CN111043711A - Air conditioner filter screen filth blockage detection method and device and air conditioner - Google Patents
Air conditioner filter screen filth blockage detection method and device and air conditioner Download PDFInfo
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- CN111043711A CN111043711A CN201911412498.1A CN201911412498A CN111043711A CN 111043711 A CN111043711 A CN 111043711A CN 201911412498 A CN201911412498 A CN 201911412498A CN 111043711 A CN111043711 A CN 111043711A
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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
- F24F11/62—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
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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
- F24F11/72—Control systems characterised by their outputs; Constructional details thereof for controlling the supply of treated air, e.g. its pressure
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/83—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers
- F24F11/84—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling the supply of heat-exchange fluids to heat-exchangers using valves
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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
- F24F11/80—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air
- F24F11/86—Control systems characterised by their outputs; Constructional details thereof for controlling the temperature of the supplied air by controlling compressors within refrigeration or heat pump circuits
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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
- F24F11/88—Electrical aspects, e.g. circuits
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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
- F24F2110/00—Control inputs relating to air properties
- F24F2110/10—Temperature
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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
- F24F2140/00—Control inputs relating to system states
- F24F2140/20—Heat-exchange fluid temperature
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Abstract
The invention provides an air conditioner filter screen filth blockage detection method, a detection device and an air conditioner, relating to the technical field of air conditioners and comprising the following steps: detecting the ambient temperature and the evaporator temperature in real time after the compressor is started; determining a first temperature difference, and when the first temperature difference is equal to a first preset temperature value, closing the compressor and controlling the operation of the inner fan; recording the first time length, and judging whether the filter screen is dirty or not according to the first time length; or when the compressor is closed, the inner fan is controlled to operate for a second time, a second temperature difference is determined, and whether the filter screen is dirty or blocked is judged according to the second temperature difference. According to the air conditioner filter screen filth blockage detection method, the detection device and the air conditioner, the detection and judgment process is more accurate by setting the control program and the judgment process through the existing sensor and controller of the air conditioner; the air conditioner needs no additional equipment, does not change the original structure of the air conditioner, and saves the cost.
Description
Technical Field
The invention relates to the technical field of air conditioners, in particular to a filth blockage detection method and device for a filter screen of an air conditioner and the air conditioner.
Background
After the air conditioner is used for a period of time, the filter screen can be filthy blocked, the air conditioner is in different environments, and the filthy blockage degree and the filthy blockage speed are different. The filter screen is dirty and blocked, so that the air duct environment of an indoor unit of the air conditioner is deteriorated, the air volume is reduced, the heat exchange efficiency of an evaporator and indoor air is influenced, the energy consumption is increased, and the refrigerating and heating time is prolonged. In addition, a large amount of dust accumulates on the filter screen, which easily generates odor, and deteriorates the perception of the user using the air conditioner.
At present, various methods for measuring the filth blockage condition of a filter screen exist in an air conditioner, but the detection process is relatively complex, and the detection device is also relatively complex, so that misjudgment is easy to occur, and a user cannot clean the filter screen in time.
Disclosure of Invention
The invention solves the problems that the existing detection device and detection method for filth blockage of the filter screen are complex, the cost is increased, the air conditioner structure is changed, and misjudgment occurs, so that a user cannot clean the filter screen in time.
In order to solve the above problems, the present invention provides a filth blockage detection method for a filter screen of an air conditioner, comprising:
detecting the ambient temperature and the evaporator temperature in real time after the compressor is started;
determining a first temperature difference according to the ambient temperature and the evaporator temperature, and when the first temperature difference is equal to a first preset temperature value, closing a compressor and controlling an inner fan to operate, wherein the first temperature difference is the absolute value of the temperature difference between the ambient temperature and the evaporator temperature;
recording a first time length from the moment when the compressor is closed to the moment when the temperature of the evaporator is equal to the ambient temperature, and judging whether the filter screen is dirty and blocked according to the first time length; or when the compressor is closed, controlling the inner fan to operate for a second time, determining a second temperature difference according to the evaporator temperature and the ambient temperature at the end time of the second time, and judging whether the filter screen is dirty or not according to the second temperature difference, wherein the second temperature difference is the absolute value of the temperature difference between the ambient temperature and the evaporator temperature.
The invention provides a filth blockage detection method for a filter screen of an air conditioner, which can judge whether the filter screen is filth blocked or not by setting a control program and a judgment process through an existing ambient temperature sensor, an existing evaporator temperature sensor, a controller and other devices of the air conditioner, and has the advantages of more accurate detection and judgment process and reduction of misjudgment; and no additional equipment is needed, the original structure of the air conditioner is not changed, the cost is reduced, and the refrigeration and heating performance of the air conditioner is not influenced.
Optionally, the determining whether the filter screen is dirty or not according to the first duration includes:
judging whether the first time length is greater than or equal to a preset time length, if so, judging that the filter screen is dirty and blocked; if not, judging that the filter screen is not dirty and blocked; the judgment process is simple and accurate.
Optionally, the determining whether the filter screen is dirty or not according to the second temperature difference includes:
judging whether the second temperature difference is larger than a second preset temperature value or not, and if so, judging that the filter screen is dirty and blocked; if not, judging that the filter screen is not dirty and blocked; the judgment process is simple and accurate.
Optionally, the method further comprises: and after the compressor is started, judging whether to control the four-way reversing valve to reverse or not according to the ambient temperature.
Control the four-way reversing valve through ambient temperature, prevent that ambient temperature from continuing to reduce the evaporimeter temperature when lower to and prevent that ambient temperature from continuing to rise the evaporimeter temperature when higher, the unable required variation that reaches of evaporimeter temperature, and protect devices such as compressor and evaporimeter.
Optionally, the determining whether to control the four-way reversing valve to reverse according to the ambient temperature includes:
judging whether the ambient temperature is lower than a third preset temperature value or not, if so, controlling the four-way reversing valve to reverse, and being suitable for controlling the flow direction of a refrigerant to increase the temperature of the evaporator; if not, controlling the four-way reversing valve not to reverse, and being suitable for controlling the flow direction of the refrigerant to reduce the temperature of the evaporator; the judgment process is simple, and the temperature rise and the temperature fall of the evaporator can be effectively and reasonably controlled.
Optionally, the method further comprises:
judging the filth blockage degree of the filter screen according to a first degree interval in which the first time length falls, wherein the first degree interval comprises a plurality of subintervals K1... Ka... Ke, determining the subinterval Ka in which the first time length falls, and acquiring a filth blockage degree command corresponding to the subinterval Ka;
and a is more than or equal to 1 and less than or equal to e, the subinterval Ka corresponds to different dirty degree commands, and the larger the value of a is, the larger the dirty degree corresponding to the dirty degree command of the subinterval Ka is.
The filth blockage degree is accurately detected and judged, accurate data of the filth blockage degree is obtained, the accurate data can be displayed for a user, the filth blockage condition of the air conditioner is informed to the user, and whether the cleaning is needed or not is selected according to the self requirement of the user.
Optionally, the method further comprises:
judging the dirty blockage degree of the filter screen according to a second degree interval in which the second temperature difference falls, wherein the second degree interval comprises a plurality of subintervals L1.. Lb... Ln, determining the subinterval Lb in which the second temperature falls, and acquiring a dirty blockage degree command corresponding to the subinterval Lb;
b is more than or equal to 1 and less than or equal to n, the subinterval Lb corresponds to different dirty degree commands, and the larger the value of b is, the larger the dirty degree corresponding to the dirty degree command of the subinterval Lb is.
The filth blockage degree is accurately detected and judged, accurate data of the filth blockage degree is obtained, the accurate data can be displayed for a user, the filth blockage condition of the air conditioner is informed to the user, and whether the cleaning is needed or not is selected according to the self requirement of the user.
The utility model provides an air conditioner filter screen filth blocks up detection device which characterized in that includes:
a detection unit for detecting an ambient temperature and an evaporator temperature;
a calculation unit for calculating a first temperature difference and a second temperature difference between the ambient temperature and the evaporator temperature;
the control unit is used for closing the compressor and controlling the operation of the inner fan when the first temperature difference is equal to a first preset temperature value;
the control unit is also used for recording a first time length from the moment when the compressor is closed to the moment when the temperature of the evaporator is equal to the ambient temperature, and judging whether the air conditioner is dirty and blocked according to the first time length; or when the compressor is closed, controlling the inner fan to operate for a second time, calculating a second temperature difference between the evaporator temperature and the ambient temperature at the end moment of the second time, and judging whether the air conditioner is dirty and blocked according to the second temperature difference.
Whether the filter screen is dirty or not can be judged by setting a control program and a judgment process through an existing environment temperature sensor, an evaporator temperature sensor and a controller of the air conditioner, the detection and judgment process is more accurate, and the occurrence of misjudgment is reduced; and no additional equipment is needed, the original structure of the air conditioner is not changed, the cost is reduced, and the refrigeration and heating performance of the air conditioner is not influenced.
The invention further provides a computer-readable storage medium, which stores a computer program, and when the computer program is read and executed by a processor, the method for detecting dirty filter screen blockage according to any one of the above aspects is implemented.
The invention also provides an air conditioner, which comprises a computer readable storage medium and a processor, wherein the computer readable storage medium is used for storing a computer program, and when the computer program is read and executed by the processor, the method for detecting dirty blockage of the filter screen is realized.
The beneficial effects of the computer readable storage medium and the air conditioner in comparison with the prior art are the same as the beneficial effects of the filter screen filth blockage detection method and the filter screen filth blockage detection device in comparison with the prior art, and are not repeated herein.
Drawings
Fig. 1 is a first flow chart of a filter screen filth blockage detection method according to an embodiment of the present invention;
fig. 2 is a flow chart of a filter screen filth blockage detection method according to an embodiment of the present invention;
FIG. 3 is a first flowchart of step S3 according to the embodiment of the present invention;
fig. 4 is a flowchart of a second step S3 according to the embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it should be noted that terms such as "first" and "second" in the embodiments are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
At present, the air conditioner mostly carries out filth blockage detection by various methods such as air pressure at two sides of a filter screen, motor running power or motor running torque, and sensors for measuring various parameters are required to be added, the cost is increased, and the added sensors are difficult to replace after being damaged. And several measurement methods commonly used at present depend on the operation of the air conditioner, and easily receive the change of the environmental condition, causing misjudgment.
The embodiment of the invention provides a filter screen filth blockage detection method, which is shown in a combined figure 1 and comprises the following steps:
step S1, the air conditioner starts a compressor, and detects the ambient temperature T ring and the evaporator temperature T steam in real time;
specifically, when the compressor is started, other devices such as the inner fan and the like can be started in time, preferably, only the compressor is started, so that the temperature of the evaporator is increased or reduced, the environment temperature cannot be changed due to the change of the temperature of the evaporator, and the detection process is more accurate; the environmental temperature refers to the temperature of the environment where the air conditioner is located.
Step S2, determining a first temperature difference △ T1 according to the ambient temperature T ring and the evaporator temperature T steam, when the first temperature difference △ T1 is equal to a first preset temperature value T1, turning off the compressor, and controlling the operation of the internal fan, wherein when the step S1 is operated, the first temperature difference △ T1 is calculated in real time, the first temperature difference △ T1 is compared with the first preset temperature value T1, when the first temperature difference △ T1 is equal to the first preset temperature value T1, the compressor is turned off, and the operation of the internal fan is controlled, wherein when the internal fan is operated in the step S1, the internal fan is turned off in the step S2, and the first temperature difference △ T1 is the absolute value of the temperature difference between the ambient temperature T ring and the evaporator temperature T steam.
S3, recording a first time length T1 from the closing moment of the compressor to the moment when the evaporator temperature Tsteam is equal to the environment temperature Tloop, and judging whether the filter screen is dirty or not according to the first time length;
specifically, in step S2, when the compressor is turned off and the internal fan is running, the evaporator temperature T vapor gradually approaches the ambient temperature T ring and equals to the ambient temperature T ring due to the temperature difference between the ambient temperature T ring and the evaporator temperature T vapor, and in this step S3, the total duration of the time when the evaporator temperature T vapor changes to the time equal to the ambient temperature T ring is recorded as the first duration T1.
The embodiment provides a method for detecting filth blockage of a filter screen, which can judge whether the filter screen is filth blockage or not by setting a control program and a judgment process through a sensor (used for detecting the ambient temperature and the evaporator temperature) and a controller existing in an air conditioner, and the detection and judgment process is more accurate, so that the occurrence of misjudgment is reduced; and no additional equipment is needed, the original structure of the air conditioner is not changed, the cost is reduced, and the refrigeration and heating performance of the air conditioner is not influenced.
Preferably, in step S1, after the air conditioner starts the compressor, it is determined whether to control the four-way reversing valve to reverse according to the ambient temperature, specifically, whether the ambient temperature is lower than a third preset temperature value, if so, the four-way reversing valve is controlled to reverse, and the air conditioner is adapted to control the refrigerant flow direction to raise the temperature of the evaporator; if not, the four-way reversing valve is controlled not to reverse, and the four-way reversing valve is suitable for controlling the flow direction of the refrigerant to reduce the temperature of the evaporator. Control the four-way reversing valve through ambient temperature, prevent that ambient temperature from continuing to reduce the evaporimeter temperature when lower to and prevent that ambient temperature from continuing to rise the evaporimeter temperature when higher, the unable required variation that reaches of evaporimeter temperature, and protect devices such as compressor and evaporimeter.
On the basis of the foregoing embodiment, there is further provided a specific method for determining whether the air conditioner is dirty or not according to the first time duration t1, which is shown in fig. 2:
recording a first time length T1 from the closing moment of the compressor to the moment when the evaporator temperature Tsteam is equal to the environment temperature Tloop, judging whether the first time length T1 is greater than or equal to a preset time length T0, and if so, judging that the filter screen is dirty and blocked; if not, the filter screen is judged to be not dirty and blocked.
When the compressor stops operating and the evaporator only exchanges heat with ambient air, the evaporator meets the formula Q being Cm △ T, wherein Q represents the heat exchange quantity between the evaporator and the indoor air, C represents the specific heat capacity of the evaporator, and m represents the mass of the evaporator, because the values of C, m and △ T (△ T is a first preset temperature value T1 in the embodiment) are not changed, the heat exchange quantity Q between the evaporator and the indoor air is not changed, and at the moment, the longer the time for the evaporator to return to the room temperature (the first time T1 in the embodiment), the smaller the heat exchange quantity between the evaporator and the indoor air in unit time is.
At the moment when the compressor just stops operating, the heat exchange between the evaporator and the indoor air is mainly conducted by convection heat exchange, so that the instant heat exchange quantity q between the evaporator and the indoor air at the moment meets a formula q ═ hS △ T, wherein h represents the convection heat exchange coefficient of the evaporator, S represents the heat exchange area of the evaporator, △ T represents the temperature difference between the evaporator and the indoor environment at the moment when the compressor just stops operating, namely the first preset temperature value T1 in the embodiment, and the smaller q represents the smaller h as the S and △ T are unchanged.
Since the longer the time period for the evaporator to return to the room temperature (the first time period t1 described in this embodiment), the smaller the heat exchange amount between the evaporator and the indoor air per unit time, the smaller the instantaneous heat exchange amount q of the evaporator, and the smaller h, the change of the convective heat exchange coefficient h of the evaporator can be reflected by the change of the time period for the evaporator to return to the room temperature. And because the change of the time length for the evaporator to return to the room temperature is mainly caused by the influence of filth blockage of the filter screen on the air volume of the air conditioner, the filth blockage condition of the filter screen can be judged through the change of t.
The dirtier filter screen is, the smaller the air volume is, the smaller the h is, the smaller the q is, and therefore the longer the time for the evaporator to return to the room temperature is, a preset time t0 is preset, and when t1 is not less than t0, the filter screen is considered to be dirty and blocked, and a user needs to clean the filter screen.
It should be noted that, for different filter screens, the time duration required for the temperature of the evaporator to change to the first preset temperature value T1 (the temperature variation of the evaporator to return to the room temperature) under different degrees of filth blockage is measured through a pre-experiment, and the time duration corresponding to the degree of filth blockage to be cleaned is determined as the preset time duration T0.
Specifically, the present embodiment provides a specific implementation manner, as follows:
step S1, controlling the air conditioner to start the compressor, not starting the inner fan, detecting the temperature Tsteam of the environment temperature T ring and the evaporator in real time, if the environment temperature at the starting moment of the compressor is more than or equal to 19 ℃ (19 ℃ is a better implementation value of a third preset temperature value, and the value range of the third preset temperature value is 16 ℃ to 22 ℃), indicating that the environment temperature is higher, the four-way reversing valve is not reversed, and the temperature of the evaporator is gradually reduced along with the operation of the compressor; if the ambient temperature at the starting time of the compressor is lower than 19 ℃, the ambient temperature is low, the four-way reversing valve reverses, and the temperature of the evaporator gradually rises along with the operation of the compressor;
in the embodiment, the four-way reversing valve is not reversed, for example, the ambient temperature T ring is 35 ℃, and the temperature of the evaporator is gradually reduced along with the operation of the compressor;
step S2, determining a first temperature difference △ T1 according to the ambient temperature T ring and the evaporator temperature T steam, taking the first preset temperature value T1 as 8 ℃, for example, when the first temperature difference △ T1 is equal to the first preset temperature value T1, namely the evaporator temperature T steam is reduced to 27 ℃, closing the compressor and controlling the operation of the inner fan;
step S3, recording a first time length T1 from the compressor closing time to the evaporator temperature tmin being equal to the ambient temperature T-loop time, for example, a first time length T1 from 27 ℃ to 35 ℃ of the evaporator temperature tmin, for example, the first time length T1 is 10min, and the first time length T1(10min) is greater than a preset time length T0 (the preset time length T0 is 6min as an example), which indicates that the heat exchange between the evaporator and the ambient air is smaller than normal and the filter screen is dirty and blocked.
On the basis of the foregoing embodiment, this embodiment further provides a filth blockage degree detection method for a filter screen filth blockage detection method, including: judging the filth blockage degree of the air conditioner according to a first degree interval in which the first time length t1 falls, wherein the first degree interval comprises a plurality of subintervals K1... Ka... Ke, determining the subinterval Ka in which the first time length falls, and acquiring a filth blockage degree command corresponding to the subinterval Ka; wherein 1 is less than e, the subinterval Ka corresponds to different dirty blocking degree commands, a is greater than or equal to 1 and less than or equal to e, and the larger the value of a is, the larger the dirty blocking degree corresponding to the dirty blocking degree command of the subinterval Ka is.
For example, the first degree interval has 5 sub-intervals (e is 5), wherein K1 is [2, 3 ], K2 is [3, 4 ], K3 is [4, 5 ], K4 is [5, 6 "), and K5 is [6, 7); when the first time period t1 is 4.5min, it is judged that the first time period t1 falls within the interval range defined by K3, the degree of visceral congestion corresponding to K1 is 0%, the degree of visceral congestion corresponding to K2 is 25%, the degree of visceral congestion corresponding to K3 is 50%, the degree of visceral congestion corresponding to K4 is 75%, and the degree of visceral congestion corresponding to K5 is 100%, so that the degree of visceral congestion of the filter screen at this time is 50%, and the degree of visceral congestion can be displayed by percentage numbers, colors or bar patterns to inform a user of the degree of visceral congestion.
On the basis of the above embodiment, the present invention provides another embodiment of a method for detecting dirty filter screen clogging, which is shown in fig. 3 and includes:
step S1, the air conditioner starts a compressor, and detects the ambient temperature T ring and the evaporator temperature T steam in real time;
specifically, when the compressor is opened, other devices such as the inner fan can also be opened in good time, better, only the compressor is opened, so that the temperature of the evaporator is increased or reduced, the environment temperature can not change due to the change of the temperature of the evaporator, and the detection process is more accurate.
Step S2, determining a first temperature difference △ T1 according to the ambient temperature T ring and the evaporator temperature T steam, when the first temperature difference △ T1 is equal to a first preset temperature value T1, turning off the compressor, and controlling the operation of the internal fan, wherein when the step S1 is operated, the first temperature difference △ T1 is calculated in real time, the first temperature difference △ T1 is compared with the first preset temperature value T1, when the first temperature difference △ T1 is equal to the first preset temperature value T1, the compressor is turned off, and the operation of the internal fan is controlled, wherein when the internal fan is operated in the step S1, the internal fan is turned off in the step S2, and the first temperature difference △ T1 is the absolute value of the temperature difference between the ambient temperature T ring and the evaporator temperature T steam.
Step S3, when the compressor is closed, controlling the inner fan to operate for a second time period T2, calculating a second temperature difference △ T2 between the evaporator temperature T steam and the environment temperature T ring at the end of the second time period T2, and judging whether the air conditioner is dirty or not according to the second temperature difference △ T2, wherein the second temperature difference △ T2 is the absolute value of the temperature difference between the environment temperature T ring and the evaporator temperature T steam;
it should be noted that, at the beginning of the compressor closing time, the operation of the internal fan is controlled and continues to operate for a second time period T2, a second temperature difference △ T2 between the evaporator temperature tmin and the ambient temperature T-loop is calculated at the end of the second time period T2, and whether the air conditioner is dirty or not is judged according to the second temperature difference △ T2.
Preferably, in step S1, after the air conditioner starts the compressor, it is determined whether to control the four-way reversing valve to reverse according to the ambient temperature, specifically, whether the ambient temperature is lower than a third preset temperature value, if so, the four-way reversing valve is controlled to reverse, and the air conditioner is adapted to control the refrigerant flow direction to raise the temperature of the evaporator; if not, the four-way reversing valve is controlled not to reverse, and the four-way reversing valve is suitable for controlling the flow direction of the refrigerant to reduce the temperature of the evaporator.
On the basis of the above embodiment, there is further provided a specific method for determining whether the air conditioner is dirty or not according to the second temperature difference △ T2, which is shown in fig. 4:
and calculating to obtain a second temperature difference △ T2, judging whether the second temperature difference △ T2 is greater than a second preset temperature value T2, if so, judging that the filter screen is dirty and blocked, and if not, judging that the filter screen is not dirty and blocked.
Similarly, when the compressor stops operating and the evaporator only exchanges heat with ambient air, the evaporator meets the formula Q being Cm △ T, wherein Q represents the heat exchange amount between the evaporator and the indoor air, C represents the specific heat capacity of the evaporator, and m represents the mass of the evaporator, and as the values of C, m and △ T (△ T is the first preset temperature value T1 in the embodiment) are not changed, the heat exchange amount Q between the evaporator and the indoor air is not changed, and at the moment, the longer the time for the evaporator to return to the room temperature (the first time period T1 in the embodiment), the smaller the heat exchange amount between the evaporator and the indoor air in unit time is.
At the moment when the compressor just stops operating, the heat exchange between the evaporator and the indoor air is mainly conducted by convection heat exchange, so that the instant heat exchange quantity q between the evaporator and the indoor air at the moment meets a formula q ═ hS △ T, wherein h represents the convection heat exchange coefficient of the evaporator, S represents the heat exchange area of the evaporator, △ T represents the temperature difference between the evaporator and the indoor environment at the moment when the compressor just stops operating, namely the first preset temperature value T1 in the embodiment, and the smaller q represents the smaller h as the S and △ T are unchanged.
The larger the temperature difference between the temperature recovered by the evaporator after the second time period T2 and the room temperature is, the smaller the heat exchange amount between the evaporator and the indoor air in unit time is, the smaller the instantaneous heat exchange amount q of the evaporator is, and the smaller h is, so that the change of the convective heat exchange coefficient h of the evaporator can be reflected by the temperature difference between the temperature recovered by the evaporator after the second time period T2 and the room temperature.
The dirtier filter screen is, the smaller the air volume is, the smaller h is, the smaller q is, so that the larger the second temperature difference △ T2 of the evaporator is after the second time period T2, the smaller the temperature change of the evaporator is, and the small heat exchange amount is, so that a preset temperature difference value (the second preset temperature value T2 in the embodiment) is preset, and when △ T2 is not less than T0, the filter screen is considered to be dirty and blocked, and a user needs to clean the filter screen.
It should be noted that, for different filter screens, a second temperature difference △ T2 (a difference between the evaporator temperature and the indoor temperature) after the evaporator operates for a second time period T2 under different degrees of filth blockage is measured through a pre-experiment, and a temperature difference corresponding to the degree of filth blockage to be cleaned is determined as a second preset temperature value T2.
Specifically, the present embodiment provides a specific implementation manner, as follows:
step S1, controlling the air conditioner to start the compressor, not starting the inner fan, detecting the temperature Tsteam of the environment temperature T ring and the evaporator in real time, if the environment temperature at the starting moment of the compressor is more than or equal to 19 ℃ (19 ℃ is a better implementation value of a third preset temperature value, and the value range of the third preset temperature value is 16 ℃ to 22 ℃), indicating that the environment temperature is higher, the four-way reversing valve is not reversed, and the temperature of the evaporator is gradually reduced along with the operation of the compressor; if the ambient temperature at the starting time of the compressor is lower than 19 ℃, the ambient temperature is low, the four-way reversing valve reverses, and the temperature of the evaporator gradually rises along with the operation of the compressor;
in the embodiment, the four-way reversing valve is used for reversing, for example, the ambient temperature T ring is 12 ℃, and the temperature of an evaporator is gradually reduced along with the operation of a compressor;
step S2, calculating a first temperature difference △ T1 between the ambient temperature T ring and the evaporator temperature tmin, for example, taking the first preset temperature value T1 as 10 ℃, and when the first temperature difference △ T1 is equal to the first preset temperature value T1, that is, the evaporator temperature tmin is increased to 22 ℃, turning off the compressor and controlling the operation of the internal fan;
step S3, when the compressor is turned off, the inner fan is controlled to operate for 30 seconds (30 seconds is a preferred implementation value of the second duration T2, the second duration T2 is within a range from 10 seconds to 100 seconds), a second temperature difference △ T2 between the evaporator temperature T steam and the ambient temperature T ring at the end of 30 seconds is calculated, for example, the second temperature difference △ T2 is 3 ℃, the second temperature difference △ T2 is greater than a second preset temperature value T2, and the second preset temperature value T2 takes 2 ℃ as an example, which indicates that the heat exchange between the evaporator and the ambient air is smaller than that in a normal condition, and the filter screen is dirty and blocked.
On the basis of the above embodiment, the present embodiment further provides a filth blockage degree detection method for a filter screen filth blockage detection method, including determining a filth blockage degree of an air conditioner according to a second degree section in which a second temperature difference △ T2 falls, where the second degree section includes a plurality of subintervals l1.. Lb... Ln, determining the subinterval Lb in which the second temperature difference △ T2 falls, and obtaining a filth blockage degree command corresponding to the subinterval Lb, where 1 is greater than n, the subinterval Lb corresponds to different filth degree commands, where 1 is greater than or equal to b and less than or equal to n, and the greater the value of b is, the greater the filth blockage degree command corresponding to the subinterval Lb is greater.
For example, when the second temperature difference △ T2 is calculated to be 1.5 ℃, it is determined that the second temperature difference △ T2 falls within the range defined by L2, the degree of dirty blocking corresponding to L1 is 0%, the degree of dirty blocking corresponding to L2 is 33%, the degree of dirty blocking corresponding to L3 is 66%, the degree of dirty blocking corresponding to L4 is 100%, so that the degree of dirty blocking of the filter screen at this time is 33%, and the degree of dirty blocking can be displayed by percentage number, color, or bar pattern, so as to inform the user of the degree of dirty blocking.
On the basis of the above embodiment, the present invention further provides an embodiment of a filth blockage detection device for a filter screen, including:
a detection unit for detecting an ambient temperature and an evaporator temperature;
a calculation unit for calculating a first temperature difference and a second temperature difference between the ambient temperature and the evaporator temperature;
the control unit is used for closing the compressor and controlling the operation of the inner fan when the first temperature difference is equal to a first preset temperature value;
the control unit is also used for recording a first time length from the moment when the compressor is closed to the moment when the temperature of the evaporator is equal to the ambient temperature, and judging whether the air conditioner is dirty and blocked according to the first time length; or when the compressor is closed, controlling the inner fan to operate for a second time, calculating a second temperature difference between the evaporator temperature and the ambient temperature at the end moment of the second time, and judging whether the air conditioner is dirty and blocked according to the second temperature difference.
On the basis of the foregoing embodiment, the present invention further provides an embodiment of a computer-readable storage medium, where a computer program is stored, and when the computer program is read and executed by a processor, the method for detecting dirty filter screen according to any of the foregoing embodiments is implemented.
On the basis of the foregoing embodiment, the present invention further provides an embodiment of a computer-readable storage medium, which includes a computer-readable storage medium storing a computer program and a processor, where the computer program is read by the processor and executed by the processor to implement the filter screen filth blockage detection method according to any one of the foregoing embodiments.
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 detection method for a filter screen of an air conditioner is characterized by comprising the following steps:
detecting the ambient temperature and the evaporator temperature in real time after the compressor is started;
determining a first temperature difference according to the ambient temperature and the evaporator temperature, and when the first temperature difference is equal to a first preset temperature value, closing a compressor and controlling an inner fan to operate, wherein the first temperature difference is the absolute value of the temperature difference between the ambient temperature and the evaporator temperature;
recording a first time length from the moment when the compressor is closed to the moment when the temperature of the evaporator is equal to the ambient temperature, and judging whether the filter screen is dirty and blocked according to the first time length; or when the compressor is closed, controlling the inner fan to operate for a second time, determining a second temperature difference according to the evaporator temperature and the ambient temperature at the end time of the second time, and judging whether the filter screen is dirty or not according to the second temperature difference, wherein the second temperature difference is the absolute value of the temperature difference between the ambient temperature and the evaporator temperature.
2. The method for detecting filth blockage of a filter screen of an air conditioner as claimed in claim 1, wherein the determining whether the filter screen is filth-blocked according to the first time period comprises:
judging whether the first time length is greater than or equal to a preset time length, if so, judging that the filter screen is dirty and blocked; if not, the filter screen is judged to be not dirty and blocked.
3. The method for detecting filth blockage of a filter screen of an air conditioner as claimed in claim 1, wherein said determining whether the filter screen is filth-blocked according to the second temperature difference comprises:
judging whether the second temperature difference is larger than a second preset temperature value or not, and if so, judging that the filter screen is dirty and blocked; if not, the filter screen is judged to be not dirty and blocked.
4. A filth clogging detecting method for a filter screen of an air conditioner according to any one of claims 1 to 3, further comprising:
and after the compressor is started, judging whether to control the four-way reversing valve to reverse or not according to the ambient temperature.
5. The method for detecting filth blockage of a filter screen of an air conditioner as claimed in claim 4, wherein the judging whether to control the four-way reversing valve to reverse according to the environmental temperature comprises:
judging whether the ambient temperature is lower than a third preset temperature value or not, if so, controlling the four-way reversing valve to reverse, and being suitable for controlling the flow direction of a refrigerant to increase the temperature of the evaporator; if not, the four-way reversing valve is controlled not to reverse, and the four-way reversing valve is suitable for controlling the flow direction of the refrigerant to reduce the temperature of the evaporator.
6. The method for detecting filth blockage of a filter screen of an air conditioner as claimed in claim 1, further comprising:
judging the filth blockage degree of the filter screen according to a first degree interval in which the first time length falls, wherein the first degree interval comprises a plurality of subintervals K1... Ka... Ke, determining the subinterval Ka in which the first time length falls, and acquiring a filth blockage degree command corresponding to the subinterval Ka;
and a is more than or equal to 1 and less than or equal to e, the subinterval Ka corresponds to different dirty degree commands, and the larger the value of a is, the larger the dirty degree corresponding to the dirty degree command of the subinterval Ka is.
7. The method for detecting filth blockage of a filter screen of an air conditioner as claimed in claim 1, further comprising:
judging the dirty blockage degree of the filter screen according to a second degree interval in which the second temperature difference falls, wherein the second degree interval comprises a plurality of subintervals L1.. Lb... Ln, determining the subinterval Lb in which the second temperature falls, and acquiring a dirty blockage degree command corresponding to the subinterval Lb;
b is more than or equal to 1 and less than or equal to n, the subinterval Lb corresponds to different dirty degree commands, and the larger the value of b is, the larger the dirty degree corresponding to the dirty degree command of the subinterval Lb is.
8. The utility model provides an air conditioner filter screen filth blocks up detection device which characterized in that includes:
a detection unit for detecting an ambient temperature and an evaporator temperature;
a calculation unit for calculating a first temperature difference and a second temperature difference between the ambient temperature and the evaporator temperature;
the control unit is used for closing the compressor and controlling the operation of the inner fan when the first temperature difference is equal to a first preset temperature value;
the control unit is also used for recording a first time length from the moment when the compressor is closed to the moment when the temperature of the evaporator is equal to the ambient temperature, and judging whether the air conditioner is dirty and blocked according to the first time length; or when the compressor is closed, controlling the inner fan to operate for a second time, calculating a second temperature difference between the evaporator temperature and the ambient temperature at the end moment of the second time, and judging whether the air conditioner is dirty and blocked according to the second temperature difference.
9. A computer-readable storage medium, characterized in that the computer-readable storage medium stores a computer program, which is read and executed by a processor, and which implements the filter screen fouling detection method according to any one of claims 1-7.
10. An air conditioner comprising a computer readable storage medium storing a computer program and a processor, wherein the computer program is read by the processor and executed to implement the filter screen fouling detection method according to any one of claims 1 to 7.
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111594980A (en) * | 2020-06-02 | 2020-08-28 | 宁波奥克斯电气股份有限公司 | Air conditioner filth blockage judging method and device, medium and air conditioner |
| CN111649450A (en) * | 2020-05-22 | 2020-09-11 | 宁波奥克斯电气股份有限公司 | Filter screen dust removal reminding method and device and air conditioner |
| CN113654188A (en) * | 2021-08-13 | 2021-11-16 | 珠海格力电器股份有限公司 | Air conditioner control method |
| CN114087714A (en) * | 2021-11-10 | 2022-02-25 | 珠海格力电器股份有限公司 | Air conditioner filter screen filth blockage detection method and device and air conditioner |
| CN115751608A (en) * | 2022-11-11 | 2023-03-07 | 宁波奥克斯电气股份有限公司 | Filth blockage detection method and device for air conditioner indoor unit and air conditioner |
| CN116045452A (en) * | 2023-01-06 | 2023-05-02 | 宁波奥克斯电气股份有限公司 | Method and system for detecting filth blockage of filter screen of air conditioner |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009192096A (en) * | 2008-02-12 | 2009-08-27 | Mitsubishi Electric Corp | Air conditioner |
| CN107228424A (en) * | 2016-07-30 | 2017-10-03 | 徐宝安 | A kind of condenser cooling wind evaporation moistening and lowering temperature synergy air conditioner |
| CN108050650A (en) * | 2017-11-23 | 2018-05-18 | 广东美的制冷设备有限公司 | The dirty stifled detection method of air-conditioning, device and computer readable storage medium |
| CN108489030A (en) * | 2018-03-07 | 2018-09-04 | 广东美的制冷设备有限公司 | The self-cleaning control method of A/C evaporator, device, air conditioner and storage medium |
| CN109269014A (en) * | 2018-09-30 | 2019-01-25 | 中车青岛四方机车车辆股份有限公司 | A kind of air conditioner filter screen condition detection method, detection system and rail vehicle |
| CN109373505A (en) * | 2018-10-26 | 2019-02-22 | 奥克斯空调股份有限公司 | A kind of air-conditioning cleaning prompting control method and air conditioner |
| CN110207269A (en) * | 2019-05-31 | 2019-09-06 | 广东志高暖通设备股份有限公司 | Electricity auxiliary heating air-conditioner host and its control method |
| CN110608509A (en) * | 2019-10-08 | 2019-12-24 | 宁波奥克斯电气股份有限公司 | Filter screen filth blockage detection method and device, air conditioner and storage medium |
-
2019
- 2019-12-31 CN CN201911412498.1A patent/CN111043711A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009192096A (en) * | 2008-02-12 | 2009-08-27 | Mitsubishi Electric Corp | Air conditioner |
| CN107228424A (en) * | 2016-07-30 | 2017-10-03 | 徐宝安 | A kind of condenser cooling wind evaporation moistening and lowering temperature synergy air conditioner |
| CN108050650A (en) * | 2017-11-23 | 2018-05-18 | 广东美的制冷设备有限公司 | The dirty stifled detection method of air-conditioning, device and computer readable storage medium |
| CN108489030A (en) * | 2018-03-07 | 2018-09-04 | 广东美的制冷设备有限公司 | The self-cleaning control method of A/C evaporator, device, air conditioner and storage medium |
| CN109269014A (en) * | 2018-09-30 | 2019-01-25 | 中车青岛四方机车车辆股份有限公司 | A kind of air conditioner filter screen condition detection method, detection system and rail vehicle |
| CN109373505A (en) * | 2018-10-26 | 2019-02-22 | 奥克斯空调股份有限公司 | A kind of air-conditioning cleaning prompting control method and air conditioner |
| CN110207269A (en) * | 2019-05-31 | 2019-09-06 | 广东志高暖通设备股份有限公司 | Electricity auxiliary heating air-conditioner host and its control method |
| CN110608509A (en) * | 2019-10-08 | 2019-12-24 | 宁波奥克斯电气股份有限公司 | Filter screen filth blockage detection method and device, air conditioner and storage medium |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111649450A (en) * | 2020-05-22 | 2020-09-11 | 宁波奥克斯电气股份有限公司 | Filter screen dust removal reminding method and device and air conditioner |
| CN111594980A (en) * | 2020-06-02 | 2020-08-28 | 宁波奥克斯电气股份有限公司 | Air conditioner filth blockage judging method and device, medium and air conditioner |
| CN113654188A (en) * | 2021-08-13 | 2021-11-16 | 珠海格力电器股份有限公司 | Air conditioner control method |
| CN114087714A (en) * | 2021-11-10 | 2022-02-25 | 珠海格力电器股份有限公司 | Air conditioner filter screen filth blockage detection method and device and air conditioner |
| CN114087714B (en) * | 2021-11-10 | 2022-11-01 | 珠海格力电器股份有限公司 | Air conditioner filter screen filth blockage detection method and device and air conditioner |
| CN115751608A (en) * | 2022-11-11 | 2023-03-07 | 宁波奥克斯电气股份有限公司 | Filth blockage detection method and device for air conditioner indoor unit and air conditioner |
| CN116045452A (en) * | 2023-01-06 | 2023-05-02 | 宁波奥克斯电气股份有限公司 | Method and system for detecting filth blockage of filter screen of air conditioner |
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Application publication date: 20200421 |