Along with the gradual dirty blocking of the filter screen, the air outlet quantity at the air inlet of the air conditioner is gradually reduced, and the heat generated by electric auxiliary heat cannot be emitted, so that the first temperature change value of the indoor coil pipe temperature in the first time period is higher than the second temperature change value at the temperature measuring point. Operating the air conditioner in a filter screen filth blockage detection state for a first time period by controlling the air conditioner; acquiring a first temperature change value of the temperature of the indoor coil in a first time period and a second temperature change value of each temperature measuring point in the first time period; the method comprises the steps of calculating the dirty block temperature difference value Ti1= (delta Tp-delta Tci 1)/delta Tci1 of each temperature measurement point according to a first temperature change value and a second temperature change value, screening dirty block points from a plurality of temperature measurement points according to the size relation between the dirty block temperature difference value and the dirty block temperature difference reference value, determining the dirty block percentage of dirty block areas according to the dirty block temperature difference value of each dirty block point and the number of the dirty block points, determining the dirty block degree of the air conditioner filter screen according to the dirty block percentage of the dirty block areas, and avoiding inaccurate dirty block detection results of the filter screen caused by the influence of the installation position of the temperature detection device when only one temperature detection device is arranged at the air inlet of the air conditioner to detect the position of the air inlet.
In this technical scheme, the dirty stifled detection method of air conditioner filter screen still includes: under the condition that the air conditioner is electrified for the first time, controlling the air conditioner to run for the first time in the filth blockage detection state of the filter screen so as to acquire and store the filth blockage temperature difference reference value; acquiring a first temperature change value of the temperature of the indoor coil pipe within the first duration, and recording the first temperature change value as a first temperature change reference value; acquiring a second temperature change value of each temperature measuring point in the first time period, marking the second temperature change value as a second temperature change reference value, calculating an average value of the second temperature change reference values, and marking the average value as a second area temperature change reference value; calculating the visceral temperature difference reference value according to the first temperature change reference value and the second temperature change reference value; wherein t0= (Δtp0- Δtc)/Δtc; Δtc=1/n Σ n 1 ΔTci0，i∈[1，n]The method comprises the steps of carrying out a first treatment on the surface of the T0 is a visceral blockage temperature difference reference value; Δtp0 is a first temperature change reference value; ΔTc is a second zone temperature change reference value; Δtci0 is the second temperature change reference value of the i-th temperature measurement point; n is the number of temperature measuring points.
The technical effect achieved after the technical scheme is adopted is as follows: under the condition that the air conditioner is electrified for the first time, the filter screen of the air conditioner is in a state of no filth blockage, and the first temperature change reference value and the second area temperature change reference value when the filter screen of the air conditioner is in the state of no filth blockage can be obtained by controlling the air conditioner to operate for a first time in a state of filth blockage detection of the filter screen at the moment, and then the filth blockage temperature difference reference value can be calculated according to the first temperature change reference value and the second area temperature change reference value. By taking the average value of the second temperature change reference values of the temperature measuring points as the second area temperature change reference value, the calculation accuracy of the second area temperature change reference value can be improved, and the problem that the calculated visceral temperature difference reference value is inaccurate due to the fact that the second temperature change reference value of a single temperature measuring point is taken as the second area temperature change reference value is avoided.
In this technical scheme, the determining the blocking percentage of the blocking area according to the blocking temperature difference value corresponding to each blocking point and the number of blocking points includes: determining the dirty blocking percentage of each dirty blocking point according to the dirty blocking temperature difference value corresponding to each dirty blocking point and the dirty blocking temperature difference reference value; and determining the visceral blockage percentage of the visceral blockage area according to the visceral blockage percentage of each visceral blockage point and the number of the visceral blockage points.
The technical effect achieved after the technical scheme is adopted is as follows: the viscera blocking percentage of each viscera blocking point, namely the viscera blocking degree of each viscera blocking point, can be accurately obtained according to the viscera blocking temperature difference value corresponding to each viscera blocking point and the viscera blocking temperature difference reference value; and further, the visceral blocking percentage of the visceral blocking area, namely the whole visceral blocking degree of the visceral blocking area, can be determined according to the visceral blocking degree of each visceral blocking point and the number of the visceral blocking points. By comprehensively considering the degree of the blockage and the number of the blockage points, the blockage degree of the blockage region can be calculated more accurately.
In this technical scheme, the determining the blocking percentage of the blocking area according to the blocking percentage of each blocking point and the number of blocking points includes: pj=100% (Ti 1-T0)/T0; p=1/m Σ m 1 aj，j∈[1，m]The method comprises the steps of carrying out a first treatment on the surface of the Wherein, pj is the difference value of the visceral blockage temperature corresponding to the jth visceral blockage point; m is the number of visceral plugging points; p is the percentage of visceral occlusion in the visceral occlusion area.
The technical effect achieved after the technical scheme is adopted is as follows: it can be understood that the greater the difference between the difference value of the temperature measurement point and the reference value of the temperature difference of the visceral blockage, the greater the percentage of visceral blockage corresponding to the visceral blockage point, and the greater the visceral blockage degree corresponding to the visceral blockage point. The average value of the filth blockage percentages of all the filth blockage points is calculated, so that the filth blockage percentage of the filth blockage region, namely the whole filth blockage degree of the filth blockage region, can be accurately known.
In this technical scheme, judge the dirty stifled degree of air conditioner filter screen according to the dirty stifled percentage in dirty stifled region includes: acquiring the accumulated operation time length of the cross-flow fan blade; judging the filth blockage degree of the air conditioner filter screen according to the relationship between the filth blockage percentage of the filth blockage region and the filth blockage threshold value if the relationship between the filth blockage percentage of the filth blockage region and the filth blockage threshold value meets the filth blockage condition and the accumulated running time length of the through-flow fan blade is longer than or equal to the second time length; and if the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value meets the dirty blocking condition but the accumulated running time length of the cross-flow fan blades is smaller than the second time length, judging that the air conditioner filter screen is blocked by foreign matters.
The technical effect achieved after the technical scheme is adopted is as follows: it can be appreciated that the filter screen filth blockage of the air conditioner needs a certain time to accumulate. If the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value meets the dirty blocking condition but the accumulated running time of the cross-flow fan blades is smaller than the second time, the fact that the air conditioner filter screen is blocked by foreign matters at the moment is indicated, and the dirty blocking does not really occur. If the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value meets the dirty blocking condition and the accumulated running time length of the through-flow fan blade is longer than or equal to the second time length, the accumulated running time length of the through-flow fan blade is indicated to meet the dirty blocking condition, and therefore the dirty blocking degree of the air conditioner filter screen is judged according to the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value.
In this technical scheme, dirty stifled threshold value includes first dirty stifled threshold value and second dirty stifled threshold value, the dirty stifled degree of judgement air conditioner filter screen is including according to dirty stifled regional dirty stifled percentage with the size relation of dirty stifled threshold value: if P is less than or equal to P1, judging that the filth blockage degree of the air conditioner filter screen is slight filth blockage; if P1 is more than P repair and less than or equal to P2, judging that the filth blockage degree of the air conditioner filter screen is moderate filth blockage; if P repair is more than P2, judging that the filth blockage degree of the air conditioner filter screen is heavy filth blockage; wherein P1 is a first visceral occlusion threshold; p2 is the second visceral occlusion threshold.
The technical effect achieved after the technical scheme is adopted is as follows: by setting the first and second clogging threshold values, the clogging degree of the clogging region can be distinguished. Specifically, if P is less than or equal to P1, the filter screen of the air conditioner is slightly blocked; if P1 is more than P repair and less than or equal to P2, indicating that the filth blockage degree of the air conditioner filter screen is moderate filth blockage; if P repair is more than P2, the dirty blocking degree of the air conditioner filter screen is heavy dirty blocking.
In this technical scheme, the dirty stifled detection method of air conditioner filter screen still includes: if the air conditioner filter screen is shielded by the foreign matter, a foreign matter shielding prompt tone is sent out to prompt a user to remove the shielding object.
The technical effect achieved after the technical scheme is adopted is as follows: under the condition that the air conditioner filter screen is shielded by foreign matters, a user can be prompted to remove the shielding object by emitting foreign matters shielding sound, and the phenomenon that the air outlet is reduced due to shielding of the air inlet by the foreign matters is avoided, so that the heat exchange effect of the air conditioner is affected.
In this technical scheme, the dirty stifled detection method of air conditioner filter screen still includes: if the filth blockage degree of the air conditioner filter screen is light filth blockage or medium filth blockage, the electric auxiliary heating device is turned off, and the air conditioner is controlled to enter a filter screen self-cleaning mode; if the dirt blocking degree of the air conditioner filter screen is heavy dirt blocking, the electric auxiliary heating device is turned off, and the air conditioner is controlled to send out filter screen cleaning warning voice so as to remind a user to manually clean or replace the air conditioner filter screen.
The technical effect achieved after the technical scheme is adopted is as follows: if the filth blockage degree of the air conditioner filter screen is light filth blockage or medium filth blockage, the filth blockage degree of the air conditioner filter screen is not serious, the air conditioner filter screen can be automatically cleared through a filter screen self-cleaning mode, manual replacement or cleaning is not needed, and the electric auxiliary heating device is turned off to control the air conditioner to enter the filter screen self-cleaning mode. If the dirt blocking degree of the air conditioner filter screen is heavy dirt blocking, the fact that the dirt blocking degree of the air conditioner filter screen is serious at the moment is indicated, and the air conditioner filter screen cannot be cleaned up through a self-cleaning mode of the filter screen is indicated, so that the electric auxiliary heating device is turned off, the air conditioner is controlled to send out filter screen cleaning warning voice, and a user is reminded of manually cleaning or replacing the air conditioner filter screen.
The technical scheme provides an air conditioner filter screen dirty and blocked detection system which realizes the air conditioner filter screen dirty and blocked detection method according to any one of the technical schemes, and the air conditioner filter screen dirty and blocked detection system comprises: the control module is used for controlling the air conditioner to run for a first time period in a filter screen filth blockage detection state; the viscera temperature difference value calculation module is used for acquiring a first temperature change value of the temperature of the indoor coil in the first time period and a second temperature change value of each temperature measuring point in the first time period; calculating the visceral blockage temperature difference value of each temperature measuring point according to the first temperature change value and the second temperature change value; the dirty block point judging module is used for judging that the temperature measuring point corresponding to the dirty block temperature difference value is a dirty block point under the condition that the dirty block temperature difference value is larger than the dirty block temperature difference reference value; the filter screen dirty blocking degree judging module is used for determining the dirty blocking percentage of the dirty blocking area according to the dirty blocking temperature difference value corresponding to each dirty blocking point and the number of the dirty blocking points; judging the filth blocking degree of the filter screen of the air conditioner according to the filth blocking percentage of the filth blocking area; wherein, ti1= (Δtp- Δtci1)/Δtci1; ti1 is the visceral temperature difference value of the ith temperature measuring point; Δtp is the first temperature change value; Δtci1 is the second temperature change value of the ith temperature measurement point; when the air conditioner runs in a filter screen filth blockage detection state, the compressor is in a closed state, and the electric auxiliary heating device and the cross-flow fan blade are in an open state.
The technical scheme provides a dirty stifled detecting system of air conditioner filter screen, include: the air conditioner filter screen filth blockage detection method comprises a processor, a memory and a program or an instruction which is stored in the memory and can run on the processor, wherein the program or the instruction realizes the air conditioner filter screen filth blockage detection method according to any one of the technical schemes when being executed by the processor.
In summary, the foregoing embodiments of the present application may have one or more of the following advantages or benefits:
(1) When the air conditioner runs in the filter screen filth blockage detection state, the compressor is in the closed state, so that the temperature of the indoor coil and the temperature value at the temperature measuring point are not influenced by the running state of the compressor. At the moment, the electric auxiliary heating device and the through-flow fan blades are in an opening state, when the filter screen of the air conditioner is not blocked, a part of heat generated by the electric auxiliary heating device is blown into a room through the through-flow fan blades, so that the temperature of a temperature measuring point is increased, and a part of heat is transferred to the indoor coil pipe, so that the temperature of the indoor coil pipe is increased. Along with the gradual dirty blocking of the filter screen, the air outlet quantity at the air inlet of the air conditioner is gradually reduced, and the heat generated by electric auxiliary heat cannot be emitted, so that the first temperature change value of the indoor coil pipe temperature in the first time period is higher than the second temperature change value at the temperature measuring point. Operating the air conditioner in a filter screen filth blockage detection state for a first time period by controlling the air conditioner; acquiring a first temperature change value of the temperature of the indoor coil in a first time period and a second temperature change value of each temperature measuring point in the first time period; the method comprises the steps of calculating the dirty block temperature difference value Ti1= (delta Tp-delta Tci 1)/delta Tci1 of each temperature measurement point according to a first temperature change value and a second temperature change value, screening out dirty block points from a plurality of temperature measurement points according to the size relation between the dirty block temperature difference value and the dirty block temperature difference reference value, determining the dirty block percentage of dirty block areas according to the number of the dirty block temperature difference values and the dirty block points of each dirty block point, determining the dirty block degree of the air conditioner filter screen according to the dirty block percentage of the dirty block areas, and avoiding inaccurate dirty block detection results of the filter screen caused by the influence of the installation position of the temperature detection device when only one temperature detection device is arranged at the air conditioner air inlet, judging the dirty block degree of the air conditioner filter screen according to the average value of the dirty block temperature difference values of all the temperature measurement points, so that the actual dirty block degree of the air conditioner filter screen is higher than the detected dirty block degree, and the air conditioner filter screen has local dirty block but the detection result shows that the air conditioner filter screen has no dirty block problem.
(2) Under the condition that the air conditioner is electrified for the first time, the filter screen of the air conditioner is in a state of no filth blockage, and the first temperature change reference value and the second area temperature change reference value when the filter screen of the air conditioner is in the state of no filth blockage can be obtained by controlling the air conditioner to operate for a first time in a state of filth blockage detection of the filter screen at the moment, and then the filth blockage temperature difference reference value can be calculated according to the first temperature change reference value and the second area temperature change reference value. By taking the average value of the second temperature change reference values of the temperature measuring points as the second area temperature change reference value, the calculation accuracy of the second area temperature change reference value can be improved, and the problem that the calculated visceral temperature difference reference value is inaccurate due to the fact that the second temperature change reference value of a single temperature measuring point is taken as the second area temperature change reference value is avoided.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic flow chart of a method for detecting filth blockage of a filter screen of an air conditioner.
Detailed Description
The following description of the technical solutions in the embodiments of the present invention will be clear and complete, and it is obvious that the described embodiments are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1, a flow chart of a method for detecting filth blockage of a filter screen of an air conditioner provided by the invention is shown. The air conditioner air inlet grille is provided with a temperature measuring points, and the air conditioner filter screen filth blockage detection method comprises the following steps: controlling the air conditioner to operate for a first time period in a filter screen filth blockage detection state; acquiring a first temperature change value of the indoor coil temperature in the first time period and a second temperature change value of each temperature measuring point in the first time period; calculating the visceral blockage temperature difference value of each temperature measuring point according to the first temperature change value and the second temperature change value; if the viscera blockage temperature difference value is larger than the viscera blockage temperature difference reference value, judging that the temperature measuring point corresponding to the viscera blockage temperature difference value is a viscera blockage point; determining the visceral blockage percentage of the visceral blockage area according to the visceral blockage temperature difference value corresponding to each visceral blockage point and the number of the visceral blockage points; judging the filth blocking degree of the filter screen of the air conditioner according to the filth blocking percentage of the filth blocking area; wherein, ti1= (Δtp- Δtci1)/Δtci1; ti1 is the visceral temperature difference value of the ith temperature measuring point; Δtp is the first temperature change value; Δtci1 is the second temperature change value of the ith temperature measurement point; when the air conditioner runs in a filter screen filth blockage detection state, the compressor is in a closed state, and the electric auxiliary heating device and the cross-flow fan blade are in an open state.
It can be understood that, because the compressor is in the off state when the air conditioner is operated in the filter screen filth blockage detection state, the temperature of the indoor coil and the temperature value at the temperature measuring point are not affected by the operation state of the compressor. At the moment, the electric auxiliary heating device and the through-flow fan blades are in an opening state, when the filter screen of the air conditioner is not blocked, a part of heat generated by the electric auxiliary heating device is blown into a room through the through-flow fan blades, so that the temperature of a temperature measuring point is increased, and a part of heat is transferred to the indoor coil pipe, so that the temperature of the indoor coil pipe is increased. Along with the gradual dirty blocking of the filter screen, the air outlet quantity at the air inlet of the air conditioner is gradually reduced, and the heat generated by electric auxiliary heat cannot be emitted, so that the first temperature change value of the indoor coil pipe temperature in the first time period is higher than the second temperature change value at the temperature measuring point. Operating the air conditioner in a filter screen filth blockage detection state for a first time period by controlling the air conditioner; acquiring a first temperature change value of the temperature of the indoor coil in a first time period and a second temperature change value of each temperature measuring point in the first time period; the method comprises the steps of calculating the dirty block temperature difference value Ti1= (delta Tp-delta Tci 1)/delta Tci1 of each temperature measurement point according to a first temperature change value and a second temperature change value, screening out dirty block points from a plurality of temperature measurement points according to the size relation between the dirty block temperature difference value and the dirty block temperature difference reference value, determining the dirty block percentage of dirty block areas according to the number of the dirty block temperature difference values and the dirty block points of each dirty block point, determining the dirty block degree of the air conditioner filter screen according to the dirty block percentage of the dirty block areas, and avoiding inaccurate dirty block detection results of the filter screen caused by the influence of the installation position of the temperature detection device when only one temperature detection device is arranged at the air conditioner air inlet, judging the dirty block degree of the air conditioner filter screen according to the average value of the dirty block temperature difference values of all the temperature measurement points, so that the actual dirty block degree of the air conditioner filter screen is higher than the detected dirty block degree, and the air conditioner filter screen has local dirty block but the detection result shows that the air conditioner filter screen has no dirty block problem.
Further, the method for detecting dirt blocking of the air conditioner filter screen further comprises the following steps: under the condition that the air conditioner is electrified for the first time, controlling the air conditioner to run for the first time in the filth blockage detection state of the filter screen so as to acquire and store the filth blockage temperature difference reference value; acquiring a first temperature change value of the temperature of the indoor coil pipe within the first duration, and recording the first temperature change value as a first temperature change reference value; acquiring a second temperature change value of each temperature measuring point in the first time period, marking the second temperature change value as a second temperature change reference value, calculating an average value of the second temperature change reference values, and marking the average value as a second area temperature change reference value; calculating the visceral temperature difference reference value according to the first temperature change reference value and the second temperature change reference value; wherein t0= (Δtp0- Δtc)/Δtc; Δtc=1/n Σ n 1 ΔTci0，i∈[1，n]The method comprises the steps of carrying out a first treatment on the surface of the T0 is a visceral blockage temperature difference reference value; Δtp0 is a first temperature change reference value; ΔTc is a second zone temperature change reference value; Δtci0 is the second temperature change reference value of the i-th temperature measurement point; n is the number of temperature measuring points.
It can be understood that, under the condition that the air conditioner is powered on for the first time, the filter screen of the air conditioner is in a state of no filth blockage, and the first temperature change reference value and the second area temperature change reference value when the filter screen of the air conditioner is in a state of no filth blockage can be obtained by controlling the air conditioner to operate for a first time period in a state of filth blockage detection of the filter screen at this time, and then the filth blockage temperature difference reference value can be calculated according to the first temperature change reference value and the second area temperature change reference value. By taking the average value of the second temperature change reference values of the temperature measuring points as the second area temperature change reference value, the calculation accuracy of the second area temperature change reference value can be improved, and the problem that the calculated visceral temperature difference reference value is inaccurate due to the fact that the second temperature change reference value of a single temperature measuring point is taken as the second area temperature change reference value is avoided.
Further, determining the blocking percentage of the blocking area according to the blocking temperature difference value corresponding to each blocking point and the number of blocking points includes: determining the dirty blocking percentage of each dirty blocking point according to the dirty blocking temperature difference value corresponding to each dirty blocking point and the dirty blocking temperature difference reference value; and determining the visceral blockage percentage of the visceral blockage area according to the visceral blockage percentage of each visceral blockage point and the number of the visceral blockage points.
It can be understood that the filth blockage percentage of each filth blockage point, that is, the filth blockage degree of each filth blockage point can be accurately known according to the filth blockage temperature difference value corresponding to each filth blockage point and the filth blockage temperature difference reference value; and further, the visceral blocking percentage of the visceral blocking area, namely the whole visceral blocking degree of the visceral blocking area, can be determined according to the visceral blocking degree of each visceral blocking point and the number of the visceral blocking points. By comprehensively considering the degree of the blockage and the number of the blockage points, the blockage degree of the blockage region can be calculated more accurately.
Further, the determining the blocking percentage of the blocking area according to the blocking percentage of each blocking point and the number of blocking points includes: pj=100% (Ti 1-T0)/T0; p=1/m Σ m 1 aj，j∈[1，m]The method comprises the steps of carrying out a first treatment on the surface of the Wherein, pj is the difference value of the visceral blockage temperature corresponding to the jth visceral blockage point; m is the number of visceral plugging points; p is the percentage of visceral occlusion in the visceral occlusion area.
It can be understood that the greater the difference between the difference value of the temperature measurement point and the reference value of the temperature difference of the visceral blockage, the greater the percentage of visceral blockage corresponding to the visceral blockage point, and the greater the visceral blockage degree corresponding to the visceral blockage point. The average value of the filth blockage percentages of all the filth blockage points is calculated, so that the filth blockage percentage of the filth blockage region, namely the whole filth blockage degree of the filth blockage region, can be accurately known.
Further, the judging the filth blockage degree of the filter screen of the air conditioner according to the filth blockage percentage of the filth blockage area comprises: acquiring the accumulated operation time length of the cross-flow fan blade; judging the filth blockage degree of the air conditioner filter screen according to the relationship between the filth blockage percentage of the filth blockage region and the filth blockage threshold value if the relationship between the filth blockage percentage of the filth blockage region and the filth blockage threshold value meets the filth blockage condition and the accumulated running time length of the through-flow fan blade is longer than or equal to the second time length; and if the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value meets the dirty blocking condition but the accumulated running time length of the cross-flow fan blades is smaller than the second time length, judging that the air conditioner filter screen is blocked by foreign matters.
It can be appreciated that the filter screen filth blockage of the air conditioner needs a certain time to accumulate. If the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value meets the dirty blocking condition but the accumulated running time of the cross-flow fan blades is smaller than the second time, the fact that the air conditioner filter screen is blocked by foreign matters at the moment is indicated, and the dirty blocking does not really occur. If the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value meets the dirty blocking condition and the accumulated running time length of the through-flow fan blade is longer than or equal to the second time length, the accumulated running time length of the through-flow fan blade is indicated to meet the dirty blocking condition, and therefore the dirty blocking degree of the air conditioner filter screen is judged according to the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value.
Further, the dirty blocking threshold includes a first dirty blocking threshold and a second dirty blocking threshold, and determining the dirty blocking degree of the air conditioner filter screen according to the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold includes: if P is less than or equal to P1, judging that the filth blockage degree of the air conditioner filter screen is slight filth blockage; if P1 is more than P repair and less than or equal to P2, judging that the filth blockage degree of the air conditioner filter screen is moderate filth blockage; if P repair is more than P2, judging that the filth blockage degree of the air conditioner filter screen is heavy filth blockage; wherein P1 is a first visceral occlusion threshold; p2 is the second visceral occlusion threshold.
It is understood that the degree of clogging in the clogged region can be distinguished by setting the clogging threshold to the form of the first clogging threshold and the second clogging threshold. Specifically, if P is less than or equal to P1, the filter screen of the air conditioner is slightly blocked; if P1 is more than P repair and less than or equal to P2, indicating that the filth blockage degree of the air conditioner filter screen is moderate filth blockage; if P repair is more than P2, the dirty blocking degree of the air conditioner filter screen is heavy dirty blocking.
Further, the method for detecting dirt blocking of the air conditioner filter screen further comprises the following steps: if the air conditioner filter screen is shielded by the foreign matter, a foreign matter shielding prompt tone is sent out to prompt a user to remove the shielding object.
It can be understood that under the condition that the air conditioner filter screen is shielded by the foreign matters, the user can be prompted to remove the shielding object by sending out the foreign matters shielding sound, and the air outlet reduction caused by shielding the air inlet by the foreign matters is avoided, so that the heat exchange effect of the air conditioner is influenced.
Further, the method for detecting dirt blocking of the air conditioner filter screen further comprises the following steps: if the filth blockage degree of the air conditioner filter screen is light filth blockage or medium filth blockage, the electric auxiliary heating device is turned off, and the air conditioner is controlled to enter a filter screen self-cleaning mode; if the dirt blocking degree of the air conditioner filter screen is heavy dirt blocking, the electric auxiliary heating device is turned off, and the air conditioner is controlled to send out filter screen cleaning warning voice so as to remind a user to manually clean or replace the air conditioner filter screen.
In a specific embodiment, after the filter screen is automatically cleaned each time and after the filter screen of the air conditioner is manually cleaned or replaced each time, the filth blockage temperature difference reference value is updated and the accumulated running time of the through-flow fan blades is cleared, so that the problem that the stored filth blockage temperature difference reference value is not applicable any more when the filter screen state changes to cause the first power-on of the air conditioner is avoided, and the accuracy of filth blockage detection of the filter screen of the air conditioner is ensured.
It can be understood that if the filth blockage degree of the air conditioner filter screen is light filth blockage or medium filth blockage, the filth blockage degree of the air conditioner filter screen is not serious, the air conditioner filter screen can be automatically cleared through the filter screen self-cleaning mode, manual replacement or cleaning is not needed, and the electric auxiliary heating device is turned off to control the air conditioner to enter the filter screen self-cleaning mode. If the dirt blocking degree of the air conditioner filter screen is heavy dirt blocking, the fact that the dirt blocking degree of the air conditioner filter screen is serious at the moment is indicated, and the air conditioner filter screen cannot be cleaned up through a self-cleaning mode of the filter screen is indicated, so that the electric auxiliary heating device is turned off, the air conditioner is controlled to send out filter screen cleaning warning voice, and a user is reminded of manually cleaning or replacing the air conditioner filter screen.
Further, this embodiment provides a dirty plug detection system of an air conditioner filter screen, which implements any one of the dirty plug detection methods of the air conditioner filter screen as described above, and the dirty plug detection system of the air conditioner filter screen includes: the control module is used for controlling the air conditioner to run for a first time period in a filter screen filth blockage detection state; the viscera temperature difference value calculation module is used for acquiring a first temperature change value of the temperature of the indoor coil in the first time period and a second temperature change value of each temperature measuring point in the first time period; calculating the visceral blockage temperature difference value of each temperature measuring point according to the first temperature change value and the second temperature change value; the dirty block point judging module is used for judging that the temperature measuring point corresponding to the dirty block temperature difference value is a dirty block point under the condition that the dirty block temperature difference value is larger than the dirty block temperature difference reference value; the filter screen dirty blocking degree judging module is used for determining the dirty blocking percentage of the dirty blocking area according to the dirty blocking temperature difference value corresponding to each dirty blocking point and the number of the dirty blocking points; judging the filth blocking degree of the filter screen of the air conditioner according to the filth blocking percentage of the filth blocking area; wherein, ti1= (Δtp- Δtci1)/Δtci1; ti1 is the visceral temperature difference value of the ith temperature measuring point; Δtp is the first temperature change value; Δtci1 is the second temperature change value of the ith temperature measurement point; when the air conditioner runs in a filter screen filth blockage detection state, the compressor is in a closed state, and the electric auxiliary heating device and the cross-flow fan blade are in an open state.
Further, this embodiment provides a dirty stifled detecting system of air conditioner filter screen, and this dirty stifled detecting system of air conditioner filter screen includes: the air conditioner filter screen filth blockage detection device comprises a processor, a memory and a program or an instruction stored in the memory and capable of running on the processor, wherein the program or the instruction realizes any one of the air conditioner filter screen filth blockage detection methods when being executed by the processor.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and are not limiting; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A method for detecting filth blockage of an air conditioner filter screen is characterized in that the air conditioner filter screen is arranged on an air inlet grid of an air conditioner, and a plurality of temperature measuring points are distributed at the air inlet grid of the air conditioner; the method for detecting the filth blockage of the air conditioner filter screen comprises the following steps:
controlling the air conditioner to operate for a first time period in a filter screen filth blockage detection state;
acquiring a first temperature change value of the indoor coil temperature in the first time period and a second temperature change value of each temperature measuring point in the first time period;
calculating the visceral blockage temperature difference value of each temperature measuring point according to the first temperature change value and the second temperature change value;
if the viscera blockage temperature difference value is larger than the viscera blockage temperature difference reference value, judging that the temperature measuring point corresponding to the viscera blockage temperature difference value is a viscera blockage point;
determining the visceral blockage percentage of the visceral blockage area according to the visceral blockage temperature difference value corresponding to each visceral blockage point and the number of the visceral blockage points;
judging the filth blocking degree of the filter screen of the air conditioner according to the filth blocking percentage of the filth blocking area;
wherein, ti1= (Δtp- Δtci1)/Δtci1; ti1 is the visceral temperature difference value of the ith temperature measuring point; Δtp is the first temperature change value; Δtci1 is the second temperature change value of the ith temperature measurement point; when the air conditioner runs in a filter screen filth blockage detection state, the compressor is in a closed state, and the electric auxiliary heating device and the cross-flow fan blade are in an open state.
2. The method for detecting filth blockage of an air conditioner filter according to claim 1, further comprising:
under the condition that the air conditioner is electrified for the first time, controlling the air conditioner to run for the first time in the filth blockage detection state of the filter screen so as to acquire and store the filth blockage temperature difference reference value;
acquiring a first temperature change value of the temperature of the indoor coil pipe within the first duration, and recording the first temperature change value as a first temperature change reference value;
acquiring a second temperature change value of each temperature measuring point in the first time period, marking the second temperature change value as a second temperature change reference value, calculating an average value of the second temperature change reference values, and marking the average value as a second area temperature change reference value;
calculating the visceral temperature difference reference value according to the first temperature change reference value and the second temperature change reference value;
wherein t0= (Δtp0- Δtc)/Δtc; Δtc=1/n Σ n 1 ΔTci0，i∈[1，n]The method comprises the steps of carrying out a first treatment on the surface of the T0 is a visceral blockage temperature difference reference value; Δtp0 is a first temperature change reference value; ΔTc is a second zone temperature change reference value; Δtci0 is the second temperature change reference value of the i-th temperature measurement point; n is the number of temperature measuring points.
3. The method for detecting a filth blockage of an air conditioner filter screen according to claim 2, wherein determining a filth blockage percentage of a filth blockage region according to a filth blockage temperature difference value corresponding to each filth blockage point and the number of filth blockage points comprises:
determining the dirty blocking percentage of each dirty blocking point according to the dirty blocking temperature difference value corresponding to each dirty blocking point and the dirty blocking temperature difference reference value;
and determining the visceral blockage percentage of the visceral blockage area according to the visceral blockage percentage of each visceral blockage point and the number of the visceral blockage points.
4. The method for detecting a filth blockage of an air conditioner filter according to claim 3, wherein determining the filth blockage percentage of the filth blockage region according to the filth blockage percentage of each filth blockage point and the number of filth blockage points comprises:
Pj＝100％*(Ti1-T0)/T0；
P＝1/m∑ m 1 aj，j∈[1，m]；
wherein, pj is the difference value of the visceral blockage temperature corresponding to the jth visceral blockage point; m is the number of visceral plugging points; p is the percentage of visceral occlusion in the visceral occlusion area.
5. The method for detecting filth blockage of an air conditioner filter according to claim 4, wherein the determining the filth blockage degree of the air conditioner filter according to the filth blockage percentage of the filth blockage region comprises:
acquiring the accumulated operation time length of the cross-flow fan blade;
judging the filth blockage degree of the air conditioner filter screen according to the relationship between the filth blockage percentage of the filth blockage region and the filth blockage threshold value if the relationship between the filth blockage percentage of the filth blockage region and the filth blockage threshold value meets the filth blockage condition and the accumulated running time length of the through-flow fan blade is longer than or equal to the second time length;
and if the size relation between the dirty blocking percentage of the dirty blocking area and the dirty blocking threshold value meets the dirty blocking condition but the accumulated running time length of the cross-flow fan blades is smaller than the second time length, judging that the air conditioner filter screen is blocked by foreign matters.
6. The method for detecting filth blockage of an air conditioner filter according to claim 5, wherein the filth blockage threshold comprises a first filth blockage threshold and a second filth blockage threshold, and the determining the filth blockage degree of the air conditioner filter according to the relationship between the filth blockage percentage of the filth blockage region and the filth blockage threshold comprises:
if P is less than or equal to P1, judging that the filth blockage degree of the air conditioner filter screen is slight filth blockage;
if P1 is more than P repair and less than or equal to P2, judging that the filth blockage degree of the air conditioner filter screen is moderate filth blockage;
if P repair is more than P2, judging that the filth blockage degree of the air conditioner filter screen is heavy filth blockage;
wherein P1 is a first visceral occlusion threshold; p2 is the second visceral occlusion threshold.
7. The method for detecting filth blockage of an air conditioner filter according to claim 5, further comprising:
if the air conditioner filter screen is shielded by the foreign matter, a foreign matter shielding prompt tone is sent out to prompt a user to remove the shielding object.
8. The method for detecting filth blockage of an air conditioner filter according to claim 6, further comprising:
if the filth blockage degree of the air conditioner filter screen is light filth blockage or medium filth blockage, the electric auxiliary heating device is turned off, and the air conditioner is controlled to enter a filter screen self-cleaning mode;
if the dirt blocking degree of the air conditioner filter screen is heavy dirt blocking, the electric auxiliary heating device is turned off, and the air conditioner is controlled to send out filter screen cleaning warning voice so as to remind a user to manually clean or replace the air conditioner filter screen.
9. An air conditioner filter screen filth blockage detection system, which is characterized in that the air conditioner filter screen filth blockage detection system realizes the air conditioner filter screen filth blockage detection method according to any one of claims 1-8, and the air conditioner filter screen filth blockage detection system comprises:
the control module is used for controlling the air conditioner to run for a first time period in a filter screen filth blockage detection state;
the viscera temperature difference value calculation module is used for acquiring a first temperature change value of the temperature of the indoor coil in the first time period and a second temperature change value of each temperature measuring point in the first time period; calculating the visceral blockage temperature difference value of each temperature measuring point according to the first temperature change value and the second temperature change value;
the dirty block point judging module is used for judging that the temperature measuring point corresponding to the dirty block temperature difference value is a dirty block point under the condition that the dirty block temperature difference value is larger than the dirty block temperature difference reference value;
the filter screen dirty blocking degree judging module is used for determining the dirty blocking percentage of the dirty blocking area according to the dirty blocking temperature difference value corresponding to each dirty blocking point and the number of the dirty blocking points; judging the filth blocking degree of the filter screen of the air conditioner according to the filth blocking percentage of the filth blocking area;
wherein, ti1= (Δtp- Δtci1)/Δtci1; ti1 is the visceral temperature difference value of the ith temperature measuring point; Δtp is the first temperature change value; Δtci1 is the second temperature change value of the ith temperature measurement point; when the air conditioner runs in a filter screen filth blockage detection state, the compressor is in a closed state, and the electric auxiliary heating device and the cross-flow fan blade are in an open state.
10. The utility model provides a dirty stifled detecting system of air conditioner filter screen which characterized in that, the dirty stifled detecting system of air conditioner filter screen includes: a processor, a memory, and a program or instruction stored in the memory and executable on the processor, the program or instruction implementing the method for detecting filth blockage of an air conditioner filter screen according to any one of claims 1 to 8 when executed by the processor.
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